php slim route,学习Slim Framework for PHP v3 (六)--route怎么被匹配的?

阙奇思
2023-12-01

先标记觉得以后会用到的内容:

// add route to the request‘s attributes in case a middleware or handler needs access to the route

$request = $request->withAttribute(‘route‘, $route);

或许以后可以在Middleware中拿到route做些其他的事情。

上篇已经分析到route是在APP的__invoke()中被调用的,这里来看看怎么匹配route的。大概的调用过程如下:

APP->__invoke()

\

$request = $this->dispatchRouterAndPrepareRoute($request, $router);

\

$routeInfo = $router->dispatch($request);

\

$this->createDispatcher()->dispatch($request->getMethod(),$uri); (告知是否找到,并且给出route的id)

\

\FastRoute\simpleDispatcher(function (RouteCollector $r){}) (将所有的route存放在RouteCollector中,并且返回GroupCountBased)

\

foreach ($this->getRoutes() as $route) {

$r->addRoute($route->getMethods(), $route->getPattern(), $route->getIdentifier());

}

在APP __invoke里会去寻找匹配的route。route在router中,自然要去routers中去寻找,调用了 $router->dispatch($request)。在router的dispatch中会创建一个Dispatcher,$this->createDispatcher()。

在createDispatcher()会使用一个命名空间公共函数\FastRoute\simpleDispatcher()。它将每个route的方法(get/post)、pattern、identify组成一个数组放入 RouteCollector 中,再通过GroupCountBased的构造方法将RouteCollector的数据都传入GroupCountBased。$this->createDispatcher()->dispatch($request->getMethod(),$uri)的dispatch其实是GroupCountBased的dispatch()方法。

GroupCountBased->dispatch($request->getMethod(),$uri)会匹配相应的route。这匹配的办法其实很简单,就是判断所传入的method与uri是否在数组中能取到($this->staticRouteMap[$httpMethod][$uri])。返回匹配到与否的标志、route的identify。

App->dispatchRouterAndPrepareRoute()会将返回的route匹配结果保留并存入到requst 中,这样以后再request中就直接可以拿到对应的route了,想起来棒棒的,但是肿么拿呢。

APP->__invoke()执行进行route的执行:

if ($routeInfo[0] === Dispatcher::FOUND) {

$route = $router->lookupRoute($routeInfo[1]);

return $route->run($request, $response);

} elseif ($routeInfo[0] === Dispatcher::METHOD_NOT_ALLOWED) {

if (!$this->container->has(‘notAllowedHandler‘)) {

throw new MethodNotAllowedException($request, $response, $routeInfo[1]);

}

/** @var callable $notAllowedHandler */

$notAllowedHandler = $this->container->get(‘notAllowedHandler‘);

return $notAllowedHandler($request, $response, $routeInfo[1]);

}

$route = $router->lookupRoute($routeInfo[1]); 通过route的identify找到route。

route->run执行route。

run的结果最后就是执行自己的__invoke,从所有的middleware开始执行,栈的最后一个元素是自己。

/**

* Dispatch route callable against current Request and Response objects

*

* This method invokes the route object‘s callable. If middleware is

* registered for the route, each callable middleware is invoked in

* the order specified.

*

* @param ServerRequestInterface $request The current Request object

* @param ResponseInterface $response The current Response object

* @return \Psr\Http\Message\ResponseInterface

* @throws \Exception if the route callable throws an exception

*/

public function __invoke(ServerRequestInterface $request, ResponseInterface $response)

{

//debug_print_backtrace();

$this->callable = $this->resolveCallable($this->callable);

/** @var InvocationStrategyInterface $handler */

$handler = isset($this->container) ? $this->container->get(‘foundHandler‘) : new RequestResponse();

// invoke route callable

if ($this->outputBuffering === false) {

$newResponse = $handler($this->callable, $request, $response, $this->arguments);

} else {

try {

ob_start();

$newResponse = $handler($this->callable, $request, $response, $this->arguments);

$output = ob_get_clean();

} catch (Exception $e) {

ob_end_clean();

throw $e;

}

}

if ($newResponse instanceof ResponseInterface) {

// if route callback returns a ResponseInterface, then use it

$response = $newResponse;

} elseif (is_string($newResponse)) {

// if route callback returns a string, then append it to the response

if ($response->getBody()->isWritable()) {

$response->getBody()->write($newResponse);

}

}

if (!empty($output) && $response->getBody()->isWritable()) {

if ($this->outputBuffering === ‘prepend‘) {

// prepend output buffer content

$body = new Http\Body(fopen(‘php://temp‘, ‘r+‘));

$body->write($output . $response->getBody());

$response = $response->withBody($body);

} elseif ($this->outputBuffering === ‘append‘) {

// append output buffer content

$response->getBody()->write($output);

}

}

return $response;

}

$this->callable = $this->resolveCallable($this->callable);用来将class::method的callback组成正常的callback。

$handler 是找到的策略,在handler会执行 call_user_func(),也就是route的闭包函数被执行了,也就是route此时被执行。 这样将得到reponse返回或者将得到的字符串结果写入网页中。

原文:http://www.cnblogs.com/lmenglliren89php/p/5164378.html

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