@indiekit/indiekit/lib/cache.js

The little server that connects your website to the independent web

/**
 * Get cached response value
 * @typedef {import("keyv").Keyv} Keyv
 * @param {Keyv} cache - Application cache (returns `false` if no database)
 * @param {number} ttl - Time to live
 * @param {string} url - URL to fetch and cache (used as key)
 * @returns {Promise<object>} Cached response value
 */
export const getCachedResponse = async (cache, ttl, url) => {
  let cachedResponse = cache && (await cache.get(url));

  if (!cachedResponse) {
    try {
      const response = await fetch(url);

      if (!response.ok) {
        console.error(url, response.statusText);
        return;
      }

      cachedResponse = await response.json();
    } catch (error) {
      console.error(error);
    }

    if (cache) {
      await cache.set(url, cachedResponse, ttl);
    }
  }

  return cachedResponse;
};