Symfony2 Monolog : improve your logs

From WikiOD

Add user's details and posted parameters sent to logs[edit | edit source]

Logs are very important. Recreate an error context can be sometimes very painful due to the lack of information about how and when the error occurred.

This example shows:

  • How to add user's data in the error logs
  • How to add post parameters sent when an error occurred
  • How to use WebProcessor in order to add all data regarding the request like :
    • url
    • ip
    • http method
    • server
    • referrer

Service Configuration

    # Permits to convert logs in HTML format for email notification
        class: Monolog\Formatter\HtmlFormatter

    # Add request data (url, ip, http method, server, referrer)
        class: Monolog\Processor\WebProcessor
            - { name: monolog.processor, method: __invoke } 

    # Custom class to include user's data and posted parameters in the logs
        class: Company\ToolBoxBundle\Services\Monolog\ExtraProcessor
        arguments:  ["@security.token_storage"]
            - { name: monolog.processor }
            - { name: kernel.event_listener, event: kernel.request, method: onKernelRequest }

Service code

namespace Company\ToolBoxBundle\Services\Monolog;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;

class ExtraProcessor
    * @var string
    private $postParams = null;    

    * @var TokenStorageInterface
    private $tokenStorage = null;

    * @var \Company\UserBundle\Entity\User
    private $user = null;

    public function __construct(TokenStorageInterface $tokenStorage)
        $this->tokenStorage = $tokenStorage;

    // Called when an error occurred and a log (record) is creating
    public function __invoke(array $record)
        if (null !== $this->user) {
            // $this->user is your user's entity. Extract all pertinent data you would need. In this case, getUserDetails method create a summary including alias, name, role, ...
            $record['extra']['user'] = $this->user->getUserDetails();

        if (null !== $this->postParams) {
            // Includes all posted parameter when the error occurred
            $record['extra']['postParams'] = $this->postParams;

        return $record;

    public function onKernelRequest(GetResponseEvent $event)
        // Retain post parameters sent (serialized) in order to log them if needed
        $postParams = $event->getRequest()->request->all();
        if(false === empty($postParams)){
            $this->postParams = serialize($postParams);

        // Do not continue if user is not logged
        if (null === $token = $this->tokenStorage->getToken()) {

        if (!is_object($user = $token->getUser())) {
            // e.g. anonymous authentication

        // Retain the user entity in order to use it
        $this->user = $user;