MonologExtension.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Bundle\MonologBundle\DependencyInjection;

use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\Reference;

/**
 * MonologExtension is an extension for the Monolog library.
 *
 * @author Jordi Boggiano <j.boggiano@seld.be>
 * @author Christophe Coevoet <stof@notk.org>
 */
class MonologExtension extends Extension
{
    private $nestedHandlers = array();

    private $swiftMailerHandlers = array();

    private function levelToMonologConst($level)
    {
        return is_int($level) ? $level : constant('Monolog\Logger::'.strtoupper($level));
    }

    /**
     * Loads the Monolog configuration.
     *
     * @param array            $configs   An array of configuration settings
     * @param ContainerBuilder $container A ContainerBuilder instance
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = $this->getConfiguration($configs, $container);
        $config = $this->processConfiguration($configuration, $configs);


        if (isset($config['handlers'])) {
            $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
            $loader->load('monolog.xml');

            $container->setParameter('monolog.use_microseconds', $config['use_microseconds']);

            // always autowire the main logger, require Symfony >= 2.8, < 3.3
            if (!method_exists('Symfony\Component\DependencyInjection\ContainerBuilder', 'fileExists') && method_exists('Symfony\Component\DependencyInjection\Definition', 'addAutowiringType')) {
                $container->getDefinition('monolog.logger')->addAutowiringType('Psr\Log\LoggerInterface');
            }

            $handlers = array();

            foreach ($config['handlers'] as $name => $handler) {
                $handlers[$handler['priority']][] = array(
                    'id' => $this->buildHandler($container, $name, $handler),
                    'channels' => empty($handler['channels']) ? null : $handler['channels'],
                );
            }

            $container->setParameter(
                'monolog.swift_mailer.handlers',
                $this->swiftMailerHandlers
            );

            ksort($handlers);
            $sortedHandlers = array();
            foreach ($handlers as $priorityHandlers) {
                foreach (array_reverse($priorityHandlers) as $handler) {
                    $sortedHandlers[] = $handler;
                }
            }

            $handlersToChannels = array();
            foreach ($sortedHandlers as $handler) {
                if (!in_array($handler['id'], $this->nestedHandlers)) {
                    $handlersToChannels[$handler['id']] = $handler['channels'];
                }
            }
            $container->setParameter('monolog.handlers_to_channels', $handlersToChannels);

            if (PHP_VERSION_ID < 70000) {
                $this->addClassesToCompile(array(
                    'Monolog\\Formatter\\FormatterInterface',
                    'Monolog\\Formatter\\LineFormatter',
                    'Monolog\\Handler\\HandlerInterface',
                    'Monolog\\Handler\\AbstractHandler',
                    'Monolog\\Handler\\AbstractProcessingHandler',
                    'Monolog\\Handler\\StreamHandler',
                    'Monolog\\Handler\\FingersCrossedHandler',
                    'Monolog\\Handler\\FilterHandler',
                    'Monolog\\Handler\\TestHandler',
                    'Monolog\\Logger',
                    'Symfony\\Bridge\\Monolog\\Logger',
                    'Monolog\\Handler\\FingersCrossed\\ActivationStrategyInterface',
                    'Monolog\\Handler\\FingersCrossed\\ErrorLevelActivationStrategy',
                ));
            }
        }

        $container->setParameter('monolog.additional_channels', isset($config['channels']) ? $config['channels'] : array());
    }

    /**
     * Returns the base path for the XSD files.
     *
     * @return string The XSD base path
     */
    public function getXsdValidationBasePath()
    {
        return __DIR__.'/../Resources/config/schema';
    }

    public function getNamespace()
    {
        return 'http://symfony.com/schema/dic/monolog';
    }

    private function buildHandler(ContainerBuilder $container, $name, array $handler)
    {
        $handlerId = $this->getHandlerId($name);
        if ('service' === $handler['type']) {
            $container->setAlias($handlerId, $handler['id']);

            if (!empty($handler['nested']) && true === $handler['nested']) {
                $this->markNestedHandler($handlerId);
            }

            return $handlerId;
        }

        $definition = new Definition($this->getHandlerClassByType($handler['type']));

