fix(#9508): switch to ioredis (#9545)

* switch to ioredis

also need this fix in redisearch:

redis-search.js:98
```
  redisClient.multi(cmds).exec(function(err, ids) {
    if (err) {
      return callback(err);
    }
    var errRes = ids[resultIndex];
    if (errRes[0]) {
      return callback(errRes[0]);
    }
    callback(null, errRes[1]);
  });
```

* dbsearch compatible with ioredis

* fixed dbsearch?

install/package.json

@@ -85,7 +85,7 @@
         "@nodebb/bootswatch": "3.4.2",
         "nconf": "^0.11.2",
         "nodebb-plugin-composer-default": "6.5.27",
-        "nodebb-plugin-dbsearch": "4.2.0",
+        "nodebb-plugin-dbsearch": "5.0.1",
         "nodebb-plugin-emoji": "^3.5.0",
         "nodebb-plugin-emoji-android": "2.0.5",
         "nodebb-plugin-markdown": "8.12.10",
@@ -107,7 +107,7 @@
         "postcss": "8.2.15",
         "postcss-clean": "1.2.0",
         "prompt": "^1.1.0",
-        "redis": "3.1.2",
+        "ioredis": "4.27.2",
         "request": "2.88.2",
         "request-promise-native": "^1.0.9",
         "requirejs": "2.3.6",
@@ -182,4 +182,4 @@
             "url": "https://github.com/barisusakli"
         }
     ]
-}
+}

src/database/redis/connection.js

@@ -1,37 +1,34 @@
 'use strict';
 
 const nconf = require('nconf');
-const redis = require('redis');
+const Redis = require('ioredis');
 const winston = require('winston');
-const _ = require('lodash');
 
 const connection = module.exports;
 
-connection.getConnectionOptions = function (redis) {
-	redis = redis || nconf.get('redis');
-	const connOptions = {};
-	if (redis.password) {
-		connOptions.auth_pass = redis.password;
-	}
-	if (redis.hasOwnProperty('database')) {
-		connOptions.db = redis.database;
-	}
-	return _.merge(connOptions, redis.options || {});
-};
-
 connection.connect = async function (options) {
 	return new Promise((resolve, reject) => {
 		options = options || nconf.get('redis');
 		const redis_socket_or_host = options.host;
-		const connOptions = connection.getConnectionOptions(options);
 
 		let cxn;
 		if (redis_socket_or_host && String(redis_socket_or_host).indexOf('/') >= 0) {
-			/* If redis.host contains a path name character, use the unix dom sock connection. ie, /tmp/redis.sock */
-			cxn = redis.createClient(options.host, connOptions);
+			// If redis.host contains a path name character, use the unix dom sock connection. ie, /tmp/redis.sock
+			cxn = new Redis({
+				...options.options,
+				path: redis_socket_or_host,
+				password: options.password,
+				db: options.database,
+			});
 		} else {
-			/* Else, connect over tcp/ip */
-			cxn = redis.createClient(options.port, options.host, connOptions);
+			// Else, connect over tcp/ip
+			cxn = new Redis({
+				...options.options,
+				host: redis_socket_or_host,
+				port: options.port,
+				password: options.password,
+				db: options.database,
+			});
 		}
 
 		const dbIdx = parseInt(options.database, 10);
@@ -44,6 +41,8 @@ connection.connect = async function (options) {
 			reject(err);
 		});
 		cxn.on('ready', () => {
+			// back-compat with node_redis
+			cxn.batch = cxn.pipeline;
 			resolve(cxn);
 		});
 

src/database/redis/hash.js

@@ -111,6 +111,14 @@ module.exports = function (module) {
 			data = [await module.client.async.hgetall(unCachedKeys[0])];
 		}
 
+		// convert empty objects into null for back-compat with node_redis
+		data = data.map((elem) => {
+			if (!Object.keys(elem).length) {
+				return null;
+			}
+			return elem;
+		});
+
 		unCachedKeys.forEach((key, i) => {
 			cachedData[key] = data[i] || null;
 			cache.set(key, cachedData[key]);

src/database/redis/helpers.js

@@ -1,14 +1,17 @@
 'use strict';
 
-const util = require('util');
-
 const helpers = module.exports;
 
 helpers.noop = function () {};
 
 helpers.execBatch = async function (batch) {
-	const proFn = util.promisify(batch.exec).bind(batch);
-	return await proFn();
+	const results = await batch.exec();
+	return results.map(([err, res]) => {
+		if (err) {
+			throw err;
+		}
+		return res;
+	});
 };
 
 helpers.resultsToBool = function (results) {

src/database/redis/sets.js

@@ -29,6 +29,9 @@ module.exports = function (module) {
 		if (!Array.isArray(key)) {
 			key = [key];
 		}
+		if (!value.length) {
+			return;
+		}
 
 		const batch = module.client.batch();
 		key.forEach(k => batch.srem(String(k), value));