router handler to report errors via json

Signed-off-by: Michael <michael.lindman@gmail.com>

go.mod

@@ -5,8 +5,8 @@ go 1.15
 require (
 	github.com/gorilla/csrf v1.7.0
 	github.com/gorilla/mux v1.8.0
-	github.com/magefile/mage v1.11.0 // indirect
-	github.com/sirupsen/logrus v1.8.0
-	golang.org/x/sys v0.0.0-20210308170721-88b6017d0656 // indirect
-	google.golang.org/protobuf v1.25.0
+	github.com/sirupsen/logrus v1.8.1
+	golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 // indirect
+	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 // indirect
+	google.golang.org/protobuf v1.26.0
 )

router/errors.go

@@ -1,6 +1,7 @@
 package router
 
 import (
+	"fmt"
 	"net/http"
 )
 
@@ -14,6 +15,7 @@ type HTTPStatusError struct {
 	statuscode int
 	err        error
 	body       interface{}
+	output     bool
 }
 
 // HTTPError handle HTTP error
@@ -26,6 +28,11 @@ func HTTPErrorWithBody(body interface{}, statuscode int, err error) *HTTPStatusE
 	return &HTTPStatusError{body: body, statuscode: statuscode, err: err}
 }
 
+// HTTPErrorWithReport handle HTTP error returning status report
+func HTTPErrorWithReport(statuscode int, err error) *HTTPStatusError {
+	return &HTTPStatusError{statuscode: statuscode, err: err, output: true}
+}
+
 // RespondError HTTP error response
 func (e *HTTPStatusError) RespondError(w http.ResponseWriter, r *http.Request, re *Router) bool {
 	if e.err != nil {
@@ -35,7 +42,15 @@ func (e *HTTPStatusError) RespondError(w http.ResponseWriter, r *http.Request, r
 			re.logger.Error.Error(e.err)
 		}
 	}
-	if e.body == nil {
+	if e.output {
+		re.Respond(struct {
+			Status string
+			Error  string
+		}{
+			Status: fmt.Sprintf("%d %s", e.statuscode, http.StatusText(e.statuscode)),
+			Error:  e.err.Error(),
+		}, e.statuscode).ServeHTTP(w, r)
+	} else if e.body == nil {
 		re.handleError(e.statuscode).ServeHTTP(w, r)
 	} else {
 		re.Respond(e.body, e.statuscode).ServeHTTP(w, r)

router/router.go

@@ -75,8 +75,8 @@ func (re *Router) Response(resp *Response, statuscode int) HandlerFunc {
 func (re *Router) Respond(data interface{}, status int) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		re.logger.AccessMessage(r, status)
-		w.WriteHeader(status)
 		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(status)
 		if data != nil {
 			if err := json.NewEncoder(w).Encode(data); err != nil {
 				re.logger.Error.Errorf("faield to encode a response: %v", err)