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<?php |
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namespace Guzzle\Http\Curl; |
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use Guzzle\Common\AbstractHasDispatcher; |
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use Guzzle\Common\Event; |
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use Guzzle\Http\Exception\MultiTransferException; |
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use Guzzle\Http\Exception\CurlException; |
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use Guzzle\Http\Message\RequestInterface; |
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use Guzzle\Http\Message\EntityEnclosingRequestInterface; |
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use Guzzle\Http\Exception\RequestException; |
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use Symfony\Component\EventDispatcher\EventDispatcherInterface; |
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/** |
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* Send {@see RequestInterface} objects in parallel using curl_multi |
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*/ |
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class CurlMulti extends AbstractHasDispatcher implements CurlMultiInterface |
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{ |
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/** @var resource cURL multi handle. */ |
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protected $multiHandle; |
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/** @var array Attached {@see RequestInterface} objects. */ |
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protected $requests; |
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/** @var \SplObjectStorage RequestInterface to CurlHandle hash */ |
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protected $handles; |
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/** @var array Hash mapping curl handle resource IDs to request objects */ |
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protected $resourceHash; |
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/** @var array Queued exceptions */ |
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protected $exceptions = array(); |
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/** @var array Requests that succeeded */ |
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protected $successful = array(); |
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/** @var array cURL multi error values and codes */ |
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protected $multiErrors = array( |
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CURLM_BAD_HANDLE => array('CURLM_BAD_HANDLE', 'The passed-in handle is not a valid CURLM handle.'), |
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CURLM_BAD_EASY_HANDLE => array('CURLM_BAD_EASY_HANDLE', "An easy handle was not good/valid. It could mean that it isn't an easy handle at all, or possibly that the handle already is in used by this or another multi handle."), |
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CURLM_OUT_OF_MEMORY => array('CURLM_OUT_OF_MEMORY', 'You are doomed.'), |
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CURLM_INTERNAL_ERROR => array('CURLM_INTERNAL_ERROR', 'This can only be returned if libcurl bugs. Please report it to us!') |
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); |
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/** @var float */ |
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protected $selectTimeout; |
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public function __construct($selectTimeout = 1.0) |
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{ |
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$this->selectTimeout = $selectTimeout; |
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$this->multiHandle = curl_multi_init(); |
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// @codeCoverageIgnoreStart |
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if ($this->multiHandle === false) { |
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throw new CurlException('Unable to create multi handle'); |
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} |
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// @codeCoverageIgnoreEnd |
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$this->reset(); |
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} |
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public function __destruct() |
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{ |
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if (is_resource($this->multiHandle)) { |
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curl_multi_close($this->multiHandle); |
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} |
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} |
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public function add(RequestInterface $request) |
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{ |
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$this->requests[] = $request; |
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// If requests are currently transferring and this is async, then the |
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// request must be prepared now as the send() method is not called. |
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$this->beforeSend($request); |
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$this->dispatch(self::ADD_REQUEST, array('request' => $request)); |
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return $this; |
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} |
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public function all() |
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{ |
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return $this->requests; |
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} |
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public function remove(RequestInterface $request) |
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{ |
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$this->removeHandle($request); |
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if (($index = array_search($request, $this->requests, true)) !== false) { |
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$request = $this->requests[$index]; |
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unset($this->requests[$index]); |
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$this->requests = array_values($this->requests); |
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$this->dispatch(self::REMOVE_REQUEST, array('request' => $request)); |
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return true; |
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} |
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return false; |
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} |
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public function reset($hard = false) |
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{ |
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// Remove each request |
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if ($this->requests) { |
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foreach ($this->requests as $request) { |
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$this->remove($request); |
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} |
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} |
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$this->handles = new \SplObjectStorage(); |
