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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Middleware\Dispatcher; |
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use Psr\EventDispatcher\EventDispatcherInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use Yiisoft\Middleware\Dispatcher\Event\AfterMiddleware; |
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use Yiisoft\Middleware\Dispatcher\Event\BeforeMiddleware; |
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final class MiddlewareStack implements MiddlewareStackInterface |
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{ |
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/** |
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* Contains a stack of middleware wrapped in handlers. |
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* Each handler points to the handler of middleware that will be processed next. |
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* |
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* @var RequestHandlerInterface|null stack of middleware |
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*/ |
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private ?RequestHandlerInterface $stack = null; |
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private EventDispatcherInterface $eventDispatcher; |
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public function __construct(EventDispatcherInterface $eventDispatcher) |
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{ |
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$this->eventDispatcher = $eventDispatcher; |
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} |
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public function build(array $middlewares, RequestHandlerInterface $fallbackHandler): MiddlewareStackInterface |
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{ |
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$handler = $fallbackHandler; |
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foreach ($middlewares as $middleware) { |
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$handler = $this->wrap($middleware, $handler); |
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} |
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$new = clone $this; |
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$new->stack = $handler; |
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return $new; |
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} |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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if ($this->isEmpty()) { |
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throw new \RuntimeException('Stack is empty.'); |
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} |
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return $this->stack->handle($request); |
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} |
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public function reset(): void |
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{ |
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$this->stack = null; |
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} |
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public function isEmpty(): bool |
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{ |
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return $this->stack === null; |
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} |
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/** |
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* Wraps handler by middlewares |
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*/ |
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private function wrap(MiddlewareInterface $middleware, RequestHandlerInterface $handler): RequestHandlerInterface |
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{ |
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return new class($middleware, $handler, $this->eventDispatcher) implements RequestHandlerInterface { |
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private MiddlewareInterface $middleware; |
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private RequestHandlerInterface $handler; |
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private EventDispatcherInterface $eventDispatcher; |
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public function __construct(MiddlewareInterface $middleware, RequestHandlerInterface $handler, EventDispatcherInterface $eventDispatcher) |
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{ |
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$this->middleware = $middleware; |
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$this->handler = $handler; |
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$this->eventDispatcher = $eventDispatcher; |
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} |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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$this->eventDispatcher->dispatch(new BeforeMiddleware($this->middleware, $request)); |
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$response = null; |
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try { |
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return $response = $this->middleware->process($request, $this->handler); |
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} finally { |
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$this->eventDispatcher->dispatch(new AfterMiddleware($this->middleware, $response)); |
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} |
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} |
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}; |
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} |
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} |
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yiisoft /
middleware-dispatcher
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