refactor

gs/dao/dao.go

@@ -15,17 +15,17 @@ type Dao struct {
 	db     *mongo.Database
 }
 
-func NewDao() (r *Dao) {
+func NewDao() (r *Dao, err error) {
 	r = new(Dao)
 	clientOptions := options.Client().ApplyURI(config.CONF.Database.Url)
 	client, err := mongo.Connect(context.TODO(), clientOptions)
 	if err != nil {
 		logger.LOG.Error("mongo connect error: %v", err)
-		return nil
+		return nil, err
 	}
 	r.client = client
 	r.db = client.Database("game_hk4e")
-	return r
+	return r, nil
 }
 
 func (d *Dao) CloseDao() {