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<?php |
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declare(strict_types=1); |
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namespace Spiral\Http; |
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use Psr\EventDispatcher\EventDispatcherInterface; |
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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\Attribute\Proxy; |
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use Spiral\Core\ContainerScope; |
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use Spiral\Core\ScopeInterface; |
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use Spiral\Http\Event\MiddlewareProcessing; |
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use Spiral\Http\Exception\PipelineException; |
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use Spiral\Http\Traits\MiddlewareTrait; |
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use Spiral\Telemetry\NullTracer; |
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use Spiral\Telemetry\SpanInterface; |
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use Spiral\Telemetry\TracerInterface; |
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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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private int $position = 0; |
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private readonly TracerInterface $tracer; |
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private ?RequestHandlerInterface $handler = null; |
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public function __construct( |
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#[Proxy] private readonly ScopeInterface $scope, |
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private readonly ?EventDispatcherInterface $dispatcher = null, |
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?TracerInterface $tracer = null |
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) { |
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$this->tracer = $tracer ?? new NullTracer($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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* @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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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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public function handle(Request $request): Response |
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{ |
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if ($this->handler === null) { |
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throw new PipelineException('Unable to run pipeline, no handler given.'); |
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} |
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// todo: find a better solution in the Spiral v4.0 |
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/** @var CurrentRequest|null $currentRequest */ |
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$currentRequest = ContainerScope::getContainer()?->get(CurrentRequest::class); |
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$previousRequest = $currentRequest?->get(); |
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$currentRequest?->set($request); |
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try { |
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$position = $this->position++; |
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if (!isset($this->middleware[$position])) { |
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return $this->handler->handle($request); |
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} |
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$middleware = $this->middleware[$position]; |
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$this->dispatcher?->dispatch(new MiddlewareProcessing($request, $middleware)); |
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$callback = function (SpanInterface $span) use ($request, $middleware): Response { |
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$response = $middleware->process($request, $this); |
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$span |
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->setAttribute( |
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'http.status_code', |
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$response->getStatusCode() |
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) |
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->setAttribute( |
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'http.response_content_length', |
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$response->getHeaderLine('Content-Length') ?: $response->getBody()->getSize() |
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) |
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->setStatus($response->getStatusCode() < 500 ? 'OK' : 'ERROR'); |
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return $response; |
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}; |
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return $this->tracer->trace( |
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name: \sprintf('Middleware processing [%s]', $middleware::class), |
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callback: $callback, |
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attributes: [ |
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'http.middleware' => $middleware::class, |
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], |
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scoped: true |
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); |
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} finally { |
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if ($previousRequest !== null) { |
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$currentRequest?->set($previousRequest); |
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} |
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} |
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} |
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} |
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spiral /
framework
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