1.基础入门

package Services
type IUserService interface {
    GetName(userid int) string
}
type UserService struct{}
func (this UserService) GetName(userid int) string {
    if userid == 101 {
        return "jerry"
    }
    return "guest"
}

package Services

import (
    "context"
    "github.com/go-kit/kit/endpoint"
)

type UserRequest struct { //封装User请求结构体
    Uid int `json:"uid"`
}

type UserResponse struct {
    Result string `json:"result"`
}

func GenUserEnPoint(userService IUserService) endpoint.Endpoint {
    return func(ctx context.Context, request interface{}) (response interface{}, err error) {
        r := request.(UserRequest)           //通过类型断言获取请求结构体
        result := userService.GetName(r.Uid) //
        return UserResponse{Result: result}, nil
    }
}

package Services

import (
    "context"
    "encoding/json"
    "errors"
    "net/http"
    "strconv"
)

func DecodeUserRequest(c context.Context, r *http.Request) (interface{}, error) { //这个函数决定了使用哪个request结构体来请求
    if r.URL.Query().Get("uid") != "" {
        uid, _ := strconv.Atoi(r.URL.Query().Get("uid"))
        return UserRequest{Uid: uid}, nil
    }
    return nil,errors.New("参数错误")/
}

func EncodeUserResponse(ctx context.Context,w http.ResponseWriter,response interface{}) error{
    w.Header().Set("Content-type","application/json") //设置响应格式为json，这样客户端接收到的值就是json，就是把我们设置的UserResponse给json化了

    return json.NewEncoder(w).Encode(response)//判断响应格式是否正确
}