drupal-events

Drupal Event Subscribers

Example (Best Practice)

// src/EventSubscriber/MyEventSubscriber.php
namespace Drupal\my_module\EventSubscriber;

use Drupal\Core\Session\AccountProxyInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;

final class MyEventSubscriber implements EventSubscriberInterface {

  public function __construct(
    private readonly AccountProxyInterface $currentUser,
  ) {}

public static function getSubscribedEvents(): array { return [ // Note: Higher priority runs earlier. Default is 0. KernelEvents::REQUEST => ['onRequest', 100], ]; }

public function onRequest(RequestEvent $event): void { if (!$event->isMainRequest()) { return; }

if (!$this->currentUser->isAuthenticated()) {
  return;
}

// Example: log or modify behavior for authenticated users.

}

}

## Register in services.yml

```yaml
services:
  my_module.my_event_subscriber:
    class: Drupal\my_module\EventSubscriber\MyEventSubscriber
    arguments: ['@current_user']
    tags:
      - { name: event_subscriber }

Common Events

Event	Constant	When
Request	KernelEvents::REQUEST	Every request
Response	KernelEvents::RESPONSE	Before response sent
Terminate	KernelEvents::TERMINATE	After response sent
Exception	KernelEvents::EXCEPTION	On uncaught exception

Generate with Drush

drush generate event-subscriber --answers='{
  "module": "my_module",
  "class": "MyEventSubscriber",
  "event": "kernel.request"
}'