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<?php namespace GuzzleHttp\Promise; use Exception; use Generator; use Throwable; /** * Creates a promise that is resolved using a generator that yields values or * promises (somewhat similar to C#'s async keyword). * * When called, the coroutine function will start an instance of the generator * and returns a promise that is fulfilled with its final yielded value. * * Control is returned back to the generator when the yielded promise settles. * This can lead to less verbose code when doing lots of sequential async calls * with minimal processing in between. * * use GuzzleHttp\Promise; * * function createPromise($value) { * return new Promise\FulfilledPromise($value); * } * * $promise = Promise\coroutine(function () { * $value = (yield createPromise('a')); * try { * $value = (yield createPromise($value . 'b')); * } catch (\Exception $e) { * // The promise was rejected. * } * yield $value . 'c'; * }); * * // Outputs "abc" * $promise->then(function ($v) { echo $v; }); * * @param callable $generatorFn Generator function to wrap into a promise. * * @return Promise * @link https://github.com/petkaantonov/bluebird/blob/master/API.md#generators inspiration */ final class Coroutine implements PromiseInterface { /** * @var PromiseInterface|null */ private $currentPromise; /** * @var Generator */ private $generator; /** * @var Promise */ private $result; public function __construct(callable $generatorFn) { $this->generator = $generatorFn(); $this->result = new Promise(function () { while (isset($this->currentPromise)) { $this->currentPromise->wait(); } }); $this->nextCoroutine($this->generator->current()); } public function then( callable $onFulfilled = null, callable $onRejected = null ) { return $this->result->then($onFulfilled, $onRejected); } public function otherwise(callable $onRejected) { return $this->result->otherwise($onRejected); } public function wait($unwrap = true) { return $this->result->wait($unwrap); } public function getState() { return $this->result->getState(); } public function resolve($value) { $this->result->resolve($value); } public function reject($reason) { $this->result->reject($reason); } public function cancel() { $this->currentPromise->cancel(); $this->result->cancel(); } private function nextCoroutine($yielded) { $this->currentPromise = promise_for($yielded) ->then([$this, '_handleSuccess'], [$this, '_handleFailure']); } /** * @internal */ public function _handleSuccess($value) { unset($this->currentPromise); try { $next = $this->generator->send($value); if ($this->generator->valid()) { $this->nextCoroutine($next); } else { $this->result->resolve($value); } } catch (Exception $exception) { $this->result->reject($exception); } catch (Throwable $throwable) { $this->result->reject($throwable); } } /** * @internal */ public function _handleFailure($reason) { unset($this->currentPromise); try { $nextYield = $this->generator->throw(exception_for($reason)); // The throw was caught, so keep iterating on the coroutine $this->nextCoroutine($nextYield); } catch (Exception $exception) { $this->result->reject($exception); } catch (Throwable $throwable) { $this->result->reject($throwable); } } }
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