node.js express.js sequelize redis cache

http://liu-xin.me/2017/03/24/%E8%AE%A9%E5%86%99%E5%85%A5%E6%95%B0%E6%8D%AE%E5%BA%93%E7%9A%84%E6%95%B0%E6%8D%AE%E8%87%AA%E5%8A%A8%E5%86%99%E5%85%A5%E7%BC%93%E5%AD%98/

const to = require('await-to-js').default;
const Redis = require('ioredis');
const redis = new Redis(ooxxooxx);

function Cache() {}
Cache.get = async function(key) {
  const [err, res] = await to(redis.get(key));
  if (err) {console.error('REDIS::Cache::get]', err); return null;}
  return JSON.parse(res);
};

Cache.set = async function(key, value) {
  value = JSON.stringify(value);
  const [err] = await to(redis.set(key, value));
  if (err) {console.error('REDIS::Cache::set]', err); }
};


//
// sequelize.query
//
async function CacheSequelizeQuery(sequelize, sql, params, redisKey) {
  const cacheData = await Cache.get(redisKey);
  if (cacheData) return cacheData; // not empty return cache data

  const [err, lists] = await to(sequelize.query(sql, params));
  if (err) throw err;

  if (lists) await Cache.set(redisKey, lists); // not empty set cache data
  return lists;
}


//
// findOneCache
//
Sequelize.Model.findOneCache = async function() {
  let redisKey;
  for (const parms of Object.values(arguments)) {
    if (parms.where) redisKey = [this.name, JSON.stringify(parms.where)].join(':');
  }
  const cacheValue = await Cache.get(redisKey);
  if (cacheValue) return JSON.parse(cacheValue);

  const result = await Sequelize.Model.findOne.apply(this, arguments);
  Cache.set(redisKey, JSON.stringify(result));
  return result;
};

node.js redis special delete del

https://github.com/luin/ioredis

const Redis = require('ioredis');
const redis = new Redis();

const delScript = `
  local all_keys = {};
  local keys = {};
  local done = false;
  local cursor = "0"
  repeat
      local result = redis.call("SCAN", cursor, "match", KEYS[1], "count", KEYS[2])
      cursor = result[1];
      keys = result[2];
      for i, key in ipairs(keys) do
          all_keys[#all_keys+1] = key;
      end
      if cursor == "0" then
          done = true;
      end
  until done
  for i, key in ipairs(all_keys) do
      redis.call("DEL", key);
  end
  return true;
`;

redis.defineCommand('del', {
  numberOfKeys: 2,
  lua: delScript
});

redis.del('login:202007*', 10000, function(error, result) {
  console.log('error: ', error);
  console.log('result: ', result);
});

javascript functions parm default value

https://stackoverflow.com/questions/6600868/set-default-value-of-javascript-object-attributes

// default num: 0, unit: 'pics'
function items(op) {
  const { num, unit } = Object.assign({}, { num: 0, unit: 'pics'}, op);
}