feat(payment): add complete payment system with multi-provider support
Add a full payment and subscription system supporting EasyPay (Alipay/WeChat), Stripe, and direct Alipay/WeChat Pay providers with multi-instance load balancing.
This commit is contained in:
erio
@@ -0,0 +1,325 @@
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package service
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import (
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"context"
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"fmt"
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"log/slog"
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"math"
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"strconv"
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"strings"
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"time"
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dbent "github.com/Wei-Shaw/sub2api/ent"
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"github.com/Wei-Shaw/sub2api/ent/paymentauditlog"
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"github.com/Wei-Shaw/sub2api/ent/paymentorder"
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"github.com/Wei-Shaw/sub2api/internal/payment"
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infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
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)
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// --- Payment Notification & Fulfillment ---
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func (s *PaymentService) HandlePaymentNotification(ctx context.Context, n *payment.PaymentNotification, pk string) error {
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if n.Status != payment.NotificationStatusSuccess {
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return nil
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}
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// Look up order by out_trade_no (the external order ID we sent to the provider)
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order, err := s.entClient.PaymentOrder.Query().Where(paymentorder.OutTradeNo(n.OrderID)).Only(ctx)
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if err != nil {
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// Fallback: try legacy format (sub2_N where N is DB ID)
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trimmed := strings.TrimPrefix(n.OrderID, orderIDPrefix)
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if oid, parseErr := strconv.ParseInt(trimmed, 10, 64); parseErr == nil {
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return s.confirmPayment(ctx, oid, n.TradeNo, n.Amount, pk)
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}
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return fmt.Errorf("order not found for out_trade_no: %s", n.OrderID)
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}
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return s.confirmPayment(ctx, order.ID, n.TradeNo, n.Amount, pk)
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}
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func (s *PaymentService) confirmPayment(ctx context.Context, oid int64, tradeNo string, paid float64, pk string) error {
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o, err := s.entClient.PaymentOrder.Get(ctx, oid)
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if err != nil {
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slog.Error("order not found", "orderID", oid)
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return nil
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}
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// Skip amount check when paid=0 (e.g. QueryOrder doesn't return amount).
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// Also skip if paid is NaN/Inf (malformed provider data).
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if paid > 0 && !math.IsNaN(paid) && !math.IsInf(paid, 0) {
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if math.Abs(paid-o.PayAmount) > amountToleranceCNY {
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s.writeAuditLog(ctx, o.ID, "PAYMENT_AMOUNT_MISMATCH", pk, map[string]any{"expected": o.PayAmount, "paid": paid, "tradeNo": tradeNo})
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return fmt.Errorf("amount mismatch: expected %.2f, got %.2f", o.PayAmount, paid)
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}
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}
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// Use order's expected amount when provider didn't report one
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if paid <= 0 || math.IsNaN(paid) || math.IsInf(paid, 0) {
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paid = o.PayAmount
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}
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return s.toPaid(ctx, o, tradeNo, paid, pk)
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}
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func (s *PaymentService) toPaid(ctx context.Context, o *dbent.PaymentOrder, tradeNo string, paid float64, pk string) error {
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previousStatus := o.Status
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now := time.Now()
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grace := now.Add(-paymentGraceMinutes * time.Minute)
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c, err := s.entClient.PaymentOrder.Update().Where(
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paymentorder.IDEQ(o.ID),
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paymentorder.Or(
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paymentorder.StatusEQ(OrderStatusPending),
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paymentorder.StatusEQ(OrderStatusCancelled),
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paymentorder.And(
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paymentorder.StatusEQ(OrderStatusExpired),
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paymentorder.UpdatedAtGTE(grace),
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),
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),
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).SetStatus(OrderStatusPaid).SetPayAmount(paid).SetPaymentTradeNo(tradeNo).SetPaidAt(now).ClearFailedAt().ClearFailedReason().Save(ctx)
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if err != nil {
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return fmt.Errorf("update to PAID: %w", err)
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}
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if c == 0 {
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return s.alreadyProcessed(ctx, o)
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}
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if previousStatus == OrderStatusCancelled || previousStatus == OrderStatusExpired {
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slog.Info("order recovered from webhook payment success",
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"orderID", o.ID,
