lib/god/conditions/process_exits.rb

   1 module God
   2   module Conditions
   3
   4     class ProcessExits < EventCondition
   5       def initialize
   6         self.info = "process exited"
   7       end
   8
   9       def valid?
  10         valid = true
  11         valid &= complain("Attribute 'pid_file' must be specified", self) if self.watch.pid_file.nil?
  12         valid
  13       end
  14
  15       def register
  16         pid = File.read(self.watch.pid_file).strip.to_i
  17
  18         begin
  19           EventHandler.register(pid, :proc_exit) do |extra|
  20             self.info = "process exited #{extra.inspect}"
  21             Hub.trigger(self)
  22           end
  23         rescue StandardError
  24           raise EventRegistrationFailedError.new
  25         end
  26       end
  27
  28       def deregister
  29         if File.exist?(self.watch.pid_file)
  30           pid = File.read(self.watch.pid_file).strip.to_i
  31           EventHandler.deregister(pid, :proc_exit)
  32         else
  33           applog(self.watch, :error, "#{self.watch.name} could not deregister: no such PID file #{self.watch.pid_file} (#{self.base_name})")
  34         end
  35       end
  36     end
  37
  38   end
  39 end