Class: Smith::Daemon

Inherits:
Object
  • Object
show all
Includes:
Logger
Defined in:
lib/smith/daemon.rb

Instance Method Summary collapse

Methods included from Logger

included

Constructor Details

#initialize(name, daemonise, dir = nil) ⇒ Daemon

Returns a new instance of Daemon.



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# File 'lib/smith/daemon.rb', line 14

def initialize(name, daemonise, dir=nil)
  @name = name
  @daemonise = daemonise
  @pid = Daemons::PidFile.new(pid_directory(dir), @name)
end

Instance Method Details

#daemonise ⇒ Object

Daemonise the process if the daemonise option is true, otherwise do nothing.



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# File 'lib/smith/daemon.rb', line 21

def daemonise
  unlink_pid_file

  if @daemonise
    fork && exit

    unless Process.setsid
      raise RuntimeException, 'cannot detach from controlling terminal'
    end

    $0 = @name

    # Be nice to unmount.
    Dir.chdir "/"

    STDIN.reopen("/dev/null")
    STDOUT.reopen("/dev/null")
    STDERR.reopen(STDOUT)
  end

  $0 = @name

  @pid.pid = Process.pid
  logger.debug { "Pid file: #{@pid.filename}" }
end

#pid ⇒ Object

Return the pid of the process

Returns:

  • the pid or nil if not set.



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# File 'lib/smith/daemon.rb', line 62

def pid
  @pid.pid
end

#running? ⇒ Boolean

Check to see if the program is running. This checks for the existance of a pid file and if there is checks to see if the pid exists.

Returns:

  • (Boolean) 


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# File 'lib/smith/daemon.rb', line 49

def running?
  pid_files = Daemons::PidFile.find_files(@pid.dir, @name)

  if pid_files.empty?
    false
  else
    pid = File.read(pid_files.first).to_i
    pid > 0 && Daemons::Pid.running?(pid) && process_names_match?(@name, pid)
  end
end

#unlink_pid_file ⇒ Object 



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# File 'lib/smith/daemon.rb', line 66

def unlink_pid_file
  p = Pathname.new(@pid.filename)
  if p.exist?
    logger.verbose { "Removing pid file: #{p.to_s}" }
    p.unlink
  end
end