NodeJS, socketIO, multiple files - node.js

I'm a little bit confused;
I would like to use socketIO on NodeJS app.
I've created this (pseudo)code:
//server.js
var app = express();
//some code...
var router = require('./app/router');
app.use(router);
var server = app.listen(appConfig.app.port, function () {
var port = server.address().port;
});
var io = require('socket.io')(server);
io.on('connection', function (client) {
console.log('Client connected...');
client.on('join', function (data) {
console.log(data);
});
});
//client.js
var socket = io.connect('http://localhost:5555');
socket.on('connect', function(data) {
socket.emit('join', 'Hello World from client');
});
Everything is fine. But !
At now, I would like to emit event in another file.
I have router and POST request. I want to emit event on POST request (request handler is in another file).
//router.js
router.route("/addmenu").post(function (req, res) {
menuModel.addMenu(req.body,function(data){
//I WANT EMIT HERE
res.json(data)
});
};
);
I have to initialize router before start server, but I have to pass server to IO... How pass IO to router ?

You can try this
//server.js
var app = express();
//some code...
var io;
var getIOInstance = function(){
return io;
};
var router = require('./app/router')(getIOInstance);
app.use(router);
var server = app.listen(appConfig.app.port, function () {
var port = server.address().port;
});
io = require('socket.io')(server);
io.on('connection', function (client) {
console.log('Client connected...');
client.on('join', function (data) {
console.log(data);
});
});
//router.js
module.exports = function(getIOInstance){
router.route("/addmenu").post(function (req, res) {
menuModel.addMenu(req.body,function(data){
//I WANT EMIT HERE
getIOInstance().sockets.emit(...)
res.json(data)
});
};
return router;
);
This solution will work if you want to 'notify' all connected clients.
If you need to notify only a specific client, then I will advise you to use an event-emitter module in order to communicate these events and not share your socket instances across multiple files.

In router.js you can do something like:
//router.js
module.exports = function(io) {
var router = //What you declared it to be
router.route("/addmenu").post(function (req, res) {
menuModel.addMenu(req.body,function(data){
//I WANT EMIT HERE
res.json(data)
});
};
);
return router;
}
//server.js
//Change this line to be like the one below
var router = require('./app/router');
//.........
//.......
//Desired way
var router = require('./app/router')(io);

The answer of #jahnestacado does the job, but in case you already have an existing code base, then you need to change the structure of each file, where you might need the socket.io object, to pass it in as an argument.
A better way to do it then, would be:
To create the getIO() function—just as #jahnestacado did—, where you instantiate the io object (inside server.js), and export it.
var io;
exports.getIO = () => io;
Then require it wherever you need it. But make sure to execute the function only when you need it. Typically inside your controller function:
const getIO = require('../server').getIO;
exports.updateSAE = (req, res) => {
let io = getIO();
io.emit();
// rest of your controller function code
}
Note that I did not call the getIO function outside the controller function. For example, the following would probably not work:
const getIO = require('../server').getIO;
var io = getIO();
exports.updateSAE = (req, res) => {
io.emit();
// rest of your controller function code
}
Simply because the socket.io object could have not been initialized when you call the function, thus returning undefined.

