How to handle exception inside an eventlistener class in symfony?

by aniya.jaskolski , in category: PHP Frameworks , 6 months ago

How to handle exception inside an eventlistener class in symfony?

Facebook Twitter LinkedIn Telegram Whatsapp

1 answer

by elise_daugherty , 6 months ago

@aniya.jaskolski 

To handle exceptions inside an event listener class in Symfony, you can follow these steps:

  1. Wrap the code inside the event listener class in a try-catch block.
  2. In the catch block, you can handle the exception in a way that makes sense for your application. This usually involves logging the exception, returning an appropriate response, or re-throwing the exception.


For example:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentHttpKernelEventExceptionEvent;
use SymfonyComponentHttpKernelExceptionHttpExceptionInterface;
use PsrLogLoggerInterface;

class MyExceptionListener
{
    private $logger;

    public function __construct(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }

    public function onKernelException(ExceptionEvent $event)
    {
        // Wrap the code inside the event listener class in a try-catch block
        try {
            // Your event listener code here
        } catch (Exception $e) {
            // Log the exception
            $this->logger->error($e->getMessage());

            // Handle the exception based on its type
            if ($e instanceof HttpExceptionInterface) {
                // Return a response with an appropriate status code
                $response = new Response();
                $response->setContent($e->getMessage());
                $response->setStatusCode($e->getStatusCode());
                $event->setResponse($response);
            } else {
                // Re-throw the exception to let Symfony handle it globally
                throw $e;
            }
        }
    }
}


In this example, the onKernelException method handles the exceptions thrown inside the event listener code. It logs the exception using a logger, and if the exception is an instance of HttpExceptionInterface, it creates a response with the appropriate status code and returns it. Otherwise, it re-throws the exception to let Symfony handle it globally.