Class: Invoker::Daemon

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

Overview

rip off from borg github.com/code-mancers/borg/blob/master/lib/borg/borg_daemon.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Daemon

Returns a new instance of Daemon.



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# File 'lib/invoker/daemon.rb', line 7

def initialize
  @process_name = 'invoker'
end

Instance Attribute Details

#process_name ⇒ Object (readonly)

Returns the value of attribute process_name.



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# File 'lib/invoker/daemon.rb', line 5

def process_name
  @process_name
end

Instance Method Details

#daemonize ⇒ Object 



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# File 'lib/invoker/daemon.rb', line 38

def daemonize
  if fork
    sleep(2)
    exit(0)
  else
    Process.setsid
    File.open(pid_file, "w") do |file|
      file.write(Process.pid.to_s)
    end
    Invoker::Logger.puts "Invoker daemon log is available at #{log_file}"
    redirect_io(log_file)
    $0 = process_name
  end
end

#dead? ⇒ Boolean

pidfile exists but process isn’t running

Returns:

  • (Boolean) 


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# File 'lib/invoker/daemon.rb', line 80

def dead?
  status == 1
end

#kill_process ⇒ Object 



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# File 'lib/invoker/daemon.rb', line 53

def kill_process
  pgid =  Process.getpgid(pid)
  Process.kill('-TERM', pgid)
  File.delete(pid_file) if File.exist?(pid_file)
  Invoker::Logger.puts "Stopped Invoker daemon"
end

#log_file ⇒ Object 



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# File 'lib/invoker/daemon.rb', line 34

def log_file
  File.join(Invoker.home, ".invoker", "#{process_name}.log")
end

#pid ⇒ Object 



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# File 'lib/invoker/daemon.rb', line 30

def pid
  File.read(pid_file).strip.to_i
end

#pid_file ⇒ Object 



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# File 'lib/invoker/daemon.rb', line 26

def pid_file
  File.join(Invoker.home, ".invoker", "#{process_name}.pid")
end

#pidfile_exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/invoker/daemon.rb', line 71

def pidfile_exists?
  File.exist?(pid_file)
end

#process_running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/invoker/daemon.rb', line 60

def process_running?
  Process.kill(0, pid)
  true
rescue Errno::ESRCH
  false
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/invoker/daemon.rb', line 75

def running?
  status == 0
end

#start ⇒ Object 



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# File 'lib/invoker/daemon.rb', line 11

def start
  if running?
    Invoker::Logger.puts "Invoker daemon is already running"
    exit(0)
  elsif dead?
    File.delete(pid_file) if File.exist?(pid_file)
  end
  Invoker::Logger.puts "Running Invoker daemon"
  daemonize
end

#status ⇒ Object 



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# File 'lib/invoker/daemon.rb', line 67

def status
  @status ||= check_process_status
end

#stop ⇒ Object 



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# File 'lib/invoker/daemon.rb', line 22

def stop
  kill_process
end