GuzzleExceptionListener.php

<?php

namespace Tristanbes\ElophantBundle\EventListener;

use Guzzle\Http\Exception\BadResponseException;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;

use Tristanbes\ElophantBundle\Manager\StatsManager;

/**
 * Class GuzzleExceptionListener
 */
class GuzzleExceptionListener
{
    private $statsManager;
    private $fail = false;

    /**
     * Constructor
     *
     * @param StatsManager $manager The stats Manager
     */
    public function __construct(StatsManager $manager)
    {
        $this->statsManager = $manager;
    }

    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        $exception = $event->getException();

        if ($exception instanceof BadResponseException) {
            $this->fail = true;
            $response   = new JsonResponse(array('success' => false));
            $event->setResponse($response);
        }
    }

    public function onKernelTerminate()
    {
        if (false === $this->fail) {
            return;
        }

        $this->statsManager->addFail();
    }
}

services.xml

<service id="tristanbes_elophant.guzzle_exception_eventlistener" class="%tristanbes_elophant.guzzle.exception.class%">
    <tag name="kernel.event_listener" event="kernel.exception" method="onKernelException" />
    <tag name="kernel.event_listener" event="kernel.terminate" method="onKernelTerminate" />
    <argument type="service" id="tristanbes_elophant.stats.manager" />
</service>