Contao\CoreBundle\Monolog\ContaoTableProcessor::updateUsername PHP Method

    private function updateUsername(ContaoContext $context)
    {
        if (null !== $context->getUsername()) {
            return;
        }
        $token = $this->tokenStorage->getToken();
        $context->setUsername(null === $token ? 'N/A' : $token->getUsername());
    }