Symfony Profiler

<?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\EventListener;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestMatcherInterface;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpKernel\Event\ExceptionEvent;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\Event\TerminateEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\Profiler\Profile;
use Symfony\Component\HttpKernel\Profiler\Profiler;
/**
* ProfilerListener collects data for the current request by listening to the kernel events.
*
* @author Fabien Potencier <fabien@symfony.com>
*
* @final
*/
class ProfilerListener implements EventSubscriberInterface
{
private Profiler $profiler;
private ?RequestMatcherInterface $matcher;
private bool $onlyException;
private bool $onlyMainRequests;
private ?\Throwable $exception = null;
/** @var \SplObjectStorage<Request, Profile> */
private \SplObjectStorage $profiles;
private RequestStack $requestStack;
private ?string $collectParameter;
/** @var \SplObjectStorage<Request, Request|null> */
private \SplObjectStorage $parents;
/**
* @param bool $onlyException True if the profiler only collects data when an exception occurs, false otherwise
* @param bool $onlyMainRequests True if the profiler only collects data when the request is the main request, false otherwise
*/
public function __construct(Profiler $profiler, RequestStack $requestStack, RequestMatcherInterface $matcher = null, bool $onlyException = false, bool $onlyMainRequests = false, string $collectParameter = null)
{
$this->profiler = $profiler;
$this->matcher = $matcher;
$this->onlyException = $onlyException;
$this->onlyMainRequests = $onlyMainRequests;
$this->profiles = new \SplObjectStorage();
$this->parents = new \SplObjectStorage();
$this->requestStack = $requestStack;
$this->collectParameter = $collectParameter;
}
/**
* Handles the onKernelException event.
*/
public function onKernelException(ExceptionEvent $event)
{
if ($this->onlyMainRequests && !$event->isMainRequest()) {
return;
}
$this->exception = $event->getThrowable();
}
/**
* Handles the onKernelResponse event.
*/
public function onKernelResponse(ResponseEvent $event)
{
if ($this->onlyMainRequests && !$event->isMainRequest()) {
return;
}
if ($this->onlyException && null === $this->exception) {
return;
}
$request = $event->getRequest();
if (null !== $this->collectParameter && null !== $collectParameterValue = $request->get($this->collectParameter)) {
true === $collectParameterValue || filter_var($collectParameterValue, \FILTER_VALIDATE_BOOLEAN) ? $this->profiler->enable() : $this->profiler->disable();
}
$exception = $this->exception;
$this->exception = null;
if (null !== $this->matcher && !$this->matcher->matches($request)) {
return;
}
$session = $request->hasPreviousSession() && $request->hasSession() ? $request->getSession() : null;
if ($session instanceof Session) {
$usageIndexValue = $usageIndexReference = &$session->getUsageIndex();
$usageIndexReference = \PHP_INT_MIN;
}
try {
if (!$profile = $this->profiler->collect($request, $event->getResponse(), $exception)) {
return;
}
} finally {
if ($session instanceof Session) {
$usageIndexReference = $usageIndexValue;
}
}
$this->profiles[$request] = $profile;
$this->parents[$request] = $this->requestStack->getParentRequest();
}
public function onKernelTerminate(TerminateEvent $event)
{
// attach children to parents
foreach ($this->profiles as $request) {
if (null !== $parentRequest = $this->parents[$request]) {
if (isset($this->profiles[$parentRequest])) {
$this->profiles[$parentRequest]->addChild($this->profiles[$request]);
}
}
}
// save profiles
foreach ($this->profiles as $request) {
$this->profiler->saveProfile($this->profiles[$request]);
}
$this->profiles = new \SplObjectStorage();
$this->parents = new \SplObjectStorage();
}
public static function getSubscribedEvents(): array
{
return [
KernelEvents::RESPONSE => ['onKernelResponse', -100],
KernelEvents::EXCEPTION => ['onKernelException', 0],
KernelEvents::TERMINATE => ['onKernelTerminate', -1024],
];
}
}

vendor/symfony/http-kernel/EventListener/ProfilerListener.php line 122