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| 1 | +<?php |
| 2 | + |
| 3 | +declare(strict_types=1); |
| 4 | + |
| 5 | +namespace Antidot\React; |
| 6 | + |
| 7 | +use Antidot\Application\Http\Handler\NextHandler; |
| 8 | +use Antidot\Application\Http\Middleware\Pipeline; |
| 9 | +use Psr\Http\Message\ResponseInterface; |
| 10 | +use Psr\Http\Message\ServerRequestInterface; |
| 11 | +use Psr\Http\Server\MiddlewareInterface; |
| 12 | +use Psr\Http\Server\RequestHandlerInterface; |
| 13 | +use Ramsey\Uuid\Uuid; |
| 14 | +use SplQueue; |
| 15 | +use Throwable; |
| 16 | +use function React\Promise\reject; |
| 17 | +use function React\Promise\resolve; |
| 18 | + |
| 19 | +class MiddlewarePipeline implements Pipeline |
| 20 | +{ |
| 21 | + /** @var array<SplQueue> */ |
| 22 | + public array $concurrentPipelines; |
| 23 | + /** @var array<MiddlewareInterface> */ |
| 24 | + private array $middlewareCollection; |
| 25 | + |
| 26 | + /** |
| 27 | + * @param array<MiddlewareInterface> $middlewareCollection |
| 28 | + * @param array<SplQueue> $concurrentPipelines |
| 29 | + */ |
| 30 | + public function __construct( |
| 31 | + array $middlewareCollection = [], |
| 32 | + array $concurrentPipelines = [] |
| 33 | + ) { |
| 34 | + $this->concurrentPipelines = $concurrentPipelines; |
| 35 | + $this->middlewareCollection = $middlewareCollection; |
| 36 | + } |
| 37 | + |
| 38 | + public function pipe(MiddlewareInterface $middleware): void |
| 39 | + { |
| 40 | + $this->middlewareCollection[] = $middleware; |
| 41 | + } |
| 42 | + |
| 43 | + public function handle(ServerRequestInterface $request): ResponseInterface |
| 44 | + { |
| 45 | + /** @var string $requestId */ |
| 46 | + $requestId = $request->getAttribute('request_id'); |
| 47 | + $this->setCurrentPipeline($requestId); |
| 48 | + |
| 49 | + return new PromiseResponse(resolve($request)->then( |
| 50 | + function (ServerRequestInterface $request) { |
| 51 | + /** @var string $requestId */ |
| 52 | + $requestId = $request->getAttribute('request_id'); |
| 53 | + try { |
| 54 | + /** @var MiddlewareInterface $middleware */ |
| 55 | + $middleware = $this->concurrentPipelines[$requestId]->dequeue(); |
| 56 | + |
| 57 | + $response = $middleware->process($request, $this); |
| 58 | + unset($this->concurrentPipelines[$requestId]); |
| 59 | + |
| 60 | + return resolve($response); |
| 61 | + } catch (Throwable $exception) { |
| 62 | + unset($this->concurrentPipelines[$requestId]); |
| 63 | + |
| 64 | + return reject($exception); |
| 65 | + } |
| 66 | + } |
| 67 | + )); |
| 68 | + } |
| 69 | + |
| 70 | + public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
| 71 | + { |
| 72 | + /** @var ?string $requestId */ |
| 73 | + $requestId = $request->getAttribute('request_id'); |
| 74 | + if (!$requestId) { |
| 75 | + $requestId = Uuid::uuid4()->toString(); |
| 76 | + $request = $request->withAttribute('request_id', $requestId); |
| 77 | + } |
| 78 | + $this->setCurrentPipeline($requestId); |
| 79 | + |
| 80 | + return new PromiseResponse(resolve($request) |
| 81 | + ->then(function (ServerRequestInterface $request) use ($handler) { |
| 82 | + /** @var string $requestId */ |
| 83 | + $requestId = $request->getAttribute('request_id'); |
| 84 | + try { |
| 85 | + /** @var SplQueue<MiddlewareInterface> $queue */ |
| 86 | + $queue = $this->concurrentPipelines[$requestId]; |
| 87 | + $next = new NextHandler($queue, $handler); |
| 88 | + |
| 89 | + return resolve($next->handle($request)); |
| 90 | + } catch (Throwable $exception) { |
| 91 | + unset($this->concurrentPipelines[$requestId]); |
| 92 | + |
| 93 | + return reject($exception); |
| 94 | + } |
| 95 | + })); |
| 96 | + } |
| 97 | + |
| 98 | + private function setCurrentPipeline(string $requestId): void |
| 99 | + { |
| 100 | + if (empty($this->concurrentPipelines[$requestId])) { |
| 101 | + $queue = new SplQueue(); |
| 102 | + foreach ($this->middlewareCollection as $middlewareName) { |
| 103 | + $queue->enqueue($middlewareName); |
| 104 | + } |
| 105 | + $this->concurrentPipelines[$requestId] = $queue; |
| 106 | + } |
| 107 | + } |
| 108 | +} |
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