multi-core vanity gen for ripple addy

const cluster = require('cluster');

if(cluster.isMaster){
  var numWorkers = 4;
  let workers = {};
  for(let i=0; i<numWorkers; i++){
    cluster.fork();
  }

  cluster.on('online', worker => {
    console.log("MasterCluster:", `Cluster ${worker.process.pid} online.`);
    workers[worker.process.pid] = worker;
  });

  cluster.on('exit', worker => {
    console.log("MasterCluster:", `Cluster ${worker.process.pid} exited.`);
    if(workers[worker.process.pid]) delete workers[worker.process.pid];
  });

  cluster.on('message', message => {
    console.log(`${message.pid}: ${message.text}`);
  });
}else{
  const keypairs = require('ripple-keypairs');
  var genOptions = {};

  async function generateAddy(){
    let secret, keypair, address;

    let addyInfo = {secret: '', address: ''};

    let hps = 0;
    let last = new Date().getTime();
    while(!/^[r][0-9][d][2]/i.test(addyInfo.address)){
      secret = keypairs.generateSeed(genOptions);
      keypair = keypairs.deriveKeypair(secret);
      address = keypairs.deriveAddress(keypair.publicKey);

      addyInfo = {secret: secret, address: address};

      hps++;

      if(last+1000 < new Date().getTime()){
        let khps = hps/1000;
        console.log(process.pid, "kH/s:", khps);

        hps = 0;
        last = new Date().getTime();
      }

      sleep(0); // in ms, to reduce the cpu usage
    }

    console.log(process.pid, "DONE:", addyInfo);
    //generateAddy();
  }

  function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
  }

  generateAddy();

}