/
transport_http.go
180 lines (154 loc) · 4.81 KB
/
transport_http.go
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package timetransport
import (
"context"
"encoding/json"
"errors"
"net/http"
"strings"
"github.com/brumhard/geckgo/pkg/timeservice"
"github.com/go-kit/kit/endpoint"
"github.com/brumhard/geckgo/pkg/timeendpoint"
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"
)
var errBadRoute = errors.New("bad route")
func NewHTTPHandler(endpoints timeendpoint.Set, logger kitlog.Logger) http.Handler {
// TODO: add auth MW (https://github.com/go-kit/kit/tree/master/auth/jwt)
opts := []kithttp.ServerOption{
kithttp.ServerErrorHandler(transport.NewLogErrorHandler(logger)),
kithttp.ServerErrorEncoder(encodeError),
}
// list
addListHandler := kithttp.NewServer(
endpoints.AddList,
decodeAddListRequest,
encodeJSONResponse,
opts...,
)
getListsHandler := kithttp.NewServer(
endpoints.GetLists,
decodeGetListsRequest,
encodeJSONResponse,
opts...,
)
getListHandler := kithttp.NewServer(
endpoints.GetList,
decodeGetListRequest,
encodeJSONResponse,
opts...,
)
updateListHandler := kithttp.NewServer(
endpoints.UpdateList,
decodeUpdateListRequest,
encodeJSONResponse,
opts...,
)
deleteListHandler := kithttp.NewServer(
endpoints.DeleteList,
decodeDeleteListRequest,
encodeJSONResponse,
opts...,
)
// day
addDayHandler := kithttp.NewServer(
endpoints.AddDay,
decodeAddDayRequest,
encodeJSONResponse,
opts...,
)
getDaysHandler := kithttp.NewServer(
endpoints.GetDays,
decodeGetDaysRequest,
encodeJSONResponse,
opts...,
)
getDayHandler := kithttp.NewServer(
endpoints.GetDay,
decodeGetDayRequest,
encodeJSONResponse,
opts...,
)
updateDayHandler := kithttp.NewServer(
endpoints.UpdateDay,
decodeUpdateDayRequest,
encodeJSONResponse,
opts...,
)
deleteDayHandler := kithttp.NewServer(
endpoints.DeleteDay,
decodeDeleteDayRequest,
encodeJSONResponse,
opts...,
)
r := mux.NewRouter()
r.Use(loggingMW(logger), contentTypeMW)
// routes
v1Router := r.PathPrefix("/v1").Subrouter()
// list
v1ListRouter := v1Router.PathPrefix("/lists").Subrouter()
v1ListRouter.Handle("", addListHandler).Methods(http.MethodPost)
v1ListRouter.Handle("", getListsHandler).Methods(http.MethodGet)
v1ListRouter.Handle("/{listId}", getListHandler).Methods(http.MethodGet)
v1ListRouter.Handle("/{listId}", updateListHandler).Methods(http.MethodPatch)
v1ListRouter.Handle("/{listId}", deleteListHandler).Methods(http.MethodDelete)
// day
v1DayRouter := v1Router.PathPrefix("/lists/{listId}/days").Subrouter()
v1DayRouter.Handle("/{date}", addDayHandler).Methods(http.MethodPut)
v1DayRouter.Handle("", getDaysHandler).Methods(http.MethodGet)
v1DayRouter.Handle("/{date}", getDayHandler).Methods(http.MethodGet)
v1DayRouter.Handle("/{date}", updateDayHandler).Methods(http.MethodPatch)
v1DayRouter.Handle("/{date}", deleteDayHandler).Methods(http.MethodDelete)
return cutTrailingSlashMW(r)
}
func cutTrailingSlashMW(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = strings.TrimSuffix(r.URL.Path, "/")
next.ServeHTTP(w, r)
})
}
func contentTypeMW(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
contentTypeHeader := r.Header.Get("Content-Type")
if contentTypeHeader != "" && contentTypeHeader != "application/json" {
http.Error(w, "unsupported content-type", http.StatusBadRequest)
return
}
next.ServeHTTP(w, r)
})
}
func encodeJSONResponse(ctx context.Context, w http.ResponseWriter, response interface{}) error {
if e, ok := response.(endpoint.Failer); ok && e.Failed() != nil {
encodeError(ctx, e.Failed(), w)
return nil
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
return json.NewEncoder(w).Encode(response)
}
func err2code(err error) int {
var valErr *timeendpoint.ValidationErr
isErr := func(target error) bool {
return errors.Is(err, target)
}
switch {
case isErr(timeservice.ErrNotFound):
return http.StatusNotFound
case isErr(timeservice.ErrConflict):
return http.StatusConflict
case isErr(timeservice.ErrInvalidMomentType), isErr(timeservice.ErrInvalidDuration),
isErr(timeservice.ErrAlreadyStarted), isErr(timeservice.ErrNotStartedYet), isErr(timeservice.ErrNotEndedYet),
errors.As(err, &valErr):
return http.StatusBadRequest
}
return http.StatusInternalServerError
}
// encodeError is not only called for errors in an endpoint's but also for errors during decoding.
// That's why headers need to be set here as well as in the encodeJSONResponse function.
func encodeError(_ context.Context, err error, w http.ResponseWriter) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.WriteHeader(err2code(err))
_ = json.NewEncoder(w).Encode(map[string]interface{}{
"error": err.Error(),
})
}