第9节nodejs09手写ts装饰器项目架构

ts项⽬架 搭建NodeTS开发环境基于装饰器的RouterValidationpackage.jsonnpminitnpmitypescriptts-node-devtslint@types/node启动"scripts":"scripts":"start":"ts-node-dev./src/index.ts-Ptsconfig.json--no-cache","build":"tsc-Ptsconfig.json&&node./dist/index.js","tslint":"tslint--fix-ptsconfig.json"}加⼊{{"compilerOptions":{"outDir":"target":"module""commonjs",//组织代码⽅式"sourceMap":true,"moduleResolution":"node",//模块解决策略"experimentalDecorators":true,//开启装饰器定义"allowSyntheticDefaultImports"true允许es6⽅式import"lib":"typeRoots":"include":}创建⼊⼝⽂件npmnpmikoakoa-statickoa-bodykoa-xtime编写基础代import*import*asKoafromimport*asbodifyfrom'koa-import*asservefrom'koa-static';import*astimingfrom'koa-constapp=newapp.use(serve(`${multipart:使⽤⾮严格模式，解析delete请求的请求strict:app.use((ctx:Koa.Context)=>{ctx.body=' app.listen(3000,()=>{npm创建路由import*import*asKoafromconstusers=[{name:'tom',age:20},{name:'tom',age:20}];exportdefaultclassUser{publiclist(ctx:{ctx.body={ok:1,data:users};publicadd(ctx:{;ctx.body={ok:1}}知识点补充：装饰器的编写，以@gt('/users')functionfunctionget(path)returnfunction(target,property,descriptor)}另外需解决两个问路由发路由路由发现及，创建./utils/route-importimport*asglobfrom'glob';import*asKoafrom'koa';import*asKoaRouterfrom'koa-typeHTTPMethod='get'|'put'|'del'|'post'|'patch';typeLoadOptions={*路由⽂件扩展名，默认值是extname?:typeRouteOptions=prefix?:middlewares?:constrouter=newexportconstget=(path:string,options?:RouteOptions){return(target,property,descriptor)=>consturl=options&&options.prefix?options.prefix+pathrouter['get'](url,}}exportconstpost=(path:string,options?:RouteOptions){return(target,property,descriptor)=>consturl=options&&options.prefix?options.prefix+pathrouter['post'](url,}}解决getpostputdelete⽅⽤逻辑constconstrouter=newconstmethod=method=>(path:string,options?:RouteOptions){return(target,property,descriptor)=>consturl=options&&options.prefix?options.prefix+pathrouter[method](url,}}exportconstget=method('get')exportconstpost=method('post')routerconstconstrouter=newconstdecorate=(method:HTTPMethod,path:string,options:RouteOptions{},router:KoaRouter)=>return(target,property:string)=>consturl=options.prefix?options.prefix+path:pathrouter[method](url,target[property])}}constmethod=method=>(path:string,options?:RouteOptions)=>decorate(method,path,options,router)exportconstget=exportconstpost=importimport*asglobfrom'glob';import*asKoafrom'koa';import*asKoaRouterfrom'koa-typeHTTPMethod='get'|'put'|'del'|'post'|'patch';typeLoadOptions={路由⽂件扩展名，默认值是extname?:typeRouteOptions=适⽤于某个请求⽐较特殊，需要单独制定前缀的prefix?:给当前路由添加⼀个或多个中middlewares?:constrouter=newconstdecorate=(method:HTTPMethod,path:string,options:RouteOptions{},router:KoaRouter)=>return(target,property:string)=>consturl=options.prefix?options.prefix+path:pathrouter[method](url,target[property])}}constmethod=method=>(path:string,options?:RouteOptions)=>decorate(method,path,options,router)exportconstget=exportexportconstpost=method('post')exportconstput=method('put')exportconstdel=method('del')exportconstpatch=exportconstload=(folder:string,options:LoadOptions={}):=>constextname=options.extname||'.{js,ts}'`./**/*${extname}`)).forEach((item)=>require(item))returnrouter}使importimport{get,post}fromimportimport{load}from'./utils/decors';import{resolve}from'path'constrouter=load(resolve(dirname,'./routes'));////异步校验constapi=findByName(name)returnnewPromise((resolve,reject){setTimeout(()=>if(name===}else}},}}exportdefaultclassUser添加中间件选{middlewares:asyncfunctionvalidation(ctx:Koa.Context,next:()=>Promise<any>){constname=if(!name){throw"请输⼊⽤户名}tryawaitawait}catch{throw}}]publicasyncadd(ctx:Koa.Context)}更新exportexportconstload=function(prefix:string,folder:string,options:LoadOptions={}):KoaRouter{//route=function(method:HTTPMethod,path:string,options:RouteOptions{})returnfunction(target,property:string,descriptor)添加中间件数constmiddlewares=若设置了中间件选项则加⼊到中间件if{}添加路由处理consturl=(options.prefix||prefix)+//router[method](url,target[property]);router[method](url,...middlewares);////return类级别路由使⽤asyncfunctionguard(ctx:Koa.Context,next:()Promise<any>){console.log('guard',if(ctx.header.token){awaitnext();}elsethrow }}exportdefaultclassUser////增加中间装饰exportconstmiddlewares=functionmiddlewares(middlewares:Koa.Middleware[]){return{totype.middlewares=//修改load⽅exportconstload=function(prefix:string,folder:string,options:LoadOptions={}):KoaRouter{route=function(method:HTTPMethod,path:string,options:RouteOptions={}){returnfunction(target,property:string,descriptor)//晚⼀拍执⾏路 ：因为需要等类装饰器执⾏完process.nextTick((){letmws=获取class上定义的中间if{}//returnnpmiSsequelizesequelize-typescriptreflect-metadata初始化importimport{Sequelize}from'sequelize-constdatabase=newSequelize({modelPaths:[`${ :创建模////import{Table,Column,Model,DataType}from'sequelize-@Table({modelNam