Hyperf源码分析 - Http 路由

2023-09-28 11:12:01 浏览数 (1)

FastRoute

在官方文档提到 默认情况下路由由 nikic/fast-route 提供支持,并由 hyperf/http-server 组件负责接入到 Hyperf 中,RPC 路由由对应的 hyperf/rpc-server 组件负责

路由收集

路由收集在服务启动,初始化服务注册服务事件的时候,在Hyperf 启动章节中有提到。在初始化事件回调类的时候,通过 createDispatcher方法初始化路由。在HttpServer的initCoreMiddleware

$this->routerDispatcher = $this->createDispatcher($serverName); 这个语句就是点对路由收集。

代码语言:javascript复制
public function __construct()
  {
    $this->initAnnotationRoute(AnnotationCollector::list());
    $this->initConfigRoute();
  }

注解路由

拿到所有的 AutoController 和 Controller 注解类,同时获取该类的中间返回给到HttpServer调度。

代码语言:javascript复制
protected function initAnnotationRoute(array $collector): void
  {
    foreach ($collector as $className => $metadata) {
      if (isset($metadata['_c'][AutoController::class])) {
        if ($this->hasControllerAnnotation($metadata['_c'])) {
          $message = sprintf('AutoController annotation can't use with Controller annotation at the same time in %s.', $className);
          throw new ConflictAnnotationException($message);
        }
        $middlewares = $this->handleMiddleware($metadata['_c']);
        $this->handleAutoController($className, $metadata['_c'][AutoController::class], $middlewares, $metadata['_m'] ?? []);
      }
      if (isset($metadata['_c'][Controller::class])) {
        $middlewares = $this->handleMiddleware($metadata['_c']);
        $this->handleController($className, $metadata['_c'][Controller::class], $metadata['_m'] ?? [], $middlewares);
      }
    }
  }

AutoController

  • 获取注解中路由前缀$prefix
  • $router 本服务的路由收集对象 RouteCollector
  • 自动将控制器方法注册成路由,默认请求方法是 ['GET', 'POST', 'HEAD']
  • 读取方法中间件
  • 默认路由:是 $defaultAction = "/index",也就是控制器中的index方法会默认注册空路由。
代码语言:javascript复制
protected function handleAutoController(string $className, AutoController $annotation, array $middlewares = [], array $methodMetadata = []): void
  {
    $class = ReflectionManager::reflectClass($className);
    $methods = $class->getMethods(ReflectionMethod::IS_PUBLIC);
    $prefix = $this->getPrefix($className, $annotation->prefix);
    $router = $this->getRouter($annotation->server);

    $autoMethods = ['GET', 'POST', 'HEAD'];
    $defaultAction = '/index';
    foreach ($methods as $method) {
      $options = $annotation->options;
      $path = $this->parsePath($prefix, $method);
      $methodName = $method->getName();
      if (substr($methodName, 0, 2) === '__') {
        continue;
      }

      $methodMiddlewares = $middlewares;
      // Handle method level middlewares.
      if (isset($methodMetadata[$methodName])) {
        $methodMiddlewares = array_merge($methodMiddlewares, $this->handleMiddleware($methodMetadata[$methodName]));
      }

      // Rewrite by annotation @Middleware for Controller.
      $options['middleware'] = array_unique($methodMiddlewares);

      $router->addRoute($autoMethods, $path, [$className, $methodName], $options);

      if (Str::endsWith($path, $defaultAction)) {
        $path = Str::replaceLast($defaultAction, '', $path);
        $router->addRoute($autoMethods, $path, [$className, $methodName], $options);
      }
    }
  }

Controller

  • 获取注解中路由前缀$prefix
  • $router 本服务的路由收集对象 RouteCollector
  • 遍历控制器中有注解的方法,获取方法中的注解信息,例如Mapping和Middleware注解。
  • 合并控制器的中间件、方法注解中间件和mapping中options定义的中间件
  • 拿到mapping 中的 $path 作为路由
代码语言:javascript复制
protected function handleController(string $className, Controller $annotation, array $methodMetadata, array $middlewares = []): void
  {
    if (! $methodMetadata) {
      return;
    }
    $prefix = $this->getPrefix($className, $annotation->prefix);
    $router = $this->getRouter($annotation->server);

    $mappingAnnotations = [
      RequestMapping::class,
      GetMapping::class,
      PostMapping::class,
      PutMapping::class,
      PatchMapping::class,
      DeleteMapping::class,
      ];

    foreach ($methodMetadata as $methodName => $values) {
      $options = $annotation->options;
      $methodMiddlewares = $middlewares;
      // Handle method level middlewares.
      if (isset($values)) {
        $methodMiddlewares = array_merge($methodMiddlewares, $this->handleMiddleware($values));
      }

