perf: make upgrade script faster

src/upgrades/1.12.1/post_upload_sizes.js

@@ -1,24 +1,23 @@
 'use strict';
 
-const async = require('async');
-
 const batch = require('../../batch');
 const posts = require('../../posts');
+const db = require('../../database');
 
 module.exports = {
 	name: 'Calculate image sizes of all uploaded images',
 	timestamp: Date.UTC(2019, 2, 16),
-	method: function (callback) {
+	method: async function () {
 		const { progress } = this;
 
-		batch.processSortedSet('posts:pid', (postData, next) => {
-			async.eachSeries(postData, async (pid) => {
-				const uploads = await posts.uploads.list(pid);
+		await batch.processSortedSet('posts:pid', async (postData) => {
+			const keys = postData.map(p => `post:${p.pid}:uploads`);
+			const uploads = await db.getSortedSetRange(keys, 0, -1);
 			await posts.uploads.saveSize(uploads);
-				progress.incr();
-			}, next);
+			progress.incr(postData.length);
 		}, {
+			batch: 100,
 			progress: progress,
-		}, callback);
+		});
 	},
 };