🐞 fix(shop): 修复弱网下商品可买次数为负问题

game-server/app/servers/role/handler/shopHandler.ts

@@ -6,11 +6,12 @@ import { UserShopModel } from "../../../db/UserShop";
 import { handleCost, addItems } from "../../../services/role/rewardService";
 import { SHOP } from "../../../pubUtils/dicParam";
 import { HeroModel } from "../../../db/Hero";
-import { checkShopInPurchase, getShopDicById, getShopListByType, getShopPrice } from "../../../services/shopService";
+import { checkShopInPurchase, getShopDicById, getShopListByType, getShopPrice, getShopMaxBuyTimes } from "../../../services/shopService";
 import { RewardInter } from "../../../pubUtils/interface";
 import { UserShopTypeModel } from "../../../db/UserShopType";
 import { nowSeconds } from "../../../pubUtils/timeUtil";
 import { isGoodsHidden } from "../../../services/dataService";
+import { RoleModel } from './../../../db/Role';
 
 export default function(app: Application) {
     return new ShopHandler(app);
@@ -70,14 +71,28 @@ export class ShopHandler {
             return resResult(checkResult);
         }
 
+        // 总计可买次数（从配置表读取）
+        const totalCanBuyTimes = getShopMaxBuyTimes(dicShopItem.price);
+        if (!totalCanBuyTimes || totalCanBuyTimes <= 0) {
+            return resResult(STATUS.BATTLE_CONSUMES_NOT_ENOUGH);
+        }
+    
+        // 最大已买次数 = 总计可买次数 - 本次要买次数
+        const maxAlreadyBuyTimes = totalCanBuyTimes - count;
+        
         // 消耗
         let cost = getShopPrice(dicShopItem.money, count, userShop?.count||0, dicShopItem.price);
         let costResult = await handleCost(roleId, sid, cost, ITEM_CHANGE_REASON.SHOP_PURCHASE);
         if(!costResult) return resResult(STATUS.BATTLE_CONSUMES_NOT_ENOUGH);
 
         // 次数
-        userShop = await UserShopModel.purchase(roleId, roleName, activityId, dicShopItem, count, seasonNum);
-        if(!userShop) return resResult(STATUS.BUY_COUNT_OVER);
+        userShop = await UserShopModel.protectedPurchase(roleId, roleName, activityId, dicShopItem, count, seasonNum, maxAlreadyBuyTimes);
+        if (!userShop) {
+            // rollback 消耗
+            let role = await RoleModel.findByRoleId(roleId);
+            addItems(roleId, role.roleName, sid, cost, ITEM_CHANGE_REASON.SHOP_PURCHASE);
+            return resResult(STATUS.BUY_COUNT_OVER);
+        }
 
         // 获得
         let reward = [{