nova api 分析
2024-06-01 12:08:57
0. 总览
nova的服务在功能上主要分为应用层和逻辑层两类，nova-api就是应用层的服务，而nova-scheduler、nova-conductor等则是逻辑层服务。本文主要通过注释的方式讲述nova-api服务的启动流程。
首先看一下main函数，之后针对几个重要的部分简单跟踪一下。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/cmd/api.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">main</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 加载命令行传入的参数，设置数据库和RPC，argv是服务启动命令的参数列表，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ['/usr/local/bin/nova-api', '--config-file', '/etc/nova/nova.conf']</span>config.parse_args(sys.argv)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 直接调用oslo_log.log设置服务的日志文件</span>logging.setup(CONF, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"nova"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 打补丁的方式导入模块，但默认不开启</span>utils.monkey_patch()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 其实就是import objects模块的各个object，在RPC接收时用到</span>objects.register_all()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 根据wiki的解释，应用于admin了解系统运行细节，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 通过信号量的方式进行触发，可生成极为详细的运行报告</span>gmr.TextGuruMeditation.setup_autorun(version)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建一个ProcessLauncher对象，也就是服务启动器</span>launcher = service.process_launcher()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建api，我的默认配置是enabled_apis = osapi_compute,metadata</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> api <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> CONF.enabled_apis:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 默认都不使用ssl</span>should_use_ssl = api <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> CONF.enabled_ssl_apis、<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建相应api的WSGIService对象</span>server = service.WSGIService(api, use_ssl=should_use_ssl)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 启动相应api的服务</span>launcher.launch_service(server, workers=server.workers <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 监控api服务的worker，不正常结束就reset；接收到终止的信号量就kill workers</span>launcher.wait()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li></ul>
以下是本文涉及到的一些文件目录
1. 解析命令行参数
主要是设置默认的配置，其中最主要的是RPC的设置和初始化，我的环境的默认driver是rabbitmq。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/config.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">parse_args</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(argv, default_config_files=None, configure_db=True,init_rpc=True)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 设置oslo_log使用的默认选项</span>log.set_defaults(_DEFAULT_LOGGING_CONTEXT_FORMAT, _DEFAULT_LOG_LEVELS)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 注册命令行和配置选项</span>log.register_options(CONF)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 设置DB相关的默认选项</span>options.set_defaults(CONF, connection=_DEFAULT_SQL_CONNECTION,sqlite_db=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova.sqlite'</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 设置RPC的默认选项，设置默认exchange为nova</span>rpc.set_defaults(control_exchange=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova'</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ===== 这三个默认配置并不是很懂，之后看懂了补上 =====</span>cache.configure(CONF)debugger.register_cli_opts()config.set_middleware_defaults()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ====================================================</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 解析命令行参数和配置文件</span>CONF(argv[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>:],project=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova'</span>,version=version.version_string(),default_config_files=default_config_files)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 初始化RPC。之前都是些默认配置，RPC的初始化过程稍微复杂一些，涉及stevedore模块，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 主要涉及几个对象：TRANSPORT, NOTIFICATION_TRANSPORT, LEGACY_NOTIFIER, NOTIFIER</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> init_rpc:rpc.init(CONF)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 配置sqlalchemy api</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> configure_db:sqlalchemy_api.configure(CONF)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li></ul>
2. Guru Meditation Reports
这个模块主要是进行对系统操作的监控，这里可以看一看wiki里的一个展示看一下效果。
如果有兴趣可以看一下wiki的详细解释 Guru Meditation Reports
<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">======================================================================== ==== Guru meditation report ==== ======================================================================== UUID: 6d4faf99-480c-4d0c-90be-b7d090ecd83e Time: Mon, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">18</span> Feb <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2013</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">18</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">01</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">11</span> +<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0000</span> ======================================================================== ==== Config ==== ======================================================================== DEFAULT:allow_resize_to_same_host=Trueallow_same_net_traffic=Trueallowed_direct_url_schemes=[]allowed_rpc_exception_modules=[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova.openstack.common.exception'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova.exception'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'cinder.exception'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'exceptions'</span>]api_paste_config=/etc/nova/api-paste.iniapi_rate_limit=Trueauth_strategy=keystoneauto_assign_floating_ip=Falsebackdoor_port=Nonebandwidth_poll_interval=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">600</span>base_dir_name=_basebindir=/home/berrange/src/cloud/nova/bin<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span>Thread ID <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">177</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">switch</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self.greenlet.switch()/usr/lib/python2.7/site-packages/eventlet/greenthread.py:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">30</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> sleephub.switch()/home/berrange/src/cloud/nova/nova/utils.py:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">596</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> _innergreenthread.sleep(interval)/usr/lib/python2.7/site-packages/eventlet/greenthread.py:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">192</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> mainresult = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span>(*args, **kwargs) ======================================================================== ==== Package ==== ======================================================================== Vendor: OpenStack Foundation Product: OpenStack Nova Version: <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2013.1</span> ========================================================================</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li></ul>
3. 创建服务启动器
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/service.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">process_launcher</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> service.ProcessLauncher(CONF)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>
可以简单看一下ProcessLauncher的初始化，这个类有点意思，之后的操作会详细使用这个类。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_service/service.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ProcessLauncher</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Launch a service with a given number of workers."""</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, conf, wait_interval=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.01</span>)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Constructor.:param conf: an instance of ConfigOpts:param wait_interval: The interval to sleep for between checksof child process exit."""</span>self.conf = confconf.register_opts(_options.service_opts)self.children = {}self.sigcaught = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>self.running = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>self.wait_interval = wait_intervalself.launcher = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>rfd, self.writepipe = os.pipe()self.readpipe = eventlet.greenio.GreenPipe(rfd, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'r'</span>)self.signal_handler = SignalHandler()self.handle_signal()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li></ul>
4. 创建api的WSGIService对象
这边以osapi_compute为例进行跟踪。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/service.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">WSGIService</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(service.Service)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Provides ability to launch API from a 'paste' configuration."""</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># name = 'osapi_compute'</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, name, loader=None, use_ssl=False, max_url_len=None)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Initialize, but do not start the WSGI server.:param name: The name of the WSGI server given to the loader.:param loader: Loads the WSGI application using the given name.:returns: None"""</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># name = 'osapi_compute'</span>self.name = name<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># NOTE(danms): Name can be metadata, os_compute, or ec2, per</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova.service's enabled_apis</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># binary = 'nova-osapi_compute'</span>self.binary = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova-%s'</span> % nameself.topic = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># manager = None，这一个值只有在metadata是会有，这是在conf中配置的</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ===== 暂时还没深入看，之后看完再补上 =====</span>self.manager = self._get_manager()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ==========================================</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 接下来2步加载app，app的信息在"/etc/nova/api-paste.ini"，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># loader = <nova.wsgi.Loader object at 0x7f6f2b5b1ed0></span>self.loader = loader <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> wsgi.Loader()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app = <nova.api.openstack.urlmap.URLMap object at 0x7f6f2b541790></span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 这边主要返回一个URLMap对象，从名字上就知道是用来根据url路由到app</span>self.app = self.loader.load_app(name)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># inherit all compute_api worker counts from osapi_compute</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> name.startswith(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'openstack_compute_api'</span>):wname = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'osapi_compute'</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># wname = 'osapi_compute'</span>wname = name<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 设置监听的主机，host = '0.0.0.0'</span>self.host = getattr(CONF, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'%s_listen'</span> % name, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"0.0.0.0"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 设置监听端口，port = 8774</span>self.port = getattr(CONF, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'%s_listen_port'</span> % name, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 子进程的个数，workers = 2，因为我的环境是2核</span>self.workers = (getattr(CONF, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'%s_workers'</span> % wname, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span>processutils.get_worker_count())<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self.workers <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> self.workers < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>:worker_name = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'%s_workers'</span> % namemsg = (_(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%(worker_name)s value of %(workers)s is invalid, "</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"must be greater than 0"</span>) %{<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'worker_name'</span>: worker_name,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'workers'</span>: str(self.workers)})<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> exception.InvalidInput(msg)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 默认不使用ssl，use_ssl = False</span>self.use_ssl = use_ssl<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># server = <nova.wsgi.Server object at 0x7f6f38530d90></span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建一个wsgi Server的对象</span>self.server = wsgi.Server(name,self.app,host=self.host,port=self.port,use_ssl=self.use_ssl,max_url_len=max_url_len)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Pull back actual port used</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># port = 8774</span>self.port = self.server.portself.backdoor_port = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li></ul>
