feat: send new post/topic event in batches

src/socket.io/helpers.js

@@ -14,10 +14,31 @@ var privileges = require('../privileges');
 var notifications = require('../notifications');
 var plugins = require('../plugins');
 var utils = require('../utils');
+var batch = require('../batch');
 
 var SocketHelpers = module.exports;
 
 SocketHelpers.notifyNew = function (uid, type, result) {
+	async.waterfall([
+		function (next) {
+			user.getUidsFromSet('users:online', 0, -1, next);
+		},
+		function (uids, next) {
+			uids = uids.filter(toUid => parseInt(toUid, 10) !== uid);
+			batch.processArray(uids, function (uids, next) {
+				notifyUids(uid, uids, type, result, next);
+			}, {
+				interval: 1000,
+			}, next);
+		},
+	], function (err) {
+		if (err) {
+			return winston.error(err.stack);
+		}
+	});
+};
+
+function notifyUids(uid, uids, type, result, callback) {
 	let watchStateUids;
 	let categoryWatchStates;
 	let topicFollowState;
@@ -26,10 +47,6 @@ SocketHelpers.notifyNew = function (uid, type, result) {
 	const cid = post.topic.cid;
 	async.waterfall([
 		function (next) {
-			user.getUidsFromSet('users:online', 0, -1, next);
-		},
-		function (uids, next) {
-			uids = uids.filter(toUid => parseInt(toUid, 10) !== uid);
 			privileges.topics.filterUids('topics:read', tid, uids, next);
 		},
 		function (uids, next) {
@@ -48,23 +65,21 @@ SocketHelpers.notifyNew = function (uid, type, result) {
 		function (uids, next) {
 			plugins.fireHook('filter:sockets.sendNewPostToUids', { uidsTo: uids, uidFrom: uid, type: type }, next);
 		},
-	], function (err, data) {
+		function (data, next) {
-		if (err) {
+			post.ip = undefined;
-			return winston.error(err.stack);
-		}
-
-		post.ip = undefined;
 
-		data.uidsTo.forEach(function (toUid) {
+			data.uidsTo.forEach(function (toUid) {
-			post.categoryWatchState = categoryWatchStates[toUid];
+				post.categoryWatchState = categoryWatchStates[toUid];
-			post.topic.isFollowing = topicFollowState[toUid];
+				post.topic.isFollowing = topicFollowState[toUid];
-			websockets.in('uid_' + toUid).emit('event:new_post', result);
+				websockets.in('uid_' + toUid).emit('event:new_post', result);
-			if (result.topic && type === 'newTopic') {
+				if (result.topic && type === 'newTopic') {
-				websockets.in('uid_' + toUid).emit('event:new_topic', result.topic);
+					websockets.in('uid_' + toUid).emit('event:new_topic', result.topic);
-			}
+				}
-		});
+			});
-	});
+			setImmediate(next);
-};
+		},
+	], callback);
+}
 
 function getWatchStates(uids, tid, cid, callback) {
 	async.parallel({