Class: Smith::Commands::Pop

Inherits:
Smith::CommandBase show all
Defined in:
lib/smith/commands/smithctl/pop.rb

Instance Attribute Summary

Attributes inherited from Smith::CommandBase

#options, #target

Instance Method Summary collapse

Methods inherited from Smith::CommandBase

#banner, #format_help, #initialize, #parse_options

Methods included from Logger

included

Constructor Details

This class inherits a constructor from Smith::CommandBase

Instance Method Details

#execute ⇒ Object 



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# File 'lib/smith/commands/smithctl/pop.rb', line 7

def execute
  pop
end

#pop ⇒ Object 



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# File 'lib/smith/commands/smithctl/pop.rb', line 11

def pop
  case target.size
  when 0
    "No queue specified. Please specify a queue."
  when 1

    queue = target.first

    Messaging::Queue.number_of_messages(queue) do |queue_length|

      # Number of messages on the queue.
      number_to_remove = (options[:number] > queue_length) ? queue_length : options[:number]

      Messaging::Receiver.new(queue, :auto_ack => false, :prefetch => number_to_remove, :passive => true) do |receiver|

        receiver.on_error do |ch,channel_close|
          case channel_close.reply_code
          when 404
            responder.succeed("Queue does not exist: #{queue}")
          else
            responder.succeed("Unknown error: #{channel_close.reply_text}")
          end
        end

        worker = proc do |acc, n, iter|
          receiver.pop do |payload,r|
            if payload
              acc[:result] << print_message(payload) if options[:print]
              acc[:count] += 1

              if n == number_to_remove - 1
                if options[:remove]
                  r.ack(true)
                else
                  r.reject(:requeue => true)
                end
              end
            end
            iter.return(acc)
          end
        end

        finished = proc do |acc|
          logger.debug { "Removing #{acc[:count]} message from #{receiver.queue_name}" }
          responder.succeed(acc[:result].join("\n"))
        end

        EM::Iterator.new(0...number_to_remove).inject({:count => 0, :result => [], :ack => nil}, worker, finished)
      end
    end
  else
    "You can only specify one queue at a time"
  end
end