Get remote endpoint properties on node.js socket close/end events - sockets

Question

I have a node.js server which keeps track of all "clients" connected to it, using an associative array of sockets, because I need to send some data to specific clients sometimes. The keys in that array are strings composed of
socket.remoteAddress + ':' + socket.remotePort
and values are socket instances passed to the callback provided to net.createServer(...)
Sometimes the clients disconnect for one reason or another and I receive the 'end' and then 'close' events. I'd like to remove the disconnected clients from my client registry but in the close/end event callbacks, the remoteAddress and remotePort variables are undefined. Can they be retrieved somehow?
To illustrate:
var registry = {}
var server = net.createServer(function (socket) {
socket.on('connect', function(){
registry [socket.remoteAddress + ':' + socket.remotePort] = socket;
});
socket.on('close', function(had_error){
// ******************************************************
// socket.remoteAddress and remotePort are undefined here
// ******************************************************
var id = socket.remoteAddress + ':' + socket.remotePort;
// *************************************************************
if(registry.hasOwnProperty(id)
delete socket.id;
});
});

Answer 1

I think you should use socket.id instead of creating your own object property that might not be unique
socket.on('connect', function(){
registry [socket.id] = socket;
});
UPDATE
Node provides basic http API. Http is stateless. HTTP sessions allow associating information with individual visitors but node doesn't have a native sessions support.
Take a look at express, it is a nice web framework with sessions support
Also, if you need to send messages in a realtime fashion, take a look at socket.io
UPDATE V2
You can add your own ID property to the socket object:
function randomID(len){
//Generate a random String
return randID;
}
var registry = {}
var server = net.createServer(function (socket) {
socket.on('connect', function(){
var uid = randomID(32);
socket.id = uid;
registry [uid] = socket;
});
socket.on('close', function(had_error){
var uid = socket.id;
// *************************************************************
console.log("Socket ID " + uid + " disconnected")
});
});