check_jenkins_job_duration.rb

#!/usr/bin/env ruby

require 'optparse'
require 'rubygems'
require 'json'
require 'open-uri'
require 'pp'
require 'nagios'

JENKINS_HOST = 'localhost'
JENKINS_PORT = 8080

def find_latest_build(job)
  url = "http://#{JENKINS_HOST}:#{JENKINS_PORT}/jobs/job/#{job}/lastBuild/api/json?pretty=true"
  open(url) do |file|
    contents = file.read
    doc = JSON.parse(contents)
    doc['duration'] = Time.now.utc.to_i - Time.at(doc["timestamp"]/1000).to_i
    JenkinsJob.new(doc)
  end
rescue OpenURI::HTTPError => e
  JenkinsJob.new(:error=>:not_found)
rescue => e
  JenkinsJob.new(:error=>:unknown)
end

class JenkinsJob
  def initialize(info)
    @info = info
  end

  def error?
    !@info[:error].nil?
  end

  def not_found?
    @info[:error] = :not_found
  end

  def duration
    @info['duration'].to_i if exists?
  end

  def is_building?
    @info['building'] == true
  end

  def exists?
    !@info["id"].nil?
  end

  def name
    @info['fullDisplayName']
  end

  def url
    @info['url']
  end
end

class JenkinsAgePlugin < Nagios::Plugin

  def measure
    find_latest_build($options[:job_name])
  end

  def critical(job)
    job.is_building? && job.duration > $options[:critical]
  end

  def warning(job)
    job.is_building? && job.duration > $options[:warning]
  end

  def msg(job)
    if !job.exists?
      "No job found"
    elsif !job.is_building?
      "No job currently building"
    else
      { :duration=>job.duration,
        :url=>job.url,
        :name=>job.name,
      }.inspect
    end
  end
  alias :ok_msg :msg
  alias :warning_msg :msg
  alias :critical_msg :msg

end

def main
  $options = {}
  OptionParser.new do |opts|
    opts.on("-w THRESHOLD", Integer) do |threshold|
      $options[:warning] = threshold
    end
    opts.on("-c THRESHOLD", Integer) do |threshold|
      $options[:critical] = threshold
    end
    opts.on("-j JOBNAME") do |job_name|
      $options[:job_name] = job_name
    end
  end.parse!
  
  incomplete = [:warning, :critical, :job_name].any? do |option|
    !$options.has_key?(option)
  end

  if incomplete
    puts "#{$0} -w <warning> -c <critical> -j <job_name>"
    exit 3
  else
    JenkinsAgePlugin.new.run!
  end
end

if $0 == __FILE__
  main
end