from werkzeug.wsgi import DispatcherMiddleware
from werkzeug.serving import run_simple
from flask import Flask, current_appapp1 = Flask('app01')app2 = Flask('app02')@app1.route('/index')
def index():return "app01"@app2.route('/index2')
def index2():return "app2"# app1匹配路由时不需要前缀，app2匹配路由时要加上/sec前缀
dm = DispatcherMiddleware(app1, {'/sec': app2,
})
# 得到的这个dm对象没有run方法
# 所以要用run_simpleif __name__ == "__main__":app2.__call__run_simple('localhost', 5000, dm)

class DispatcherMiddleware(object):def __init__(self, app, mounts=None):# dm = DispatcherMiddleware(#       app1, # {  '/sec': app2,})# 所以app就是app1，mounts就是{  '/sec': app2,}self.app = appself.mounts = mounts or {}def __call__(self, environ, start_response):# 得到当前请求对应的url，比如、/sec/index# 第二种情况，app1对应的url，比如/index没有前缀# 那么while只循环一次就推出了script = environ.get('PATH_INFO', '')path_info = ''# 循环判断/是否在url中# 第二次循环script就变成/sec了while '/' in script:# 第一次进来时这个条件不成立,mounts={"/sec":app2}# 第二次进来时条件成立if script in self.mounts:# 获取到的app就是app2app = self.mounts[script]break# 将url按/右分割，得到script是/sec，last_item是indexscript, last_item = script.rsplit('/', 1)# 拼接url，得到path_info就是/indexpath_info = '/%s%s' % (last_item, path_info)else:# while循环结束后依照字典中对应的url前缀取出app2# 第二种情况while循环结束后，字典中没有对应的url前缀，所以就用默认值self.app就是app1app = self.mounts.get(script, self.app)original_script_name = environ.get('SCRIPT_NAME', '')environ['SCRIPT_NAME'] = original_script_name + scriptenviron['PATH_INFO'] = path_info# app即是app2，加括号，执行对象的__call__方法，也就是Flask的__call__方法，从这里开始就是我们熟悉的了# 第二种情况url没有前缀这里的app就是app1return app(environ, start_response)

from flask import Flask, current_app, globals, _app_ctx_stackapp1 = Flask('app01')
app1.debug = False  # 用户/密码/邮箱

app2 = Flask('app02')
app2.debug = True  # 用户/密码/邮箱
# 这样嵌套的app，stack属性列表中就不会只有一个值了，
with app1.app_context():  # __enter__方法 -> push -> app_ctx添加到_app_ctx_stack.local# {<greenlet.greenlet object at 0x00000000036E2340>: {'stack': [<flask.ctx.AppContext object at 0x00000000037CA438>]}}print(_app_ctx_stack._local.__storage__)print(current_app.config['DEBUG'])with app2.app_context():# {<greenlet.greenlet object at 0x00000000036E2340>: {'stack': [<flask.ctx.AppContext object at 0x00000000037CA438> ]}}print(_app_ctx_stack._local.__storage__)print(current_app.config['DEBUG'])print(current_app.config['DEBUG'])