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vendor/symfony/monolog-bundle/DependencyInjection/Compiler/AddProcessorsPass.php

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+<?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\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Registers processors in Monolog loggers or handlers.
+ *
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class AddProcessorsPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('monolog.logger')) {
+            return;
+        }
+
+        foreach ($container->findTaggedServiceIds('monolog.processor') as $id => $tags) {
+            foreach ($tags as $tag) {
+                if (!empty($tag['channel']) && !empty($tag['handler'])) {
+                    throw new \InvalidArgumentException(sprintf('you cannot specify both the "handler" and "channel" attributes for the "monolog.processor" tag on service "%s"', $id));
+                }
+
+                if (!empty($tag['handler'])) {
+                    $definition = $container->findDefinition(sprintf('monolog.handler.%s', $tag['handler']));
+                } elseif (!empty($tag['channel'])) {
+                    if ('app' === $tag['channel']) {
+                        $definition = $container->getDefinition('monolog.logger');
+                    } else {
+                        $definition = $container->getDefinition(sprintf('monolog.logger.%s', $tag['channel']));
+                    }
+                } else {
+                    $definition = $container->getDefinition('monolog.logger_prototype');
+                }
+
+                if (!empty($tag['method'])) {
+                    $processor = [new Reference($id), $tag['method']];
+                } else {
+                    // If no method is defined, fallback to use __invoke
+                    $processor = new Reference($id);
+                }
+                $definition->addMethodCall('pushProcessor', [$processor]);
+            }
+        }
+    }
+}

vendor/symfony/monolog-bundle/DependencyInjection/Compiler/AddSwiftMailerTransportPass.php

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+<?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\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Sets the transport for Swiftmailer handlers depending on the existing
+ * container definitions.
+ *
+ * @author Christian Flothmann <christian.flothmann@xabbuh.de>
+ */
+class AddSwiftMailerTransportPass implements CompilerPassInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $handlers = $container->getParameter('monolog.swift_mailer.handlers');
+
+        foreach ($handlers as $id) {
+            $definition = $container->getDefinition($id);
+            $mailerId = (string) $definition->getArgument(0);
+
+            // Try to fetch the transport for a non-default mailer first, then go with the default swiftmailer
+            $possibleServices = [
+                $mailerId.'.transport.real',
+                $mailerId.'.transport',
+                'swiftmailer.transport.real',
+                'swiftmailer.transport',
+            ];
+
+            foreach ($possibleServices as $serviceId) {
+                if ($container->hasAlias($serviceId) || $container->hasDefinition($serviceId)) {
+                    $definition->addMethodCall(
+                        'setTransport',
+                        [new Reference($serviceId)]
+                    );
+
+                    break;
+                }
+            }
+        }
+    }
+}

vendor/symfony/monolog-bundle/DependencyInjection/Compiler/DebugHandlerPass.php

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+<?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\Compiler;
+
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\Definition;
+use Monolog\Logger;
+
+/**
+ * Adds the DebugHandler when the profiler is enabled and kernel.debug is true.
+ *
+ * @author Christophe Coevoet <stof@notk.org>
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * @deprecated since version 2.12, to be removed in 4.0. Use AddDebugLogProcessorPass in FrameworkBundle instead.
+ */
+class DebugHandlerPass implements CompilerPassInterface
+{
+    private $channelPass;
+
+    public function __construct(LoggerChannelPass $channelPass)
+    {
+        @trigger_error('The '.__CLASS__.' class is deprecated since version 2.12 and will be removed in 4.0. Use AddDebugLogProcessorPass in FrameworkBundle instead.', E_USER_DEPRECATED);
+
+        $this->channelPass = $channelPass;
+    }
+
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('profiler')) {
+            return;
+        }
+
+        if (!$container->getParameter('kernel.debug')) {
+            return;
+        }
+
+        $debugHandler = new Definition('Symfony\Bridge\Monolog\Handler\DebugHandler', [Logger::DEBUG, true]);
+        $container->setDefinition('monolog.handler.debug', $debugHandler);
+
+        foreach ($this->channelPass->getChannels() as $channel) {
+            $container
+                ->getDefinition($channel === 'app' ? 'monolog.logger' : 'monolog.logger.'.$channel)
+                ->addMethodCall('pushHandler', [new Reference('monolog.handler.debug')]);
+        }
+    }
+}

vendor/symfony/monolog-bundle/DependencyInjection/Compiler/FixEmptyLoggerPass.php

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+<?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\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Fixes loggers with no handlers (by registering a "null" one).
+ *
+ * Monolog 1.x adds a default handler logging on STDERR when a logger has
+ * no registered handlers. This is NOT what what we want in Symfony, so in such
+ * cases, we add a "null" handler to avoid the issue.
+ *
+ * Note that Monolog 2.x does not register a default handler anymore, so this pass can
+ * be removed when MonologBundle minimum version of Monolog is bumped to 2.0.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @see https://github.com/Seldaek/monolog/commit/ad37b7b2d11f300cbace9f5e84f855d329519e28
+ */
+class FixEmptyLoggerPass implements CompilerPassInterface
+{
+    private $channelPass;
+
+    public function __construct(LoggerChannelPass $channelPass)
+    {
+        $this->channelPass = $channelPass;
+    }
+
+    public function process(ContainerBuilder $container)
+    {
+        $container->register('monolog.handler.null_internal', 'Monolog\Handler\NullHandler');
+        foreach ($this->channelPass->getChannels() as $channel) {
+            $def = $container->getDefinition($channel === 'app' ? 'monolog.logger' : 'monolog.logger.'.$channel);
+            foreach ($def->getMethodCalls() as $method) {
+                if ('pushHandler' === $method[0]) {
+                    continue 2;
+                }
+            }
+
+            $def->addMethodCall('pushHandler', [new Reference('monolog.handler.null_internal')]);
+        }
+    }
+}

vendor/symfony/monolog-bundle/DependencyInjection/Compiler/LoggerChannelPass.php

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+<?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\Compiler;
+
+use Psr\Log\LoggerInterface;
+use Symfony\Component\DependencyInjection\Argument\BoundArgument;
+use Symfony\Component\DependencyInjection\ChildDefinition;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Replaces the default logger by another one with its own channel for tagged services.
