修复文件

src/main/resources/lua/flashsale.lua

@@ -4,7 +4,13 @@
 -- 返回值：成功返回剩余库存，失败返回负数
 
 local stock_key = KEYS[1]
-local quantity = tonumber(ARGV[1])
+local quantity_str = ARGV[1]
+local quantity = tonumber(quantity_str)
+
+-- 检查quantity参数是否有效
+if quantity == nil or quantity <= 0 then
+    return -3
+end
 
 -- 获取当前库存
 local current_stock = redis.call('GET', stock_key)
@@ -15,10 +21,15 @@ if current_stock == false then
 end
 
 -- 转换为数字
-current_stock = tonumber(current_stock)
+local current_stock_num = tonumber(current_stock)
+
+-- 检查转换是否成功
+if current_stock_num == nil then
+    return -1
+end
 
 -- 检查库存是否足够
-if current_stock < quantity then
+if current_stock_num < quantity then
     return -2
 end