get_jenkins_console.rb

require 'awesome_print'
require 'faraday'
module Main extend self
  def run jenkins_name=nil, first=nil, last=first
    return usage unless last
    (first..last).each{ |build| get_console_output_for_build jenkins_name, build }
  end

  private

  # Worker Bees
  # -----------
  def get_console_output_for_build jenkins_name, build
    response = connection.get("job/#{jenkins_name}/#{build}/consoleText")
    if response.status == 200
      puts "#{"get ok".green} Saving console text of #{jenkins_name} build #{build} to #{tmp_dir}/#{file_name(jenkins_name, build)}"
      save_to_file response, jenkins_name, build
    else
      $stderr.puts "#{"get error".red} Could not fetch resource from #{"job/#{jenkins_name}/#{build}/consoleText".red}"
    end
  end

  def save_to_file response, jenkins_name, build
    File.open(File.join(tmp_dir, file_name(jenkins_name, build)), "w") do |file|
      file.write(response.body)
    end
  end

  def usage
    $stderr.puts <<-EOS
    usage:
    #{$0.blue} #{"jenkins_name".green} #{"first_build_id".green} [#{"last_build_id".green} ]

    #{"last_build_id".green} defaults to #{"first_build_id".green}

    Searches the console output of all builds from #{"first_build".green} .. #{"last_build".green} and saves them into
    files in your $TMP dir.
    EOS
  end

  # Constants
  # ---------
  def url
    "https://ci.af83.io/"
  end

  # Lazy Values
  # -----------
  def api_token
      @__api_token__ ||= ENV.fetch('JENKINS_API_TOKEN') do
        $stderr.puts "ConfigurtionError".red, "Need to define the env var #{"JENKINS_API_TOKEN".red}"
        raise KeyError, 'JENKINS_API_TOKEN'
      end
    end

  def connection
    @__connection__ ||= Faraday.new(url: url).tap do |conn|
      conn.basic_auth(userid, api_token)
    end
  end

  def file_name jenkins_name, build # !!! idempotent for **all** parameter combinations
    @__file_name__ ||= "console-text_#{jenkins_name}_#{build}"
  end

  def tmp_dir
    @__tmp_dir__ ||= ENV.fetch('TMP').tap do |dir|
      raise RuntimeError, "$TMP = #{dir} but is no directory" unless File.directory? dir
    end
  end

  def userid
    @__userid__ ||= ENV.fetch('JENKINS_USERID', 'robert.dober')
  end
end

Main.run(* ARGV.dup )