4.1 加载app
这边其实是直接调用paste.deploy.loadapp进行加载，关于loadapp，之后的文章再进行简单的描述。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/wsgi.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Loader</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Used to load WSGI applications from paste configurations."""</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, config_path=None)</span>:</span>self.config_path = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># config_path = '/etc/nova/api-paste.ini'</span>config_path = config_path <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> CONF.api_paste_config<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> os.path.isabs(config_path):self.config_path = CONF.find_file(config_path)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">elif</span> os.path.exists(config_path):self.config_path = config_path<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> self.config_path:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> exception.ConfigNotFound(path=config_path)<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">load_app</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, name)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Return the paste URLMap wrapped WSGI application.:param name: Name of the application to load.:returns: Paste URLMap object wrapping the requested application.:raises: `nova.exception.PasteAppNotFound`"""</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 可以发现是直接调用paste.deploy.loadapp方法</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:LOG.debug(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Loading app %(name)s from %(path)s"</span>,{<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'name'</span>: name, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'path'</span>: self.config_path})<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> deploy.loadapp(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"config:%s"</span> % self.config_path, name=name)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> LookupError:LOG.exception(_LE(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Couldn't lookup app: %s"</span>), name)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> exception.PasteAppNotFound(name=name, path=self.config_path)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li></ul>
4.2 创建wsgi Server的对象
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/wsgi.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Server</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(service.ServiceBase)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Server class to manage a WSGI server, serving a WSGI application."""</span>default_pool_size = CONF.wsgi_default_pool_size<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, name, app, host=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'0.0.0.0'</span>, port=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, pool_size=None,protocol=eventlet.wsgi.HttpProtocol, backlog=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">128</span>,use_ssl=False, max_url_len=None)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Initialize, but do not start, a WSGI server."""</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Allow operators to customize http requests max header line size.</span>eventlet.wsgi.MAX_HEADER_LINE = CONF.max_header_line<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># name = 'osapi_compute'</span>self.name = name<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app = <nova.api.openstack.urlmap.URLMap object at 0x7f7a715b1550></span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 就是之前load到的app</span>self.app = appself._server = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 接下来是eventlet的相关设置，详细原理参见之前的文章</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _protocol = eventlet.wsgi.HttpProtocol</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 选择HTTP协议</span>self._protocol = protocol<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 绿色线程池大小pool_size = 1000</span>self.pool_size = pool_size <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> self.default_pool_size<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建一个绿色线程池_pool = <eventlet.greenpool.GreenPool object at 0x7f7a72852550></span>self._pool = eventlet.GreenPool(self.pool_size)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _logger = <oslo_log.log.KeywordArgumentAdapter object at 0x7f7a6b410790></span>self._logger = logging.getLogger(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"nova.%s.wsgi.server"</span> % self.name)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _use_ssl = False</span>self._use_ssl = use_ssl<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _max_url_len = None</span>self._max_url_len = max_url_len<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 设置超时时间，client_socket_timeout = 900</span>self.client_socket_timeout = CONF.client_socket_timeout <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> backlog < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> exception.InvalidInput(reason=_(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'The backlog must be more than 0'</span>))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># bind_adrr = ('0.0.0.0', 8774)</span>bind_addr = (host, port)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># info = (2, 1, 6, '', ('0.0.0.0', 8774))</span>info = socket.getaddrinfo(bind_addr[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>],bind_addr[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>],socket.AF_UNSPEC,socket.SOCK_STREAM)[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>]family = info[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>]bind_addr = info[-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>]<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> Exception:family = socket.AF_INET<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _socket = <eventlet.greenio.base.GreenSocket object at 0x7f7a6b410810></span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建绿色线程的socket</span>self._socket = eventlet.listen(bind_addr, family, backlog=backlog)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> EnvironmentError:LOG.error(_LE(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Could not bind to %(host)s:%(port)s"</span>),{<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'host'</span>: host, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'port'</span>: port})<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># host = '0.0.0.0', port = 8774</span>(self.host, self.port) = self._socket.getsockname()[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>]LOG.info(_LI(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%(name)s listening on %(host)s:%(port)s"</span>),{<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'name'</span>: self.name, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'host'</span>: self.host, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'port'</span>: self.port})</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li></ul>
5 启动api服务
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_service/service.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">launch_service</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, service, workers=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># service类型检查</span>_check_service_base(service)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 把参数包装成ServiceWrapper对象，类似结构体</span>wrap = ServiceWrapper(service, workers)LOG.info(_LI(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Starting %d workers'</span>), wrap.workers)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建workers个子进程</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> self.running <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> len(wrap.children) < wrap.workers:self._start_child(wrap)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>
接下来看看创建子进程的代码。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_service/service.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_start_child</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, wrap)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> len(wrap.forktimes) > wrap.workers:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Limit ourselves to one process a second (over the period of</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># number of workers * 1 second). This will allow workers to</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># start up quickly but ensure we don't fork off children that</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># die instantly too quickly.</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> time.time() - wrap.forktimes[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>] < wrap.workers:LOG.info(_LI(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Forking too fast, sleeping'</span>))time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)wrap.forktimes.pop(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 把当前时间加入列表</span>wrap.forktimes.append(time.time())<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># fork一个子进程，子进程的pid = 0，父进程的pid > 0</span>pid = os.fork()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 当前进程为子进程时执行以下代码</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> pid == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># =============== 子进程操作 ===============</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建并运行子线程（绿色线程）</span>self.launcher = self._child_process(wrap.service)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 循环等待信号量，如果接收到终止命令则kill子进程</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>:self._child_process_handle_signal()status, signo = self._child_wait_for_exit_or_signal(self.launcher)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> _is_sighup_and_daemon(signo):self.launcher.wait()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>self.launcher.restart()os._exit(status)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ==========================================</span>LOG.debug(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Started child %d'</span>, pid)wrap.children.add(pid)self.children[pid] = wrap<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> pid</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_service/service.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_child_process</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, service)</span>:</span>self._child_process_handle_signal()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Reopen the eventlet hub to make sure we don't share an epoll</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># fd with parent and/or siblings, which would be bad</span>eventlet.hubs.use_hub()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Close write to ensure only parent has it open</span>os.close(self.writepipe)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Create greenthread to watch for parent to close pipe</span>eventlet.spawn_n(self._pipe_watcher)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Reseed random number generator</span>random.seed()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建一个服务启动器</span>launcher = Launcher(self.conf)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 启动服务</span>launcher.launch_service(service)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> launcher</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_service/service.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Launcher</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">launch_service</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, service)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 检查service类型</span>_check_service_base(service)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 设置后门端口，用于创建backdoor_server来监控进程</span>service.backdoor_port = self.backdoor_port<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 运行服务</span>self.services.add(service)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_service/service.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Services</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">add</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, service)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 服务加入列表</span>self.services.append(service)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 在线程池中创建一个绿色线程</span>self.tg.add_thread(self.run_service, service, self.done)<span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@staticmethod</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">run_service</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(service, done)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Service start wrapper.:param service: service to run:param done: event to wait on until a shutdown is triggered:returns: None"""</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:service.start() <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 开始服务</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> Exception:LOG.exception(_LE(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Error starting thread.'</span>))<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> SystemExit(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:done.wait()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li></ul>
