Add Exception Event Listener

Author: cvergne

EventListener/ExceptionListener.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace TheCodingMachine\GraphQLite\Bundle\EventListener;
+
+use GraphQL\Error\Error;
+use GraphQL\Executor\ExecutionResult;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpKernel\Event\ExceptionEvent;
+use TheCodingMachine\GraphQLite\Exceptions\GraphQLExceptionInterface;
+use TheCodingMachine\GraphQLite\Http\HttpCodeDecider;
+use TheCodingMachine\GraphQLite\Http\HttpCodeDeciderInterface;
+
+class ExceptionListener
+{
+    private readonly HttpCodeDeciderInterface $httpCodeDecider;
+
+    public function __construct(
+        ?HttpCodeDeciderInterface $httpCodeDecider = null,
+    ) {
+        $this->httpCodeDecider = $httpCodeDecider ?? new HttpCodeDecider();
+    }
+
+    public function onKernelException(ExceptionEvent $event): void
+    {
+        $exception = $event->getThrowable();
+
+        if ($exception instanceof GraphQLExceptionInterface) {
+            $result = new ExecutionResult(
+                errors: [new Error(
+                    message: $exception->getMessage(),
+                    previous: $exception,
+                    extensions: $exception->getExtensions()
+                )]
+            );
+
+            $response = new JsonResponse($result->toArray(), $this->httpCodeDecider->decideHttpStatusCode($result));
+
+            $event->setResponse($response);
+        }
+    }
+}

src/Resources/config/container/graphqlite.xml

@@ -87,6 +87,10 @@
             <tag name="routing.route_loader"/>
         </service>
 
+        <service id="TheCodingMachine\GraphQLite\Bundle\EventListener\ExceptionListener">
+            <tag name="kernel.event_listener" event="kernel.exception" method="onKernelException" />
+        </service>
+
         <service id="TheCodingMachine\GraphQLite\Bundle\Mappers\RequestParameterMiddleware">
             <tag name="graphql.parameter_middleware"/>
         </service>