witness-pinger.js

var ping = require('ping');
var hive = require("@hiveio/hive-js")

var host = "ipAddress"
var fromNumber = "+1..."
var toNumber = "+1..."
var accountSid = 'TwillioSID';
var authToken = 'TwillioAPISecret';
var owner = 'fbslo'
var privateSignigKey = "5J..."
var props = {
  "key": "youCurrentsigninkePublicKey", 
  "new_signing_key": "STM1111111111111111111111111111111114T1Anm" 
}
let count = 0
let disabled = false

setInterval(() => {
  ping()
}, 1000 * 10)

function ping(){
  ping.sys.probe(host, function(isAlive){
    var msg = isAlive ? 'host ' + host + ' is alive' : 'host ' + host + ' is dead';
    if (!isAlive) count += 1
    if (!isAlive && count >= 3 && disabled == false) disableAndAlert()
  });
}

function disableAndAlert(){
  const client = require('twilio')(accountSid, authToken);
  const witnessOps = hive.utils.buildWitnessUpdateOp(owner, props);
  hive.broadcast.witnessSetProperties(privateSigningKey, owner, witnessOps[1].props, [], function(err, result) {
    console.log(err, result);
    disabled = true
  });

  client.messages
  .create({
     body: 'Your witness server is OFFLINE! Response: '+JSON.stringify(fetchResult),
     from: fromNumber,
     to: yourNumber
   })
  .then(message => {
    console.log(message.sid)
    console.log("SMS sent!")
  });
}