Module: DaemonOgre::Daemon

Defined in:
lib/daemon-ogre/daemon.rb

Class Method Summary collapse

Class Method Details

.init ⇒ Object Also known as: new 



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# File 'lib/daemon-ogre/daemon.rb', line 154

def init

  if DARGV.terminate?
    stop
  end

  if DARGV.daemonize?
    start( ::Kernel.fork )
  end

end

.kill ⇒ Object

Try and read the existing pid from the pid file and signal the process. Returns true for a non blocking status.



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# File 'lib/daemon-ogre/daemon.rb', line 34

def kill

  opid  = OPTS.pidfile.to_i
  Process.kill 'HUP', opid.to_i
  true
rescue Errno::ENOENT
  $stdout.puts "#{pidfile} did not exist: Errno::ENOENT"                        if $DEBUG
  true
rescue Errno::ESRCH
  $stdout.puts "The process #{opid} did not exist: Errno::ESRCH"                if $DEBUG
  true
rescue Errno::EPERM
  $stderr.puts "Lack of privileges to manage the process #{opid}: Errno::EPERM" if $DEBUG
  false
rescue ::Exception => e
  $stderr.puts "While signaling the PID, unexpected #{e.class}: #{e}"           if $DEBUG
  false

end

.kill_by_name ⇒ Object 



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# File 'lib/daemon-ogre/daemon.rb', line 108

def kill_by_name

  # name switch
  target_name ||= $0
  $0 = "ruby_tmp_process"


  app_state= false

  start_time= Time.now
  while `ps aux | grep #{target_name}`.split(' ')[1] != ""  || (Time.now - start_time) < 6

    begin

      Process.kill "TERM",`ps aux | grep #{target_name}`.split(' ')[1].to_i

      app_state= true
    rescue Errno::ESRCH
      $stdout.puts "The process #{target_name} did not exist: Errno::ESRCH"                 if $DEBUG
      break
    rescue Errno::EPERM
      $stderr.puts "Lack of privileges to manage the process #{target_name}: Errno::EPERM"  if $DEBUG
      break
    rescue ::Exception => e
      $stderr.puts "While signaling the PID, unexpected #{e.class}: #{e}"                   if $DEBUG
      break
    end

  end


  # name switch back
  begin
    $0 = target_name
  end

  return app_state
end

.redirect ⇒ Object

Send stdout and stderr to log files for the child process



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# File 'lib/daemon-ogre/daemon.rb', line 55

def redirect

  var= 3
  begin

    $stdin.reopen   File.join('','dev','null')
    $stdout.reopen  OPTS.out__path__
    $stderr.reopen  OPTS.err__path__
    $stdout.sync =  $stderr.sync = true

  rescue Errno::ENOENT => ex

    var -= 1
    retry if var > 0
    raise ex.class,ex

  end

end

.start(pid) ⇒ Object

Checks to see if the current process is the child process and if not will update the pid file with the child pid.



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# File 'lib/daemon-ogre/daemon.rb', line 9

def start pid
  unless pid.nil?
    raise "Fork failed" if pid == -1
    OPTS.pidfile= pid
    ::Kernel.exit
  else
    redirect
  end
end

.stop ⇒ Object 



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# File 'lib/daemon-ogre/daemon.rb', line 147

def stop

  self.terminate
  ::Process.exit!

end

.term_kill ⇒ Object 



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# File 'lib/daemon-ogre/daemon.rb', line 75

def term_kill
  unless OPTS.pidfile.nil?

    begin

      STDOUT.puts("PidFile found, processing...")   if $DEBUG
      Process.kill('TERM', OPTS.pidfile.to_i)
      return true

    rescue Exception => ex

      STDOUT.puts "Exception happened on terminating process: #{ex.class}, #{ex}" if $DEBUG
      return false

    end

  end
end

.terminate ⇒ Object 



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# File 'lib/daemon-ogre/daemon.rb', line 94

def terminate

  # kill methods
  app_killed= false
  [:kill,:term_kill,:kill_by_name].each do |method_name|
    app_killed= self.__send__ method_name
    break if app_killed
  end
  OPTS.pidfile= nil

  return app_killed

end

.write(pid) ⇒ Object

Attempts to write the pid of the forked process to the pid file.



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# File 'lib/daemon-ogre/daemon.rb', line 20

def write pid
  OPTS.pid= pid

  File.open pidfile, "a+" do |new_line|
    new_line.write "#{pid}\n"
  end

rescue ::Exception => e
  $stderr.puts "While writing the PID to file, unexpected #{e.class}: #{e}"
  Process.kill "HUP", pid
end