暂存一下,防止丢失
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297
internal/application/wallet/reservation.go
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297
internal/application/wallet/reservation.go
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@@ -0,0 +1,297 @@
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package wallet
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import (
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"context"
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"strconv"
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"time"
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domainwallet "github.com/break/junhong_cmp_fiber/internal/domain/wallet"
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"github.com/break/junhong_cmp_fiber/internal/model"
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"github.com/break/junhong_cmp_fiber/pkg/constants"
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"github.com/break/junhong_cmp_fiber/pkg/errors"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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)
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// ReservationCommand 描述一次具有稳定业务引用的代理主钱包预占操作。
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type ReservationCommand struct {
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ShopID uint
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Amount int64
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ReferenceType string
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ReferenceID uint
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UserID uint
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Creator uint
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Subtype string
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RelatedShopID *uint
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AssetType string
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AssetID uint
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AssetIdentifier string
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Remark string
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RequestID string
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CorrelationID string
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}
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// ReservationEvent 是代理主钱包预占状态变化事件。
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type ReservationEvent struct {
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EventID string `json:"event_id"`
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ReservationID uint `json:"reservation_id"`
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WalletID uint `json:"wallet_id"`
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ShopID uint `json:"shop_id"`
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Amount int64 `json:"amount"`
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Status int `json:"status"`
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ReferenceType string `json:"reference_type"`
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ReferenceID uint `json:"reference_id"`
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OccurredAt time.Time `json:"occurred_at"`
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RequestID string `json:"request_id,omitempty"`
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CorrelationID string `json:"correlation_id,omitempty"`
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}
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// ReservationEventWriter 在业务事务内追加预占状态事件。
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type ReservationEventWriter interface {
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Append(ctx context.Context, tx *gorm.DB, event ReservationEvent) error
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}
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// ReservationService 统一代理主钱包冻结、释放与完成扣除。
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type ReservationService struct {
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reservationEvents ReservationEventWriter
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debitEvents DebitEventWriter
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now func() time.Time
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}
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// NewReservationService 创建代理主钱包预占服务。
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func NewReservationService(reservationEvents ReservationEventWriter, debitEvents DebitEventWriter, now func() time.Time) *ReservationService {
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if now == nil {
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now = time.Now
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}
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return &ReservationService{reservationEvents: reservationEvents, debitEvents: debitEvents, now: now}
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}
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// FreezeInTx 在调用方事务内冻结资金并创建唯一预占事实。
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func (s *ReservationService) FreezeInTx(ctx context.Context, tx *gorm.DB, command ReservationCommand) error {
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if err := s.validateFreeze(tx, command); err != nil {
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return err
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}
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wallet, aggregate, err := lockMainWallet(ctx, tx, command.ShopID)
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if err != nil {
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return err
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}
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existing, err := findReservation(ctx, tx, command.ReferenceType, command.ReferenceID, false)
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if err != nil {
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return err
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}
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if existing != nil {
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if existing.AgentWalletID == wallet.ID && existing.Amount == command.Amount && existing.Status == constants.AgentWalletReservationStatusFrozen {
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return nil
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}
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return errors.New(errors.CodeConflict, "业务引用已存在不一致的钱包预占")
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}
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if err := aggregate.Freeze(command.Amount); err != nil {
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return err
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}
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now := s.now().UTC()
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if err := updateWalletFunds(ctx, tx, wallet, aggregate, now); err != nil {
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return err
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}
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reservation := &model.AgentWalletReservation{
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AgentWalletID: wallet.ID, ShopID: wallet.ShopID, Amount: command.Amount,
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Status: constants.AgentWalletReservationStatusFrozen,
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ReferenceType: command.ReferenceType, ReferenceID: command.ReferenceID, Creator: command.Creator,
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ShopIDTag: wallet.ShopIDTag, EnterpriseIDTag: wallet.EnterpriseIDTag,
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}
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if err := tx.WithContext(ctx).Create(reservation).Error; err != nil {
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return errors.Wrap(errors.CodeDatabaseError, err, "创建代理主钱包预占事实失败")
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}
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return s.appendReservationEvent(ctx, tx, reservation, now, command)
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}
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// ReleaseInTx 幂等释放处于冻结状态的资金预占。
