352 lines
12 KiB
PHP
352 lines
12 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\EventDispatcher\Debug;
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use Psr\EventDispatcher\StoppableEventInterface;
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use Psr\Log\LoggerInterface;
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use Symfony\Component\EventDispatcher\EventDispatcher;
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use Symfony\Component\EventDispatcher\EventDispatcherInterface;
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use Symfony\Component\EventDispatcher\EventSubscriberInterface;
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\RequestStack;
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use Symfony\Component\Stopwatch\Stopwatch;
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use Symfony\Contracts\Service\ResetInterface;
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/**
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* Collects some data about event listeners.
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*
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* This event dispatcher delegates the dispatching to another one.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class TraceableEventDispatcher implements EventDispatcherInterface, ResetInterface
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{
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/**
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* @var \SplObjectStorage<WrappedListener, array{string, string}>|null
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*/
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private ?\SplObjectStorage $callStack = null;
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private array $wrappedListeners = [];
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private array $orphanedEvents = [];
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private string $currentRequestHash = '';
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public function __construct(
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private EventDispatcherInterface $dispatcher,
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protected Stopwatch $stopwatch,
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protected ?LoggerInterface $logger = null,
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private ?RequestStack $requestStack = null,
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) {
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}
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public function addListener(string $eventName, callable|array $listener, int $priority = 0): void
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{
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$this->dispatcher->addListener($eventName, $listener, $priority);
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}
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public function addSubscriber(EventSubscriberInterface $subscriber): void
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{
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$this->dispatcher->addSubscriber($subscriber);
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}
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public function removeListener(string $eventName, callable|array $listener): void
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{
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if (isset($this->wrappedListeners[$eventName])) {
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foreach ($this->wrappedListeners[$eventName] as $index => $wrappedListener) {
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if ($wrappedListener->getWrappedListener() === $listener || ($listener instanceof \Closure && $wrappedListener->getWrappedListener() == $listener)) {
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$listener = $wrappedListener;
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unset($this->wrappedListeners[$eventName][$index]);
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break;
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}
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}
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}
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$this->dispatcher->removeListener($eventName, $listener);
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}
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public function removeSubscriber(EventSubscriberInterface $subscriber): void
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{
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$this->dispatcher->removeSubscriber($subscriber);
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}
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public function getListeners(?string $eventName = null): array
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{
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return $this->dispatcher->getListeners($eventName);
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}
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public function getListenerPriority(string $eventName, callable|array $listener): ?int
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{
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// we might have wrapped listeners for the event (if called while dispatching)
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// in that case get the priority by wrapper
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if (isset($this->wrappedListeners[$eventName])) {
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foreach ($this->wrappedListeners[$eventName] as $wrappedListener) {
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if ($wrappedListener->getWrappedListener() === $listener || ($listener instanceof \Closure && $wrappedListener->getWrappedListener() == $listener)) {
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return $this->dispatcher->getListenerPriority($eventName, $wrappedListener);
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}
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}
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}
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return $this->dispatcher->getListenerPriority($eventName, $listener);
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}
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public function hasListeners(?string $eventName = null): bool
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{
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return $this->dispatcher->hasListeners($eventName);
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}
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public function dispatch(object $event, ?string $eventName = null): object
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{
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$eventName ??= $event::class;
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$this->callStack ??= new \SplObjectStorage();
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$currentRequestHash = $this->currentRequestHash = $this->requestStack && ($request = $this->requestStack->getCurrentRequest()) ? spl_object_hash($request) : '';
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if (null !== $this->logger && $event instanceof StoppableEventInterface && $event->isPropagationStopped()) {
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$this->logger->debug(\sprintf('The "%s" event is already stopped. No listeners have been called.', $eventName));
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}
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$this->preProcess($eventName);
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try {
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$this->beforeDispatch($eventName, $event);
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try {
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$e = $this->stopwatch->start($eventName, 'section');
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try {
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$this->dispatcher->dispatch($event, $eventName);
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} finally {
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if ($e->isStarted()) {
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$e->stop();
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}
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}
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} finally {
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$this->afterDispatch($eventName, $event);
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}
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} finally {
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$this->currentRequestHash = $currentRequestHash;
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$this->postProcess($eventName);
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}
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return $event;
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}
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public function getCalledListeners(?Request $request = null): array
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{
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if (null === $this->callStack) {
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return [];
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}
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$hash = $request ? spl_object_hash($request) : null;
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$called = [];
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foreach ($this->callStack as $listener) {
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[$eventName, $requestHash] = $this->callStack->getInfo();
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if (null === $hash || $hash === $requestHash) {
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$called[] = $listener->getInfo($eventName);
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}
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}
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return $called;
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}
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public function getNotCalledListeners(?Request $request = null): array
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{
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try {
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$allListeners = $this->dispatcher instanceof EventDispatcher ? $this->getListenersWithPriority() : $this->getListenersWithoutPriority();
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} catch (\Exception $e) {
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$this->logger?->info('An exception was thrown while getting the uncalled listeners.', ['exception' => $e]);
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// unable to retrieve the uncalled listeners
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return [];
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}
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$hash = $request ? spl_object_hash($request) : null;
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$calledListeners = [];
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if (null !== $this->callStack) {
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foreach ($this->callStack as $calledListener) {
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[, $requestHash] = $this->callStack->getInfo();
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if (null === $hash || $hash === $requestHash) {
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$calledListeners[] = $calledListener->getWrappedListener();
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}
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}
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}
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$notCalled = [];
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foreach ($allListeners as $eventName => $listeners) {
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foreach ($listeners as [$listener, $priority]) {
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if (!\in_array($listener, $calledListeners, true)) {
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if (!$listener instanceof WrappedListener) {
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$listener = new WrappedListener($listener, null, $this->stopwatch, $this, $priority);
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}
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$notCalled[] = $listener->getInfo($eventName);
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}
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}
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}
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uasort($notCalled, $this->sortNotCalledListeners(...));
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return $notCalled;
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}
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public function getOrphanedEvents(?Request $request = null): array
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{
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if ($request) {
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return $this->orphanedEvents[spl_object_hash($request)] ?? [];
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}
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if (!$this->orphanedEvents) {
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return [];
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}
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return array_merge(...array_values($this->orphanedEvents));
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}
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public function reset(): void
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{
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$this->callStack = null;
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$this->orphanedEvents = [];
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$this->currentRequestHash = '';
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}
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/**
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* Proxies all method calls to the original event dispatcher.
