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895a2e497b
lnd/htlcswitch/switch_test.go
Oliver Gugger 895a2e497b
multi: formatting and comment fixes
2022-02-10 11:02:02 +01:00

3734 lines
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package htlcswitch
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"fmt"
"io"
"io/ioutil"
"reflect"
"testing"
"time"
"github.com/btcsuite/btcutil"
"github.com/davecgh/go-spew/spew"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/htlcswitch/hodl"
"github.com/lightningnetwork/lnd/htlcswitch/hop"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/ticker"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var zeroCircuit = channeldb.CircuitKey{}
func genPreimage() ([32]byte, error) {
var preimage [32]byte
if _, err := io.ReadFull(rand.Reader, preimage[:]); err != nil {
return preimage, err
}
return preimage, nil
}
// TestSwitchAddDuplicateLink tests that the switch will reject duplicate links
// for both pending and live links. It also tests that we can successfully
// add a link after having removed it.
func TestSwitchAddDuplicateLink(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, _, aliceChanID, _ := genIDs()
pendingChanID := lnwire.ShortChannelID{}
aliceChannelLink := newMockChannelLink(
s, chanID1, pendingChanID, alicePeer, false,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
// Alice should have a pending link, adding again should fail.
if err := s.AddLink(aliceChannelLink); err == nil {
t.Fatalf("adding duplicate link should have failed")
}
// Update the short chan id of the channel, so that the link goes live.
aliceChannelLink.setLiveShortChanID(aliceChanID)
err = s.UpdateShortChanID(chanID1)
if err != nil {
t.Fatalf("unable to update alice short_chan_id: %v", err)
}
// Alice should have a live link, adding again should fail.
if err := s.AddLink(aliceChannelLink); err == nil {
t.Fatalf("adding duplicate link should have failed")
}
// Remove the live link to ensure the indexes are cleared.
s.RemoveLink(chanID1)
// Alice has no links, adding should succeed.
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
}
// TestSwitchHasActiveLink tests the behavior of HasActiveLink, and asserts that
// it only returns true if a link's short channel id has confirmed (meaning the
// channel is no longer pending) and it's EligibleToForward method returns true,
// i.e. it has received FundingLocked from the remote peer.
func TestSwitchHasActiveLink(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, _, aliceChanID, _ := genIDs()
pendingChanID := lnwire.ShortChannelID{}
aliceChannelLink := newMockChannelLink(
s, chanID1, pendingChanID, alicePeer, false,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
// The link has been added, but it's still pending. HasActiveLink should
// return false since the link has not been added to the linkIndex
// containing live links.
if s.HasActiveLink(chanID1) {
t.Fatalf("link should not be active yet, still pending")
}
// Update the short chan id of the channel, so that the link goes live.
aliceChannelLink.setLiveShortChanID(aliceChanID)
err = s.UpdateShortChanID(chanID1)
if err != nil {
t.Fatalf("unable to update alice short_chan_id: %v", err)
}
// UpdateShortChanID will cause the mock link to become eligible to
// forward. However, we can simulate the event where the short chan id
// is confirmed, but funding locked has yet to be received by resetting
// the mock link's eligibility to false.
aliceChannelLink.eligible = false
// Now, even though the link has been added to the linkIndex because the
// short channel id has confirmed, we should still see HasActiveLink
// fail because EligibleToForward should return false.
if s.HasActiveLink(chanID1) {
t.Fatalf("link should not be active yet, still ineligible")
}
// Finally, simulate the link receiving funding locked by setting its
// eligibility to true.
aliceChannelLink.eligible = true
// The link should now be reported as active, since EligibleToForward
// returns true and the link is in the linkIndex.
if !s.HasActiveLink(chanID1) {
t.Fatalf("link should not be active now")
}
}
// TestSwitchSendPending checks the inability of htlc switch to forward adds
// over pending links, and the UpdateShortChanID makes a pending link live.
func TestSwitchSendPending(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
pendingChanID := lnwire.ShortChannelID{}
aliceChannelLink := newMockChannelLink(
s, chanID1, pendingChanID, alicePeer, false,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should is being forwarded from Bob channel
// link to Alice channel link.
preimage, err := genPreimage()
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
rhash := sha256.Sum256(preimage[:])
packet := &htlcPacket{
incomingChanID: bobChanID,
incomingHTLCID: 0,
outgoingChanID: aliceChanID,
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
// Send the ADD packet, this should not be forwarded out to the link
// since there are no eligible links.
if err = s.ForwardPackets(nil, packet); err != nil {
t.Fatal(err)
}
select {
case p := <-bobChannelLink.packets:
if p.linkFailure != nil {
err = p.linkFailure
}
case <-time.After(time.Second):
t.Fatal("no timely reply from switch")
}
linkErr, ok := err.(*LinkError)
if !ok {
t.Fatalf("expected link error, got: %T", err)
}
if linkErr.WireMessage().Code() != lnwire.CodeUnknownNextPeer {
t.Fatalf("expected fail unknown next peer, got: %T",
linkErr.WireMessage().Code())
}
// No message should be sent, since the packet was failed.
select {
case <-aliceChannelLink.packets:
t.Fatal("expected not to receive message")
case <-time.After(time.Second):
}
// Since the packet should have been failed, there should be no active
// circuits.
if s.circuits.NumOpen() != 0 {
t.Fatal("wrong amount of circuits")
}
// Now, update Alice's link with her final short channel id. This should
// move the link to the live state.
aliceChannelLink.setLiveShortChanID(aliceChanID)
err = s.UpdateShortChanID(chanID1)
if err != nil {
t.Fatalf("unable to update alice short_chan_id: %v", err)
}
// Increment the packet's HTLC index, so that it does not collide with
// the prior attempt.
packet.incomingHTLCID++
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, packet); err != nil {
t.Fatalf("unexpected forward failure: %v", err)
}
// Since Alice's link is now active, this packet should succeed.
select {
case <-aliceChannelLink.packets:
case <-time.After(time.Second):
t.Fatal("request was not propagated to alice")
}
}
// TestSwitchForward checks the ability of htlc switch to forward add/settle
// requests.
func TestSwitchForward(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarded from Alice channel link to
// bob channel link.
preimage, err := genPreimage()
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
rhash := sha256.Sum256(preimage[:])
packet := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, packet); err != nil {
t.Fatal(err)
}
select {
case <-bobChannelLink.packets:
if err := bobChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.NumOpen() != 1 {
t.Fatal("wrong amount of circuits")
}
if !s.IsForwardedHTLC(bobChannelLink.ShortChanID(), 0) {
t.Fatal("htlc should be identified as forwarded")
}
// Create settle request pretending that bob link handled the add htlc
// request and sent the htlc settle request back. This request should
// be forwarder back to Alice link.
packet = &htlcPacket{
outgoingChanID: bobChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFulfillHTLC{
PaymentPreimage: preimage,
},
}
// Handle the request and checks that payment circuit works properly.