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$this->requests = $this->resourceHash = $this->exceptions = $this->successful = array(); |
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} |
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public function send() |
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{ |
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$this->perform(); |
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$exceptions = $this->exceptions; |
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$successful = $this->successful; |
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$this->reset(); |
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if ($exceptions) { |
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$this->throwMultiException($exceptions, $successful); |
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} |
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} |
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public function count() |
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{ |
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return count($this->requests); |
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} |
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/** |
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* Build and throw a MultiTransferException |
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* |
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* @param array $exceptions Exceptions encountered |
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* @param array $successful Successful requests |
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* @throws MultiTransferException |
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*/ |
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protected function throwMultiException(array $exceptions, array $successful) |
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{ |
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$multiException = new MultiTransferException('Errors during multi transfer'); |
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while ($e = array_shift($exceptions)) { |
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$multiException->addFailedRequestWithException($e['request'], $e['exception']); |
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} |
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// Add successful requests |
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foreach ($successful as $request) { |
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if (!$multiException->containsRequest($request)) { |
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$multiException->addSuccessfulRequest($request); |
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} |
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} |
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throw $multiException; |
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} |
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/** |
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* Prepare for sending |
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* |
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* @param RequestInterface $request Request to prepare |
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* @throws \Exception on error preparing the request |
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*/ |
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protected function beforeSend(RequestInterface $request) |
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{ |
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try { |
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$state = $request->setState(RequestInterface::STATE_TRANSFER); |
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if ($state == RequestInterface::STATE_TRANSFER) { |
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$this->addHandle($request); |
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} else { |
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// Requests might decide they don't need to be sent just before |
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// transfer (e.g. CachePlugin) |
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$this->remove($request); |
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if ($state == RequestInterface::STATE_COMPLETE) { |
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$this->successful[] = $request; |
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} |
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} |
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} catch (\Exception $e) { |
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// Queue the exception to be thrown when sent |
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$this->removeErroredRequest($request, $e); |
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} |
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} |
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private function addHandle(RequestInterface $request) |
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{ |
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$handle = $this->createCurlHandle($request)->getHandle(); |
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$this->checkCurlResult( |
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curl_multi_add_handle($this->multiHandle, $handle) |
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); |
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} |
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/** |
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* Create a curl handle for a request |
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* |
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* @param RequestInterface $request Request |
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* |
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* @return CurlHandle |
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*/ |
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protected function createCurlHandle(RequestInterface $request) |
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{ |
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$wrapper = CurlHandle::factory($request); |
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$this->handles[$request] = $wrapper; |
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$this->resourceHash[(int) $wrapper->getHandle()] = $request; |
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return $wrapper; |
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} |
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/** |
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* Get the data from the multi handle |
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*/ |
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protected function perform() |
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{ |
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$event = new Event(array('curl_multi' => $this)); |
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while ($this->requests) { |
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// Notify each request as polling |
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$blocking = $total = 0; |
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foreach ($this->requests as $request) { |
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++$total; |
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$event['request'] = $request; |
