Show better message when SQLite is not enabled

app/config/services.yml

@@ -44,7 +44,8 @@ services:
     # the list of events listened by that class.
     # See http://symfony.com/doc/current/event_dispatcher.html#creating-an-event-subscriber
     app.console_subscriber:
-        class: AppBundle\EventListener\ConsoleEventSubscriber
+        class: AppBundle\EventListener\CheckSQLiteEventSubscriber
+        arguments: ['@doctrine.orm.entity_manager']
         tags:
             - { name: kernel.event_subscriber }
 

src/AppBundle/EventListener/ConsoleEventSubscriber.php → src/AppBundle/EventListener/CheckSQLiteEventSubscriber.php

@@ -11,10 +11,14 @@
 
 namespace AppBundle\EventListener;
 
+use Doctrine\DBAL\Exception\DriverException;
+use Doctrine\ORM\EntityManager;
 use Symfony\Component\Console\ConsoleEvents;
 use Symfony\Component\Console\Event\ConsoleExceptionEvent;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
 
 /**
  * This application uses by default an SQLite database to store its information.
@@ -24,8 +28,23 @@
  *
  * @author Javier Eguiluz <[email protected]>
  */
-class ConsoleEventSubscriber implements EventSubscriberInterface
+class CheckSQLiteEventSubscriber implements EventSubscriberInterface
 {
+    /**
+     * @var EntityManager
+     */
+    private $entityManager;
+
+    /**
+     * CheckSQLiteEventSubscriber constructor.
+     *
+     * @param EntityManager $entityManager
+     */
+    public function __construct(EntityManager $entityManager)
+    {
+        $this->entityManager = $entityManager;
+    }
+
     // Event Subscribers must define this method to declare the events they
     // listen to. You can listen to several events, execute more than one method
     // for each event and set the priority of each event too.
@@ -36,6 +55,8 @@ public static function getSubscribedEvents()
             // Exceptions are one of the events defined by the Console. See the
             // rest here: http://symfony.com/doc/current/components/console/events.html
             ConsoleEvents::EXCEPTION => 'handleDatabaseExceptions',
+            // See: http://api.symfony.com/3.2/Symfony/Component/HttpKernel/KernelEvents.html
+            KernelEvents::EXCEPTION => 'onKernelException',
         ];
     }
 
@@ -51,10 +72,43 @@ public function handleDatabaseExceptions(ConsoleExceptionEvent $event)
         $commandNames = ['doctrine:fixtures:load', 'doctrine:database:create', 'doctrine:schema:create', 'doctrine:database:drop'];
 
         if (in_array($event->getCommand()->getName(), $commandNames)) {
-            if (!extension_loaded('sqlite3')) {
+            if ($this->isSQLitePlatform() && !extension_loaded('sqlite3')) {
                 $io = new SymfonyStyle($event->getInput(), $event->getOutput());
                 $io->error('This command requires to have the "sqlite3" PHP extension enabled because, by default, the Symfony Demo application uses SQLite to store its information.');
             }
         }
     }
+
+    /**
+     * This method is triggered when kernel exception occurs. And checks if sqlite extension is enabled.
+     *
+     * @param GetResponseForExceptionEvent $event
+     */
+    public function onKernelException(GetResponseForExceptionEvent $event)
+    {
+        $exception = $event->getException();
+        // Since any exception thrown during a Twig template rendering is wrapped in a Twig_Error_Runtime.
+        // We must get the original exception.
+        $previousException = $exception->getPrevious();
+
+        // Driver exception may happen in controller or in twig template rendering
+        $isDriverException = ($exception instanceof DriverException || $previousException instanceof DriverException);
+
+        // Check if SQLite is enabled
+        if ($isDriverException && $this->isSQLitePlatform() && !extension_loaded('sqlite3')) {
+            $event->setException(new \Exception('PHP extension "sqlite3" must be enabled because, by default, the Symfony Demo application uses SQLite to store its information.'));
+        }
+    }
+
+    /**
+     * Check if demo application is configured to use SQLite as database.
+     *
+     * @return bool
+     */
+    private function isSQLitePlatform()
+    {
+        $databasePlatform = $this->entityManager->getConnection()->getDatabasePlatform();
+
+        return $databasePlatform ? $databasePlatform->getName() === 'sqlite' : false;
+    }
 }