+ *
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class LoggerChannelPass implements CompilerPassInterface
+{
+    protected $channels = ['app'];
+
+    /**
+     * {@inheritDoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('monolog.logger')) {
+            return;
+        }
+
+        // create channels necessary for the handlers
+        foreach ($container->findTaggedServiceIds('monolog.logger') as $id => $tags) {
+            foreach ($tags as $tag) {
+                if (empty($tag['channel']) || 'app' === $tag['channel']) {
+                    continue;
+                }
+
+                $resolvedChannel = $container->getParameterBag()->resolveValue($tag['channel']);
+
+                $definition = $container->getDefinition($id);
+                $loggerId = sprintf('monolog.logger.%s', $resolvedChannel);
+                $this->createLogger($resolvedChannel, $loggerId, $container);
+
+                foreach ($definition->getArguments() as $index => $argument) {
+                    if ($argument instanceof Reference && 'logger' === (string) $argument) {
+                        $definition->replaceArgument($index, $this->changeReference($argument, $loggerId));
+                    }
+                }
+
+                $calls = $definition->getMethodCalls();
+                foreach ($calls as $i => $call) {
+                    foreach ($call[1] as $index => $argument) {
+                        if ($argument instanceof Reference && 'logger' === (string) $argument) {
+                            $calls[$i][1][$index] = $this->changeReference($argument, $loggerId);
+                        }
+                    }
+                }
+                $definition->setMethodCalls($calls);
+
+                if (\method_exists($definition, 'getBindings')) {
+                    $binding = new BoundArgument(new Reference($loggerId));
+
+                    // Mark the binding as used already, to avoid reporting it as unused if the service does not use a
+                    // logger injected through the LoggerInterface alias.
+                    $values = $binding->getValues();
+                    $values[2] = true;
+                    $binding->setValues($values);
+
+                    $bindings = $definition->getBindings();
+                    $bindings['Psr\Log\LoggerInterface'] = $binding;
+                    $definition->setBindings($bindings);
+                }
+            }
+        }
+
+        // create additional channels
+        foreach ($container->getParameter('monolog.additional_channels') as $chan) {
+            if ($chan === 'app') {
+                continue;
+            }
+            $loggerId = sprintf('monolog.logger.%s', $chan);
+            $this->createLogger($chan, $loggerId, $container);
+            $container->getDefinition($loggerId)->setPublic(true);
+        }
+        $container->getParameterBag()->remove('monolog.additional_channels');
+
+        // wire handlers to channels
+        $handlersToChannels = $container->getParameter('monolog.handlers_to_channels');
+        foreach ($handlersToChannels as $handler => $channels) {
+            foreach ($this->processChannels($channels) as $channel) {
+                try {
+                    $logger = $container->getDefinition($channel === 'app' ? 'monolog.logger' : 'monolog.logger.'.$channel);
+                } catch (InvalidArgumentException $e) {
+                    $msg = 'Monolog configuration error: The logging channel "'.$channel.'" assigned to the "'.substr($handler, 16).'" handler does not exist.';
+                    throw new \InvalidArgumentException($msg, 0, $e);
+                }
+                $logger->addMethodCall('pushHandler', [new Reference($handler)]);
+            }
+        }
+    }
+
+    /**
+     * @return array
+     */
+    public function getChannels()
+    {
+        return $this->channels;
+    }
+
+    /**
+     * @param array $configuration
+     *
+     * @return array
+     */
+    protected function processChannels($configuration)
+    {
+        if (null === $configuration) {
+            return $this->channels;
+        }
+
+        if ('inclusive' === $configuration['type']) {
+            return $configuration['elements'] ?: $this->channels;
+        }
+
+        return array_diff($this->channels, $configuration['elements']);
+    }
+
+    /**
+     * Create new logger from the monolog.logger_prototype
+     *
+     * @param string $channel
+     * @param string $loggerId
+     * @param ContainerBuilder $container
+     */
+    protected function createLogger($channel, $loggerId, ContainerBuilder $container)
+    {
+        if (!in_array($channel, $this->channels)) {
+            $logger = new ChildDefinition('monolog.logger_prototype');
+            $logger->replaceArgument(0, $channel);
+            $container->setDefinition($loggerId, $logger);
+            $this->channels[] = $channel;
+        }
+
+        // Allows only for Symfony 4.2+
+        if (\method_exists($container, 'registerAliasForArgument')) {
+            $parameterName = $channel . 'Logger';
+
+            $container->registerAliasForArgument($loggerId, LoggerInterface::class, $parameterName);
+        }
+    }
+
+    /**
+     * Creates a copy of a reference and alters the service ID.
+     *
+     * @param Reference $reference
+     * @param string    $serviceId
+     *
+     * @return Reference
+     */
+    private function changeReference(Reference $reference, $serviceId)
+    {
+        if (method_exists($reference, 'isStrict')) {
+            // Stay compatible with Symfony 2
+            return new Reference($serviceId, $reference->getInvalidBehavior(), $reference->isStrict(false));
+        }
+
+        return new Reference($serviceId, $reference->getInvalidBehavior());
+    }
+}

vendor/symfony/monolog-bundle/DependencyInjection/Configuration.php

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+<?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\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
+use Monolog\Logger;
+
+/**
+ * This class contains the configuration information for the bundle
+ *
+ * This information is solely responsible for how the different configuration
+ * sections are normalized, and merged.
