Class: Daemons::Controller

Inherits:
Object
  • Object
show all
Defined in:
lib/daemons/cmdline.rb,
lib/daemons/controller.rb

Constant Summary collapse

COMMANDS = 
%w(start stop restart run zap reload status)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}, argv = []) ⇒ Controller

Returns a new instance of Controller.



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# File 'lib/daemons/controller.rb', line 12

def initialize(options = {}, argv = [])
  @options = options
  @argv = argv

  # Allow an app_name to be specified. If not specified use the
  # basename of the script.
  @app_name = options[:app_name]

  if options[:script]
    @script = File.expand_path(options[:script])

    @app_name ||= File.split(@script)[1]
  end

  @app_name ||= 'unknown_application'

  @command, @controller_part, @app_part = Controller.split_argv(argv)

  # @options[:dir_mode] ||= :script

  @optparse = Optparse.new(self)
end

Instance Attribute Details

#app_name ⇒ Object (readonly)

Returns the value of attribute app_name.



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# File 'lib/daemons/controller.rb', line 4

def app_name
  @app_name
end

#group ⇒ Object (readonly)

Returns the value of attribute group.



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# File 'lib/daemons/controller.rb', line 6

def group
  @group
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/daemons/controller.rb', line 8

def options
  @options
end

Class Method Details

.split_argv(argv) ⇒ Object

Split an argv array. argv is assumed to be in the following format:

['command', 'controller option 1', 'controller option 2', ..., '--', 'app option 1', ...]

command must be one of the commands listed in COMMANDS

Returns: the command as a string, the controller options as an array, the appliation options as an array



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# File 'lib/daemons/controller.rb', line 99

def self.split_argv(argv)
  argv = argv.dup

  command = nil
  controller_part = []
  app_part = []

  if COMMANDS.include? argv[0]
    command = argv.shift
  end

  if i = argv.index('--')
    # Handle the case where no controller options are given, just
    # options after "--" as well (i == 0)
    controller_part = (i == 0 ? [] : argv[0..i - 1])
    app_part = argv[i + 1..-1]
  else
    controller_part = argv[0..-1]
  end

  [command, controller_part, app_part]
end

Instance Method Details

#catch_exceptions(&block) ⇒ Object 



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# File 'lib/daemons/cmdline.rb', line 122

def catch_exceptions(&block)
  begin
    block.call
  rescue CmdException, OptionParser::ParseError => e
    puts "ERROR: #{e}"
    puts
    print_usage
  rescue RuntimeException => e
    puts "ERROR: #{e}"
  end
end

#print_usage ⇒ Object 



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# File 'lib/daemons/cmdline.rb', line 104

def print_usage
  puts <<-USAGE.gsub(/^ {6}/, '')
  Usage: #{@app_name} <command> <options> -- <application options>

  * where <command> is one of:
    start         start an instance of the application
    stop          stop all instances of the application
    restart       stop all instances and restart them afterwards
    reload        send a SIGHUP to all instances of the application
    run           run the application in the foreground (same as start -t)
    zap           set the application to a stopped state
    status        show status (PID) of application instances

  * and where <options> may contain several of the following:
  #{@optparse.usage}
  USAGE
end

#run ⇒ Object 



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# File 'lib/daemons/controller.rb', line 43

def run
  @options.update @optparse.parse(@controller_part).delete_if { |k, v| !v }

  setup_options

  @group = ApplicationGroup.new(@app_name, @options)
  @group.controller_argv = @controller_part
  @group.app_argv = @app_part

  @group.setup

  case @command
    when 'start'
      @group.new_application.start
    when 'run'
      @options[:ontop] ||= true
      @group.new_application.start
    when 'stop'
      @group.stop_all(@options[:no_wait])
    when 'restart'
      unless @group.applications.empty?
        @group.stop_all(@options[:no_wait])
        sleep(1)
        @group.start_all
      else
        $stderr.puts "#{@group.app_name}: warning: no instances running. Starting..."
        @group.new_application.start
      end
    when 'reload'
      @group.reload_all
    when 'zap'
      @group.zap_all
    when 'status'
      unless @group.applications.empty?
        @group.show_status
        exit 3 if not @group.running?   # exit with status 3 to indicate that no apps are running
      else
        $stderr.puts "#{@group.app_name}: no instances running"
        exit 3                          # exit with status 3 to indicate that no apps are running
      end
    when nil
      fail CmdException.new('no command given')
    else
      fail Error.new("command '#{@command}' not implemented")
  end
end

#setup_options ⇒ Object

This function is used to do a final update of the options passed to the application before they are really used.

Note that this function should only update @options and no other variables.



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# File 'lib/daemons/controller.rb', line 40

def setup_options
end