how to pass username to rollbar via monolog, symfony2 - symfony

Question

I am using rollbar.com to collect all details about exceptions in symfony2 app. However I don't understand how can I configure monolog so it would pass username and user id to rollbar.
I see that I can pass rollbar config as shown here and I am thinking person_fn is what I need. Still I don't know where to put this function (this should be in service because I need to check security token) and how to pass it to rollbar.
# config_prod.yml
rollbar:
type: rollbar
level: error
token: %rollbar_token%
config:
person_fn: getUserForRollbarRightAboutNowOrSomething

Answer 1

Found solution:
update monolog/monolog bundle to at least 1.17.0 version.
create ContextProcessor and update user information
#src/AppBundle/Monolog/RollbarContextProcessor
namespace AppBundle\Monolog;
use AppBundle\Entity\User;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
class RollbarContextProcessor
{
private $tokenStorage;
public function __construct(TokenStorageInterface $tokenStorage)
{
$this->tokenStorage = $tokenStorage;
}
public function processRecord($record)
{
if ($this->tokenStorage->getToken()) {
$user = $this->tokenStorage->getToken()->getUser();
if ($user instanceof User) {
$record['context']['payload']['person'] = [
'id' => $user->getId(),
'username' => $user->getUsername(),
'email' => $user->getEmail(),
];
}
}
return $record;
}
}
configure ContextProcessor as service with monolog.processor tag.
# app/config/config_prod.yml
services:
monolog.processor.rollbar_context:
class: AppBundle\Monolog\RollbarContextProcessor
arguments: [#security.token_storage]
tags:
- { name: monolog.processor, method: processRecord, handler: rollbar }
monolog:
handlers:
rollbar:
type: rollbar
level: error
token: %rollbar_token%

Answer 2

Your question has two parts:
Rollbar
person_fn is exactly what you need. You should be able to add a reference to the function by using a string (e.g.: "MyClass::static_function_reference" or "my_function_name").
Symfony
Disclaimer: I don't use or know much about Symfony.
This question has some excellent examples of how to get the current user in Symfony. (Punch line: in a controller you can call $this.getUser())
This question has a good example of how to inject the current user in a service. (Make a Twig Extension that depends on the SecurityContext or TokenStorage, use those dependencies to get a user objet).
Finally, there's the classic PHP move: as soon as you have a user add it to $_REQUEST. I'm not sure if Symfony co-opts this, but it'd be a valid way in a non-framework PHP application.