🐞 fix(shop): 修复弱网下商品可买次数为负问题

shared/db/UserShop.ts

@@ -95,6 +95,33 @@ export default class UserShop extends BaseModel {
         return rec;
     }
 
+    /**
+     * 防止并发操作的购买
+     *
+     * @static
+     * @param {string} roleId
+     * @param {string} roleName
+     * @param {number} activityId
+     * @param {{ id: number, goodId: number, refreshType: number, shop: number, type: number, createTime?: number }} dicShopItem
+     * @param {number} inc
+     * @param {number} seasonNum
+     * @param {number} maxAlreadyBuyTimes: 最大已买次数，通过这个参数防止并发购买
+     * @return {*} 
+     * @memberof UserShop
+     */
+    public static async protectedPurchase(roleId: string, roleName: string, activityId: number, dicShopItem: { id: number, goodId: number, refreshType: number, shop: number, type: number, createTime?: number }, inc: number, seasonNum: number, maxAlreadyBuyTimes: number) {
+        let code = genCode(8);
+        let timeCondition = this.getRefreshCondition(seasonNum);
+        let { id, goodId, refreshType, shop, type, createTime = 0 } = dicShopItem;
+
+        let rec: UserShopType = await UserShopModel.findOneAndUpdate(
+            { roleId, itemId: id, $or: timeCondition, shop, type, createTime, count: {$lte: maxAlreadyBuyTimes} }, 
+            { $setOnInsert: { roleName, code, goodId, refreshType, seasonNum }, $inc: { count: inc }, $set: { activityId } },
+            { new: true, upsert: true }
+        ).lean();
+        return rec;
+    }
+
     public static async deleteAccount(roleId: string) {
         let result = await UserShopModel.deleteMany({roleId});
         return result;

shared/resource/jsons/server_const.json

@@ -25,7 +25,8 @@
         { "id": 6, "desc": "获取信息", "route": "connector.entryHandler.getData", "param": {}, "interval": 1000 },
         { "id": 7, "desc": "刷新信息", "route": "connector.entryHandler.refresh", "param": {}, "interval": 1000 },
         { "id": 8, "desc": "捐赠", "route": "guild.donateHandler.donate", "param": {}, "interval": 200 },
-        { "id": 9, "desc": "碾压镇念塔", "route": "battle.towerBattleHandler.skipTower", "param": {}, "interval": 200 }
+        { "id": 9, "desc": "碾压镇念塔", "route": "battle.towerBattleHandler.skipTower", "param": {}, "interval": 200 },
+        { "id": 10, "desc": "商店购买商品", "route": "role.shopHandler.purchase", "param": {}, "interval": 50 }
     ],
     "TIME_STAMP_OVER": 900000,
     "ACCESS_CODE_EXPIRE_TIME": 900000,