gistfile1.txt

var ssh = require('ssh2');
var Promise = require('bluebird');
var sshConnectionReady = false;
var sshConnection;

const EventEmitter = require('eventemitter3');
const emitter = new EventEmitter();

function connect() {

  sshConnection = new ssh.Client();

  sshConnection.connect({
    host: config['QN_Address'],
    port: 22,
    username: 'ec2-user',
    privateKey: require('fs').readFileSync(config['QN_Key'])
  });

  sshConnection.once('ready', () => {
    emitter.emit('ready');
    sshConnectionReady = true;

  });

  sshConnection.once('error', () => {
    sshConnectionReady = false;
  });
}

function getConfig() {
  connect();
}

function getConnection() {
  return new Promise((resolve, reject) => {
    if (sshConnectionReady) {
      resolve(sshConnection);
    } else {
      emitter.once('ready', () => resolve(sshConnection))
    }
  });
}