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<?php
namespace Guzzle\Plugin\Async;
use Guzzle\Common\Event;
use Guzzle\Http\Message\Response;
use Guzzle\Http\Exception\CurlException;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
/**
* Sends requests but does not wait for the response
*/
class AsyncPlugin implements EventSubscriberInterface
{
public static function getSubscribedEvents()
{
return array(
'request.before_send' => 'onBeforeSend',
'request.exception' => 'onRequestTimeout',
'request.sent' => 'onRequestSent',
'curl.callback.progress' => 'onCurlProgress'
);
}
/**
* Event used to ensure that progress callback are emitted from the curl handle's request mediator.
*
* @param Event $event
*/
public function onBeforeSend(Event $event)
{
// Ensure that progress callbacks are dispatched
$event['request']->getCurlOptions()->set('progress', true);
}
/**
* Event emitted when a curl progress function is called. When the amount of data uploaded == the amount of data to
* upload OR any bytes have been downloaded, then time the request out after 1ms because we're done with
* transmitting the request, and tell curl not download a body.
*
* @param Event $event
*/
public function onCurlProgress(Event $event)
{
if ($event['handle'] &&
($event['downloaded'] || (isset($event['uploaded']) && $event['upload_size'] === $event['uploaded']))
) {
// Timeout after 1ms
curl_setopt($event['handle'], CURLOPT_TIMEOUT_MS, 1);
// Even if the response is quick, tell curl not to download the body.
// - Note that we can only perform this shortcut if the request transmitted a body so as to ensure that the
// request method is not converted to a HEAD request before the request was sent via curl.
if ($event['uploaded']) {
curl_setopt($event['handle'], CURLOPT_NOBODY, true);
}
}
}
/**
* Event emitted when a curl exception occurs. Ignore the exception and set a mock response.
*
* @param Event $event
*/
public function onRequestTimeout(Event $event)
{
if ($event['exception'] instanceof CurlException) {
$event['request']->setResponse(new Response(200, array(
'X-Guzzle-Async' => 'Did not wait for the response'
)));
}
}
/**
* Event emitted when a request completes because it took less than 1ms. Add an X-Guzzle-Async header to notify the
* caller that there is no body in the message.
*
* @param Event $event
*/
public function onRequestSent(Event $event)
{
// Let the caller know this was meant to be async
$event['request']->getResponse()->setHeader('X-Guzzle-Async', 'Did not wait for the response');
}
}