if err := s.ForwardPackets(nil, packet); err != nil {
t.Fatal(err)
}
select {
case pkt := <-aliceChannelLink.packets:
if err := aliceChannelLink.deleteCircuit(pkt); err != nil {
t.Fatalf("unable to remove circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s.circuits.NumOpen() != 0 {
t.Fatal("wrong amount of circuits")
}
}
func TestSwitchForwardFailAfterFullAdd(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
tempPath, err := ioutil.TempDir("", "circuitdb")
if err != nil {
t.Fatalf("unable to temporary path: %v", err)
}
cdb, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to open channeldb: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, cdb)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
// Even though we intend to Stop s later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s.Stop()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarded from Alice channel link to
// bob channel link.
preimage := [sha256.Size]byte{1}
rhash := sha256.Sum256(preimage[:])
ogPacket := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
if s.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, ogPacket); err != nil {
t.Fatal(err)
}
if s.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Pull packet from bob's link, but do not perform a full add.
select {
case packet := <-bobChannelLink.packets:
// Complete the payment circuit and assign the outgoing htlc id
// before restarting.
if err := bobChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 1 {
t.Fatalf("wrong amount of circuits")
}
// Now we will restart bob, leaving the forwarding decision for this
// htlc is in the half-added state.
if err := s.Stop(); err != nil {
t.Fatalf(err.Error())
}
if err := cdb.Close(); err != nil {
t.Fatalf(err.Error())
}
cdb2, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to reopen channeldb: %v", err)
}
s2, err := initSwitchWithDB(testStartingHeight, cdb2)
if err != nil {
t.Fatalf("unable reinit switch: %v", err)
}
if err := s2.Start(); err != nil {
t.Fatalf("unable to restart switch: %v", err)
}
// Even though we intend to Stop s2 later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s2.Stop()
aliceChannelLink = newMockChannelLink(
s2, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink = newMockChannelLink(
s2, chanID2, bobChanID, bobPeer, true,
)
if err := s2.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s2.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
if s2.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s2.circuits.NumOpen() != 1 {
t.Fatalf("wrong amount of circuits")
}
// Craft a failure message from the remote peer.
fail := &htlcPacket{
outgoingChanID: bobChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFailHTLC{},
}
// Send the fail packet from the remote peer through the switch.
if err := s2.ForwardPackets(nil, fail); err != nil {
t.Fatalf(err.Error())
}
// Pull packet from alice's link, as it should have gone through
// successfully.
select {
case pkt := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(pkt); err != nil {
t.Fatalf("unable to remove circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
// Circuit map should be empty now.
if s2.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits")
}
if s2.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Send the fail packet from the remote peer through the switch.
if err := s.ForwardPackets(nil, fail); err != nil {
t.Fatal(err)
}
select {
case <-aliceChannelLink.packets:
t.Fatalf("expected duplicate fail to not arrive at the destination")
case <-time.After(time.Second):
}
}
func TestSwitchForwardSettleAfterFullAdd(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
tempPath, err := ioutil.TempDir("", "circuitdb")
if err != nil {
t.Fatalf("unable to temporary path: %v", err)
}
cdb, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to open channeldb: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, cdb)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
// Even though we intend to Stop s later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s.Stop()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarded from Alice channel link to
// bob channel link.
preimage := [sha256.Size]byte{1}
rhash := sha256.Sum256(preimage[:])
ogPacket := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
if s.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, ogPacket); err != nil {
t.Fatal(err)
}
if s.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Pull packet from bob's link, but do not perform a full add.
select {
case packet := <-bobChannelLink.packets:
// Complete the payment circuit and assign the outgoing htlc id
// before restarting.
if err := bobChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 1 {
t.Fatalf("wrong amount of circuits")
}
// Now we will restart bob, leaving the forwarding decision for this
// htlc is in the half-added state.
if err := s.Stop(); err != nil {
t.Fatalf(err.Error())
}
if err := cdb.Close(); err != nil {
t.Fatalf(err.Error())
}
cdb2, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to reopen channeldb: %v", err)
}
s2, err := initSwitchWithDB(testStartingHeight, cdb2)
if err != nil {
t.Fatalf("unable reinit switch: %v", err)
}
if err := s2.Start(); err != nil {
t.Fatalf("unable to restart switch: %v", err)
}
// Even though we intend to Stop s2 later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s2.Stop()
aliceChannelLink = newMockChannelLink(
s2, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink = newMockChannelLink(
s2, chanID2, bobChanID, bobPeer, true,
)
if err := s2.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s2.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
if s2.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s2.circuits.NumOpen() != 1 {
t.Fatalf("wrong amount of circuits")
}
// Craft a settle message from the remote peer.
settle := &htlcPacket{
outgoingChanID: bobChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFulfillHTLC{
PaymentPreimage: preimage,
},
}
// Send the settle packet from the remote peer through the switch.
if err := s2.ForwardPackets(nil, settle); err != nil {
t.Fatalf(err.Error())
}
// Pull packet from alice's link, as it should have gone through
// successfully.
select {
case packet := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete circuit with in key=%s: %v",
packet.inKey(), err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
// Circuit map should be empty now.
if s2.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits")
}
if s2.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Send the settle packet again, which not arrive at destination.
if err := s2.ForwardPackets(nil, settle); err != nil {
t.Fatal(err)
}
select {
case <-bobChannelLink.packets:
t.Fatalf("expected duplicate fail to not arrive at the destination")
case <-time.After(time.Second):
}
}
func TestSwitchForwardDropAfterFullAdd(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
tempPath, err := ioutil.TempDir("", "circuitdb")
if err != nil {
t.Fatalf("unable to temporary path: %v", err)
}
cdb, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to open channeldb: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, cdb)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
// Even though we intend to Stop s later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s.Stop()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarded from Alice channel link to
// bob channel link.
preimage := [sha256.Size]byte{1}
rhash := sha256.Sum256(preimage[:])
ogPacket := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
if s.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, ogPacket); err != nil {
t.Fatal(err)
}
if s.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of half circuits")
}
// Pull packet from bob's link, but do not perform a full add.
select {
case packet := <-bobChannelLink.packets:
// Complete the payment circuit and assign the outgoing htlc id
// before restarting.
if err := bobChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
// Now we will restart bob, leaving the forwarding decision for this
// htlc is in the half-added state.
if err := s.Stop(); err != nil {
t.Fatalf(err.Error())
}
if err := cdb.Close(); err != nil {
t.Fatalf(err.Error())
}
cdb2, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to reopen channeldb: %v", err)
}
s2, err := initSwitchWithDB(testStartingHeight, cdb2)
if err != nil {
t.Fatalf("unable reinit switch: %v", err)
}
if err := s2.Start(); err != nil {
t.Fatalf("unable to restart switch: %v", err)
}
// Even though we intend to Stop s2 later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s2.Stop()
aliceChannelLink = newMockChannelLink(
s2, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink = newMockChannelLink(
s2, chanID2, bobChanID, bobPeer, true,
)
if err := s2.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s2.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
if s2.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s2.circuits.NumOpen() != 1 {
t.Fatalf("wrong amount of half circuits")
}
// Resend the failed htlc. The packet will be dropped silently since the
// switch will detect that it has been half added previously.
