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showing results for - "socket io middleware"
Miguel
05 Feb 2017
1const express = require('express');
2const socketio = require('socket.io');
3
4// Setup server and socket
5const port = 3000;
6const app = express();
7const server = app.listen(port, console.log(`Listening on port ${port}...`));
8const io = socketio(server);
9
10// Calls the middleware on every new connection
11io.use((socket, next) => {
12  if (/* should connect socket */) {
13    next();
14  } else {
15    next(new Error('Connection failed.'));
16  }
17});
18
19io.on('connection', (socket) => {
20  // Calls the middleware on every event
21  socket.use((packet, next) => {
22    const event = packet[0];
23    const data = packet.slice(1);
24    
25    if (/* should run event */) {
26      next();
27    } else {
28      next(new Error('Failed to emit the event.'));
29    }
30  });
31
32  // Example event
33  socket.on('msg', (data) => {
34    socket.broadcast.emit('msg', data.msg);
35  });
36});
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