feat(serverHandler): provide main error information

make `HasNotFoundError` and `HasInternalError` accessible for template,
so that it could show hints for end users.

Author: marjune163

src/serverHandler/json.go

@@ -54,9 +54,9 @@ func (h *handler) json(w http.ResponseWriter, r *http.Request, data *responseDat
 	header.Set("Content-Type", "application/json; charset=utf-8")
 	header.Set("Cache-Control", "public, max-age=0")
 
-	if data.hasInternalError {
+	if data.HasInternalError {
 		w.WriteHeader(http.StatusInternalServerError)
-	} else if data.hasNotFoundError {
+	} else if data.HasNotFoundError {
 		w.WriteHeader(http.StatusNotFound)
 	} else {
 		w.WriteHeader(http.StatusOK)

src/serverHandler/page.go

@@ -7,9 +7,9 @@ func (h *handler) page(w http.ResponseWriter, r *http.Request, data *responseDat
 	header.Set("Content-Type", "text/html; charset=utf-8")
 	header.Set("Cache-Control", "public, max-age=0")
 
-	if data.hasInternalError {
+	if data.HasInternalError {
 		w.WriteHeader(http.StatusInternalServerError)
-	} else if data.hasNotFoundError {
+	} else if data.HasNotFoundError {
 		w.WriteHeader(http.StatusNotFound)
 	} else {
 		w.WriteHeader(http.StatusOK)

src/serverHandler/responseData.go

@@ -40,9 +40,9 @@ type responseData struct {
 	rawReqPath     string
 	handlerReqPath string
 
-	hasNotFoundError bool
-	hasInternalError bool
 	errors           []error
+	HasNotFoundError bool
+	HasInternalError bool
 
 	IsRoot        bool
 	Path          string
@@ -265,9 +265,9 @@ func (h *handler) getResponseData(r *http.Request) (data *responseData) {
 
 	rawReqPath := util.CleanUrlPath(requestUri)
 	reqPath := util.CleanUrlPath(rawReqPath[len(h.urlPrefix):]) // strip url prefix path
+	errs := []error{}
 	notFound := false
 	internalError := false
-	errs := []error{}
 
 	isRoot := rawReqPath == "/"
 
@@ -321,9 +321,9 @@ func (h *handler) getResponseData(r *http.Request) (data *responseData) {
 		rawReqPath:     rawReqPath,
 		handlerReqPath: reqPath,
 
-		hasNotFoundError: notFound,
-		hasInternalError: internalError,
 		errors:           errs,
+		HasNotFoundError: notFound,
+		HasInternalError: internalError,
 
 		IsRoot:        isRoot,
 		Path:          rawReqPath,

src/tpl/assert/main.css

@@ -213,6 +213,12 @@ em {
 	float: right;
 }
 
+.error {
+	margin: 1em;
+	padding: 1em;
+	background: #ffc;
+}
+
 @media only screen and (max-width: 350px) {
 	.item-list .time {
 		display: none;

src/tpl/assert/main.css.go

@@ -184,6 +184,11 @@ white-space: nowrap;
 overflow: hidden;
 float: right;
 }
+.error {
+margin: 1em;
+padding: 1em;
+background: #ffc;
+}
 @media only screen and (max-width: 350px) {
 .item-list .time {
 display: none;

src/tpl/page.html

@@ -56,6 +56,9 @@
 	{{end}}{{end}}
 </ul>
 
+{{if .HasNotFoundError}}<div class="error">resource not found</div>{{end}}
+{{if .HasInternalError}}<div class="error">potential issue occurred</div>{{end}}
+
 <script type="text/javascript" src="{{.RootRelPath}}/../assert/main.js"></script>
 </body>
 </html>

src/tpl/page.html.go

@@ -60,6 +60,8 @@ const pageTplStr = `
 </li>
 {{end}}{{end}}
 </ul>
+{{if .HasNotFoundError}}<div class="error">resource not found</div>{{end}}
+{{if .HasInternalError}}<div class="error">potential issue occurred</div>{{end}}
 <script type="text/javascript" src="{{.RootRelPath}}?assert=main.js"></script>
 </body>
 </html>