Class: Workhorse::Daemon::ShellHandler

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

Class Method Summary collapse

Class Method Details

.run(**options, &block) ⇒ Object 



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# File 'lib/workhorse/daemon/shell_handler.rb', line 3

def self.run(**options, &block)
  unless ARGV.count == 1
    usage
    exit 99
  end

  if Workhorse.lock_shell_commands
    lockfile_path = options.delete(:lockfile) || 'workhorse.lock'
    lockfile = File.open(lockfile_path, 'a')
    lockfile.flock(File::LOCK_EX || File::LOCK_NB)
  else
    lockfile = nil
  end

  daemon = Workhorse::Daemon.new(**options, &block)

  begin
    case ARGV.first
    when 'start'
      status = daemon.start
    when 'stop'
      status = daemon.stop
    when 'kill'
      status = daemon.stop(true)
    when 'status'
      status = daemon.status
    when 'watch'
      status = daemon.watch
    when 'restart'
      status = daemon.restart
    when 'restart-logging'
      status = daemon.restart_logging
    when 'usage'
      usage
      status = 0
    else
      usage
      status = 99
    end
  rescue StandardError => e
    warn "#{e.message}\n#{e.backtrace.join("\n")}"
    status = 99
  ensure
    lockfile&.flock(File::LOCK_UN)
    exit! status
  end
end

.usage ⇒ Object 



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# File 'lib/workhorse/daemon/shell_handler.rb', line 51

def self.usage
  warn <<~USAGE
    Usage: #{$PROGRAM_NAME} start|stop|status|watch|restart|usage

    Options:

      start
        Start the daemon

      stop
        Stop the daemon

      kill
        Kill the daemon

      status
        Query the status of the daemon. Exit with status 1 if any worker is
        not running.

      watch
        Checks the status (running or stopped) and whether it is as
        expected. Starts the daemon if it is expected to run but is not.

      restart
        Shortcut for consecutive 'stop' and 'start'.

      restart-logging
        Re-opens log files, useful e.g. after the log files have been moved or
        removed by log rotation.

      usage
        Show this message

    Exit status:
     0 if OK,
     1 on fatal errors outside of workhorse,
     2 if at least one worker has an unexpected status,
     99 on all other errors.
  USAGE
end