Class: God::CLI::Command

Inherits:
Object
  • Object
show all
Defined in:
lib/god/cli/command.rb

Instance Method Summary collapse

Constructor Details

#initialize(command, options, args) ⇒ Command

Returns a new instance of Command.



5
6
7
8
9
10
11
 
# File 'lib/god/cli/command.rb', line 5

def initialize(command, options, args)
  @command = command
  @options = options
  @args = args
  
  dispatch
end

Instance Method Details

#check_command ⇒ Object 



126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
 
# File 'lib/god/cli/command.rb', line 126

def check_command
  Thread.new do
    begin
      event_system = God::EventHandler.event_system
      puts "using event system: #{event_system}"
      
      if God::EventHandler.loaded?
        puts "starting event handler"
        God::EventHandler.start
      else
        puts "[fail] event system did not load"
        exit(1)
      end
      
      puts 'forking off new process'
      
      pid = fork do
        loop { sleep(1) }
      end
      
      puts "forked process with pid = #{pid}"
      
      God::EventHandler.register(pid, :proc_exit) do
        puts "[ok] process exit event received"
        exit!(0)
      end
      
      sleep(1)
      
      puts "killing process"
      
      ::Process.kill('KILL', pid)
    rescue => e
      puts e.message
      puts e.backtrace.join("\n")
    end
  end
  
  sleep(2)
  
  puts "[fail] never received process exit event"
  exit(1)
end

#dispatch ⇒ Object 



27
28
29
30
31
32
33
34
35
36
37
38
39
40
 
# File 'lib/god/cli/command.rb', line 27

def dispatch
  if %w{load status log quit terminate}.include?(@command)
    setup
    send("#{@command}_command")
  elsif %w{start stop restart monitor unmonitor remove}.include?(@command)
    setup
    lifecycle_command
  elsif @command == 'check'
    check_command
  else
    puts "Command '#{@command}' is not valid. Run 'god --help' for usage"
    abort
  end
end

#lifecycle_command ⇒ Object 



170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
 
# File 'lib/god/cli/command.rb', line 170

def lifecycle_command
  # get the name of the watch/group
  name = @args[1]
  
  puts "Sending '#{@command}' command"
  
  t = Thread.new { loop { sleep(1); STDOUT.print('.'); STDOUT.flush; sleep(1) } }
  
  # send @command
  watches = @server.control(name, @command)
  
  # output response
  t.kill; STDOUT.puts
  unless watches.empty?
    puts 'The following watches were affected:'
    watches.each do |w|
      puts '  ' + w
    end
  else
    puts 'No matching task or group'
  end
end

#load_command ⇒ Object 



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
 
# File 'lib/god/cli/command.rb', line 42

def load_command
  file = @args[1]
    
  puts "Sending '#{@command}' command"
  puts
  
  unless File.exist?(file)
    abort "File not found: #{file}"
  end
  
  names, errors = *@server.running_load(File.read(file), File.expand_path(file))
  
  # output response
  unless names.empty?
    puts 'The following tasks were affected:'
    names.each do |w|
      puts '  ' + w
    end
  end
  
  unless errors.empty?
    puts errors
    exit(1)
  end
end

#log_command ⇒ Object 



76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
 
# File 'lib/god/cli/command.rb', line 76

def log_command
  begin
    Signal.trap('INT') { exit }
    name = @args[1]
    
    unless name
      puts "You must specify a Task or Group name"
      exit!
    end
    
    t = Time.at(0)
    loop do
      print @server.running_log(name, t)
      t = Time.now
      sleep 1
    end
  rescue God::NoSuchWatchError
    puts "No such watch"
  rescue DRb::DRbConnError
    puts "The server went away"
  end
end

#quit_command ⇒ Object 



99
100
101
102
103
104
105
106
 
# File 'lib/god/cli/command.rb', line 99

def quit_command
  begin
    @server.terminate
    abort 'Could not stop god'
  rescue DRb::DRbConnError
    puts 'Stopped god'
  end
end

#setup ⇒ Object 



13
14
15
16
17
18
19
20
21
22
23
24
25
 
# File 'lib/god/cli/command.rb', line 13

def setup
  # connect to drb unix socket
  DRb.start_service
  @server = DRbObject.new(nil, God::Socket.socket(@options[:port]))
  
  # ping server to ensure that it is responsive
  begin
    @server.ping
  rescue DRb::DRbConnError
    puts "The server is not available (or you do not have permissions to access it)"
    abort
  end
end

#status_command ⇒ Object 



68
69
70
71
72
73
74
 
# File 'lib/god/cli/command.rb', line 68

def status_command
  watches = @server.status
  watches.keys.sort.each do |name|
    state = watches[name][:state]
    puts "#{name}: #{state}"
  end
end

#terminate_command ⇒ Object 



108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
 
# File 'lib/god/cli/command.rb', line 108

def terminate_command
  t = Thread.new { loop { STDOUT.print('.'); STDOUT.flush; sleep(1) } }
  if @server.stop_all
    t.kill; STDOUT.puts
    puts 'Stopped all watches'
  else
    t.kill; STDOUT.puts
    puts 'Could not stop all watches within 10 seconds'
  end
  
  begin
    @server.terminate
    abort 'Could not stop god'
  rescue DRb::DRbConnError
    puts 'Stopped god'
  end
end