git clone https://github.com/sebyx07/opal-express-socketio.git opal-server
cd opal-server
bundle install && yarn install # install deps

var socket = io.connect('https://opal-realtime-socket-express.herokuapp.com', {transports:['websocket']});
// with
var socket = io.connect('http://localhost:8000', {transports:['websocket']});

Server.new(8000) do |s, io|
  s # you can access express methods: with get, post, use, etc. Most is supported
    # callbacks, you replace them with do; end blocks

  io # you can use socket-io methods: on, emit etc. Most is supported
     #  socket must be wrapped using Native()
end

Server.new(8000) do |s, io|
  # express part
  s.use(Logger) # use middlewares
  s.start! # start the server

  s.get("/") do |_, res| # handle get to root request
    res.sendFile(s.view("index.html")) # send the index html file
  end

  s.get("/:name") do |req, res| # handle dynamic requests
    res.send(req.params.name)
  end

  # socket io part
  io.on 'connection' do |socket| # initialize socket io connection
    socket = Native(socket) # if you have problems with apply for a object, just Native() it

    socket.on('chat message') do |msg| # listen for messages
      io.emit('chat message', msg) # send it back, to all clients
    end

    socket.on('disconnect') do # handle disconnect
      p "disconnect"
    end
  end
end