Golang技术在企业级微服务开发中的架构设计

// 业务逻辑微服务
type UserService struct {
    db *sql.DB
}

func (s *UserService) GetUser(id int64) (*User, error) {
    var user User
    err := s.db.QueryRow("SELECT * FROM users WHERE id = ?", id).Scan(&user.ID, &user.Name, &user.Email)
    return &user, err
}

// 通信层
type HttpServer struct {
    mux *http.ServeMux
}

func (s *HttpServer) HandleGetRequest() http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        id, err := strconv.ParseInt(r.URL.Query().Get("id"), 10, 64)
        if err != nil {
            http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
            return
        }

        user, err := userService.GetUser(id)
        if err != nil {
            http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
            return
        }

        json.NewEncoder(w).Encode(user)
    }
}

// 主函数
func main() {
    db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/db_name")
    if err != nil {
        log.Fatal(err)
    }

    userService := &UserService{db: db}

    httpServer := &HttpServer{mux: http.NewServeMux()}
    httpServer.mux.HandleFunc("/user", httpServer.HandleGetRequest())

    log.Fatal(http.ListenAndServe(":8080", httpServer.mux))
}