Class: SimplePubSub::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/simplepubsub.rb

Defined Under Namespace

Classes: PubSub

Class Method Summary collapse

Class Method Details

.connect(hostname, port: '59000', &connect_blk) ⇒ Object 



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# File 'lib/simplepubsub.rb', line 107

def self.connect(hostname, port: '59000', &connect_blk)

  pubsub = PubSub.new
  connect_blk.call(pubsub)

  blk = lambda do |ws, pubsub, em_already_running|

    ws.onopen do
      puts "Connected"
    end

    ws.onmessage do |msg, type|

      a = msg.split(/\s*:\s*/,2)
      topic, message = a
      EM.defer {pubsub.proc.call topic, message}

    end

    ws.onclose do
      puts "Disconnected"

      # reconnect within a minute
      seconds = rand(60)

      seconds.downto(1) do |i| 
        s = "reconnecting in %s seconds" % i; 
        print s 
        sleep 1
        print "\b" * s.length
      end
      puts


      self.connect hostname, port: port, &connect_blk
    end

    EventMachine.next_tick do
      ws.send pubsub.topic + ': ' + pubsub.message
    end

  end

  address = hostname + ':' + port
  params = {uri: 'ws://' + address}
  c = WebSocket::EventMachine::Client

  begin

    # attempt to run a websocket assuming the EventMachine is 
    #   already running

    ws = c.connect(params, &connect_blk)
    blk.call ws, pubsub, em_already_running = true
  rescue

    thread = Thread.new do
      EM.run do 

        ws = c.connect(params, &connect_blk)
        blk.call(ws, pubsub, em_already_running = false)
      end
    end
    thread.join
  end

end