Module: LND::Tool::Daemon

Defined in:
lib/lnd/tool/daemon.rb

Overview

Daemon module for cli

Class Method Summary collapse

Class Method Details

.base_dir ⇒ Pathname

Get base directory path.

Returns:

  • (Pathname) —

    directory path.



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# File 'lib/lnd/tool/daemon.rb', line 14

def base_dir
  Pathname.new(File.expand_path("#{Dir.home}/.lnd-tool"))
end

.db_path ⇒ Pathname

Get database file path.

Returns:

  • (Pathname) —

    database file path.



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# File 'lib/lnd/tool/daemon.rb', line 20

def db_path
  base_dir.join('storage.db')
end

.pid_file? ⇒ Boolean

Check whether pid file exist?

Returns:

  • (Boolean) 


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# File 'lib/lnd/tool/daemon.rb', line 32

def pid_file?
  pid_path.file?
end

.pid_path ⇒ Pathname

Get pid file path.

Returns:

  • (Pathname) —

    pid file path.



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# File 'lib/lnd/tool/daemon.rb', line 26

def pid_path
  base_dir.join('pid')
end

.running? ⇒ Boolean

Check whether daemon running?

Returns:

  • (Boolean) 


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# File 'lib/lnd/tool/daemon.rb', line 38

def running?
  base_dir.exist? && pid_file? && Process.kill(0, pid_path.read.to_i) == 1
rescue Errno::ESRCH
  false
end

.start ⇒ Object

Start block program as daemon.



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# File 'lib/lnd/tool/daemon.rb', line 50

def start
  base_dir.mkdir unless base_dir.exist?
  raise LND::Tool::Error, "process(#{pid_path.read.to_i}) already running." if running?

  Process.daemon(true)
  pid_path.write(Process.pid.to_s)
  yield
ensure
  pid_path.delete if pid_file?
end

.stop ⇒ Object

Stop daemon.



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# File 'lib/lnd/tool/daemon.rb', line 45

def stop
  Process.kill('KILL', pid_path.read.to_i) if running?
end