Related

'Sharing' object between NodeJS modules

I'm new to NodeJS development and I'm doing some tests with the socket.io library. Basically, what I want to do is to stablish a socket.io connection between the clients (Angular 6 web app) and the server and broadcast a message when a new user connects.
Right now, the code is quite simple, and this is what I have:
app.js
var express = require('express');
var http = require('http');
var socketIO = require('socket.io');
// Routes
var twitterRoutes = require('./routes/user');
var app = express();
var server = http.Server(app);
var io = socketIO(server); // <== THIS OBJECT IS WHAT I WANT TO USE FROM THE ROUTES
[ ... ]
io.on('connect', (socket) => {
console.log('New user connected');
socket.on('disconnect', (reason) => {
console.log('User disconnected:', reason);
});
socket.on('error', (err) => {
console.log('Error in connection: ', err);
});
});
I want to use the io object inside the user route, but I don't know how to do it:
routes/user.js
var express = require('express');
var config = require('../config/config');
var router = express.Router();
router.post('/login', (req, res, next) => {
// DO ROUTE LOGIC
// I WANT TO BROADCAST THE NEW LOGGED USER USING io.broadcast.emit, BUT DON'T KNOW HOW
// <=====
});
How could I do it? Thanks in advance,
Not sure if it is the best way but you could share things between request handlers using middleware
// define and use a middleware
app.use(function shareIO(req, res, next) {
req.io = io;
next();
})
Then you could use req.io inside request handlers.
router.post('/login', (req, res, next) => {
// DO ROUTE LOGIC
req.io.emit('event')
});
You could do what you want by injecting your IO var in a function
// app.js
var app = express();
var server = http.Server(app);
var io = socketIO(server);
server.use(require('./router')(io))
...
// router.js
module.exports = function makeRouter(io) {
var router = express.Router();
router.post('/login', (req, res, next) => {
// do something with io
}
return router
}
I don't know if it's the best practice, but I've assigned the io object to a property of the global object, and I can access it from everywhere all across the application. So this is what I did:
app.js
var io = socketIO(server);
global.ioObj = io;
routes/user.js
router.post('/login', (req, res, next) => {
// DO ROUTE LOGIC
if (global.ioObj) {
global.ioObj.sockets.clients().emit('new-message', { type: 'message', text: 'New user has logged in' });
}
});

Accessing socket controller from model in NodeJS

So I'm working on a school project and we've got a code template.
I have a mysql database running, and whenever a certain table gets an insert, I want anyone viewing the table on the website to have it updated using socket.io.
But I cannot access the socketcontroller from the model, nor from the routecontroller(where I call the model). I understand that it's probably best practice to return the inserted data back to the controller(via callback) and then in the controller emit the message using io.
in index.js
var httpServer = http.Server(app);
var io = require('socket.io').listen(httpServer);
io.use(sharedsession(session));
var router = require('./controller.js');
app.use('/API', router);
var socketController = require('./socketController.js');
io.on('connection', function (socket) {
socketController(socket, io);
});
var model = require('./model.js');
in socketController.js
module.exports = function (socket, io) {
socket.on('join', function (req) {
console.log(req);
var security = req.security;
socket.join(security);
});
socket.on('update', function (req) {
//this is the function i want to "call" from the model/routecontroller
});
}
in controller.js
router.post('/orders', function(req, res) {
//var socket = io(); <--- not defined
model.matchOrder(req.body, function(result) {
res.json({order: req.body});
})
});
in model.js
function createTrade(security, price, amount, buyer, seller) {
console.log("Trade created");
//var socket = io() <-- not defined
Trades.create({
security: security,
price: price,
amount: amount,
buyer: buyer,
seller: seller
});
}
So 1. Where should i try to access the socket, in controller.js or model.js?
and 2. How do i get access to io() from controller.js/model.js?

dynamically calling functions exported in node

I'm new to node and gradually learning
I've app.js file which is server and app_functions.js which holds all my app functions
var express = require('express');
var app_functions = require ('./app_functions');
var app = express();
app.get('/', function (req, res) {
res.send('Running NODE!');
});
// Ex: when I request http://ip.address:3000/functionOne
app.get('/:method', function (req, res) {
// I want to call function that "method" holds i.e, in this case 'functionOne'
// and that function will reside in app_functions.js
});
var server = app.listen(3000, function () {
console.log('Server listening');
});
I was able to call those functions using global[] when they are in same file.
My app_functions.js goes like this
exports.functionOne = function functionOne() {
return "functionOne executed";
};
exports.functionTwo = function functionTwo() {
return "functionTwo executed";
};
Please help me. Thanks in advance.
There is no problem with it. Just take property of object and then execute it with (). Example (also here I check that property is function):
var express = require('express');
var app_functions = require('./app_functions');
var app = express();
app.get('/', function(req, res) {
res.send('Running NODE!');
});
// Ex: when I request http://ip.address:3000/functionOne
app.get('/:method', function(req, res) {
// I want to call function that "method" holds i.e, in this case 'functionOne'
// and that function will reside in app_functions.js
if (typeof app_functions[req.params.method] === 'function') {
app_functions[req.params.method]();
}
});
var server = app.listen(3000, function() {
console.log('Server listening');
});

