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289
internal/application/wallet/refund.go
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289
internal/application/wallet/refund.go
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package wallet
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import (
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"context"
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"math"
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"strconv"
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"strings"
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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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// RefundCommand 描述一次沿订单原扣款回溯的代理主钱包退款。
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type RefundCommand struct {
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OrderID uint
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RefundID uint
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Amount int64
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LegacyPayerShopID uint
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LegacyDeductAmount int64
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LegacyRelatedShopID *uint
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AssetType string
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AssetID uint
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AssetIdentifier string
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UserID uint
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Creator uint
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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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// RefundResult 返回代理主钱包退款后的资金快照。
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type RefundResult struct {
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WalletID uint
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BalanceBefore int64
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BalanceAfter int64
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Version int
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AlreadyApplied bool
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}
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// RefundedEvent 是代理主钱包订单退款成功后的可靠资金事实。
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type RefundedEvent struct {
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EventID string `json:"event_id"`
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WalletID uint `json:"wallet_id"`
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ShopID uint `json:"shop_id"`
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OrderID uint `json:"order_id"`
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RefundID uint `json:"refund_id"`
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Amount int64 `json:"amount"`
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BalanceBefore int64 `json:"balance_before"`
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BalanceAfter int64 `json:"balance_after"`
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Version int `json:"version"`
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OriginalDebitTransactionID uint `json:"original_debit_transaction_id,omitempty"`
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OriginalDeductAmount int64 `json:"original_deduct_amount"`
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RelatedShopID *uint `json:"related_shop_id,omitempty"`
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TransactionSubtype *string `json:"transaction_subtype,omitempty"`
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AssetType string `json:"asset_type,omitempty"`
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AssetID uint `json:"asset_id,omitempty"`
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AssetIdentifier string `json:"asset_identifier,omitempty"`
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Legacy bool `json:"legacy"`
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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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// RefundEventWriter 在调用方事务内追加代理主钱包退款事件。
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type RefundEventWriter interface {
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Append(ctx context.Context, tx *gorm.DB, event RefundedEvent) error
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}
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// RefundService 统一代理订单退款回充、真实流水和可靠事件。
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type RefundService struct {
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eventWriter RefundEventWriter
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now func() time.Time
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}
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// NewRefundService 创建统一代理主钱包退款服务。
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func NewRefundService(eventWriter RefundEventWriter, now func() time.Time) *RefundService {
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if now == nil {
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now = time.Now
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}
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return &RefundService{eventWriter: eventWriter, now: now}
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}
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// RefundInTx 在调用方事务内按原扣款事实完成退款回充、版本递增、唯一流水和 Outbox。
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func (s *RefundService) RefundInTx(ctx context.Context, tx *gorm.DB, command RefundCommand) (RefundResult, error) {
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if s == nil || s.eventWriter == nil || tx == nil {
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return RefundResult{}, errors.New(errors.CodeInternalError, "代理主钱包退款能力未完整配置")
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}
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if err := validateRefundCommand(command); err != nil {
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return RefundResult{}, err
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}
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origin, err := findOriginalOrderDebit(ctx, tx, command.OrderID)
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if err != nil {
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return RefundResult{}, err
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}
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resolution, err := resolveRefundTarget(command, origin)
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if err != nil {
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return RefundResult{}, err
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}
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stored, err := lockRefundWallet(ctx, tx, resolution)
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if err != nil {
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return RefundResult{}, err
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}
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existing, err := findExistingRefund(ctx, tx, command.RefundID)
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if err != nil {
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return RefundResult{}, err
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}
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if existing != nil {
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if existing.AgentWalletID != stored.ID || existing.Amount != command.Amount ||
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!sameOptionalUint(existing.RelatedShopID, resolution.relatedShopID) ||
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!sameOptionalString(existing.TransactionSubtype, resolution.subtype) ||
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existing.AssetType != resolution.assetType || existing.AssetID != resolution.assetID ||
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existing.AssetIdentifier != resolution.assetIdentifier {
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return RefundResult{}, errors.New(errors.CodeConflict, "退款单已存在不一致的钱包回充流水")
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}
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return RefundResult{
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WalletID: stored.ID, BalanceBefore: existing.BalanceBefore, BalanceAfter: existing.BalanceAfter,
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Version: stored.Version, AlreadyApplied: true,
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}, nil
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}
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aggregate := domainwallet.AgentWallet{
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ID: stored.ID, ShopID: stored.ShopID, WalletType: stored.WalletType,
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Balance: stored.Balance, FrozenBalance: stored.FrozenBalance,
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CreditEnabled: stored.CreditEnabled, CreditLimit: stored.CreditLimit,
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Status: stored.Status, Version: stored.Version,
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}
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if err := aggregate.Credit(command.Amount); err != nil {
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return RefundResult{}, err
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}
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now := s.now().UTC()
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update := tx.WithContext(ctx).Model(&model.AgentWallet{}).
