llm: minor refactor

llm/llm.go

@@ -93,10 +93,16 @@ func NewLLMConnector(operation string,
 	// try to setup output format from config and outputschema if applicable
 	// particular llm provider can still switch to plain format if schema is invalid or structured JSON output format is not supported
 	if format, err := utils.GetEnvString(fmt.Sprintf("%s_FORMAT_OP_%s", prefix, operation)); err == nil {
-		if strings.ToUpper(format) == "PLAIN" {
-			outputFormat = OutputPlain
-			outputSchema = map[string]interface{}{}
-		} else if strings.ToUpper(format) == "JSON" && len(outputSchema) > 0 {
+		if strings.ToUpper(format) == "JSON" {
+			if len(outputSchema) < 1 {
+				return nil, fmt.Errorf("output schema is empty, cannot use JSON mode")
+			}
+			if len(outputSchemaName) < 1 {
+				return nil, fmt.Errorf("output schema name is empty, cannot use JSON mode")
+			}
+			if len(outputSchemaDesc) < 1 {
+				return nil, fmt.Errorf("output schema description is empty, cannot use JSON mode")
+			}
 			outputFormat = OutputJson
 		} else {
 			outputFormat = OutputPlain