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<?php |
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/** |
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* Spiral Framework. |
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* |
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* @license MIT |
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* @author Anton Titov (Wolfy-J) |
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*/ |
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declare(strict_types=1); |
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namespace Spiral\Http; |
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use Psr\Http\Message\ResponseInterface as Response; |
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use Psr\Http\Message\ServerRequestInterface as Request; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use Spiral\Core\ScopeInterface; |
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use Spiral\Http\Exception\PipelineException; |
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use Spiral\Http\Traits\MiddlewareTrait; |
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/** |
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* Pipeline used to pass request and response thought the chain of middleware. |
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*/ |
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final class Pipeline implements RequestHandlerInterface, MiddlewareInterface |
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{ |
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use MiddlewareTrait; |
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/** @var ScopeInterface */ |
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private $scope; |
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/** @var int */ |
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private $position = 0; |
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/** @var RequestHandlerInterface */ |
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private $handler; |
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/** |
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* @param ScopeInterface $scope |
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*/ |
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public function __construct(ScopeInterface $scope) |
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{ |
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$this->scope = $scope; |
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} |
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/** |
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* Configures pipeline with target endpoint. |
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* |
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* @param RequestHandlerInterface $handler |
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* @return Pipeline |
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* |
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* @throws PipelineException |
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*/ |
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public function withHandler(RequestHandlerInterface $handler): self |
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{ |
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$pipeline = clone $this; |
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$pipeline->handler = $handler; |
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$pipeline->position = 0; |
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return $pipeline; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function process(Request $request, RequestHandlerInterface $handler): Response |
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{ |
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return $this->withHandler($handler)->handle($request); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function handle(Request $request): Response |
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{ |
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if (empty($this->handler)) { |
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throw new PipelineException('Unable to run pipeline, no handler given.'); |
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} |
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$position = $this->position++; |
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if (isset($this->middleware[$position])) { |
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return $this->middleware[$position]->process($request, $this); |
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} |
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return $this->scope->runScope([Request::class => $request], function () use ($request) { |
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return $this->handler->handle($request); |
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}); |
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} |
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} |
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spiral /
framework