+ *
+ * Possible handler types and related configurations (brackets indicate optional params):
+ *
+ * - service:
+ *   - id
+ *
+ * - stream:
+ *   - path: string
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [file_permission]: int|null, defaults to null (0644)
+ *   - [use_locking]: bool, defaults to false
+ *
+ * - console:
+ *   - [verbosity_levels]: level => verbosity configuration
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [console_formater_options]: array
+ *
+ * - firephp:
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - browser_console:
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - gelf:
+ *   - publisher: {id: ...} or {hostname: ..., port: ..., chunk_size: ...}
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - chromephp:
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - rotating_file:
+ *   - path: string
+ *   - [max_files]: files to keep, defaults to zero (infinite)
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [file_permission]: string|null, defaults to null
+ *   - [filename_format]: string, defaults to '{filename}-{date}'
+ *   - [date_format]: string, defaults to 'Y-m-d'
+ *
+ * - mongo:
+ *   - mongo:
+ *      - id: optional if host is given
+ *      - host: database host name, optional if id is given
+ *      - [port]: defaults to 27017
+ *      - [user]: database user name
+ *      - pass: mandatory only if user is present
+ *      - [database]: defaults to monolog
+ *      - [collection]: defaults to logs
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - elasticsearch:
+ *   - elasticsearch:
+ *      - id: optional if host is given
+ *      - host: elastic search host name. Do not prepend with http(s)://
+ *      - [port]: defaults to 9200
+ *   - [index]: index name, defaults to monolog
+ *   - [document_type]: document_type, defaults to logs
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - redis:
+ *   - redis:
+ *      - id: optional if host is given
+ *      - host: 127.0.0.1
+ *      - password: null
+ *      - port: 6379
+ *      - database: 0
+ *      - key_name: monolog_redis
+ *
+ * - predis:
+ *   - redis:
+ *      - id: optional if host is given
+ *      - host: tcp://10.0.0.1:6379
+ *      - key_name: monolog_redis
+ *
+ * - fingers_crossed:
+ *   - handler: the wrapped handler's name
+ *   - [action_level|activation_strategy]: minimum level or service id to activate the handler, defaults to WARNING
+ *   - [excluded_404s]: if set, the strategy will be changed to one that excludes 404s coming from URLs matching any of those patterns
+ *   - [excluded_http_codes]: if set, the strategy will be changed to one that excludes specific HTTP codes (requires Symfony Monolog bridge 4.1+)
+ *   - [buffer_size]: defaults to 0 (unlimited)
+ *   - [stop_buffering]: bool to disable buffering once the handler has been activated, defaults to true
+ *   - [passthru_level]: level name or int value for messages to always flush, disabled by default
+ *   - [bubble]: bool, defaults to true
+ *
+ * - filter:
+ *   - handler: the wrapped handler's name
+ *   - [accepted_levels]: list of levels to accept
+ *   - [min_level]: minimum level to accept (only used if accepted_levels not specified)
+ *   - [max_level]: maximum level to accept (only used if accepted_levels not specified)
+ *   - [bubble]: bool, defaults to true
+ *
+ * - buffer:
+ *   - handler: the wrapped handler's name
+ *   - [buffer_size]: defaults to 0 (unlimited)
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [flush_on_overflow]: bool, defaults to false
+ *
+ * - deduplication:
+ *   - handler: the wrapped handler's name
+ *   - [store]: The file/path where the deduplication log should be kept, defaults to %kernel.cache_dir%/monolog_dedup_*
+ *   - [deduplication_level]: The minimum logging level for log records to be looked at for deduplication purposes, defaults to ERROR
+ *   - [time]: The period (in seconds) during which duplicate entries should be suppressed after a given log is sent through, defaults to 60
+ *   - [bubble]: bool, defaults to true
+ *
+ * - group:
+ *   - members: the wrapped handlers by name
+ *   - [bubble]: bool, defaults to true
+ *
+ * - whatfailuregroup:
+ *   - members: the wrapped handlers by name
+ *   - [bubble]: bool, defaults to true
+ *
+ * - syslog:
+ *   - ident: string
+ *   - [facility]: defaults to 'user', use any of the LOG_* facility constant but without LOG_ prefix, e.g. user for LOG_USER
+ *   - [logopts]: defaults to LOG_PID
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - syslogudp:
+ *   - host: syslogd host name
+ *   - [port]: defaults to 514
+ *   - [facility]: defaults to 'user', use any of the LOG_* facility constant but without LOG_ prefix, e.g. user for LOG_USER
+ *   - [logopts]: defaults to LOG_PID
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [ident]: string, defaults to
+ *
+ * - swift_mailer:
+ *   - from_email: optional if email_prototype is given
+ *   - to_email: optional if email_prototype is given
+ *   - subject: optional if email_prototype is given
+ *   - [email_prototype]: service id of a message, defaults to a default message with the three fields above
+ *   - [content_type]: optional if email_prototype is given, defaults to text/plain
+ *   - [mailer]: mailer service, defaults to mailer
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [lazy]: use service lazy loading, bool, defaults to true
+ *
+ * - native_mailer:
+ *   - from_email: string
+ *   - to_email: string
+ *   - subject: string
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [headers]: optional array containing additional headers: ['Foo: Bar', '...']
