perf(api): convert handler for 'total stories+authors' endpoint to a cachedEventHandler

server/api/totals.get.ts

@@ -1,10 +1,47 @@
 import mongoose from "mongoose";
 import { Story } from "~/models/stories";
+import { User } from "~/models/user";
 
-export default eventHandler(async (event) => {
-	let aa = mongoose.connection.db.collection("z_index_totAuthors");
-	let totalStories = await Story.countDocuments({ "chapters.hidden": false });
-	let totalAuthors = await aa.countDocuments();
+let authorSingleton: {
+	lastRefreshed: number;
+	data: {
+		username: string;
+		_id: number;
+		numStories: number;
+	}[];
+} = {
+	data: [],
+	lastRefreshed: Date.now(),
+};
 
-	return { stories: totalStories, authors: totalAuthors };
-});
+const threshold = 60 * 60 * 1000;
+
+export default cachedEventHandler(
+	async (event) => {
+		let aa = mongoose.connection.db.collection("z_index_totAuthors");
+		let totalStories = await Story.countDocuments({ "chapters.hidden": false });
+		if (
+			!authorSingleton.data.length ||
+			Date.now() - authorSingleton.lastRefreshed >= threshold
+		) {
+			authorSingleton.data = await User.aggregate([
+				{ $project: { username: true, _id: true } },
+				{
+					$lookup: {
+						from: "stories",
+						localField: "_id",
+						foreignField: "author",
+						as: "stories",
+					},
+				},
+				{ $set: { numStories: { $size: "$stories" } } },
+				{ $unset: "stories" },
+				{ $match: { numStories: { $gte: 1 } } },
+			]);
+		}
+		let totalAuthors = authorSingleton.data.length;
+
+		return { stories: totalStories, authors: totalAuthors };
+	},
+	{ maxAge: 60 * 60 * 24 },
+);