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
  20             Hub.trigger(self)
  21           end
  22         rescue StandardError
  23           raise EventRegistrationFailedError.new
  24         end
  25       end
  26
  27       def deregister
  28         if File.exist?(self.watch.pid_file)
  29           pid = File.read(self.watch.pid_file).strip.to_i
  30           EventHandler.deregister(pid, :proc_exit)
  31         else
  32           LOG.log(self.watch, :error, "#{self.watch.name} could not deregister: no such PID file #{self.watch.pid_file} (#{self.base_name})")
  33         end
  34       end
  35     end
  36
  37   end
  38 end