Cachex NPM | npm.io

cachex

A cache hook

Installation

npm i cachex --save

Usage

If you have origin SQL query, it is db.js:

async function getRows() {
  // mock a slow query
  return await db.query(sql);
}

Before use cachex, you must provider an cache storage, it can be redis or memcached or memory.

var inMemory = {};

var store = {
  get: async function (key) {
    return inMemory[key];
  },
  setex: async function (key, value, expire) {
    inMemory[key] = value;
    setTimeout(function () {
      delete inMemory[key];
    }, expire);
  }
};

The storage object must have get/setex method.

// db_with_cache.js
import cachex from 'cachex';
import db from './db.js';

// cache result 10s
export const getRows = cachex(store, 'db', 'getRows', db.getRows, 10);

Running go:

import dbx from './db_with_cache.js';
// from db
await dbx.getRows();

// from cache
await dbx.getRows();
// ..10s..pass..
// from db
await dbx.getRows();