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api/resource/book/handler.go

@@ -43,7 +43,7 @@ func (a *API) List(w http.ResponseWriter, r *http.Request) {
 	books, err := a.repository.List()
 	if err != nil {
 		a.logger.Error().Err(err).Msg("")
-		e.ServerError(w, e.DataAccessFailure)
+		e.ServerError(w, e.RespDBDataAccessFailure)
 		return
 	}
 
@@ -54,7 +54,7 @@ func (a *API) List(w http.ResponseWriter, r *http.Request) {
 
 	if err := json.NewEncoder(w).Encode(books.ToDto()); err != nil {
 		a.logger.Error().Err(err).Msg("")
-		e.ServerError(w, e.JsonEncodingFailure)
+		e.ServerError(w, e.RespJSONEncodeFailure)
 		return
 	}
 }
@@ -76,21 +76,15 @@ func (a *API) Create(w http.ResponseWriter, r *http.Request) {
 	form := &Form{}
 	if err := json.NewDecoder(r.Body).Decode(form); err != nil {
 		a.logger.Error().Err(err).Msg("")
-		e.BadRequest(w, e.JsonDecodingFailure)
+		e.BadRequest(w, e.RespJSONDecodeFailure)
 		return
 	}
 
 	if err := a.validator.Struct(form); err != nil {
-		resp := validatorUtil.ToErrResponse(err)
-		if resp == nil {
-			e.ServerError(w, e.FormErrResponseFailure)
-			return
-		}
-
-		respBody, err := json.Marshal(resp)
+		respBody, err := json.Marshal(validatorUtil.ToErrResponse(err))
 		if err != nil {
 			a.logger.Error().Err(err).Msg("")
-			e.ServerError(w, e.JsonEncodingFailure)
+			e.ServerError(w, e.RespJSONEncodeFailure)
 			return
 		}
 
@@ -104,7 +98,7 @@ func (a *API) Create(w http.ResponseWriter, r *http.Request) {
 	book, err := a.repository.Create(newBook)
 	if err != nil {
 		a.logger.Error().Err(err).Msg("")
-		e.ServerError(w, e.DataCreationFailure)
+		e.ServerError(w, e.RespDBDataInsertFailure)
 		return
 	}
 
@@ -128,7 +122,7 @@ func (a *API) Create(w http.ResponseWriter, r *http.Request) {
 func (a *API) Read(w http.ResponseWriter, r *http.Request) {
 	id, err := uuid.Parse(chi.URLParam(r, "id"))
 	if err != nil {
-		e.BadRequest(w, e.InvalidIdInUrlParam)
+		e.BadRequest(w, e.RespInvalidURLParamID)
 		return
 	}
 
@@ -140,14 +134,14 @@ func (a *API) Read(w http.ResponseWriter, r *http.Request) {
 		}
 
 		a.logger.Error().Err(err).Msg("")
-		e.ServerError(w, e.DataAccessFailure)
+		e.ServerError(w, e.RespDBDataAccessFailure)
 		return
 	}
 
 	dto := book.ToDto()
 	if err := json.NewEncoder(w).Encode(dto); err != nil {
 		a.logger.Error().Err(err).Msg("")
-		e.ServerError(w, e.JsonEncodingFailure)
+		e.ServerError(w, e.RespJSONEncodeFailure)
 		return
 	}
 }
@@ -170,28 +164,22 @@ func (a *API) Read(w http.ResponseWriter, r *http.Request) {
 func (a *API) Update(w http.ResponseWriter, r *http.Request) {
 	id, err := uuid.Parse(chi.URLParam(r, "id"))
 	if err != nil {
-		e.BadRequest(w, e.InvalidIdInUrlParam)
+		e.BadRequest(w, e.RespInvalidURLParamID)
 		return
 	}
 
 	form := &Form{}
 	if err := json.NewDecoder(r.Body).Decode(form); err != nil {
 		a.logger.Error().Err(err).Msg("")
-		e.BadRequest(w, e.JsonDecodingFailure)
+		e.BadRequest(w, e.RespJSONDecodeFailure)
 		return
 	}
 