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func (s *ReservationService) ReleaseInTx(ctx context.Context, tx *gorm.DB, command ReservationCommand) error {
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return s.finish(ctx, tx, command, constants.AgentWalletReservationStatusReleased)
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}
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// CompleteInTx 完成冻结资金扣除并创建真实扣款流水与扣款事件。
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func (s *ReservationService) CompleteInTx(ctx context.Context, tx *gorm.DB, command ReservationCommand) error {
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return s.finish(ctx, tx, command, constants.AgentWalletReservationStatusCompleted)
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}
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func (s *ReservationService) finish(ctx context.Context, tx *gorm.DB, command ReservationCommand, targetStatus int) error {
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if err := s.validateFinish(tx, command); err != nil {
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return err
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}
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reservation, err := findReservation(ctx, tx, command.ReferenceType, command.ReferenceID, true)
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if err != nil {
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return err
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}
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if reservation == nil {
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return errors.New(errors.CodeNotFound, "代理主钱包预占事实不存在")
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}
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if (command.ShopID > 0 && reservation.ShopID != command.ShopID) || (command.Amount > 0 && reservation.Amount != command.Amount) {
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return errors.New(errors.CodeConflict, "钱包预占事实与请求不一致")
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}
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command.ShopID = reservation.ShopID
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command.Amount = reservation.Amount
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if reservation.Status == targetStatus {
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return nil
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}
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if reservation.Status != constants.AgentWalletReservationStatusFrozen {
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return errors.New(errors.CodeInvalidStatus, "钱包预占已经进入其他终态")
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}
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wallet, aggregate, err := lockMainWallet(ctx, tx, command.ShopID)
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if err != nil {
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return err
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}
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if wallet.ID != reservation.AgentWalletID {
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return errors.New(errors.CodeConflict, "钱包预占归属不一致")
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}
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if targetStatus == constants.AgentWalletReservationStatusReleased {
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err = aggregate.Release(command.Amount)
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} else {
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err = aggregate.CompleteReserved(command.Amount)
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}
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if err != nil {
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return err
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}
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now := s.now().UTC()
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if err := updateWalletFunds(ctx, tx, wallet, aggregate, now); err != nil {
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return err
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}
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result := tx.WithContext(ctx).Model(&model.AgentWalletReservation{}).
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Where("id = ? AND status = ?", reservation.ID, constants.AgentWalletReservationStatusFrozen).
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Updates(map[string]any{"status": targetStatus, "completed_at": now, "updated_at": now})
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if result.Error != nil {
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return errors.Wrap(errors.CodeDatabaseError, result.Error, "更新代理主钱包预占状态失败")
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}
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if result.RowsAffected != 1 {
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return errors.New(errors.CodeConflict, "钱包预占状态已变化")
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}
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reservation.Status = targetStatus
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reservation.CompletedAt = &now
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if targetStatus == constants.AgentWalletReservationStatusCompleted {
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if err := s.createCompletedDebit(ctx, tx, wallet, aggregate, command, now); err != nil {
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return err
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}
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}
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return s.appendReservationEvent(ctx, tx, reservation, now, command)
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}
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func (s *ReservationService) validateConfigured(tx *gorm.DB) error {
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if s == nil || s.reservationEvents == nil || s.debitEvents == nil || tx == nil {
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return errors.New(errors.CodeInternalError, "代理主钱包预占能力未完整配置")
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}
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return nil
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}
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func (s *ReservationService) validateFreeze(tx *gorm.DB, command ReservationCommand) error {
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if err := s.validateConfigured(tx); err != nil {
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return err
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}
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if command.ShopID == 0 || command.ReferenceType != constants.ReferenceTypeOrder || command.ReferenceID == 0 || command.Amount <= 0 {
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return errors.New(errors.CodeInvalidParam, "代理主钱包预占参数无效")
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}
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return nil
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}
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func (s *ReservationService) validateFinish(tx *gorm.DB, command ReservationCommand) error {
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if err := s.validateConfigured(tx); err != nil {
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return err
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}
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if command.ReferenceType != constants.ReferenceTypeOrder || command.ReferenceID == 0 || command.Amount < 0 {
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return errors.New(errors.CodeInvalidParam, "代理主钱包预占参数无效")
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}
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return nil
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}
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func lockMainWallet(ctx context.Context, tx *gorm.DB, shopID uint) (model.AgentWallet, *domainwallet.AgentWallet, error) {
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var wallet model.AgentWallet
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if err := tx.WithContext(ctx).Clauses(clause.Locking{Strength: "UPDATE"}).
