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File: CurlMultiHandler.php
<?php namespace GuzzleHttp\Handler; use GuzzleHttp\Promise as P; use GuzzleHttp\Promise\Promise; use GuzzleHttp\Utils; use Psr\Http\Message\RequestInterface; /** * Returns an asynchronous response using curl_multi_* functions. * * When using the CurlMultiHandler, custom curl options can be specified as an * associative array of curl option constants mapping to values in the * **curl** key of the provided request options. * * @property resource $_mh Internal use only. Lazy loaded multi-handle. */ class CurlMultiHandler { /** @var CurlFactoryInterface */ private $factory; private $selectTimeout; private $active; private $handles = []; private $delays = []; private $options = []; /** * This handler accepts the following options: * * - handle_factory: An optional factory used to create curl handles * - select_timeout: Optional timeout (in seconds) to block before timing * out while selecting curl handles. Defaults to 1 second. * - options: An associative array of CURLMOPT_* options and * corresponding values for curl_multi_setopt() * * @param array $options */ public function __construct(array $options = []) { $this->factory = isset($options['handle_factory']) ? $options['handle_factory'] : new CurlFactory(50); if (isset($options['select_timeout'])) { $this->selectTimeout = $options['select_timeout']; } elseif ($selectTimeout = getenv('GUZZLE_CURL_SELECT_TIMEOUT')) { $this->selectTimeout = $selectTimeout; } else { $this->selectTimeout = 1; } $this->options = isset($options['options']) ? $options['options'] : []; } public function __get($name) { if ($name === '_mh') { $this->_mh = curl_multi_init(); foreach ($this->options as $option => $value) { // A warning is raised in case of a wrong option. curl_multi_setopt($this->_mh, $option, $value); } // Further calls to _mh will return the value directly, without entering the // __get() method at all. return $this->_mh; } throw new \BadMethodCallException(); } public function __destruct() { if (isset($this->_mh)) { curl_multi_close($this->_mh); unset($this->_mh); } } public function __invoke(RequestInterface $request, array $options) { $easy = $this->factory->create($request, $options); $id = (int) $easy->handle; $promise = new Promise( [$this, 'execute'], function () use ($id) { return $this->cancel($id); } ); $this->addRequest(['easy' => $easy, 'deferred' => $promise]); return $promise; } /** * Ticks the curl event loop. */ public function tick() { // Add any delayed handles if needed. if ($this->delays) { $currentTime = Utils::currentTime(); foreach ($this->delays as $id => $delay) { if ($currentTime >= $delay) { unset($this->delays[$id]); curl_multi_add_handle( $this->_mh, $this->handles[$id]['easy']->handle ); } } } // Step through the task queue which may add additional requests. P\queue()->run(); if ($this->active && curl_multi_select($this->_mh, $this->selectTimeout) === -1 ) { // Perform a usleep if a select returns -1. // See: https://bugs.php.net/bug.php?id=61141 usleep(250); } while (curl_multi_exec($this->_mh, $this->active) === CURLM_CALL_MULTI_PERFORM); $this->processMessages(); } /** * Runs until all outstanding connections have completed. */ public function execute() { $queue = P\queue(); while ($this->handles || !$queue->isEmpty()) { // If there are no transfers, then sleep for the next delay if (!$this->active && $this->delays) { usleep($this->timeToNext()); } $this->tick(); } } private function addRequest(array $entry) { $easy = $entry['easy']; $id = (int) $easy->handle; $this->handles[$id] = $entry; if (empty($easy->options['delay'])) { curl_multi_add_handle($this->_mh, $easy->handle); } else { $this->delays[$id] = Utils::currentTime() + ($easy->options['delay'] / 1000); } } /** * Cancels a handle from sending and removes references to it. * * @param int $id Handle ID to cancel and remove. * * @return bool True on success, false on failure. */ private function cancel($id) { // Cannot cancel if it has been processed. if (!isset($this->handles[$id])) { return false; } $handle = $this->handles[$id]['easy']->handle; unset($this->delays[$id], $this->handles[$id]); curl_multi_remove_handle($this->_mh, $handle); curl_close($handle); return true; } private function processMessages() { while ($done = curl_multi_info_read($this->_mh)) { $id = (int) $done['handle']; curl_multi_remove_handle($this->_mh, $done['handle']); if (!isset($this->handles[$id])) { // Probably was cancelled. continue; } $entry = $this->handles[$id]; unset($this->handles[$id], $this->delays[$id]); $entry['easy']->errno = $done['result']; $entry['deferred']->resolve( CurlFactory::finish( $this, $entry['easy'], $this->factory ) ); } } private function timeToNext() { $currentTime = Utils::currentTime(); $nextTime = PHP_INT_MAX; foreach ($this->delays as $time) { if ($time < $nextTime) { $nextTime = $time; } } return max(0, $nextTime - $currentTime) * 1000000; } }