143 lines
4.0 KiB
Go
143 lines
4.0 KiB
Go
package kills
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import (
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"encoding/base64"
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"fmt"
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"github.com/gin-gonic/gin"
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"gorm.io/gorm"
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"log"
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"math/rand"
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"time"
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"toutoukan/init/databaseInit"
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)
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const (
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colorRed = "\033[31m" // 红色
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colorGreen = "\033[32m" // 绿色
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colorYellow = "\033[33m" // 黄色
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colorBlue = "\033[34m" // 蓝色
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colorReset = "\033[0m" // 重置颜色
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)
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type Goods struct {
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GID uint `gorm:"column:gid"`
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Stock int `gorm:"column:stock"`
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StartTime time.Time `gorm:"column:start_time"`
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EndTime time.Time `gorm:"column:end_time"`
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}
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// Order 订单模型，对应 orders_list 表
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type Order struct {
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OrderId string `gorm:"column:order_id"` // 关联商品ID
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TradeTime time.Time `gorm:"column:trade_time"`
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}
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// 为模型指定数据库表名
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func (Goods) TableName() string {
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return "goods_list"
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}
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func (Order) TableName() string {
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return "oders_list"
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}
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// 生成25位随机订单编号（string类型）
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func GenerateOrderID() string {
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// 1. 取当前时间戳（精确到毫秒，8位数字）
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timestamp := time.Now().Format("20060102150405") // 年月日时分秒（14位）
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// 2. 生成随机字符串（11位，补足25位）
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randomBytes := make([]byte, 8) // 8字节随机数经base64编码后约11字符
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_, err := rand.Read(randomBytes)
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if err != nil {
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// 出错时降级为伪随机数
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return fmt.Sprintf("ORD%s%011d", timestamp, time.Now().UnixNano()%100000000000)
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}
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// 3. 拼接前缀+时间戳+随机字符串（确保25位）
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randomStr := base64.URLEncoding.EncodeToString(randomBytes)[:11] // 截取前11位
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return fmt.Sprintf("ORD%s%s", timestamp, randomStr)
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}
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func Userkill(c *gin.Context) {
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// 直接使用全局初始化好的 UserDB 连接池
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db := databaseInit.UserDB
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if db == nil {
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log.Printf("%sUserDB 未初始化，请先调用 InitUserDB()%s\n", colorRed, colorReset)
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c.JSON(500, gin.H{"error": "系统数据库未初始化"})
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return
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}
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fmt.Printf("%s用户请求处理完成%s\n", colorBlue, colorReset)
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// 定义要查询的商品ID
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var targetGID uint = 1
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var goods Goods
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tx := db.Begin()
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if tx.Error != nil {
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log.Printf("%s开启事务失败: %v%s\n", colorRed, tx.Error, colorReset)
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c.JSON(500, gin.H{"body": "事务开启失败"})
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return
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}
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result := tx.Set("gorm:query_option", "FOR UPDATE").Where("gid = ?", targetGID).First(&goods)
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if result.Error != nil {
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tx.Rollback() // 失败回滚事务
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log.Printf("%s查询商品失败: %v%s\n", colorRed, result.Error, colorReset)
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c.JSON(404, gin.H{"error": "商品不存在"})
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return
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}
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// 2. 检查库存是否充足
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if goods.Stock <= 0 {
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tx.Rollback()
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log.Printf("%s商品库存不足%s\n", colorYellow, colorReset)
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c.JSON(400, gin.H{"error": "商品库存不足"})
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return
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}
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// 3. 生成订单
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order := Order{
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OrderId: GenerateOrderID(),
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TradeTime: time.Now(),
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}
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if err := tx.Create(&order).Error; err != nil {
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tx.Rollback()
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log.Printf("%s创建订单失败: %v%s\n", colorRed, err, colorReset)
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c.JSON(500, gin.H{"error": "创建订单失败"})
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return
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}
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updateResult := tx.Model(&Goods{}).
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Where("gid = ? AND stock > 0", targetGID).
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Update("stock", gorm.Expr("stock - 1"))
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if updateResult.Error != nil {
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tx.Rollback()
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log.Printf("%s扣减库存失败: %v%s\n", colorRed, updateResult.Error, colorReset)
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c.JSON(500, gin.H{"error": "库存更新失败"})
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return
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}
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// 5. 检查库存是否实际被扣减（防止并发下库存已被其他事务耗尽）
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if updateResult.RowsAffected == 0 {
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tx.Rollback()
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log.Printf("%s库存扣减失败：并发冲突，库存已不足%s\n", colorRed, colorReset)
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c.JSON(400, gin.H{"error": "商品库存不足"})
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return
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}
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// 5. 提交事务
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if err := tx.Commit().Error; err != nil {
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tx.Rollback()
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log.Printf("%s提交事务失败: %v%s\n", colorRed, err, colorReset)
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c.JSON(500, gin.H{"error": "系统错误"})
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return
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}
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log.Printf("%s订单创建成功，订单ID: %s，剩余库存: %d%s\n", colorGreen, order.OrderId, goods.Stock-1, colorReset)
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c.JSON(200, gin.H{
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"message": "下单成功",
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"order_id": order.OrderId,
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"stock": goods.Stock - 1,
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})
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}
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