关于 PHP 的框架 phalcon 学习(一) url 路由过程。

phalcon 这个轮子都说不错，可是对于看惯了 python源码的人，还是很有意思得，下面是对phalcon 的一点理解跟一点不完全的代码。项目是用 phalcon-tool 命令行自动生成的。

框架的入口文件是public 下的index.php, 具体内容如下，

try {/*** The FactoryDefault Dependency Injector automatically registers* the services that provide a full stack framework.*/$di = new FactoryDefault();/*** Handle routes*/include APP_PATH . '/config/router.php';/*** Read services*/include APP_PATH . '/config/services.php';/*** Get config service for use in inline setup below*/$config = $di->getConfig();/*** Include Autoloader*/include APP_PATH . '/config/loader.php';/*** Handle the request*/$application = new \Phalcon\Mvc\Application($di);

这个文件主要主要做了几个事情，实例化了 FactoryDefault ，这个东西主要是管理各种对象的容器。下面include 跟的是各种组件的路径，会被扫包。对 application 注入容器，处理request 请求,当然这是很初级的一个启动方式，你可以把一些公共服务比如 router ,session ，validator等服务，统一写在一个配置文件里，方便清晰。

router 路由需要自己定义，在程序开始就被注入容器，成为一个服务，对于 url 请求路由是通过 router handle 方法处理，具体源码如下。

public function handle(string! uri){var request, currentHostName, routeFound, parts,params, matches, notFoundPaths,vnamespace, module,  controller, action, paramsStr, strParams,route, methods, dependencyInjector,hostname, regexHostName, matched, pattern, handledUri, beforeMatch,paths, converters, part, position, matchPosition, converter, eventsManager;/*** Remove extra slashes in the route*/if this->_removeExtraSlashes && uri != "/" {let handledUri = rtrim(uri, "/");} else {let handledUri = uri;}let request = null,currentHostName = null,routeFound = false,parts = [],params = [],matches = null,this->_wasMatched = false,this->_matchedRoute = null;let eventsManager = this->_eventsManager;if typeof eventsManager == "object" {eventsManager->fire("router:beforeCheckRoutes", this);}/*** Routes are traversed in reversed order*/for route in reverse this->_routes {let params = [],matches = null;/*** Look for HTTP method constraints*/let methods = route->getHttpMethods();if methods !== null {/*** Retrieve the request service from the container*/if request === null {let dependencyInjector = <DiInterface> this->_dependencyInjector;if typeof dependencyInjector != "object" {throw new Exception("A dependency injection container is required to access the 'request' service");}let request = <RequestInterface> dependencyInjector->getShared("request");}/*** Check if the current method is allowed by the route*/if request->isMethod(methods, true) === false {continue;}}/*** Look for hostname constraints*/let hostname = route->getHostName();if hostname !== null {/*** Retrieve the request service from the container*/if request === null {let dependencyInjector = <DiInterface> this->_dependencyInjector;if typeof dependencyInjector != "object" {throw new Exception("A dependency injection container is required to access the 'request' service");}let request = <RequestInterface> dependencyInjector->getShared("request");}/*** Check if the current hostname is the same as the route*/if typeof currentHostName == "null" {let currentHostName = request->getHttpHost();}/*** No HTTP_HOST, maybe in CLI mode?*/if !currentHostName {continue;}/*** Check if the hostname restriction is the same as the current in the route*/if memstr(hostname, "(") {if !memstr(hostname, "#") {let regexHostName = "#^" . hostname;if !memstr(hostname, ":") {let regexHostName .= "(:[[:digit:]]+)?";}let regexHostName .= "$#i";} else {let regexHostName = hostname;}let matched = preg_match(regexHostName, currentHostName);} else {let matched = currentHostName == hostname;}if !matched {continue;}}if typeof eventsManager == "object" {eventsManager->fire("router:beforeCheckRoute", this, route);}/*** If the route has parentheses use preg_match*/let pattern = route->getCompiledPattern();if memstr(pattern, "^") {let routeFound = preg_match(pattern, handledUri, matches);} else {let routeFound = pattern == handledUri;}/*** Check for beforeMatch conditions*/if routeFound {if typeof eventsManager == "object" {eventsManager->fire("router:matchedRoute", this, route);}let beforeMatch = route->getBeforeMatch();if beforeMatch !== null {/*** Check first if the callback is callable*/if !is_callable(beforeMatch) {throw new Exception("Before-Match callback is not callable in matched route");}/*** Check first if the callback is callable*/let routeFound = call_user_func_array(beforeMatch, [handledUri, route, this]);}} else {if typeof eventsManager == "object" {let routeFound = eventsManager->fire("router:notMatchedRoute", this, route);}}if routeFound {/*** Start from the default paths*/let paths = route->getPaths(),parts = paths;/*** Check if the matches has variables*/if typeof matches == "array" {/*** Get the route converters if any*/let converters = route->getConverters();for part, position in paths {if typeof part != "string" {throw new Exception("Wrong key in paths: " . part);}if typeof position != "string" && typeof position != "integer" {continue;}if fetch matchPosition, matches[position] {/*** Check if the part has a converter*/if typeof converters == "array" {if fetch converter, converters[part] {let parts[part] = call_user_func_array(converter, [matchPosition]);continue;}}/*** Update the parts if there is no converter*/let parts[part] = matchPosition;} else {/*** Apply the converters anyway*/if typeof converters == "array" {if fetch converter, converters[part] {let parts[part] = call_user_func_array(converter, [position]);}} else {/*** Remove the path if the parameter was not matched*/if typeof position == "integer" {unset parts[part];}}}}/*** Update the matches generated by preg_match*/let this->_matches = matches;}let this->_matchedRoute = route;break;}}/*** Update the wasMatched property indicating if the route was matched*/if routeFound {let this->_wasMatched = true;} else {let this->_wasMatched = false;}/*** The route wasn't found, try to use the not-found paths*/if !routeFound {let notFoundPaths = this->_notFoundPaths;if notFoundPaths !== null {let parts = Route::getRoutePaths(notFoundPaths),routeFound = true;}}/*** Use default values before we overwrite them if the route is matched*/let this->_namespace = this->_defaultNamespace,this->_module = this->_defaultModule,this->_controller = this->_defaultController,this->_action = this->_defaultAction,this->_params = this->_defaultParams;if routeFound {/*** Check for a namespace*/if fetch vnamespace, parts["namespace"] {if !is_numeric(vnamespace) {let this->_namespace = vnamespace;}unset parts["namespace"];}/*** Check for a module*/if fetch module, parts["module"] {if !is_numeric(module) {let this->_module = module;}unset parts["module"];}/*** Check for a controller*/if fetch controller, parts["controller"] {if !is_numeric(controller) {let this->_controller = controller;}unset parts["controller"];}/*** Check for an action*/if fetch action, parts["action"] {if !is_numeric(action) {let this->_action = action;}unset parts["action"];}/*** Check for parameters*/if fetch paramsStr, parts["params"] {if typeof paramsStr == "string" {let strParams = trim(paramsStr, "/");if strParams !== "" {let params = explode("/", strParams);}}unset parts["params"];}if count(params) {let this->_params = array_merge(params, parts);} else {let this->_params = parts;}}if typeof eventsManager == "object" {eventsManager->fire("router:afterCheckRoutes", this);}}

