优化结构

internal/config/clone.go

@@ -31,6 +31,22 @@ func MergeRuntimeConfig(current, next *Config) *Config {
 	}
 	if merged.Data == nil {
 		merged.Data = cloneData(current.Data)
+	} else if current.Data != nil {
+		if merged.Data.Database == nil {
+			merged.Data.Database = clonePtr(current.Data.Database)
+		}
+		if merged.Data.Redis == nil {
+			merged.Data.Redis = cloneRedis(current.Data.Redis)
+		}
+		if merged.Data.Mongo == nil {
+			merged.Data.Mongo = cloneMongo(current.Data.Mongo)
+		}
+		if merged.Data.DatabaseList == nil {
+			merged.Data.DatabaseList = cloneSlice(current.Data.DatabaseList, clonePtr)
+		}
+		if merged.Data.RedisList == nil {
+			merged.Data.RedisList = cloneSlice(current.Data.RedisList, cloneRedis)
+		}
 	}
 	if merged.Admin == nil {
 		merged.Admin = cloneAdmin(current.Admin)

internal/config/runtime_test.go

@@ -168,3 +168,12 @@ func TestMergeRuntimeConfigPreservesOmittedSections(t *testing.T) {
 		t.Fatal("MergeRuntimeConfig leaked mutable storage state into current config")
 	}
 }
+
+func TestMergeRuntimeConfigPreservesOmittedNestedDataSections(t *testing.T) {
+	current := &Config{Data: &Data{Database: &Database{Source: "current-dsn"}}}
+	next := &Config{Data: &Data{}}
+	merged := MergeRuntimeConfig(current, next)
+	if merged.Data == nil || merged.Data.Database == nil || merged.Data.Database.Source != "current-dsn" {
+		t.Fatalf("nested database section was not preserved: %#v", merged.Data)
+	}
+}