go从0到1项目实战体系三十一：演示案例代码优化

(1). BsyErp\Contract\main.go:

func main () {{bookResponse := Services.CreateBookResponse()bookServer := &Services.BookService{}bookListHandler := Lib.RegisterHandler(Services.CreateBookListRequest(),Services.BookListEndPoint(bookServer), // 将公共的提到上面去bookResponse,)bookDetailHandler := Lib.RegisterHandler(Services.CreateBookDetailRequest(),Services.BookDetailEndPoint(bookServer),bookResponse,)// 获取book列表v1.Handle(Init.HTTP_METHOD_GET, "/books", bookListHandler)// 获取book详情v1.Handle(Init.HTTP_METHOD_GET, "/book/:id", bookDetailHandler)}router.Run(Init.SERVER_ADDRESS)
}注:
①. 下面(6)中如果Response方法优化了,这里可以优化为:bookResponse := Services.CreateBookResponse(),再将两个Response方法用变量替换.

(3). bookModel(BsyErp\Contract\Models\Books.go):

package Models
// 单实体
type Books struct{BookID int `gorm:"column:book_id;AUTO_INCREMENT;PRIMARY_KEY"`BookName string `gorm:"column:book_name;type:varchar(50)"`BookIntr string `gorm:"column:book_intr;type:text"`BookPrice float64 `gorm:"column:book_price;type:decimal"`BookKind int `gorm:"column:book_kind;type:int"`
}
// 列表
type BooksList []*Books注:
①. 属性名有规范,字段名就不一定有规范.

(1). BsyErp\Contract\App\Services\BookEndpoint.go:

type BookListResponse struct { // 响应参数Result *Models.BooksList `json:"ResultData"`
}
type BookDetailResponse struct {Result *Models.Books `json:"ResultData"`
}注:
①. 上面两个response如果都是返回{Result: xxx},可以优化:type BookResponse struct {Result interface{} `json:"ResultData"`}

(5). BsyErp\Contract\App\Services\BookService.go:

package Services
import ("Contract.bsybx.com/App/Lib""Contract.bsybx.com/Models""context"
)
// v1/books?page=1&size=1
type BookListRequest struct {Page int  `form:"page"`Size int `form:"size"`
}
type BookListResponse struct {Result *Models.BooksList `json:"ResultData"`
}
// v1/book/12
type BookDetailRequest struct {// max可以做预估判断BookID int `uri:"id" binding:"required,gt=0,max=1000000"`
}
type BookDetailResponse struct {Result *Models.Books `json:"ResultData"`
}
func BookListEndPoint(book *BookService)  Lib.Endpoint {return func(ctx context.Context, request interface{}) (response interface{}, err error) {req := request.(*BookListRequest)return &BookListResponse{Result:book.BookList(req)}, nil}
}
func BookDetailEndPoint(book *BookService) Lib.Endpoint {return func(ctx context.Context, request interface{}) (interface{}, error) {req := request.(*BookDetailRequest)return &BookDetailResponse{Result:book.BookDetail(req)}, nil}
}

(6). BsyErp\Contract\App\Services\BookTransport.go:

package Services
import ("Contract.bsybx.com/App/Lib""fmt""github.com/gin-gonic/gin"
)
func CreateBookListRequest() Lib.EncodeRequestFunc {return func(context *gin.Context) (i interface{}, e error) {req := &BookListRequest{}err := context.BindQuery(req)   // 和框架有关系了,获取一个get参数，并且绑定到BookListRequest上，会去寻找这个BookListRequest struct中是否有size。如果有绑定，否则出错。fmt.Println(req)if err != nil{return nil, err}return req, nil}
}
func CreateBookListResponse() Lib.DecodeResponseFunc  {return func(context *gin.Context, i interface{}) error {res := i.(*BookListResponse)       // 取出BookListResponse,后再断言context.JSON(200, res)return nil}
}
func CreateBookDetailRequest() Lib.EncodeRequestFunc {return func(context *gin.Context) (interface{}, error) {req := &BookDetailRequest{}// 优化把err合并为一句if err := context.ShouldBindUri(req); err != nil {return nil, err}return req, nil}
}
func CreateBookDetailResponse() Lib.DecodeResponseFunc {return func(context *gin.Context, i interface{}) error {res := i.(*BookDetailResponse)context.JSON(200, res)return nil}
}注:
①. 两个Response都是差不多逻辑,可以优化为:func CreateBookResponse() Lib.DecodeResponseFunc {return func(context *gin.Context, res interface{}) error {context.JSON(200, res)return nil}}

(7). 请求访问:

①. 列表:GET http://localhost/v1/books?page=1&size=1②. 详情:GET http://localhost/v1/book/200