Merge pull request #377 from vadimi/master

Panic template execution errors to show error pages accordingly

@@ -138,6 +138,7 @@ func (c *Controller) RenderBytes() ([]byte, error) {
 		err := BeeTemplates[c.TplNames].ExecuteTemplate(newbytes, c.TplNames, c.Data)
 		if err != nil {
 			Trace("template Execute err:", err)
+			return nil, err
 		}
 		tplcontent, _ := ioutil.ReadAll(newbytes)
 		c.Data["LayoutContent"] = template.HTML(string(tplcontent))
@@ -145,6 +146,7 @@ func (c *Controller) RenderBytes() ([]byte, error) {
 		err = BeeTemplates[c.Layout].ExecuteTemplate(ibytes, c.Layout, c.Data)
 		if err != nil {
 			Trace("template Execute err:", err)
+			return nil, err
 		}
 		icontent, _ := ioutil.ReadAll(ibytes)
 		return icontent, nil
@@ -163,6 +165,7 @@ func (c *Controller) RenderBytes() ([]byte, error) {
 		err := BeeTemplates[c.TplNames].ExecuteTemplate(ibytes, c.TplNames, c.Data)
 		if err != nil {
 			Trace("template Execute err:", err)
+			return nil, err
 		}
 		icontent, _ := ioutil.ReadAll(ibytes)
 		return icontent, nil

@@ -26,7 +26,10 @@ const (
 	FinishRouter
 )
 
-var HTTPMETHOD = []string{"get", "post", "put", "delete", "patch", "options", "head"}
+var (
+	HTTPMETHOD = []string{"get", "post", "put", "delete", "patch", "options", "head"}
+	errorType  = reflect.TypeOf((*error)(nil)).Elem()
+)
 
 type controllerInfo struct {
 	pattern        string
@@ -729,7 +732,7 @@ func (p *ControllerRegistor) ServeHTTP(rw http.ResponseWriter, r *http.Request)
 			if !w.started && !context.Input.IsWebsocket() {
 				if AutoRender {
 					method = vc.MethodByName("Render")
-					method.Call(in)
+					callMethodWithError(method, in)
 				}
 			}
 		}
@@ -920,3 +923,15 @@ func (w *responseWriter) WriteHeader(code int) {
 	w.started = true
 	w.writer.WriteHeader(code)
 }
+
+// call method and panic with error if error is in result params
+func callMethodWithError(method reflect.Value, params []reflect.Value) {
+	results := method.Call(params)
+	if len(results) > 0 {
+		for _, result := range results {
+			if result.Type() == errorType && !result.IsNil() {
+				panic(result.Interface().(error))
+			}
+		}
+	}
+}