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 



3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
# 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 '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 



43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
 
# File 'lib/workhorse/daemon/shell_handler.rb', line 43

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

    Options:

      start
        Start the daemon

      stop
        Stop 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