Discourse God file, needs work.

discourse.god

rails_env = 'production'
rails_root = File.dirname(File.dirname(__FILE__)) # Place this file in the config directory
secret_token = 'CHANGE_THIS'

user = 'deployer'
group = 'users'
num_webs = 4

environment = {'RAILS_ENV' => rails_env, 'SECRET_TOKEN' => secret_token, 'RUBY_GC_MALLOC_LIMIT' => 90000000}
config_hash = {:rails_root => rails_root, :user => user, :group => group, :environment => environment}

def generic_monitoring(w, options = {})
  w.start_if do |start|
    start.condition(:process_running) do |c|
      c.interval = 30.seconds
      c.running = false
    end
  end
  
  w.restart_if do |restart|
    restart.condition(:memory_usage) do |c|
      c.above = options[:memory_limit]
      c.times = [3, 5] # 3 out of 5 intervals
    end
  
    restart.condition(:cpu_usage) do |c|
      c.above = options[:cpu_limit]
      c.times = 5
    end
  end
  
  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 generic_settings(w, options = {})
  w.dir = options[:rails_root]
  w.env = options[:environment]
  w.uid = options[:user]
  w.gid = options[:group]
  w.behavior(:clean_pid_file)

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

# Thin servers
num_webs.times do |num|
  God.watch do |w|
    yaml_file = "#{rails_root}/config/thin.yml"
    w.name = "thin-#{num}"
    w.group = 'web'
    w.start = "bundle exec thin start -C #{yaml_file} -o #{num}"
    w.stop = "bundle exec thin stop -C #{yaml_file} -o #{num}"
    w.restart = "bundle exec thin restart -C #{yaml_file} -o #{num}"
    w.pid_file = "#{rails_root}/tmp/pids/thin.#{num}.pid"
    w.log = "#{rails_root}/log/thin.#{num}.log"

    generic_settings(w, config_hash)
    generic_monitoring(w, :cpu_limit => 30.percent, :memory_limit => 275.megabytes)
  end
end

# Sidekiq
God.watch do |w|
  pid_file = "#{rails_root}/tmp/pids/sidekiq.pid"
  w.name     = 'sidekiq'
  w.start = "bundle exec sidekiq -P #{rails_root}/tmp/pids/sidekiq.pid"
  w.stop = "kill -QUIT `cat #{pid_file}`"
  w.pid_file = "#{rails_root}/tmp/pids/sidekiq.pid"
  w.log = "#{rails_root}/log/sidekiq.log"

  generic_settings(w, config_hash)
  generic_monitoring(w, :cpu_limit => 30.percent, :memory_limit => 250.megabytes)
end

# Clockwork
God.watch do |w|
  pid_file = "#{rails_root}/tmp/pids/clockwork.pid"
  w.name     = 'clockwork'
  w.start = "bundle exec clockwork #{rails_root}/config/clock.rb"
  w.stop = "kill -QUIT `cat #{pid_file}`"
  w.pid_file = "#{rails_root}/tmp/pids/clockwork.pid"
  w.log = "#{rails_root}/log/clockwork.log"

  generic_settings(w, config_hash)
  generic_monitoring(w, :cpu_limit => 30.percent, :memory_limit => 200.megabytes)
end