lnd.xprv/lntest/itest/lnd_hold_persistence_test.go

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package itest
import (
"context"
"crypto/rand"
"fmt"
"io"
"sync"
"time"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnrpc/invoicesrpc"
"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
"github.com/lightningnetwork/lnd/lntest"
"github.com/lightningnetwork/lnd/lntest/wait"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/stretchr/testify/require"
)
// testHoldInvoicePersistence tests that a sender to a hold-invoice, can be
// restarted before the payment gets settled, and still be able to receive the
// preimage.
func testHoldInvoicePersistence(net *lntest.NetworkHarness, t *harnessTest) {
ctxb := context.Background()
const (
chanAmt = btcutil.Amount(1000000)
numPayments = 10
)
// Create carol, and clean up when the test finishes.
carol := net.NewNode(t.t, "Carol", nil)
defer shutdownAndAssert(net, t, carol)
// Connect Alice to Carol.
ctxt, _ := context.WithTimeout(ctxb, defaultTimeout)
if err := net.ConnectNodes(ctxb, net.Alice, carol); err != nil {
t.Fatalf("unable to connect alice to carol: %v", err)
}
// Open a channel between Alice and Carol which is private so that we
// cover the addition of hop hints for hold invoices.
ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout)
chanPointAlice := openChannelAndAssert(
ctxt, t, net, net.Alice, carol,
lntest.OpenChannelParams{
Amt: chanAmt,
Private: true,
},
)
// Wait for Alice and Carol to receive the channel edge from the
// funding manager.
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPointAlice)
if err != nil {
t.Fatalf("alice didn't see the alice->carol channel before "+
"timeout: %v", err)
}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
err = carol.WaitForNetworkChannelOpen(ctxt, chanPointAlice)
if err != nil {
t.Fatalf("carol didn't see the carol->alice channel before "+
"timeout: %v", err)
}
// Create preimages for all payments we are going to initiate.
var preimages []lntypes.Preimage
for i := 0; i < numPayments; i++ {
var preimage lntypes.Preimage
_, err = rand.Read(preimage[:])
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
preimages = append(preimages, preimage)
}
// Let Carol create hold-invoices for all the payments.
var (
payAmt = btcutil.Amount(4)
payReqs []string
invoiceStreams []invoicesrpc.Invoices_SubscribeSingleInvoiceClient
)
for _, preimage := range preimages {
payHash := preimage.Hash()
// Make our invoices private so that we get coverage for adding
// hop hints.
invoiceReq := &invoicesrpc.AddHoldInvoiceRequest{
Memo: "testing",
Value: int64(payAmt),
Hash: payHash[:],
Private: true,
}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
resp, err := carol.AddHoldInvoice(ctxt, invoiceReq)
if err != nil {
t.Fatalf("unable to add invoice: %v", err)
}
ctx, cancel := context.WithCancel(ctxb)
defer cancel()
stream, err := carol.SubscribeSingleInvoice(
ctx,
&invoicesrpc.SubscribeSingleInvoiceRequest{
RHash: payHash[:],
},
)
if err != nil {
t.Fatalf("unable to subscribe to invoice: %v", err)
}
invoiceStreams = append(invoiceStreams, stream)
payReqs = append(payReqs, resp.PaymentRequest)
}
// Wait for all the invoices to reach the OPEN state.
for _, stream := range invoiceStreams {
invoice, err := stream.Recv()
if err != nil {
t.Fatalf("err: %v", err)
}
if invoice.State != lnrpc.Invoice_OPEN {
t.Fatalf("expected OPEN, got state: %v", invoice.State)
}
}
// Let Alice initiate payments for all the created invoices.
var paymentStreams []routerrpc.Router_SendPaymentV2Client
for _, payReq := range payReqs {
ctx, cancel := context.WithCancel(ctxb)
defer cancel()
payStream, err := net.Alice.RouterClient.SendPaymentV2(
ctx, &routerrpc.SendPaymentRequest{
PaymentRequest: payReq,
TimeoutSeconds: 60,
FeeLimitSat: 1000000,
},
)
if err != nil {
t.Fatalf("unable to send alice htlc: %v", err)
}
paymentStreams = append(paymentStreams, payStream)
}
// Wait for inlight status update.
for _, payStream := range paymentStreams {
payment, err := payStream.Recv()
if err != nil {
t.Fatalf("Failed receiving status update: %v", err)
}
if payment.Status != lnrpc.Payment_IN_FLIGHT {
t.Fatalf("state not in flight: %v", payment.Status)
}
}
// The payments should now show up in Alice's ListInvoices, with a zero
// preimage, indicating they are not yet settled.
err = wait.NoError(func() error {
req := &lnrpc.ListPaymentsRequest{
IncludeIncomplete: true,
}
ctxt, _ = context.WithTimeout(ctxt, defaultTimeout)
paymentsResp, err := net.Alice.ListPayments(ctxt, req)
if err != nil {
return fmt.Errorf("error when obtaining payments: %v",
err)
}
// Gather the payment hashes we are looking for in the
// response.
payHashes := make(map[string]struct{})
for _, preimg := range preimages {
payHashes[preimg.Hash().String()] = struct{}{}
}
var zeroPreimg lntypes.Preimage
for _, payment := range paymentsResp.Payments {
_, ok := payHashes[payment.PaymentHash]
if !ok {
continue
}
// The preimage should NEVER be non-zero at this point.