这么多，前面一大堆判断，用处大得就两个方法，getCompiledPattern 取出 uri 所有样式，然后调用 preg_match 方法来比较请求得uri 跟自己设置得uri 样式是否一致，一致得话就调用checkcontroller 方法跟 checkaction 方法，找出正确得视图跟方 action。

当 uri 的 request 来到正确的 controller 跟 action ，就该调用 model 层跟数据库交互。常见的是这种交互方式，基于视图的交互方式，贴出源码

 $this -> view -> setVars(array('categoryList' => $categoryList,'article' => $article,));$this -> view -> pick('articles/write');}

view 服务是自己找到 view视图类文件夹，然后注入容器的，关键是这个pick 方法做了什么？下面贴出源码

public function pick(var renderView) -> <View>{var pickView, layout, parts;if typeof renderView == "array" {let pickView = renderView;} else {let layout = null;if memstr(renderView, "/") {let parts = explode("/", renderView), layout = parts[0];}let pickView = [renderView];if layout !== null {let pickView[] = layout;}}let this->_pickView = pickView;return this;

这个方法主要作用是把查询出的变量渲染进模板，返回给B端。

关于 restfiful 风格接口一点设想，可以借鉴django

方法	URL	操作
`GET`	/api/robots	检索所有的机器人
`GET`	/api/robots/search/Astro	在他们的名字与 'Astro' 机器人搜索
`GET`	/api/robots/2	检索基于主键机器人
`POST`	/api/robots	添加一个新的机器人
`PUT`	/api/robots/2	Updates robots based on primary key
`DELETE`	/api/robots/2	删除基于主键机器人

好了，有时间明天继续看。

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关于 PHP 的框架 phalcon 学习(一) url 路由过程。

关于 PHP 的框架 phalcon 学习(一) url 路由过程。相关推荐

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