Show better message when SQLite is not enabled

app/config/services.yml

@@ -36,7 +36,7 @@ services:
     # subscriber includes a method that returns the list of listened events.
     # See http://symfony.com/doc/current/event_dispatcher.html#creating-an-event-subscriber
     app.console_subscriber:
-        class: AppBundle\EventListener\ConsoleEventSubscriber
+        class: AppBundle\EventListener\CheckSQLiteEventSubscriber
         tags:
             - { name: kernel.event_subscriber }
 

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

@@ -11,10 +11,13 @@
 
 namespace AppBundle\EventListener;
 
+use Doctrine\DBAL\Exception\DriverException;
 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.
@@ -24,7 +27,7 @@
  *
  * @author Javier Eguiluz <[email protected]>
  */
-class ConsoleEventSubscriber implements EventSubscriberInterface
+class CheckSQLiteEventSubscriber implements EventSubscriberInterface
 {
     // Event Subscribers must define this method to declare the events they
     // listen to. You can listen to several events, execute more than one method
@@ -36,6 +39,8 @@ 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',
         ];
     }
 
@@ -57,4 +62,21 @@ public function handleDatabaseExceptions(ConsoleExceptionEvent $event)
             }
         }
     }
+
+    /**
+     * 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 = $exception->getPrevious();
+
+        if ($previousException instanceof DriverException && !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.'));
+        }
+    }
 }