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.



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# File 'lib/god/cli/command.rb', line 6

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

  dispatch
end

Instance Method Details

#check_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 215

def check_command
  Thread.new do
    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)
    ::Process.waitpid(pid)
  rescue => e
    puts e.message
    puts e.backtrace.join("\n")
  end

  sleep(2)

  puts '[fail] never received process exit event'
  exit(1)
end

#dispatch ⇒ Object 



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# 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_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 258

def lifecycle_command
  # get the name of the watch/group
  name = @args[1]

  puts "Sending '#{@command}' command"

  t = Thread.new do
    loop do
      sleep(1)
      $stdout.print('.')
      $stdout.flush
      sleep(1)
    end
  end

  # send @command
  watches = @server.control(name, @command)

  # output response
  t.kill
  $stdout.puts
  if watches.empty?
    puts 'No matching task or group'
  else
    puts 'The following watches were affected:'
    watches.each do |w|
      puts "  #{w}"
    end
  end
end

#load_command ⇒ Object 



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

def load_command
  file = @args[1]
  action = @args[2] || 'leave'

  unless ['stop', 'remove', 'leave', ''].include?(action)
    puts "Command '#{@command}' action must be either 'stop', 'remove' or 'leave'"
    exit(1)
  end

  puts "Sending '#{@command}' command with action '#{action}'"
  puts

  abort "File not found: #{file}" unless File.exist?(file)

  affected, errors, removed = *@server.running_load(File.read(file), File.expand_path(file), action)

  # output response
  unless affected.empty?
    puts 'The following tasks were affected:'
    affected.each do |w|
      puts "  #{w}"
    end
  end

  unless removed.empty?
    puts 'The following tasks were removed:'
    removed.each do |w|
      puts "  #{w}"
    end
  end

  return if errors.empty?

  puts errors
  exit(1)
end

#log_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 161

def log_command
  Signal.trap('INT') { exit }
  name = @args[1]

  unless name
    puts 'You must specify a Task or Group name'
    exit!
  end

  puts 'Please wait...'
  t = Time.at(0)
  loop do
    print @server.running_log(name, t)
    t = Time.now
    sleep 0.25
  end
rescue God::NoSuchWatchError
  puts 'No such watch'
rescue DRb::DRbConnError
  puts 'The server went away'
end

#quit_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 183

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

#setup ⇒ Object 



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# File 'lib/god/cli/command.rb', line 14

def setup
  # connect to drb unix socket
  @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_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 130

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 do
    loop do
      sleep(1)
      $stdout.print('.')
      $stdout.flush
      sleep(1)
    end
  end

  watches = @server.signal(name, signal)

  # output response
  t.kill
  $stdout.puts
  if watches.empty?
    puts 'No matching task or group'
  else
    puts 'The following watches were affected:'
    watches.each do |w|
      puts "  #{w}"
    end
  end
end

#status_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 79

def status_command
  exitcode = 0
  statuses = @server.status
  groups = {}
  statuses.each do |name, status|
    g = status[:group] || ''
    groups[g] ||= {}
    groups[g][name] = status
  end

  if (item = @args[1])
    if (single = statuses[item])
      # specified task (0 -> up, 1 -> unmonitored, 2 -> other)
      state = single[:state]
      puts "#{item}: #{state}"
      exitcode = case state
                 when :up
                   0
                 when :unmonitored
                   1
                 else
                   2
                 end
    elsif groups[item]
      # specified group (0 -> up, N -> other)
      puts "#{item}:"
      groups[item].keys.sort.each do |name|
        state = groups[item][name][:state]
        print '  '
        puts "#{name}: #{state}"
        exitcode += 1 unless state == :up
      end
    else
      puts "Task or Group '#{item}' not found."
      exit(1)
    end
  else
    # show all groups and watches
    groups.keys.sort.each do |group|
      puts "#{group}:" unless group.empty?
      groups[group].keys.sort.each do |name|
        state = groups[group][name][:state]
        print '  ' unless group.empty?
        puts "#{name}: #{state}"
      end
    end
  end

  exit(exitcode)
end

#terminate_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 190

def terminate_command
  t = Thread.new do
    loop do
      $stdout.print('.')
      $stdout.flush
      sleep(1)
    end
  end
  stopped = @server.stop_all
  t.kill
  $stdout.puts
  if stopped
    puts 'Stopped all watches'
  else
    puts "Could not stop all watches within #{@server.terminate_timeout} seconds"
  end

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