Add SingletonCache, implement caching for tenor
1 files changed, 53 insertions, 0 deletions
diff --git a/src/extensions/SingletonCache.ts b/src/extensions/SingletonCache.ts
new file mode 100644
index 000000000..7f9f7895c
--- /dev/null
+++ b/src/extensions/SingletonCache.ts
@@ -0,0 +1,53 @@
+/*
+ Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
+ Copyright (C) 2026 Spacebar and Spacebar Contributors
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { TimeSpan } from "./Timespan";
+import { sleep } from "./index";
+
+export class SingletonCache<T> {
+ private expiry: TimeSpan;
+ private lastUpdated: Date = new Date(0);
+ private isLocked: boolean = false;
+ private cachedValue: T;
+
+ constructor(expiry: TimeSpan) {
+ this.expiry = expiry;
+ }
+
+ async getOrUpdate(factory: () => Promise<T>): Promise<T> {
+ if (new TimeSpan(this.lastUpdated.getTime(), Date.now()).totalMillis < this.expiry.totalMillis) return this.cachedValue;
+
+ if (this.isLocked) {
+ // avoid running the factory twice (async)
+ while (this.isLocked) await sleep(50);
+ return this.cachedValue;
+ }
+
+ this.isLocked = true;
+ try {
+ const result = await factory();
+ this.cachedValue = result;
+ return result;
+ } catch (e) {
+ console.log(`[SingletonCache] Factory method failed, returning stale value:`, e);
+ return this.cachedValue;
+ } finally {
+ this.isLocked = false;
+ }
+ }
+}
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