http://developers.sribu.com/2015/02/14/how-do-we-make-sribulancer-as-a-realtime-freelancing-platforms/

server.js

socket.on('subscribe_public', function (m) {
  socket.join(m.channel);
});

socket.on('subscribe_private', function (m) {
  if (m.jwt && is_valid_jwt(m.jwt)) {
    socket.join(m.channel);
  }
});

// On redis publish event.
redis.sub.on('message', function(channel, message) {
  msg = JSON.parse(message);
  io_broadcast.in(msg.channel).emit(msg.event, msg.message);
});