if err := s2.ForwardPackets(nil, ogPacket); err != nil {
t.Fatal(err)
}
// After detecting an incomplete forward, the fail packet should have
// been returned to the sender.
select {
case <-aliceChannelLink.packets:
t.Fatal("request should not have returned to source")
case <-bobChannelLink.packets:
t.Fatal("request should not have forwarded to destination")
case <-time.After(time.Second):
}
}
func TestSwitchForwardFailAfterHalfAdd(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
tempPath, err := ioutil.TempDir("", "circuitdb")
if err != nil {
t.Fatalf("unable to temporary path: %v", err)
}
cdb, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to open channeldb: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, cdb)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
// Even though we intend to Stop s later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s.Stop()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarded from Alice channel link to
// bob channel link.
preimage := [sha256.Size]byte{1}
rhash := sha256.Sum256(preimage[:])
ogPacket := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
if s.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, ogPacket); err != nil {
t.Fatal(err)
}
if s.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of half circuits")
}
// Pull packet from bob's link, but do not perform a full add.
select {
case <-bobChannelLink.packets:
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
// Now we will restart bob, leaving the forwarding decision for this
// htlc is in the half-added state.
if err := s.Stop(); err != nil {
t.Fatalf(err.Error())
}
if err := cdb.Close(); err != nil {
t.Fatalf(err.Error())
}
cdb2, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to reopen channeldb: %v", err)
}
s2, err := initSwitchWithDB(testStartingHeight, cdb2)
if err != nil {
t.Fatalf("unable reinit switch: %v", err)
}
if err := s2.Start(); err != nil {
t.Fatalf("unable to restart switch: %v", err)
}
// Even though we intend to Stop s2 later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s2.Stop()
aliceChannelLink = newMockChannelLink(
s2, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink = newMockChannelLink(
s2, chanID2, bobChanID, bobPeer, true,
)
if err := s2.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s2.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
if s2.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s2.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of half circuits")
}
// Resend the failed htlc, it should be returned to alice since the
// switch will detect that it has been half added previously.
err = s2.ForwardPackets(nil, ogPacket)
if err != nil {
t.Fatal(err)
}
// After detecting an incomplete forward, the fail packet should have
// been returned to the sender.
select {
case pkt := <-aliceChannelLink.packets:
linkErr := pkt.linkFailure
if linkErr.FailureDetail != OutgoingFailureIncompleteForward {
t.Fatalf("expected incomplete forward, got: %v",
linkErr.FailureDetail)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
}
// TestSwitchForwardCircuitPersistence checks the ability of htlc switch to
// maintain the proper entries in the circuit map in the face of restarts.
func TestSwitchForwardCircuitPersistence(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
tempPath, err := ioutil.TempDir("", "circuitdb")
if err != nil {
t.Fatalf("unable to temporary path: %v", err)
}
cdb, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to open channeldb: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, cdb)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
// Even though we intend to Stop s later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s.Stop()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarded from Alice channel link to
// bob channel link.
preimage := [sha256.Size]byte{1}
rhash := sha256.Sum256(preimage[:])
ogPacket := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
if s.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, ogPacket); err != nil {
t.Fatal(err)
}
if s.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
// Retrieve packet from outgoing link and cache until after restart.
var packet *htlcPacket
select {
case packet = <-bobChannelLink.packets:
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if err := s.Stop(); err != nil {
t.Fatalf(err.Error())
}
if err := cdb.Close(); err != nil {
t.Fatalf(err.Error())
}
cdb2, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to reopen channeldb: %v", err)
}
s2, err := initSwitchWithDB(testStartingHeight, cdb2)
if err != nil {
t.Fatalf("unable reinit switch: %v", err)
}
if err := s2.Start(); err != nil {
t.Fatalf("unable to restart switch: %v", err)
}
// Even though we intend to Stop s2 later in the test, it is safe to
// defer this Stop since its execution it is protected by an atomic
// guard, guaranteeing it executes at most once.
defer s2.Stop()
aliceChannelLink = newMockChannelLink(
s2, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink = newMockChannelLink(
s2, chanID2, bobChanID, bobPeer, true,
)
if err := s2.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s2.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
if s2.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s2.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of half circuits")
}
// Now that the switch has restarted, complete the payment circuit.
if err := bobChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
if s2.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s2.circuits.NumOpen() != 1 {
t.Fatal("wrong amount of circuits")
}
// Create settle request pretending that bob link handled the add htlc
// request and sent the htlc settle request back. This request should
// be forwarder back to Alice link.
ogPacket = &htlcPacket{
outgoingChanID: bobChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFulfillHTLC{
PaymentPreimage: preimage,
},
}
// Handle the request and checks that payment circuit works properly.
if err := s2.ForwardPackets(nil, ogPacket); err != nil {
t.Fatal(err)
}
select {
case packet = <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete circuit with in key=%s: %v",
packet.inKey(), err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s2.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits, want 1, got %d",
s2.circuits.NumPending())
}
if s2.circuits.NumOpen() != 0 {
t.Fatal("wrong amount of circuits")
}
if err := s2.Stop(); err != nil {
t.Fatal(err)
}
if err := cdb2.Close(); err != nil {
t.Fatalf(err.Error())
}
cdb3, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to reopen channeldb: %v", err)
}
s3, err := initSwitchWithDB(testStartingHeight, cdb3)
if err != nil {
t.Fatalf("unable reinit switch: %v", err)
}
if err := s3.Start(); err != nil {
t.Fatalf("unable to restart switch: %v", err)
}
defer s3.Stop()
aliceChannelLink = newMockChannelLink(
s3, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink = newMockChannelLink(
s3, chanID2, bobChanID, bobPeer, true,
)
if err := s3.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s3.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
if s3.circuits.NumPending() != 0 {
t.Fatalf("wrong amount of half circuits")
}
if s3.circuits.NumOpen() != 0 {
t.Fatalf("wrong amount of circuits")
}
}
type multiHopFwdTest struct {
name string
eligible1, eligible2 bool
failure1, failure2 *LinkError
expectedReply lnwire.FailCode
}
// TestCircularForwards tests the allowing/disallowing of circular payments
// through the same channel in the case where the switch is configured to allow
// and disallow same channel circular forwards.
func TestCircularForwards(t *testing.T) {
chanID1, aliceChanID := genID()
preimage := [sha256.Size]byte{1}
hash := sha256.Sum256(preimage[:])
tests := []struct {
name string
allowCircularPayment bool
expectedErr error
}{
{
name: "circular payment allowed",
allowCircularPayment: true,
expectedErr: nil,
},
{
name: "circular payment disallowed",
allowCircularPayment: false,
expectedErr: NewDetailedLinkError(
lnwire.NewTemporaryChannelFailure(nil),
OutgoingFailureCircularRoute,
),
},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil,
testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v",
err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer func() { _ = s.Stop() }()
// Set the switch to allow or disallow circular routes
// according to the test's requirements.
s.cfg.AllowCircularRoute = test.allowCircularPayment
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
// Create a new packet that loops through alice's link
// in a circle.
