diff --git a/channeldb/invoices.go b/channeldb/invoices.go index 24d80b3e..9e3e7326 100644 --- a/channeldb/invoices.go +++ b/channeldb/invoices.go @@ -362,6 +362,11 @@ func (c ContractState) String() string { return "Unknown" } +// IsFinal returns a boolean indicating whether an invoice state is final +func (c ContractState) IsFinal() bool { + return c == ContractSettled || c == ContractCanceled +} + // ContractTerm is a companion struct to the Invoice struct. This struct houses // the necessary conditions required before the invoice can be considered fully // settled by the payee. diff --git a/lnrpc/invoicesrpc/invoices_server.go b/lnrpc/invoicesrpc/invoices_server.go index 9c092e57..2fa881db 100644 --- a/lnrpc/invoicesrpc/invoices_server.go +++ b/lnrpc/invoicesrpc/invoices_server.go @@ -247,6 +247,12 @@ func (s *Server) SubscribeSingleInvoice(req *SubscribeSingleInvoiceRequest, return err } + // If we have reached a terminal state, close the + // stream with no error. + if newInvoice.State.IsFinal() { + return nil + } + case <-s.quit: return nil } diff --git a/lntest/itest/lnd_hold_persistence_test.go b/lntest/itest/lnd_hold_persistence_test.go new file mode 100644 index 00000000..06c4daaf --- /dev/null +++ b/lntest/itest/lnd_hold_persistence_test.go @@ -0,0 +1,414 @@ +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, err := net.NewNode("Carol", nil) + if err != nil { + t.Fatalf("unable to create new nodes: %v", err) + } + 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) + } +} diff --git a/lntest/itest/lnd_test.go b/lntest/itest/lnd_test.go index 687827e3..666b6641 100644 --- a/lntest/itest/lnd_test.go +++ b/lntest/itest/lnd_test.go @@ -14,7 +14,6 @@ import ( "os" "reflect" "strings" - "sync" "sync/atomic" "testing" "time" @@ -37,7 +36,6 @@ import ( "github.com/lightningnetwork/lnd/labels" "github.com/lightningnetwork/lnd/lncfg" "github.com/lightningnetwork/lnd/lnrpc" - "github.com/lightningnetwork/lnd/lnrpc/invoicesrpc" "github.com/lightningnetwork/lnd/lnrpc/routerrpc" "github.com/lightningnetwork/lnd/lnrpc/signrpc" "github.com/lightningnetwork/lnd/lnrpc/walletrpc" @@ -45,7 +43,6 @@ import ( "github.com/lightningnetwork/lnd/lnrpc/wtclientrpc" "github.com/lightningnetwork/lnd/lntest" "github.com/lightningnetwork/lnd/lntest/wait" - "github.com/lightningnetwork/lnd/lntypes" "github.com/lightningnetwork/lnd/lnwallet" "github.com/lightningnetwork/lnd/lnwallet/chainfee" "github.com/lightningnetwork/lnd/lnwire" @@ -13773,383 +13770,6 @@ func assertTxLabel(ctx context.Context, t *harnessTest, } } -// 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, err := net.NewNode("Carol", nil) - if err != nil { - t.Fatalf("unable to create new nodes: %v", err) - } - 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 { - ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) - if i%2 == 0 { - settle := &invoicesrpc.SettleInvoiceMsg{ - Preimage: preimage[:], - } - _, err = carol.SettleInvoice(ctxt, settle) - } else { - hash := preimage.Hash() - settle := &invoicesrpc.CancelInvoiceMsg{ - PaymentHash: hash[:], - } - _, err = carol.CancelInvoice(ctxt, settle) - } - if err != nil { - t.Fatalf("unable to cancel/settle invoice: %v", err) - } - } - - // 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) - } - } - } -} - // deriveFundingShim creates a channel funding shim by deriving the necessary // keys on both sides. func deriveFundingShim(net *lntest.NetworkHarness, t *harnessTest,