+ *
+ * - symfony_mailer:
+ *   - from_email: optional if email_prototype is given
+ *   - to_email: optional if email_prototype is given
+ *   - subject: optional if email_prototype is given
+ *   - [email_prototype]: service id of a message, defaults to a default message with the three fields above
+ *   - [mailer]: mailer service id, defaults to mailer.mailer
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - socket:
+ *   - connection_string: string
+ *   - [timeout]: float
+ *   - [connection_timeout]: float
+ *   - [persistent]: bool
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - pushover:
+ *   - token: pushover api token
+ *   - user: user id or array of ids
+ *   - [title]: optional title for messages, defaults to the server hostname
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [timeout]: float
+ *   - [connection_timeout]: float
+ *
+ * - raven / sentry:
+ *   - dsn: connection string
+ *   - client_id: Raven client custom service id (optional)
+ *   - [release]: release number of the application that will be attached to logs, defaults to null
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [auto_log_stacks]: bool, defaults to false
+ *   - [environment]: string, default to null (no env specified)
+ *
+ * - newrelic:
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [app_name]: new relic app name, default null
+ *
+ * - hipchat:
+ *   - token: hipchat api token
+ *   - room: room id or name
+ *   - [notify]: defaults to false
+ *   - [nickname]: defaults to Monolog
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [use_ssl]: bool, defaults to true
+ *   - [message_format]: text or html, defaults to text
+ *   - [host]: defaults to "api.hipchat.com"
+ *   - [api_version]: defaults to "v1"
+ *   - [timeout]: float
+ *   - [connection_timeout]: float
+ *
+ * - slack:
+ *   - token: slack api token
+ *   - channel: channel name (with starting #)
+ *   - [bot_name]: defaults to Monolog
+ *   - [icon_emoji]: defaults to null
+ *   - [use_attachment]: bool, defaults to true
+ *   - [use_short_attachment]: bool, defaults to false
+ *   - [include_extra]: bool, defaults to false
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [timeout]: float
+ *   - [connection_timeout]: float
+ *
+ * - slackwebhook:
+ *   - webhook_url: slack webhook URL
+ *   - channel: channel name (with starting #)
+ *   - [bot_name]: defaults to Monolog
+ *   - [icon_emoji]: defaults to null
+ *   - [use_attachment]: bool, defaults to true
+ *   - [use_short_attachment]: bool, defaults to false
+ *   - [include_extra]: bool, defaults to false
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - slackbot:
+ *   - team: slack team slug
+ *   - token: slackbot token
+ *   - channel: channel name (with starting #)
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - cube:
+ *   - url: http/udp url to the cube server
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - amqp:
+ *   - exchange: service id of an AMQPExchange
+ *   - [exchange_name]: string, defaults to log
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - error_log:
+ *   - [message_type]: int 0 or 4, defaults to 0
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - null:
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - test:
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - debug:
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - loggly:
+ *   - token: loggly api token
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [tags]: tag names
+ *
+ * - logentries:
+ *   - token: logentries api token
+ *   - [use_ssl]: whether or not SSL encryption should be used, defaults to true
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *   - [timeout]: float
+ *   - [connection_timeout]: float
+ *
+ * - insightops:
+ *   - token: Log token supplied by InsightOps
+ *   - region: Region where InsightOps account is hosted. Could be 'us' or 'eu'. Defaults to 'us'
+ *   - [use_ssl]: whether or not SSL encryption should be used, defaults to true
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - flowdock:
+ *   - token: flowdock api token
+ *   - source: human readable identifier of the application
+ *   - from_email: email address of the message sender
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - rollbar:
+ *   - id: RollbarNotifier service (mandatory if token is not provided)
+ *   - token: rollbar api token (skip if you provide a RollbarNotifier service id)
+ *   - [config]: config values from https://github.com/rollbar/rollbar-php#configuration-reference
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * - server_log:
+ *   - host: server log host. ex: 127.0.0.1:9911
+ *   - [level]: level name or int value, defaults to DEBUG
+ *   - [bubble]: bool, defaults to true
+ *
+ * All handlers can also be marked with `nested: true` to make sure they are never added explicitly to the stack
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class Configuration implements ConfigurationInterface
+{
+    /**
+     * Generates the configuration tree builder.
+     *
+     * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
+     */
+    public function getConfigTreeBuilder()
+    {
+        $treeBuilder = new TreeBuilder('monolog');
+        $rootNode = method_exists(TreeBuilder::class, 'getRootNode') ? $treeBuilder->getRootNode() : $treeBuilder->root('monolog');
+
+        $rootNode
+            ->fixXmlConfig('channel')
+            ->fixXmlConfig('handler')
+            ->children()
+                ->scalarNode('use_microseconds')->defaultTrue()->end()
+                ->arrayNode('channels')
+                    ->canBeUnset()
+                    ->prototype('scalar')->end()
+                ->end()
+                ->arrayNode('handlers')
+                    ->canBeUnset()
+                    ->useAttributeAsKey('name')
+                    ->prototype('array')
+                        ->fixXmlConfig('member')
+                        ->fixXmlConfig('excluded_404')
+                        ->fixXmlConfig('excluded_http_code')
+                        ->fixXmlConfig('tag')
+                        ->fixXmlConfig('accepted_level')
+                        ->fixXmlConfig('header')
+                        ->canBeUnset()
+                        ->children()
+                            ->scalarNode('type')
+                                ->isRequired()
+                                ->treatNullLike('null')
+                                ->beforeNormalization()
+                                    ->always()
+                                    ->then(function ($v) { return strtolower($v); })
+                                ->end()
+                            ->end()
+                            ->scalarNode('id')->end() // service & rollbar
+                            ->scalarNode('priority')->defaultValue(0)->end()
+                            ->scalarNode('level')->defaultValue('DEBUG')->end()
+                            ->booleanNode('bubble')->defaultTrue()->end()
+                            ->scalarNode('app_name')->defaultNull()->end()
+                            ->booleanNode('include_stacktraces')->defaultFalse()->end()
+                            ->booleanNode('process_psr_3_messages')->defaultNull()->end()
+                            ->scalarNode('path')->defaultValue('%kernel.logs_dir%/%kernel.environment%.log')->end() // stream and rotating
+                            ->scalarNode('file_permission')  // stream and rotating
+                                ->defaultNull()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) {
+                                        if (substr($v, 0, 1) === '0') {
+                                            return octdec($v);
+                                        }
+
+                                        return (int) $v;
+                                    })
+                                ->end()
+                            ->end()
+                            ->booleanNode('use_locking')->defaultFalse()->end() // stream
+                            ->scalarNode('filename_format')->defaultValue('{filename}-{date}')->end() //rotating
+                            ->scalarNode('date_format')->defaultValue('Y-m-d')->end() //rotating
+                            ->scalarNode('ident')->defaultFalse()->end() // syslog and syslogudp
+                            ->scalarNode('logopts')->defaultValue(LOG_PID)->end() // syslog
+                            ->scalarNode('facility')->defaultValue('user')->end() // syslog
+                            ->scalarNode('max_files')->defaultValue(0)->end() // rotating
+                            ->scalarNode('action_level')->defaultValue('WARNING')->end() // fingers_crossed
+                            ->scalarNode('activation_strategy')->defaultNull()->end() // fingers_crossed
+                            ->booleanNode('stop_buffering')->defaultTrue()->end()// fingers_crossed
+                            ->scalarNode('passthru_level')->defaultNull()->end() // fingers_crossed
+                            ->arrayNode('excluded_404s') // fingers_crossed
+                                ->canBeUnset()
+                                ->prototype('scalar')->end()
