SocketIO volatile emit to namespace

Question

SocketIO volatile emit to namespace

The following is failing with the error TypeError: Cannot read property 'volatile' of undefined (i.e. map doesn't have a volatile emit method):

io = require("socket.io").listen(server)
map = io.of "/map"

temp = []

recieveDataFromSomewhere = (hit) ->
  temp.push hit

setInterval ->
    map.volatile.emit 'data', temp
    temp = []
, 1000

I need to use volatile messages as the overhead of SocketIO keeping track of receipts is causing latency to rise problematically over time.

javascript
node.js
websocket
socket.io

Answer 1

Not sure if you can emit volatile messages to the namespace. Try emitting to the socket connected on the namespace.

var io = require("socket.io").listen(server);

var map = io.of("/map");

map.on("connection", function(socket) {
    socket.volatile.emit('data');
});

If you want to send to all connected clients you could do something like:

Object.keys(io.nsps['/map'].connected).forEach(function(socketID) {
    io.nsps['/map'].connected[socketID].volatile.emit('data')
});