egg之redis在项目中的实际应用

依赖配置

cnpm install egg-redis --save

config/plugin.js

enable: true启用redis

exports.redis = {
  enable: true,
  package: 'egg-redis',
};

config/config.default.js

  config.redis = {
    client: {
      port: 6379,          // Redis port
      host: '127.0.0.1',   // Redis host
      password: '',
      db: 0
    }
  }

不用redis之前的请求时间

图片.png

设置redis

service

app/service/cache.js

if(this.app.redis)判断是否有启用redis

'use strict';

const Service = require('egg').Service;

class CacheService extends Service {
  async set(key,value,seconds) {
    value = JSON.stringify(value);
    if(this.app.redis){
        if(!seconds){
            await this.app.redis.set(key,value);
        }else{
            await this.app.redis.set(key,value,'EX',seconds)
        }
    }
  }

  async get(key){
      if(this.app.redis){
          var data = await this.app.redis.get(key);
          if(!data) return;
          return JSON.parse(data)
      }
  }
}

module.exports = CacheService;

controller

app/controller/default/index.js
如果没有设置redis缓存，就去请求数据,再设置缓存

    var topNav = await this.ctx.service.cache.get('index_topNav');
    if(!topNav){
      topNav=await this.ctx.model.Nav.find({"position":1});
      await this.ctx.service.cache.set('index_topNav',topNav,60*60);
    }

全部代码

'use strict';

const Controller = require('egg').Controller;

class IndexController extends Controller {
  async index() {

    console.time('index_time')
    //获取顶部导航的数据
    var topNav = await this.ctx.service.cache.get('index_topNav');
    if(!topNav){
      topNav=await this.ctx.model.Nav.find({"position":1});
      await this.ctx.service.cache.set('index_topNav',topNav,60*60);
    }

   //轮播图

   var focus=await this.ctx.service.cache.get('index_focus');
   if(!focus){
    focus=await this.ctx.model.Focus.find({"type":1});
    await this.ctx.service.cache.set('index_focus',focus,60*60);

   }

   //商品分类
   var goodsCate=await this.ctx.service.cache.get('index_goodsCate');
   if(!goodsCate){
      goodsCate=await this.ctx.model.GoodsCate.aggregate([

        {
          $lookup:{
            from:'goods_cate',
            localField:'_id',
            foreignField:'pid',
            as:'items'      
          }      
      },
      {
          $match:{
            "pid":'0'
          }
      }

    ])
    await this.ctx.service.cache.set('index_goodsCate',goodsCate,60*60);
   }

    // console.log(topNav);
    var middleNav=await this.ctx.service.cache.get('index_middleNav'); 
    if(!middleNav){
      middleNav=await this.ctx.model.Nav.find({"position":2});
      middleNav=JSON.parse(JSON.stringify(middleNav));  //1、不可扩展对象
      for(var i=0;i<middleNav.length;i++){     
        if(middleNav[i].relation){
              //数据库查找relation对应的商品            
              try{
                  var tempArr=middleNav[i].relation.replace(/，/g,',').split(',');
                  var tempRelationIds=[];
                  tempArr.forEach((value)=>{
                    tempRelationIds.push({
                      "_id":this.app.mongoose.Types.ObjectId(value)
                    })
                  })
                  var relationGoods=await this.ctx.model.Goods.find({
                    $or:tempRelationIds
                  },'title goods_img');

                middleNav[i].subGoods=relationGoods;

              }catch(err){   //2、如果用户输入了错误的ObjectID（商品id）

                middleNav[i].subGoods=[];
              }
        }else{

            middleNav[i].subGoods=[];
        }
      }

      await this.ctx.service.cache.set('index_middleNav',middleNav,60*60);

    }

    // console.log(JSON.stringify(middleNav))

    var shoujiResult=await this.ctx.service.cache.get('index_shoujiResult'); 

    if(!shoujiResult){
      shoujiResult=await this.service.goods.get_category_recommend_goods('5bbf058f9079450a903cb77b','best',8);
      await this.ctx.service.cache.set('index_shoujiResult',shoujiResult,60*60);

    }

    console.timeEnd('index_time')
    await this.ctx.render('default/index',{
      topNav:topNav,
      focus:focus,
      goodsCate:goodsCate,
      middleNav:middleNav,
      shoujiResult:shoujiResult
    });

  }
}

module.exports = IndexController;

设置redis缓存后的时间

图片.png