gpt

internal/mysqldao/user.go

@@ -6,6 +6,7 @@ import (
 	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/global"
 	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/mysqlmodel"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 )
 
 // UserDao 用户数据访问
@@ -56,6 +57,25 @@ func (d *UserDao) VIPGrantIdempotent(ctx context.Context, userID int64, now int6
 	defer span.End()
 
 	return d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		var before mysqlmodel.User
+		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Where("id = ?", userID).First(&before).Error; err != nil {
+			return err
+		}
+		// 购买开通/续费使用稳定的订单级幂等判断，不让重试后的 change_type 变化绕过唯一键。
+		if flow.ChangeType == 1 || flow.ChangeType == 2 {
+			var count int64
+			if err := tx.Model(&mysqlmodel.VIPFlowLog{}).Where("order_no = ? AND change_type IN ?", flow.OrderNo, []int8{1, 2}).Count(&count).Error; err != nil {
+				return err
+			}
+			if count > 0 {
+				return nil
+			}
+			flow.ChangeType = 1
+			if before.VIPType != 1 && before.VIPExpire > now {
+				flow.ChangeType = 2
+			}
+			flow.OldVIPType, flow.OldVIPExpire = before.VIPType, before.VIPExpire
+		}
 		sql := `UPDATE users SET
 			vip_start = CASE WHEN vip_type = 1 OR vip_expire <= ? THEN ? ELSE vip_start END,
 			vip_expire = (CASE WHEN vip_expire > ? THEN vip_expire ELSE ? END) + ?