 	if err := a.validator.Struct(form); err != nil {
-		resp := validatorUtil.ToErrResponse(err)
-		if resp == nil {
-			e.ServerError(w, e.FormErrResponseFailure)
-			return
-		}
-
-		respBody, err := json.Marshal(resp)
+		respBody, err := json.Marshal(validatorUtil.ToErrResponse(err))
 		if err != nil {
 			a.logger.Error().Err(err).Msg("")
-			e.ServerError(w, e.JsonEncodingFailure)
+			e.ServerError(w, e.RespJSONEncodeFailure)
 			return
 		}
 
@@ -205,7 +193,7 @@ func (a *API) Update(w http.ResponseWriter, r *http.Request) {
 	rows, err := a.repository.Update(book)
 	if err != nil {
 		a.logger.Error().Err(err).Msg("")
-		e.ServerError(w, e.DataUpdateFailure)
+		e.ServerError(w, e.RespDBDataUpdateFailure)
 		return
 	}
 	if rows == 0 {
@@ -232,14 +220,14 @@ func (a *API) Update(w http.ResponseWriter, r *http.Request) {
 func (a *API) Delete(w http.ResponseWriter, r *http.Request) {
 	id, err := uuid.Parse(chi.URLParam(r, "id"))
 	if err != nil {
-		e.BadRequest(w, e.InvalidIdInUrlParam)
+		e.BadRequest(w, e.RespInvalidURLParamID)
 		return
 	}
 
 	rows, err := a.repository.Delete(id)
 	if err != nil {
 		a.logger.Error().Err(err).Msg("")
-		e.ServerError(w, e.DataDeletionFailure)
+		e.ServerError(w, e.RespDBDataRemoveFailure)
 		return
 	}
 	if rows == 0 {

api/resource/common/err/err.go

@@ -1,22 +1,19 @@
 package err
 
 import (
-	"fmt"
 	"net/http"
 )
 
-const (
-	DataCreationFailure = "data creation failure"
-	DataAccessFailure   = "data access failure"
-	DataUpdateFailure   = "data update failure"
-	DataDeletionFailure = "data deletion failure"
+var (
+	RespDBDataInsertFailure = []byte(`{"error": "db data insert failure"}`)
+	RespDBDataAccessFailure = []byte(`{"error": "db data access failure"}`)
+	RespDBDataUpdateFailure = []byte(`{"error": "db data update failure"}`)
+	RespDBDataRemoveFailure = []byte(`{"error": "db data remove failure"}`)
 
-	JsonEncodingFailure = "json encoding failure"
-	JsonDecodingFailure = "json decoding failure"
+	RespJSONEncodeFailure = []byte(`{"error": "json encode failure"}`)
+	RespJSONDecodeFailure = []byte(`{"error": "json decode failure"}`)
 
-	FormErrResponseFailure = "form error response failure"
-
-	InvalidIdInUrlParam = "invalid id in url param"
+	RespInvalidURLParamID = []byte(`{"error": "invalid url param-id"}`)
 )
 
 type Error struct {
@@ -27,14 +24,14 @@ type Errors struct {
 	Errors []string `json:"errors"`
 }
 
-func ServerError(w http.ResponseWriter, msg string) {
+func ServerError(w http.ResponseWriter, error []byte) {
 	w.WriteHeader(http.StatusInternalServerError)
-	fmt.Fprintf(w, `{"error": "%v"}`, msg)
+	w.Write(error)
 }
 
-func BadRequest(w http.ResponseWriter, msg string) {
+func BadRequest(w http.ResponseWriter, error []byte) {
 	w.WriteHeader(http.StatusBadRequest)
-	fmt.Fprintf(w, `{"error": "%v"}`, msg)
+	w.Write(error)
 }
 
 func ValidationErrors(w http.ResponseWriter, reps []byte) {