how to emit.to a socket.io room from within express route

I have the following code structure:
/app.js
var user = require('./server/routes/api/user');
var io = require('socket.io').listen(server);
require('./server/sockets/base')(io);
I know I can emit events the following way (tested and works)
io.to("someroom").emit("news", "news");
Problem is, I want to be able to emit the event from my route file, which doesn't have access to the io object.
/routes/api/user.js
router.post('/login', function(req, res){
// HERE I WANT TO EMIT THE EVENT BY USING io.to("someroom").emit("news", "news");
// I TRIED req.socket.emit('news', { hello: 'world' }); without luck
}
What would be the easiest way to emit with this folder structure?
Your route needs the io object, so you'll have to pass it as a parameter.
In user.js:
module.exports = function (io) {
// all of this router's configurations
router.post('/login', function (req, res, next) {
io.to('someroom').emit('news', 'news');
});
return router;
}
When you use the route, give it a reference to io:
app.use(..., user(io));
const io = require('socket.io').listen(server);
app.set('io', io);
and then in the router
router.get('/', (req, res) => {
req.app.get('io').to('someroom').emit('news', 'news');
});
Just export the socket and require it in any file you want to use it from.
/socket.js
var server = require('./app.js');
var io = require('socket.io').listen(server);
module.exports = io;
/app.js
module.exports = server;
var user = require('./server/routes/api/user');
var io = require('./socket.js');
require('./server/sockets/base')(io);
/routes/api/user.js
var io = require('../../../socket.js');
router.post('/login', function(req, res){
io.to("someroom").emit("news", "news");
}

Why Express.js' app.get() can only work in the same file app.listen() is called?

When app.listen() is in the same file as app.get(), it works; and when I add app.get() calls in other files via require, they don't work:
// ~ means root folder
// This below is in ~/index.js
var routes = require('~/routes/routes.js');
var server = app.listen(3000, function () {
console.log('Listening on port %d', server.address().port);
});
app.get('/snails', function (req, res) {
res.send('ESCARGOT');
});
// This below is in ~/routes/routes.js
var app = module.exports = require('exports')();
app.get('/birds', function () {
res.send('PENGUIN');
});
// SUCCESS -> localhost:3000/snails will return "ESCARGOT"
// FAIL -> localhost:3000/birds will return "Cannot GET /birds"
Second example to prove the point; this time, app.listen() is moved to routes.js:
// ~ means root folder
// The below is in ~/index.js
var routes = require('~/routes/routes.js');
app.get('/snails', function (req, res) {
res.send('ESCARGOT');
});
// The below is in ~/routes/routes.js
var app = module.exports = require('exports')();
app.get('/birds', function () {
res.send('PENGUIN');
});
var server = app.listen(3000, function () {
console.log('Listening on port %d', server.address().port);
});
// FAIL -> localhost:3000/snails will return "Cannot GET /snails"
// SUCCESS -> localhost:3000/birds will return "PENGUIN"
Why is this so? Is it because app.listen() only targets the file that it is called in?
You need to export your app and include it in your routes file
module.exports = app;
And then in your routes file
var app = include('pathtoyourapp.js');
Then you'll have access to your app in your routes file.
You should be doing something along the lines of this in routes/routes.js
module.exports = function(app) {
app.get('/birds', function(req, res, next) {
res.send('Hello');
});
};
and in the index.js
var app = express();
app.get('/snails', function(req, res, next) {
res.send('SNAILS');
});
require('./routes/routes')(app);
app.listen(3000);
should now work.
BTW i'm not 100% sure what you are trying to do by doing require('exports')(), and it looks weird that you are actually exporting that, instead of the app (that contains the new birds route) in routes/routes.js, so that's why it probably doesn't work. Try the way I suggested.
Let me know if you need any additional things.
Use example:
var express = require('express'),
http = require('http'),
port = Number(process.env.PORT || 3000),
app = express();
app.get('/', function(req, res) {
res.end('Test message');
});
http.createServer(app).listen(port);
Most important is:
http.createServer(app).listen(port);
Send app argument for manipulation of servers behaviors.

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