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.

[View source]

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_commandObject

[View source]

160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
# File 'lib/god/cli/command.rb', line 160

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

#dispatchObject

[View source]

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 signal 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_commandObject

[View source]

204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
# File 'lib/god/cli/command.rb', line 204

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_commandObject

[View source]

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_commandObject

[View source]

110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
# File 'lib/god/cli/command.rb', line 110

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_commandObject

[View source]

133
134
135
136
137
138
139
140
# File 'lib/god/cli/command.rb', line 133

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

#setupObject

[View source]

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("druby://127.0.0.1:0")
  @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

#signal_commandObject

[View source]

87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
# File 'lib/god/cli/command.rb', line 87

def signal_command
  # get the name of the watch/group
  name = @args[1]
  signal = @args[2]
  
  puts "Sending signal '#{signal}' to '#{name}'"
  
  t = Thread.new { loop { sleep(1); STDOUT.print('.'); STDOUT.flush; sleep(1) } }
  
  watches = @server.signal(name, signal)
  
  # 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

#status_commandObject

[View source]

68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
# File 'lib/god/cli/command.rb', line 68

def status_command
  watches = {}
  @server.status.each do |name, status|
    g = status[:group] || ''
    unless watches.has_key?(g)
      watches[g] = {}
    end
    watches[g][name] = status
  end
  watches.keys.sort.each do |group|
    puts "#{group}:" unless group.empty?
    watches[group].keys.sort.each do |name|
      state = watches[group][name][:state]
      print "  " unless group.empty?
      puts "#{name}: #{state}"
    end
  end
end

#terminate_commandObject

[View source]

142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
# File 'lib/god/cli/command.rb', line 142

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