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*
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* @param string $method The method name
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* @param array $arguments The method arguments
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*/
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public function __call(string $method, array $arguments): mixed
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{
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return $this->dispatcher->{$method}(...$arguments);
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}
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/**
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* Called before dispatching the event.
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*/
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protected function beforeDispatch(string $eventName, object $event): void
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{
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}
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/**
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* Called after dispatching the event.
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*/
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protected function afterDispatch(string $eventName, object $event): void
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{
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}
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private function preProcess(string $eventName): void
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{
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if (!$this->dispatcher->hasListeners($eventName)) {
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$this->orphanedEvents[$this->currentRequestHash][] = $eventName;
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return;
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}
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foreach ($this->dispatcher->getListeners($eventName) as $listener) {
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$priority = $this->getListenerPriority($eventName, $listener);
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$wrappedListener = new WrappedListener($listener instanceof WrappedListener ? $listener->getWrappedListener() : $listener, null, $this->stopwatch, $this);
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$this->wrappedListeners[$eventName][] = $wrappedListener;
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$this->dispatcher->removeListener($eventName, $listener);
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$this->dispatcher->addListener($eventName, $wrappedListener, $priority);
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$this->callStack->attach($wrappedListener, [$eventName, $this->currentRequestHash]);
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}
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}
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private function postProcess(string $eventName): void
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{
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unset($this->wrappedListeners[$eventName]);
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$skipped = false;
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foreach ($this->dispatcher->getListeners($eventName) as $listener) {
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if (!$listener instanceof WrappedListener) { // #12845: a new listener was added during dispatch.
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continue;
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}
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// Unwrap listener
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$priority = $this->getListenerPriority($eventName, $listener);
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$this->dispatcher->removeListener($eventName, $listener);
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$this->dispatcher->addListener($eventName, $listener->getWrappedListener(), $priority);
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if (null !== $this->logger) {
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$context = ['event' => $eventName, 'listener' => $listener->getPretty()];
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}
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if ($listener->wasCalled()) {
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$this->logger?->debug('Notified event "{event}" to listener "{listener}".', $context);
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} else {
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$this->callStack->detach($listener);
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}
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if (null !== $this->logger && $skipped) {
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$this->logger->debug('Listener "{listener}" was not called for event "{event}".', $context);
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}
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if ($listener->stoppedPropagation()) {
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$this->logger?->debug('Listener "{listener}" stopped propagation of the event "{event}".', $context);
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$skipped = true;
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}
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}
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}
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private function sortNotCalledListeners(array $a, array $b): int
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{
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if (0 !== $cmp = strcmp($a['event'], $b['event'])) {
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return $cmp;
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}
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if (\is_int($a['priority']) && !\is_int($b['priority'])) {
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return 1;
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}
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if (!\is_int($a['priority']) && \is_int($b['priority'])) {
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return -1;
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}
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if ($a['priority'] === $b['priority']) {
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return 0;
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}
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if ($a['priority'] > $b['priority']) {
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return -1;
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}
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return 1;
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}
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private function getListenersWithPriority(): array
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{
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$result = [];
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$allListeners = new \ReflectionProperty(EventDispatcher::class, 'listeners');
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foreach ($allListeners->getValue($this->dispatcher) as $eventName => $listenersByPriority) {
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foreach ($listenersByPriority as $priority => $listeners) {
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foreach ($listeners as $listener) {
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$result[$eventName][] = [$listener, $priority];
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}
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}
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}
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return $result;
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}
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private function getListenersWithoutPriority(): array
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{
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$result = [];
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foreach ($this->getListeners() as $eventName => $listeners) {
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foreach ($listeners as $listener) {
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$result[$eventName][] = [$listener, null];
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}
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}
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return $result;
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}
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}
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