Laravel 路由执行

代码展示

protected function runRouteWithinStack(Route $route, Request $request){    $shouldSkipMiddleware = $this->container->bound('middleware.disable') &&                            $this->container->make('middleware.disable') === true;    $middleware = $shouldSkipMiddleware ? [] : $this->gatherRouteMiddleware($route);    return (new Pipeline($this->container))                    ->send($request)                    ->through($middleware)                    ->then(function ($request) use ($route) {                        return $this->prepareResponse(                            $request, $route->run()                        );                    });}public function run(){    $this->container = $this->container ?: new Container;    try {        // 控制器形式(Controller@Method)        if ($this->isControllerAction()) {            return $this->runController();        }        // 匿名函数形式        return $this->runCallable();    } catch (HttpResponseException $e) {        return $e->getResponse();    }}

控制器形式处理

protected function runController(){    return (new ControllerDispatcher($this->container))->dispatch(        $this, $this->getController(), $this->getControllerMethod()    );}public function getController(){    $class = $this->parseControllerCallback()[0];    if (! $this->controller) {        $this->controller = $this->container->make($class);    }    return $this->controller;}protected function getControllerMethod(){    return $this->parseControllerCallback()[1];}protected function parseControllerCallback(){    return Str::parseCallback($this->action['uses']);}public static function parseCallback($callback, $default = null){    return static::contains($callback, '@') ? explode('@', $callback, 2) : [$callback, $default];}// Illuminate\Routing\ControllerDispatcherpublic function __construct(Container $container){    $this->container = $container;}public function dispatch(Route $route, $controller, $method){    // 控制器参数解析    $parameters = $this->resolveClassMethodDependencies(        $route->parametersWithoutNulls(), $controller, $method    );    if (method_exists($controller, 'callAction')) {        return $controller->callAction($method, $parameters);    }    return $controller->{$method}(...array_values($parameters));}public function parametersWithoutNulls(){    // 返回过滤的从路径或主机名解析出来的对应的参数数组，类似 ['post'=>1,'comment'=>2]    return array_filter($this->parameters(), function ($p) {        return ! is_null($p);    });}protected function resolveClassMethodDependencies(array $parameters, $instance, $method){    // __invoke 方式调用    if (! method_exists($instance, $method)) {        return $parameters;    }    return $this->resolveMethodDependencies(        $parameters, new ReflectionMethod($instance, $method)    );}// 控制器的方法可以有自己的区别于路由参数的类类型参数，其他参数只能从路由获取public function resolveMethodDependencies(array $parameters, ReflectionFunctionAbstract $reflector){    $results = [];    $instanceCount = 0;    $values = array_values($parameters);        foreach ($reflector->getParameters() as $key => $parameter) {        // 类方法自己的类类型参数，尝试实例化        $instance = $this->transformDependency(            $parameter, $parameters        );                if (! is_null($instance)) {            $instanceCount++;            $results[] = $instance;        } else {    // 按照类方法的参数顺序依次存放数据            $results[] = isset($values[$key - $instanceCount])                ? $values[$key - $instanceCount] : $parameter->getDefaultValue();        }    }    return $results;}protected function transformDependency(ReflectionParameter $parameter, $parameters){    $class = $parameter->getClass();    // 类类型且没有实例化，则通过服务容器解决参数的依赖关系，并进行实例化    if ($class && ! $this->alreadyInParameters($class->name, $parameters)) {        return $this->container->make($class->name);    }}protected function alreadyInParameters($class, array $parameters){    return ! is_null(Arr::first($parameters, function ($value) use ($class) {        return $value instanceof $class;    }));}public function callAction($method, $parameters){    return call_user_func_array([$this, $method], $parameters);}

小结：

匿名函数形式处理

protected function runCallable(){    $callable = $this->action['uses'];    // 一样的处理方式    return $callable(...array_values($this->resolveMethodDependencies(        $this->parametersWithoutNulls(), new ReflectionFunction($this->action['uses'])    )));}

返回

即控制器的返回