Class: GodWatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/heaven/god_watcher.rb

Overview

:nodoc:all

Instance Method Summary collapse

Constructor Details

#initialize(name, options = {}) ⇒ GodWatcher

Returns a new instance of GodWatcher.



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# File 'lib/heaven/god_watcher.rb', line 3

def initialize(name, options = {})
  @name     = name
  @start    = options[:start]
  @stop     = options[:stop]
  @restart  = options[:restart]
  @pid_file = options[:pid_file]
  @log_file = options[:log_file]
  @uid      = options[:uid]
  @gid      = options[:gid]

  @interval = options[:interval] || 15.seconds
  @grace    = options[:grace]     || 15.seconds

  @behaviors     = options[:behaviors] || []

  @max_memory = options[:max_memory] || 250.megabytes
  @max_cpu    = options[:max_cpu]    || 50.percent
  @max_times  = options[:max_times]  || 5

  @check_flapping = options[:check_flapping].nil? ? true : options[:check_flapping]
  @check_memory   = options[:check_memory].nil? ? true : options[:check_memory]
  @check_cpu      = options[:check_cpu].nil? ? true : options[:check_cpu]
  @check_url      = options[:check_url].nil? ? false : options[:check_url]

  @email_notifications   = options[:email_notifications] || false
  @email_from_address    = options[:email_from_address]
  @email_from_name       = options[:email_from_name] || "God"
  @email_delivery_method = options[:email_delivery_method] || :sendmail
  @email_to              = options[:email_to] || []

  @campfire_notifications = options[:campfire_notifications] || false
  @campfire_subdomain     = options[:campfire_subdomain]
  @campfire_token         = options[:campfire_token]
  @campfire_room          = options[:campfire_room]

  @url                    = options[:url]
  @url_timeout            = options[:url_timeout] || 10.seconds
end

Instance Method Details

#enforce(var, msg) ⇒ Object

Raises:



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# File 'lib/heaven/god_watcher.rb', line 166

def enforce(var, msg)
  raise HeavenConfigurationError.new(msg) if var.blank?
end

#set_god_defaults ⇒ Object

Raises:



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# File 'lib/heaven/god_watcher.rb', line 137

def set_god_defaults
  raise HeavenConfigurationError, "You must specify at least one email address" if @email_notifications == true && @to_emails.empty?

  if @email_notifications
    God::Contacts::Email.defaults do |d|
	d.from_email = @email_from_address
	d.from_name =  @email_from_name
	d.delivery_method = @email_delivery_method
    end

    @email_to.each do |email|
	God.contact(:email) do |c|
 c.name     = email
 c.to_email = email
	end
    end
  end

  if @campfire_notifications 
    God::Contacts::Campfire.defaults do |d|
	d.subdomain = @campfire_subdomain
	d.token     = @campfire_token
	d.room      = @campfire_room
	d.ssl       = true
    end
  end
  @god_defaults_set = true
end

#watch ⇒ Object 



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# File 'lib/heaven/god_watcher.rb', line 42

def watch
  set_god_defaults unless @god_defaults_set

  God.watch do |w|
    w.name     = @name
    w.interval = @interval
    w.start    = @start
    w.stop     = @stop
    w.restart  = @restart  if @restart # not mandatory, if we don't specify it god will do a stop and a start
    w.pid_file = @pid_file if @pid_file
    w.log      = @log_file if @log_file
    w.uid      = @uid if @uid
    w.gid      = @gid if @gid

    w.start_grace   = @grace
    w.restart_grace = @grace

    @behaviors.each { |b| w.behavior(b) }

    unless @check_url
	# 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
 end

 # failsafe
 on.condition(:tries) do |c|
   c.times = @max_times
   c.transition = :start
 end
	end

	# start if process is not running
	w.transition(:up, :start) do |on|
 on.condition(:process_exits)
	end
    end
    
    if @check_memory || @check_cpu
	# restart if memory or cpu is too high
	w.transition(:up, :restart) do |on|
 if @check_memory
   on.condition(:memory_usage) do |c|
     c.above    = @max_memory
     c.times    = @max_times
   end
 end

 if @check_cpu 
   on.condition(:cpu_usage) do |c|
     c.above    = @max_cpu
     c.times    = @max_times
   end
 end
	end
    end

    if @check_url
	u = URI.parse(@url)
	w.transition(:up, :restart) do |on|
 on.condition(:http_response_code) do |c|        
   c.host = u.host
   c.port = u.port
   c.path = u.path
   c.code_is_not = 200        
   c.timeout = @url_timeout
   c.times = @max_times
 end    
	end
    end

    if @check_flapping
	w.lifecycle do |check|
 check.condition(:flapping) do |c|
   c.to_state = [:start, :restart]
   c.times    = 5
   c.within   = 5.minutes
   c.transition = :unmonitored
   c.retry_in = 10.minutes
   c.retry_times = 5
   c.retry_within = 2.hours
 end
	end
    end
  end
end