feat: convert search controller to async/await

src/controllers/search.js

@@ -1,32 +1,27 @@
 
 'use strict';
 
-var async = require('async');
-var validator = require('validator');
+const validator = require('validator');
 
-var meta = require('../meta');
-var plugins = require('../plugins');
-var search = require('../search');
-var categories = require('../categories');
-var pagination = require('../pagination');
-var privileges = require('../privileges');
-var helpers = require('./helpers');
+const meta = require('../meta');
+const plugins = require('../plugins');
+const search = require('../search');
+const categories = require('../categories');
+const pagination = require('../pagination');
+const privileges = require('../privileges');
+const helpers = require('./helpers');
 
-var searchController = module.exports;
+const searchController = module.exports;
 
-searchController.search = function (req, res, next) {
+searchController.search = async function (req, res, next) {
 	if (!plugins.hasListeners('filter:search.query')) {
 		return next();
 	}
-	var page = Math.max(1, parseInt(req.query.page, 10)) || 1;
+	const page = Math.max(1, parseInt(req.query.page, 10)) || 1;
 
 	const searchOnly = parseInt(req.query.searchOnly, 10) === 1;
 
-	async.waterfall([
-		function (next) {
-			privileges.global.can('search:content', req.uid, next);
-		},
-		function (allowed, next) {
+	const allowed = await privileges.global.can('search:content', req.uid);
 	if (!allowed) {
 		return helpers.notAllowed(req, res);
 	}
@@ -38,7 +33,7 @@ searchController.search = function (req, res, next) {
 		req.query.hasTags = [req.query.hasTags];
 	}
 
-			var data = {
+	const data = {
 		query: req.query.term,
 		searchIn: req.query.in || 'posts',
 		matchWords: req.query.matchWords || 'all',
@@ -58,13 +53,10 @@ searchController.search = function (req, res, next) {
 		qs: req.query,
 	};
 
-			async.parallel({
-				categories: async.apply(buildCategories, req.uid, searchOnly),
-				search: async.apply(search.search, data),
-			}, next);
-		},
-		function (results) {
-			var searchData = results.search;
+	const [searchData, categoriesData] = await Promise.all([
+		search.search(data),
+		buildCategories(req.uid, searchOnly),
+	]);
 
 	searchData.pagination = pagination.create(page, searchData.pageCount, req.query);
 	searchData.multiplePages = searchData.pageCount > 1;
@@ -75,14 +67,6 @@ searchController.search = function (req, res, next) {
 		return res.json(searchData);
 	}
 
-			results.categories = results.categories.filter(category => category && !category.link);
-
-			var categoriesData = [
-				{ value: 'all', text: '[[unread:all_categories]]' },
-				{ value: 'watched', text: '[[category:watched-categories]]' },
-			].concat(results.categories);
-
-
 	searchData.categories = categoriesData;
 	searchData.categoriesCount = Math.max(10, Math.min(20, categoriesData.length));
 	searchData.breadcrumbs = helpers.buildBreadcrumbs([{ text: '[[global:search]]' }]);
@@ -94,13 +78,16 @@ searchController.search = function (req, res, next) {
 
 	searchData.searchDefaultSortBy = meta.config.searchDefaultSortBy || '';
 	res.render('search', searchData);
-		},
-	], next);
 };
 
-function buildCategories(uid, searchOnly, callback) {
+async function buildCategories(uid, searchOnly) {
 	if (searchOnly) {
-		return setImmediate(callback, null, []);
+		return [];
 	}
-	categories.buildForSelect(uid, 'read', callback);
+	let categoriesData = await categories.buildForSelect(uid, 'read');
+	categoriesData = categoriesData.filter(category => category && !category.link);
+	return [
+		{ value: 'all', text: '[[unread:all_categories]]' },
+		{ value: 'watched', text: '[[category:watched-categories]]' },
+	].concat(categoriesData);
 }