Class: Daemons::Controller

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

Constant Summary collapse

COMMANDS = 
[
  'start',
  'stop',
  'restart',
  'run',
  'zap',
  '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 21

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 5

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 7

def group
  @group
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/daemons/controller.rb', line 9

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 113

def Controller.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
   
  return command, controller_part, app_part
end

Instance Method Details

#catch_exceptions(&block) ⇒ Object 



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# File 'lib/daemons/cmdline.rb', line 103

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

#print_usage ⇒ Object 



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# File 'lib/daemons/cmdline.rb', line 88

def print_usage
  puts "Usage: #{@app_name} <command> <options> -- <application options>"
  puts
  puts "* where <command> is one of:"
  puts "  start         start an instance of the application"
  puts "  stop          stop all instances of the application"
  puts "  restart       stop all instances and restart them afterwards"
  puts "  run           start the application and stay on top"
  puts "  zap           set the application to a stopped state"
  puts
  puts "* and where <options> may contain several of the following:"
  
  puts @optparse.usage
end

#run ⇒ Object 



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# File 'lib/daemons/controller.rb', line 54

def run
  @options.update @optparse.parse(@controller_part).delete_if {|k,v| !v}
  
  setup_options()
  
  #pp @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
    when 'restart'
      unless @group.applications.empty?
        @group.stop_all
        sleep 1
        @group.start_all
      else
        puts "Warning: no instances running. Starting..."
        @group.new_application.start
      end
    when 'zap'
      @group.zap_all
    when 'status'
      unless @group.applications.empty?
        @group.show_status
      else
        puts "#{@group.app_name}: no instances running"
      end
    when nil
      raise CmdException.new('no command given')
      #puts "ERROR: No command given"; puts
      
      #print_usage()
      #raise('usage function not implemented')
    else
      raise 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 50

def setup_options
  #@options[:ontop] ||= true
end