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<?php |
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namespace Http\Adapter\React; |
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use React\EventLoop\LoopInterface; |
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use Http\Client\Exception; |
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use Http\Promise\Promise as HttpPromise; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* React promise adapter implementation. |
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* |
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* @author Stéphane Hulard <[email protected]> |
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* |
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* @internal |
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*/ |
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final class Promise implements HttpPromise |
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{ |
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/** |
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* Promise status. |
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* |
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* @var string |
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*/ |
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private $state = HttpPromise::PENDING; |
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/** |
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* PSR7 received response. |
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* |
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* @var ResponseInterface |
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*/ |
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private $response; |
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/** |
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* Execution error. |
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* |
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* @var Exception |
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*/ |
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private $exception; |
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/** |
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* @var callable|null |
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*/ |
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private $onFulfilled; |
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/** |
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* @var callable|null |
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*/ |
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private $onRejected; |
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/** |
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* React Event Loop used for synchronous processing. |
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* |
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* @var LoopInterface |
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*/ |
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private $loop; |
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public function __construct(LoopInterface $loop) |
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{ |
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$this->loop = $loop; |
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} |
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/** |
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* Allow to apply callable when the promise resolve. |
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* |
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* @param callable|null $onFulfilled |
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* @param callable|null $onRejected |
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* |
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* @return Promise |
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*/ |
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public function then(callable $onFulfilled = null, callable $onRejected = null) |
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{ |
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$newPromise = new self($this->loop); |
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$onFulfilled = $onFulfilled !== null ? $onFulfilled : function (ResponseInterface $response) { |
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return $response; |
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}; |
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$onRejected = $onRejected !== null ? $onRejected : function (Exception $exception) { |
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throw $exception; |
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}; |
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$this->onFulfilled = function (ResponseInterface $response) use ($onFulfilled, $newPromise) { |
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try { |
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$newPromise->resolve($onFulfilled($response)); |
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} catch (Exception $exception) { |
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$newPromise->reject($exception); |
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} |
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}; |
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$this->onRejected = function (Exception $exception) use ($onRejected, $newPromise) { |
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try { |
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$newPromise->resolve($onRejected($exception)); |
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} catch (Exception $exception) { |
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$newPromise->reject($exception); |
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} |
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}; |
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if ($this->state === HttpPromise::FULFILLED) { |
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$this->doResolve($this->response); |
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} |
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if ($this->state === HttpPromise::REJECTED) { |
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$this->doReject($this->exception); |
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} |
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return $newPromise; |
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} |
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/** |
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* Resolve this promise. |
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* |
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* @param ResponseInterface $response |
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* |
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* @internal |
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*/ |
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public function resolve(ResponseInterface $response) |
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{ |
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if ($this->state !== HttpPromise::PENDING) { |
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throw new \RuntimeException('Promise is already resolved'); |
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} |
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$this->state = HttpPromise::FULFILLED; |
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$this->response = $response; |
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$this->doResolve($response); |
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} |
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private function doResolve(ResponseInterface $response) |
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{ |
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$onFulfilled = $this->onFulfilled; |
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if (null !== $onFulfilled) { |
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$onFulfilled($response); |
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} |
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} |
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/** |
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* Reject this promise. |
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* |
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* @param Exception $exception |
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* |
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* @internal |
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*/ |
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public function reject(Exception $exception) |
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{ |
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if ($this->state !== HttpPromise::PENDING) { |
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throw new \RuntimeException('Promise is already resolved'); |
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} |
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$this->state = HttpPromise::REJECTED; |
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$this->exception = $exception; |
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$this->doReject($exception); |
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} |
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private function doReject(Exception $exception) |
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{ |
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$onRejected = $this->onRejected; |
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if (null !== $onRejected) { |
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$onRejected($exception); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getState() |
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{ |
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return $this->state; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function wait($unwrap = true) |
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{ |
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while (HttpPromise::PENDING === $this->getState()) { |
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$this->loop->tick(); |
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} |
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if ($unwrap) { |
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if (HttpPromise::REJECTED == $this->getState()) { |
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throw $this->exception; |
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} |
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return $this->response; |
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} |
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} |
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} |
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This check looks from parameters that have been defined for a function or method, but which are not used in the method body.