mirror of
https://github.com/lightningnetwork/lnd.git
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612 lines
18 KiB
Go
612 lines
18 KiB
Go
package itest
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import (
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"context"
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"encoding/hex"
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"fmt"
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"sync"
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"time"
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"github.com/btcsuite/btcd/btcutil"
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"github.com/btcsuite/btcd/wire"
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"github.com/lightningnetwork/lnd/chainreg"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
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"github.com/lightningnetwork/lnd/lntest"
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"github.com/lightningnetwork/lnd/lntest/wait"
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"github.com/lightningnetwork/lnd/routing/route"
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"github.com/stretchr/testify/require"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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var (
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customTestKey uint64 = 394829
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customTestValue = []byte{1, 3, 5}
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)
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type interceptorTestCase struct {
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amountMsat int64
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payAddr []byte
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invoice *lnrpc.Invoice
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shouldHold bool
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interceptorAction routerrpc.ResolveHoldForwardAction
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}
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// testForwardInterceptorDedupHtlc tests that upon reconnection, duplicate
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// HTLCs aren't re-notified using the HTLC interceptor API.
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func testForwardInterceptorDedupHtlc(net *lntest.NetworkHarness, t *harnessTest) {
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// Initialize the test context with 3 connected nodes.
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alice := net.NewNode(t.t, "alice", nil)
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defer shutdownAndAssert(net, t, alice)
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bob := net.NewNode(t.t, "bob", nil)
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defer shutdownAndAssert(net, t, bob)
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carol := net.NewNode(t.t, "carol", nil)
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defer shutdownAndAssert(net, t, carol)
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tc := newInterceptorTestContext(t, net, alice, bob, carol)
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const (
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chanAmt = btcutil.Amount(300000)
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)
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// Open and wait for channels.
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tc.openChannel(tc.alice, tc.bob, chanAmt)
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tc.openChannel(tc.bob, tc.carol, chanAmt)
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defer tc.closeChannels()
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tc.waitForChannels()
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ctxb := context.Background()
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ctxt, cancelInterceptor := context.WithCancel(ctxb)
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interceptor, err := tc.bob.RouterClient.HtlcInterceptor(ctxt)
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require.NoError(tc.t.t, err, "failed to create HtlcInterceptor")
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addResponse, err := tc.carol.AddInvoice(ctxb, &lnrpc.Invoice{
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ValueMsat: 1000,
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})
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require.NoError(tc.t.t, err, "unable to add invoice")
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invoice, err := tc.carol.LookupInvoice(ctxb, &lnrpc.PaymentHash{
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RHashStr: hex.EncodeToString(addResponse.RHash),
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})
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require.NoError(tc.t.t, err, "unable to find invoice")
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// We start the htlc interceptor with a simple implementation that
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// saves all intercepted packets. These packets are held to simulate a
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// pending payment.
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interceptedPacketstMap := &sync.Map{}
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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for {
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packet, err := interceptor.Recv()
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if err != nil {
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// If it is just the error result of the
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// context cancellation the we exit silently.
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status, ok := status.FromError(err)
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if ok && status.Code() == codes.Canceled {
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return
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}
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// Otherwise it an unexpected error, we fail
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// the test.
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require.NoError(
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tc.t.t, err,
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"unexpected error in interceptor.Recv()",
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)
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return
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}
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interceptedPacketstMap.Store(
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packet.IncomingCircuitKey.HtlcId, packet,
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)
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}
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}()
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// We initiate a payment from Alice.
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wg.Add(1)
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go func() {
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defer wg.Done()
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_, _ = tc.sendAliceToCarolPayment(
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ctxb, 1000,
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invoice.RHash, invoice.PaymentAddr,
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)
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}()
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// Here we should wait for the channel to contain a pending htlc, and
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// also be shown as being active.
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err = wait.Predicate(func() bool {
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channels, err := tc.bob.ListChannels(ctxt, &lnrpc.ListChannelsRequest{
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ActiveOnly: true,
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Peer: tc.alice.PubKey[:],
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})
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if err != nil {
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return false
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}
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if len(channels.Channels) == 0 {
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return false
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}
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aliceChan := channels.Channels[0]
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if len(aliceChan.PendingHtlcs) == 0 {
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return false
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}
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return aliceChan.Active
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}, defaultTimeout)
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require.NoError(
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tc.t.t, err, "alice <> bob channel pending htlc never arrived",
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)
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// At this point we want to make bob's link send all pending htlcs to
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// the switch again. We force this behavior by disconnecting and
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// connecting to the peer.