if payment.PaymentPreimage != zeroPreimg.String() {
t.Fatalf("expected zero preimage, got %v",
payment.PaymentPreimage)
}
// We wait for the payment attempt to have been
// properly recorded in the DB.
if len(payment.Htlcs) == 0 {
return fmt.Errorf("no attempt recorded")
}
delete(payHashes, payment.PaymentHash)
}
if len(payHashes) != 0 {
return fmt.Errorf("payhash not found in response")
}
return nil
}, defaultTimeout)
if err != nil {
t.Fatalf("predicate not satisfied: %v", err)
}
// Wait for all invoices to be accepted.
for _, stream := range invoiceStreams {
invoice, err := stream.Recv()
if err != nil {
t.Fatalf("err: %v", err)
}
if invoice.State != lnrpc.Invoice_ACCEPTED {
t.Fatalf("expected ACCEPTED, got state: %v",
invoice.State)
}
}
// Restart alice. This to ensure she will still be able to handle
// settling the invoices after a restart.
if err := net.RestartNode(net.Alice, nil); err != nil {
t.Fatalf("Node restart failed: %v", err)
}
// Now after a restart, we must re-track the payments. We set up a
// goroutine for each to track thir status updates.
var (
statusUpdates []chan *lnrpc.Payment
wg sync.WaitGroup
quit = make(chan struct{})
)
defer close(quit)
for _, preimg := range preimages {
hash := preimg.Hash()
ctx, cancel := context.WithCancel(ctxb)
defer cancel()
payStream, err := net.Alice.RouterClient.TrackPaymentV2(
ctx, &routerrpc.TrackPaymentRequest{
PaymentHash: hash[:],
},
)
if err != nil {
t.Fatalf("unable to send track payment: %v", err)
}
// We set up a channel where we'll forward any status update.
upd := make(chan *lnrpc.Payment)
wg.Add(1)
go func() {
defer wg.Done()
for {
payment, err := payStream.Recv()
if err != nil {
close(upd)
return
}
select {
case upd <- payment:
case <-quit:
return
}
}
}()
statusUpdates = append(statusUpdates, upd)
}
// Wait for the in-flight status update.
for _, upd := range statusUpdates {
select {
case payment, ok := <-upd:
if !ok {
t.Fatalf("failed getting payment update")
}
if payment.Status != lnrpc.Payment_IN_FLIGHT {
t.Fatalf("state not in in flight: %v",
payment.Status)
}
case <-time.After(5 * time.Second):
t.Fatalf("in flight status not recevied")
}
}
// Settle invoices half the invoices, cancel the rest.
for i, preimage := range preimages {
var expectedState lnrpc.Invoice_InvoiceState
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
if i%2 == 0 {
settle := &invoicesrpc.SettleInvoiceMsg{
Preimage: preimage[:],
}
_, err = carol.SettleInvoice(ctxt, settle)
expectedState = lnrpc.Invoice_SETTLED
} else {
hash := preimage.Hash()
settle := &invoicesrpc.CancelInvoiceMsg{
PaymentHash: hash[:],
}
_, err = carol.CancelInvoice(ctxt, settle)
expectedState = lnrpc.Invoice_CANCELED
}
if err != nil {
t.Fatalf("unable to cancel/settle invoice: %v", err)
}
stream := invoiceStreams[i]
invoice, err := stream.Recv()
require.NoError(t.t, err)
require.Equal(t.t, expectedState, invoice.State)
}
// Make sure we get the expected status update.
for i, upd := range statusUpdates {
// Read until the payment is in a terminal state.
var payment *lnrpc.Payment
for payment == nil {
select {
case p, ok := <-upd:
if !ok {
t.Fatalf("failed getting payment update")
}
if p.Status == lnrpc.Payment_IN_FLIGHT {
continue
}
payment = p
case <-time.After(5 * time.Second):
t.Fatalf("in flight status not recevied")
}
}
// Assert terminal payment state.
if i%2 == 0 {
if payment.Status != lnrpc.Payment_SUCCEEDED {
t.Fatalf("state not succeeded : %v",
payment.Status)
}
} else {
if payment.FailureReason !=
lnrpc.PaymentFailureReason_FAILURE_REASON_INCORRECT_PAYMENT_DETAILS {
t.Fatalf("state not failed: %v",
payment.FailureReason)
}
}
}
// Check that Alice's invoices to be shown as settled and failed
// accordingly, and preimages matching up.
req := &lnrpc.ListPaymentsRequest{
IncludeIncomplete: true,
}
ctxt, _ = context.WithTimeout(ctxt, defaultTimeout)
paymentsResp, err := net.Alice.ListPayments(ctxt, req)
if err != nil {
t.Fatalf("error when obtaining Alice payments: %v", err)
}
for i, preimage := range preimages {
paymentHash := preimage.Hash()
var p string
for _, resp := range paymentsResp.Payments {
if resp.PaymentHash == paymentHash.String() {
p = resp.PaymentPreimage
break
}
}
if p == "" {
t.Fatalf("payment not found")
}
if i%2 == 0 {
if p != preimage.String() {
t.Fatalf("preimage doesn't match: %v vs %v",
p, preimage.String())
}
} else {
if p != lntypes.ZeroHash.String() {
t.Fatalf("preimage not zero: %v", p)
}
}
}
// Check that all of our invoice streams are terminated by the server
// since the invoices have completed.
for _, stream := range invoiceStreams {
_, err = stream.Recv()
require.Equal(t.t, io.EOF, err)
}
}