Class: Wait

Inherits:
Command show all
Defined in:
lib/maws/commands/wait.rb

Instance Attribute Summary

Attributes inherited from Command

#connection, #maws

Instance Method Summary collapse

Methods inherited from Command

#add_generic_options, #initialize, #instances, #process_options, #verify_configs

Constructor Details

This class inherits a constructor from Command

Instance Method Details

#add_specific_options(parser) ⇒ Object 



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# File 'lib/maws/commands/wait.rb', line 9

def add_specific_options(parser)
  parser.opt :target_state, "State to wait for", :type => :string
  parser.opt :wait, "Max wait (seconds)", :default => 60
  parser.opt :count, "Minimum number of specified instances that must match the state", :default => 0
  parser.opt :quiet, "Be quiet", :type => :flag, :default => false
  parser.opt :growl, "Growl notify when done", :type => :flag, :default => false
end

#description ⇒ Object 



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# File 'lib/maws/commands/wait.rb', line 5

def description
  "wait - do nothing until specified instances enter specified state, then quite and notify"
end

#run! ⇒ Object 



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# File 'lib/maws/commands/wait.rb', line 23

def run!
  at_exit do
    if @config.command_line.growl
      system("growlnotify -m 'waiting for AWS state #{@config.command_line.target_state} done'")
    end
  end

  state = @config.command_line.target_state
  been_waiting = 0
  wait_for_count = @config.command_line.count == 0 ? instances.specified.count : @config.command_line.count
  wait_for_time = @config.command_line.wait

  info "waiting #{wait_for_time} seconds or until #{wait_for_count} are #{state}..."

  loop do
    trap("INT") { info "...done (interrupted)"; return }
    return if been_waiting >= wait_for_time
    left_to_wait = wait_for_time - been_waiting
    matching_count = instances.specified.with_approximate_status(state).count

    if matching_count >= wait_for_count
      info "...done (#{matching_count}/#{wait_for_count} are #{state})"
      return
    end

    if @config.command_line.quiet
      print "."
      $stdout.flush
    else
      info "#{matching_count}/#{wait_for_count} are #{state} - wait #{left_to_wait} seconds or until #{wait_for_count}/#{wait_for_count} are #{state}..."
    end


    sleep 1
    been_waiting += 1
    @maws.resync_instances
  end
end

#verify_options ⇒ Object 



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# File 'lib/maws/commands/wait.rb', line 17

def verify_options
  super
  state = @config.command_line.target_state
  Trollop::die "Can't wait for blank state" if state.nil? || state.empty?
end