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/** @var EventDispatcherInterface $dispatcher */ |
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$dispatcher = $request->getEventDispatcher(); |
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$eventName = self::POLLING_REQUEST; |
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$event->setEventDispatcher($dispatcher); |
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$event->setName($eventName); |
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$dispatcher->dispatch($eventName, $event); |
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// The blocking variable just has to be non-falsey to block the loop |
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if ($request->getParams()->hasKey(self::BLOCKING)) { |
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++$blocking; |
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} |
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} |
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if ($blocking == $total) { |
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// Sleep to prevent eating CPU because no requests are actually pending a select call |
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usleep(500); |
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} else { |
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$this->executeHandles(); |
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} |
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} |
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} |
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/** |
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* Execute and select curl handles |
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*/ |
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private function executeHandles() |
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{ |
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// The first curl_multi_select often times out no matter what, but is usually required for fast transfers |
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$selectTimeout = 0.001; |
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$active = false; |
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do { |
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while (($mrc = curl_multi_exec($this->multiHandle, $active)) == CURLM_CALL_MULTI_PERFORM); |
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$this->checkCurlResult($mrc); |
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$this->processMessages(); |
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if ($active && curl_multi_select($this->multiHandle, $selectTimeout) === -1) { |
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// Perform a usleep if a select returns -1: https://bugs.php.net/bug.php?id=61141 |
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usleep(150); |
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} |
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$selectTimeout = $this->selectTimeout; |
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} while ($active); |
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} |
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/** |
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* Process any received curl multi messages |
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*/ |
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private function processMessages() |
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{ |
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while ($done = curl_multi_info_read($this->multiHandle)) { |
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$request = $this->resourceHash[(int) $done['handle']]; |
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try { |
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$this->processResponse($request, $this->handles[$request], $done); |
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$this->successful[] = $request; |
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} catch (\Exception $e) { |
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$this->removeErroredRequest($request, $e); |
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} |
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} |
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} |
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273
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274
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/** |
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275
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* Remove a request that encountered an exception |
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* |
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* @param RequestInterface $request Request to remove |
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* @param \Exception $e Exception encountered |
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*/ |
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protected function removeErroredRequest(RequestInterface $request, \Exception $e = null) |
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{ |
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282
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$this->exceptions[] = array('request' => $request, 'exception' => $e); |
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$this->remove($request); |
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284
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$this->dispatch(self::MULTI_EXCEPTION, array('exception' => $e, 'all_exceptions' => $this->exceptions)); |
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285
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} |
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286
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287
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/** |
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288
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* Check for errors and fix headers of a request based on a curl response |
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289
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* |
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290
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* @param RequestInterface $request Request to process |
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291
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* @param CurlHandle $handle Curl handle object |
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292
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* @param array $curl Array returned from curl_multi_info_read |
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293
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* |
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294
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* @throws CurlException on Curl error |
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295
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*/ |
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296
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protected function processResponse(RequestInterface $request, CurlHandle $handle, array $curl) |
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297
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{ |
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298
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// Set the transfer stats on the response |
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299