        $handler['level'] = $this->levelToMonologConst($handler['level']);

        if ($handler['include_stacktraces']) {
            $definition->setConfigurator(array('Symfony\\Bundle\\MonologBundle\\MonologBundle', 'includeStacktraces'));
        }

        if (null === $handler['process_psr_3_messages']) {
            $handler['process_psr_3_messages'] = !isset($handler['handler']) && !$handler['members'];
        }

        if ($handler['process_psr_3_messages']) {
            $processorId = 'monolog.processor.psr_log_message';
            if (!$container->hasDefinition($processorId)) {
                $processor = new Definition('Monolog\\Processor\\PsrLogMessageProcessor');
                $processor->setPublic(false);
                $container->setDefinition($processorId, $processor);
            }

            $definition->addMethodCall('pushProcessor', array(new Reference($processorId)));
        }

        switch ($handler['type']) {
        case 'stream':
            $definition->setArguments(array(
                $handler['path'],
                $handler['level'],
                $handler['bubble'],
                $handler['file_permission'],
            ));
            break;

        case 'console':
            $definition->setArguments(array(
                null,
                $handler['bubble'],
                isset($handler['verbosity_levels']) ? $handler['verbosity_levels'] : array(),
                $handler['console_formater_options']
            ));
            $definition->addTag('kernel.event_subscriber');
            break;

        case 'firephp':
            $definition->setArguments(array(
                $handler['level'],
                $handler['bubble'],
            ));
            $definition->addTag('kernel.event_listener', array('event' => 'kernel.response', 'method' => 'onKernelResponse'));
            break;

        case 'gelf':
            if (isset($handler['publisher']['id'])) {
                $publisher = new Reference($handler['publisher']['id']);
            } elseif (class_exists('Gelf\Transport\UdpTransport')) {
                $transport = new Definition("Gelf\Transport\UdpTransport", array(
                    $handler['publisher']['hostname'],
                    $handler['publisher']['port'],
                    $handler['publisher']['chunk_size'],
                ));
                $transport->setPublic(false);

                $publisher = new Definition('Gelf\Publisher', array());
                $publisher->addMethodCall('addTransport', array($transport));
                $publisher->setPublic(false);
            } elseif (class_exists('Gelf\MessagePublisher')) {
                $publisher = new Definition('Gelf\MessagePublisher', array(
                    $handler['publisher']['hostname'],
                    $handler['publisher']['port'],
                    $handler['publisher']['chunk_size'],
                ));

                $publisher->setPublic(false);
            } else {
                throw new \RuntimeException('The gelf handler requires the graylog2/gelf-php package to be installed');
            }

            $definition->setArguments(array(
                $publisher,
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'mongo':
            if (isset($handler['mongo']['id'])) {
                $client = new Reference($handler['mongo']['id']);
            } else {
                $server = 'mongodb://';

                if (isset($handler['mongo']['user'])) {
                    $server .= $handler['mongo']['user'].':'.$handler['mongo']['pass'].'@';
                }

                $server .= $handler['mongo']['host'].':'.$handler['mongo']['port'];

                $client = new Definition('MongoClient', array(
                    $server,
                ));

                $client->setPublic(false);
            }

            $definition->setArguments(array(
                $client,
                $handler['mongo']['database'],
                $handler['mongo']['collection'],
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'elasticsearch':
            if (isset($handler['elasticsearch']['id'])) {
                $elasticaClient = new Reference($handler['elasticsearch']['id']);
            } else {
                // elastica client new definition
                $elasticaClient = new Definition('Elastica\Client');
                $elasticaClientArguments = array(
                    'host' => $handler['elasticsearch']['host'],
                    'port' => $handler['elasticsearch']['port'],
                    'transport' => $handler['elasticsearch']['transport'],
                );

                if (isset($handler['elasticsearch']['user']) && isset($handler['elasticsearch']['password'])) {
                    $elasticaClientArguments = array_merge(
                        $elasticaClientArguments,
                        array(
                            'headers' => array(
                                'Authorization' => 'Basic ' . base64_encode($handler['elasticsearch']['user'] . ':' . $handler['elasticsearch']['password'])
                            )
                        )
                    );
                }

                $elasticaClient->setArguments(array(
                    $elasticaClientArguments
                ));

