Encapsulated cache class implemented as a cache through redis in nodejs

This article mainly introduces the encapsulated cache class implemented by nodejs using redis as the cache medium. It involves the operation skills related to nodejs operating redis for cache settings. Friends in need can refer to it

The examples in this article describe the use of nodejs Redis is an encapsulated cache class implemented as a cache medium. Share it with everyone for your reference, the details are as follows:

Previously, redis was used as the cache medium under node, and redis was encapsulated with a layer of packaging.

First: Install the npm package redis

const redis = require('redis');

Second: Encapsulation

// 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(); // 创建连接
    const instance = this.client;
    // 主要重写了一下三个方法。可以根据需要定义。
    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));
      });
    };
    // 可以不用传递expires参数。在config文件里进行配置。
    instance.setex = function (key, value, callback) {
      if (value !== undefined) {
        setex.call(instance, key, config.cache.maxAge, JSON.stringify(value), callback);
      }
    };
    return instance;
  },
};
// 返回的是一个redis.client的实例
module.exports = redisObj.init();

How to use

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
})

The above is what I compiled for everyone, I hope It will be helpful to everyone in the future.

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