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"previousStatus", previousStatus,
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"tradeNo", tradeNo,
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"provider", pk,
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)
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s.writeAuditLog(ctx, o.ID, "ORDER_RECOVERED", pk, map[string]any{
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"previous_status": previousStatus,
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"tradeNo": tradeNo,
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"paidAmount": paid,
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"reason": "webhook payment success received after order " + previousStatus,
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})
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}
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s.writeAuditLog(ctx, o.ID, "ORDER_PAID", pk, map[string]any{"tradeNo": tradeNo, "paidAmount": paid})
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return s.executeFulfillment(ctx, o.ID)
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}
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func (s *PaymentService) alreadyProcessed(ctx context.Context, o *dbent.PaymentOrder) error {
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cur, err := s.entClient.PaymentOrder.Get(ctx, o.ID)
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if err != nil {
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return nil
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}
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switch cur.Status {
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case OrderStatusCompleted, OrderStatusRefunded:
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return nil
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case OrderStatusFailed:
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return s.executeFulfillment(ctx, o.ID)
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case OrderStatusPaid, OrderStatusRecharging:
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return fmt.Errorf("order %d is being processed", o.ID)
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case OrderStatusExpired:
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slog.Warn("webhook payment success for expired order beyond grace period",
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"orderID", o.ID,
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"status", cur.Status,
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"updatedAt", cur.UpdatedAt,
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)
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s.writeAuditLog(ctx, o.ID, "PAYMENT_AFTER_EXPIRY", "system", map[string]any{
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"status": cur.Status,
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"updatedAt": cur.UpdatedAt,
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"reason": "payment arrived after expiry grace period",
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})
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return nil
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default:
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return nil
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}
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}
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func (s *PaymentService) executeFulfillment(ctx context.Context, oid int64) error {
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o, err := s.entClient.PaymentOrder.Get(ctx, oid)
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if err != nil {
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return fmt.Errorf("get order: %w", err)
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}
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if o.OrderType == payment.OrderTypeSubscription {
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return s.ExecuteSubscriptionFulfillment(ctx, oid)
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}
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return s.ExecuteBalanceFulfillment(ctx, oid)
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}
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func (s *PaymentService) ExecuteBalanceFulfillment(ctx context.Context, oid int64) error {
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o, err := s.entClient.PaymentOrder.Get(ctx, oid)
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if err != nil {
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return infraerrors.NotFound("NOT_FOUND", "order not found")
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}
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if o.Status == OrderStatusCompleted {
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return nil
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}
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if psIsRefundStatus(o.Status) {
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return infraerrors.BadRequest("INVALID_STATUS", "refund-related order cannot fulfill")
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}
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if o.Status != OrderStatusPaid && o.Status != OrderStatusFailed {
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return infraerrors.BadRequest("INVALID_STATUS", "order cannot fulfill in status "+o.Status)
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}
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c, err := s.entClient.PaymentOrder.Update().Where(paymentorder.IDEQ(oid), paymentorder.StatusIn(OrderStatusPaid, OrderStatusFailed)).SetStatus(OrderStatusRecharging).Save(ctx)
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if err != nil {
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return fmt.Errorf("lock: %w", err)
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}
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if c == 0 {
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return nil
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}
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if err := s.doBalance(ctx, o); err != nil {
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s.markFailed(ctx, oid, err)
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return err
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}
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return nil
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}
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// redeemAction represents the idempotency decision for balance fulfillment.
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type redeemAction int
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const (
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// redeemActionCreate: code does not exist — create it, then redeem.
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redeemActionCreate redeemAction = iota
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// redeemActionRedeem: code exists but is unused — skip creation, redeem only.
