Firstly, we'll set up the client side that does not change from the official way.

If in any case you didn't follow the official guide, here is how a basic client side implementation should look like:

<script src="/socket.io/socket.io.js"></script>
<script>
  const socket = io('http://localhost');
  // And everything else...
</script>

As for server side, we'll have to initialize the io object passing to it 'app.server':

const Zinky = require('zinky');
var app = new Zinky();
var io = require('socket.io')(app.server);
io.on('connection', (socket) => {
  console.log('socket connected')
  socket.on('disconnect', () => {
    console.log('socket disconnected')
  });
});

Attach to app

Before we can use Socket.IO in app modules, we have to append it to app object and reload the modules:
So app.js will look like:

const Zinky = require('zinky');
var app = new Zinky();
var io = require('socket.io')(app.server);
app.io = io;
app.loadModules();

Track connections

Tracking sockets connections is done in modules constructor.

Eg:

const Zinko = require('zinko');

class Auth extends Zinko {

  constructor(dirname, app) {
    super(dirname, app);
    if (app.io) {
      app.io.on('connection', (socket) => {
        console.log('socket connected')
        socket.on('disconnect', () => {
          console.log('socket disconnected')
        });
      });
    }
  }

}

In operations

In operations, it is possible to use the Socket.IO server.

Eg:

const Zinko = require('zinko');

class Auth extends Zinko {

  POST_login(req, res) {
    // login code...
    req.A.io.emit('A new logged-in user');
  }

}

Use Socket.IO in only one module

If we want just use Socket.IO in only one module without having to declare it in app.js, we can do that, this way:

const Zinko = require('zinko');

class Auth extends Zinko {

  constructor(dirname, app) {
    super(dirname, app);
    this.io = require('socket.io')(app.server);
    this.io.on('connection', (socket) => {
      console.log('socket connected')
      socket.on('disconnect', () => {
        console.log('socket disconnected')
      });
    });
  }

}

In this case, instead of using req.A.io use this.io in operations.

So, using the same example of operations we saw earlier, the code will be like this:

const Zinko = require('zinko');

class Auth extends Zinko {

  POST_login(req, res) {
    // login code...
    this.io.emit('A new logged-in user');
  }

}

Hope this helped you! If you need any help don't hesitate to ask for it here:https://github.com/zinkyJS/zinky/issues