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if err := tc.net.DisconnectNodes(tc.bob, tc.alice); err != nil {
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tc.t.Fatalf("failed to disconnect alice and bob")
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}
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tc.net.EnsureConnected(tc.t.t, tc.bob, tc.alice)
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// Here we wait for the channel to be active again.
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err = wait.Predicate(func() bool {
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req := &lnrpc.ListChannelsRequest{
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ActiveOnly: true,
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Peer: tc.alice.PubKey[:],
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}
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channels, err := tc.bob.ListChannels(ctxt, req)
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return err == nil && len(channels.Channels) > 0
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}, defaultTimeout)
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require.NoError(
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tc.t.t, err, "alice <> bob channel didn't re-activate",
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)
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// Now that the channel is active we make sure the test passes as
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// expected.
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payments, err := tc.alice.ListPayments(ctxb, &lnrpc.ListPaymentsRequest{
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IncludeIncomplete: true,
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})
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require.NoError(tc.t.t, err, "failed to fetch payment")
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// We expect one in flight payment since we held the htlcs.
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require.Equal(tc.t.t, len(payments.Payments), 1)
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require.Equal(tc.t.t, payments.Payments[0].Status, lnrpc.Payment_IN_FLIGHT)
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// We now fail all htlcs to cancel the payment.
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packetsCount := 0
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interceptedPacketstMap.Range(func(_, packet interface{}) bool {
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p := packet.(*routerrpc.ForwardHtlcInterceptRequest)
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_ = interceptor.Send(&routerrpc.ForwardHtlcInterceptResponse{
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IncomingCircuitKey: p.IncomingCircuitKey,
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Action: routerrpc.ResolveHoldForwardAction_FAIL,
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})
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packetsCount++
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return true
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})
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// At this point if we have more than one held htlcs then we should
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// fail. This means we hold the same htlc twice which is a risk we
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// want to eliminate. If we don't have the same htlc twice in theory we
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// can cancel one and settle the other by mistake.
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require.Equal(tc.t.t, packetsCount, 1)
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cancelInterceptor()
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wg.Wait()
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}
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// testForwardInterceptorBasic tests the forward interceptor RPC layer.
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// The test creates a cluster of 3 connected nodes: Alice -> Bob -> Carol
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// Alice sends 4 different payments to Carol while the interceptor handles
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// differently the htlcs.
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// The test ensures that:
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// 1. Intercepted failed htlcs result in no payment (invoice is not settled).
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// 2. Intercepted resumed htlcs result in a payment (invoice is settled).
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// 3. Intercepted held htlcs result in no payment (invoice is not settled).
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// 4. When Interceptor disconnects it resumes all held htlcs, which result in
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// valid payment (invoice is settled).
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func testForwardInterceptorBasic(net *lntest.NetworkHarness, t *harnessTest) {
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// Initialize the test context with 3 connected nodes.
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alice := net.NewNode(t.t, "alice", nil)
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defer shutdownAndAssert(net, t, alice)
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bob := net.NewNode(t.t, "bob", nil)
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defer shutdownAndAssert(net, t, bob)
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carol := net.NewNode(t.t, "carol", nil)
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defer shutdownAndAssert(net, t, carol)
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testContext := newInterceptorTestContext(t, net, alice, bob, carol)
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const (
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chanAmt = btcutil.Amount(300000)
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)
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// Open and wait for channels.
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testContext.openChannel(testContext.alice, testContext.bob, chanAmt)
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testContext.openChannel(testContext.bob, testContext.carol, chanAmt)
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defer testContext.closeChannels()
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testContext.waitForChannels()
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// Connect the interceptor.
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ctxb := context.Background()
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ctxt, cancelInterceptor := context.WithTimeout(ctxb, defaultTimeout)
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interceptor, err := testContext.bob.RouterClient.HtlcInterceptor(ctxt)
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require.NoError(t.t, err, "failed to create HtlcInterceptor")
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// Prepare the test cases.
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testCases := testContext.prepareTestCases()
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// A channel for the interceptor go routine to send the requested packets.
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interceptedChan := make(chan *routerrpc.ForwardHtlcInterceptRequest,
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len(testCases))
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// Run the interceptor loop in its own go routine.
