Module: GrowlAMQP

Defined in:
lib/growl-amqp.rb

Class Method Summary collapse

Class Method Details

.monitor!(given_opts = nil, &block) ⇒ Object

monitor a given AMQP stream the given_opts may contain options for AMQP.start! and also :queue, :exchange, :vhost, :user, :pass, :routing_key, :file, and :ontop.



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# File 'lib/growl-amqp.rb', line 14

def monitor!(given_opts = nil, &block)

  # default options
  opts = {}
  unless given_opts
    opts[:exchange] = 'amq.fanout'
    opts[:queue] = 'amqpgrowl'
  end
  
  parser = OptionParser.new do | o | 
    o.banner = "Usage: #{File.basename($0)} [OPTIONS] <start|stop>"  
    o.banner = "Relay AMQP messages via growl.  Handy for debugging AMQP applications."  
  
    o.on('-q','--queue <queue>','The name of the AMQP queue to subscribe to') do | queue |
      opts[:queue] = queue 
    end
    
    o.on('-e','--exchange <exchange>','The name of the AMQP exchange to bind to.  Can be specified multiple times') do | exch |
      opts[:exchange] = exch
    end
  
    o.on('-k','--key <routing key>','The routing key to bind to (on diret and topic exchanges)') do | key |
      opts[:key] = key
    end
  
    o.on('-v','--vhost <vhost>','The name of the AMQP vhost to connect to') do | vhost |
      opts[:vhost] = vhost
    end
    
    o.on('-r','--remote <host>','The AMQP broker hostname') do | host |
      opts[:host] = host
    end
  
    o.on('-u','--user <user>','AMQP username') do | user |
      opts[:user] = user
    end
  
    o.on('-p','--pass <pass>','AMQP password') do | pass |
      opts[:pass] = pass 
    end
  
    o.on('-c','--file <filename>',"Use the given configuration file for options") do | file |
      opts[:file] = file 
    end
  
    o.on('-t','--ontop','Stay on top (does not daemonize)') do
      opts[:ontop] = true
    end
  
    o.on('-s','--stop','Stop daemon') do
      opts[:command] = "stop"
    end
  
    o.on('-h','--help','This help screen') do | nix |
      puts o
      abort ""
    end
  
  end
  
  parser.parse!

  # overwrite file options with CLI options
  if opts[:file]
    opts = YAML.load_file(opts[:file]).merge(opts)
  end

  # overwrite given options with CLI options
  opts = given_opts.merge(opts) if given_opts

  opts[:proc] = block || nil
  opts[:command] ||= "start"
  daemons_argv = [opts[:command]]
  
  unless opts[:command] == "stop"
    puts "Want to save these options?  Use this as a configuration file, and use -f to find it next time."
    puts YAML.dump(opts.reject { |k, v| [:proc,:command].include? k})
  end

  opts[:icon] = File.expand_path(File.join(File.dirname(__FILE__), '..', 'resources','amqp.jpg'))
  
  Daemons.run_proc("growlamqp", { :multiple => true,
                                  :ARGV => daemons_argv,
                                  :ontop => opts[:ontop]
                                  } ) do 
    trap(:INT) do AMQP.stop { EM.stop_event_loop }; abort "" end
    AMQP.start(opts) do
  
      queue = MQ::Queue.new(MQ.new,opts[:queue], :autodelete => true) 
      queue.bind(opts[:exchange], :routing_key => opts[:key])
      
      queue.subscribe do | header, body |
        
        message = opts[:proc] ? opts[:proc].call(body) : body
        if ! message.nil? 
          Growl.notify do | m |
            m.image = opts[:icon]
            m.message = message
          end
        end
  
      end
    end
  
  end
end