@naturalcycles/db-lib/dist/kv/commonKeyValueDaoMemoCache.js

Lowest Common Denominator API to supported Databases

import { localTime } from '@naturalcycles/js-lib/datetime/localTime.js';
import { MISS } from '@naturalcycles/js-lib/types';
/**
 * AsyncMemoCache implementation, backed by CommonKeyValueDao.
 *
 * Does NOT support persisting Errors, skips them instead.
 *
 * Also, does not support .clear(), as it's more dangerous than useful to actually
 * clear the whole table/cache.
 */
export class CommonKeyValueDaoMemoCache {
    cfg;
    constructor(cfg) {
        this.cfg = cfg;
    }
    async get(k) {
        return (await this.cfg.dao.getById(k)) || MISS;
    }
    async set(k, v) {
        const opt = this.cfg.ttl
            ? { expireAt: (localTime.nowUnix() + this.cfg.ttl) }
            : undefined;
        await this.cfg.dao.save(k, v, opt);
    }
    async clear() {
        throw new Error('CommonKeyValueDaoMemoCache.clear is not supported, because cache is expected to be persistent');
    }
}