socket.io on('connection') triggers without actual connections - node.js

var http = require('http');
var express = require('express');
var app = express();
var server = http.createServer(app);
server.listen(3000);
var io = require('socket.io').listen(server);
io.set('log level', 1);
io.sockets.on('connection', function(socket) {
console.log('connected');
});
after running
node server.js
sometimes 'connected' is logged to console without actual connection where does it come from?

Related

socket.io server - express error in log "no routes defined on app"

Im setting up a chat server with socket.io. I followed their tutorial til it came to SSL. I found some explainations here on stack and tutorials in the net, so i came up with the following code.
I replaced my real domain with "my-domain.de"
var app = require('express')();
var fs = require('fs');
var https = require('https');
var io = require('socket.io')(https);
var mysql = require('mysql');
var options = {
key: fs.readFileSync('/etc/letsencrypt/live/my-domain.de/privkey.pem'),
cert: fs.readFileSync('/etc/letsencrypt/live/my-domain.de/cert.pem'),
ca: fs.readFileSync('/etc/letsencrypt/live/my-domain.de/chain.pem')
};
var serverPort = 8443;
var server = https.createServer(options, app);
server.listen(serverPort, function(){
console.log('listening on *:' + serverPort);
});
io.on('connection', function(socket){
console.log('a user connected');
});
The Server runs, but the Client doesnt recieve the socket.io.js. So i started the server with DEBUG=* -node index.js to see whats happening. It shows the following Error when a client tried to connect:
express:application no routes defined on app +9s
finalhandler default 404 +0ms
The Client looks like this:
<script src="https://my-domain.de:8443/socket.io/socket.io.js"></script>
<script>
$(function () {
var socket = io('https://my-domain.de:8443/');
</script>
After hours of headache i found the solution and it is as simple as always...
I simply had to place var io = require('socket.io')(server); after var server = https.createServer(options, app); So that it can route correctly...
So that my final server code looks like this:
var app = require('express')();
var fs = require('fs');
var https = require('https');
var mysql = require('mysql');
var options = {
key: fs.readFileSync('/etc/letsencrypt/live/my-domain.de/privkey.pem'),
cert: fs.readFileSync('/etc/letsencrypt/live/my-domain.de/cert.pem'),
ca: fs.readFileSync('/etc/letsencrypt/live/my-domain.de/chain.pem')
};
var serverPort = 8443;
var server = https.createServer(options, app);
var io = require('socket.io')(server); // HERE TO PUT THE DAMN SOCKET.IO!!
server.listen(serverPort, function(){
console.log('listening on *:' + serverPort);
});
io.on('connection', function(socket){
console.log('a user connected');
});

How to connect socket.io in ExpressJS

Good morning why this code don't work (server respond but "io.on" no):
var express = require('express');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
//this code not work in console // even it can not see
io.on('connection', function(socket) {
console.log('a user connect');
socket.on('disconnect', function() {
console.log('a user disconnect');
});
});
//server respond
http.listen(3000, function() {
console.log('Server running at 3000');
});
I'm a beginner, express and socket.io i downloaded by npm
You need to have a server as well as a client which will make a connection to the socket io server.
Based on what I understood from your code, I guess you want to do something like this:
First your server.js:
#!/usr/bin/env node
var http = require('http');
var express = require('express');
var app = express();
var io = require('socket.io');
var port = 3000;
app.set('port', port);
var server = http.createServer(app);
server.listen(port);
var socketio = io.listen(server);
setInterval(function() {
console.log("Emitting..");
socketio.emit('data', {"x":"123"});
}, 2000);
module.exports = app;
Then your client.html: (I am writing a client, which will log into browser console.)
<html>
<head></head>
<body>
<script src="http://localhost:3000/socket.io/socket.io.js"></script>
<script>
var socket = io.connect("http://localhost:3000/");
socket.on('connect', function() {
console.log('connected');
});
socket.on('disconnect', function(){
console.log('disconnected');
});
socket.on("data", function(data) {
console.log(data);
});
</script>
</body>
That's it. Now start your server with node server.js and then, open up client.html in your browser and check console. Let me know, if there's anything unclear.

