Develop Reference

socket.io Disconnect certain client

I am working with socket.io example for chat project. I want to add password protection to the chat application. This is just simple authentication. If user input wrong password, then server will disconnect this user.
Client side code:
var socket = io();
socket.emit('user name', username);
socket.emit('password', password);
Server side code:
socket.on('password', function (msg) {
if (msg !== '123321') {
io.emit('system info', 'Wrong password... Disconnecting ' + username+'...');
io.close(true);
return false;
}
});
The close() method doesn't work. the disconnected user still able to receive message from other users. So how to do this properly? Thank you.

Assuming you are creating an id (server side) with something like:
io.engine.generateId = (req) => {
return custom_id++; // custom id must be unique
}
You could close an specific connection using .disconnect() and you could call the id with socket.id
socket.on('password', function (msg) {
if (msg !== '123321') {
io.emit('system info', 'Wrong password... Disconnecting ' + username+'...');
io.sockets.connected[socket.id].disconnect();//<-- in this case it's just a number
}
});

socket.io rooms repeating same message per client

I'm using rooms to send a 'private' message to a client and it works however the message being sent is duplicated by the number of clients I have and I believe this is because of my .on('message') since this is still triggering for every client but only emitting to the correct client (but multiple times..)
server
io.sockets.on('connection', function(socket {
socket.on('join', function(data)
{
console.log('enter');
socket.join(data.user);
});
var rClient = redis.createClient();
rClient.subscribe('messagex');
rClient.on('message', function(channel, message) {
io.in(message.user).emit('messagex', {content: message.content});
});
socket.on('disconnect', function() {
rClient.quit();
});
});
receiver client
<script>
var username = prompt("test");
var socket = io.connect('http://localhost:8100');
socket.emit('join', {user: username});
socket.on('messagex', function(data) {
$('#messages').append('<p>' + data.content + '</p>');
});
So I have 3 clients (each with different users/rooms open) at the receiver page and I send a message from the sender to say user user1, then I will only receive the message on user1 client but it will receive 3 of the same message each time and the number of times duplicated seems to be the number of clients I have..

try this
subscribe.unsubscribe(channel);
when connection disconnect unsubscribe
io.sockets.on('connection', function(socket {
socket.on('join', function(data)
{
console.log('enter');
socket.join(data.user);
});
var rClient = redis.createClient();
rClient.subscribe('messagex');
rClient.on('message', function(channel, message) {
io.in(message.user).emit('messagex', {content: message.content});
});
socket.on('disconnect', function() {
rClient.unsubscribe('messagex');
rClient.quit();
});
});

I think you are using two channel at same time redis and socket.io, You have to make single channel i.e. socket.io only then there is no need make redis channel means no need to add pub/sub method when you transferring data through emit/on.