obfuscator := NewMockObfuscator()
packet := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
outgoingChanID: aliceChannelLink.ShortChanID(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: hash,
Amount: 1,
},
obfuscator: obfuscator,
}
// Attempt to forward the packet and check for the expected
// error.
if err = s.ForwardPackets(nil, packet); err != nil {
t.Fatal(err)
}
select {
case p := <-aliceChannelLink.packets:
if p.linkFailure != nil {
err = p.linkFailure
}
case <-time.After(time.Second):
t.Fatal("no timely reply from switch")
}
if !reflect.DeepEqual(err, test.expectedErr) {
t.Fatalf("expected: %v, got: %v",
test.expectedErr, err)
}
// Ensure that no circuits were opened.
if s.circuits.NumOpen() > 0 {
t.Fatal("do not expect any open circuits")
}
})
}
}
// TestCheckCircularForward tests the error returned by checkCircularForward
// in cases where we allow and disallow same channel circular forwards.
func TestCheckCircularForward(t *testing.T) {
tests := []struct {
name string
// allowCircular determines whether we should allow circular
// forwards.
allowCircular bool
// incomingLink is the link that the htlc arrived on.
incomingLink lnwire.ShortChannelID
// outgoingLink is the link that the htlc forward
// is destined to leave on.
outgoingLink lnwire.ShortChannelID
// expectedErr is the error we expect to be returned.
expectedErr *LinkError
}{
{
name: "not circular, allowed in config",
allowCircular: true,
incomingLink: lnwire.NewShortChanIDFromInt(123),
outgoingLink: lnwire.NewShortChanIDFromInt(321),
expectedErr: nil,
},
{
name: "not circular, not allowed in config",
allowCircular: false,
incomingLink: lnwire.NewShortChanIDFromInt(123),
outgoingLink: lnwire.NewShortChanIDFromInt(321),
expectedErr: nil,
},
{
name: "circular, allowed in config",
allowCircular: true,
incomingLink: lnwire.NewShortChanIDFromInt(123),
outgoingLink: lnwire.NewShortChanIDFromInt(123),
expectedErr: nil,
},
{
name: "circular, not allowed in config",
allowCircular: false,
incomingLink: lnwire.NewShortChanIDFromInt(123),
outgoingLink: lnwire.NewShortChanIDFromInt(123),
expectedErr: NewDetailedLinkError(
lnwire.NewTemporaryChannelFailure(nil),
OutgoingFailureCircularRoute,
),
},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
t.Parallel()
// Check for a circular forward, the hash passed can
// be nil because it is only used for logging.
err := checkCircularForward(
test.incomingLink, test.outgoingLink,
test.allowCircular, lntypes.Hash{},
)
if !reflect.DeepEqual(err, test.expectedErr) {
t.Fatalf("expected: %v, got: %v",
test.expectedErr, err)
}
})
}
}
// TestSkipIneligibleLinksMultiHopForward tests that if a multi-hop HTLC comes
// along, then we won't attempt to forward it down al ink that isn't yet able
// to forward any HTLC's.
func TestSkipIneligibleLinksMultiHopForward(t *testing.T) {
tests := []multiHopFwdTest{
// None of the channels is eligible.
{
name: "not eligible",
expectedReply: lnwire.CodeUnknownNextPeer,
},
// Channel one has a policy failure and the other channel isn't
// available.
{
name: "policy fail",
eligible1: true,
failure1: NewLinkError(
lnwire.NewFinalIncorrectCltvExpiry(0),
),
expectedReply: lnwire.CodeFinalIncorrectCltvExpiry,
},
// The requested channel is not eligible, but the packet is
// forwarded through the other channel.
{
name: "non-strict success",
eligible2: true,
expectedReply: lnwire.CodeNone,
},
// The requested channel has insufficient bandwidth and the
// other channel's policy isn't satisfied.
{
name: "non-strict policy fail",
eligible1: true,
failure1: NewDetailedLinkError(
lnwire.NewTemporaryChannelFailure(nil),
OutgoingFailureInsufficientBalance,
),
eligible2: true,
failure2: NewLinkError(
lnwire.NewFinalIncorrectCltvExpiry(0),
),
expectedReply: lnwire.CodeTemporaryChannelFailure,
},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
testSkipIneligibleLinksMultiHopForward(t, &test)
})
}
}
// testSkipIneligibleLinksMultiHopForward tests that if a multi-hop HTLC comes
// along, then we won't attempt to forward it down al ink that isn't yet able
// to forward any HTLC's.
func testSkipIneligibleLinksMultiHopForward(t *testing.T,
testCase *multiHopFwdTest) {
t.Parallel()
var packet *htlcPacket
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, aliceChanID := genID()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
// We'll create a link for Bob, but mark the link as unable to forward
// any new outgoing HTLC's.
chanID2, bobChanID2 := genID()
bobChannelLink1 := newMockChannelLink(
s, chanID2, bobChanID2, bobPeer, testCase.eligible1,
)
bobChannelLink1.checkHtlcForwardResult = testCase.failure1
chanID3, bobChanID3 := genID()
bobChannelLink2 := newMockChannelLink(
s, chanID3, bobChanID3, bobPeer, testCase.eligible2,
)
bobChannelLink2.checkHtlcForwardResult = testCase.failure2
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink1); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
if err := s.AddLink(bobChannelLink2); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create a new packet that's destined for Bob as an incoming HTLC from
// Alice.
preimage := [sha256.Size]byte{1}
rhash := sha256.Sum256(preimage[:])
obfuscator := NewMockObfuscator()
packet = &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink1.ShortChanID(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
obfuscator: obfuscator,
}
// The request to forward should fail as
if err := s.ForwardPackets(nil, packet); err != nil {
t.Fatal(err)
}
// We select from all links and extract the error if exists.
// The packet must be selected but we don't always expect a link error.
var linkError *LinkError
select {
case p := <-aliceChannelLink.packets:
linkError = p.linkFailure
case p := <-bobChannelLink1.packets:
linkError = p.linkFailure
case p := <-bobChannelLink2.packets:
linkError = p.linkFailure
case <-time.After(time.Second):
t.Fatal("no timely reply from switch")
}
failure := obfuscator.(*mockObfuscator).failure
if testCase.expectedReply == lnwire.CodeNone {
if linkError != nil {
t.Fatalf("forwarding should have succeeded")
}
if failure != nil {
t.Fatalf("unexpected failure %T", failure)
}
} else {
if linkError == nil {
t.Fatalf("forwarding should have failed due to " +
"inactive link")
}
if failure.Code() != testCase.expectedReply {
t.Fatalf("unexpected failure %T", failure)
}
}
if s.circuits.NumOpen() != 0 {
t.Fatal("wrong amount of circuits")
}
}
// TestSkipIneligibleLinksLocalForward ensures that the switch will not attempt
// to forward any HTLC's down a link that isn't yet eligible for forwarding.
func TestSkipIneligibleLinksLocalForward(t *testing.T) {
t.Parallel()
testSkipLinkLocalForward(t, false, nil)
}
// TestSkipPolicyUnsatisfiedLinkLocalForward ensures that the switch will not
// attempt to send locally initiated HTLCs that would violate the channel policy
// down a link.
func TestSkipPolicyUnsatisfiedLinkLocalForward(t *testing.T) {
t.Parallel()
testSkipLinkLocalForward(t, true, lnwire.NewTemporaryChannelFailure(nil))
}
func testSkipLinkLocalForward(t *testing.T, eligible bool,
policyResult lnwire.FailureMessage) {
// We'll create a single link for this test, marking it as being unable
// to forward form the get go.
