Add useful informations to logs

services.yml

services:
    monolog.processor.session_request:
        class: Acme\CoreBundle\Service\sessionRequestProcessor
        arguments:  [ @session, @service_container, @kernel ]
        tags:
            - { name: monolog.processor, method: processRecord }

sessionRequestProcessor.php

<?php

namespace Acme\CoreBundle\Service;

use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\Security\Core\SecurityContext;
use Symfony\Component\HttpKernel\Kernel;
use Acme\UserBundle\Entity\User;

/**
 * Class for adding the session and a random token to the log data
 *
 * (c) Alessandro Tagliapietra <tagliapietra.alessandro@gmail.com>
 */
class sessionRequestProcessor
{
    private $session;
    private $token;
    private $sessionId;
    private $securityContext;
    private $kernel;

    /**
     * Creates the service
     * 
     * @param Session   $session   Sets the internal session object
     * @param Container $container The service container
     * @param kernel    $kernel    The symfony kernel to get the environment from
     */
    public function __construct(Session $session, $container, Kernel $kernel)
    {
        $this->session = $session;
        $this->container = $container;
        $this->kernel = $kernel;
    }

    /**
     * Adds the session id to the log record to filter by session
     * Gets the session id from the session object but sometimes it's not yet initalized
     * So it gets directly from the PHPSESSID cookie
     * 
     * @param array $record the record array of informations
     * 
     * @return array $record the record array plus the session informations
     */
    public function processRecord(array $record)
    {
        if (null === $this->token) {
            try {
                if (!$this->session->getId()) {
                    if (isset($_COOKIE['PHPSESSID'])) {
                        $this->token = substr($_COOKIE['PHPSESSID'], 0, 8);
                    } else {
                        $this->token = 'null';
                    }
                } else {
                    $this->token = substr($this->session->getId(), 0, 8);
                }
            } catch (\RuntimeException $e) {
                $this->token = '????????';
            }
            $this->token .= '-' . substr(uniqid(), -8);
        }
        if (null === $this->sessionId) {
            try {
                if (!$this->session->getId()) {
                    if (isset($_COOKIE['PHPSESSID'])) {
                        $this->sessionId = $_COOKIE['PHPSESSID'];
                    } else {
                        $this->sessionId = 'null';
                    }
                } else {
                    $this->sessionId = $this->session->getId();
                }
            } catch (\RuntimeException $e) {
                $this->sessionId = '????????';
            }
        }
        $record['extra']['session'] = $this->sessionId;
        $record['extra']['token'] = $this->token;
        if (!is_null($this->container->get('security.context')->getToken()) && !is_null($this->container->get('security.context')->getToken()->getUser())) {
            if ($this->container->get('security.context')->getToken()->getUser() instanceof User) {
                $record['extra']['user'] = $this->container->get('security.context')->getToken()->getUser()->getUsername();
            } else {
                $record['extra']['user'] = $this->container->get('security.context')->getToken()->getUser();
            }
        }
        $record['extra']['environment'] = $this->kernel->getEnvironment();

        return $record;
    }
}