118 lines
2.6 KiB
Go
118 lines
2.6 KiB
Go
package services
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import (
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"encoding/json"
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"fmt"
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"platform/web/core"
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g "platform/web/globals"
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m "platform/web/models"
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q "platform/web/queries"
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"github.com/shopspring/decimal"
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)
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var User = &userService{}
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type userService struct{}
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func (s *userService) UpdateBalanceByTrade(uid int32, info *RechargeProductInfo, trade *m.Trade) (err error) {
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err = g.Redsync.WithLock(userBalanceKey(uid), func() error {
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return q.Q.Transaction(func(q *q.Query) error {
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err = updateBalance(q, uid, info)
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if err != nil {
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return err
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}
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// 生成账单
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subject, err := info.GetSubject()
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if err != nil {
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return err
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}
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amount, err := info.GetAmount()
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if err != nil {
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return err
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}
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err = q.Bill.Create(newForRecharge(uid, Bill.GenNo(), subject, amount, trade))
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if err != nil {
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return core.NewServErr("生成账单失败", err)
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}
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return nil
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})
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})
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if err != nil {
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return core.NewServErr("更新用户余额失败")
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}
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return nil
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}
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func updateBalance(q *q.Query, uid int32, info *RechargeProductInfo) error {
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user, err := q.User.
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Where(q.User.ID.Eq(uid)).Take()
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if err != nil {
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return core.NewServErr("查询用户失败", err)
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}
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amount, err := info.GetAmount()
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if err != nil {
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return err
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}
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balance := user.Balance.Add(amount)
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if balance.IsNegative() {
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return core.NewServErr("用户余额不足")
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}
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_, err = q.User.
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Where(q.User.ID.Eq(user.ID)).
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UpdateSimple(q.User.Balance.Value(balance))
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if err != nil {
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return core.NewServErr("更新用户余额失败", err)
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}
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return nil
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}
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func userBalanceKey(uid int32) string {
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return fmt.Sprintf("user:%d:balance", uid)
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}
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type RechargeProductInfo struct {
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Amount int `json:"amount"`
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}
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func (r *RechargeProductInfo) GetType() m.TradeType {
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return m.TradeTypeRecharge
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}
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func (r *RechargeProductInfo) GetSubject() (string, error) {
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amount, _ := r.GetAmount()
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return fmt.Sprintf("账户充值 - %s元", amount.StringFixed(2)), nil
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}
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func (r *RechargeProductInfo) GetAmount() (decimal.Decimal, error) {
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return decimal.NewFromInt(int64(r.Amount)).Div(decimal.NewFromInt(100)), nil
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}
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func (r *RechargeProductInfo) Serialize() (string, error) {
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bytes, err := json.Marshal(r)
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return string(bytes), err
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}
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func (r *RechargeProductInfo) Deserialize(str string) error {
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return json.Unmarshal([]byte(str), r)
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}
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type UserOnTradeComplete struct{}
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func (u UserOnTradeComplete) Check(t m.TradeType) (ProductInfo, bool) {
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if t == m.TradeTypeRecharge {
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return &RechargeProductInfo{}, true
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}
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return nil, false
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}
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func (u UserOnTradeComplete) OnTradeComplete(info ProductInfo, trade *m.Trade) error {
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return User.UpdateBalanceByTrade(trade.UserID, info.(*RechargeProductInfo), trade)
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}
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