Log errors from graphQl result

src/DependencyInjection/OverblogGraphQLExtension.php

@@ -187,7 +187,7 @@ private function setErrorHandler(array $config, ContainerBuilder $container): vo
 
             $errorHandlerListenerDefinition = $container->setDefinition(ErrorHandlerListener::class, new Definition(ErrorHandlerListener::class));
             $errorHandlerListenerDefinition->setPublic(true)
-                ->setArguments([new Reference($id), $config['errors_handler']['rethrow_internal_exceptions'], $config['errors_handler']['debug']])
+                ->setArguments([new Reference($id), new Reference(ErrorHandlerListener::DEFAULT_LOGGER_SERVICE), $config['errors_handler']['rethrow_internal_exceptions'], $config['errors_handler']['debug']])
                 ->addTag('kernel.event_listener', ['event' => Events::POST_EXECUTOR, 'method' => 'onPostExecutor'])
             ;
 

src/EventListener/ErrorHandlerListener.php

@@ -6,9 +6,13 @@
 
 use Overblog\GraphQLBundle\Error\ErrorHandler;
 use Overblog\GraphQLBundle\Event\ExecutorResultEvent;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
 
 final class ErrorHandlerListener
 {
+    public const DEFAULT_LOGGER_SERVICE = 'logger';
+
     /** @var ErrorHandler */
     private $errorHandler;
 
@@ -18,16 +22,29 @@ final class ErrorHandlerListener
     /** @var bool */
     private $debug;
 
-    public function __construct(ErrorHandler $errorHandler, $throwException = false, $debug = false)
-    {
+    /** @var LoggerInterface */
+    private $logger;
+
+    public function __construct(
+        ErrorHandler $errorHandler,
+        LoggerInterface $logger,
+        bool $throwException = false,
+        bool $debug = false
+    ) {
         $this->errorHandler = $errorHandler;
         $this->throwException = $throwException;
         $this->debug = $debug;
+        $this->logger = null === $logger ? new NullLogger() : $logger;
     }
 
     public function onPostExecutor(ExecutorResultEvent $executorResultEvent): void
     {
         $result = $executorResultEvent->getResult();
         $this->errorHandler->handleErrors($result, $this->throwException, $this->debug);
+        $result = $result->toArray();
+
+        if (isset($result['errors'])) {
+            $this->logger->error(__METHOD__.' : '.\json_encode($result['errors']));
+        }
     }
 }