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Jithesh Kt
Jithesh Kt

Reputation: 2043

Proper way of emitting an event from a function - Node JS - Socket.io

Assume that I have two files.

server.js

test.js

server.js have all the initialization codes in place (Mongoose, Express..etc). It also has the below code:

const io = require('socket.io')(server);

In my test.js file, I have something related to mqtt. It is irrelevant, however, please understand that I don't have any variable access in there (req, app). Because that file isn't part of the route or anything.

It is included in server.js as:

require('test.js');

I am not getting into any details of MQTT or how it works. Consider that one or more functions inside test.js is running on a specific time. So, when ever that happens, how can I emit an event using socket.io from the test.js file?

My client side dashboard is ready to receive the event. I am just confused how to design the system, especially how to access the io variable which exist in server.js file.

Upvotes: 0

Views: 192

Answers (1)

Jonas Wilms
Jonas Wilms

Reputation: 138557

As mentioned already just export a function from test.js that takes io as a parameter:

  module.exports = function test(io) {
    io.on("connection", socket => {
      socket.emit("greeting", "hello world!");
    });
 };

From your server.js you just have to pass in the argument:

 require("./test.js")(io);

Upvotes: 1

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