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perf: cache leaderboard aggregation result for 5 minutes #535

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perf: cache leaderboard aggregation result for 5 minutes #535

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10 changes: 10 additions & 0 deletions database/account-info/leaderboard.js
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Original file line number Diff line number Diff line change
@@ -1,7 +1,15 @@
import { perTossupData, perBonusData } from '../../database/qbreader/collections.js';
import mergeTwoSortedArrays from '../../server/merge-two-sorted-arrays.js';

const CACHE_TTL = 5 * 60 * 1000; // 5 minutes
let cachedOverall = null;
let cachedAt = 0;

export default async function leaderboard (limit) {
if (cachedOverall && Date.now() - cachedAt < CACHE_TTL) {
return cachedOverall.slice(0, limit);
}

const tossupLeaderboard = await helper('tossup');
const bonusLeaderboard = await helper('bonus');
const overall = mergeTwoSortedArrays(
Expand All @@ -12,6 +20,8 @@ export default async function leaderboard (limit) {
);
// sort from most to least
overall.sort((a, b) => b.total - a.total);
cachedOverall = overall;
cachedAt = Date.now();
return overall.slice(0, limit);
}

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