diff --git a/src/util/cache/LocalCache.ts b/src/util/cache/LocalCache.ts
new file mode 100644
index 00000000..547899ac
--- /dev/null
+++ b/src/util/cache/LocalCache.ts
@@ -0,0 +1,91 @@
+/*
+ Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
+ Copyright (C) 2023 Fosscord and Fosscord 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/>.
+*/
+/* eslint-disable @typescript-eslint/ban-ts-comment */
+import { BaseEntityWithId, Cache } from "./Cache";
+
+export const cacheTimeout = 1000 * 60 * 5;
+
+export class LocalCache extends Map<string, BaseEntityWithId> implements Cache {
+ last_access = new Map<string, number>();
+
+ constructor() {
+ super();
+
+ setInterval(() => {
+ const now = Date.now();
+ for (const [key, value] of this.last_access) {
+ if (now - value > cacheTimeout) {
+ this.delete(key);
+ this.last_access.delete(key);
+ }
+ }
+ }, cacheTimeout);
+ }
+
+ set(key: string, value: BaseEntityWithId): this {
+ this.last_access.set(key, Date.now());
+ if (this.has(key)) this.update(key, value);
+ return super.set(key, value as never);
+ }
+
+ get(key: string) {
+ const value = super.get(key);
+ if (value) this.last_access.set(key, Date.now());
+ return value;
+ }
+
+ update(id: string, entity: BaseEntityWithId) {
+ const oldEntity = this.get(id);
+ if (!oldEntity) return;
+ for (const key in entity) {
+ // @ts-ignore
+ if (entity[key] === undefined) continue; // @ts-ignore
+ oldEntity[key] = entity[key];
+ }
+ }
+
+ find(options: Record<string, never>): BaseEntityWithId | undefined {
+ if (options.id && Object.keys(options).length === 1) {
+ return this.get(options.id);
+ }
+ for (const entity of this.values()) {
+ if (objectFulfillsQuery(entity, options)) return entity;
+ }
+ }
+
+ filter(options: Record<string, never>): BaseEntityWithId[] {
+ const result = [];
+ for (const entity of this.values()) {
+ if (objectFulfillsQuery(entity, options)) {
+ result.push(entity);
+ }
+ }
+ return result;
+ }
+}
+
+function objectFulfillsQuery(
+ entity: BaseEntityWithId,
+ options: Record<string, never>,
+) {
+ for (const key in options) {
+ // @ts-ignore
+ if (entity[key] !== options[key]) return false;
+ }
+ return true;
+}
|