+                            ->end()
+                            ->arrayNode('excluded_http_codes') // fingers_crossed
+                                ->canBeUnset()
+                                ->beforeNormalization()
+                                    ->always(function ($values) {
+                                        return array_map(function ($value) {
+                                            /*
+                                             * Allows YAML:
+                                             *   excluded_http_codes: [403, 404, { 400: ['^/foo', '^/bar'] }]
+                                             *
+                                             * and XML:
+                                             *   <monolog:excluded-http-code code="403">
+                                             *     <monolog:url>^/foo</monolog:url>
+                                             *     <monolog:url>^/bar</monolog:url>
+                                             *   </monolog:excluded-http-code>
+                                             *   <monolog:excluded-http-code code="404" />
+                                             */
+
+                                            if (is_array($value)) {
+                                                return isset($value['code']) ? $value : ['code' => key($value), 'urls' => current($value)];
+                                            }
+
+                                            return ['code' => $value, 'urls' => []];
+                                        }, $values);
+                                    })
+                                ->end()
+                                ->prototype('array')
+                                    ->children()
+                                        ->scalarNode('code')->end()
+                                        ->arrayNode('urls')
+                                            ->prototype('scalar')->end()
+                                        ->end()
+                                    ->end()
+                                ->end()
+                            ->end()
+                            ->arrayNode('accepted_levels') // filter
+                                ->canBeUnset()
+                                ->prototype('scalar')->end()
+                            ->end()
+                            ->scalarNode('min_level')->defaultValue('DEBUG')->end() // filter
+                            ->scalarNode('max_level')->defaultValue('EMERGENCY')->end() //filter
+                            ->scalarNode('buffer_size')->defaultValue(0)->end() // fingers_crossed and buffer
+                            ->booleanNode('flush_on_overflow')->defaultFalse()->end() // buffer
+                            ->scalarNode('handler')->end() // fingers_crossed and buffer
+                            ->scalarNode('url')->end() // cube
+                            ->scalarNode('exchange')->end() // amqp
+                            ->scalarNode('exchange_name')->defaultValue('log')->end() // amqp
+                            ->scalarNode('room')->end() // hipchat
+                            ->scalarNode('message_format')->defaultValue('text')->end() // hipchat
+                            ->scalarNode('api_version')->defaultNull()->end() // hipchat
+                            ->scalarNode('channel')->defaultNull()->end() // slack & slackwebhook & slackbot
+                            ->scalarNode('bot_name')->defaultValue('Monolog')->end() // slack & slackwebhook
+                            ->scalarNode('use_attachment')->defaultTrue()->end() // slack & slackwebhook
+                            ->scalarNode('use_short_attachment')->defaultFalse()->end() // slack & slackwebhook
+                            ->scalarNode('include_extra')->defaultFalse()->end() // slack & slackwebhook
+                            ->scalarNode('icon_emoji')->defaultNull()->end() // slack & slackwebhook
+                            ->scalarNode('webhook_url')->end() // slackwebhook
+                            ->scalarNode('team')->end() // slackbot
+                            ->scalarNode('notify')->defaultFalse()->end() // hipchat
+                            ->scalarNode('nickname')->defaultValue('Monolog')->end() // hipchat
+                            ->scalarNode('token')->end() // pushover & hipchat & loggly & logentries & flowdock & rollbar & slack & slackbot & insightops
+                            ->scalarNode('region')->end() // insightops
+                            ->scalarNode('source')->end() // flowdock
+                            ->booleanNode('use_ssl')->defaultTrue()->end() // logentries & hipchat & insightops
+                            ->variableNode('user') // pushover
+                                ->validate()
+                                    ->ifTrue(function ($v) {
+                                        return !is_string($v) && !is_array($v);
+                                    })
+                                    ->thenInvalid('User must be a string or an array.')
+                                ->end()
+                            ->end()
+                            ->scalarNode('title')->defaultNull()->end() // pushover
+                            ->scalarNode('host')->defaultNull()->end() // syslogudp & hipchat
+                            ->scalarNode('port')->defaultValue(514)->end() // syslogudp
+                            ->arrayNode('publisher')
+                                ->canBeUnset()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return ['id' => $v]; })
+                                ->end()
+                                ->children()
+                                    ->scalarNode('id')->end()
+                                    ->scalarNode('hostname')->end()
+                                    ->scalarNode('port')->defaultValue(12201)->end()
+                                    ->scalarNode('chunk_size')->defaultValue(1420)->end()
+                                ->end()
+                                ->validate()
+                                    ->ifTrue(function ($v) {
+                                        return !isset($v['id']) && !isset($v['hostname']);
+                                    })
+                                    ->thenInvalid('What must be set is either the hostname or the id.')
+                                ->end()
+                            ->end() // gelf
+                            ->arrayNode('mongo')
+                                ->canBeUnset()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return ['id' => $v]; })
+                                ->end()
+                                ->children()
+                                    ->scalarNode('id')->end()
+                                    ->scalarNode('host')->end()
+                                    ->scalarNode('port')->defaultValue(27017)->end()
+                                    ->scalarNode('user')->end()
+                                    ->scalarNode('pass')->end()
+                                    ->scalarNode('database')->defaultValue('monolog')->end()
+                                    ->scalarNode('collection')->defaultValue('logs')->end()
+                                ->end()
+                                ->validate()
+                                    ->ifTrue(function ($v) {
+                                        return !isset($v['id']) && !isset($v['host']);
+                                    })
+                                    ->thenInvalid('What must be set is either the host or the id.')
+                                ->end()
+                                ->validate()
+                                    ->ifTrue(function ($v) {
+                                        return isset($v['user']) && !isset($v['pass']);
+                                    })
+                                    ->thenInvalid('If you set user, you must provide a password.')
+                                ->end()
+                            ->end() // mongo
+                            ->arrayNode('elasticsearch')
+                                ->canBeUnset()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return ['id' => $v]; })
+                                ->end()
+                                ->children()
+                                    ->scalarNode('id')->end()
+                                    ->scalarNode('host')->end()
+                                    ->scalarNode('port')->defaultValue(9200)->end()
+                                    ->scalarNode('transport')->defaultValue('Http')->end()
+                                    ->scalarNode('user')->defaultNull()->end()
+                                    ->scalarNode('password')->defaultNull()->end()
+                                ->end()
+                                ->validate()
+                                    ->ifTrue(function ($v) {
+                                        return !isset($v['id']) && !isset($v['host']);
+                                    })
+                                    ->thenInvalid('What must be set is either the host or the id.')