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, _, aliceChanID, _ := genIDs()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, eligible,
)
aliceChannelLink.checkHtlcTransitResult = NewLinkError(
policyResult,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
preimage, err := genPreimage()
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
rhash := sha256.Sum256(preimage[:])
addMsg := &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
}
// We'll attempt to send out a new HTLC that has Alice as the first
// outgoing link. This should fail as Alice isn't yet able to forward
// any active HTLC's.
err = s.SendHTLC(aliceChannelLink.ShortChanID(), 0, addMsg)
if err == nil {
t.Fatalf("local forward should fail due to inactive link")
}
if s.circuits.NumOpen() != 0 {
t.Fatal("wrong amount of circuits")
}
}
// TestSwitchCancel checks that if htlc was rejected we remove unused
// circuits.
func TestSwitchCancel(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarder from alice channel link
// to bob channel link.
preimage, err := genPreimage()
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
rhash := sha256.Sum256(preimage[:])
request := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, request); err != nil {
t.Fatal(err)
}
select {
case packet := <-bobChannelLink.packets:
if err := bobChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.NumPending() != 1 {
t.Fatalf("wrong amount of half circuits")
}
if s.circuits.NumOpen() != 1 {
t.Fatal("wrong amount of circuits")
}
// Create settle request pretending that bob channel link handled
// the add htlc request and sent the htlc settle request back. This
// request should be forwarder back to alice channel link.
request = &htlcPacket{
outgoingChanID: bobChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFailHTLC{},
}
// Handle the request and checks that payment circuit works properly.
if err := s.ForwardPackets(nil, request); err != nil {
t.Fatal(err)
}
select {
case pkt := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(pkt); err != nil {
t.Fatalf("unable to remove circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s.circuits.NumPending() != 0 {
t.Fatal("wrong amount of circuits")
}
if s.circuits.NumOpen() != 0 {
t.Fatal("wrong amount of circuits")
}
}
// TestSwitchAddSamePayment tests that we send the payment with the same
// payment hash.
func TestSwitchAddSamePayment(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarder from alice channel link
// to bob channel link.
preimage, err := genPreimage()
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
rhash := sha256.Sum256(preimage[:])
request := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, request); err != nil {
t.Fatal(err)
}
select {
case packet := <-bobChannelLink.packets:
if err := bobChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.NumOpen() != 1 {
t.Fatal("wrong amount of circuits")
}
request = &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 1,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
}
// Handle the request and checks that bob channel link received it.
if err := s.ForwardPackets(nil, request); err != nil {
t.Fatal(err)
}
select {
case packet := <-bobChannelLink.packets:
if err := bobChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.NumOpen() != 2 {
t.Fatal("wrong amount of circuits")
}
// Create settle request pretending that bob channel link handled
// the add htlc request and sent the htlc settle request back. This
// request should be forwarder back to alice channel link.
request = &htlcPacket{
outgoingChanID: bobChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFailHTLC{},
}
// Handle the request and checks that payment circuit works properly.
if err := s.ForwardPackets(nil, request); err != nil {
t.Fatal(err)
}
select {
case pkt := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(pkt); err != nil {
t.Fatalf("unable to remove circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s.circuits.NumOpen() != 1 {
t.Fatal("wrong amount of circuits")
}
request = &htlcPacket{
outgoingChanID: bobChannelLink.ShortChanID(),
outgoingHTLCID: 1,
amount: 1,
htlc: &lnwire.UpdateFailHTLC{},
}
// Handle the request and checks that payment circuit works properly.
if err := s.ForwardPackets(nil, request); err != nil {
t.Fatal(err)
}
select {
case pkt := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(pkt); err != nil {
t.Fatalf("unable to remove circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s.circuits.NumOpen() != 0 {
t.Fatal("wrong amount of circuits")
}
}
// TestSwitchSendPayment tests ability of htlc switch to respond to the
// users when response is came back from channel link.
func TestSwitchSendPayment(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, _, aliceChanID, _ := genIDs()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add link: %v", err)
}
// Create request which should be forwarder from alice channel link
// to bob channel link.
preimage, err := genPreimage()
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
rhash := sha256.Sum256(preimage[:])
update := &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
}
paymentID := uint64(123)
// First check that the switch will correctly respond that this payment
// ID is unknown.
_, err = s.GetPaymentResult(
paymentID, rhash, newMockDeobfuscator(),
)
if err != ErrPaymentIDNotFound {
t.Fatalf("expected ErrPaymentIDNotFound, got %v", err)
}
// Handle the request and checks that bob channel link received it.
errChan := make(chan error)
go func() {
err := s.SendHTLC(
aliceChannelLink.ShortChanID(), paymentID, update,
)
if err != nil {
errChan <- err
return
}
resultChan, err := s.GetPaymentResult(
paymentID, rhash, newMockDeobfuscator(),
)
if err != nil {
errChan <- err
return
}
result, ok := <-resultChan
if !ok {
errChan <- fmt.Errorf("shutting down")
}
if result.Error != nil {
errChan <- result.Error
return
}
errChan <- nil
}()
select {
case packet := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case err := <-errChan:
if err != nil {
t.Fatalf("unable to send payment: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.NumOpen() != 1 {
t.Fatal("wrong amount of circuits")
}
// Create fail request pretending that bob channel link handled
// the add htlc request with error and sent the htlc fail request
// back. This request should be forwarded back to alice channel link.
obfuscator := NewMockObfuscator()
failure := lnwire.NewFailIncorrectDetails(update.Amount, 100)
reason, err := obfuscator.EncryptFirstHop(failure)
if err != nil {
t.Fatalf("unable obfuscate failure: %v", err)
}
if s.IsForwardedHTLC(aliceChannelLink.ShortChanID(), update.ID) {
t.Fatal("htlc should be identified as not forwarded")
}
packet := &htlcPacket{
outgoingChanID: aliceChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFailHTLC{
Reason: reason,
},
}
if err := s.ForwardPackets(nil, packet); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
select {
case err := <-errChan:
assertFailureCode(
t, err, lnwire.CodeIncorrectOrUnknownPaymentDetails,
)
case <-time.After(time.Second):
t.Fatal("err wasn't received")
}
}
// TestLocalPaymentNoForwardingEvents tests that if we send a series of locally
// initiated payments, then they aren't reflected in the forwarding log.
func TestLocalPaymentNoForwardingEvents(t *testing.T) {
t.Parallel()
// First, we'll create our traditional three hop network. We'll only be
// interacting with and asserting the state of the first end point for
// this test.
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
// We'll now craft and send a payment from Alice to Bob.
