/
trasnsport.go
132 lines (120 loc) · 3.59 KB
/
trasnsport.go
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package food
import (
"context"
"encoding/json"
"errors"
kitlog "github.com/go-kit/kit/log"
"github.com/go-kit/kit/transport"
kithttp "github.com/go-kit/kit/transport/http"
"github.com/gorilla/mux"
"net/http"
"what_cook/domain"
"what_cook/helper"
)
var badRequest = errors.New("bad request")
func MakeHandler(foodService domain.FoodService, logger kitlog.Logger) http.Handler {
opts := []kithttp.ServerOption{
kithttp.ServerErrorHandler(transport.NewLogErrorHandler(logger)),
kithttp.ServerErrorEncoder(encodeError),
}
foodHandler := kithttp.NewServer(
makeFoodEndpoint(foodService),
decodeFoodRequest,
encodeResponse,
opts...,
)
createFoodHandler := kithttp.NewServer(
makeCreateFoodEndpoint(foodService),
decodeCreateFoodRequest,
encodeResponse,
opts...,
)
updateFoodHandler := kithttp.NewServer(
makeUpdateFoodEndpoint(foodService),
decodeUpdateFoodRequest,
encodeResponse,
opts...,
)
deleteFoodHandler := kithttp.NewServer(
makeDeleteFoodEndpoint(foodService),
decodeDeleteFoodRequest,
encodeResponse,
opts...,
)
foodsByIngredientsHandler := kithttp.NewServer(
makeFoodsByIngredientEndpoint(foodService),
decodeFoodsByIngredientsRequest,
encodeResponse,
opts...,
)
router := mux.NewRouter()
router.Handle("/food/{id}", foodHandler).Methods("GET")
router.Handle("/food/", createFoodHandler).Methods("POST")
router.Handle("/food/{id}", updateFoodHandler).Methods("PUT")
router.Handle("/food/{id}", deleteFoodHandler).Methods("DELETE")
router.Handle("/food/byIngredients/", foodsByIngredientsHandler).Methods("GET")
return router
}
func decodeFoodRequest(_ context.Context, r *http.Request) (interface{}, error) {
if id, err := helper.GetRequestParam(r, "id"); err == nil {
return foodRequest{id}, nil
}
return nil, badRequest
}
func decodeCreateFoodRequest(_ context.Context, r *http.Request) (interface{}, error) {
var request createFoodRequest
if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
return nil, err
}
return request, nil
}
func decodeUpdateFoodRequest(_ context.Context, r *http.Request) (interface{}, error) {
if id, err := helper.GetRequestParam(r, "id"); err == nil {
var body struct {
Food *domain.Food `json:"food"`
}
if err := json.NewDecoder(r.Body).Decode(&body); err == nil {
return updateFoodRequest{id, body.Food}, nil
}
}
return nil, badRequest
}
func decodeDeleteFoodRequest(_ context.Context, r *http.Request) (interface{}, error) {
if id, err := helper.GetRequestParam(r, "id"); err == nil {
return deleteFoodRequest{id}, nil
}
return nil, badRequest
}
func decodeFoodsByIngredientsRequest(_ context.Context, r *http.Request) (interface{}, error) {
var request foodsByIngredientsRequest
if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
return nil, err
}
return request, nil
}
type errorer interface {
error() error
}
func encodeResponse(ctx context.Context, w http.ResponseWriter, response interface{}) error {
e, ok := response.(errorer)
if ok && e.error() != nil {
encodeError(ctx, e.error(), w)
return nil
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
return json.NewEncoder(w).Encode(response)
}
func encodeError(_ context.Context, err error, w http.ResponseWriter) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
switch err {
case badRequest:
w.WriteHeader(http.StatusBadRequest)
case domain.ModelNotFoundError:
w.WriteHeader(http.StatusNotFound)
default:
w.WriteHeader(http.StatusInternalServerError) // TODO: debug true|false, logging
}
json.NewEncoder(w).Encode(map[string]interface{}{
"error": err.Error(),
})
}