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<?php namespace GuzzleHttp\Promise; /** * Get the global task queue used for promise resolution. * * This task queue MUST be run in an event loop in order for promises to be * settled asynchronously. It will be automatically run when synchronously * waiting on a promise. * * <code> * while ($eventLoop->isRunning()) { * GuzzleHttp\Promise\queue()->run(); * } * </code> * * @param TaskQueueInterface $assign Optionally specify a new queue instance. * * @return TaskQueueInterface */ function queue(TaskQueueInterface $assign = null) { static $queue; if ($assign) { $queue = $assign; } elseif (!$queue) { $queue = new TaskQueue(); } return $queue; } /** * Adds a function to run in the task queue when it is next `run()` and returns * a promise that is fulfilled or rejected with the result. * * @param callable $task Task function to run. * * @return PromiseInterface */ function task(callable $task) { $queue = queue(); $promise = new Promise([$queue, 'run']); $queue->add(function () use ($task, $promise) { try { $promise->resolve($task()); } catch (\Throwable $e) { $promise->reject($e); } catch (\Exception $e) { $promise->reject($e); } }); return $promise; } /** * Creates a promise for a value if the value is not a promise. * * @param mixed $value Promise or value. * * @return PromiseInterface */ function promise_for($value) { if ($value instanceof PromiseInterface) { return $value; } // Return a Guzzle promise that shadows the given promise. if (method_exists($value, 'then')) { $wfn = method_exists($value, 'wait') ? [$value, 'wait'] : null; $cfn = method_exists($value, 'cancel') ? [$value, 'cancel'] : null; $promise = new Promise($wfn, $cfn); $value->then([$promise, 'resolve'], [$promise, 'reject']); return $promise; } return new FulfilledPromise($value); } /** * Creates a rejected promise for a reason if the reason is not a promise. If * the provided reason is a promise, then it is returned as-is. * * @param mixed $reason Promise or reason. * * @return PromiseInterface */ function rejection_for($reason) { if ($reason instanceof PromiseInterface) { return $reason; } return new RejectedPromise($reason); } /** * Create an exception for a rejected promise value. * * @param mixed $reason * * @return \Exception|\Throwable */ function exception_for($reason) { return $reason instanceof \Exception || $reason instanceof \Throwable ? $reason : new RejectionException($reason); } /** * Returns an iterator for the given value. * * @param mixed $value * * @return \Iterator */ function iter_for($value) { if ($value instanceof \Iterator) { return $value; } elseif (is_array($value)) { return new \ArrayIterator($value); } else { return new \ArrayIterator([$value]); } } /** * Synchronously waits on a promise to resolve and returns an inspection state * array. * * Returns a state associative array containing a "state" key mapping to a * valid promise state. If the state of the promise is "fulfilled", the array * will contain a "value" key mapping to the fulfilled value of the promise. If * the promise is rejected, the array will contain a "reason" key mapping to * the rejection reason of the promise. * * @param PromiseInterface $promise Promise or value. * * @return array */ function inspect(PromiseInterface $promise) { try { return [ 'state' => PromiseInterface::FULFILLED, 'value' => $promise->wait() ]; } catch (RejectionException $e) { return ['state' => PromiseInterface::REJECTED, 'reason' => $e->getReason()]; } catch (\Throwable $e) { return ['state' => PromiseInterface::REJECTED, 'reason' => $e]; } catch (\Exception $e) { return ['state' => PromiseInterface::REJECTED, 'reason' => $e]; } } /** * Waits on all of the provided promises, but does not unwrap rejected promises * as thrown exception. * * Returns an array of inspection state arrays. * * @param PromiseInterface[] $promises Traversable of promises to wait upon. * * @return array * @see GuzzleHttp\Promise\inspect for the inspection state array format. */ function inspect_all($promises) { $results = []; foreach ($promises as $key => $promise) { $results[$key] = inspect($promise); } return $results; } /** * Waits on all of the provided promises and returns the fulfilled values. * * Returns an array that contains the value of each promise (in the same order * the promises were provided). An exception is thrown if any of the promises * are rejected. * * @param mixed $promises Iterable of PromiseInterface objects to wait on. * * @return array * @throws \Exception on error * @throws \Throwable on error in PHP >=7 */ function unwrap($promises) { $results = []; foreach ($promises as $key => $promise) { $results[$key] = $promise->wait(); } return $results; } /** * Given an array of promises, return a promise that is fulfilled when all the * items in the array are fulfilled. * * The promise's fulfillment value is an array with fulfillment values at * respective positions to the original array. If any promise in the array * rejects, the returned promise is rejected with the rejection reason. * * @param mixed $promises Promises or values. * * @return PromiseInterface */ function all($promises) { $results = []; return each( $promises, function ($value, $idx) use (&$results) { $results[$idx] = $value; }, function ($reason, $idx, Promise $aggregate) { $aggregate->reject($reason); } )->then(function () use (&$results) { ksort($results); return $results; }); } /** * Initiate a competitive race between multiple promises or values (values will * become immediately fulfilled promises). * * When count amount of promises have been fulfilled, the returned promise is * fulfilled with an array that contains the fulfillment values of the winners * in order of resolution. * * This prommise is rejected with a {@see GuzzleHttp\Promise\AggregateException} * if the number of fulfilled promises is less than the desired $count. * * @param int $count Total number of promises. * @param mixed $promises Promises or values. * * @return PromiseInterface */ function some($count, $promises) { $results = []; $rejections = []; return each( $promises, function ($value, $idx, PromiseInterface $p) use (&$results, $count) { if ($p->getState() !