Simple Chat application with NodeJS [duplicate] - node.js

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socket.emit in a simple TCP Server written in NodeJS?
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I am new to NodeJS and started to learn by building a simple command line chat application. I have the following code for Server and Client. Client-Server communication is successful but I am not able to capture 'adduser' event from the client. Please tell me where I am going wrong.
Server:
var net = require('net');
var chatServer = net.createServer(function(socket){
socket.pipe(socket);
}),
userName="";
chatServer.on('connection',function(client){
console.log("ChatterBox Server\n");
client.write("Welcome to ChatterBox!\n");
client.on('data',function(data){
console.log(""+data);
});
client.on('adduser',function(n){
console.log("UserName: "+ n);
userName = n;
});
});
chatServer.listen(2708);
Client:
var net = require('net');
var client = new net.Socket();
client.connect(2708,'127.0.0.1');
client.on('connect',function(){
client.emit('adduser',"UserName");
});
console.log("Client Connected!\n");
client.on('data',function(data){
console.log(""+data);
});

Answer 1

I guess you don't have to do from the client side :
client.connect(2708,'127.0.0.1');
Just write your client like this is sufficient.
var net = require('net');
var client = new net.Socket();
client.connect(2708, '127.0.0.1',function(){
console.log("Client Connected!\n");
client.emit('adduser',"UserName");
});
client.on('data',function(data){
console.log(""+data);
});
client.on('close', function() {
console.log('Connection closed');
});
So the server side :
var net = require('net');
var sockets = [];
var port = 2708;
var guestId = 0;
var server = net.createServer(function(socket) {
// Increment
guestId++;
socket.nickname = "Guest" + guestId;
var userName = socket.nickname;
sockets.push(socket);
// Log it to the server output
console.log(userName + ' joined this chat.');
// Welcome user to the socket
socket.write("Welcome to telnet chat!\n");
// Broadcast to others excluding this socket
broadcast(userName, userName + ' joined this chat.\n');
socket.on('adduser',function(n){
console.log("UserName: "+ n);
userName = n;
});
// When client sends data
socket.on('data', function(data) {
var message = clientName + '> ' + data.toString();
broadcast(clientName, message);
// Log it to the server output
process.stdout.write(message);
});
// When client leaves
socket.on('end', function() {
var message = clientName + ' left this chat\n';
// Log it to the server output
process.stdout.write(message);
// Remove client from socket array
removeSocket(socket);
// Notify all clients
broadcast(clientName, message);
});
// When socket gets errors
socket.on('error', function(error) {
console.log('Socket got problems: ', error.message);
});
});
// Broadcast to others, excluding the sender
function broadcast(from, message) {
// If there are no sockets, then don't broadcast any messages
if (sockets.length === 0) {
process.stdout.write('Everyone left the chat');
return;
}
// If there are clients remaining then broadcast message
sockets.forEach(function(socket, index, array){
// Dont send any messages to the sender
if(socket.nickname === from) return;
socket.write(message);
});
};
// Remove disconnected client from sockets array
function removeSocket(socket) {
sockets.splice(sockets.indexOf(socket), 1);
};
// Listening for any problems with the server
server.on('error', function(error) {
console.log("So we got problems!", error.message);
});
// Listen for a port to telnet to
// then in the terminal just run 'telnet localhost [port]'
server.listen(port, function() {
console.log("Server listening at http://localhost:" + port);
});
So you've got an object "users" inside the "user" when is connected, push user to the array users but you need to do (server side) on('close', ... to remove the user from users when connected is false ... etc