Class: Jah::Prayer

Inherits:
Object
  • Object
show all
Defined in:
lib/jah/prayer.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Prayer

Returns a new instance of Prayer.



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# File 'lib/jah/prayer.rb', line 5

def initialize(config)
  @config = config
  setup
  ping
end

Class Method Details

.watch(options = {}) ⇒ Object 



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# File 'lib/jah/prayer.rb', line 11

def self.watch(options = {})
  
  God.watch do |w|
    w.name              = "jah"
    w.interval          = 1.minute
    w.start             = "jah #{options[:config]}"
    w.start_grace       = 10.seconds
    w.restart_grace     = 10.seconds

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

    w.restart_if do |restart|
      restart.condition(:memory_usage) do |c|
        c.above = 30.megabytes
        c.times = [3, 5]
      end

      restart.condition(:cpu_usage) do |c|
        c.above = 25.percent
        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
end

Instance Method Details

#ping ⇒ Object

ping server to ensure that it is responsive



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# File 'lib/jah/prayer.rb', line 60

def ping
  if god?
    tries = 3
    begin
      @server.ping
    rescue Exception => e
      retry if (tries -= 1) > 1
      raise e, "The server is not available (or you do not have permissions to access it)"
    end
  end
end

#setup ⇒ Object 



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# File 'lib/jah/prayer.rb', line 52

def setup
  DRb.start_service
  @server = DRbObject.new(nil, God::Socket.socket(@config['god_port'])) || nil
rescue => e
  @config[:god] = false
end