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 5

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 186

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)
      ::Process.waitpid(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 



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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 231

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 



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# 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 



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# File 'lib/god/cli/command.rb', line 135

def log_command
  begin
    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
end

#quit_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 159

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

#setup ⇒ Object 



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# 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_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 112

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_command ⇒ Object 



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# File 'lib/god/cli/command.rb', line 68

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 = state == :up ? 0 : (state == :unmonitored ? 1 : 2) 
    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 168

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 #{@server.terminate_timeout} seconds"
  end
  
  begin
    @server.terminate
    abort 'Could not stop god'
  rescue DRb::DRbConnError
    puts 'Stopped god'
  end
end