之后我们可以看一下service.start()的跟踪。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/service.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">WSGIService</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(service.Service)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">start</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self)</span>:</span>... ...... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 关于这边的manager，之前也有提到过，默认只有metadata有，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 只有看这边的调用就可看出它其实是提供了一些hook，不过具体作用我还没有深入看，之后看完了再补上</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self.manager:self.manager.init_host()self.manager.pre_start_hook()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self.backdoor_port <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>:self.manager.backdoor_port = self.backdoor_port<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 开启服务</span>self.server.start()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self.manager:self.manager.post_start_hook()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/wsgi.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Server</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(service.ServiceBase)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">start</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Start serving a WSGI application."""</span>... ...... ...wsgi_kwargs = {<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'func'</span>: eventlet.wsgi.server, <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建http服务的eventlet方法</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'sock'</span>: dup_socket, <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># socket（eventlet_listen）</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'site'</span>: self.app, <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 应用服务</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'protocol'</span>: self._protocol, <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># eventlet.wsgi.HttpProtocol</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'custom_pool'</span>: self._pool, <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 绿色线程池</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'log'</span>: self._logger,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'log_format'</span>: CONF.wsgi_log_format,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'debug'</span>: <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">False</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'keepalive'</span>: CONF.wsgi_keep_alive,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'socket_timeout'</span>: self.client_socket_timeout}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self._max_url_len:wsgi_kwargs[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'url_length_limit'</span>] = self._max_url_len<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 调用utils的spawn进行创建</span>self._server = utils.spawn(**wsgi_kwargs)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/utils.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">spawn</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(func, *args, **kwargs)</span>:</span>_context = common_context.get_current()<span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@functools.wraps(func)</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">context_wrapper</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(*args, **kwargs)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># NOTE: If update_store is not called after spawn it won't be</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># available for the logger to pull from threadlocal storage.</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> _context <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>:_context.update_store()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> func(*args, **kwargs)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 可见是直接调用eventlet的spawn方法进行创建</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> eventlet.spawn(context_wrapper, *args, **kwargs)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul>
服务启动之后
之后可以看一下日志文件的输出，可以见到2个服务分别开启了2个子进程workers
6. 监听服务
循环等待子进程终止进程的信号量或者重启已经挂了的worker。
对于信号量这一块我还不是很清楚，没有深入了解其代码，所以在这边挖个坑等以后填上。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_service/service.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ProcessLauncher</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">wait</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Loop waiting on children to die and respawning as necessary."""</span>systemd.notify_once()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self.conf.log_options:LOG.debug(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Full set of CONF:'</span>)self.conf.log_opt_values(LOG, logging.DEBUG)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>:self.handle_signal()self._respawn_children()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># No signal means that stop was called. Don't clean up here.</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> self.sigcaught:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span>signame = self.signal_handler.signals_to_name[self.sigcaught]LOG.info(_LI(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Caught %s, stopping children'</span>), signame)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> _is_sighup_and_daemon(self.sigcaught):<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>self.conf.reload_config_files()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> service <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> set([wrap.service <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> wrap <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> self.children.values()]):service.reset()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> pid <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> self.children:os.kill(pid, signal.SIGTERM)self.running = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>self.sigcaught = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> eventlet.greenlet.GreenletExit:LOG.info(_LI(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Wait called after thread killed. Cleaning up."</span>))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># if we are here it means that we are trying to do graceful shutdown.</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># add alarm watching that graceful_shutdown_timeout is not exceeded</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (self.conf.graceful_shutdown_timeout <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span>self.signal_handler.is_signal_supported(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'SIGALRM'</span>)):signal.alarm(self.conf.graceful_shutdown_timeout)</code><p><code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> self.stop()</code><code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"></code></p><p style="margin-top: 0px; margin-bottom: 1.1em; padding-top: 0px; padding-bottom: 0px; box-sizing: border-box; font-family: 'microsoft yahei'; font-size: 14px; line-height: 26px;">之前的文章中已经分析了nova-api的整体启动流程，但是其中一些重要的细节并没有深入看，今天这篇文章主要看一下nova-api中的loadapp的过程。至于URLMap、APIRouter以及各个Filter的功能流程之后在解析http请求的时候会做一下分析。 <br style="box-sizing: border-box;" />接下来还是直接看一下代码。</p><pre class="prettyprint" name="code" style="white-space: nowrap; word-wrap: break-word; box-sizing: border-box; margin-top: 0px; margin-bottom: 1.1em; font-family: 'Source Code Pro', monospace; padding: 5px 5px 5px 60px; font-size: 14px; line-height: 1.45; word-break: break-all; color: rgb(51, 51, 51); border: 1px solid rgba(128, 128, 128, 0.0745098); border-radius: 0px; position: relative; overflow-y: hidden; overflow-x: auto; background-color: rgba(128, 128, 128, 0.0470588);"><code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/service.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">WSGIService</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(service.Service)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, name, loader=None, use_ssl=False, max_url_len=None)</span>:</span>... ...... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 接下来2步加载app，app的信息在"/etc/nova/api-paste.ini"，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># loader = <nova.wsgi.Loader object at 0x7f6f2b5b1ed0></span>self.loader = loader <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> wsgi.Loader()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app = <nova.api.openstack.urlmap.URLMap object at 0x7f6f2b541790></span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 这边主要返回一个URLMap对象，从名字上就知道是用来根据url路由到app</span>self.app = self.loader.load_app(name)... ...... ...</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>
加载app代码跟踪
这边简单跟踪一下整体的代码调用过程，不做细节的介绍。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/wsgi.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Loader</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span>... ...<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">load_app</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, name)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:LOG.debug(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Loading app %(name)s from %(path)s"</span>,{<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'name'</span>: name, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'path'</span>: self.config_path})<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># deploy.loadapp("config:'/etc/nova/api-paste.ini'", name='osapi_compute')</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> deploy.loadapp(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"config:%s"</span> % self.config_path, name=name)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> LookupError:LOG.exception(_LE(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Couldn't lookup app: %s"</span>), name)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> exception.PasteAppNotFound(name=name, path=self.config_path)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul>
之后的流程就开始在paste.deploy中执行。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># paste/deploy/loadwsgi.py</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># uri = 'config:/etc/nova/api-paste.ini'</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># name = 'osapi_compute'</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># kw = {}</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># APP = _App()</span>
