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

  lockfile_path = options.delete(:lockfile) || 'workhorse.lock'
  lockfile = File.open(lockfile_path, 'a')
  lockfile.flock(File::LOCK_EX || File::LOCK_NB)

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

  begin
    case ARGV.first
    when 'start'
      exit daemon.start
    when 'stop'
      exit daemon.stop
    when 'kill'
      exit daemon.stop(true)
    when 'status'
      exit daemon.status
    when 'watch'
      exit daemon.watch
    when 'restart'
      exit daemon.restart
    when 'usage'
      usage
      exit 99
    else
      usage
    end

    exit 0
  rescue => e
    warn "#{e.message}\n#{e.backtrace.join("\n")}"
    exit 99
  ensure
    lockfile.flock(File::LOCK_UN)
  end
end

.usage ⇒ Object 



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# File 'lib/workhorse/daemon/shell_handler.rb', line 45

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'.

  usage
Show this message

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