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Ruby PluginsYou’ve come a long way baby

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Charles Lowell• cowboyd@github• cowboyd@twitter• cowboyd@jenkins-ci

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What the hell am I doing here?

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User Interfaces

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Lots of Ruby

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Lot’s of JavaScript

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Lot’s of Java/C++ + therubyracer, therubyrhino

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Bugs!• Ruby versions (1.8.6,1.8.7,1.9.2, rbx, jruby, ...)• CC/libc version• OS (OSX, ubuntu, rhel)

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HELL

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We need a DIESEL CI solution.

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Fun Fact: Weactually designed this logo

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jenkins.rb 0.1• rubygem containing jenkins.war• utility for starting a test jenkins server

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Dr Nic • Saw my lightning talk • went hog wild on the gem

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jenkins.rb 1.0 • create/list/update jobs from CLI • create sinatra/rails jobs in one go • huge arsenal of Jenkins Macros

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Eventually, we wanted more than macros.

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Ruby PluginsExtend Jenkins with nothing but Ruby

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We need a plan

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How ‘bout you do it?We need a plan

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Mad Propers! Kohsuke Kawaguchi

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Ruby Plugins See them in action

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What does it mean fora plugin to be in Ruby?

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Language Ruby. Duh.

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APImust “feel” like Ruby, not just scripting Java.

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Example“Push” vs “Pull” configuration

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Java

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Scripted Java

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Ruby

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ToolsThey’ve gotta be Ruby too.

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-Maven -javac• Rake - build and assembly• Bundler - dependency management• jpi - development tools

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TestingYup, also Ruby

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No solid answers yet• unit testing?• mocking builds, jobs, projects?• fixtures for builds, jobs, projects?

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How it works

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How it works Plugin.java

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Plugin.java Jenkins •Ruby Runtime Plugin Small as can jenkins-ruby-api possibly be Ruby Plugin A bundled gems • plugin ruby code 5 small classes Ruby Plugin B ..... • will not instantiate extension points jenkins-ruby-api Ruby Plugin C bundled gems plugin ruby code

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Plugin.java Jenkins •Ruby Runtime Plugin every plugin gets its own scripting JRuby Ruby Plugin A container Ruby Plugin B ..... • isolation + JRuby backwards Ruby Plugin C compatibility

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How it works Plugin.rb

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Plugin.rb Jenkins •Ruby Runtime Plugin own copy of API JRuby ruby API Ruby Plugin A bundled gems extension points • own copy of gems Ruby Plugin B ..... • Ruby extension JRuby points detected Ruby Plugin C ruby API bundled gems and auto-loaded extension points

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Plugin.rb JenkinsRuby Runtime Plugin JRuby • Library code is free to vary from ruby API 1.1 Ruby Plugin A json 1.5, nokogiri 1.8 extension points plugin to plugin • Ruby Plugin B ..... This includes the plugin API! JRuby ruby API 1.3rc5 Ruby Plugin C json 1.6.4 extension points

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Plugin.rb (API)• Builder - implement build steps• Publisher - run build steps after build complete• BuildWrapper - decorate a build with setup/teardown

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Plugin.rb (API)• All Ruby extension points are Plain old Ruby objects (TM)• Plugin maintains two-way list of proxies to support this

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Plugin.rb (API) Jenkins Ruby Plugin • All Java Objects Java Ruby proxied •hudson.model.AbstractBuild Jenkins::Model::Build All Ruby Objects wrapped • Java Ruby referential hudson.tasks.Builder Jenkins::Tasks::Builder integrity Proxies

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More Fundamental than Ruby

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Supporting Features• Flexible Descriptor registration• Pluggable persistence via JRuby Xstream• Stapler support for pluggable templating

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Supporting FeaturesMore plugin-provided metadata. Less Java reflection.

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What works for Ruby... works for Python

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What works for Ruby... works for Python (in theory)

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What works for Ruby... works for Python (in theory) but not as magnificently :)

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What works for Ruby... works for JavaScript

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What works for Ruby... works for Clojure

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What works for Ruby... works for Fantom

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What works for Ruby... works for X

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400+ Plugins to date

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4,000 plugins

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4,000 plugins sooner than you think?

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Applications?

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Frameworks?

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gem install jenkins-plugin

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Thanks!• cowboyd@github• cowboyd@twitter• cowboyd@jenkins-ci