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Where("id = ? AND wallet_type = ? AND status = ? AND version = ?",
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stored.ID, constants.AgentWalletTypeMain, constants.AgentWalletStatusNormal, stored.Version).
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Updates(map[string]any{"balance": aggregate.Balance, "version": gorm.Expr("version + 1"), "updated_at": now})
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if update.Error != nil {
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return RefundResult{}, errors.Wrap(errors.CodeDatabaseError, update.Error, "退回代理主钱包余额失败")
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}
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if update.RowsAffected != 1 {
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return RefundResult{}, errors.New(errors.CodeConflict, "钱包版本已变化，请重试")
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}
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transaction := buildRefundTransaction(stored, aggregate.Balance, command, resolution)
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if err := tx.WithContext(ctx).Create(transaction).Error; err != nil {
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return RefundResult{}, errors.Wrap(errors.CodeDatabaseError, err, "创建代理主钱包退款流水失败")
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}
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event := RefundedEvent{
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EventID: "agent-wallet:refund:" + strconv.FormatUint(uint64(command.RefundID), 10) + ":refunded",
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WalletID: stored.ID, ShopID: stored.ShopID, OrderID: command.OrderID, RefundID: command.RefundID,
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Amount: command.Amount, BalanceBefore: stored.Balance, BalanceAfter: aggregate.Balance,
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Version: stored.Version + 1, OriginalDebitTransactionID: resolution.originalDebitID,
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OriginalDeductAmount: resolution.deductAmount,
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RelatedShopID: resolution.relatedShopID, TransactionSubtype: resolution.subtype, Legacy: resolution.legacy,
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AssetType: resolution.assetType, AssetID: resolution.assetID, AssetIdentifier: resolution.assetIdentifier,
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OccurredAt: now, RequestID: command.RequestID, CorrelationID: command.CorrelationID,
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}
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if err := s.eventWriter.Append(ctx, tx, event); err != nil {
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return RefundResult{}, errors.Wrap(errors.CodeDatabaseError, err, "写入代理主钱包退款事件失败")
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}
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return RefundResult{
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WalletID: stored.ID, BalanceBefore: stored.Balance, BalanceAfter: aggregate.Balance,
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Version: stored.Version + 1,
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}, nil
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}
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type refundResolution struct {
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walletID uint
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shopID uint
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originalDebitID uint
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deductAmount int64
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relatedShopID *uint
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subtype *string
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assetType string
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assetID uint
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assetIdentifier string
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legacy bool
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}
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func validateRefundCommand(command RefundCommand) error {
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if command.OrderID == 0 || command.RefundID == 0 || command.Amount <= 0 {
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return errors.New(errors.CodeInvalidParam, "代理主钱包退款参数无效")
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}
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return nil
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}
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func findOriginalOrderDebit(ctx context.Context, tx *gorm.DB, orderID uint) (*model.AgentWalletTransaction, error) {
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var transaction model.AgentWalletTransaction
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err := tx.WithContext(ctx).Unscoped().
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Where("reference_type = ? AND reference_id = ? AND transaction_type = ? AND status = ?",
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constants.ReferenceTypeOrder, orderID, constants.AgentTransactionTypeDeduct, constants.TransactionStatusSuccess).
