@klevu/core/dist/mjs/store/klevuFetchCache.js

Typescript SDK that simplifies development on Klevu backend. Klevu provides advanced AI-powered search and discovery solutions for online retailers.

import { KlevuConfig } from "../config.js";
import { isBrowser } from "../utils/isBrowser.js";
/**
 * @ignore
 */
export class KlevuFetchCache {
    constructor() {
        this._cache = new Map();
        this._timestamp = new Map();
    }
    /**
     * checks if cache has value and returns it
     *
     * @param key
     * @param force For testing purposes
     * @returns undefined if not cached
     */
    check(key, force = false) {
        // never cache on node server
        if (!force && !isBrowser()) {
            return undefined;
        }
        const hash = this.hash(key);
        if (!this._cache.has(hash)) {
            return undefined;
        }
        const cached = this._cache.get(hash);
        const ts = this._timestamp.get(hash);
        if (cached && ts) {
            if (new Date().getTime() < ts) {
                return JSON.parse(cached);
            }
            this._cache.delete(hash);
            this._timestamp.delete(hash);
        }
        return undefined;
    }
    cache(key, data, timetocache = KlevuConfig.getDefault().cacheMaxTTL) {
        const hash = this.hash(key);
        this._cache.set(hash, JSON.stringify(data));
        this._timestamp.set(hash, new Date().getTime() + timetocache);
    }
    hash(input) {
        return Array.from(JSON.stringify(input)).reduce((s, c) => (Math.imul(31, s) + c.charCodeAt(0)) | 0, 0);
    }
}