<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">loadapp</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(uri, name=None, **kw)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> loadobj(APP, uri, name=name, **kw)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">loadobj</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object_type, uri, name=None, relative_to=None,global_conf=None)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># object_type = <application protocols=[['paste.app_factory'], ['paste.composite_factory'], ['paste.composit_factory']] prefixes=[['app', 'application'], ['composite', 'composit'], ['pipeline'], ['filter-app']]></span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># uri = 'config:/etc/nova/api-paste.ini'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># name = 'osapi_compute'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># relative_to = None</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># global_conf = None</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 这一个过程十分漫长</span>context = loadcontext(object_type, uri, name=name, relative_to=relative_to,global_conf=global_conf)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> context.create()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">loadcontext</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object_type, uri, name=None, relative_to=None,global_conf=None)</span>:</span>... ...... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># scheme = 'config'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _loaders['config'] = _loadconfig</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> _loaders[scheme](object_type,uri, path, name=name, relative_to=relative_to,global_conf=global_conf)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_loadconfig</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object_type, uri, path, name, relative_to,global_conf)</span>:</span>... ...... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># path = '/etc/nova/api-paste.ini'</span>path = unquote(path)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># loader = <paste.deploy.loadwsgi.ConfigLoader object at 0x7fe4c77f2e50></span>loader = ConfigLoader(path)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> global_conf:loader.update_defaults(global_conf, overwrite=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">False</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> loader.get_context(object_type, name, global_conf)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ConfigLoader</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(_Loader)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, filename)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># filename = '/etc/nova/api-paste.ini'</span>self.filename = filename = filename.strip()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># defaults = {'__file__': '/etc/nova/api-paste.ini', 'here': '/etc/nova'}</span>defaults = {<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'here'</span>: os.path.dirname(os.path.abspath(filename)),<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'__file__'</span>: os.path.abspath(filename)}self.parser = NicerConfigParser(filename, defaults=defaults)self.parser.optionxform = str <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Don't lower-case keys</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> open(filename) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> f:self.parser.read_file(f)<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">get_context</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, object_type, name=None, global_conf=None)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self.absolute_name(name):<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> loadcontext(object_type, name,relative_to=os.path.dirname(self.filename),global_conf=global_conf)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># section = 'composite:osapi_compute'</span>section = self.find_config_section(object_type, name=name)... ...... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 循环读取section成local_conf和global_conf</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> option <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> self.parser.options(section):<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> option.startswith(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'set '</span>):name = option[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>:].strip()global_additions[name] = global_conf[name] = (self.parser.get(section, option))<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">elif</span> option.startswith(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'get '</span>):name = option[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>:].strip()get_from_globals[name] = self.parser.get(section, option)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> option <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> defaults:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">continue</span>local_conf[option] = self.parser.get(section, option)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># local_conf = {'/v2': 'openstack_compute_api_v21_legacy_v2_compatible', '/v2.1': 'openstack_compute_api_v21', 'use': 'call:nova.api.openstack.urlmap:urlmap_factory', '/': 'oscomputeversions'}</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># global_conf = {'__file__': '/etc/nova/api-paste.ini', 'here': '/etc/nova'}</span>... ...... ...<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> section.startswith(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'filter-app:'</span>):context = self._filter_app_context(object_type, section, name=name,global_conf=global_conf, local_conf=local_conf,global_additions=global_additions)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">elif</span> section.startswith(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'pipeline:'</span>):context = self._pipeline_app_context(object_type, section, name=name,global_conf=global_conf, local_conf=local_conf,global_additions=global_additions)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">elif</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'use'</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> local_conf:context = self._context_from_use(object_type, local_conf, global_conf, global_additions,section)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:context = self._context_from_explicit(object_type, local_conf, global_conf, global_additions,section)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> filter_with <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>:filter_with_context = LoaderContext(obj=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>,object_type=FILTER_WITH,protocol=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>,global_conf=global_conf, local_conf=local_conf,loader=self)filter_with_context.filter_context = self.filter_context(name=filter_with, global_conf=global_conf)filter_with_context.next_context = context<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> filter_with_context<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> context<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_context_from_use</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, object_type, local_conf, global_conf,global_additions, section)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 这边真正取到urlmap_factory</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># use = 'call:nova.api.openstack.urlmap:urlmap_factory'</span>use = local_conf.pop(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'use'</span>)context = self.get_context(object_type, name=use, global_conf=global_conf)context.global_conf.update(global_additions)context.local_conf.update(local_conf)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'__file__'</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> global_conf:context.global_conf[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'__file__'</span>] = global_conf[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'__file__'</span>]context.loader = self<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> context.protocol <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>:section_protocol = section.split(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">':'</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>]<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> section_protocol <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> (<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'application'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'app'</span>):context.protocol = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.app_factory'</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">elif</span> section_protocol <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> (<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'composit'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'composite'</span>):context.protocol = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.composit_factory'</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:context.protocol = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.%s_factory'</span> % section_protocol<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> context</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li><li style="box-sizing: border-box; padding: 0px 5px;">79</li><li style="box-sizing: border-box; padding: 0px 5px;">80</li><li style="box-sizing: border-box; padding: 0px 5px;">81</li><li style="box-sizing: border-box; padding: 0px 5px;">82</li><li style="box-sizing: border-box; padding: 0px 5px;">83</li><li style="box-sizing: border-box; padding: 0px 5px;">84</li><li style="box-sizing: border-box; padding: 0px 5px;">85</li><li style="box-sizing: border-box; padding: 0px 5px;">86</li><li style="box-sizing: border-box; padding: 0px 5px;">87</li><li style="box-sizing: border-box; padding: 0px 5px;">88</li><li style="box-sizing: border-box; padding: 0px 5px;">89</li><li style="box-sizing: border-box; padding: 0px 5px;">90</li><li style="box-sizing: border-box; padding: 0px 5px;">91</li><li style="box-sizing: border-box; padding: 0px 5px;">92</li><li style="box-sizing: border-box; padding: 0px 5px;">93</li><li style="box-sizing: border-box; padding: 0px 5px;">94</li><li style="box-sizing: border-box; padding: 0px 5px;">95</li><li style="box-sizing: border-box; padding: 0px 5px;">96</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li><li style="box-sizing: border-box; padding: 0px 5px;">79</li><li style="box-sizing: border-box; padding: 0px 5px;">80</li><li style="box-sizing: border-box; padding: 0px 5px;">81</li><li style="box-sizing: border-box; padding: 0px 5px;">82</li><li style="box-sizing: border-box; padding: 0px 5px;">83</li><li style="box-sizing: border-box; padding: 0px 5px;">84</li><li style="box-sizing: border-box; padding: 0px 5px;">85</li><li style="box-sizing: border-box; padding: 0px 5px;">86</li><li style="box-sizing: border-box; padding: 0px 5px;">87</li><li style="box-sizing: border-box; padding: 0px 5px;">88</li><li style="box-sizing: border-box; padding: 0px 5px;">89</li><li style="box-sizing: border-box; padding: 0px 5px;">90</li><li style="box-sizing: border-box; padding: 0px 5px;">91</li><li style="box-sizing: border-box; padding: 0px 5px;">92</li><li style="box-sizing: border-box; padding: 0px 5px;">93</li><li style="box-sizing: border-box; padding: 0px 5px;">94</li><li style="box-sizing: border-box; padding: 0px 5px;">95</li><li style="box-sizing: border-box; padding: 0px 5px;">96</li></ul>
之后又调用回loadcontext方法。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">loadcontext</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object_type, uri, name=None, relative_to=None,global_conf=None)</span>:</span>... ...... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 此处开始加载urlmap的步骤</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># scheme = 'call'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _loaders['call'] = _loadfunc</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> _loaders[scheme](object_type,uri, path, name=name, relative_to=relative_to,global_conf=global_conf)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_loadfunc</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object_type, uri, spec, name, relative_to,global_conf)</span>:</span>loader = FuncLoader(spec)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> loader.get_context(object_type, name, global_conf)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">FuncLoader</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(_Loader)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, spec)</span>:</span>self.spec = spec<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">':'</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> spec:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> LookupError(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Configuration not in format module:function"</span>)<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">get_context</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, object_type, name=None, global_conf=None)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 从uri -> module的过程主要是通过这个方法实现，实现方式主要是动态加载</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># module = __import__(parts)</span>obj = lookup_object(self.spec)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> LoaderContext(obj, object_type, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>, global_conf <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> {}, {}, self,)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>
