# Endpoint
> service的调用层，还可以添加各种中间件，验证，限流，日志。
## 样例
```go
// 定义请求格式
type UserRequest struct {
Uid int `json:"uid"`
Method string
Token string
}
// 定义返回格式
type UserResponse struct {
Result string `json:"result"`
}
func GenUserEndpoint(userService IUserService) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
r := request.(UserRequest)
fmt.Println("当前用户名是：", ctx.Value("LoginUser"))
result := "nothing"
if r.Method == "GET" {
// 添加端口是为了测试负载均衡
result = userService.GetName(r.Uid) + strconv.Itoa(util.ServicePort) // 获取服务端口
} else if r.Method == "DELETE" {
err = userService.DelUser(r.Uid)
if err != nil {
result = err.Error()
} else {
result = "success"
}
}
return UserResponse{Result: result}, nil
}
}
```
## 添加中间件
> 添加日志中间件
```
// 日志中间件
func UserServiceLogMiddleware(logger log.Logger) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
r := request.(UserRequest)
logger.Log("method", "GET", "event", "xxx", "userid", r.Uid)
return next(ctx, request)
}
}
}
// mian层调用
UserServiceLogMiddleware(logger)(GenUserEndpoint(user))
```