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(
amount, testStartingHeight, n.firstBobChannelLink,
)
// With the payment crafted, we'll send it from Alice to Bob. We'll
// wait for Alice to receive the preimage for the payment before
// proceeding.
receiver := n.bobServer
firstHop := n.firstBobChannelLink.ShortChanID()
_, err = makePayment(
n.aliceServer, receiver, firstHop, hops, amount, htlcAmt,
totalTimelock,
).Wait(30 * time.Second)
if err != nil {
t.Fatalf("unable to make the payment: %v", err)
}
// At this point, we'll forcibly stop the three hop network. Doing
// this will cause any pending forwarding events to be flushed by the
// various switches in the network.
n.stop()
// With all the switches stopped, we'll fetch Alice's mock forwarding
// event log.
log, ok := n.aliceServer.htlcSwitch.cfg.FwdingLog.(*mockForwardingLog)
if !ok {
t.Fatalf("mockForwardingLog assertion failed")
}
log.Lock()
defer log.Unlock()
// If we examine the memory of the forwarding log, then it should be
// blank.
if len(log.events) != 0 {
t.Fatalf("log should have no events, instead has: %v",
spew.Sdump(log.events))
}
}
// TestMultiHopPaymentForwardingEvents tests that if we send a series of
// multi-hop payments via Alice->Bob->Carol. Then Bob properly logs forwarding
// events, while Alice and Carol don't.
func TestMultiHopPaymentForwardingEvents(t *testing.T) {
t.Parallel()
// First, we'll create our traditional three hop network.
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
// We'll make now 10 payments, of 100k satoshis each from Alice to
// Carol via Bob.
const numPayments = 10
finalAmt := lnwire.NewMSatFromSatoshis(100000)
htlcAmt, totalTimelock, hops := generateHops(
finalAmt, testStartingHeight, n.firstBobChannelLink,
n.carolChannelLink,
)
firstHop := n.firstBobChannelLink.ShortChanID()
for i := 0; i < numPayments/2; i++ {
_, err := makePayment(
n.aliceServer, n.carolServer, firstHop, hops, finalAmt,
htlcAmt, totalTimelock,
).Wait(30 * time.Second)
if err != nil {
t.Fatalf("unable to send payment: %v", err)
}
}
bobLog, ok := n.bobServer.htlcSwitch.cfg.FwdingLog.(*mockForwardingLog)
if !ok {
t.Fatalf("mockForwardingLog assertion failed")
}
// After sending 5 of the payments, trigger the forwarding ticker, to
// make sure the events are properly flushed.
bobTicker, ok := n.bobServer.htlcSwitch.cfg.FwdEventTicker.(*ticker.Force)
if !ok {
t.Fatalf("mockTicker assertion failed")
}
// We'll trigger the ticker, and wait for the events to appear in Bob's
// forwarding log.
timeout := time.After(15 * time.Second)
for {
select {
case bobTicker.Force <- time.Now():
case <-time.After(1 * time.Second):
t.Fatalf("unable to force tick")
}
// If all 5 events is found in Bob's log, we can break out and
// continue the test.
bobLog.Lock()
if len(bobLog.events) == 5 {
bobLog.Unlock()
break
}
bobLog.Unlock()
// Otherwise wait a little bit before checking again.
select {
case <-time.After(50 * time.Millisecond):
case <-timeout:
bobLog.Lock()
defer bobLog.Unlock()
t.Fatalf("expected 5 events in event log, instead "+
"found: %v", spew.Sdump(bobLog.events))
}
}
// Send the remaining payments.
for i := numPayments / 2; i < numPayments; i++ {
_, err := makePayment(
n.aliceServer, n.carolServer, firstHop, hops, finalAmt,
htlcAmt, totalTimelock,
).Wait(30 * time.Second)
if err != nil {
t.Fatalf("unable to send payment: %v", err)
}
}
// With all 10 payments sent. We'll now manually stop each of the
// switches so we can examine their end state.
n.stop()
// Alice and Carol shouldn't have any recorded forwarding events, as
// they were the source and the sink for these payment flows.
aliceLog, ok := n.aliceServer.htlcSwitch.cfg.FwdingLog.(*mockForwardingLog)
if !ok {
t.Fatalf("mockForwardingLog assertion failed")
}
aliceLog.Lock()
defer aliceLog.Unlock()
if len(aliceLog.events) != 0 {
t.Fatalf("log should have no events, instead has: %v",
spew.Sdump(aliceLog.events))
}
carolLog, ok := n.carolServer.htlcSwitch.cfg.FwdingLog.(*mockForwardingLog)
if !ok {
t.Fatalf("mockForwardingLog assertion failed")
}
carolLog.Lock()
defer carolLog.Unlock()
if len(carolLog.events) != 0 {
t.Fatalf("log should have no events, instead has: %v",
spew.Sdump(carolLog.events))
}
// Bob on the other hand, should have 10 events.
bobLog.Lock()
defer bobLog.Unlock()
if len(bobLog.events) != 10 {
t.Fatalf("log should have 10 events, instead has: %v",
spew.Sdump(bobLog.events))
}
// Each of the 10 events should have had all fields set properly.
for _, event := range bobLog.events {
// The incoming and outgoing channels should properly be set for
// the event.
if event.IncomingChanID != n.aliceChannelLink.ShortChanID() {
t.Fatalf("chan id mismatch: expected %v, got %v",
event.IncomingChanID,
n.aliceChannelLink.ShortChanID())
}
if event.OutgoingChanID != n.carolChannelLink.ShortChanID() {
t.Fatalf("chan id mismatch: expected %v, got %v",
event.OutgoingChanID,
n.carolChannelLink.ShortChanID())
}
// Additionally, the incoming and outgoing amounts should also
// be properly set.
if event.AmtIn != htlcAmt {
t.Fatalf("incoming amt mismatch: expected %v, got %v",
event.AmtIn, htlcAmt)
}
if event.AmtOut != finalAmt {
t.Fatalf("outgoing amt mismatch: expected %v, got %v",
event.AmtOut, finalAmt)
}
}
}
// TestUpdateFailMalformedHTLCErrorConversion tests that we're able to properly
// convert malformed HTLC errors that originate at the direct link, as well as
// during multi-hop HTLC forwarding.
func TestUpdateFailMalformedHTLCErrorConversion(t *testing.T) {
t.Parallel()
// First, we'll create our traditional three hop network.