+                                ->end()
+                            ->end() // elasticsearch
+                            ->scalarNode('index')->defaultValue('monolog')->end() // elasticsearch
+                            ->scalarNode('document_type')->defaultValue('logs')->end() // elasticsearch
+                            ->scalarNode('ignore_error')->defaultValue(false)->end() // elasticsearch
+                            ->arrayNode('redis')
+                                ->canBeUnset()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return ['id' => $v]; })
+                                ->end()
+                                ->children()
+                                    ->scalarNode('id')->end()
+                                    ->scalarNode('host')->end()
+                                    ->scalarNode('password')->defaultNull()->end()
+                                    ->scalarNode('port')->defaultValue(6379)->end()
+                                    ->scalarNode('database')->defaultValue(0)->end()
+                                    ->scalarNode('key_name')->defaultValue('monolog_redis')->end()
+                                ->end()
+                                ->validate()
+                                    ->ifTrue(function ($v) {
+                                        return !isset($v['id']) && !isset($v['host']);
+                                    })
+                                    ->thenInvalid('What must be set is either the host or the service id of the Redis client.')
+                                ->end()
+                            ->end() // redis
+                            ->arrayNode('predis')
+                                ->canBeUnset()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return ['id' => $v]; })
+                                ->end()
+                                ->children()
+                                    ->scalarNode('id')->end()
+                                    ->scalarNode('host')->end()
+                                ->end()
+                                ->validate()
+                                    ->ifTrue(function ($v) {
+                                        return !isset($v['id']) && !isset($v['host']);
+                                    })
+                                    ->thenInvalid('What must be set is either the host or the service id of the Predis client.')
+                                ->end()
+                            ->end() // predis
+                            ->arrayNode('config')
+                                ->canBeUnset()
+                                ->prototype('scalar')->end()
+                            ->end() // rollbar
+                            ->arrayNode('members') // group, whatfailuregroup
+                                ->canBeUnset()
+                                ->performNoDeepMerging()
+                                ->prototype('scalar')->end()
+                            ->end()
+                            ->scalarNode('from_email')->end() // swift_mailer, native_mailer, symfony_mailer and flowdock
+                            ->arrayNode('to_email') // swift_mailer, native_mailer and symfony_mailer
+                                ->prototype('scalar')->end()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return [$v]; })
+                                ->end()
+                            ->end()
+                            ->scalarNode('subject')->end() // swift_mailer, native_mailer and symfony_mailer
+                            ->scalarNode('content_type')->defaultNull()->end() // swift_mailer and symfony_mailer
+                            ->arrayNode('headers') // native_mailer
+                                ->canBeUnset()
+                                ->scalarPrototype()->end()
+                            ->end()
+                            ->scalarNode('mailer')->defaultNull()->end() // swift_mailer and symfony_mailer
+                            ->arrayNode('email_prototype') // swift_mailer and symfony_mailer
+                                ->canBeUnset()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return ['id' => $v]; })
+                                ->end()
+                                ->children()
+                                    ->scalarNode('id')->isRequired()->end()
+                                    ->scalarNode('method')->defaultNull()->end()
+                                ->end()
+                            ->end()
+                            ->booleanNode('lazy')->defaultValue(true)->end() // swift_mailer
+                            ->scalarNode('connection_string')->end() // socket_handler
+                            ->scalarNode('timeout')->end() // socket_handler, logentries, pushover, hipchat & slack
+                            ->scalarNode('time')->defaultValue(60)->end() // deduplication
+                            ->scalarNode('deduplication_level')->defaultValue(Logger::ERROR)->end() // deduplication
+                            ->scalarNode('store')->defaultNull()->end() // deduplication
+                            ->scalarNode('connection_timeout')->end() // socket_handler, logentries, pushover, hipchat & slack
+                            ->booleanNode('persistent')->end() // socket_handler
+                            ->scalarNode('dsn')->end() // raven_handler, sentry_handler
+                            ->scalarNode('client_id')->defaultNull()->end() // raven_handler, sentry_handler
+                            ->scalarNode('auto_log_stacks')->defaultFalse()->end() // raven_handler
+                            ->scalarNode('release')->defaultNull()->end() // raven_handler, sentry_handler
+                            ->scalarNode('environment')->defaultNull()->end() // raven_handler, sentry_handler
+                            ->scalarNode('message_type')->defaultValue(0)->end() // error_log
+                            ->arrayNode('tags') // loggly
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return explode(',', $v); })
+                                ->end()
+                                ->beforeNormalization()
+                                    ->ifArray()
+                                    ->then(function ($v) { return array_filter(array_map('trim', $v)); })
+                                ->end()
+                                ->prototype('scalar')->end()
+                            ->end()
+                             // console
+                            ->variableNode('console_formater_options')
+                                ->defaultValue([])
+                                ->validate()
+                                    ->ifTrue(function ($v) {
+                                        return !is_array($v);
+                                    })
+                                    ->thenInvalid('console_formater_options must an array.')
