Advantages of using PSR-3 logger. How to use Monolog in Symfony projects sending logs to Graylog. Presented by Mateusz Wadoń

1. PSR-3: logs using
Monolog and Graylog

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About me
UI/UX enthusiast
Mateusz Wadoń
mateusz.wadon@msales.com
Software Developer at msales
@mwadon

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?

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Logs
Record important events
Debug problems with our code
Application flow
Track error messages
History of users activity

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Old way

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PHP standards before 2009…

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PHP standards before 2009…
Dependency Inversion Principle violation
Hard to change logging library
Apps dependent on the logging library

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PSR-3: Logger Interface
http://www.php-fig.org/psr/psr-3/
interface LoggerInterface
{
public function emergency($message, array $context = array());
public function alert($message, array $context = array());
public function critical($message, array $context = array());
public function error($message, array $context = array());
public function warning($message, array $context = array());
public function notice($message, array $context = array());
public function info($message, array $context = array());
public function debug($message, array $context = array());
public function log($level, $message, array $context = array());
}

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PSR-3: Log levels
Alert – immediate action is required
Critical – critical conditions
Emergency – the system is unusable
Error – errors that do not require immediate
attention but should be monitored
Warning – unusual or undesirable
occurrences that are not errors
Notice – normal but significant events
Info – interesting events
Debug – detailed information for debugging purposes

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Monolog
Logging library for PHP
PSR-3-compatible
https://github.com/Seldaek/monolog

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Monolog architecture
https://www.webfactory.de/blog/logging-with-monolog-in-symfony2

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Monolog: Handlers
Log to database (MongoDBHandler, …)
Log to files and syslog (StreamHandler, SyslogHandler, …)
Send alerts and emails (NativeMailerHandler, SlackbotHandler, …)
Log specific servers and networked logging (GelfHandler, AmqpHandler, …)
Logging in development (ChromePHPHandler, …)

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IFTTTHandler

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Monolog: Wrappers (special Handlers)
FilterHandler
FingersCrossedHandler
DeduplicationHandler
GroupHandler
BufferHandler
NullHandler

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Monolog: Formatters
LineFormatter
JsonFormatter
ChromePHPFormatter
GelfMessageFormatter
ElasticaFormatter
MongoDBFormatter

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Monolog: Processors
IntrospectionProcessor
WebProcessor
MemoryUsageProcessor
GitProcessor

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SessionRequestProcessor
/**
* @param array $record
* @return array
*/
public function processRecord(array $record)
{
if (null === $this->sessionId) {…}
if (null === $this->requestId) {…}
$record['extra']['sess_id'] = $this->sessionId;
$record['extra']['req_id'] = $this->requestId;
return $record;
}

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Do you use Frameworks/CMS?
Symfony https://github.com/symfony/monolog-bundle
Slim https://github.com/flynsarmy/Slim-Monolog
Zend2 https://packagist.org/packages/enlitepro/enlite-monolog
Drupal https://www.drupal.org/project/monolog
WordPress https://packagist.org/packages/fancyguy/wordpress-monolog

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msales Logger
msales.logger:
abstract: true
class: MsalesMonitoringBundleLogsLoggerLogger
arguments:
- "@logger"
tags:
- { name: monolog.logger, channel: logger }
/**
* @param $module
* @param $element
* @param $action
*/
public function setup($module, $element = null, $action = null)
{
$this->context = array_merge(
$this->context,
[
'module' => $module,
'element' => $element,
'action' => $action,
]
);
}

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msales Logger
app.logger.invoice_generate:
parent: app.logger
calls:
- [setup, [Microservice, Invoive, Generate]]
app.logger.visit_product:
parent: app.logger
calls:
- [setup, [Microservice, Product, Visit]]
app.logger.buy_product:
parent: app.logger
calls:
- [setup, [Microservice, Product, Buy]]
msales.logger:
abstract: true
class: MsalesMonitoringBundleLogsLoggerLogger
arguments:
- "@logger"
tags:
- { name: monolog.logger, channel: logger }

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Graylog
Open-source log menagement
Collect and Process
Analyze and Search
Drill-Down and Visualise
Alert and Trigger

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?

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Graylog
http://graylog.ocoderfest.msales:8888/

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Thanks
info.pl@msales.com www.msales.com +48 32 630 40 76
follow us @msalestech
follow me @mwadon

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A picture is worth
a thousand words
By the way, we’re hiring!
Who doesn’t, right? :)