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ProfilerListener.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpKernel\EventListener;
013
014 use Symfony\Component\HttpKernel\HttpKernelInterface;
015 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
016 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
017 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
018 use Symfony\Component\HttpKernel\KernelEvents;
019 use Symfony\Component\HttpKernel\Profiler\Profile;
020 use Symfony\Component\HttpKernel\Profiler\Profiler;
021 use Symfony\Component\HttpFoundation\RequestMatcherInterface;
022 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
023
024 /**
025 * ProfilerListener collects data for the current request by listening to the onKernelResponse event.
026 *
027 * @author Fabien Potencier <fabien@symfony.com>
028 */
029 class ProfilerListener implements EventSubscriberInterface
030 {
031 protected $profiler;
032 protected $matcher;
033 protected $onlyException;
034 protected $onlyMasterRequests;
035 protected $exception;
036 protected $children;
037 protected $requests;
038 protected $profiles;
039
040 /**
041 * Constructor.
042 *
043 * @param Profiler $profiler A Profiler instance
044 * @param RequestMatcherInterface $matcher A RequestMatcher instance
045 * @param bool $onlyException true if the profiler only collects data when an exception occurs, false otherwise
046 * @param bool $onlyMasterRequests true if the profiler only collects data when the request is a master request, false otherwise
047 */
048 public function __construct(Profiler $profiler, RequestMatcherInterface $matcher = null, $onlyException = false, $onlyMasterRequests = false)
049 {
050 $this->profiler = $profiler;
051 $this->matcher = $matcher;
052 $this->onlyException = (bool) $onlyException;
053 $this->onlyMasterRequests = (bool) $onlyMasterRequests;
054 $this->children = new \SplObjectStorage();
055 $this->profiles = array();
056 }
057
058 /**
059 * Handles the onKernelException event.
060 *
061 * @param GetResponseForExceptionEvent $event A GetResponseForExceptionEvent instance
062 */
063 public function onKernelException(GetResponseForExceptionEvent $event)
064 {
065 if ($this->onlyMasterRequests && HttpKernelInterface::MASTER_REQUEST !== $event->getRequestType()) {
066 return;
067 }
068
069 $this->exception = $event->getException();
070 }
071
072 public function onKernelRequest(GetResponseEvent $event)
073 {
074 $this->requests[] = $event->getRequest();
075 }
076
077 /**
078 * Handles the onKernelResponse event.
079 *
080 * @param FilterResponseEvent $event A FilterResponseEvent instance
081 */
082 public function onKernelResponse(FilterResponseEvent $event)
083 {
084 $master = HttpKernelInterface::MASTER_REQUEST === $event->getRequestType();
085 if ($this->onlyMasterRequests && !$master) {
086 return;
087 }
088
089 if ($this->onlyException && null === $this->exception) {
090 return;
091 }
092
093 $request = $event->getRequest();
094 $exception = $this->exception;
095 $this->exception = null;
096
097 if (null !== $this->matcher && !$this->matcher->matches($request)) {
098 return;
099 }
100
101 if (!$profile = $this->profiler->collect($request, $event->getResponse(), $exception)) {
102 return;
103 }
104
105 $this->profiles[] = $profile;
106
107 if (null !== $exception) {
108 foreach ($this->profiles as $profile) {
109 $this->profiler->saveProfile($profile);
110 }
111
112 return;
113 }
114
115 // keep the profile as the child of its parent
116 if (!$master) {
117 array_pop($this->requests);
118
119 $parent = end($this->requests);
120
121 // when simulating requests, we might not have the parent
122 if ($parent) {
123 $profiles = isset($this->children[$parent]) ? $this->children[$parent] : array();
124 $profiles[] = $profile;
125 $this->children[$parent] = $profiles;
126 }
127 }
128
129 if (isset($this->children[$request])) {
130 foreach ($this->children[$request] as $child) {
131 $profile->addChild($child);
132 }
133 $this->children[$request] = array();
134 }
135
136 if ($master) {
137 $this->saveProfiles($profile);
138
139 $this->children = new \SplObjectStorage();
140 }
141 }
142
143 public static function getSubscribedEvents()
144 {
145 return array(
146 // kernel.request must be registered as early as possible to not break
147 // when an exception is thrown in any other kernel.request listener
148 KernelEvents::REQUEST => array('onKernelRequest', 1024),
149 KernelEvents::RESPONSE => array('onKernelResponse', -100),
150 KernelEvents::EXCEPTION => 'onKernelException',
151 );
152 }
153
154 /**
155 * Saves the profile hierarchy.
156 *
157 * @param Profile $profile The root profile
158 */
159 private function saveProfiles(Profile $profile)
160 {
161 $this->profiler->saveProfile($profile);
162 foreach ($profile->getChildren() as $profile) {
163 $this->saveProfiles($profile);
164 }
165 }
166 }
167