<code class="hljs python has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">LoaderContext</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, obj, object_type, protocol,global_conf, local_conf, loader,distribution=None, entry_point_name=None)</span>:</span>self.object = objself.object_type = object_typeself.protocol = protocolself.global_conf = global_confself.local_conf = local_confself.loader = loaderself.distribution = distributionself.entry_point_name = entry_point_name<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 之前的create方法的定义在此</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">create</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self.object_type.invoke(self)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul>
这是之前APP = _App()的定义
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">_App</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(_ObjectType)</span>:</span>name = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'application'</span>egg_protocols = [<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.app_factory'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.composite_factory'</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.composit_factory'</span>]config_prefixes = [[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'app'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'application'</span>], [<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'composite'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'composit'</span>],<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'pipeline'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'filter-app'</span>]<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">invoke</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, context)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> context.protocol <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> (<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.composit_factory'</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.composite_factory'</span>):<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> fix_call(context.object,context.loader, context.global_conf,**context.local_conf)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">elif</span> context.protocol == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'paste.app_factory'</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> fix_call(context.object, context.global_conf, **context.local_conf)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">assert</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Protocol %r unknown"</span> % context.protocol</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li></ul>
之后调用了公共模块
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># paste/deploy/util.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">fix_call</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(callable, *args, **kw)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Call ``callable(*args, **kw)`` fixing any type errors that come out."""</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ###### 此处真正调用urlmap_factory工厂方法 ######</span>val = callable(*args, **kw)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> TypeError:exc_info = fix_type_error(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>, callable, args, kw)reraise(*exc_info)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> val</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/urlmap.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">urlmap_factory</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(loader, global_conf, **local_conf)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'not_found_app'</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> local_conf:not_found_app = local_conf.pop(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'not_found_app'</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:not_found_app = global_conf.get(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'not_found_app'</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> not_found_app:not_found_app = loader.get_app(not_found_app, global_conf=global_conf)urlmap = URLMap(not_found_app=not_found_app)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> path, app_name <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> local_conf.items():path = paste.urlmap.parse_path_expression(path)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 类似的方法加载section里面的各类app</span>app = loader.get_app(app_name, global_conf=global_conf)urlmap[path] = app<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> urlmap</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul>
至此，加载app的方法调用过程就走完一遍了，已经加载到我们需要的urlmap_factory，至于urlmap里面的app的加载方式跟上述方式整体上是大致一样的，这里不继续跟踪，不过可以看一下filter包裹app的过程。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/auth.py</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 在Liberty版本中采用的openstack compute api是v2.1</span> <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">pipeline_factory_v21</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(loader, global_conf, **local_conf)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""A paste pipeline replica that keys off of auth_strategy."""</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> _load_pipeline(loader, local_conf[CONF.auth_strategy].split())</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/auth.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_load_pipeline</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(loader, pipeline)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 加载pipeline中各个filter</span>filters = [loader.get_filter(n) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> n <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> pipeline[:-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>]]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 加载app（osapi_compute_app_v21）</span>app = loader.get_app(pipeline[-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>])<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 倒序filter</span>filters.reverse()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 反复使用filter包装app</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> filter <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> filters:app = filter(app)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> app</code>
0. 前言
这次看了一下nova list命令的执行过程，整个过程可以分为几步：HTTP请求、URLMap分发、过滤、APIRouter到具体执行函数，接下来使用Postman组个包并发送http请求作为开始对各个模块进行跟踪和注解。
1. HTTP请求
OpenStack组件都是通过RESTful API向外提供服务，也就是说可以通过http的方式操作OpenStack。而操作的大致步骤分为两步：身份认证、发送任务，我们可以看一下http命令的实际操作情况。
首先是身份认证，这一步由keystone完成，返回token。
之后我们可以拿这个获取到的token去进行具体操作。
2. URLMap分发
还是先看一下代码，之前在Liberty nova-api启动流程分析的最后我们看到osapi_compute app负责监听8774端口，其实这个服务就是一个URLMap的callable对象，现在接收到8774端口的http请求时，调用URLMap的call()。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/urlmap.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">URLMap</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(paste.urlmap.URLMap)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__call__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, environ, start_response)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># host = '172.29.152.111:8774'</span>host = environ.get(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'HTTP_HOST'</span>, environ.get(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'SERVER_NAME'</span>)).lower()... ... ... ...... ... ... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># path_info = '/v2.1/35a94cc2b7bd4f088019dbc61f6dce37'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># mime_type = None, app_url = '/v2.1'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app = <function wrap at 0x7ff89c03e410></span>mime_type, app, app_url = self._path_strategy(host, port, path_info)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (app_url <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> app_url + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'/'</span> == path_info) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> path_info == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'/'</span>:supported_content_types.append(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'application/atom+xml'</span>)... ... ... ...... ... ... ...<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> app:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># environ['nova.best_content_type'] = 'application/json'</span>environ[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova.best_content_type'</span>] = mime_type<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> app(environ, start_response)... ... ... ...... ... ... ...</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/urlmap.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">URLMap</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(paste.urlmap.URLMap)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_path_strategy</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, host, port, path_info)</span>:</span>... ... ... ...... ... ... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># parts = ['', 'v2.1', '35a94cc2b7bd4f088019dbc61f6dce37']</span>parts = path_info.split(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'/'</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> len(parts) > <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># possible_app = <oslo_middleware.cors.CORS object at 0x7ff89da5ff50></span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># possible_app_url = '/v2.1'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 这边开始进行版本匹配，获取相应的app</span>possible_app, possible_app_url = self._match(host, port, path_info)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> possible_app <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> possible_app_url:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app_url = '/v2.1'</span>app_url = possible_app_url<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app = <function wrap at 0x7ff89c03e410></span>app = self._munge_path(possible_app, path_info, app_url)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># mime_type = None</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app = <function wrap at 0x7ff89c03e410></span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app_url = '/v2.1'</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> mime_type, app, app_url</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li></ul>
之后的_match()方法真正实现根据版本调用app。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/urlmap.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">URLMap</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(paste.urlmap.URLMap)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 下面涉及到初始化的时候设置的applications参数，这边列出初始化的结果</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># self.applications = </span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># [((None, '/v2.1'), <oslo_middleware.cors.CORS object at 0x7ff89da5ff50>), </span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ((None, '/v2'), <oslo_middleware.cors.CORS object at 0x7ff89e15a310>), </span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ((None, ''), <nova.api.openstack.FaultWrapper object at 0x7ff89d9e5950>)]</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_match</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, host, port, path_info)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Find longest match for a given URL path."""</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># eg. v21版本对应的是openstack_compute_api_v21 app，根据pipeline的定义，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 最后一个filter是cors，所以可以看见app的类型如下：</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># domain = None</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app_url = '/v2.1'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># app = <oslo_middleware.cors.CORS object at 0x7ff89da5ff50></span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (domain, app_url), app <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> self.applications:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> domain <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> domain != host <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> domain != host + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">':'</span> + port:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">continue</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 这里根据之前初始化设置的urlmap进行匹配</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (path_info == app_url<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> path_info.startswith(app_url + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'/'</span>)):<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> app, app_url<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li></ul>
