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<?php |
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namespace Xoops\Frame; |
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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 Xoops\Frame\Exception\InvalidHandlerException; |
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use Xoops\Frame\Exception\RackExhaustedException; |
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/** |
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* Class Rack |
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* |
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* @package Xoops\Xadr |
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*/ |
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class Rack implements MiddlewareInterface, RequestHandlerInterface |
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{ |
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/** @var \SplQueue */ |
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protected $workQueue; |
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/** |
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* Rack constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->workQueue = new \SplQueue(); |
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} |
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/** |
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* Add ServerMiddleware to the queue |
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* |
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* @param MiddlewareInterface $middleware |
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* |
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* @return self |
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* |
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* @throws InvalidHandlerException |
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*/ |
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public function add(MiddlewareInterface $middleware): Rack |
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{ |
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if ($this === $middleware) { |
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throw new InvalidHandlerException('Cannot register a Rack instance as its own middleware'); |
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} |
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$this->workQueue->enqueue($middleware); |
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return $this; |
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} |
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/** |
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* Handle the request and return a response |
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* |
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* @param ServerRequestInterface $request an Http Request |
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* |
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* @return ResponseInterface |
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* |
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* @throws InvalidHandlerException |
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* @throws RackExhaustedException |
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*/ |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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try { |
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$handler = $this->workQueue->dequeue(); |
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if (!($handler instanceof MiddlewareInterface)) { |
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throw new InvalidHandlerException('Invalid Handler in Rack queue'); |
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} |
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return $handler->process($request, $this); |
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} catch (\RuntimeException $e) { |
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throw new RackExhaustedException('Rack exhausted', 0, $e); |
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} |
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} |
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/** |
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* Process an incoming server request and return a response, optionally delegating |
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* response creation to a handler. |
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* |
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* Here, we will use our own workQueue to try to handle the request, allowing stacking of |
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* Rack instances in a middleware queue (i.e a Rack of Racks) |
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* |
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* @param ServerRequestInterface $request an Http Request |
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* @param RequestHandlerInterface $handler |
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* |
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* @return ResponseInterface |
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* |
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* @throws InvalidHandlerException |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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try { |
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return $this->handle($request); |
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} catch (RackExhaustedException $e) { |
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// this rack didn't handle it, delegate it |
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return $handler->handle($request); |
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} |
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} |
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/** |
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* Process a request using the middleware that has been add()ed to the Rack |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return ResponseInterface |
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* |
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* @throws InvalidHandlerException |
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* @throws RackExhaustedException |
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*/ |
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public function run(ServerRequestInterface $request): ResponseInterface |
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{ |
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return $this->handle($request); |
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} |
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/** |
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* __invoke() is an alias for run() |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return ResponseInterface |
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* |
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* @throws InvalidHandlerException |
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* @throws RackExhaustedException |
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*/ |
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public function __invoke(ServerRequestInterface $request): ResponseInterface |
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{ |
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return $this->run($request); |
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} |
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} |
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XOOPS /
Frame