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redeemActionRedeem
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// redeemActionSkipCompleted: code exists and is already used — skip to mark completed.
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redeemActionSkipCompleted
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)
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// resolveRedeemAction decides the idempotency action based on an existing redeem code lookup.
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// existing is the result of GetByCode; lookupErr is the error from that call.
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func resolveRedeemAction(existing *RedeemCode, lookupErr error) redeemAction {
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if existing == nil || lookupErr != nil {
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return redeemActionCreate
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}
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if existing.IsUsed() {
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return redeemActionSkipCompleted
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}
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return redeemActionRedeem
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}
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func (s *PaymentService) doBalance(ctx context.Context, o *dbent.PaymentOrder) error {
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// Idempotency: check if redeem code already exists (from a previous partial run)
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existing, lookupErr := s.redeemService.GetByCode(ctx, o.RechargeCode)
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action := resolveRedeemAction(existing, lookupErr)
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switch action {
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case redeemActionSkipCompleted:
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// Code already created and redeemed — just mark completed
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return s.markCompleted(ctx, o, "RECHARGE_SUCCESS")
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case redeemActionCreate:
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rc := &RedeemCode{Code: o.RechargeCode, Type: RedeemTypeBalance, Value: o.Amount, Status: StatusUnused}
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if err := s.redeemService.CreateCode(ctx, rc); err != nil {
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return fmt.Errorf("create redeem code: %w", err)
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}
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case redeemActionRedeem:
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// Code exists but unused — skip creation, proceed to redeem
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}
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if _, err := s.redeemService.Redeem(ctx, o.UserID, o.RechargeCode); err != nil {
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return fmt.Errorf("redeem balance: %w", err)
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}
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return s.markCompleted(ctx, o, "RECHARGE_SUCCESS")
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}
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func (s *PaymentService) markCompleted(ctx context.Context, o *dbent.PaymentOrder, auditAction string) error {
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now := time.Now()
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_, err := s.entClient.PaymentOrder.Update().Where(paymentorder.IDEQ(o.ID), paymentorder.StatusEQ(OrderStatusRecharging)).SetStatus(OrderStatusCompleted).SetCompletedAt(now).Save(ctx)
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if err != nil {
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return fmt.Errorf("mark completed: %w", err)
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}
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s.writeAuditLog(ctx, o.ID, auditAction, "system", map[string]any{"rechargeCode": o.RechargeCode, "amount": o.Amount})
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return nil
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}
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func (s *PaymentService) ExecuteSubscriptionFulfillment(ctx context.Context, oid int64) error {
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o, err := s.entClient.PaymentOrder.Get(ctx, oid)
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if err != nil {
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return infraerrors.NotFound("NOT_FOUND", "order not found")
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}
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if o.Status == OrderStatusCompleted {
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return nil
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}
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if psIsRefundStatus(o.Status) {
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return infraerrors.BadRequest("INVALID_STATUS", "refund-related order cannot fulfill")
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}
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if o.Status != OrderStatusPaid && o.Status != OrderStatusFailed {
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return infraerrors.BadRequest("INVALID_STATUS", "order cannot fulfill in status "+o.Status)
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}
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if o.SubscriptionGroupID == nil || o.SubscriptionDays == nil {
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return infraerrors.BadRequest("INVALID_STATUS", "missing subscription info")
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}
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c, err := s.entClient.PaymentOrder.Update().Where(paymentorder.IDEQ(oid), paymentorder.StatusIn(OrderStatusPaid, OrderStatusFailed)).SetStatus(OrderStatusRecharging).Save(ctx)
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if err != nil {
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return fmt.Errorf("lock: %w", err)
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}
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if c == 0 {
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return nil
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}
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if err := s.doSub(ctx, o); err != nil {
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s.markFailed(ctx, oid, err)
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return err
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}
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return nil
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}
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func (s *PaymentService) doSub(ctx context.Context, o *dbent.PaymentOrder) error {
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gid := *o.SubscriptionGroupID
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days := *o.SubscriptionDays
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g, err := s.groupRepo.GetByID(ctx, gid)
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if err != nil || g.Status != payment.EntityStatusActive {
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return fmt.Errorf("group %d no longer exists or inactive", gid)
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}
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// Idempotency: check audit log to see if subscription was already assigned.
