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/*
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;
}
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