3. 过滤
之前获取的app是经过filter包装的，接下来按顺序看一下各个filter。
<code class="hljs ini has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 102, 102);">[composite:openstack_compute_api_v21]</span> <span class="hljs-setting" style="box-sizing: border-box;">use = <span class="hljs-value" style="box-sizing: border-box;">call:nova.api.auth:pipeline_factory_v21</span></span> <span class="hljs-setting" style="box-sizing: border-box;">keystone = <span class="hljs-value" style="box-sizing: border-box;">cors compute_req_id faultwrap sizelimit authtoken keystonecontext osapi_compute_app_v21</span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>
3.1 cors
CORS（Cross-Origin Resource Sharing，跨域资源共享），比如在编写JavaScript应用时如果需要直接使用openstack api，有可能会遇到同源策略的问题，那这边就需要扩展一下跨域资源共享，从代码的角度而言就是在api返回的response的header中加入Access-Control-Request-XXX等信息，这边简单列一下响应代码。
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[filter:cors] paste<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.filter</span>_factory = oslo_middleware<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.cors</span>:filter_factory oslo_config_project = nova</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_middleware/base.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ConfigurableMiddleware</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@webob.dec.wsgify</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__call__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, req)</span>:</span>response = self.process_request(req)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># response = None</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> response:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> response<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取app响应（调用下一个filter）</span>response = req.get_response(self.application)(args, varargs, varkw, defaults) = getargspec(self.process_response)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 对返回的response进行处理</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'request'</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> args:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self.process_response(response, request=req)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self.process_response(response)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_middleware/cors.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">CORS</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base.ConfigurableMiddleware)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">process_response</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, response, request=None)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Access-Control-Allow-Origin'</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> response.headers:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> response<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> request.method == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'OPTIONS'</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self._apply_cors_preflight_headers(request=request,response=response)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 设置CORS头信息</span>self._apply_cors_request_headers(request=request, response=response)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Finally, return the response.</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> response</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_middleware/cors.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">CORS</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base.ConfigurableMiddleware)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_apply_cors_preflight_headers</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, request, response)</span>:</span>... ... ... ...... ... ... ...response.headers[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Vary'</span>] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Origin'</span>response.headers[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Access-Control-Allow-Origin'</span>] = origin<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> cors_config[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'allow_credentials'</span>]:response.headers[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Access-Control-Allow-Credentials'</span>] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'true'</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'max_age'</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> cors_config <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> cors_config[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'max_age'</span>]:response.headers[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Access-Control-Max-Age'</span>] = str(cors_config[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'max_age'</span>])response.headers[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Access-Control-Allow-Methods'</span>] = request_method<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> request_headers:response.headers[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Access-Control-Allow-Headers'</span>] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">','</span>.join(request_headers)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> response</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul>
3.2 compute_req_id
此模块就是给接收到的request进行编号，这样可以方便对request任务进行跟踪。
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[filter:compute_req_id] paste<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.filter</span>_factory = nova<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.api</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.compute</span>_req_id:ComputeReqIdMiddleware<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.factory</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/compute_req_id.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ComputeReqIdMiddleware</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base.Middleware)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@webob.dec.wsgify</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__call__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, req)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建一个uuid作为request id</span>req_id = context.generate_request_id()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 在request的环境变量中加入req_id</span>req.environ[ENV_REQUEST_ID] = req_idresponse = req.get_response(self.application)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 如果'x-compute-request-id'不在response的header中，那就加上req_id</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> HTTP_RESP_HEADER_REQUEST_ID <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> response.headers:response.headers.add(HTTP_RESP_HEADER_REQUEST_ID, req_id)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> response</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_context/context.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">generate_request_id</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 其实就是直接生成uuid</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'req-%s'</span> % uuid.uuid4() </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>
3.3 faultwrap
此模块只对错误进行包装处理。
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[filter:faultwrap] paste<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.filter</span>_factory = nova<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.api</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.openstack</span>:FaultWrapper<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.factory</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">FaultWrapper</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base_wsgi.Middleware)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@webob.dec.wsgify(RequestClass=wsgi.Request)</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__call__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, req)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> req.get_response(self.application)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> Exception <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> ex:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self._error(ex, req)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>
3.4 sizelimit
此模块对request的body大小进行了限制，超出则抛出异常或者截取相应大小。
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[filter:sizelimit] paste<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.filter</span>_factory = oslo_middleware:RequestBodySizeLimiter<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.factory</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># oslo_middleware/sizelimit.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">RequestBodySizeLimiter</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base.ConfigurableMiddleware)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@webob.dec.wsgify</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__call__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, req)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 最大request body大小</span>max_size = self._conf_get(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'max_request_body_size'</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 超出默认大小的body则异常</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (req.content_length <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span>req.content_length > max_size):msg = _(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Request is too large."</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> webob.exc.HTTPRequestEntityTooLarge(explanation=msg)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 没有content_length字段则截取max_size大小的body</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> req.content_length <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> req.is_body_readable:limiter = LimitingReader(req.body_file, max_size)req.body_file = limiter<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self.application</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul>
3.5 authtoken
此模块主要是对token进行验证，并把token中的数据加到request的header中。
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[filter:authtoken] paste<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.filter</span>_factory = keystonemiddleware<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.auth</span>_token:filter_factory</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># keystonemiddleware/auth_token/__init__.py</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">filter_factory</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(global_conf, **local_conf)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Returns a WSGI filter app for use with paste.deploy."""</span>conf = global_conf.copy()conf.update(local_conf)<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">auth_filter</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(app)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> AuthProtocol(app, conf)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> auth_filter</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># keystonemiddleware/auth_token/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">BaseAuthProtocol</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@webob.dec.wsgify(RequestClass=_request._AuthTokenRequest)</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__call__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, req)</span>:</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"""Handle incoming request."""</span>response = self.process_request(req)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> response:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> responseresponse = req.get_response(self._app)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self.process_response(response)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>
