Add the WithLoggerChannel attribute to autoconfigure the channel

Attribute/WithLoggerChannel.php

@@ -0,0 +1,31 @@
+<?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\Bundle\MonologBundle\Attribute;
+
+/**
+ * Autoconfigures the logger channel used when inject a logger in the service.
+ *
+ * This adds the `monolog.logger` tag on the service definition.
+ */
+#[\Attribute(\Attribute::TARGET_CLASS)]
+final class WithLoggerChannel
+{
+    /**
+     * @readonly
+     */
+    public string $channel;
+
+    public function __construct(string $channel)
+    {
+        $this->channel = $channel;
+    }
+}

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## Unreleased
 
+* Add a `WithLoggerChannel` attribute to autoconfigure the `monolog.logger` tag
 * Add support for Symfony 7
 * Remove support for Symfony 4
 * Add support for env placeholders in the `level` option of handlers

DependencyInjection/MonologExtension.php

@@ -24,6 +24,7 @@
 use Symfony\Bridge\Monolog\Processor\WebProcessor;
 use Symfony\Bridge\Monolog\Logger as LegacyLogger;
 use Symfony\Bundle\FullStack;
+use Symfony\Bundle\MonologBundle\Attribute\WithLoggerChannel;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Argument\BoundArgument;
 use Symfony\Component\DependencyInjection\ChildDefinition;
@@ -135,6 +136,9 @@ public function load(array $configs, ContainerBuilder $container)
 
                 $definition->addTag('monolog.processor', $tagAttributes);
             });
+            $container->registerAttributeForAutoconfiguration(WithLoggerChannel::class, static function (ChildDefinition $definition, WithLoggerChannel $attribute): void {
+                $definition->addTag('monolog.logger', ['channel' => $attribute->channel]);
+            });
         }
     }
 

Tests/DependencyInjection/Fixtures/ServiceWithChannel.php

@@ -0,0 +1,19 @@
+<?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\Bundle\MonologBundle\Tests\DependencyInjection\Fixtures;
+
+use Symfony\Bundle\MonologBundle\Attribute\WithLoggerChannel;
+
+#[WithLoggerChannel('fixture')]
+class ServiceWithChannel
+{
+}

Tests/DependencyInjection/MonologExtensionTest.php

@@ -17,12 +17,12 @@
 use Monolog\Handler\RollbarHandler;
 use Monolog\Logger;
 use Monolog\Processor\UidProcessor;
-use Symfony\Bridge\Monolog\Processor\SwitchUserTokenProcessor;
 use Symfony\Bundle\MonologBundle\DependencyInjection\MonologExtension;
 use Symfony\Bundle\MonologBundle\DependencyInjection\Compiler\LoggerChannelPass;
 use Symfony\Bundle\MonologBundle\Tests\DependencyInjection\Fixtures\AsMonologProcessor\FooProcessor;
 use Symfony\Bundle\MonologBundle\Tests\DependencyInjection\Fixtures\AsMonologProcessor\FooProcessorWithPriority;
 use Symfony\Bundle\MonologBundle\Tests\DependencyInjection\Fixtures\AsMonologProcessor\RedeclareMethodProcessor;
+use Symfony\Bundle\MonologBundle\Tests\DependencyInjection\Fixtures\ServiceWithChannel;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag;
@@ -837,6 +837,22 @@ public function testAsMonologProcessorAutoconfigurationWithPriority(): void
         ], $container->getDefinition(FooProcessorWithPriority::class)->getTag('monolog.processor'));
     }
 
+    /**
+     * @requires PHP 8.0
+     */
+    public function testWithLoggerChannelAutoconfiguration(): void
+    {
+        $container = $this->getContainer([], [
+            ServiceWithChannel::class => (new Definition(ServiceWithChannel::class))->setAutoconfigured(true),
+        ]);
+
+        $this->assertSame([
+            [
+                'channel' => 'fixture',
+            ],
+        ], $container->getDefinition(ServiceWithChannel::class)->getTag('monolog.logger'));
+    }
+
     protected function getContainer(array $config = [], array $thirdPartyDefinitions = []): ContainerBuilder
     {
         $container = new ContainerBuilder(new EnvPlaceholderParameterBag());