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3, btcutil.SatoshiPerBitcoin*5,
)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(
t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight,
)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
assertPaymentFailure := func(t *testing.T) {
// With the decoder modified, we'll now attempt to send a
// payment from Alice to carol.
finalAmt := lnwire.NewMSatFromSatoshis(100000)
htlcAmt, totalTimelock, hops := generateHops(
finalAmt, testStartingHeight, n.firstBobChannelLink,
n.carolChannelLink,
)
firstHop := n.firstBobChannelLink.ShortChanID()
_, err = makePayment(
n.aliceServer, n.carolServer, firstHop, hops, finalAmt,
htlcAmt, totalTimelock,
).Wait(30 * time.Second)
// The payment should fail as Carol is unable to decode the
// onion blob sent to her.
if err == nil {
t.Fatalf("unable to send payment: %v", err)
}
routingErr := err.(ClearTextError)
failureMsg := routingErr.WireMessage()
if _, ok := failureMsg.(*lnwire.FailInvalidOnionKey); !ok {
t.Fatalf("expected onion failure instead got: %v",
routingErr.WireMessage())
}
}
t.Run("multi-hop error conversion", func(t *testing.T) {
// Now that we have our network up, we'll modify the hop
// iterator for the Bob <-> Carol channel to fail to decode in
// order to simulate either a replay attack or an issue
// decoding the onion.
n.carolOnionDecoder.decodeFail = true
assertPaymentFailure(t)
})
t.Run("direct channel error conversion", func(t *testing.T) {
// Similar to the above test case, we'll now make the Alice <->
// Bob link always fail to decode an onion. This differs from
// the above test case in that there's no encryption on the
// error at all since Alice will directly receive a
// UpdateFailMalformedHTLC message.
n.bobOnionDecoder.decodeFail = true
assertPaymentFailure(t)
})
}
// TestSwitchGetPaymentResult tests that the switch interacts as expected with
// the circuit map and network result store when looking up the result of a
// payment ID. This is important for not to lose results under concurrent
// lookup and receiving results.
func TestSwitchGetPaymentResult(t *testing.T) {
t.Parallel()
const paymentID = 123
var preimg lntypes.Preimage
preimg[0] = 3
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
lookup := make(chan *PaymentCircuit, 1)
s.circuits = &mockCircuitMap{
lookup: lookup,
}
// If the payment circuit is not found in the circuit map, the payment
// result must be found in the store if available. Since we haven't
// added anything to the store yet, ErrPaymentIDNotFound should be
// returned.
lookup <- nil
_, err = s.GetPaymentResult(
paymentID, lntypes.Hash{}, newMockDeobfuscator(),
)
if err != ErrPaymentIDNotFound {
t.Fatalf("expected ErrPaymentIDNotFound, got %v", err)
}
// Next let the lookup find the circuit in the circuit map. It should
// subscribe to payment results, and return the result when available.
lookup <- &PaymentCircuit{}
resultChan, err := s.GetPaymentResult(
paymentID, lntypes.Hash{}, newMockDeobfuscator(),
)
if err != nil {
t.Fatalf("unable to get payment result: %v", err)
}
// Add the result to the store.
n := &networkResult{
msg: &lnwire.UpdateFulfillHTLC{
PaymentPreimage: preimg,
},
unencrypted: true,
isResolution: true,
}
err = s.networkResults.storeResult(paymentID, n)
if err != nil {
t.Fatalf("unable to store result: %v", err)
}
// The result should be available.
select {
case res, ok := <-resultChan:
if !ok {
t.Fatalf("channel was closed")
}
if res.Error != nil {
t.Fatalf("got unexpected error result")
}
if res.Preimage != preimg {
t.Fatalf("expected preimg %v, got %v",
preimg, res.Preimage)
}
case <-time.After(1 * time.Second):
t.Fatalf("result not received")
}
// As a final test, try to get the result again. Now that is no longer
// in the circuit map, it should be immediately available from the
// store.
lookup <- nil
resultChan, err = s.GetPaymentResult(
paymentID, lntypes.Hash{}, newMockDeobfuscator(),
)
if err != nil {
t.Fatalf("unable to get payment result: %v", err)
}
select {
case res, ok := <-resultChan:
if !ok {
t.Fatalf("channel was closed")
}
if res.Error != nil {
t.Fatalf("got unexpected error result")
}
if res.Preimage != preimg {
t.Fatalf("expected preimg %v, got %v",
preimg, res.Preimage)
}
case <-time.After(1 * time.Second):
t.Fatalf("result not received")
}
}
// TestInvalidFailure tests that the switch returns an unreadable failure error
// if the failure cannot be decrypted.
func TestInvalidFailure(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, _, aliceChanID, _ := genIDs()
// Set up a mock channel link.
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add link: %v", err)
}
// Create a request which should be forwarded to the mock channel link.
preimage, err := genPreimage()
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
rhash := sha256.Sum256(preimage[:])
update := &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
}
paymentID := uint64(123)
// Send the request.
err = s.SendHTLC(
aliceChannelLink.ShortChanID(), paymentID, update,
)
if err != nil {
t.Fatalf("unable to send payment: %v", err)
}
// Catch the packet and complete the circuit so that the switch is ready
// for a response.
select {
case packet := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
// Send response packet with an unreadable failure message to the
// switch. The reason failed is not relevant, because we mock the
// decryption.
packet := &htlcPacket{
outgoingChanID: aliceChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFailHTLC{
Reason: []byte{1, 2, 3},
},
}
if err := s.ForwardPackets(nil, packet); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
// Get payment result from switch. We expect an unreadable failure
// message error.
deobfuscator := SphinxErrorDecrypter{
OnionErrorDecrypter: &mockOnionErrorDecryptor{
err: ErrUnreadableFailureMessage,
},
}
resultChan, err := s.GetPaymentResult(
paymentID, rhash, &deobfuscator,
)
if err != nil {
t.Fatal(err)
}
select {
case result := <-resultChan:
if result.Error != ErrUnreadableFailureMessage {
t.Fatal("expected unreadable failure message")
}
case <-time.After(time.Second):
t.Fatal("err wasn't received")
}
// Modify the decryption to simulate that decryption went alright, but
// the failure cannot be decoded.
deobfuscator = SphinxErrorDecrypter{
OnionErrorDecrypter: &mockOnionErrorDecryptor{
sourceIdx: 2,
message: []byte{200},
},
}
resultChan, err = s.GetPaymentResult(
paymentID, rhash, &deobfuscator,
)
if err != nil {
t.Fatal(err)
}
select {
case result := <-resultChan:
rtErr, ok := result.Error.(ClearTextError)
if !ok {
t.Fatal("expected ClearTextError")
}
source, ok := rtErr.(*ForwardingError)
if !ok {
t.Fatalf("expected forwarding error, got: %T", rtErr)
}
if source.FailureSourceIdx != 2 {
t.Fatal("unexpected error source index")
}
if rtErr.WireMessage() != nil {
t.Fatal("expected empty failure message")
}
case <-time.After(time.Second):
t.Fatal("err wasn't received")
}
}
// htlcNotifierEvents is a function that generates a set of expected htlc
// notifier evetns for each node in a three hop network with the dynamic
// values provided. These functions take dynamic values so that changes to
// external systems (such as our default timelock delta) do not break
// these tests.
type htlcNotifierEvents func(channels *clusterChannels, htlcID uint64,
ts time.Time, htlc *lnwire.UpdateAddHTLC,
hops []*hop.Payload,
preimage *lntypes.Preimage) ([]interface{}, []interface{}, []interface{})
// TestHtlcNotifier tests the notifying of htlc events that are routed over a
// three hop network. It sets up an Alice -> Bob -> Carol network and routes
// payments from Alice -> Carol to test events from the perspective of a
// sending (Alice), forwarding (Bob) and receiving (Carol) node. Test cases
// are present for saduccessful and failed payments.
