Logging with Monolog

Tudor Barbu@motanelu || @CodeVoyagers

#phpbcnLighting talk

Not this kind of logging, but I couldn’t find a relevant picture

Logging with Monolog

https://github.com/Seldaek/monolog PHP 5.3+ && PHP ^7.0 PSR-3 compatible widely used – Symfony, Laravel, etc.

$ composer require monolog/monolog

Monolog Channel

Filehandler

SlackHandler

Formatter(s) Formatter(s)

/var/log/my-app/error.log #my-app-production-monitoring

AmqpBrowser ConsoleBufferChrome PHPCouchDBCubeDeduplicationDoctrine CouchDBDynamoDbElasticSearchErrorLogFirePHPFleepHookFlowdockGelfHip Chat-IFTTTLogEntriesLogglyMail

MandrillMongoDBNative MailerNew RelicNullPHPConsolePsrPushoverRavenRedisRollbarRotating FileSamplingSlackSocket StreamSwift MailerSyslogSyslog UdpTest Zend Monitor

Available handlers

Common problems with logs

Today’s quest:

Find the sweet spot of logging, where all the information needed to fix the problem is there, yet there’s not too much information so that the relevant one is easily available.

Finger crossed strategy

$logger = new Logger('my-app');

$streamHandler = new StreamHandler('/var/log/my-app/error.log’);$formatter = new LineFormatter( "[%datetime%-%channel%[%level_name%] %message% %context% %extra%\n”);$formatter->ignoreEmptyContextAndExtra();$streamHandler->setFormatter($formatter);

$b64p = 'aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1kUXc0dzlXZ1hjUQ==';$slackHandler = new SlackHandler($b64p, '#general', 'BugsyBot');

$fcg = new FingersCrossedHandler( [$streamHandler, $slackHandler,], Logger::ERROR);$logger->setHandler($fcg);

// ...

$logger->info('...');$logger->info('...');$logger->warning('...');

$logger->error('...'); // all handlers are triggered

$logger = new Logger('my-app');

$streamHandler = new StreamHandler('/var/log/my-app/error.log’);$formatter = new LineFormatter( "[%datetime%-%channel%[%level_name%] %message% %context% %extra%\n”);$formatter->ignoreEmptyContextAndExtra();$streamHandler->setFormatter($formatter);

$b64p = 'aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1kUXc0dzlXZ1hjUQ==';$slackHandler = new SlackHandler($b64p, '#general', 'BugsyBot');

$fcg = new WhatFailureGroupHandler( [$streamHandler, $slackHandler,]);$logger->setHandler($fcg);

Protect against handler failure

Missed me?

http://www.belkin.com/us/p/P-F7C050/ https://ifttt.com/recipes/227062-turn-on-your-coffee-maker

Making sure the engineer has *all* the needed tools

Monolog IFTTT handler

WeMo powered coffee machine

Really bad bug in prod

Thank you

@motanelutudor.barbu@skyscanner.nethello@tudorbarbu.ninja

@CodeVoyagerswww.codevoyagers.com