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<?php
namespace GuzzleHttp;
use GuzzleHttp\Event\BeforeEvent;
use GuzzleHttp\Event\RequestEvents;
use GuzzleHttp\Message\RequestInterface;
use GuzzleHttp\Message\ResponseInterface;
use GuzzleHttp\Ring\Core;
use GuzzleHttp\Ring\Future\FutureInterface;
use GuzzleHttp\Event\ListenerAttacherTrait;
use GuzzleHttp\Event\EndEvent;
use React\Promise\Deferred;
use React\Promise\FulfilledPromise;
use React\Promise\PromiseInterface;
use React\Promise\RejectedPromise;
/**
* Sends and iterator of requests concurrently using a capped pool size.
*
* The Pool object implements FutureInterface, meaning it can be used later
* when necessary, the requests provided to the pool can be cancelled, and
* you can check the state of the pool to know if it has been dereferenced
* (sent) or has been cancelled.
*
* When sending the pool, keep in mind that no results are returned: callers
* are expected to handle results asynchronously using Guzzle's event system.
* When requests complete, more are added to the pool to ensure that the
* requested pool size is always filled as much as possible.
*
* IMPORTANT: Do not provide a pool size greater that what the utilized
* underlying RingPHP handler can support. This will result is extremely poor
* performance.
*/
class Pool implements FutureInterface
{
use ListenerAttacherTrait;
/** @var \GuzzleHttp\ClientInterface */
private $client;
/** @var \Iterator Yields requests */
private $iter;
/** @var Deferred */
private $deferred;
/** @var PromiseInterface */
private $promise;
private $waitQueue = [];
private $eventListeners = [];
private $poolSize;
private $isRealized = false;
/**
* The option values for 'before', 'complete', 'error' and 'end' can be a
* callable, an associative array containing event data, or an array of
* event data arrays. Event data arrays contain the following keys:
*
* - fn: callable to invoke that receives the event
* - priority: Optional event priority (defaults to 0)
* - once: Set to true so that the event is removed after it is triggered
*
* @param ClientInterface $client Client used to send the requests.
* @param array|\Iterator $requests Requests to send in parallel
* @param array $options Associative array of options
* - pool_size: (callable|int) Maximum number of requests to send
* concurrently, or a callback that receives
* the current queue size and returns the
* number of new requests to send
* - before: (callable|array) Receives a BeforeEvent
* - complete: (callable|array) Receives a CompleteEvent
* - error: (callable|array) Receives a ErrorEvent
* - end: (callable|array) Receives an EndEvent
*/
public function __construct(
ClientInterface $client,
$requests,
array $options = []
) {
$this->client = $client;
$this->iter = $this->coerceIterable($requests);
$this->deferred = new Deferred();
$this->promise = $this->deferred->promise();
$this->poolSize = isset($options['pool_size'])
? $options['pool_size'] : 25;
$this->eventListeners = $this->prepareListeners(
$options,
['before', 'complete', 'error', 'end']
);
}
/**
* Sends multiple requests in parallel and returns an array of responses
* and exceptions that uses the same ordering as the provided requests.
*
* IMPORTANT: This method keeps every request and response in memory, and
* as such, is NOT recommended when sending a large number or an
* indeterminate number of requests concurrently.
*
* @param ClientInterface $client Client used to send the requests
* @param array|\Iterator $requests Requests to send in parallel
* @param array $options Passes through the options available in
* {@see GuzzleHttp\Pool::__construct}
*
* @return BatchResults Returns a container for the results.
* @throws \InvalidArgumentException if the event format is incorrect.
*/
public static function batch(
ClientInterface $client,
$requests,
array $options = []
) {
$hash = new \SplObjectStorage();
foreach ($requests as $request) {
$hash->attach($request);
}
// In addition to the normally run events when requests complete, add
// and event to continuously track the results of transfers in the hash.
(new self($client, $requests, RequestEvents::convertEventArray(
$options,
['end'],
[
'priority' => RequestEvents::LATE,
'fn' => function (EndEvent $e) use ($hash) {
$hash[$e->getRequest()] = $e->getException()
? $e->getException()
: $e->getResponse();
}
]
)))->wait();
return new BatchResults($hash);
}
/**
* Creates a Pool and immediately sends the requests.