+                                ->end()
+                            ->end()
+                            ->arrayNode('verbosity_levels') // console
+                                ->beforeNormalization()
+                                    ->ifArray()
+                                    ->then(function ($v) {
+                                        $map = [];
+                                        $verbosities = ['VERBOSITY_QUIET', 'VERBOSITY_NORMAL', 'VERBOSITY_VERBOSE', 'VERBOSITY_VERY_VERBOSE', 'VERBOSITY_DEBUG'];
+                                        // allow numeric indexed array with ascendning verbosity and lowercase names of the constants
+                                        foreach ($v as $verbosity => $level) {
+                                            if (is_int($verbosity) && isset($verbosities[$verbosity])) {
+                                                $map[$verbosities[$verbosity]] = strtoupper($level);
+                                            } else {
+                                                $map[strtoupper($verbosity)] = strtoupper($level);
+                                            }
+                                        }
+
+                                        return $map;
+                                    })
+                                ->end()
+                                ->children()
+                                    ->scalarNode('VERBOSITY_QUIET')->defaultValue('ERROR')->end()
+                                    ->scalarNode('VERBOSITY_NORMAL')->defaultValue('WARNING')->end()
+                                    ->scalarNode('VERBOSITY_VERBOSE')->defaultValue('NOTICE')->end()
+                                    ->scalarNode('VERBOSITY_VERY_VERBOSE')->defaultValue('INFO')->end()
+                                    ->scalarNode('VERBOSITY_DEBUG')->defaultValue('DEBUG')->end()
+                                ->end()
+                                ->validate()
+                                    ->always(function ($v) {
+                                        $map = [];
+                                        foreach ($v as $verbosity => $level) {
+                                            $verbosityConstant = 'Symfony\Component\Console\Output\OutputInterface::'.$verbosity;
+
+                                            if (!defined($verbosityConstant)) {
+                                                throw new InvalidConfigurationException(sprintf(
+                                                    'The configured verbosity "%s" is invalid as it is not defined in Symfony\Component\Console\Output\OutputInterface.',
+                                                     $verbosity
+                                                ));
+                                            }
+                                            if (!is_numeric($level)) {
+                                                $levelConstant = 'Monolog\Logger::'.$level;
+                                                if (!defined($levelConstant)) {
+                                                    throw new InvalidConfigurationException(sprintf(
+                                                        'The configured minimum log level "%s" for verbosity "%s" is invalid as it is not defined in Monolog\Logger.',
+                                                         $level, $verbosity
+                                                    ));
+                                                }
+                                                $level = constant($levelConstant);
+                                            } else {
+                                                $level = (int) $level;
+                                            }
+
+                                            $map[constant($verbosityConstant)] = $level;
+                                        }
+
+                                        return $map;
+                                    })
+                                ->end()
+                            ->end()
+                            ->arrayNode('channels')
+                                ->fixXmlConfig('channel', 'elements')
+                                ->canBeUnset()
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function ($v) { return ['elements' => [$v]]; })
+                                ->end()
+                                ->beforeNormalization()
+                                    ->ifTrue(function ($v) { return is_array($v) && is_numeric(key($v)); })
+                                    ->then(function ($v) { return ['elements' => $v]; })
+                                ->end()
+                                ->validate()
+                                    ->ifTrue(function ($v) { return empty($v); })
+                                    ->thenUnset()
+                                ->end()
+                                ->validate()
+                                    ->always(function ($v) {
+                                        $isExclusive = null;
+                                        if (isset($v['type'])) {
+                                            $isExclusive = 'exclusive' === $v['type'];
+                                        }
+
+                                        $elements = [];
+                                        foreach ($v['elements'] as $element) {
+                                            if (0 === strpos($element, '!')) {
+                                                if (false === $isExclusive) {
+                                                    throw new InvalidConfigurationException('Cannot combine exclusive/inclusive definitions in channels list.');
+                                                }
+                                                $elements[] = substr($element, 1);
+                                                $isExclusive = true;
+                                            } else {
+                                                if (true === $isExclusive) {
+                                                    throw new InvalidConfigurationException('Cannot combine exclusive/inclusive definitions in channels list');
+                                                }
+                                                $elements[] = $element;
+                                                $isExclusive = false;
+                                            }
+                                        }
+
+                                        if (!count($elements)) {
+                                            return null;
+                                        }
+
+                                        return ['type' => $isExclusive ? 'exclusive' : 'inclusive', 'elements' => $elements];
+                                    })
+                                ->end()
+                                ->children()
+                                    ->scalarNode('type')
+                                        ->validate()
+                                            ->ifNotInArray(['inclusive', 'exclusive'])
+                                            ->thenInvalid('The type of channels has to be inclusive or exclusive')
+                                        ->end()
+                                    ->end()
+                                    ->arrayNode('elements')
+                                        ->prototype('scalar')->end()
+                                    ->end()
+                                ->end()
+                            ->end()
+                            ->scalarNode('formatter')->end()
+                            ->booleanNode('nested')->defaultFalse()->end()
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'service' === $v['type'] && !empty($v['formatter']); })
+                            ->thenInvalid('Service handlers can not have a formatter configured in the bundle, you must reconfigure the service itself instead')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return ('fingers_crossed' === $v['type'] || 'buffer' === $v['type'] || 'filter' === $v['type']) && empty($v['handler']); })
+                            ->thenInvalid('The handler has to be specified to use a FingersCrossedHandler or BufferHandler or FilterHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'fingers_crossed' === $v['type'] && !empty($v['excluded_404s']) && !empty($v['activation_strategy']); })
+                            ->thenInvalid('You can not use excluded_404s together with a custom activation_strategy in a FingersCrossedHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'fingers_crossed' === $v['type'] && !empty($v['excluded_http_codes']) && !empty($v['activation_strategy']); })
+                            ->thenInvalid('You can not use excluded_http_codes together with a custom activation_strategy in a FingersCrossedHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'fingers_crossed' === $v['type'] && !empty($v['excluded_http_codes']) && !empty($v['excluded_404s']); })
+                            ->thenInvalid('You can not use excluded_http_codes together with excluded_404s in a FingersCrossedHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'fingers_crossed' !== $v['type'] && (!empty($v['excluded_http_codes']) || !empty($v['excluded_404s'])); })
