redis.js

import { redis } from './redis';

const fetch = async (key, fetcher, expires) => {
  const existing = await get(key);
  // If the key is already in redis, return it
  if (existing !== null) return existing;
  // Otherwise, set it and return the value
  else set(key, fetcher, expires);
};

const get = async (key) => {
  const value = await redis.get(key);
  // If the key is not in redis, return null
  if (value === null) return null;
  // Otherwise, return the value
  return JSON.parse(value);
};

const set = async (key, fetcher, expires) => {
  const value = await fetcher();
  // If the value is null, return
  await redis.set(key, JSON.stringify(value), 'EX', expires);
  // Otherwise, return the value
  return value;
};

//
const del = async (key) => await redis.del(key);

export default { fetch, del };