*
* @param ClientInterface $client Client used to send the requests
* @param array|\Iterator $requests Requests to send in parallel
* @param array $options Passes through the options available in
* {@see GuzzleHttp\Pool::__construct}
*/
public static function send(
ClientInterface $client,
$requests,
array $options = []
) {
$pool = new self($client, $requests, $options);
$pool->wait();
}
private function getPoolSize()
{
return is_callable($this->poolSize)
? call_user_func($this->poolSize, count($this->waitQueue))
: $this->poolSize;
}
/**
* Add as many requests as possible up to the current pool limit.
*/
private function addNextRequests()
{
$limit = max($this->getPoolSize() - count($this->waitQueue), 0);
while ($limit--) {
if (!$this->addNextRequest()) {
break;
}
}
}
public function wait()
{
if ($this->isRealized) {
return false;
}
// Seed the pool with N number of requests.
$this->addNextRequests();
// Stop if the pool was cancelled while transferring requests.
if ($this->isRealized) {
return false;
}
// Wait on any outstanding FutureResponse objects.
while ($response = array_pop($this->waitQueue)) {
try {
$response->wait();
} catch (\Exception $e) {
// Eat exceptions because they should be handled asynchronously
}
$this->addNextRequests();
}
// Clean up no longer needed state.
$this->isRealized = true;
$this->waitQueue = $this->eventListeners = [];
$this->client = $this->iter = null;
$this->deferred->resolve(true);
return true;
}
/**
* {@inheritdoc}
*
* Attempt to cancel all outstanding requests (requests that are queued for
* dereferencing). Returns true if all outstanding requests can be
* cancelled.
*
* @return bool
*/
public function cancel()
{
if ($this->isRealized) {
return false;
}
$success = $this->isRealized = true;
foreach ($this->waitQueue as $response) {
if (!$response->cancel()) {
$success = false;
}
}
return $success;
}
/**
* Returns a promise that is invoked when the pool completed. There will be
* no passed value.
*
* {@inheritdoc}
*/
public function then(
callable $onFulfilled = null,
callable $onRejected = null,
callable $onProgress = null
) {
return $this->promise->then($onFulfilled, $onRejected, $onProgress);
}
public function promise()
{
return $this->promise;
}
private function coerceIterable($requests)
{
if ($requests instanceof \Iterator) {
return $requests;
} elseif (is_array($requests)) {
return new \ArrayIterator($requests);
}
throw new \InvalidArgumentException('Expected Iterator or array. '
. 'Found ' . Core::describeType($requests));
}
/**
* Adds the next request to pool and tracks what requests need to be
* dereferenced when completing the pool.
*/
private function addNextRequest()
{
add_next:
if ($this->isRealized || !$this->iter || !$this->iter->valid()) {
return false;
}
$request = $this->iter->current();
$this->iter->next();
if (!($request instanceof RequestInterface)) {
throw new \InvalidArgumentException(sprintf(
'All requests in the provided iterator must implement '
. 'RequestInterface. Found %s',
Core::describeType($request)
));
}
// Be sure to use "lazy" futures, meaning they do not send right away.
$request->getConfig()->set('future', 'lazy');
$hash = spl_object_hash($request);
$this->attachListeners($request, $this->eventListeners);
$request->getEmitter()->on('before', [$this, '_trackRetries'], RequestEvents::EARLY);
$response = $this->client->send($request);
$this->waitQueue[$hash] = $response;
$promise = $response->promise();
// Don't recursively call itself for completed or rejected responses.
if ($promise instanceof FulfilledPromise
|| $promise instanceof RejectedPromise
) {
try {
$this->finishResponse($request, $response->wait(), $hash);
} catch (\Exception $e) {
$this->finishResponse($request, $e, $hash);
}
goto add_next;
}
// Use this function for both resolution and rejection.
$thenFn = function ($value) use ($request, $hash) {
$this->finishResponse($request, $value, $hash);
if (!$request->getConfig()->get('_pool_retries')) {
$this->addNextRequests();
}
};
$promise->then($thenFn, $thenFn);
return true;
}
public function _trackRetries(BeforeEvent $e)
{
$e->getRequest()->getConfig()->set('_pool_retries', $e->getRetryCount());
}
private function finishResponse($request, $value, $hash)
{
unset($this->waitQueue[$hash]);
$result = $value instanceof ResponseInterface
? ['request' => $request, 'response' => $value, 'error' => null]
: ['request' => $request, 'response' => null, 'error' => $value];
$this->deferred->notify($result);
}
}