接下来看一下process_request方法怎过滤request。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># keystonemiddleware/auth_token/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">AuthProtocol</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(BaseAuthProtocol)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">process_request</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, request)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 删除指定的header，防止被人仿冒身份进行认证</span>request.remove_auth_headers()self._token_cache.initialize(request.environ)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 在基类的定义中完成token的验证</span>resp = super(AuthProtocol, self).process_request(request)... ... ... ...... ... ... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 之后就是设置request header的相关参数</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> request.user_token_valid:user_auth_ref = request.token_auth._user_auth_refrequest.set_user_headers(user_auth_ref)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self._include_service_catalog:request.set_service_catalog_headers(user_auth_ref)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> request.service_token <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> request.service_token_valid:request.set_service_headers(request.token_auth._serv_auth_ref)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self.log.isEnabledFor(logging.DEBUG):self.log.debug(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Received request from %s'</span>,request.token_auth._log_format)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul>
在基类的process_request中完成了token的验证，具体过程涉及keystone
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># keystonemiddleware/auth_token/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">BaseAuthProtocol</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">process_request</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, request)</span>:</span>user_auth_ref = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>serv_auth_ref = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取request的token</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> request.user_token:self.log.debug(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Authenticating user token'</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取token的数据进行验证并转化成AccessInfo形式</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 这个动作稍复杂，主要是根据token是否在cache中进行不同的处理</span>data, user_auth_ref = self._do_fetch_token(request.user_token)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 验证token是否快要过期等</span>self._validate_token(user_auth_ref)self._confirm_token_bind(user_auth_ref, request)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> ksm_exceptions.InvalidToken:self.log.info(_LI(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Invalid user token'</span>))request.user_token_valid = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">False</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:request.user_token_valid = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>request.token_info = data... ... ... ...... ... ... ...request.token_auth = _user_plugin.UserAuthPlugin(user_auth_ref, serv_auth_ref)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># keystonemiddleware/auth_token/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">BaseAuthProtocol</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(object)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_do_fetch_token</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, token)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取token并做验证</span>data = self.fetch_token(token)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 返回token数据以及转换成AccessInfo形式的token</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> data, access.create(body=data, auth_token=token)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> Exception:self.log.warning(_LW(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Invalid token contents.'</span>), exc_info=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> ksm_exceptions.InvalidToken(_(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Token authorization failed'</span>))</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># keystonemiddleware/auth_token/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">AuthProtocol</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(BaseAuthProtocol)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">fetch_token</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, token)</span>:</span>data = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>token_hashes = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 为token生成hash，hash应该是token的标识符</span>token_hashes = self._token_hashes(token)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 根据hash在cache中获取token</span>cached = self._cache_get_hashes(token_hashes)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> cached:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 如果token在cache中，则获取cache中的token</span>data = cached<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 进一步验证token是否被撤销</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self._check_revocations_for_cached:self._revocations.check(token_hashes)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 如果token不在cache中，则根据不同类型（pkiz，pki，etc）的token进行相应的处理和验证</span>data = self._validate_offline(token, token_hashes)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> data:data = self._identity_server.verify_token(token)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 将token存入cache</span>self._token_cache.store(token_hashes[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>], data)... ... ... ...... ... ... ...<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> data</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li></ul>
3.6 keystonecontext
此模块负责把request header的内容读取出来赋值给context。
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[filter:keystonecontext] paste<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.filter</span>_factory = nova<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.api</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.auth</span>:NovaKeystoneContext<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.factory</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/auth.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">NovaKeystoneContext</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(wsgi.Middleware)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@webob.dec.wsgify(RequestClass=wsgi.Request)</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__call__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, req)</span>:</span>... ... ... ...... ... ... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取request的header中的值并用以初始化RequestContext</span>ctx = context.RequestContext(user_id,project_id,user_name=user_name,project_name=project_name,roles=roles,auth_token=auth_token,remote_address=remote_address,service_catalog=service_catalog,request_id=req_id,user_auth_plugin=user_auth_plugin)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 把上下文对象ctx加到request的环境变量</span>req.environ[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova.context'</span>] = ctx<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self.application</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li></ul>
4. APIRouter(V21)到具体执行函数
APIRouterV21继承自nova.wsgi.Router，主要完成对资源的加载以及http请求路由到具体方法。关于routes.mapper可以参考routes的官方文档 。
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[app:osapi_compute_app_v21] paste<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.app</span>_factory = nova<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.api</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.openstack</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.compute</span>:APIRouterV21<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.factory</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
这边首先看一下APIRouterV21的初始化部分，这一部分主要涉及资源的注册以及路由信息的创建。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/compute/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">APIRouterV21</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(nova.api.openstack.APIRouterV21)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, init_only=None)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _loaded_extension_info = {}</span>self._loaded_extension_info = extension_info.LoadedExtensionInfo()super(APIRouterV21, self).__init__(init_only)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">APIRouterV21</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base_wsgi.Router)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@staticmethod</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">api_extension_namespace</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova.api.v21.extensions'</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__init__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, init_only=None, v3mode=False)</span>:</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 验证扩展资源是否在黑名单中</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_check_load_extension</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(ext)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (self.init_only <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> ext.obj.alias <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span>self.init_only) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> isinstance(ext.obj, extensions.V21APIExtensionBase):<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> CONF.osapi_v21.extensions_whitelist <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span>ext.obj.alias <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> CONF.osapi_v21.extensions_whitelist):blacklist = CONF.osapi_v21.extensions_blacklist<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> ext.obj.alias <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> blacklist:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self._register_extension(ext)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">False</span>... ... ... ...... ... ... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 使用stevedore模块载入setup.cfg中'nova.api.v21.extensions'下的所有资源，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 使用check_func对资源进行验证</span>self.api_extension_manager = stevedore.enabled.EnabledExtensionManager(namespace=self.api_extension_namespace(),check_func=_check_load_extension,invoke_on_load=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>,invoke_kwds={<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"extension_info"</span>: self.loaded_extension_info})<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> v3mode:mapper = PlainMapper()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:mapper = ProjectMapper()self.resources = {}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> list(self.api_extension_manager):<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 调用每个资源的get_resources()方法进行注册，同时使用</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># mapper.resource()建立对应关系</span>self._register_resources_check_inherits(mapper)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 调用资源的get_controller_extensions()方法进行资源扩展</span>self.api_extension_manager.map(self._register_controllers)... ... ... ...... ... ... ...super(APIRouterV21, self).__init__(mapper)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">APIRouterV21</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base_wsgi.Router)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_register_resources_check_inherits</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, mapper)</span>:</span>... ... ... ...... ... ... ...self._register_resources_list(ext_no_inherits, mapper)self._register_resources_list(ext_has_inherits, mapper)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">APIRouterV21</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base_wsgi.Router)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_register_resources_list</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, ext_list, mapper)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> ext <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> ext_list:self._register_resources(ext, mapper)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>
