Symfony2 自定义错误异常监听器 - 渲染模板或传递给控制器 [英] Symfony2 Custom Error Exception Listener - Rendering templates or passing to a controller
问题描述
I'm trying to work out the best way of handling custom error pages within Symfony2.This includes 500 and 404's etc.
I can create my own custom templates (error404.html.twig etc) and render these out fine, the issue is , the app requires a few variables be passed into the base template for the page to remain consistent. Using the built in exception handler results in required variables not being available.
I have successfully setup a custom Exception Event Listener, and registered it as a service:
namespace MyCoMyBundleListener;
use SymfonyComponentHttpKernelEventGetResponseForExceptionEvent;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentHttpKernelExceptionHttpExceptionInterface;
use SymfonyComponentDependencyInjectionContainerInterface;
use SymfonyBundleTwigBundleTwigEngine;
use SensioBundleFrameworkExtraBundleConfigurationTemplate;
class MyErrorExceptionListener
{
public function onKernelException(GetResponseForExceptionEvent $event)
{
// We get the exception object from the received event
$exception = $event->getException();
if($exception->getStatusCode() == 404)
{
//$engine = $this->container->get('templating');
//$content = $engine->render('MyBundle:Default:error404.html.twig');
//return $response = new Response($content);
/* Also Tried */
//$templating = $this->container->get('templating');
//return $this->render('MyBundle:Default:index.html.twig');
$response = new Response($templating->render('MyBundle:Exception:error404.html.twig', array(
'exception' => $exception
)));
$event->setResponse($response);
}
}
}
This doesn't work , as :$container is not available , meaning I cannot render my custom page.
So two questions really , is this the correct way to handle custom error pages, or should I pass the response off to a controller? If so , whats the best way of doing that?
If this is correct , how can I make the templating engine available within my Listener ?
You should add into yours Listener
/**
*
* @var ContainerInterface
*/
private $container;
function __construct($container) {
$this->container = $container;
}
How do you register your Listener? You should register Listener like Service
Like that
core.exceptlistener:
class: %core.exceptlistener.class%
arguments: [@service_container]
tags:
- { name: kernel.event_listener, event: kernel.exception, method: onKernelException, priority: 200 }
The best way is don't use service_container. The best way is register only necessary services.
Like that
/**
*
* @var Twig_Environment
*/
private $twig;
function __construct($twig) {
$this->twig = $twig;
}
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