Fast GM Cache System

Lightweight cache with TTL using GM_setValue

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(У мене вже є менеджер скриптів, дайте мені встановити його!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Fast GM Cache System
// @namespace    fast.cache.system
// @version      1.0
// @description  Lightweight cache with TTL using GM_setValue
// @match        *://*/*
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_deleteValue
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    const CACHE_PREFIX = "fastcache_";

    const Cache = {

        // 📦 Сохранить значение с временем жизни (в секундах)
        set(key, value, ttlSeconds = 300) {
            const data = {
                value: value,
                expiry: Date.now() + ttlSeconds * 1000
            };
            GM_setValue(CACHE_PREFIX + key, JSON.stringify(data));
        },

        // 📥 Получить значение (null если просрочено)
        get(key) {
            const raw = GM_getValue(CACHE_PREFIX + key, null);
            if (!raw) return null;

            try {
                const data = JSON.parse(raw);

                if (Date.now() > data.expiry) {
                    GM_deleteValue(CACHE_PREFIX + key);
                    return null;
                }

                return data.value;

            } catch {
                GM_deleteValue(CACHE_PREFIX + key);
                return null;
            }
        },

        // 🗑 Удалить вручную
        delete(key) {
            GM_deleteValue(CACHE_PREFIX + key);
        },

        // 🧹 Очистить всё
        clearAll() {
            const keys = Object.keys(localStorage);
            keys.forEach(k => {
                if (k.startsWith(CACHE_PREFIX)) {
                    GM_deleteValue(k);
                }
            });
        }
    };

    // ====== ПРИМЕР ИСПОЛЬЗОВАНИЯ ======

    const cached = Cache.get("userData");

    if (cached) {
        console.log("Из кеша:", cached);
    } else {
        console.log("Создаём новые данные");

        const newData = {
            id: 123,
            name: "FastUser"
        };

        Cache.set("userData", newData, 600); // 10 минут
    }

})();