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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for {
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request, err := interceptor.Recv()
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if err != nil {
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// If it is just the error result of the context cancellation
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// the we exit silently.
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status, ok := status.FromError(err)
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if ok && status.Code() == codes.Canceled {
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return
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}
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// Otherwise it an unexpected error, we fail the test.
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require.NoError(t.t, err, "unexpected error in interceptor.Recv()")
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return
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}
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interceptedChan <- request
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}
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}()
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// For each test case make sure we initiate a payment from Alice to Carol
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// routed through Bob. For each payment we also test its final status
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// according to the interceptorAction specified in the test case.
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wg.Add(1)
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go func() {
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defer wg.Done()
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for _, tc := range testCases {
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attempt, err := testContext.sendAliceToCarolPayment(
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context.Background(), tc.invoice.ValueMsat,
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tc.invoice.RHash, tc.payAddr,
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)
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if t.t.Failed() {
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return
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}
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if err != nil {
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require.NoError(t.t, err, "failed to send payment")
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}
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switch tc.interceptorAction {
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// For 'fail' interceptor action we make sure the payment failed.
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case routerrpc.ResolveHoldForwardAction_FAIL:
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require.Equal(t.t, lnrpc.HTLCAttempt_FAILED,
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attempt.Status, "expected payment to fail")
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// Assert that we get a temporary channel
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// failure which has a channel update.
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require.NotNil(t.t, attempt.Failure)
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require.NotNil(t.t, attempt.Failure.ChannelUpdate)
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require.Equal(t.t,
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lnrpc.Failure_TEMPORARY_CHANNEL_FAILURE,
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attempt.Failure.Code)
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// For settle and resume we make sure the payment is successful.
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case routerrpc.ResolveHoldForwardAction_SETTLE:
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fallthrough
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case routerrpc.ResolveHoldForwardAction_RESUME:
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require.Equal(t.t, lnrpc.HTLCAttempt_SUCCEEDED,
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attempt.Status, "expected payment to succeed")
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}
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}
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}()
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// We make sure here the interceptor has processed all packets before we
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// check the payment statuses.
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for i := 0; i < len(testCases); i++ {
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select {
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case request := <-interceptedChan:
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// Assert sanity of informational packet data.
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require.NotZero(t.t, request.OutgoingRequestedChanId)
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require.NotZero(t.t, request.IncomingExpiry)
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require.NotZero(t.t, request.IncomingAmountMsat)
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require.Less(
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t.t,
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request.OutgoingExpiry, request.IncomingExpiry,
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)
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require.Less(
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t.t,
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request.OutgoingAmountMsat,
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request.IncomingAmountMsat,
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)
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value, ok := request.CustomRecords[customTestKey]
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require.True(t.t, ok, "expected custom record")
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require.Equal(t.t, customTestValue, value)
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testCase := testCases[i]
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// For held packets we ignore, keeping them in hold status.
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if testCase.shouldHold {
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continue
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}
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// For all other packets we resolve according to the test case.
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_ = interceptor.Send(&routerrpc.ForwardHtlcInterceptResponse{
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IncomingCircuitKey: request.IncomingCircuitKey,
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Action: testCase.interceptorAction,
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Preimage: testCase.invoice.RPreimage,
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})
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case <-time.After(defaultTimeout):
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t.Fatalf("response from interceptor was not received %v", i)
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}
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}
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// At this point we are left with the held packets, we want to make sure
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// each one of them has a corresponding 'in-flight' payment at
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// Alice's node.
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payments, err := testContext.alice.ListPayments(context.Background(),
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&lnrpc.ListPaymentsRequest{IncludeIncomplete: true})
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require.NoError(t.t, err, "failed to fetch payment")
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for _, testCase := range testCases {
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if testCase.shouldHold {
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hashStr := hex.EncodeToString(testCase.invoice.RHash)
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var foundPayment *lnrpc.Payment
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expectedAmt := testCase.invoice.ValueMsat
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for _, p := range payments.Payments {
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if p.PaymentHash == hashStr {
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foundPayment = p
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break
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}
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}
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require.NotNil(t.t, foundPayment, fmt.Sprintf("expected "+
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"to find pending payment for held htlc %v",
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hashStr))
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require.Equal(t.t, lnrpc.Payment_IN_FLIGHT,
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foundPayment.Status, "expected payment to be "+
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"in flight")
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require.Equal(t.t, expectedAmt, foundPayment.ValueMsat,
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"incorrect in flight amount")
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}
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}
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// Disconnect interceptor should cause resume held packets.
