god-service

#!/bin/bash
#
# god       Startup script for god (http://god.rubyforge.org)
#
# chkconfig: - 85 15
# description: God is an easy to configure, easy to extend monitoring \
#              framework written in Ruby.
#

CONF_DIR=/etc/god
GOD_BIN=$GEM_HOME/bin/god
RUBY_BIN=~/.rvm/bin/ruby
RETVAL=0

# Go no further if config directory is missing.
[ -d "$CONF_DIR" ] || exit 0

case "$1" in
    start)
      # Create pid directory
      $RUBY_BIN $GOD_BIN -c $CONF_DIR/master.conf
      RETVAL=$?
  ;;
    stop)
      $RUBY_BIN $GOD_BIN terminate
      RETVAL=$?
  ;;
    restart)
      $RUBY_BIN $GOD_BIN terminate
      $RUBY_BIN $GOD_BIN -c $CONF_DIR/master.conf
      RETVAL=$?
  ;;
    status)
      $RUBY_BIN $GOD_BIN status
      RETVAL=$?
  ;;
    *)
      echo "Usage: god {start|stop|restart|status}"
      exit 1
  ;;
esac

exit $RETVAL

master.conf

load "[APPLICATION_ROOT]/current/gods/resque-pool-production.god"

resque-pool-production.god

rails_env = ENV['RAILS_ENV'] || 'production'
rails_root = File.expand_path(File.join(File.dirname(__FILE__),'..'))

God.watch do |w|
  w.dir      = "#{rails_root}"
  w.name     = "resque-pool"
  w.group    = 'resque'
  w.interval = 30.seconds
  w.env      = { "RAILS_ENV" => rails_env }
  w.start    = "bundle exec resque-pool -d -o #{rails_root}/log/resque-pool.stdout -e #{rails_root}/log/resque-pool.stderr -p #{rails_root}/tmp/pids/resque-pool.pid"

  w.pid_file = "#{rails_root}/tmp/pids/resque-pool.pid"
  w.behavior(:clean_pid_file)

  # determine the state on startup
  w.transition(:init, { true => :up, false => :start }) do |on|
    on.condition(:process_running) do |c|
      c.running = true
    end
  end

  # determine when process has finished starting
  w.transition([:start, :restart], :up) do |on|
    on.condition(:process_running) do |c|
      c.running = true
      c.interval = 5.seconds
    end

    # failsafe
    on.condition(:tries) do |c|
      c.times = 5
      c.transition = :start
      c.interval = 5.seconds
    end
  end

  # start if process is not running
  w.transition(:up, :start) do |on|
    on.condition(:process_running) do |c|
      c.running = false
    end
  end
end