[Mailer] Add a way to change the Bus transport dynamically

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -102,6 +102,7 @@
 use Symfony\Component\Mailer\Bridge\Sendgrid\Transport\SendgridTransportFactory;
 use Symfony\Component\Mailer\Bridge\Sendinblue\Transport\SendinblueTransportFactory;
 use Symfony\Component\Mailer\Command\MailerTestCommand;
+use Symfony\Component\Mailer\EventListener\MessengerTransportListener;
 use Symfony\Component\Mailer\Mailer;
 use Symfony\Component\Mercure\HubRegistry;
 use Symfony\Component\Messenger\Attribute\AsMessageHandler;
@@ -2486,6 +2487,10 @@ private function registerMailerConfiguration(array $config, ContainerBuilder $co
         } else {
             $container->removeDefinition('mailer.message_listener');
         }
+
+        if (!class_exists(MessengerTransportListener::class)) {
+            $container->removeDefinition('mailer.messenger_transport_listener');
+        }
     }
 
     private function registerNotifierConfiguration(array $config, ContainerBuilder $container, PhpFileLoader $loader)

Resources/config/mailer.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Mailer\EventListener\EnvelopeListener;
 use Symfony\Component\Mailer\EventListener\MessageListener;
 use Symfony\Component\Mailer\EventListener\MessageLoggerListener;
+use Symfony\Component\Mailer\EventListener\MessengerTransportListener;
 use Symfony\Component\Mailer\Mailer;
 use Symfony\Component\Mailer\MailerInterface;
 use Symfony\Component\Mailer\Messenger\MessageHandler;
@@ -74,6 +75,9 @@
             ->tag('kernel.event_subscriber')
             ->tag('kernel.reset', ['method' => 'reset'])
 
+        ->set('mailer.messenger_transport_listener', MessengerTransportListener::class)
+            ->tag('kernel.event_subscriber')
+
         ->set('console.command.mailer_test', MailerTestCommand::class)
             ->args([
                 service('mailer.transports'),

composer.json

@@ -47,7 +47,7 @@
         "symfony/html-sanitizer": "^6.1",
         "symfony/http-client": "^5.4|^6.0",
         "symfony/lock": "^5.4|^6.0",
-        "symfony/mailer": "^5.4|^6.0",
+        "symfony/mailer": "^6.2",
         "symfony/messenger": "^6.1",
         "symfony/mime": "^5.4|^6.0",
         "symfony/notifier": "^5.4|^6.0",