                $elasticaClient->setPublic(false);
            }

            // elastica handler definition
            $definition->setArguments(array(
                $elasticaClient,
                array(
                    'index' => $handler['index'],
                    'type' => $handler['document_type'],
                    'ignore_error' => $handler['ignore_error']
                ),
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'chromephp':
            $definition->setArguments(array(
                $handler['level'],
                $handler['bubble'],
            ));
            $definition->addTag('kernel.event_listener', array('event' => 'kernel.response', 'method' => 'onKernelResponse'));
            break;

        case 'rotating_file':
            $definition->setArguments(array(
                $handler['path'],
                $handler['max_files'],
                $handler['level'],
                $handler['bubble'],
                $handler['file_permission'],
            ));
            $definition->addMethodCall('setFilenameFormat', array(
                $handler['filename_format'],
                $handler['date_format'],
            ));
            break;

        case 'fingers_crossed':
            $handler['action_level'] = $this->levelToMonologConst($handler['action_level']);
            if (null !== $handler['passthru_level']) {
                $handler['passthru_level'] = $this->levelToMonologConst($handler['passthru_level']);
            }
            $nestedHandlerId = $this->getHandlerId($handler['handler']);
            $this->markNestedHandler($nestedHandlerId);

            if (isset($handler['activation_strategy'])) {
                $activation = new Reference($handler['activation_strategy']);
            } elseif (!empty($handler['excluded_404s'])) {
                $activationDef = new Definition('Symfony\Bridge\Monolog\Handler\FingersCrossed\NotFoundActivationStrategy', array(
                    new Reference('request_stack'),
                    $handler['excluded_404s'],
                    $handler['action_level']
                ));
                $container->setDefinition($handlerId.'.not_found_strategy', $activationDef);
                $activation = new Reference($handlerId.'.not_found_strategy');
            } elseif (!empty($handler['excluded_http_codes'])) {
                if (!class_exists('Symfony\Bridge\Monolog\Handler\FingersCrossed\HttpCodeActivationStrategy')) {
                    throw new \LogicException('"excluded_http_codes" cannot be used as your version of Monolog bridge does not support it.');
                }
                $activationDef = new Definition('Symfony\Bridge\Monolog\Handler\FingersCrossed\HttpCodeActivationStrategy', array(
                    new Reference('request_stack'),
                    $handler['excluded_http_codes'],
                    $handler['action_level']
                ));
                $container->setDefinition($handlerId.'.http_code_strategy', $activationDef);
                $activation = new Reference($handlerId.'.http_code_strategy');
            } else {
                $activation = $handler['action_level'];
            }

            $definition->setArguments(array(
                new Reference($nestedHandlerId),
                $activation,
                $handler['buffer_size'],
                $handler['bubble'],
                $handler['stop_buffering'],
                $handler['passthru_level'],
            ));
            break;

        case 'filter':
            $handler['min_level'] = $this->levelToMonologConst($handler['min_level']);
            $handler['max_level'] = $this->levelToMonologConst($handler['max_level']);
            foreach (array_keys($handler['accepted_levels']) as $k) {
                $handler['accepted_levels'][$k] = $this->levelToMonologConst($handler['accepted_levels'][$k]);
            }

            $nestedHandlerId = $this->getHandlerId($handler['handler']);
            $this->markNestedHandler($nestedHandlerId);
            $minLevelOrList = !empty($handler['accepted_levels']) ? $handler['accepted_levels'] : $handler['min_level'];

            $definition->setArguments(array(
                new Reference($nestedHandlerId),
                $minLevelOrList,
                $handler['max_level'],
                $handler['bubble'],
            ));
            break;

        case 'buffer':
            $nestedHandlerId = $this->getHandlerId($handler['handler']);
            $this->markNestedHandler($nestedHandlerId);

            $definition->setArguments(array(
                new Reference($nestedHandlerId),
                $handler['buffer_size'],
                $handler['level'],
                $handler['bubble'],
                $handler['flush_on_overflow'],
            ));
            break;

        case 'deduplication':
            $nestedHandlerId = $this->getHandlerId($handler['handler']);
            $this->markNestedHandler($nestedHandlerId);
            $defaultStore = '%kernel.cache_dir%/monolog_dedup_'.sha1($handlerId);

            $definition->setArguments(array(
                new Reference($nestedHandlerId),
                isset($handler['store']) ? $handler['store'] : $defaultStore,
                $handler['deduplication_level'],
                $handler['time'],
                $handler['bubble'],
            ));
            break;

        case 'group':
        case 'whatfailuregroup':
            $references = array();
            foreach ($handler['members'] as $nestedHandler) {
                $nestedHandlerId = $this->getHandlerId($nestedHandler);
                $this->markNestedHandler($nestedHandlerId);
                $references[] = new Reference($nestedHandlerId);
            }