Node.js / Socket Chat - Userlist

I have been following a tutorial and a github (https://github.com/mmukhin/psitsmike_example_2) on how to make a multi room simple chat app. I'm fairly new to this.
I am trying to modify it to list the usernames in the right hand side under the room list. But it's not working, it doesn't seem to be throwing any errors though?
I have done the following:
index.html
I have added the following code to the original:
<div id="roomusers"></div>
and
socket.on('updateroomusers', function(roomusers) {
$("#roomusers").empty();
$.each(roomusers, function (key, value) {
$('#roomusers').append('’+value+”);
});
});
This is the original
<script src="/socket.io/socket.io.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script>
var socket = io.connect('http://localhost:8080');
// on connection to server, ask for user's name with an anonymous callback
socket.on('connect', function(){
// call the server-side function 'adduser' and send one parameter (value of prompt)
socket.emit('adduser', prompt("What's your name?"));
});
// listener, whenever the server emits 'updatechat', this updates the chat body
socket.on('updatechat', function (username, data) {
$('#conversation').append('<b>'+username + '> </b> ' + data + '<br>');
});
// listener, whenever the server emits 'updaterooms', this updates the room the client is in
socket.on('updaterooms', function(rooms, current_room) {
$('#rooms').empty();
$.each(rooms, function(key, value) {
if(value == current_room){
$('#rooms').append('<div>' + value + '</div>');
}
else {
$('#rooms').append('<div>' + value + '</div>');
}
});
});
function switchRoom(room){
socket.emit('switchRoom', room);
}
// on load of page
$(function(){
// when the client clicks SEND
$('#datasend').click( function() {
var message = $('#data').val();
$('#data').val('');
// tell server to execute 'sendchat' and send along one parameter
socket.emit('sendchat', message);
});
// when the client hits ENTER on their keyboard
$('#data').keypress(function(e) {
if(e.which == 13) {
$(this).blur();
$('#datasend').focus().click();
}
});
});
socket.on('updateroomusers', function(roomusers) {
$("#roomusers").empty();
$.each(roomusers, function (key, value) {
$('#roomusers').append('’+value+”);
});
});
</script>
<div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;">
<b>ROOMS</b>
<div id="rooms"></div>
<b>USERS</b>
<div id="roomusers"></div>
</div>
<div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;">
<div id="conversation"></div>
<input id="data" style="width:200px;" />
<input type="button" id="datasend" value="send" />
</div>
And the app.js (everything between the comments
/////////**** Userlist Start ***********///////
and
/////////**** Userlist End***********/////// is code I added
var express = require('express')
, app = express()
, http = require('http')
, server = http.createServer(app)
, io = require('socket.io').listen(server);
server.listen(8080);
// routing
app.get('/', function (req, res) {
res.sendfile(__dirname + '/index.html');
});
// usernames which are currently connected to the chat
var usernames = {};
// rooms which are currently available in chat
var rooms = ['room1','room2','room3'];
io.sockets.on('connection', function (socket) {
// when the client emits 'adduser', this listens and executes
socket.on('adduser', function(username){
// store the username in the socket session for this client
socket.username = username;
// store the room name in the socket session for this client
socket.room = 'room1';
// add the client's username to the global list
usernames[username] = username;
// send client to room 1
socket.join('room1');
// echo to client they've connected
socket.emit('updatechat', 'SERVER', 'you have connected to room1');
// echo to room 1 that a person has connected to their room
socket.broadcast.to('room1').emit('updatechat', 'SERVER', username + ' has connected to this room');
socket.emit('updaterooms', rooms, 'room1');
/////////**** Userlist Start ***********///////
// get all the clients in ‘room1′
var clients = io.sockets.clients('room1');
// loop through clients in ‘room1′ and add their usernames to the roomusers array
for(var i = 0; i < clients.length; i++) {
roomusers[roomusers.length] = clients[i].username;
/////////**** Userlist End ***********///////
}
// broadcast to everyone in room 1 the usernames of the clients connected.
io.sockets.to('room1').emit('updateroomusers',roomusers);
});
// when the client emits 'sendchat', this listens and executes
socket.on('sendchat', function (data) {
// we tell the client to execute 'updatechat' with 2 parameters
io.sockets.in(socket.room).emit('updatechat', socket.username, data);
});
socket.on('switchRoom', function(newroom){
socket.leave(socket.room);
socket.join(newroom);
socket.emit('updatechat', 'SERVER', 'you have connected to '+ newroom);
// sent message to OLD room
socket.broadcast.to(socket.room).emit('updatechat', 'SERVER', socket.username+' has left this room');
// update socket session room title
socket.room = newroom;
socket.broadcast.to(newroom).emit('updatechat', 'SERVER', socket.username+' has joined this room');
socket.emit('updaterooms', rooms, newroom);
});
// when the user disconnects.. perform this
socket.on('disconnect', function(){
// remove the username from global usernames list
delete usernames[socket.username];
// update list of users in chat, client-side
io.sockets.emit('updateusers', usernames);
// echo globally that this client has left
socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
socket.leave(socket.room);
});
});

Simple Node.js chat program NOT using socket.io

I am trying to learn Node and build a simple chat application. It seems like everyone uses socket.io. I would like to understand how to do this on a more fundamental level using get and post.
Basically, all I want to do is have a form that takes an input and reposts it below the form for everyone to see.
This is what I have so far:
//Requirements
var express = require('express');
var app = express();
//GET
app.get('/', function (req, res) {
// res.send('Hello World!');
var response =
"<HEAD>"+
"<title>Chat</title>\n"+
"</HEAD>\n"+
"<BODY>\n"+
"<FORM action=\"/\" method=\"get\">\n" +
"<P>\n" +
"Enter a phrase: <INPUT type=\"text\" name=\"phrase\"><BR>\n" +
"<INPUT type=\"submit\" value=\"Send\">\n" +
"</P>\n" +
"</FORM>\n" +
"<P>phrase</P>\n"+
"</BODY>";
var phrase = req.query.phrase;
if(!phrase){
res.send(response);
}else{
res.send(response);
res.send(phrase);
}
});
//For testing
app.get('/test', function(req, res){
res.send('I am a robot');
console.log('told visiter I am a robot');
});
//Run the app
var server = app.listen(8080, function () {
var host = server.address().address;
var port = server.address().port;
console.log('App listening at http://%s:%s', host, port);
});
I've been trying a bunch of things, but I am pretty stumped.

