Module: Daemonism

Included in:
Daemonite
Defined in:
lib/daemonite.rb

Constant Summary collapse

DAEMONISM_DEFAULT_OPTS = 
{
  :mode            => :debug,
  :verbose         => false,
  :basepath        => File.expand_path(File.dirname($0)),
  :pidfile         => File.basename($0,'.rb') + '.pid',
  :pidwrite        => true,
  :conffile        => File.basename($0,'.rb') + '.conf',
  :runtime_cmds    => [],
  :runtime_opts    => [],
  :runtime_proc    => nil,
  :cmdl_info       => nil,
  :cmdl_parsing    => true,
  :cmdl_operation  => 'start'
}

Instance Method Summary collapse

Instance Method Details

#at_exit(&blk) ⇒ Object 



148
149
150
 
# File 'lib/daemonite.rb', line 148

def at_exit(&blk)
  @at_exit = blk
end

#daemonism(opts = {}, &block) ⇒ Object 



37
38
39
40
41
42
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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
 
# File 'lib/daemonite.rb', line 37

def daemonism(opts={},&block)
  if File.exists?(opts[:basepath] + '/' + opts[:conffile])
    opts.merge!(Psych::load_file(opts[:basepath] + '/' + opts[:conffile]))
  end
  Dir.chdir(opts[:basepath])

  # set more default options and do other stuff
  opts[:block] = nil
  instance_exec(opts,&block) if block_given?

  ########################################################################################################################
  # parse arguments
  ########################################################################################################################
  if opts[:cmdl_parsing]
    opts[:cmdl_operation] = "start"
    ARGV.options { |opt|
      opt.summary_indent = ' ' * 4
      opt.banner = "Usage:\n#{opt.summary_indent}ruby #{$PROGRAM_NAME} [options] start|stop|restart|info" + (opts[:runtime_cmds].length > 0 ? '|' : '') + opts[:runtime_cmds].map{|ro| ro[0]}.join('|') + "\n"
      opts[:runtime_opts].each do |ro|
        opt.on(*ro)
      end
      opt.on("--verbose", "-v", "Do not daemonize. Write ouput to console.") { opts[:verbose] = true }
      opt.on("--config=FNAME", "-cFNAME", "Config file location.") { |f,a|
        if File.exists?(opts[:basepath] + '/' + f)
          opts.merge!(Psych::load_file(opts[:basepath] + '/' + f))
        end
      }
      opt.on("--help", "-h", "This text.") { puts opt; exit }
      opt.separator(opt.summary_indent + "start|stop|restart|info".ljust(opt.summary_width+1) + "Do operation start, stop, restart or get information.")
      opts[:runtime_cmds].each do |ro|
        opt.separator(opt.summary_indent + ro[0].ljust(opt.summary_width+1) + ro[1])
      end
      opt.parse!
    }
    unless (%w{start stop restart info} + opts[:runtime_cmds].map{|ro| ro[0] }).include?(ARGV[0])
      puts ARGV.options
      exit
    end
    opts[:cmdl_operation] = ARGV[0]
    @at_exit = nil
  end
  ########################################################################################################################
  opts[:runtime_proc].call(opts) unless opts[:runtime_proc].nil?

  ########################################################################################################################
  # status and info
  ########################################################################################################################
  pid = File.read(opts[:basepath] + '/' + opts[:pidfile]).to_i rescue pid = -1
  status = Proc.new do
    begin
      Process.getpgid pid
      true
    rescue Errno::ESRCH
      false
    end
  end
  if opts[:cmdl_operation] == "info" && status.call == false
    puts "Server #{opts[:cmdl_info].nil? ? '' : '(' + opts[:cmdl_info].to_s + ') '}not running"
    exit
  end
  if opts[:cmdl_operation] == "info" && status.call == true
    puts "Server #{opts[:cmdl_info].nil? ? '' : '(' + opts[:cmdl_info].to_s + ') '}running as #{pid}"
    begin
      stats = `ps -o "vsz,rss,lstart,time" -p #{pid}`.split("\n")[1].strip.split(/ +/)
      puts "Virtual:  #{"%0.2f" % (stats[0].to_f/1024)} MiB"
      puts "Resident: #{"%0.2f" % (stats[1].to_f/1024)} MiB"
      puts "Started:  #{stats[2..-2].join(' ')}"
      puts "CPU Time: #{stats.last}"
    rescue
    end
    exit
  end
  if %w{start}.include?(opts[:cmdl_operation]) && status.call == true
    puts "Server #{opts[:cmdl_info].nil? ? '' : '(' + opts[:cmdl_info].to_s + ') '}already started"
    exit
  end

  ########################################################################################################################
  # stop/restart server
  ########################################################################################################################
  if %w{stop restart}.include?(opts[:cmdl_operation])
    if status.call == false
      puts "Server #{opts[:cmdl_info].nil? ? '' : '(' + opts[:cmdl_info].to_s + ') '}maybe not started?"
    else
      puts "Server #{opts[:cmdl_info].nil? ? '' : '(' + opts[:cmdl_info].to_s + ') '}stopped"
      puts "Waiting while server goes down ..."
      while status.call
        Process.kill "SIGTERM", pid
        sleep 0.3
      end
    end
    exit unless opts[:cmdl_operation] == "restart"
  end

  ########################################################################################################################
  # go through user defined startup thingis
  ########################################################################################################################
  opts[:runtime_cmds].each do |ro|
    ro[2].call(status.call) if opts[:cmdl_operation] == ro[0]
  end

  puts "Server #{opts[:cmdl_info].nil? ? '' : '(' + opts[:cmdl_info].to_s + ') '}started as PID:#{Process.pid}"
  Process.daemon(opts[:basepath]) unless opts[:verbose]
  File.write(opts[:basepath] + '/' + opts[:pidfile],Process.pid) # after daemon, so that we get the forked pid
  Dir.chdir(opts[:basepath])
  ::Kernel::at_exit do
    File.unlink(opts[:basepath] + '/' + opts[:pidfile])
    @at_exit.call if @at_exit
  end
end