cache statistics

projects/backend/src/service/app.service.ts

@@ -4,24 +4,35 @@ import { ScoreSaberScoreModel } from "@ssr/common/model/score/impl/scoresaber-sc
 import { AdditionalScoreDataModel } from "@ssr/common/model/additional-score-data/additional-score-data";
 import { BeatSaverMapModel } from "@ssr/common/model/beatsaver/map";
 import { ScoreSaberLeaderboardModel } from "@ssr/common/model/leaderboard/impl/scoresaber-leaderboard";
+import { SSRCache } from "@ssr/common/cache";
+
+const statisticsCache = new SSRCache({
+  ttl: 120 * 1000, // 2 minutes
+});
 
 export class AppService {
   /**
    * Gets the app statistics.
    */
   public static async getAppStatistics(): Promise<AppStatistics> {
+    if (statisticsCache.has("app-statistics")) {
+      return statisticsCache.get<AppStatistics>("app-statistics")!;
+    }
+
     const trackedPlayers = await PlayerModel.countDocuments();
     const trackedScores = await ScoreSaberScoreModel.countDocuments();
     const additionalScoresData = await AdditionalScoreDataModel.countDocuments();
     const cachedBeatSaverMaps = await BeatSaverMapModel.countDocuments();
     const cachedScoreSaberLeaderboards = await ScoreSaberLeaderboardModel.countDocuments();
 
-    return {
+    const response = {
       trackedPlayers,
       trackedScores,
       additionalScoresData,
       cachedBeatSaverMaps,
       cachedScoreSaberLeaderboards,
     };
+    statisticsCache.set("app-statistics", response);
+    return response;
   }
 }

projects/common/src/cache.ts

@@ -1,6 +1,6 @@
 type CacheOptions = {
   /**
-   * The time the cached object will be valid for
+   * The time (in ms) the cached object will be valid for
    */
   ttl?: number;