I'm trying to separate my socket.io code into a separate file (socket.js) from my main file (app.js). However, I need to define my io object in app.js, which is also used in my socket.js file.
Currently, I set io as a global variable so it is accessible from app.js (Global Variable in app.js accessible in routes?), but I understand this is bad practise. Is there a better way to do this (can injection work in this case, as I need to export a variable from the app.js to socket.js rather than the other way round)? Thank you!
app.js
var app = express(),
server = require('http').createServer(app);
//KIV -> io is set as a global variable
io = require('socket.io').listen(server);
require('./socket');
socket.js
io.sockets.on('connection', function(socket) {
//xxx
}
One of the ways is by passing the object as argument to function (as already has been described in @Thomas' answer).
Other way is to create a new file say 'global.js'. put only those items in this file that you want to be global. e.g.
var Global = {
io : { }
};
module.exports = Global;
Now, in your app.js,
var app = express(),
server = require('http').createServer(app),
global = require('./global.js');
global.io = require('socket.io').listen(server);
require('./socket');
And in your socket.js:
var global = require('./global.js');
global.io.sockets.on('connection', function(socket) {
//xxx
}
Hope it helps...
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