delayed_job.rb: Capistrano tasks to "properly" start/stop/restart the delayed_job daemon.

delayed_job.rb

#
# NOTICE: The stop/restart tasks won't work properly due to a bug in the daemons gem
# unless you use the ghazel-daemons gem by putting this in your environment.rb file:
# 
#   config.gem "ghazel-daemons", :lib => "daemons"
#   gem "ghazel-daemons"
#   require "daemons"
#
# This will force-load the 'ghazel-daemons' gem and make sure it's used instead of
# the 'daemons' gem. It works even with the 'daemons' gem installed, so you won't
# have any dependency issues with gems that specifically depend upon daemons.
#


after "deploy:start", "dj:start"
after "deploy:stop",  "dj:stop"

before "deploy:update_code", "dj:stop"
after  "deploy:restart",     "dj:restart"

# delayed_job
namespace :dj do
  
  desc "Start delayed_job daemon."
  task :start, :roles => :app do
    run "if [ -d #{current_path} ]; then cd #{current_path} && sudo RAILS_ENV=#{rails_env} script/delayed_job start; fi"
  end
  
  desc "Stop delayed_job daemon."
  task :stop, :roles => :app do
    run "if [ -d #{current_path} ]; then cd #{current_path} && sudo RAILS_ENV=#{rails_env} script/delayed_job stop; fi"
  end

  desc "Restart delayed_job daemon."
  task :restart, :roles => :app do
    run "if [ -d #{current_path} ]; then cd #{current_path} && sudo RAILS_ENV=#{rails_env} script/delayed_job restart; fi"
  end

  desc "Show delayed_job daemon status."
  task :status, :roles => :app do
    run "if [ -d #{current_path} ]; then cd #{current_path} && sudo RAILS_ENV=#{rails_env} script/delayed_job status; fi"
  end

  desc "List the PIDs of all running delayed_job daemons."
  task :pids, :roles => :app do
    run "sudo lsof | grep '#{deploy_to}/shared/log/delayed_job.log' | cut -c 1-21 | uniq | awk '/^ruby/ {if(NR > 0){system(\"echo \" $2)}}'"
  end

  desc "Kill all running delayed_job daemons."
  task :kill, :roles => :app do
    run "sudo lsof | grep '#{deploy_to}/shared/log/delayed_job.log' | cut -c 1-21 | uniq | awk '/^ruby/ {if(NR > 0){system(\"kill -9 \" $2)}}'"
    run "if [-d #{current_path} ]; then cd #{current_path} && sudo RAILS_ENV=#{rails_env} script/delayed_job stop; fi" # removes orphaned pid file(s)
  end
  
end