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// Prevents double-extension on retry after markCompleted fails.
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if s.hasAuditLog(ctx, o.ID, "SUBSCRIPTION_SUCCESS") {
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slog.Info("subscription already assigned for order, skipping", "orderID", o.ID, "groupID", gid)
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return s.markCompleted(ctx, o, "SUBSCRIPTION_SUCCESS")
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}
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orderNote := fmt.Sprintf("payment order %d", o.ID)
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_, _, err = s.subscriptionSvc.AssignOrExtendSubscription(ctx, &AssignSubscriptionInput{UserID: o.UserID, GroupID: gid, ValidityDays: days, AssignedBy: 0, Notes: orderNote})
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if err != nil {
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return fmt.Errorf("assign subscription: %w", err)
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}
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return s.markCompleted(ctx, o, "SUBSCRIPTION_SUCCESS")
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}
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func (s *PaymentService) hasAuditLog(ctx context.Context, orderID int64, action string) bool {
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oid := strconv.FormatInt(orderID, 10)
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c, _ := s.entClient.PaymentAuditLog.Query().
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Where(paymentauditlog.OrderIDEQ(oid), paymentauditlog.ActionEQ(action)).
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Limit(1).Count(ctx)
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return c > 0
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}
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func (s *PaymentService) markFailed(ctx context.Context, oid int64, cause error) {
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now := time.Now()
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r := psErrMsg(cause)
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// Only mark FAILED if still in RECHARGING state — prevents overwriting
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// a COMPLETED order when markCompleted failed but fulfillment succeeded.
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c, e := s.entClient.PaymentOrder.Update().
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Where(paymentorder.IDEQ(oid), paymentorder.StatusEQ(OrderStatusRecharging)).
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SetStatus(OrderStatusFailed).SetFailedAt(now).SetFailedReason(r).Save(ctx)
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if e != nil {
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slog.Error("mark FAILED", "orderID", oid, "error", e)
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}
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if c > 0 {
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s.writeAuditLog(ctx, oid, "FULFILLMENT_FAILED", "system", map[string]any{"reason": r})
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}
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}
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func (s *PaymentService) RetryFulfillment(ctx context.Context, oid int64) error {
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o, err := s.entClient.PaymentOrder.Get(ctx, oid)
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if err != nil {
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return infraerrors.NotFound("NOT_FOUND", "order not found")
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}
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if o.PaidAt == nil {
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return infraerrors.BadRequest("INVALID_STATUS", "order is not paid")
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}
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if psIsRefundStatus(o.Status) {
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return infraerrors.BadRequest("INVALID_STATUS", "refund-related order cannot retry")
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}
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if o.Status == OrderStatusRecharging {
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return infraerrors.Conflict("CONFLICT", "order is being processed")
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}
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if o.Status == OrderStatusCompleted {
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return infraerrors.BadRequest("INVALID_STATUS", "order already completed")
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}
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if o.Status != OrderStatusFailed && o.Status != OrderStatusPaid {
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return infraerrors.BadRequest("INVALID_STATUS", "only paid and failed orders can retry")
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}
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_, err = s.entClient.PaymentOrder.Update().Where(paymentorder.IDEQ(oid), paymentorder.StatusIn(OrderStatusFailed, OrderStatusPaid)).SetStatus(OrderStatusPaid).ClearFailedAt().ClearFailedReason().Save(ctx)
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if err != nil {
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return fmt.Errorf("reset for retry: %w", err)
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}
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s.writeAuditLog(ctx, oid, "RECHARGE_RETRY", "admin", map[string]any{"detail": "admin manual retry"})
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return s.executeFulfillment(ctx, oid)
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}
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