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Where("shop_id = ? AND wallet_type = ?", shopID, constants.AgentWalletTypeMain).First(&wallet).Error; err != nil {
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if err == gorm.ErrRecordNotFound {
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return wallet, nil, errors.New(errors.CodeWalletNotFound, "代理主钱包不存在")
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}
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return wallet, nil, errors.Wrap(errors.CodeDatabaseError, err, "锁定代理主钱包失败")
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}
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aggregate := &domainwallet.AgentWallet{
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ID: wallet.ID, ShopID: wallet.ShopID, WalletType: wallet.WalletType,
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Balance: wallet.Balance, FrozenBalance: wallet.FrozenBalance,
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CreditEnabled: wallet.CreditEnabled, CreditLimit: wallet.CreditLimit,
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Status: wallet.Status, Version: wallet.Version,
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}
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return wallet, aggregate, nil
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}
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func findReservation(ctx context.Context, tx *gorm.DB, referenceType string, referenceID uint, lock bool) (*model.AgentWalletReservation, error) {
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var reservation model.AgentWalletReservation
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query := tx.WithContext(ctx)
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if lock {
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query = query.Clauses(clause.Locking{Strength: "UPDATE"})
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}
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err := query.Where("reference_type = ? AND reference_id = ?", referenceType, referenceID).First(&reservation).Error
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if err == nil {
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return &reservation, nil
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}
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if err == gorm.ErrRecordNotFound {
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return nil, nil
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}
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return nil, errors.Wrap(errors.CodeDatabaseError, err, "查询代理主钱包预占事实失败")
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}
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func updateWalletFunds(ctx context.Context, tx *gorm.DB, stored model.AgentWallet, aggregate *domainwallet.AgentWallet, now time.Time) error {
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result := tx.WithContext(ctx).Model(&model.AgentWallet{}).
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Where("id = ? AND wallet_type = ? AND status = ? AND version = ?", stored.ID, constants.AgentWalletTypeMain, constants.AgentWalletStatusNormal, stored.Version).
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Updates(map[string]any{
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"balance": aggregate.Balance, "frozen_balance": aggregate.FrozenBalance,
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"version": gorm.Expr("version + 1"), "updated_at": now,
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})
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if result.Error != nil {
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return errors.Wrap(errors.CodeDatabaseError, result.Error, "更新代理主钱包预占资金失败")
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}
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if result.RowsAffected != 1 {
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return errors.New(errors.CodeConflict, "钱包版本已变化，请重试")
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}
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return nil
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}
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func (s *ReservationService) createCompletedDebit(ctx context.Context, tx *gorm.DB, stored model.AgentWallet, aggregate *domainwallet.AgentWallet, command ReservationCommand, now time.Time) error {
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referenceType := command.ReferenceType
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transaction := &model.AgentWalletTransaction{
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AgentWalletID: stored.ID, ShopID: stored.ShopID, UserID: command.UserID,
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TransactionType: constants.AgentTransactionTypeDeduct, Amount: -command.Amount,
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BalanceBefore: stored.Balance, BalanceAfter: aggregate.Balance,
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Status: constants.TransactionStatusSuccess, ReferenceType: &referenceType, ReferenceID: &command.ReferenceID,
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RelatedShopID: command.RelatedShopID, AssetType: command.AssetType, AssetID: command.AssetID,
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AssetIdentifier: command.AssetIdentifier, Remark: &command.Remark, Creator: command.Creator,
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ShopIDTag: stored.ShopIDTag, EnterpriseIDTag: stored.EnterpriseIDTag,
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}
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if command.Subtype != "" {
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transaction.TransactionSubtype = &command.Subtype
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}
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if err := tx.WithContext(ctx).Create(transaction).Error; err != nil {
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return errors.Wrap(errors.CodeDatabaseError, err, "创建冻结资金扣款流水失败")
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}
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event := DebitedEvent{
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EventID: "agent-wallet:order:" + strconv.FormatUint(uint64(command.ReferenceID), 10) + ":debited",
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WalletID: stored.ID, ShopID: stored.ShopID, Amount: command.Amount,
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BalanceBefore: stored.Balance, BalanceAfter: aggregate.Balance, Version: stored.Version + 1,
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ReferenceType: command.ReferenceType, ReferenceID: command.ReferenceID,
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TransactionType: constants.AgentTransactionTypeDeduct, OccurredAt: now,
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RequestID: command.RequestID, CorrelationID: command.CorrelationID,
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}
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if err := s.debitEvents.Append(ctx, tx, event); err != nil {
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return errors.Wrap(errors.CodeDatabaseError, err, "写入冻结资金扣款事件失败")
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}
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return nil
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}
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func (s *ReservationService) appendReservationEvent(ctx context.Context, tx *gorm.DB, reservation *model.AgentWalletReservation, now time.Time, command ReservationCommand) error {
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event := ReservationEvent{
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EventID: "agent-wallet-reservation:" + strconv.FormatUint(uint64(reservation.ID), 10) + ":" + strconv.Itoa(reservation.Status),
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ReservationID: reservation.ID, WalletID: reservation.AgentWalletID, ShopID: reservation.ShopID,
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Amount: reservation.Amount, Status: reservation.Status,
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ReferenceType: reservation.ReferenceType, ReferenceID: reservation.ReferenceID,
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OccurredAt: now, RequestID: command.RequestID, CorrelationID: command.CorrelationID,
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}
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if err := s.reservationEvents.Append(ctx, tx, event); err != nil {
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return errors.Wrap(errors.CodeDatabaseError, err, "写入代理主钱包预占事件失败")
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}
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return nil
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}
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