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Order("id ASC").First(&transaction).Error
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if err == nil {
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return &transaction, 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, "查询原代理主钱包扣款流水失败")
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}
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func resolveRefundTarget(command RefundCommand, origin *model.AgentWalletTransaction) (refundResolution, error) {
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if origin != nil {
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if origin.Amount >= 0 || origin.Amount == math.MinInt64 {
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return refundResolution{}, errors.New(errors.CodeInternalError, "原代理主钱包扣款流水金额非法")
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}
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maxAmount := -origin.Amount
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if command.Amount > maxAmount {
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return refundResolution{}, errors.New(errors.CodeInvalidParam, "退款金额不能大于原钱包扣款金额")
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}
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return refundResolution{
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walletID: origin.AgentWalletID, originalDebitID: origin.ID, deductAmount: maxAmount,
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relatedShopID: origin.RelatedShopID, subtype: origin.TransactionSubtype,
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assetType: origin.AssetType, assetID: origin.AssetID, assetIdentifier: origin.AssetIdentifier,
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}, nil
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}
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if command.LegacyPayerShopID == 0 || command.LegacyDeductAmount <= 0 {
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return refundResolution{}, errors.New(errors.CodeInternalError, "历史订单缺少原扣款流水和兼容付款快照")
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}
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if command.Amount > command.LegacyDeductAmount {
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return refundResolution{}, errors.New(errors.CodeInvalidParam, "退款金额不能大于历史订单实付金额")
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}
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return refundResolution{
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shopID: command.LegacyPayerShopID, relatedShopID: command.LegacyRelatedShopID,
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deductAmount: command.LegacyDeductAmount,
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assetType: command.AssetType, assetID: command.AssetID, assetIdentifier: command.AssetIdentifier,
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legacy: true,
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}, nil
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}
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func lockRefundWallet(ctx context.Context, tx *gorm.DB, resolution refundResolution) (model.AgentWallet, error) {
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var stored model.AgentWallet
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query := tx.WithContext(ctx).Clauses(clause.Locking{Strength: "UPDATE"}).
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Where("wallet_type = ?", constants.AgentWalletTypeMain)
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if resolution.walletID > 0 {
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query = query.Where("id = ?", resolution.walletID)
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} else {
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query = query.Where("shop_id = ?", resolution.shopID)
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}
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if err := query.First(&stored).Error; err != nil {
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if err == gorm.ErrRecordNotFound {
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return model.AgentWallet{}, errors.New(errors.CodeWalletNotFound, "代理主钱包不存在")
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}
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return model.AgentWallet{}, errors.Wrap(errors.CodeDatabaseError, err, "锁定代理主钱包失败")
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}
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return stored, nil
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}
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func findExistingRefund(ctx context.Context, tx *gorm.DB, refundID uint) (*model.AgentWalletTransaction, error) {
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var transaction model.AgentWalletTransaction
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err := tx.WithContext(ctx).Unscoped().
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Where("reference_type = ? AND reference_id = ? AND transaction_type = ? AND status = ?",
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constants.ReferenceTypeRefund, refundID, constants.AgentTransactionTypeRefund, constants.TransactionStatusSuccess).
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First(&transaction).Error
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if err == nil {
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return &transaction, 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, "查询代理主钱包退款流水失败")
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}
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func buildRefundTransaction(stored model.AgentWallet, balanceAfter int64, command RefundCommand, resolution refundResolution) *model.AgentWalletTransaction {
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referenceType := constants.ReferenceTypeRefund
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remark := strings.TrimSpace(command.Remark)
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return &model.AgentWalletTransaction{
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AgentWalletID: stored.ID, ShopID: stored.ShopID, UserID: command.UserID,
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TransactionType: constants.AgentTransactionTypeRefund, TransactionSubtype: resolution.subtype,
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Amount: command.Amount, BalanceBefore: stored.Balance, BalanceAfter: balanceAfter,
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Status: constants.TransactionStatusSuccess, ReferenceType: &referenceType, ReferenceID: &command.RefundID,
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RelatedShopID: resolution.relatedShopID, AssetType: resolution.assetType, AssetID: resolution.assetID,
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AssetIdentifier: resolution.assetIdentifier, Remark: &remark, Creator: command.Creator,
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ShopIDTag: stored.ShopIDTag, EnterpriseIDTag: stored.EnterpriseIDTag,
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}
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}
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func sameOptionalUint(left, right *uint) bool {
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return (left == nil && right == nil) || (left != nil && right != nil && *left == *right)
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}
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func sameOptionalString(left, right *string) bool {
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return (left == nil && right == nil) || (left != nil && right != nil && *left == *right)
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}
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