Update to the pool to ensure that we can't "queue up" multiple GBT's.

lib/pool.js

@@ -133,7 +133,7 @@ function checkAliveMiners() {
     }
 }
 
-function templateUpdate() {
+function templateUpdate(repeating) {
     global.coinFuncs.getBlockTemplate(global.config.pool.address, function (rpcResponse) {
         if (rpcResponse) {
             rpcResponse = rpcResponse.result;
@@ -150,6 +150,9 @@ function templateUpdate() {
                     newBlockTemplate(rpcResponse);
                 }
             }
+            if (repeating !== false){
+                setTimeout(templateUpdate, 300);
+            }
         }
     });
 }
@@ -524,14 +527,14 @@ function processShare(miner, job, blockTemplate, nonce, resultHash) {
                 console.error(threadName + "Error submitting block at height " + job.height + " from " + miner.logString + ", share type: " + shareType + " error: " + JSON.stringify(rpcResult.error));
                 recordShareData(miner, job, hashDiff.toString(), false, null, shareType);
                 // Error on submit, so we'll submit a sanity check for good measure.
-                templateUpdate();
+                templateUpdate(false);
             } else if (rpcResult) {
                 //Success!  Submitted a block without an issue.
                 let blockFastHash = global.coinFuncs.getBlockID(shareBuffer).toString('hex');
                 console.log(threadName + "Block " + blockFastHash.substr(0, 6) + " found at height " + job.height + " by " + miner.logString +
                     ", share type: " + shareType + " - submit result: " + JSON.stringify(rpcResult.result));
                 recordShareData(miner, job, hashDiff.toString(), true, blockFastHash, shareType, blockTemplate);
-                templateUpdate();
+                templateUpdate(false);
             } else {
                 // RPC bombed out massively.
                 console.error(threadName + "RPC Error.  Please check logs for details");
@@ -702,12 +705,12 @@ if (cluster.isMaster) {
         worker.on('message', messageHandler);
         workerList.push(worker);
     });
-    setInterval(templateUpdate, 300);
+    templateUpdate();
     global.support.sendEmail(global.config.general.adminEmail, "Pool server "+global.config.hostname+" online", "The pool server: "+global.config.hostname+" with IP: "+global.config.bind_ip+" is online");
 } else {
     setInterval(checkAliveMiners, 30000);
     setInterval(retargetMiners, global.config.pool.retargetTime * 1000);
-    templateUpdate();
+    templateUpdate(false);
     setInterval(function () {
         bannedIPs = [];
     }, 60000);