An antiquated god watch for Adhearsion

adhearsion.god

# run with:   rvmsudo god -c /srv/phone/phonzy/current/ahn/config/god/adhearsion.god
# debug with: rvmsudo god quit && rvmsudo god -c /srv/phone/phonzy/current/ahn/config/god/adhearsion.god -D

@deploy_path = '/srv/phone/phonzy'
@shared_path = File.join @deploy_path, 'shared'
@app_path = File.join @deploy_path, 'current', 'ahn'
@log_path = File.join @shared_path, 'log'
@pid_path = File.join @shared_path, 'pids'
@pid_file = File.join @pid_path, 'adhearsion.pid'
@god_env = YAML.load_file("#{@shared_path}/config/god_environment.yml")

def ahnctl_command(action = 'daemon')
  "cd #{@app_path} && bundle exec ahn #{action} . --pid-file=#{@pid_file} >> #{@log_path}/ahnctl_command.log 2>&1"
end

God.watch do |w|
  w.name  = "phonzy-adhearsion"
  w.group = "phonzy"
  w.env   = @god_env['environment']

  w.interval      = 30.seconds
  w.start_grace   = 20.seconds
  w.restart_grace = 20.seconds

  w.dir = @app_path

  w.start   = ahnctl_command 'daemon'
  w.stop    = ahnctl_command :stop
  w.restart = ahnctl_command :restart

  w.pid_file = @pid_file
  w.behavior :clean_pid_file

  w.uid = "phonzy"
  w.gid = "phonzy"

  w.start_if do |start|
    start.condition(:process_running) do |c|
      c.interval = 5.seconds
      c.running = false
    end
  end

  w.restart_if do |restart|
    restart.condition(:memory_usage) do |c|
      c.above = 1.gigabyte
      c.times = [3, 5] # 3 out of 5 intervals
      c.notify = {:contacts => ['support'], :priority => 1, :category => 'adhearsion'}
    end

    restart.condition(:cpu_usage) do |c|
      c.above = 80.percent
      c.times = 5
      c.notify = {:contacts => ['support'], :priority => 1, :category => 'adhearsion'}
    end
  end

  w.lifecycle do |on|
    on.condition(:flapping) do |c|
      c.to_state = [:start, :restart]
      c.times = 5
      c.within = 5.minute
      c.notify = {:contacts => ['support'], :priority => 1, :category => 'adhearsion'}
      c.transition = :unmonitored
      c.retry_in = 10.minutes
      c.retry_times = 5
      c.retry_within = 2.hours
    end

    on.condition(:cpu_usage) do |c|
      c.above = 40.percent
      c.times = 5
      c.notify = {:contacts => ['support'], :priority => 4, :category => 'adhearsion'}
    end

    on.condition(:memory_usage) do |c|
      c.above = 150.megabytes
      c.notify = {:contacts => ['support'], :priority => 4, :category => 'adhearsion'}
    end
  end

  w.transition(:up, :start) do |on|
    on.condition(:process_exits) do |c|
      c.notify = {:contacts => ['support'], :priority => 1, :category => 'adhearsion'}
    end
  end
end