• Laravel框架下路由的使用(源码解析)


    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。

    1

    2

    3

    4

    5

    6

    7

    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。 IlluminateRoutingRouter 下方法

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    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 IlluminateRoutingRouter 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

    1

    2

    3

    4

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

    {

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

    }

    之后通过 IlluminateRoutingRouteCollection addToCollections 方法添加到集合中

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    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

    调用

    通过 IlluminateRoutingRouter 方法开始运行路由实例化的逻辑

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    11

    12

    13

    14

    15

    16

    17

    18

    19

    20

    21

    22

    23

    24

    25

    26

    27

    28

    29

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

    {

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

             

            return $route;

        });

        $this->events->dispatch(new EventsRouteMatched($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 IlluminateRoutingRoute 下 run 方用于执行控制器的方法

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    11

    12

    13

    14

    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

    1

    2

    3

    4

    5

    6

    7

    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

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    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;

    }

    链接:https://pan.baidu.com/s/1v5gm7n0L7TGyejCmQrMh2g 提取码:x2p5

    免费分享,但是X度限制严重,如若链接失效点击链接或搜索加群 群号518475424

    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 = AppApiControllersXxxController

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    11

    12

    13

    14

    15

    16

    17

    18

    19

    20

    21

    22

    23

    24

    25

    26

    27

    28

    29

    30

    31

    32

    33

    34

    35

    36

    37

    38

    39

    40

    41

    42

    43

    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 IlluminateRoutingController ,laravel为其设置了别名 BaseController

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    11

    12

    13

    14

    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。

    1

    2

    3

    4

    public function callAction($method, $parameters)

    {

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

    }

  • 相关阅读:
    送给热爱书法的朋友们
    [原创]中秋随笔 祝大家中秋快乐
    Comsenz力邀您的加盟
    夜半冻醒有感
    Comsenz力邀您的加盟
    成熟的谷子先低头
    [转载]10个经典的web2.0配色方案网站
    无法嵌入互操作类型“Microsoft.Office.Interop.Excel.ApplicationClass”
    C#获取真实IP地址及分析
    使用TRY CATCH进行SQL Server异常处理
  • 原文地址:https://www.cnblogs.com/it-3327/p/11795668.html
Copyright © 2020-2023  润新知