socket io connecting but not emmiting

i have socket io redis and express pubsub going on, in my local host it works just fine i am using laravel events to publish to redis then socket io is supposed to emit the message, its working okay on local host but on my production server which is an ec2 vm it only gets to connect and i can see a console message 'connected' but it does not emit any events even though messages are being published to redis here is my client and server
//client
<script type="text/javascript">// <![CDATA[
var socket = io.connect('http://127.0.0.1:3000/');
socket.on('connect', function(data){
//socket.emit('subscribe', {channel:'score.update'});
console.log('connected');
});
socket.on('notification.update', function (data) {
//Do something with data
console.log('Notification Caught: ', data);
});
// ]]></script>
//server
var express = require('express'),
http = require('http'),
server = http.createServer(app);
var app = express();
const redis = require('redis');
const io = require('socket.io');
const client = redis.createClient();
server.listen(3000, 'localhost');
io.listen(server).on('connection', function(client) {
const redisClient = redis.createClient()
redisClient.subscribe('notification.update');
});
redisClient.on("message", function(channel, message) {
//Channel is e.g 'score.update'
client.emit(channel, message);
});
client.on('disconnect', function() {
redisClient.quit();
});
});
You need to change the listening of your server:
Change these:
var express = require('express'),
http = require('http'),
server = http.createServer(app);
var app = express();
const redis = require('redis');
const io = require('socket.io');
const client = redis.createClient();
And
server.listen(3000, 'localhost');
io.listen(server).on('connection', function(client){
//Code
});
To:
var app = require('express')();
var server = require('http').Server(app);
var io = require('socket.io')(server);
And
io.on('connection, function(client){
//Code
});
server.listen(3000, function(){
console.log("Listening on :3000");
});

Client unable to establish connection when server migrated from socket.io 0.9 to 1.0

Need help migrating socket.IO 0.9 to 1.0.
The follow 1.0 codes runs without error but it is a complete silence when my iOS client tries to connect to the server as per usual. The iOS client will get error status 400 whenever it is trying to establish socket connection with the server.
// Socket.IO 0.9 implementation
var express = require('express');
var bodyParser = require('body-parser');
var server = express(); // better instead
server.use(bodyParser.json());
server.use(bodyParser.urlencoded());
var io = require ('socket.io').listen(server.listen(port));
io.configure(function () {
io.set("transports", ["xhr-polling"]);
io.set("polling duration", 10);
io.set("close timeout", 10);
io.set('authorization', function (handshakeData, callback) {
// process handshake
});
io.set('log level', 1); // reduce logging
});
io.sockets.on('connection', function(socket) {
...
});
// Socket.IO 1.0 implementation
var express = require('express');
var bodyParser = require('body-parser');
var server = express(); // better instead
server.use(bodyParser.json());
server.use(bodyParser.urlencoded());
var io = require ('socket.io')(server.listen(port));
io.use(function(socket, next){
// never triggered!
next();
});
io.on('connection', function (socket) {
// never triggered!
});

Nodejs include socket.io in router page

I have an express node app, and I'm trying to keep my code neat by not having all the socket.io stuff in app.js
I don't know the best way to go about this. Here is my initial thought which doesn't feel like the cleanest one
// app.js
var express = require('express')
, app = express()
, server = require('http').createServer(app)
, url = require('url')
, somePage = require('./routes/somePage.js')
, path = require('path');
app.configure(function(){...});
app.get('/', somePage.index);
and the route
// somePage.js
exports.index = function (req, res, server) {
io = require('socket.io').listern(server)
res.render('index',{title: 'Chat Room'})
io.sockets.on('connection', function(socket) {
...code...
}
}
I feel like I'm close but not quite there
I don't know if I'm reading that right but it looks like you are starting a socket server on every request for /, which I'm frankly a little surprised works at all.
This is how I'm separating out the socket.io code from app.js (using express 3.x which is a bit different than 2.x):
// app.js
var express = require('express');
var app = express();
var server_port = config.get('SERVER_PORT');
server = http.createServer(app).listen(server_port, function () {
var addr = server.address();
console.log('Express server listening on http://' + addr.address + ':' + addr.port);
});
var sockets = require('./sockets');
sockets.socketServer(app, server);
// sockets.js
var socketio = require('socket.io');
exports.socketServer = function (app, server) {
var io = socketio.listen(server);
io.sockets.on('connection', function (socket) {
...
});
};
Hope that helps!
a similar approach is to pass app into index.js file and initiate http and socketio server there.
//app.js
//regular expressjs configuration stuff
require('./routes/index')(app); //all the app.get should go into index.js
Since app is passed into index.js file, we can do the app.get() routing stuff inside index.js, as well as connecting socketio
//index.js
module.exports = function(app){
var server = require('http').createServer(app)
,io = require('socket.io').listen(server);
app.get('/', function(req, res){
});
server.listen(app.get('port'), function(){
console.log("Express server listening on port " + app.get('port'));
});
io.sockets.on('connection', function(socket){
socket.on('my event', function(data){
console.log(data);
});
});
io.set('log level',1);
//io.sockets.emit(...)

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