Run rake task from delayed_job

delayed_rake.rb

##
# Stick an Object in the queue.
# Delayed::Job.enqueue(DelayedRake.new("util:mongrel_init:name"))

require 'rake'
require 'fileutils'

class DelayedRake
  def initialize(task, options = {})
    @task     = task
    @options  = options
  end

  ##
  # Called by Delayed::Job.
  def perform
    FileUtils.cd Rails.root

    @rake = Rake::Application.new
    Rake.application = @rake
    # Load specified task
    task_name = /^([^:]+):.*?/.match(@task)[1]
    Dir[ "./lib/tasks/**/#{task_name}.rake" ].each { |ext| load ext }

    ENV['RAILS_ENV'] = Rails.env
    begin
      Rails.logger.info "Rake Task (#{Rails.env}): \"#{@task}\" #{@options.inspect} }"
      @rake[@task].execute @options
    rescue => e
      Rails.logger.error "[ERROR]: task \"#{@task}\" failed.  #{e}"
    end
  end
end