            $definition->setArguments(array(
                $references,
                $handler['bubble'],
            ));
            break;

        case 'syslog':
            $definition->setArguments(array(
                $handler['ident'],
                $handler['facility'],
                $handler['level'],
                $handler['bubble'],
                $handler['logopts'],
            ));
            break;

        case 'syslogudp':
            $definition->setArguments(array(
                $handler['host'],
                $handler['port'],
                $handler['facility'],
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'swift_mailer':
            if (isset($handler['email_prototype'])) {
                if (!empty($handler['email_prototype']['method'])) {
                    $prototype = array(new Reference($handler['email_prototype']['id']), $handler['email_prototype']['method']);
                } else {
                    $prototype = new Reference($handler['email_prototype']['id']);
                }
            } else {
                $messageFactory = new Definition('Symfony\Bundle\MonologBundle\SwiftMailer\MessageFactory');
                $messageFactory->setLazy(true);
                $messageFactory->setPublic(false);
                $messageFactory->setArguments(array(
                    new Reference($handler['mailer']),
                    $handler['from_email'],
                    $handler['to_email'],
                    $handler['subject'],
                    $handler['content_type']
                ));

                $messageFactoryId = sprintf('%s.mail_message_factory', $handlerId);
                $container->setDefinition($messageFactoryId, $messageFactory);
                // set the prototype as a callable
                $prototype = array(new Reference($messageFactoryId), 'createMessage');
            }
            $definition->setArguments(array(
                new Reference($handler['mailer']),
                $prototype,
                $handler['level'],
                $handler['bubble'],
            ));

            $this->swiftMailerHandlers[] = $handlerId;
            $definition->addTag('kernel.event_listener', array('event' => 'kernel.terminate', 'method' => 'onKernelTerminate'));
            $definition->addTag('kernel.event_listener', array('event' => 'console.terminate', 'method' => 'onCliTerminate'));
            break;

        case 'native_mailer':
            $definition->setArguments(array(
                $handler['to_email'],
                $handler['subject'],
                $handler['from_email'],
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'socket':
            $definition->setArguments(array(
                $handler['connection_string'],
                $handler['level'],
                $handler['bubble'],
            ));
            if (isset($handler['timeout'])) {
                $definition->addMethodCall('setTimeout', array($handler['timeout']));
            }
            if (isset($handler['connection_timeout'])) {
                $definition->addMethodCall('setConnectionTimeout', array($handler['connection_timeout']));
            }
            if (isset($handler['persistent'])) {
                $definition->addMethodCall('setPersistent', array($handler['persistent']));
            }
            break;

        case 'pushover':
            $definition->setArguments(array(
                $handler['token'],
                $handler['user'],
                $handler['title'],
                $handler['level'],
                $handler['bubble'],
            ));
            if (isset($handler['timeout'])) {
                $definition->addMethodCall('setTimeout', array($handler['timeout']));
            }
            if (isset($handler['connection_timeout'])) {
                $definition->addMethodCall('setConnectionTimeout', array($handler['connection_timeout']));
            }
            break;

        case 'hipchat':
            $definition->setArguments(array(
                $handler['token'],
                $handler['room'],
                $handler['nickname'],
                $handler['notify'],
                $handler['level'],
                $handler['bubble'],
                $handler['use_ssl'],
                $handler['message_format'],
                !empty($handler['host']) ? $handler['host'] : 'api.hipchat.com',
                !empty($handler['api_version']) ? $handler['api_version'] : 'v1',
            ));
            if (isset($handler['timeout'])) {
                $definition->addMethodCall('setTimeout', array($handler['timeout']));
            }
            if (isset($handler['connection_timeout'])) {
                $definition->addMethodCall('setConnectionTimeout', array($handler['connection_timeout']));
            }
            break;

