Class: Puppet::Daemon Private

Inherits:
Object show all
Defined in:
lib/puppet/daemon.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Run periodic actions in a daemonized process.

A Daemon has 2 parts:

* config reparse
* an agent that responds to #run

The config reparse will occur periodically based on Settings. The agent is run periodically and a time interval based on Settings. The config reparse will update this time interval when needed.

The Daemon is also responsible for signal handling, starting, stopping, running the agent on demand, and reloading the entire process. It ensures that only one Daemon is running by using a lockfile.

API:

  • private

Constant Summary collapse

SIGNAL_CHECK_INTERVAL =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

API:

  • private

5

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(agent, pidfile, scheduler = Puppet::Scheduler::Scheduler.new()) ⇒ Daemon

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Daemon.

Raises:

API:

  • private



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# File 'lib/puppet/daemon.rb', line 27

def initialize(agent, pidfile, scheduler = Puppet::Scheduler::Scheduler.new())
  raise Puppet::DevError, _("Daemons must have an agent") unless agent

  @scheduler = scheduler
  @pidfile = pidfile
  @agent = agent
  @signals = []
end

Instance Attribute Details

#agent ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 25

def agent
  @agent
end

#argv ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 24

def argv
  @argv
end

#signals ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 25

def signals
  @signals
end

Class Method Details

.close_streams ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Close stdin/stdout/stderr so that we can finish our transition into ‘daemon’ mode.

Returns:

  • nil

API:

  • private



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# File 'lib/puppet/daemon.rb', line 61

def self.close_streams
  Puppet.debug("Closing streams for daemon mode")
  begin
    $stdin.reopen "/dev/null"
    $stdout.reopen "/dev/null", "a"
    $stderr.reopen $stdout
    Puppet::Util::Log.reopen
    Puppet.debug("Finished closing streams for daemon mode")
  rescue => detail
    Puppet.err "Could not start #{Puppet.run_mode.name}: #{detail}"
    Puppet::Util.replace_file("/tmp/daemonout", 0o644) do |f|
      f.puts "Could not start #{Puppet.run_mode.name}: #{detail}"
    end
    exit(12)
  end
end

Instance Method Details

#close_streams ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Convenience signature for calling Puppet::Daemon.close_streams

API:

  • private



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# File 'lib/puppet/daemon.rb', line 79

def close_streams
  Puppet::Daemon.close_streams
end

#daemonize ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Put the daemon into the background.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 41

def daemonize
  pid = fork
  if pid
    Process.detach(pid)
    exit(0)
  end

  create_pidfile

  # Get rid of console logging
  Puppet::Util::Log.close(:console)

  Process.setsid
  Dir.chdir("/")

  close_streams
end

#daemonname ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 36

def daemonname
  Puppet.run_mode.name
end

#reexec ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Raises:

API:

  • private



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# File 'lib/puppet/daemon.rb', line 83

def reexec
  raise Puppet::DevError, _("Cannot reexec unless ARGV arguments are set") unless argv

  command = $PROGRAM_NAME + " " + argv.join(" ")
  Puppet.notice "Restarting with '#{command}'"
  stop(:exit => false)
  exec(command)
end

#reload ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 92

def reload
  agent.run({ :splay => false })
rescue Puppet::LockError
  Puppet.notice "Not triggering already-running agent"
end

#reopen_logs ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 103

def reopen_logs
  Puppet::Util::Log.reopen
end

#restart ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 98

def restart
  Puppet::Application.restart!
  reexec
end

#set_signal_traps ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Trap a couple of the main signals. This should probably be handled in a way that anyone else can register callbacks for traps, but, eh.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 109

def set_signal_traps
  [:INT, :TERM].each do |signal|
    Signal.trap(signal) do
      Puppet.notice "Caught #{signal}; exiting"
      stop
    end
  end

  # extended signals not supported under windows
  unless Puppet::Util::Platform.windows?
    signals = { :HUP => :restart, :USR1 => :reload, :USR2 => :reopen_logs }
    signals.each do |signal, method|
      Signal.trap(signal) do
        Puppet.notice "Caught #{signal}; storing #{method}"
        @signals << method
      end
    end
  end
end

#start ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/puppet/daemon.rb', line 140

def start
  create_pidfile
  run_event_loop
end

#stop(args = { :exit => true }) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Stop everything

API:

  • private



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# File 'lib/puppet/daemon.rb', line 130

def stop(args = { :exit => true })
  Puppet::Application.stop!

  remove_pidfile

  Puppet::Util::Log.close_all

  exit if args[:exit]
end