== PromiseInterface::PENDING) { return; } $results[$idx] = $value; if (count($results) >= $count) { $p->resolve(null); } }, function ($reason) use (&$rejections) { $rejections[] = $reason; } )->then( function () use (&$results, &$rejections, $count) { if (count($results) !== $count) { throw new AggregateException( 'Not enough promises to fulfill count', $rejections ); } ksort($results); return array_values($results); } ); } /** * Like some(), with 1 as count. However, if the promise fulfills, the * fulfillment value is not an array of 1 but the value directly. * * @param mixed $promises Promises or values. * * @return PromiseInterface */ function any($promises) { return some(1, $promises)->then(function ($values) { return $values[0]; }); } /** * Returns a promise that is fulfilled when all of the provided promises have * been fulfilled or rejected. * * The returned promise is fulfilled with an array of inspection state arrays. * * @param mixed $promises Promises or values. * * @return PromiseInterface * @see GuzzleHttp\Promise\inspect for the inspection state array format. */ function settle($promises) { $results = []; return each( $promises, function ($value, $idx) use (&$results) { $results[$idx] = ['state' => PromiseInterface::FULFILLED, 'value' => $value]; }, function ($reason, $idx) use (&$results) { $results[$idx] = ['state' => PromiseInterface::REJECTED, 'reason' => $reason]; } )->then(function () use (&$results) { ksort($results); return $results; }); } /** * Given an iterator that yields promises or values, returns a promise that is * fulfilled with a null value when the iterator has been consumed or the * aggregate promise has been fulfilled or rejected. * * $onFulfilled is a function that accepts the fulfilled value, iterator * index, and the aggregate promise. The callback can invoke any necessary side * effects and choose to resolve or reject the aggregate promise if needed. * * $onRejected is a function that accepts the rejection reason, iterator * index, and the aggregate promise. The callback can invoke any necessary side * effects and choose to resolve or reject the aggregate promise if needed. * * @param mixed $iterable Iterator or array to iterate over. * @param callable $onFulfilled * @param callable $onRejected * * @return PromiseInterface */ function each( $iterable, callable $onFulfilled = null, callable $onRejected = null ) { return (new EachPromise($iterable, [ 'fulfilled' => $onFulfilled, 'rejected' => $onRejected ]))->promise(); } /** * Like each, but only allows a certain number of outstanding promises at any * given time. * * $concurrency may be an integer or a function that accepts the number of * pending promises and returns a numeric concurrency limit value to allow for * dynamic a concurrency size. * * @param mixed $iterable * @param int|callable $concurrency * @param callable $onFulfilled * @param callable $onRejected * * @return PromiseInterface */ function each_limit( $iterable, $concurrency, callable $onFulfilled = null, callable $onRejected = null ) { return (new EachPromise($iterable, [ 'fulfilled' => $onFulfilled, 'rejected' => $onRejected, 'concurrency' => $concurrency ]))->promise(); } /** * Like each_limit, but ensures that no promise in the given $iterable argument * is rejected. If any promise is rejected, then the aggregate promise is * rejected with the encountered rejection. * * @param mixed $iterable * @param int|callable $concurrency * @param callable $onFulfilled * * @return PromiseInterface */ function each_limit_all( $iterable, $concurrency, callable $onFulfilled = null ) { return each_limit( $iterable, $concurrency, $onFulfilled, function ($reason, $idx, PromiseInterface $aggregate) { $aggregate->reject($reason); } ); } /** * Returns true if a promise is fulfilled. * * @param PromiseInterface $promise * * @return bool */ function is_fulfilled(PromiseInterface $promise) { return $promise->getState() === PromiseInterface::FULFILLED; } /** * Returns true if a promise is rejected. * * @param PromiseInterface $promise * * @return bool */ function is_rejected(PromiseInterface $promise) { return $promise->getState() === PromiseInterface::REJECTED; } /** * Returns true if a promise is fulfilled or rejected. * * @param PromiseInterface $promise * * @return bool */ function is_settled(PromiseInterface $promise) { return $promise->getState() !== PromiseInterface::PENDING; } /** * @see Coroutine * * @param callable $generatorFn * * @return PromiseInterface */ function coroutine(callable $generatorFn) { return new Coroutine($generatorFn); }
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