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Laravel框架下路由的使用(源码解析)

时间:2019-11-05 00:34:01      阅读:97      评论:0      收藏:0      [点我收藏+]

标签:within   dde   控制器   ddt   any   rap   开始   cts   uil   

本篇文章给大家带来的内容是关于Laravel框架下路由的使用(源码解析),有一定的参考价值,有需要的朋友可以参考一下,希望对你有所帮助。

前言

我的解析文章并非深层次多领域的解析攻略。但是参考着开发文档看此类文章会让你在日常开发中更上一层楼。

废话不多说,我们开始本章的讲解。

入口

Laravel启动后,会先加载服务提供者、中间件等组件,在查找路由之前因为我们使用的是门面,所以先要查到Route的实体类。

注册

第一步当然还是通过服务提供者,因为这是laravel启动的关键,在 RouteServiceProvider 内加载路由文件。

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protected function mapApiRoutes()

{

    Route::prefix(‘api‘)

         ->middleware(‘api‘)

         ->namespace($this->namespace// 设置所处命名空间

         ->group(base_path(‘routes/api.php‘));  //所得路由文件绝对路径

}

首先require是不可缺少的。因路由文件中没有命名空间。 Illuminate\Routing\Router 下方法

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protected function loadRoutes($routes)

{

    if ($routes instanceof Closure) {

        $routes($this);

    } else {

        $router = $this;

 

        require $routes;

    }

}

随后通过路由找到指定方法,依旧是 Illuminate\Routing\Router 内有你所使用的所有路由相关方法,例如get、post、put、patch等等,他们都调用了统一的方法 addRoute

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public function addRoute($methods, $uri, $action)

{

    return $this->routes->add($this->createRoute($methods, $uri, $action));

}

之后通过 Illuminate\Routing\RouteCollection addToCollections 方法添加到集合中

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protected function addToCollections($route)

{

    $domainAndUri = $route->getDomain().$route->uri();

 

    foreach ($route->methods() as $method) {

        $this->routes[$method][$domainAndUri] = $route;

    }

 

    $this->allRoutes[$method.$domainAndUri] = $route;

}

添加后的结果如下图所示

技术图片

调用

通过 Illuminate\Routing\Router 方法开始运行路由实例化的逻辑

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protected function runRoute(Request $request, Route $route)

{

    $request->setRouteResolver(function () use ($route) {

         

        return $route;

    });

    $this->events->dispatch(new Events\RouteMatched($route, $request));

 

    return $this->prepareResponse($request,

        $this->runRouteWithinStack($route, $request)

    );

}

....

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() // 此处调用run方法

                        );

                    });

}

在 Illuminate\Routing\Route 下 run 方用于执行控制器的方法

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public function run()

{

    $this->container = $this->container ?: new Container;

 

    try {

        if ($this->isControllerAction()) {

            return $this->runController(); //运行一个路由并作出响应

        }

             

        return $this->runCallable();

    } catch (HttpResponseException $e) {

        return $e->getResponse();

    }

}

从上述方法内可以看出 runController 是运行路由的关键,方法内运行了一个调度程序,将控制器 $this->getController() 和控制器方法 $this->getControllerMethod() 传入到 dispatch 调度方法内

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protected function runController()

{

     

    return $this->controllerDispatcher()->dispatch(

        $this, $this->getController(), $this->getControllerMethod()

    );

}

这里注意 getController() 才是真正的将控制器实例化的方法

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public function getController()

{

     

    if (! $this->controller) {

        $class = $this->parseControllerCallback()[0]; // 0=>控制器 xxController 1=>方法名 index

        $this->controller = $this->container->make(ltrim($class, ‘\\‘)); // 交给容器进行反射

    }

 

    return $this->controller;

}

实例化

依旧通过反射加载路由指定的控制器,这个时候build的参数$concrete = App\Api\Controllers\XxxController

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public function build($concrete)

{

    // If the concrete type is actually a Closure, we will just execute it and

    // hand back the results of the functions, which allows functions to be

    // used as resolvers for more fine-tuned resolution of these objects.

    if ($concrete instanceof Closure) {

        return $concrete($this, $this->getLastParameterOverride());

    }

     

    $reflector = new ReflectionClass($concrete);

    // If the type is not instantiable, the developer is attempting to resolve

    // an abstract type such as an Interface of Abstract Class and there is

    // no binding registered for the abstractions so we need to bail out.

    if (! $reflector->isInstantiable()) {

        return $this->notInstantiable($concrete);

    }

     

         

    $this->buildStack[] = $concrete;

 

    $constructor = $reflector->getConstructor();

    // If there are no constructors, that means there are no dependencies then

    // we can just resolve the instances of the objects right away, without

    // resolving any other types or dependencies out of these containers.

    if (is_null($constructor)) {

     

            array_pop($this->buildStack);

     

            return new $concrete;

    }

 

    $dependencies = $constructor->getParameters();

    // Once we have all the constructor‘s parameters we can create each of the

    // dependency instances and then use the reflection instances to make a

    // new instance of this class, injecting the created dependencies in.

    $instances = $this->resolveDependencies(

        $dependencies

    );

 

    array_pop($this->buildStack);

     

    return $reflector->newInstanceArgs($instances);

}

这时将返回控制器的实例,下面将通过url访问指定方法,一般控制器都会继承父类 Illuminate\Routing\Controller ,laravel为其设置了别名 BaseController

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public function dispatch(Route $route, $controller, $method)

{

     

    $parameters = $this->resolveClassMethodDependencies(

        $route->parametersWithoutNulls(), $controller, $method

    );

 

    if (method_exists($controller, ‘callAction‘)) {

 

            return $controller->callAction($method, $parameters);

    }

         

    return $controller->{$method}(...array_values($parameters));

}

Laravel通过controller继承的callAction去调用子类的指定方法,也就是我们希望调用的自定义方法。

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public function callAction($method, $parameters)

{

    return call_user_func_array([$this, $method], $parameters);

}

Laravel框架下路由的使用(源码解析)

标签:within   dde   控制器   ddt   any   rap   开始   cts   uil   

原文地址:https://www.cnblogs.com/it-3327/p/11795668.html

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