From 3795eddcf5624329cd3255e8e3f62f12ff2fc669 Mon Sep 17 00:00:00 2001
From: Tony Chen <zhihui_chen@foxmail.com>
Date: Sat, 3 Jul 2021 15:30:19 +0800
Subject: [PATCH] fix config decoder (#1142)

---
 config/config.go | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/config/config.go b/config/config.go
index f078a1008..ccefd7f46 100644
--- a/config/config.go
+++ b/config/config.go
@@ -51,11 +51,15 @@ type config struct {
 func New(opts ...Option) Config {
 	options := options{
 		logger: log.DefaultLogger,
-		decoder: func(kv *KeyValue, v map[string]interface{}) error {
-			if codec := encoding.GetCodec(kv.Format); codec != nil {
-				return codec.Unmarshal(kv.Value, &v)
+		decoder: func(src *KeyValue, target map[string]interface{}) error {
+			if src.Format == "" {
+				target[src.Key] = src.Value
+				return nil
 			}
-			return fmt.Errorf("unsupported key: %s format: %s", kv.Key, kv.Format)
+			if codec := encoding.GetCodec(src.Format); codec != nil {
+				return codec.Unmarshal(src.Value, &target)
+			}
+			return fmt.Errorf("unsupported key: %s format: %s", src.Key, src.Format)
 		},
 	}
 	for _, o := range opts {