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<?php |
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namespace Cormy\Server; |
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use Generator; |
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use Throwable; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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/** |
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* Bamboo style PSR-7 middleware pipe. |
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*/ |
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class Bamboo implements MiddlewareInterface |
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{ |
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/** |
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* @var (callable|MiddlewareInterface)[] |
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*/ |
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protected $nodes = []; |
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/** |
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* Bamboo style PSR-7 middleware pipe. |
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* |
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* @param (callable|MiddlewareInterface)[] $nodes the middlewares, which requests pass through |
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*/ |
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public function __construct(array $nodes) |
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{ |
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array_map([$this, 'push'], $nodes); |
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} |
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/** |
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* Push a middleware onto the end of $nodes type safe. |
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* |
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* @param callable|MiddlewareInterface $middleware |
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*/ |
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private function push(callable $middleware) |
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{ |
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$this->nodes[] = $middleware; |
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} |
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/** |
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* Process an incoming server request and return the response. |
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* |
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* @param ServerRequestInterface $request |
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* @param callable|RequestHandlerInterface $finalHandler |
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* |
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* @return ResponseInterface |
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*/ |
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public function dispatch(ServerRequestInterface $request, callable $finalHandler):ResponseInterface |
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{ |
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$dispatcher = new MiddlewareDispatcher($this, $finalHandler); |
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return $dispatcher($request); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function __invoke(ServerRequestInterface $request):Generator |
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{ |
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return $this->processMiddleware(0, $request); |
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} |
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/** |
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* Process an incoming server request by delegating it to the middleware specified by $index. |
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* |
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* @param int $index the $nodes index |
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* @param ServerRequestInterface $request |
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* |
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* @return Generator |
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*/ |
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protected function processMiddleware(int $index, ServerRequestInterface $request):Generator |
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{ |
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if (!array_key_exists($index, $this->nodes)) { |
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$response = (yield $request); |
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return $response; |
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} |
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$current = $this->nodes[$index]($request); |
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$nextIndex = $index + 1; |
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while ($current->valid()) { |
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$nextRequest = $current->current(); |
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try { |
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$nextResponse = yield from $this->processMiddleware($nextIndex, $nextRequest); |
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$current->send($nextResponse); |
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} catch (Throwable $exception) { |
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$current->throw($exception); |
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} |
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} |
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return $current->getReturn(); |
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} |
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} |
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cormy /
bamboo
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