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// After that we wait for all go routines to finish, including the one
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// that tests the payment final status for the held payment.
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cancelInterceptor()
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wg.Wait()
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// Verify that we don't get notified about already completed HTLCs
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// We do that by restarting alice, the sender the HTLCs. Under
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// https://github.com/lightningnetwork/lnd/issues/5115
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// this should cause all HTLCs settled or failed by the interceptor to renotify.
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restartAlice, err := net.SuspendNode(alice)
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require.NoError(t.t, err, "failed to suspend alice")
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ctxt, cancelInterceptor = context.WithTimeout(ctxb, defaultTimeout)
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defer cancelInterceptor()
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interceptor, err = testContext.bob.RouterClient.HtlcInterceptor(ctxt)
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require.NoError(t.t, err, "failed to create HtlcInterceptor")
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err = restartAlice()
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require.NoError(t.t, err, "failed to restart alice")
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go func() {
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request, err := interceptor.Recv()
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if err != nil {
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// If it is just the error result of the context cancellation
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// the we exit silently.
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status, ok := status.FromError(err)
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if ok && status.Code() == codes.Canceled {
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return
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}
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// Otherwise it an unexpected error, we fail the test.
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require.NoError(
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t.t, err, "unexpected error in interceptor.Recv()",
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)
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return
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}
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require.Nil(t.t, request, "no more intercepts should arrive")
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}()
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err = wait.Predicate(func() bool {
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channels, err := bob.ListChannels(ctxt, &lnrpc.ListChannelsRequest{
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ActiveOnly: true, Peer: alice.PubKey[:],
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})
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return err == nil && len(channels.Channels) > 0
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}, defaultTimeout)
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require.NoError(t.t, err, "alice <> bob channel didn't re-activate")
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}
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// interceptorTestContext is a helper struct to hold the test context and
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// provide the needed functionality.
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type interceptorTestContext struct {
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t *harnessTest
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net *lntest.NetworkHarness
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// Keep a list of all our active channels.
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networkChans []*lnrpc.ChannelPoint
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closeChannelFuncs []func()
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alice, bob, carol *lntest.HarnessNode
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nodes []*lntest.HarnessNode
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}
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func newInterceptorTestContext(t *harnessTest,
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net *lntest.NetworkHarness,
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alice, bob, carol *lntest.HarnessNode) *interceptorTestContext {
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// Connect nodes
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nodes := []*lntest.HarnessNode{alice, bob, carol}
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for i := 0; i < len(nodes); i++ {
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for j := i + 1; j < len(nodes); j++ {
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net.EnsureConnected(t.t, nodes[i], nodes[j])
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}
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}
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ctx := interceptorTestContext{
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t: t,
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net: net,
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alice: alice,
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bob: bob,
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carol: carol,
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nodes: nodes,
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}
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return &ctx
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}
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// prepareTestCases prepares 4 tests:
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// 1. failed htlc.
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// 2. resumed htlc.
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// 3. settling htlc externally.
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// 4. held htlc that is resumed later.
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func (c *interceptorTestContext) prepareTestCases() []*interceptorTestCase {
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cases := []*interceptorTestCase{
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{amountMsat: 1000, shouldHold: false,
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interceptorAction: routerrpc.ResolveHoldForwardAction_FAIL},
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{amountMsat: 1000, shouldHold: false,
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interceptorAction: routerrpc.ResolveHoldForwardAction_RESUME},
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{amountMsat: 1000, shouldHold: false,
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interceptorAction: routerrpc.ResolveHoldForwardAction_SETTLE},
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{amountMsat: 1000, shouldHold: true,
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interceptorAction: routerrpc.ResolveHoldForwardAction_RESUME},
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}
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for _, t := range cases {
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addResponse, err := c.carol.AddInvoice(context.Background(), &lnrpc.Invoice{
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ValueMsat: t.amountMsat,
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})
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require.NoError(c.t.t, err, "unable to add invoice")
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invoice, err := c.carol.LookupInvoice(context.Background(), &lnrpc.PaymentHash{
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RHashStr: hex.EncodeToString(addResponse.RHash),
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})
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require.NoError(c.t.t, err, "unable to find invoice")
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// We'll need to also decode the returned invoice so we can
|
|
// grab the payment address which is now required for ALL
|
|
// payments.
