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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpKernel\Debug;
use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher as BaseTraceableEventDispatcher;
use Symfony\Component\HttpKernel\KernelEvents;
/**
* Collects some data about event listeners.
*
* This event dispatcher delegates the dispatching to another one.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class TraceableEventDispatcher extends BaseTraceableEventDispatcher
{
/**
* {@inheritdoc}
*/
protected function beforeDispatch(string $eventName, object $event)
{
switch ($eventName) {
case KernelEvents::REQUEST:
$this->stopwatch->openSection();
break;
case KernelEvents::VIEW:
case KernelEvents::RESPONSE:
// stop only if a controller has been executed
if ($this->stopwatch->isStarted('controller')) {
$this->stopwatch->stop('controller');
}
break;
case KernelEvents::TERMINATE:
$token = $event->getResponse()->headers->get('X-Debug-Token');
if (null === $token) {
break;
}
// There is a very special case when using built-in AppCache class as kernel wrapper, in the case
// of an ESI request leading to a `stale` response [B] inside a `fresh` cached response [A].
// In this case, `$token` contains the [B] debug token, but the open `stopwatch` section ID
// is equal to the [A] debug token. Trying to reopen section with the [B] token throws an exception
// which must be caught.
try {
$this->stopwatch->openSection($token);
} catch (\LogicException $e) {
}
break;
}
}
/**
* {@inheritdoc}
*/
protected function afterDispatch(string $eventName, object $event)
{
switch ($eventName) {
case KernelEvents::CONTROLLER_ARGUMENTS:
$this->stopwatch->start('controller', 'section');
break;
case KernelEvents::RESPONSE:
$token = $event->getResponse()->headers->get('X-Debug-Token');
if (null === $token) {
break;
}
$this->stopwatch->stopSection($token);
break;
case KernelEvents::TERMINATE:
// In the special case described in the `preDispatch` method above, the `$token` section
// does not exist, then closing it throws an exception which must be caught.
$token = $event->getResponse()->headers->get('X-Debug-Token');
if (null === $token) {
break;
}
try {
$this->stopwatch->stopSection($token);
} catch (\LogicException $e) {
}
break;
}
}
}