Resetting the setInterval system so it can't blow up in our faces.

lib/payments.js

@@ -9,6 +9,7 @@ let hexChars = new RegExp("[0-9a-f]+");
 let bestExchange = global.config.payout.bestExchange;
 let xmrAPIClient = request.createClient('https://xmr.to/api/v1/xmr2btc/');
 let extraPaymentRound = false;
+let paymentTimer = null;
 
 let shapeshiftQueue = async.queue(function (task, callback) {
     // Amount needs to be shifted in as a non-completed value, as the wallet will only take non-complete values..
@@ -292,6 +293,10 @@ let paymentQueue = async.queue(function (paymentDetails, callback) {
      support JSON URI: http://10.0.0.2:28082/json_rpc Args: {"id":"0","jsonrpc":"2.0","method":"transfer","params":{"destinations":[{"amount":68130252045355,"address":"A2MSrn49ziBPJBh8ZNEhhbfyLMou6mao4C1F5TLGUatmUnCxZArDYkcbAnVkVEopWVeak2rKDrmc8JpoS7n5dvfN9YDPBTG"}],"mixin":4,"payment_id":"7e52c5266de9fede7fb3abc0cd88f937b38b51426f7b34ff99729d28ce4e1142"}} +1ms
      payments Payment made: {"id":"0","jsonrpc":"2.0","result":{"fee":40199391255,"tx_hash":"c418708643f72635edf522490bfb2cae9d42a6dc1df30dcde844862dfd88f5b3","tx_key":""}} +2s
      */
+    if (paymentTimer !== null){
+        paymentTimer.cancel();
+        paymentTimer = null;
+    }
     debug("Making payment based on: " + JSON.stringify(paymentDetails));
     let transferFunc = 'transfer';
     global.support.rpcWallet(transferFunc, paymentDetails, function (body) {
@@ -337,6 +342,7 @@ let paymentQueue = async.queue(function (paymentDetails, callback) {
 
 paymentQueue.drain = function(){
     extraPaymentRound = false;
+    paymentTimer = setInterval(makePayments, 7200000);
 };
 
 function updateShapeshiftCompletion() {
@@ -677,7 +683,7 @@ function init() {
         });
     }, 60000);
     setInterval(determineBestExchange, 60000);
-    setInterval(makePayments, 7200000);
+    paymentTimer = setInterval(makePayments, 7200000);
     makePayments();
 }