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Digging Deep With ActiveSupport:: Noti cations Wednesday, April 25, 12

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Let’s Talk... • What is ActiveSupport::Noti cations? • Why you should care • How it works • What you can do with it Wednesday, April 25, 12

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The Basics of AS::Noti cations Wednesday, April 25, 12

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• AS::Noti cations provides a simple, exible messaging system for instrumenting • Lots of valuable data is already exposed by Rails’ built-in instrumentation • Provides an easy path for performance monitoring what you care about in your application • Log & track what matters to you! Why you should care Wednesday, April 25, 12

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“What gets measured gets managed” - Peter Drucker Wednesday, April 25, 12

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production != development Wednesday, April 25, 12

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What Happened? Wednesday, April 25, 12

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How It Works • #subscribe - ask to receive instrument data • #instrument - signal event or track data about operation (duration / exceptions) Wednesday, April 25, 12

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#instrument Message Name (what you #subscribe to) Wednesday, April 25, 12

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#instrument Message Name (what you #subscribe to) Extra Arguments (passed as payload to #subscribe) Wednesday, April 25, 12

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#instrument Message Name (what you #subscribe to) Extra Arguments (passed as payload to #subscribe) Wednesday, April 25, 12

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#instrument Message Name (what you #subscribe to) Extra Arguments (passed as payload to #subscribe) Time Objects Wednesday, April 25, 12

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#instrument Message Name (what you #subscribe to) Extra Arguments (passed as payload to #subscribe) Time Objects Unique Message ID Wednesday, April 25, 12

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#instrument Message Name (what you #subscribe to) Extra Arguments (passed as payload to #subscribe) Time Objects Payload Unique Message ID Wednesday, April 25, 12

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#instrument (Block Form) Wednesday, April 25, 12

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#instrument (Block Form) Wednesday, April 25, 12

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#instrument (Block Form) Duration (difference between these) Wednesday, April 25, 12

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#instrument (Exceptions) Wednesday, April 25, 12

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#instrument (Exceptions) Exception Type (as string, not class) Exception Message Wednesday, April 25, 12

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#subscribe Wednesday, April 25, 12

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#subscribe Wednesday, April 25, 12

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#subscribe Wednesday, April 25, 12

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event#parent_of? Wednesday, April 25, 12

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#subscribe (using regular expressions) Wednesday, April 25, 12

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Rails Instrumentation Wednesday, April 25, 12

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Rails Instrumentation Wednesday, April 25, 12

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Rails Instrumentation Namespaced (right to left) Wednesday, April 25, 12

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Performance Monitoring Wednesday, April 25, 12

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Rails Request Time Wednesday, April 25, 12

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Requests by Server Wednesday, April 25, 12

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Slow Requests Wednesday, April 25, 12

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Slowest Req by Server Wednesday, April 25, 12

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Error Count Wednesday, April 25, 12

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SQL Monitoring Wednesday, April 25, 12

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SQL Monitoring Wednesday, April 25, 12

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Queries by Instance Wednesday, April 25, 12

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Queries by Instance Wednesday, April 25, 12

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SELECTs by Model Wednesday, April 25, 12

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Wednesday, April 25, 12

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What to do with instrumented data? Wednesday, April 25, 12

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Custom Logging Wednesday, April 25, 12

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New Relic Tracking Wednesday, April 25, 12

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Librato Metrics / StatsD Wednesday, April 25, 12

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Wednesday, April 25, 12

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KISS metrics Wednesday, April 25, 12

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Save Data For Later Wednesday, April 25, 12

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...and more • Google Analytics events • Camp re / HipChat alerts • Schedule background jobs • Fire web hooks • etc Wednesday, April 25, 12

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Performance Notes • By default Rails calls subscribers in the thread where instrumentation took place • Consider backgrounding slow subscribers • Dispatcher can be replaced by your own queue system (set AS::Noti cations.noti er) Wednesday, April 25, 12

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#unsubscribe Wednesday, April 25, 12

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Power Moves Wednesday, April 25, 12

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Conditional Instrumentation Wednesday, April 25, 12

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Instrument Per User Wednesday, April 25, 12

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Instrument Per User Wednesday, April 25, 12

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Wednesday, April 25, 12

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Bot Up Your Life Wednesday, April 25, 12

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Simplifying Repetitive Instrumentation Wednesday, April 25, 12

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Just Forward It Wednesday, April 25, 12

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Simplifying Repetitive Subscribers Wednesday, April 25, 12

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LogSubscriber Wednesday, April 25, 12

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LogSubscriber Wednesday, April 25, 12

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LogSubscriber Wednesday, April 25, 12

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LogSubscriber Wednesday, April 25, 12

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LogSubscriber Wednesday, April 25, 12

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LogSubscriber Wednesday, April 25, 12

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LogSubscriber Wednesday, April 25, 12

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Use Outside of Rails • activesupport/noti cations can be required by itself, only needs securerandom to work • provides a good abstract interface for instrumentation • activesupport/log_subscriber is a separate library, can be required if needed Wednesday, April 25, 12

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Supporting #instrument in your Gems Wednesday, April 25, 12

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Faraday Instrumentation Custom Event Name Request Environment Passed as Payload Wednesday, April 25, 12

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Excon Instrumentation Allows Custom Instrumentor Custom Event Prefix Wednesday, April 25, 12

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Wednesday, April 25, 12

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Wednesday, April 25, 12

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Wednesday, April 25, 12

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Wednesday, April 25, 12

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Discuss Conventions for AS::Noti cations in Your Team Wednesday, April 25, 12

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In closing... • AS::Noti cations provides a simple message-based system for instrumentation • Use what Rails gives you, create what it doesn’t • Track what you want, track what matters to you! Wednesday, April 25, 12

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Questions? Matt Sanders twitter: @nextmat https://github.com/nextmat Wednesday, April 25, 12