Add autoconfigure for services extending PsrProcess interface

This will allow to Symfony users that have autoconfigure/autowiring enabled to avoid defining
explicitly the producer service and its tag. Now, the symfony container does it automatically.

Author: Matías Navarro Carter

pkg/enqueue-bundle/DependencyInjection/EnqueueExtension.php

@@ -11,6 +11,7 @@
 use Enqueue\Symfony\DefaultTransportFactory;
 use Enqueue\Symfony\DriverFactoryInterface;
 use Enqueue\Symfony\TransportFactoryInterface;
+use Interop\Queue\PsrProcessor;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -72,6 +73,9 @@ public function load(array $configs, ContainerBuilder $container)
         $loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('services.yml');
 
+        $container->registerForAutoconfiguration(PsrProcessor::class)
+            ->addTag('enqueue.client.processor');
+
         foreach ($config['transport'] as $name => $transportConfig) {
             $this->factories[$name]->createConnectionFactory($container, $transportConfig);
             $this->factories[$name]->createContext($container, $transportConfig);

pkg/enqueue-bundle/Tests/Unit/DependencyInjection/EnqueueExtensionTest.php

@@ -17,6 +17,7 @@
 use Enqueue\Symfony\MissingTransportFactory;
 use Enqueue\Symfony\TransportFactoryInterface;
 use Enqueue\Test\ClassExtensionTrait;
+use Interop\Queue\PsrProcessor;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -633,6 +634,21 @@ public function testShouldThrowIfPackageShouldBeInstalledToUseTransport()
         ]], $container);
     }
 
+    public function testShouldLoadProcessAutoconfigureChildDefinition()
+    {
+        $container = $this->getContainerBuilder(true);
+        $extension = new EnqueueExtension();
+
+        $extension->load([[
+            'client' => [],
+            'transport' => [],
+        ]], $container);
+
+        $autoconfigured = $container->getAutoconfiguredInstanceof();
+        self::assertArrayHasKey(PsrProcessor::class, $autoconfigured);
+        self::assertTrue($autoconfigured[PsrProcessor::class]->hasTag('enqueue.client.processor'));
+    }
+
     /**
      * @param bool $debug
      *