共计 3003 个字符，预计需要花费 8 分钟才能阅读完成。
依赖配置
cnpm install egg-redis –save
config/plugin.js
exports.redis = {
enable: false,
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
设置 redis
service
app/service/cache.js
‘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
