nodejs使用redis封裝緩存的方法

const redis = require('redis');

// cache.js
const redis = require('redis');
const config = require('config');
const logger = require('winston');
const redisObj = {
 client: null,
 connect: function () {
 this.client = redis.createClient(config.redis);
 this.client.on('error', function (err) {
 logger.error('redisCache Error ' + err);
 });
 this.client.on('ready', function () {
 logger.info('redisCache connection succeed');
 });
 },
 init: function () {
 this.connect(); // 創(chuàng)建連接
 const instance = this.client;
 // 主要重寫了一下三個方法?？梢愿鶕?jù)需要定義。
 const get = instance.get;
 const set = instance.set;
 const setex = instance.setex;
 instance.set = function (key, value, callback) {
 if (value ！== undefined) {
 set.call(instance, key, JSON.stringify(value), callback);
 }
 };
 instance.get = function (key, callback) {
 get.call(instance, key, (err, val) => {
 if (err) {
 logger.warn('redis.get: ', key, err);
 }
 callback(null, JSON.parse(val));
 });
 };
 // 可以不用傳遞expires參數(shù)。在config文件里進(jìn)行配置。
 instance.setex = function (key, value, callback) {
 if (value !== undefined) {
 setex.call(instance, key, config.cache.maxAge, JSON.stringify(value), callback);
 }
 };
 return instance;
 },
};
// 返回的是一個redis.client的實例
module.exports = redisObj.init();

const cache = require('./cache');
cache.get(key, (err, val) => {
 if (val) {
 // do something
 } else {
 // do otherthing
 }
});
cache.set(key, val, (err, res) => {
 // do something
});
cache.setex(key, val, (err, res) => {
 // do something
})