+                            ->thenInvalid('You can only use excluded_http_codes/excluded_404s with a FingersCrossedHandler definition')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'filter' === $v['type'] && "DEBUG" !== $v['min_level'] && !empty($v['accepted_levels']); })
+                            ->thenInvalid('You can not use min_level together with accepted_levels in a FilterHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'filter' === $v['type'] && "EMERGENCY" !== $v['max_level'] && !empty($v['accepted_levels']); })
+                            ->thenInvalid('You can not use max_level together with accepted_levels in a FilterHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'rollbar' === $v['type'] && !empty($v['id']) && !empty($v['token']); })
+                            ->thenInvalid('You can not use both an id and a token in a RollbarHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'rollbar' === $v['type'] && empty($v['id']) && empty($v['token']); })
+                            ->thenInvalid('The id or the token has to be specified to use a RollbarHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'swift_mailer' === $v['type'] && empty($v['email_prototype']) && (empty($v['from_email']) || empty($v['to_email']) || empty($v['subject'])); })
+                            ->thenInvalid('The sender, recipient and subject or an email prototype have to be specified to use a SwiftMailerHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'native_mailer' === $v['type'] && (empty($v['from_email']) || empty($v['to_email']) || empty($v['subject'])); })
+                            ->thenInvalid('The sender, recipient and subject have to be specified to use a NativeMailerHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'symfony_mailer' === $v['type'] && empty($v['email_prototype']) && (empty($v['from_email']) || empty($v['to_email']) || empty($v['subject'])); })
+                            ->thenInvalid('The sender, recipient and subject or an email prototype have to be specified to use the Symfony MailerHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'service' === $v['type'] && !isset($v['id']); })
+                            ->thenInvalid('The id has to be specified to use a service as handler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'syslogudp' === $v['type'] && !isset($v['host']); })
+                            ->thenInvalid('The host has to be specified to use a syslogudp as handler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'gelf' === $v['type'] && !isset($v['publisher']); })
+                            ->thenInvalid('The publisher has to be specified to use a GelfHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'socket' === $v['type'] && !isset($v['connection_string']); })
+                            ->thenInvalid('The connection_string has to be specified to use a SocketHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'pushover' === $v['type'] && (empty($v['token']) || empty($v['user'])); })
+                            ->thenInvalid('The token and user have to be specified to use a PushoverHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'raven' === $v['type'] && !array_key_exists('dsn', $v) && null === $v['client_id']; })
+                            ->thenInvalid('The DSN has to be specified to use a RavenHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'sentry' === $v['type'] && !array_key_exists('dsn', $v) && null === $v['client_id']; })
+                            ->thenInvalid('The DSN has to be specified to use Sentry\'s handler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'hipchat' === $v['type'] && (empty($v['token']) || empty($v['room'])); })
+                            ->thenInvalid('The token and room have to be specified to use a HipChatHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'hipchat' === $v['type'] && !in_array($v['message_format'], ['text', 'html']); })
+                            ->thenInvalid('The message_format has to be "text" or "html" in a HipChatHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'hipchat' === $v['type'] && null !== $v['api_version'] && !in_array($v['api_version'], ['v1', 'v2'], true); })
+                            ->thenInvalid('The api_version has to be "v1" or "v2" in a HipChatHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'slack' === $v['type'] && (empty($v['token']) || empty($v['channel'])); })
+                            ->thenInvalid('The token and channel have to be specified to use a SlackHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'slackwebhook' === $v['type'] && (empty($v['webhook_url'])); })
+                            ->thenInvalid('The webhook_url have to be specified to use a SlackWebhookHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'slackbot' === $v['type'] && (empty($v['team']) || empty($v['token']) || empty($v['channel'])); })
+                            ->thenInvalid('The team, token and channel have to be specified to use a SlackbotHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'cube' === $v['type'] && empty($v['url']); })
+                            ->thenInvalid('The url has to be specified to use a CubeHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'mongo' === $v['type'] && !isset($v['mongo']); })
+                            ->thenInvalid('The mongo configuration has to be specified to use a MongoHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'amqp' === $v['type'] && empty($v['exchange']); })
+                            ->thenInvalid('The exchange has to be specified to use a AmqpHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'loggly' === $v['type'] && empty($v['token']); })
+                            ->thenInvalid('The token has to be specified to use a LogglyHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'loggly' === $v['type'] && !empty($v['tags']); })
+                            ->then(function ($v) {
+                                $invalidTags = preg_grep('/^[a-z0-9][a-z0-9\.\-_]*$/i', $v['tags'], PREG_GREP_INVERT);
+                                if (!empty($invalidTags)) {
+                                    throw new InvalidConfigurationException(sprintf('The following Loggly tags are invalid: %s.', implode(', ', $invalidTags)));
+                                }
+
+                                return $v;
+                            })
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'logentries' === $v['type'] && empty($v['token']); })
+                            ->thenInvalid('The token has to be specified to use a LogEntriesHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'insightops' === $v['type'] && empty($v['token']); })
+                            ->thenInvalid('The token has to be specified to use a InsightOpsHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'flowdock' === $v['type'] && empty($v['token']); })
+                            ->thenInvalid('The token has to be specified to use a FlowdockHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'flowdock' === $v['type'] && empty($v['from_email']); })
+                            ->thenInvalid('The from_email has to be specified to use a FlowdockHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'flowdock' === $v['type'] && empty($v['source']); })
+                            ->thenInvalid('The source has to be specified to use a FlowdockHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'server_log' === $v['type'] && empty($v['host']); })
+                            ->thenInvalid('The host has to be specified to use a ServerLogHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'redis' === $v['type'] && empty($v['redis']); })
+                            ->thenInvalid('The host has to be specified to use a RedisLogHandler')
+                        ->end()
+                        ->validate()
+                            ->ifTrue(function ($v) { return 'predis' === $v['type'] && empty($v['redis']); })
+                            ->thenInvalid('The host has to be specified to use a RedisLogHandler')
+                        ->end()
+                    ->end()
+                    ->validate()
+                        ->ifTrue(function ($v) { return isset($v['debug']); })
+                        ->thenInvalid('The "debug" name cannot be used as it is reserved for the handler of the profiler')
+                    ->end()
+                    ->example([
+                        'syslog' => [
+                            'type' => 'stream',
+                            'path' => '/var/log/symfony.log',
+                            'level' => 'ERROR',
+                            'bubble' => 'false',
+                            'formatter' => 'my_formatter',
+                        ],
+                        'main' => [
+                            'type' => 'fingers_crossed',
+                            'action_level' => 'WARNING',
+                            'buffer_size' => 30,
+                            'handler' => 'custom',
+                        ],
+                        'custom' => [
+                            'type' => 'service',
+                            'id' => 'my_handler',
+                        ]
+                    ])
+                ->end()
+            ->end()
+        ;
+
+        return $treeBuilder;
+    }
+}