Only send stats to clients if there is a client watching them.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3846 ed5197a5-7fde-0310-b194-c3ffbd925b24

core/core.js

@@ -6,6 +6,7 @@ var app = require("app");
 var gProcessIndex = 0;
 var gProcesses = {};
 var gSessionIndex = 0;
+var gStatsTimer = false;
 
 var gGlobalSettings = {
 	index: "/~core/index",
@@ -157,6 +158,7 @@ async function getProcessBlob(blobId, key, options) {
 			process.lastActive = Date.now();
 			process.lastPing = null;
 			process.timeout = options.timeout;
+			process.stats = false;
 			var resolveReady;
 			var rejectReady;
 			process.ready = new Promise(function(resolve, reject) {
@@ -548,14 +550,20 @@ async function loadSettings() {
 }
 
 function sendStats() {
+	var any = false;
 	for (var process of Object.values(gProcesses)) {
-		if (process.app) {
+		if (process.app && process.stats) {
 			process.app.send({action: 'stats', stats: getStats()});
+			any = true;
 		}
 	}
-	setTimeout(sendStats, 1000);
+
+	if (any) {
+		setTimeout(sendStats, 1000);
+	} else {
+		gStatsTimer = false;
+	}
 }
-setTimeout(sendStats, 1000);
 
 loadSettings().then(function() {
 	var auth = require("auth");