learning_cloud_native_go.11.HandleUpdateBook.app.bookHandler.go

func (app *App) HandleUpdateBook(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseUint(chi.URLParam(r, "id"), 0, 64)
	if err != nil || id == 0 {
		app.logger.Info().Msgf("can not parse ID: %v", id)

		w.WriteHeader(http.StatusUnprocessableEntity)
		return
	}

	form := &model.BookForm{}
	if err := json.NewDecoder(r.Body).Decode(form); err != nil {
		app.logger.Warn().Err(err).Msg("")

		w.WriteHeader(http.StatusUnprocessableEntity)
		fmt.Fprintf(w, `{"error": "%v"}`, appErrFormDecodingFailure)
		return
	}

	bookModel, err := form.ToModel()
	if err != nil {
		app.logger.Warn().Err(err).Msg("")

		w.WriteHeader(http.StatusUnprocessableEntity)
		fmt.Fprintf(w, `{"error": "%v"}`, appErrFormDecodingFailure)
		return
	}

	bookModel.ID = uint(id)
	if err := repository.UpdateBook(app.db, bookModel); err != nil {
		if err == gorm.ErrRecordNotFound {
			w.WriteHeader(http.StatusNotFound)
			return
		}

		app.logger.Warn().Err(err).Msg("")

		w.WriteHeader(http.StatusInternalServerError)
		fmt.Fprintf(w, `{"error": "%v"}`, appErrDataUpdateFailure)
		return
	}

	app.logger.Info().Msgf("Book updated: %d", id)
	w.WriteHeader(http.StatusAccepted)
}