Symfony2 - 处理内核异常侦听器的请求/响应 [英] Symfony2 - Manipulate request/response from the Kernel Exception Listener

问题描述

我正在为一个网站建立一个管理面板，当管理应用程序发生404异常但仅时，我想更改调用的视图。 （路径：/ admin / *）

我已经超过了 error404.html .twig 查看（ app / Resources / TwigBundle / views / Exception / ）。

我想到了kernel.exception事件监听器，但现在我被困住了两件事：

• 加载另一个错误视图只有当路线以前缀开始时： / admin /

    $ route = $ event-> getRequest-> get（'_ route'） - > render（）
   //返回NULL 
    




• 调用 $ event-> container-> get（'templating'） - > render（）功能

当脚本失败时，我最终会出现无限循环（空白页）。

我唯一的工作是：

• 检索异常代码：

    $ exception = $ event-> getException（）; 
   $ code = $ exception-> getCode（）; 
    




• 创建新的回复：

    $ response = new Response（）; 
   $ event-> setResponse（$ response）; 
    

有关如何实现这一点的任何建议？ / p>

课程：

 命名空间Cmt\AdminBundle\EventListener; 
 
使用Symfony\Component\DependencyInjection\ContainerInterface; 
使用Symfony\Bundle\TwigBundle\TwigEngine; 
 
 class AdminActionListener 
 {
 / ** 
 * @var ContainerInterface 
 * / 
 protected $ container; 
 
 / ** 
 * @var TwigEngine 
 * / 
 protected $ templating; 
 
 
 / ** 
 * @param ContainerInterface $ container 
 * / 
 public function __construct（ContainerInterface $ container，TwigEngine $ templating）{
 // assign value（s）
 $ this-> container = $ container; 
 $ this-> templating = $ templating; 
} 
 
 / ** 
 * 
 * @param GetResponseForExceptionEvent $ event 
 * / 
 public function onKernelException（GetResponseForExceptionEvent $ event）
 {
 //获取异常
 $ exception = $ event-> getException（）; 
 
 //获取路径
 $ path = $ event-> getRequest（） - > getPathInfo（）; 
 
 / * 
 *仅对路径前缀/ admin / 
 * / 
 $ 
 $重新定向回应新的404错误视图
 * 
  

而services.yml：

  services：
 cmt_admin.exception.action_listener：
 class：Cmt\AdminBundle\EventListener\AdminActionListener 
 arguments：[@service_container] [@templating ] 
标签：
  -  {name：kernel.event_listener，event：kernel.exception，方法：onKernelException} 
  

解决方案

由于某种原因，这样做有效：

  / get exception 
 $ exception = $ event-> getException（）; 
 
 //获取路径
 $ path = $ event-> getRequest（） - > getPathInfo（）; 
 
 if（$ exception-> getStatusCode（）== 404&& strpos（$ path，'/ admin'）=== 0）{
 
 $ templateating = $ this-> container-> get（'templating'）; 
 
 $ response = new Response（$ templateating-> render（'CmtAdminBundle：Exception：error404.html.twig'，array（
'exception'=> $ exception 
）））; 
 
 $ event-> setResponse（$ response）; 
} 
  

这基本上是我以前用不同的语法做的...

@dmirkitanov无论如何，感谢您的帮助！

I am building an administration panel for a website and I would like to change the view called when a 404 exception occurs but only for the admin application. (path: /admin/*)

I have already overdid the error404.html.twig view (at app/Resources/TwigBundle/views/Exception/) for the website.

I thought of the kernel.exception event listener but now I am stuck with two things:

• Loading another error view only when the route starts with the prefix: /admin/

  $route = $event->getRequest->get('_route')->render()
  //returns NULL
  

• Calling the $event->container->get('templating')->render() function.

I end up with an infinite loop (blank page) as the script fails.

The only things I've got working are:

• Retrieving the exception code:

  $exception = $event->getException();
  $code = $exception->getCode();
  

• Creating a new response:

  $response = new Response();
  $event->setResponse($response);
  

Any suggestions on how to achieve this?

[EDIT]

The class:

namespace Cmt\AdminBundle\EventListener;

use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Bundle\TwigBundle\TwigEngine;

class AdminActionListener
{
    /**
     * @var ContainerInterface
     */
    protected $container;

    /**
     * @var TwigEngine
     */
    protected $templating;


    /**
     * @param ContainerInterface $container
     */
    public function __construct(ContainerInterface $container, TwigEngine $templating){
        // assign value(s)
        $this->container = $container;
        $this->templating = $templating;
    }

    /**
     * 
     * @param GetResponseForExceptionEvent $event
     */
    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        // get exception
        $exception = $event->getException();

        // get path
        $path = $event->getRequest()->getPathInfo();

        /*
        * Redirect response to new 404 error view only
        * on path prefix /admin/ 
            */
        }
}

And the services.yml:

services:
    cmt_admin.exception.action_listener:
        class: Cmt\AdminBundle\EventListener\AdminActionListener
        arguments: [@service_container] [@templating]
        tags:
            -   { name: kernel.event_listener, event: kernel.exception, method: onKernelException }

解决方案

For some reason, this worked:

// get exception
$exception = $event->getException();

// get path
$path = $event->getRequest()->getPathInfo();

if ($exception->getStatusCode() == 404 && strpos($path, '/admin') === 0){

    $templating = $this->container->get('templating');

    $response = new Response($templating->render('CmtAdminBundle:Exception:error404.html.twig', array(
        'exception' => $exception
    )));

    $event->setResponse($response);
}

Which is basically what I was doing earlier with a different syntax...

@dmirkitanov Anyway, thanks for your help !

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