How can I export socket.io connection to another controller

问题

I am stuck in a problem.

I am making a Socket.IO connection in the bin file which is working, but can anyone tell me how I can export this connection to different controller. This is my bin file code.

var app = require('../app');
var debug = require('debug')('userservice:server');
var http = require('http');

/**
 * Get port from environment and store in Express.
 */

var port = normalizePort(process.env.PORT || '3015');
app.set('port', port);

/**
 * Create HTTP server.
 */

var server = http.createServer(app);
var io = require('socket.io')(server);
io.on('connection', (socket) => {
  console.log('Connection made #######################################################.', socket.id);
  socket.on('disconnect', () => {
    console.log('Connection disconnected @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@.', socket.id);
  });
});
/**
 * Listen on provided port, on all network interfaces.
 */

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

回答1:

There is plenty of techniques can be used to re-use the socket instance, an easy and simple one is to create a singular class, to be able to:

Initiate socket instance
Export the instance to other modules

socket.js:

let io;

module.exports = {
  init: (server) => {
    io = require('socket.io').listen(server); io.origins('*:*');
    return io;
  },
  get: () => {
    if (!io) {
      throw new Error("socket is not initialized");
    }
    return io;
  }
};

server.js:

const app = require('../app');
const http = require('http');

/**
 * Get port from environment and store in Express.
 */

const port = '3015';
app.set('port', port);

/**
 * Create HTTP server.
 */

const server = http.createServer(app);
const io = require('./socket.js').init(server);

io.on('connection', (socket) => {
  console.log('Connection success', socket.id);
  socket.on('disconnect', () => {
    console.log('Connection disconnected', socket.id);
  });
}

Now you can use it in other modules.

const io = require('./socket.js').getio();

回答2:

You could just create a socket.io controller module that exports a function that you call for every new connection.

So, in your current server file, you add this:

const {socketConnected} = require('socketController.');

And, you modify this portion to call it for each new socket:

var server = http.createServer(app);
var io = require('socket.io')(server);
io.on('connection', (socket) => {
  console.log('Connection made #######################################################.', socket.id);
  // tell controller about new socket (and pass the io instance)
  socketConnected(socket, io);
  socket.on('disconnect', () => {
    console.log('Connection disconnected @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@.', socket.id);
  });
});

Then, your socket controller can be like this:

module.exports.socketConnected = function(socket, io) {
    // new socket.io socket connected
    console.log(`controller: got socket.io connection ${socket.id}`);

    // register appropriate event handlers on the socket here
}

来源：https://stackoverflow.com/questions/59551831/how-can-i-export-socket-io-connection-to-another-controller

标签

node.js

Socket.IO