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<?php |
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declare(strict_types=1); |
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namespace Antidot\React; |
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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 React\EventLoop\LoopInterface; |
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use React\Promise\Promise; |
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use React\Promise\PromiseInterface; |
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use Recoil\React\ReactKernel; |
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use Throwable; |
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use function React\Promise\resolve; |
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final class MiddlewarePipeline implements CallablePipeline |
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{ |
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private array $middleware; |
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private ReactKernel $kernel; |
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public function __construct(LoopInterface $loop) |
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{ |
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$this->kernel = ReactKernel::create($loop); |
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$this->middleware = []; |
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} |
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public function pipe(MiddlewareInterface $middleware): void |
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{ |
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$func = static function ($middleware) { |
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return $middleware; |
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}; |
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$this->middleware[] = $func($middleware); |
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} |
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public function __invoke(ServerRequestInterface $request, callable $next): PromiseInterface |
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{ |
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$stack = $this->createStack($next); |
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$kernel = $this->kernel; |
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return new Promise(static function ($resolve, $reject) use ($kernel, $request, $next, $stack) { |
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$kernel->execute(static function () use ($resolve, $reject, $request, $next, $stack) { |
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try { |
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$response = $stack($request, $next); |
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if ($response instanceof ResponseInterface) { |
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$response = resolve($response); |
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} |
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$response = (yield $response); |
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$resolve($response); |
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} catch (Throwable $throwable) { |
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$reject($throwable); |
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} |
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}); |
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}); |
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} |
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private function createStack($next): callable |
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{ |
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$stack = static function (ServerRequestInterface $request) use ($next) { |
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$response = $next($request); |
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if ($response instanceof ResponseInterface) { |
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$response = resolve($response); |
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} |
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return (yield $response); |
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}; |
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$middleware = $this->middleware; |
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$middleware = array_reverse($middleware); |
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foreach ($middleware as $mw) { |
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$mwh = clone $mw; |
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$stack = static function (ServerRequestInterface $request) use ($stack, $mwh) { |
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$response = $mwh->process($request, new PassThroughRequestHandler($stack)); |
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if ($response instanceof ResponseInterface) { |
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$response = resolve($response); |
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} |
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return (yield $response); |
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}; |
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} |
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return $stack; |
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} |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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return new PromiseResponse(resolve(clone $this)->then(fn($next) => $this->__invoke($request, $next))); |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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return new PromiseResponse(resolve(static function ($handler) { |
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return $handler; |
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})->then(fn($func) => $this->__invoke($request, $func($handler)))); |
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} |
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} |
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antidot-framework /
react-http-server
