How to share socket instance over multiple files?

Question

I want to use socket instance from multiple files. I have written my socket connection code in App.js File. Which looks like as follow

var socketCode = require('../api/sockets/socketCode.js'); var io = require('socket.io')(server); io.on('connection', function(socket) { socketCode(io, socket); }

Now my socketCode.js File looks like follow

module.exports = (io, socket) => { test: function(data) { console.log("io", io, "\n", "socket", socket) return io; } }

Now I want to call test function from another file let's say from user.js.

My user.js looks like :

var socketCode = require('../api/sockets/socketCode.js')(); console.log(socketCode.test);

The aim is to keep separate socket code and controllers and other code. Whenever I want to emit some event/message from controller. I just want to call function inside socetCode.js Which should emit the socket event.

How can i call test living inside socketCode.js file from user.js. and it should print/log io object.

I could not find any proper file structure along with socket. I am using express js.

You did not express what your actual problem/question is?

kentor
– kentor

2017-11-29 12:37:26 +00:00
Commented Nov 29, 2017 at 12:37 — kentor
– kentor, Commented Nov 29, 2017 at 12:37
How to call test function from users.js file?

Malik Lakhani
– Malik Lakhani

2017-11-29 12:48:50 +00:00
Commented Nov 29, 2017 at 12:48 — Malik Lakhani
– Malik Lakhani, Commented Nov 29, 2017 at 12:48

kentor · Accepted Answer · 2017-11-29 13:13:42Z

1

As you already figured out how to create the module which exports a named function in socketCode.js:

module.exports = (io, socket) => { test: function(data) { console.log("io", io, "\n", "socket", socket) return io; } }

You would simply need to import this module somewhere else:

var io = "your io object"; var socket = "your socket object"; var socket = require('../api/sockets/socketCode.js')(io, socket); socket.test();

A quick explanation: You are exporting an object with functions as properties. So each function can be considered as member of your imported object.

edited Nov 29, 2017 at 13:13

answered Nov 29, 2017 at 13:00

kentor

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12 Comments

Malik Lakhani Over a year ago

i have tried, it does not work. It throws an error test is not a function. I have also tried socket.test that also not worked. And you wrote var socket = require('../api/sockets/socketCode.js')(io, socket); But suppose if i want to require it in any controller files. I would not have io and socket instance there.

kentor Over a year ago

@MalikLakhani I am sorry, your module is expecting two parameters (io and socket) which you have to pass into it. I updated my answer

Malik Lakhani Over a year ago

What i want is io should be stored when socketCode.js hit means from app.js file. So when i call socketCode from app.js file. If i log console outside the test(directly inside module.exports) it get printed. Now that io instance should be propagate in test function too. and when i call test function it should use io object.

Malik Lakhani Over a year ago

In a nutshell, Suppose i want to emit event from controller, routes, models. How can i do?

Malik Lakhani Over a year ago

i would not have those parameters inside controllers and similar files.

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Mohammed Albosifi · Accepted Answer · 2020-04-01 22:19:29Z

There is a library using the Typescript language that will help you to shorten the hard and long way , called socket-controllers

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