Don't enable tracing unless the profiler is enabled

Author: nicolas-grekas

Debug/TraceableEventDispatcher.php

@@ -25,6 +25,9 @@ class TraceableEventDispatcher extends BaseTraceableEventDispatcher
 {
     protected function beforeDispatch(string $eventName, object $event): void
     {
+        if ($this->disabled?->__invoke()) {
+            return;
+        }
         switch ($eventName) {
             case KernelEvents::REQUEST:
                 $event->getRequest()->attributes->set('_stopwatch_token', bin2hex(random_bytes(3)));
@@ -57,6 +60,9 @@ protected function beforeDispatch(string $eventName, object $event): void
 
     protected function afterDispatch(string $eventName, object $event): void
     {
+        if ($this->disabled?->__invoke()) {
+            return;
+        }
         switch ($eventName) {
             case KernelEvents::CONTROLLER_ARGUMENTS:
                 $this->stopwatch->start('controller', 'section');

Profiler/ProfilerStateChecker.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Profiler;
+
+use Psr\Container\ContainerInterface;
+
+class ProfilerStateChecker
+{
+    public function __construct(
+        private ContainerInterface $container,
+        private bool $defaultEnabled,
+    ) {
+    }
+
+    public function isProfilerEnabled(): bool
+    {
+        return $this->container->get('profiler')?->isEnabled() ?? $this->defaultEnabled;
+    }
+
+    public function isProfilerDisabled(): bool
+    {
+        return !$this->isProfilerEnabled();
+    }
+}

composer.json

@@ -19,7 +19,7 @@
         "php": ">=8.2",
         "symfony/deprecation-contracts": "^2.5|^3",
         "symfony/error-handler": "^6.4|^7.0",
-        "symfony/event-dispatcher": "^6.4|^7.0",
+        "symfony/event-dispatcher": "^7.3",
         "symfony/http-foundation": "^7.3",
         "symfony/polyfill-ctype": "^1.8",
         "psr/log": "^1|^2|^3"