BUG/MEDIUM: ensure server templates are ordered by name when serialized

Author: hdurand0710

configuration/structured_backends.go

@@ -317,9 +317,17 @@ func serializeBackendSection(a StructuredToParserArgs, b *models.Backend) error
 			return a.HandleError(strconv.FormatInt(int64(i), 10), BackendParentName, b.Name, a.TID, a.TID == "", err)
 		}
 	}
-	for _, template := range b.ServerTemplates {
-		if err = p.Insert(parser.Backends, b.Name, "server-template", SerializeServerTemplate(template, a.Options), -1); err != nil {
-			return a.HandleError(template.Prefix, BackendParentName, b.Name, a.TID, a.TID == "", err)
+
+	// Ensure sorting of ServerTemplates by name
+	orderedNames = make([]string, 0, len(b.ServerTemplates))
+	for name := range b.ServerTemplates {
+		orderedNames = append(orderedNames, name)
+	}
+	sort.Strings(orderedNames)
+	for _, name := range orderedNames {
+		localT := b.ServerTemplates[name]
+		if err = p.Insert(parser.Backends, b.Name, "server-template", SerializeServerTemplate(localT, a.Options), -1); err != nil {
+			return a.HandleError(localT.Prefix, BackendParentName, b.Name, a.TID, a.TID == "", err)
 		}
 	}
 	for i, rule := range b.HTTPAfterResponseRuleList {