nodejs cluster without redis, support sticky balancing / websockets

http.cluster.js

const cluster = require("cluster");
const http = require("http");
const os = require("os");
const net = require("net");
const ip = require('ip');

// create seed
const  seed = (Math.random() * 0xffffffff) | 0;

/**
 * Hash IP
 * @type Number|seed
 */
function hashHelper(ip) {

  var hash = seed;

  for (var i = 0; i < ip.length; i++) {
    var num = ip[i];

    hash += num;
    hash %= 2147483648;
    hash += (hash << 10);
    hash %= 2147483648;
    hash ^= hash >> 6;
  }

  hash += hash << 3;
  hash %= 2147483648;
  hash ^= hash >> 11;
  hash += hash << 15;
  hash %= 2147483648;

  return hash >>> 0;

}



// create standard http server
// can be in the cluster.isMaster else statemant (is slave/!isMaster)
var server = http.createServer(function (req, res) {
  res.end("Hello from, pid: " + process.pid);
});


if (cluster.isMaster) {

  // workers
  let workers = [];

  let tcp = net.Server({
    pauseOnConnect: true
  }, function balance(socket) {

    var addr = ip.toBuffer(socket.remoteAddress || '127.0.0.1');
    var hash = hashHelper(addr);

    // feedback
    console.log('balancing connection %j', addr);

    // send request to worker
    workers[hash % workers.length].send('sticky:balance', socket);

  });

  // liste for listening event
  tcp.once('listening', function () {

    let addr = this.address();
    console.log('Cluster (master) listening on %s:%d', addr.address, addr.port);
    
    for (var i = 0; i < os.cpus().length; i++) {

      let worker = cluster.fork();      
      workers.push(worker);
      
      // feedback
      console.log('worker=%d spawn', worker.process.pid);

    }

  });

  // start tcp server
  tcp.listen(3000, "0.0.0.0");

} else {


  process.on('message', function (msg, socket) {

    if (msg !== 'sticky:balance' || !socket) {
      return;
    }

    server._connections++;
    socket.server = server;
    server.emit('connection', socket);

  });


}

Based on the sticky-session module.
Support WebSockets, socket.io, Sessions & Cookies

Why ?
Because reasons....