        case 'slack':
            $definition->setArguments(array(
                $handler['token'],
                $handler['channel'],
                $handler['bot_name'],
                $handler['use_attachment'],
                $handler['icon_emoji'],
                $handler['level'],
                $handler['bubble'],
                $handler['use_short_attachment'],
                $handler['include_extra'],
            ));
            if (isset($handler['timeout'])) {
                $definition->addMethodCall('setTimeout', array($handler['timeout']));
            }
            if (isset($handler['connection_timeout'])) {
                $definition->addMethodCall('setConnectionTimeout', array($handler['connection_timeout']));
            }
            break;

        case 'slackwebhook':
            $definition->setArguments(array(
                $handler['webhook_url'],
                $handler['channel'],
                $handler['bot_name'],
                $handler['use_attachment'],
                $handler['icon_emoji'],
                $handler['use_short_attachment'],
                $handler['include_extra'],
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'slackbot':
            $definition->setArguments(array(
                $handler['team'],
                $handler['token'],
                urlencode($handler['channel']),
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'cube':
            $definition->setArguments(array(
                $handler['url'],
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'amqp':
            $definition->setArguments(array(
                new Reference($handler['exchange']),
                $handler['exchange_name'],
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'error_log':
            $definition->setArguments(array(
                $handler['message_type'],
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        case 'raven':
            if (null !== $handler['client_id']) {
                $clientId = $handler['client_id'];
            } else {
                $client = new Definition('Raven_Client', array(
                    $handler['dsn'],
                    array('auto_log_stacks' => $handler['auto_log_stacks'])
                ));
                $client->setPublic(false);
                $clientId = 'monolog.raven.client.'.sha1($handler['dsn']);
                $container->setDefinition($clientId, $client);
            }
            $definition->setArguments(array(
                new Reference($clientId),
                $handler['level'],
                $handler['bubble'],
            ));
            if (!empty($handler['release'])) {
                $definition->addMethodCall('setRelease', array($handler['release']));
            }
            break;

        case 'loggly':
            $definition->setArguments(array(
                $handler['token'],
                $handler['level'],
                $handler['bubble'],
            ));
            if (!empty($handler['tags'])) {
                $definition->addMethodCall('setTag', array(implode(',', $handler['tags'])));
            }
            break;

        case 'logentries':
            $definition->setArguments(array(
                $handler['token'],
                $handler['use_ssl'],
                $handler['level'],
                $handler['bubble'],
            ));
            if (isset($handler['timeout'])) {
                $definition->addMethodCall('setTimeout', array($handler['timeout']));
            }
            if (isset($handler['connection_timeout'])) {
                $definition->addMethodCall('setConnectionTimeout', array($handler['connection_timeout']));
            }
            break;

        case 'flowdock':
            $definition->setArguments(array(
                $handler['token'],
                $handler['level'],
                $handler['bubble'],
            ));

            if (empty($handler['formatter'])) {
                $formatter = new Definition("Monolog\Formatter\FlowdockFormatter", array(
                    $handler['source'],
                    $handler['from_email'],
                ));
                $formatterId = 'monolog.flowdock.formatter.'.sha1($handler['source'].'|'.$handler['from_email']);
                $formatter->setPublic(false);
                $container->setDefinition($formatterId, $formatter);

                $definition->addMethodCall('setFormatter', array(new Reference($formatterId)));
            }
            break;

        case 'rollbar':
            if (!empty($handler['id'])) {
                $rollbarId = $handler['id'];
            } else {
                $config = $handler['config'] ?: array();
                $config['access_token'] = $handler['token'];
                $rollbar = new Definition('RollbarNotifier', array(
                    $config,
                ));
                $rollbarId = 'monolog.rollbar.notifier.'.sha1(json_encode($config));
                $rollbar->setPublic(false);
                $container->setDefinition($rollbarId, $rollbar);
            }

            $definition->setArguments(array(
                new Reference($rollbarId),
                $handler['level'],
                $handler['bubble'],
            ));
            break;
        case 'newrelic':
            $definition->setArguments(array(
                $handler['level'],
                $handler['bubble'],
                $handler['app_name'],
            ));
            break;
        case 'server_log':
            if (!class_exists('Symfony\Bridge\Monolog\Handler\ServerLogHandler')) {
                throw new \RuntimeException('The ServerLogHandler is not available. Please update "symfony/monolog-bridge" to 3.3.');
            }