      // Rewrite by annotation @Middleware for Controller.
      $options['middleware'] = array_unique($methodMiddlewares);

      foreach ($mappingAnnotations as $mappingAnnotation) {
        /** @var Mapping $mapping */
        if ($mapping = $values[$mappingAnnotation] ?? null) {
          if (! isset($mapping->path) || ! isset($mapping->methods) || ! isset($mapping->options)) {
            continue;
          }
          $methodOptions = Arr::merge($options, $mapping->options);
          // Rewrite by annotation @Middleware for method.
          $methodOptions['middleware'] = $options['middleware'];
          $path = $mapping->path;

          if ($path === '') {
            $path = $prefix;
          } elseif ($path[0] !== '/') {
            $path = $prefix . '/' . $path;
          }
          $router->addRoute($mapping->methods, $path, [$className, $methodName], $methodOptions);
        }
      }
    }
  }

配置路由

  • 通过 require_once 引入配置文件 protected $routes = [BASE_PATH . '/config/routes.php'];
  • 在配置文件中,通过 HyperfHttpServerRouterRouter 一系列静态方法进行处理。
    • 用一个静态变量(static::$factory)存储 DispatcherFactory
    • 通过魔术方法 __callStatic 拿到可以收集路由的 $router 对象 $router = static::$factory->getRouter(static::$serverName);
代码语言:javascript复制
public function initConfigRoute()
  {
    Router::init($this);
    foreach ($this->routes as $route) {
      if (file_exists($route)) {
        require_once $route;
      }
    }
  }
代码语言:javascript复制
class Router
{
    /**
     * @var string
     */
    protected static $serverName = 'http';

    /**
     * @var DispatcherFactory
     */
    protected static $factory;

    public static function __callStatic($name, $arguments)
    {
        $router = static::$factory->getRouter(static::$serverName);
        return $router->{$name}(...$arguments);
    }

    public static function addServer(string $serverName, callable $callback)
    {
        static::$serverName = $serverName;
        call($callback);
        static::$serverName = 'http';
    }

    public static function init(DispatcherFactory $factory)
    {
        static::$factory = $factory;
    }
}

路由组成

查看每一个路由器的组成,找到 HyperfHttpServerRouterRouteCollector中的 addRoute看出。主要由

  • $httpMethod:请求方法,get、post等
  • $route:路由路径,包含参数匹配规则。
  • $handler:路由处理回调,例如控制器方法。
  • $options:其他参数,在这里最重要是用来存储每个路由对应处理的中间件。

路由匹配

在 HttpServer 中有讲到,所有的http请求都是固定有一个核心中间件 CoreMiddleware 处理的,在中间件处理之前,会先执行中间件的调度器 dispatch

这个调度器就是将请求获得的请求方法,请求uri 通过路由调度器获得匹配的路由数组 $routes,

再实例化一个Hyperf定义的路由调度器。并将这个调度器挂载请求对象中。

代码语言:javascript复制
public function dispatch(ServerRequestInterface $request): ServerRequestInterface
  {
    $routes = $this->dispatcher->dispatch($request->getMethod(), $request->getUri()->getPath());
    $dispatched = new Dispatched($routes);

    return Context::set(ServerRequestInterface::class, $request->withAttribute(Dispatched::class, $dispatched));
  }

FastRouteDispatcher 调度器

在 DispatcherFactory 处理类中,使用 GroupCountBased 作为服务路由调度器,GroupCountBased基础 RegexBasedAbstract 中的 dispatch 方法。所以这个 dispatch 方法就是将 请求方法,和请求Uri解析成指定对应路由的核心方法。最终解析结果就是 $routes 具体的格式就是

  • NOT_FOUND 未匹配到合适的路由
  • METHOD_NOT_ALLOWED 有路由,但是请求方法不合适
  • FOUND 完全匹配到路由
    • 路由处理方法(例如控制器业务)
    • 参数数组
代码语言:javascript复制
*     [Dispatcher::NOT_FOUND]
*     [Dispatcher::METHOD_NOT_ALLOWED, ['GET', 'OTHER_ALLOWED_METHODS']]
*     [Dispatcher::FOUND, $handler, ['varName' => 'value', ...]]

Hyperf 定义的路由调度器

这个调度器其实只是做了一个封装,让后续的业务方法调用而已。

代码语言:javascript复制
class Dispatched
{
    /**
     * @var int
     */
    public $status;

    /**
     * @var null|Handler
     */
    public $handler;

    /**
     * @var array
     */
    public $params = [];

    /**
     * Dispatches against the provided HTTP method verb and URI.
     *
     * @param array $array with one of the following formats:
     *
     *     [Dispatcher::NOT_FOUND]
     *     [Dispatcher::METHOD_NOT_ALLOWED, ['GET', 'OTHER_ALLOWED_METHODS']]
     *     [Dispatcher::FOUND, $handler, ['varName' => 'value', ...]]
     */
    public function __construct(array $array)
    {
        $this->status = $array[0];
        switch ($this->status) {
            case Dispatcher::METHOD_NOT_ALLOWED:
                $this->params = $array[1];
                break;
            case Dispatcher::FOUND:
                $this->handler = $array[1];
                $this->params = $array[2];
                break;
        }
    }

    public function isFound(): bool
    {
        return $this->status === Dispatcher::FOUND;
    }
}

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