Did you hear about messaging backend jxm.io?
It works with JXcore (open sourced fork of Node.JS). JXM itself is an open source project, which you can find on github: jxm.
It's really fast and efficient, you can check some tutorials. For example, below is minimal code, that you need to run on server-side:
var server = require('jxm');
server.setApplication("Hello World", "/helloworld", "STANDARD-KEY-CHANGE-THIS");
server.addJSMethod("serverMethod", function (env, params) {
server.sendCallBack(env, params + " World!");
});
server.start();
The client's part can be found here:
Browser Client (JavaScript)
JXM also supports Java clients (runs on android) and node clients.

receive data from flash and display on angularJS client side

I am trying to get data (a user's score), from an extremely simple flash game I made, to be displayed on a simple leader board which is displayed through AngularJS. You can get a copy of all of the code here (you might need to run npm install to get it to work). I am using NodeJS/Express/Socket.io to transfer the data from the game.
Here is the code from app.js (server side):
var express = require('express'),
app = express(),
server = require('http').createServer(app),
io = require('socket.io').listen(server);
app.configure(function() {
app.use(express.static(__dirname + '/public'));
app.set('views', __dirname + '/views');
});
io.configure(function() {
io.set('transports', ['websocket','xhr-polling']);
io.set('flash policy port', 10843);
});
var contestants = [];
io.sockets.on('connection', function(socket) {
socket.on('data', function (data) {
socket.broadcast.emit(data);
});
socket.on('listContestants', function(data) {
socket.emit('onContestantsListed', contestants);
});
socket.on('createContestant', function(data) {
contestants.push(data);
socket.broadcast.emit('onContestantCreated', data);
});
socket.on('updateContestant', function(data){
contestants.forEach(function(person){
if (person.id === data.id) {
person.display_name = data.display_name;
person.score = data.score;
}
});
socket.broadcast.emit('onContestantUpdated', data);
});
socket.on('deleteContestant', function(data){
contestants = contestants.filter(function(person) {
return person.id !== data.id;
});
socket.broadcast.emit('onContestantDeleted', data);
});
});
server.listen(8000);
The key lines from above are:
socket.on('data', function (data) {
socket.broadcast.emit(data);
});
That is where I am trying to send the data from the server side to the client side. On the client side - from within my main controller, I have this.
leader-board.js (main client side javascript file):
socket.on('data', function(data) {
$scope.score.push(data);
})
// Outgoing
$scope.createContestant = function() {
$scope.$digest;
console.log($scope.score[0]);
var contestant = {
id: new Date().getTime(),
display_name: "Bob",
score: Number($scope.score[0])
};
$scope.contestants.push(contestant);
socket.emit('createContestant', contestant);
_resetFormValidation();
};
As you can see - I am trying to get the emitted data, and push it to an array where I will keep the scores. The createContestant function gets called when the user clicks a submit button from within the main index.html file.
index.html
<body>
...
<button ng-click="createContestant()" class="btn btn-success"
ng-disabled="
ldrbd.contestantName.$error.required ||
ldrbd.contestantScore.$error.required
"
>
Submit Score
</button>
...
</body>
The line console.log($scope.score[0]);, from within the createContestant function, is always undefined. I am not sure if I am emitting the data correctly from the server side with socket.io - and I am not sure if I am receiving it correctly either. I use $scope.$digest to refresh the scope because the socket.io stuff is outside of AngularJS (or so I have read). Any help would be greatly appreciated. Again - I am trying to store data emitted from a flash game into an array, however - before the data is stored, it needs to be fetched correctly - and my fetch always turns up undefined, when it should be retrieving a number which is being emitted from the game (I know that I am emitting the number from the game because I have tested it with log messages). Thanks!
UPDATE
Changed server side code to this:
socket.on('message', function (data) {
console.log(data)
score = data;
socket.emit('score', score);
})
...and client side to this:
socket.on('score', function(data) {
console.log(data);
$scope.score = data;
});
Still no luck - but I added the console.log message to the server side to confirm that the data was getting sent and received (at least by node) and it is - the output of that message is a number which is the score. The thing I am realizing is...the score is supposed to be input on the client side when the button is clicked. But the data gets emitted from the server side when the game is over...so when the button is clicked...is the data available to the client side in that moment? Is this the discrepancy?

Here is the working socket code (took me a while but I got it)!
Server side (Node/Express):
socket.on('message', function (data) {
console.log(data);
score = data;
console.log("Transfered:" + " " + score);
//
})
socket.on('score', function() {
socket.emit('sendscore', score);
})
Client side (AngularJS)
socket.on('sendscore', function(data) {
console.log(data);
$scope.score = data;
});
// Outgoing
$scope.createContestant = function() {
socket.emit('score')
//$scope.$digest;
//console.log($scope.score[0]);
var contestant = {
id: new Date().getTime(),
display_name: "Bob",
score: $scope.score
};
$scope.contestants.push(contestant);
socket.emit('createContestant', contestant);
_resetFormValidation();
};
The link in the question still works for the code if you want to try it yourself!