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$handle->updateRequestFromTransfer($request); |
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300
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// Check if a cURL exception occurred, and if so, notify things |
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$curlException = $this->isCurlException($request, $handle, $curl); |
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303
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// Always remove completed curl handles. They can be added back again |
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// via events if needed (e.g. ExponentialBackoffPlugin) |
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$this->removeHandle($request); |
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307
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if (!$curlException) { |
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if ($this->validateResponseWasSet($request)) { |
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309
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$state = $request->setState( |
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RequestInterface::STATE_COMPLETE, |
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array('handle' => $handle) |
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312
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); |
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313
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// Only remove the request if it wasn't resent as a result of |
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314
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// the state change |
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315
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if ($state != RequestInterface::STATE_TRANSFER) { |
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316
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$this->remove($request); |
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317
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} |
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318
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} |
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319
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return; |
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320
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} |
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321
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322
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// Set the state of the request to an error |
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323
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$state = $request->setState(RequestInterface::STATE_ERROR, array('exception' => $curlException)); |
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324
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// Allow things to ignore the error if possible |
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325
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if ($state != RequestInterface::STATE_TRANSFER) { |
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326
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|
$this->remove($request); |
|
327
|
|
|
} |
|
328
|
|
|
|
|
329
|
|
|
// The error was not handled, so fail |
|
330
|
|
|
if ($state == RequestInterface::STATE_ERROR) { |
|
331
|
|
|
/** @var CurlException $curlException */ |
|
332
|
|
|
throw $curlException; |
|
333
|
|
|
} |
|
334
|
|
|
} |
|
335
|
|
|
|
|
336
|
|
|
/** |
|
337
|
|
|
* Remove a curl handle from the curl multi object |
|
338
|
|
|
* |
|
339
|
|
|
* @param RequestInterface $request Request that owns the handle |
|
340
|
|
|
*/ |
|
341
|
|
|
protected function removeHandle(RequestInterface $request) |
|
342
|
|
|
{ |
|
343
|
|
|
if (isset($this->handles[$request])) { |
|
344
|
|
|
$handle = $this->handles[$request]; |
|
345
|
|
|
curl_multi_remove_handle($this->multiHandle, $handle->getHandle()); |
|
346
|
|
|
unset($this->handles[$request]); |
|
347
|
|
|
unset($this->resourceHash[(int) $handle->getHandle()]); |
|
348
|
|
|
$handle->close(); |
|
349
|
|
|
} |
|
350
|
|
|
} |
|
351
|
|
|
|
|
352
|
|
|
/** |
|
353
|
|
|
* Check if a cURL transfer resulted in what should be an exception |
|
354
|
|
|
* |
|
355
|
|
|
* @param RequestInterface $request Request to check |
|
356
|
|
|
* @param CurlHandle $handle Curl handle object |
|
357
|
|
|
* @param array $curl Array returned from curl_multi_info_read |
|
358
|
|
|
* |
|
359
|
|
|
* @return CurlException|bool |
|
360
|
|
|
*/ |
|
361
|
|
|
private function isCurlException(RequestInterface $request, CurlHandle $handle, array $curl) |
|
362
|
|
|
{ |
|
363
|
|
|
if (CURLM_OK == $curl['result'] || CURLM_CALL_MULTI_PERFORM == $curl['result']) { |
|
364
|
|
|
return false; |
|
365
|
|
|
} |
|
366
|
|
|
|
|
367
|
|
|
$handle->setErrorNo($curl['result']); |
|
368
|
|
|
$e = new CurlException(sprintf('[curl] %s: %s [url] %s', |
|
369
|
|
|
$handle->getErrorNo(), $handle->getError(), $handle->getUrl())); |
|
370
|
|
|
$e->setCurlHandle($handle) |
|
|
|
|
|
|
371
|
|
|
->setRequest($request) |
|
372
|
|
|
->setCurlInfo($handle->getInfo()) |
|
373
|
|
|
->setError($handle->getError(), $handle->getErrorNo()); |
|
374
|
|
|
|
|
375
|
|
|
return $e; |
|
376
|
|
|
} |
|
377
|
|
|
|
|
378
|
|
|
/** |
|
379
|
|
|
* Throw an exception for a cURL multi response if needed |
|
380
|
|
|
* |
|
381
|
|
|
* @param int $code Curl response code |
|
382
|
|
|
* @throws CurlException |
|
383
|
|
|
*/ |
|
384
|
|
|
private function checkCurlResult($code) |
|
385
|
|
|
{ |
|
386
|
|
|
if ($code != CURLM_OK && $code != CURLM_CALL_MULTI_PERFORM) { |
|
387
|
|
|
throw new CurlException(isset($this->multiErrors[$code]) |
|
388
|
|
|
? "cURL error: {$code} ({$this->multiErrors[$code][0]}): cURL message: {$this->multiErrors[$code][1]}" |
|
389
|
|
|
: 'Unexpected cURL error: ' . $code |
|
390
|
|
|
); |
|
391
|
|
|
} |
|
392
|
|
|
} |
|
393
|
|
|
|
|
394
|
|
|
/** |
|
395
|
|
|
* @link https://github.com/guzzle/guzzle/issues/710 |
|
396
|
|
|
*/ |
|
397
|
|
|
private function validateResponseWasSet(RequestInterface $request) |
|
398
|
|
|
{ |
|
399
|
|
|
if ($request->getResponse()) { |
|
400
|
|
|
return true; |
|
401
|
|
|
} |
|
402
|
|
|
|
|
403
|
|
|
$body = $request instanceof EntityEnclosingRequestInterface |
|
404
|
|
|
? $request->getBody() |
|
405
|
|
|
: null; |
|
406
|
|
|
|
|
407
|
|
|
if (!$body) { |
|
408
|
|
|
$rex = new RequestException( |
|
409
|
|
|
'No response was received for a request with no body. This' |
|
410
|
|
|
. ' could mean that you are saturating your network.' |
|
411
|
|
|
); |
|
412
|
|
|
$rex->setRequest($request); |
|
413
|
|
|
$this->removeErroredRequest($request, $rex); |
|
414
|
|
|
} elseif (!$body->isSeekable() || !$body->seek(0)) { |
|
415
|
|
|
// Nothing we can do with this. Sorry! |
|
416
|
|
|
$rex = new RequestException( |
|
417
|
|
|
'The connection was unexpectedly closed. The request would' |
|
418
|
|
|
. ' have been retried, but attempting to rewind the' |
|
419
|
|
|
. ' request body failed.' |
|
420
|
|
|
); |
|
421
|
|
|
$rex->setRequest($request); |
|
422
|
|
|
$this->removeErroredRequest($request, $rex); |
|
423
|
|
|
} else { |
|
424
|
|
|
$this->remove($request); |
|
425
|
|
|
// Add the request back to the batch to retry automatically. |
|
426
|
|
|
$this->requests[] = $request; |
|
427
|
|
|
$this->addHandle($request); |
|
428
|
|
|
} |
|
429
|
|
|
|
|
430
|
|
|
return false; |
|
431
|
|
|
} |
|
432
|
|
|
} |
|
433
|
|
|
|
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.