Class: SimplePubSub::Server

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

Class Method Summary collapse

Class Method Details

.start(host: '0.0.0.0', port: 59000) ⇒ Object 



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# File 'lib/simplepubsub.rb', line 14

def self.start(host: '0.0.0.0', port: 59000)


  EM.run do

    subscribers = {}

    WebSocket::EventMachine::Server.start(host: host, port: port) do |ws|

      ws.onopen do
        puts "Client connected"
      end

      ws.onmessage do |msg, type|

        puts "Received message: #{msg}"

        a = msg.split(/\s*:\s*/,2)

        def ws.subscriber?() 
          false
        end
       
        if a.first == 'subscribe to topic' then

          topic = a.last.rstrip.gsub('+','*')\
                                          .gsub('#','*//').gsub('or','|')
          subscribers[topic] ||= []
          subscribers[topic] << ws

          # affix the topic to the subscriber's websocket
          def ws.subscriber_topic=(topic)  @topic = topic     end
          def ws.subscriber_topic()  @topic                   end

          ws.subscriber_topic = topic

        elsif a.length > 1

          puts "publish this %s: %s" % a
          current_topic, message = a

          reg = XMLRegistry.new
          reg[current_topic] = message

          subscribers.each do |topic,conns|

            node = reg.doc.root.xpath topic.gsub(/\S\b/,'\0/text()')

            if node.any? then                  
              conns.each {|x| x.send current_topic + ': ' + message}
            end

          end

          #ws.send msg, :type => type

        end

      end

      ws.onclose do
        puts "Client disconnected"
        if ws.respond_to? :subscriber_topic then
          subscribers[ws.subscriber_topic].delete ws 
        end
      end
    end

  end
end