            $definition->setArguments(array(
                $handler['host'],
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        // Handlers using the constructor of AbstractHandler without adding their own arguments
        case 'browser_console':
        case 'test':
        case 'null':
        case 'debug':
            $definition->setArguments(array(
                $handler['level'],
                $handler['bubble'],
            ));
            break;

        default:
            $nullWarning = '';
            if ($handler['type'] == '') {
                $nullWarning = ', if you meant to define a null handler in a yaml config, make sure you quote "null" so it does not get converted to a php null';
            }

            throw new \InvalidArgumentException(sprintf('Invalid handler type "%s" given for handler "%s"' . $nullWarning, $handler['type'], $name));
        }

        if (!empty($handler['nested']) && true === $handler['nested']) {
            $this->markNestedHandler($handlerId);
        }

        if (!empty($handler['formatter'])) {
            $definition->addMethodCall('setFormatter', array(new Reference($handler['formatter'])));
        }
        $container->setDefinition($handlerId, $definition);

        return $handlerId;
    }

    private function markNestedHandler($nestedHandlerId)
    {
        if (in_array($nestedHandlerId, $this->nestedHandlers)) {
            return;
        }

        $this->nestedHandlers[] = $nestedHandlerId;
    }

    private function getHandlerId($name)
    {
        return sprintf('monolog.handler.%s', $name);
    }

    private function getHandlerClassByType($handlerType)
    {
        $typeToClassMapping = array(
            'stream' => 'Monolog\Handler\StreamHandler',
            'console' => 'Symfony\Bridge\Monolog\Handler\ConsoleHandler',
            'group' => 'Monolog\Handler\GroupHandler',
            'buffer' => 'Monolog\Handler\BufferHandler',
            'deduplication' => 'Monolog\Handler\DeduplicationHandler',
            'rotating_file' => 'Monolog\Handler\RotatingFileHandler',
            'syslog' => 'Monolog\Handler\SyslogHandler',
            'syslogudp' => 'Monolog\Handler\SyslogUdpHandler',
            'null' => 'Monolog\Handler\NullHandler',
            'test' => 'Monolog\Handler\TestHandler',
            'gelf' => 'Monolog\Handler\GelfHandler',
            'rollbar' => 'Monolog\Handler\RollbarHandler',
            'flowdock' => 'Monolog\Handler\FlowdockHandler',
            'browser_console' => 'Monolog\Handler\BrowserConsoleHandler',
            'firephp' => 'Symfony\Bridge\Monolog\Handler\FirePHPHandler',
            'chromephp' => 'Symfony\Bridge\Monolog\Handler\ChromePhpHandler',
            'debug' => 'Symfony\Bridge\Monolog\Handler\DebugHandler',
            'swift_mailer' => 'Symfony\Bridge\Monolog\Handler\SwiftMailerHandler',
            'native_mailer' => 'Monolog\Handler\NativeMailerHandler',
            'socket' => 'Monolog\Handler\SocketHandler',
            'pushover' => 'Monolog\Handler\PushoverHandler',
            'raven' => 'Monolog\Handler\RavenHandler',
            'newrelic' => 'Monolog\Handler\NewRelicHandler',
            'hipchat' => 'Monolog\Handler\HipChatHandler',
            'slack' => 'Monolog\Handler\SlackHandler',
            'slackwebhook' => 'Monolog\Handler\SlackWebhookHandler',
            'slackbot' => 'Monolog\Handler\SlackbotHandler',
            'cube' => 'Monolog\Handler\CubeHandler',
            'amqp' => 'Monolog\Handler\AmqpHandler',
            'error_log' => 'Monolog\Handler\ErrorLogHandler',
            'loggly' => 'Monolog\Handler\LogglyHandler',
            'logentries' => 'Monolog\Handler\LogEntriesHandler',
            'whatfailuregroup' => 'Monolog\Handler\WhatFailureGroupHandler',
            'fingers_crossed' => 'Monolog\Handler\FingersCrossedHandler',
            'filter' => 'Monolog\Handler\FilterHandler',
            'mongo' => 'Monolog\Handler\MongoDBHandler',
            'elasticsearch' => 'Monolog\Handler\ElasticSearchHandler',
            'server_log' => 'Symfony\Bridge\Monolog\Handler\ServerLogHandler',
        );

        if (!isset($typeToClassMapping[$handlerType])) {
            throw new \InvalidArgumentException(sprintf('There is no handler class defined for handler "%s".', $handlerType));
        }

        return $typeToClassMapping[$handlerType];
    }
}