接下来是真正实现资源注册和mapper初始化的部分。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/__init__.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">APIRouterV21</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(base_wsgi.Router)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_register_resources</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, ext, mapper)</span>:</span>handler = ext.objLOG.debug(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Running _register_resources on %s"</span>, ext.obj)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 使用各个资源的get_resources()方法进行创建资源，并且使用mapper创建路由信息</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> resource <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> handler.get_resources():LOG.debug(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Extended resource: %s'</span>, resource.collection)inherits = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> resource.inherits:inherits = self.resources.get(resource.inherits)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> resource.controller:resource.controller = inherits.controller<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建一个ResourceV21对象作为之后mapper的controller</span>wsgi_resource = wsgi.ResourceV21(resource.controller,inherits=inherits)self.resources[resource.collection] = wsgi_resource<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 组建mapper.resource的kargs参数。</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 这边以keypairs为例：</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># kargs = {'member': {}, </span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 'controller': <nova.api.openstack.wsgi.ResourceV21 object at 0x7fe6842b8990>, </span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 'collection': {}}</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># member和collection都为空说明除了标准映射之外不需要额外映射。</span>kargs = dict(controller=wsgi_resource,collection=resource.collection_actions,member=resource.member_actions)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> resource.parent:kargs[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'parent_resource'</span>] = resource.parent<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> resource.member_name:member_name = resource.member_name<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 以keypairs为例：</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># member_name = resource.collection = 'os-keypairs'</span>member_name = resource.collection<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 创建mapper映射规则</span>mapper.resource(member_name, resource.collection,**kargs)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> resource.custom_routes_fn:resource.custom_routes_fn(mapper, wsgi_resource)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li></ul>
至此，APIRouterV21已经初始化的过程已经大致了解了，之后开始继续之前的请求调用流程。
之前我们看到mapper中的controller是
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/wsgi.py</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 直接继承了Resource类</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ResourceV21</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(Resource)</span>:</span>support_api_request_version = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/wsgi.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Resource</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(wsgi.Application)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@webob.dec.wsgify(RequestClass=Request)</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">__call__</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, request)</span>:</span>... ... ... ...... ... ... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取request中的'wsgiorg.routing_args'值，</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 以nova list为例：action_args = {'action': u'detail', 'project_id': u'c884d1e936794f2a8e251342e1200c5d'}</span>action_args = self.get_action_args(request.environ)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取方法名称</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># action_args = {'project_id': u'c884d1e936794f2a8e251342e1200c5d'}</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># action = 'detail'</span>action = action_args.pop(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'action'</span>, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取报文格式和内容</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># content_type = 'text/plain'</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># body = ''</span>content_type, body = self.get_body(request)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取返回的报文类型，在初始化时进行过设定</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># accept = 'application/json'</span>accept = request.best_match_content_type()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> exception.InvalidContentType:msg = _(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Unsupported Content-Type"</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> Fault(webob.exc.HTTPBadRequest(explanation=msg))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 调用具体方法处理请求</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> self._process_stack(request, action, action_args,content_type, body, accept)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li></ul>
接下来看一下调用处理请求的步骤。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/wsgi.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Resource</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(wsgi.Application)</span>:</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">_process_stack</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, request, action, action_args,content_type, body, accept)</span>:</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取处理的方法meth</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># meth = <bound method ServersController.detail of <nova.api.openstack.compute.servers.ServersController object at 0x7f382bdcce90>></span>meth, extensions = self.get_method(request, action,content_type, body)... ... ... ...... ... ... ...<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:contents = {}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> self._should_have_body(request):<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> request.content_length == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>:contents = {<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'body'</span>: <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>}<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 反序列化客户端request的body</span>contents = self.deserialize(body)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> exception.MalformedRequestBody:msg = _(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Malformed request body"</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> Fault(webob.exc.HTTPBadRequest(explanation=msg))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 更新请求的参数到action_args</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># contents = {}</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># action_args = {'project_id': u'c884d1e936794f2a8e251342e1200c5d'}</span>action_args.update(contents)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取project_id(tenant_id)</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># project_id = u'c884d1e936794f2a8e251342e1200c5d'</span>project_id = action_args.pop(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"project_id"</span>, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">None</span>)context = request.environ.get(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova.context'</span>)... ... ... ...... ... ... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 执行前向扩展方法，扩展前序处理</span>response, post = self.pre_process_extensions(extensions,request, action_args)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> response:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> ResourceExceptionHandler():<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># ##### 执行controller中的请求处理方法 #####</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># action_result = {'servers': []}</span>action_result = self.dispatch(meth, request, action_args)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> Fault <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> ex:response = ex... ... ... ...... ... ... ...<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> resp_obj:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Do a preserialize to set up the response object</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> hasattr(meth, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'wsgi_code'</span>):resp_obj._default_code = meth.wsgi_code<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 执行后向扩展</span>response = self.post_process_extensions(post, resp_obj,request, action_args)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> resp_obj <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">not</span> response:response = resp_obj.serialize(request, accept)... ... ... ...... ... ... ...<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># response = 200 OK</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Content-Type: application/json</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Content-Length: 15</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># X-OpenStack-Nova-API-Version: 2.1</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># Vary: X-OpenStack-Nova-API-Version</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># {"servers": []}</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> response</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li></ul>
这里可以看一下dispatch方法的定义，可以看见就是直接调用处理方法。
<code class="hljs oxygene has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"># nova/api/openstack/wsgi.py<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> Resource(wsgi.Application):def dispatch(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span>, <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">method</span>, <span class="hljs-title" style="box-sizing: border-box;">request</span>, <span class="hljs-title" style="box-sizing: border-box;">action_args</span>):</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:# 直接调用<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">method</span><span class="hljs-title" style="box-sizing: border-box;">return</span> <span class="hljs-title" style="box-sizing: border-box;">method</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(req=request, **action_args)</span><span class="hljs-title" style="box-sizing: border-box;">except</span> <span class="hljs-title" style="box-sizing: border-box;">exception</span>.<span class="hljs-title" style="box-sizing: border-box;">VersionNotFoundForAPIMethod</span>:</span>return Fault(webob.exc.HTTPNotFound())</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>
最后我们看一下Controller中方法的定义。
<code class="language-python hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># nova/api/openstack/compute/servers.py</span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ServersController</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(wsgi.Controller)</span>:</span><span class="hljs-decorator" style="color: rgb(0, 102, 102); box-sizing: border-box;">@extensions.expected_errors((400, 403))</span><span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">detail</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(self, req)</span>:</span>context = req.environ[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'nova.context'</span>]authorize(context, action=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"detail"</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 获取servers列表</span>servers = self._get_servers(req, is_detail=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>)<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">except</span> exception.Invalid <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> err:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">raise</span> exc.HTTPBadRequest(explanation=err.format_message())<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> servers</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul>
到此为止，一个简单的nova list 的http请求执行流程就结束了，这边我的环境中没有开启虚拟机，所以这边servers为空。
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