God server transitions

gistfile1.rb

def life_cycle(w)
  w.lifecycle do |on|
    on.condition(:flapping) do |c|
      c.to_state = [:start, :restart]
      c.times = 5
      c.within = 5.minute
      c.transition = :unmonitored
      c.retry_in = 10.minutes
      c.retry_times = 5
      c.retry_within = 2.hours
    end
  end
end

def server_transitions(w)
  
  w.transition(:start, :up) do |on|
    on.condition(:process_running) do |c|
      c.running = true
    end
  end
  
  w.transition([:start, :restart], :up) do |on|
    on.condition(:process_running) do |c|
      c.running = true
    end
    
    # failsafe
    on.condition(:tries) do |c|
      c.times = 5
      c.transition = :start
    end
  end
  
  # init if process is not running
  w.transition(:up, :init) do |on|
    on.condition(:process_exits)
  end
  life_cycle w
end

# Example Watch
God.watch do |w|
   w.group         = "app_servers"
   w.name          = "app_server"
   w.start         = "#{APP_ROOT}/bin/app_server --log-file #{APP_ROOT}/log/app_server.log"
   w.start_grace   = 5.seconds
   w.restart_grace = 5.seconds
   w.log           = "#{APP_ROOT}/log/app_server.log"
   w.interval      = 30.seconds
      
   w.transition(:init, :start) do |on|
     on.condition(:dependents_running) do |c|
       c.interval = 3.seconds
     end
   end
  
   server_transitions w

end