const db = require("../../utils/redis"); function createCache(keyPrefix) { function createKey(key) { return keyPrefix + "-" + key; } function set(key, value, expiry, callback) { db.setex(createKey(key), expiry, JSON.stringify(value), callback); } function get(key, callback) { db.get(createKey(key), function(error, value) { callback(error, value && JSON.parse(value)); }); } function del(key, callback) { db.del(createKey(key), callback); } return { set, get, del }; } module.exports = createCache;