|
|
payReq, err := c.carol.DecodePayReq(context.Background(), &lnrpc.PayReqString{
|
|
PayReq: invoice.PaymentRequest,
|
|
})
|
|
require.NoError(c.t.t, err, "unable to decode invoice")
|
|
|
|
t.invoice = invoice
|
|
t.payAddr = payReq.PaymentAddr
|
|
}
|
|
return cases
|
|
}
|
|
|
|
func (c *interceptorTestContext) openChannel(from, to *lntest.HarnessNode,
|
|
chanSize btcutil.Amount) {
|
|
|
|
c.net.SendCoins(c.t.t, btcutil.SatoshiPerBitcoin, from)
|
|
|
|
chanPoint := openChannelAndAssert(
|
|
c.t, c.net, from, to,
|
|
lntest.OpenChannelParams{
|
|
Amt: chanSize,
|
|
},
|
|
)
|
|
|
|
c.closeChannelFuncs = append(c.closeChannelFuncs, func() {
|
|
closeChannelAndAssert(c.t, c.net, from, chanPoint, false)
|
|
})
|
|
|
|
c.networkChans = append(c.networkChans, chanPoint)
|
|
}
|
|
|
|
func (c *interceptorTestContext) closeChannels() {
|
|
for _, f := range c.closeChannelFuncs {
|
|
f()
|
|
}
|
|
}
|
|
|
|
func (c *interceptorTestContext) waitForChannels() {
|
|
// Wait for all nodes to have seen all channels.
|
|
for _, chanPoint := range c.networkChans {
|
|
for _, node := range c.nodes {
|
|
txid, err := lnrpc.GetChanPointFundingTxid(chanPoint)
|
|
require.NoError(c.t.t, err, "unable to get txid")
|
|
|
|
point := wire.OutPoint{
|
|
Hash: *txid,
|
|
Index: chanPoint.OutputIndex,
|
|
}
|
|
|
|
err = node.WaitForNetworkChannelOpen(chanPoint)
|
|
require.NoError(c.t.t, err, fmt.Sprintf("(%d): timeout "+
|
|
"waiting for channel(%s) open", node.NodeID,
|
|
point))
|
|
}
|
|
}
|
|
}
|
|
|
|
// sendAliceToCarolPayment sends a payment from alice to carol and make an
|
|
// attempt to pay. The lnrpc.HTLCAttempt is returned.
|
|
func (c *interceptorTestContext) sendAliceToCarolPayment(ctx context.Context,
|
|
amtMsat int64,
|
|
paymentHash, paymentAddr []byte) (*lnrpc.HTLCAttempt, error) {
|
|
|
|
// Build a route from alice to carol.
|
|
route, err := c.buildRoute(
|
|
ctx, amtMsat, []*lntest.HarnessNode{c.bob, c.carol},
|
|
paymentAddr,
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
sendReq := &routerrpc.SendToRouteRequest{
|
|
PaymentHash: paymentHash,
|
|
Route: route,
|
|
}
|
|
|
|
// Send a custom record to the forwarding node.
|
|
route.Hops[0].CustomRecords = map[uint64][]byte{
|
|
customTestKey: customTestValue,
|
|
}
|
|
|
|
// Send the payment.
|
|
return c.alice.RouterClient.SendToRouteV2(ctx, sendReq)
|
|
}
|
|
|
|
// buildRoute is a helper function to build a route with given hops.
|
|
func (c *interceptorTestContext) buildRoute(ctx context.Context, amtMsat int64,
|
|
hops []*lntest.HarnessNode, payAddr []byte) (*lnrpc.Route, error) {
|
|
|
|
rpcHops := make([][]byte, 0, len(hops))
|
|
for _, hop := range hops {
|
|
k := hop.PubKeyStr
|
|
pubkey, err := route.NewVertexFromStr(k)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error parsing %v: %v",
|
|
k, err)
|
|
}
|
|
rpcHops = append(rpcHops, pubkey[:])
|
|
}
|
|
|
|
req := &routerrpc.BuildRouteRequest{
|
|
AmtMsat: amtMsat,
|
|
FinalCltvDelta: chainreg.DefaultBitcoinTimeLockDelta,
|
|
HopPubkeys: rpcHops,
|
|
PaymentAddr: payAddr,
|
|
}
|
|
|
|
routeResp, err := c.alice.RouterClient.BuildRoute(ctx, req)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return routeResp.Route, nil
|
|
}
|