func TestHtlcNotifier(t *testing.T) {
tests := []struct {
name string
// Options is a set of options to apply to the three hop
// network's servers.
options []serverOption
// expectedEvents is a function which returns an expected set
// of events for the test.
expectedEvents htlcNotifierEvents
// iterations is the number of times we will send a payment,
// this is used to send more than one payment to force non-
// zero htlc indexes to make sure we aren't just checking
// default values.
iterations int
}{
{
name: "successful three hop payment",
options: nil,
expectedEvents: func(channels *clusterChannels,
htlcID uint64, ts time.Time,
htlc *lnwire.UpdateAddHTLC,
hops []*hop.Payload,
preimage *lntypes.Preimage) ([]interface{},
[]interface{}, []interface{}) {
return getThreeHopEvents(
channels, htlcID, ts, htlc, hops, nil, preimage,
)
},
iterations: 2,
},
{
name: "failed at forwarding link",
// Set a functional option which disables bob as a
// forwarding node to force a payment error.
options: []serverOption{
serverOptionRejectHtlc(false, true, false),
},
expectedEvents: func(channels *clusterChannels,
htlcID uint64, ts time.Time,
htlc *lnwire.UpdateAddHTLC,
hops []*hop.Payload,
preimage *lntypes.Preimage) ([]interface{},
[]interface{}, []interface{}) {
return getThreeHopEvents(
channels, htlcID, ts, htlc, hops,
&LinkError{
msg: &lnwire.FailChannelDisabled{},
FailureDetail: OutgoingFailureForwardsDisabled,
},
preimage,
)
},
iterations: 1,
},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
testHtcNotifier(
t, test.options, test.iterations,
test.expectedEvents,
)
})
}
}
// testHtcNotifier runs a htlc notifier test.
func testHtcNotifier(t *testing.T, testOpts []serverOption, iterations int,
getEvents htlcNotifierEvents) {
t.Parallel()
// First, we'll create our traditional three hop
// network.
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
// Mock time so that all events are reported with a static timestamp.
now := time.Now()
mockTime := func() time.Time {
return now
}
// Create htlc notifiers for each server in the three hop network and
// start them.
aliceNotifier := NewHtlcNotifier(mockTime)
if err := aliceNotifier.Start(); err != nil {
t.Fatalf("could not start alice notifier")
}
defer func() {
if err := aliceNotifier.Stop(); err != nil {
t.Fatalf("failed to stop alice notifier: %v", err)
}
}()
bobNotifier := NewHtlcNotifier(mockTime)
if err := bobNotifier.Start(); err != nil {
t.Fatalf("could not start bob notifier")
}
defer func() {
if err := bobNotifier.Stop(); err != nil {
t.Fatalf("failed to stop bob notifier: %v", err)
}
}()
carolNotifier := NewHtlcNotifier(mockTime)
if err := carolNotifier.Start(); err != nil {
t.Fatalf("could not start carol notifier")
}
defer func() {
if err := carolNotifier.Stop(); err != nil {
t.Fatalf("failed to stop carol notifier: %v", err)
}
}()
// Create a notifier server option which will set our htlc notifiers
// for the three hop network.
notifierOption := serverOptionWithHtlcNotifier(
aliceNotifier, bobNotifier, carolNotifier,
)
// Add the htlcNotifier option to any other options
// set in the test.
options := append(testOpts, notifierOption) // nolint:gocritic
n := newThreeHopNetwork(
t, channels.aliceToBob,
channels.bobToAlice, channels.bobToCarol,
channels.carolToBob, testStartingHeight,
options...,
)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop "+
"network: %v", err)
}
defer n.stop()
// Before we forward anything, subscribe to htlc events
// from each notifier.
aliceEvents, err := aliceNotifier.SubscribeHtlcEvents()
if err != nil {
t.Fatalf("could not subscribe to alice's"+
" events: %v", err)
}
defer aliceEvents.Cancel()
bobEvents, err := bobNotifier.SubscribeHtlcEvents()
if err != nil {
t.Fatalf("could not subscribe to bob's"+
" events: %v", err)
}
defer bobEvents.Cancel()
carolEvents, err := carolNotifier.SubscribeHtlcEvents()
if err != nil {
t.Fatalf("could not subscribe to carol's"+
" events: %v", err)
}
defer carolEvents.Cancel()
// Send multiple payments, as specified by the test to test incrementing
// of htlc ids.
for i := 0; i < iterations; i++ {
// We'll start off by making a payment from
// Alice -> Bob -> Carol. The preimage, generated
// by Carol's Invoice is expected in the Settle events
htlc, hops, preimage := n.sendThreeHopPayment(t)
alice, bob, carol := getEvents(
channels, uint64(i), now, htlc, hops, preimage,
)
checkHtlcEvents(t, aliceEvents.Updates(), alice)
checkHtlcEvents(t, bobEvents.Updates(), bob)
checkHtlcEvents(t, carolEvents.Updates(), carol)
}
}
// checkHtlcEvents checks that a subscription has the set of htlc events
// we expect it to have.
func checkHtlcEvents(t *testing.T, events <-chan interface{},
expectedEvents []interface{}) {
t.Helper()
for _, expected := range expectedEvents {
select {
case event := <-events:
if !reflect.DeepEqual(event, expected) {
t.Fatalf("expected %v, got: %v", expected,
event)
}
case <-time.After(5 * time.Second):
t.Fatalf("expected event: %v", expected)
}
}
}
// sendThreeHopPayment is a helper function which sends a payment over
// Alice -> Bob -> Carol in a three hop network and returns Alice's first htlc
// and the remainder of the hops.
func (n *threeHopNetwork) sendThreeHopPayment(t *testing.T) (*lnwire.UpdateAddHTLC,
[]*hop.Payload, *lntypes.Preimage) {
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
blob, err := generateRoute(hops...)
if err != nil {
t.Fatal(err)
}
invoice, htlc, pid, err := generatePayment(
amount, htlcAmt, totalTimelock, blob,
)
if err != nil {
t.Fatal(err)
}
err = n.carolServer.registry.AddInvoice(*invoice, htlc.PaymentHash)
if err != nil {
t.Fatalf("unable to add invoice in carol registry: %v", err)
}
if err := n.aliceServer.htlcSwitch.SendHTLC(
n.firstBobChannelLink.ShortChanID(), pid, htlc,
); err != nil {
t.Fatalf("could not send htlc")
}
return htlc, hops, invoice.Terms.PaymentPreimage
}
// getThreeHopEvents gets the set of htlc events that we expect for a payment
// from Alice -> Bob -> Carol. If a non-nil link error is provided, the set
// of events will fail on Bob's outgoing link.
func getThreeHopEvents(channels *clusterChannels, htlcID uint64,
ts time.Time, htlc *lnwire.UpdateAddHTLC, hops []*hop.Payload,
linkError *LinkError,
preimage *lntypes.Preimage) ([]interface{}, []interface{}, []interface{}) {
aliceKey := HtlcKey{
IncomingCircuit: zeroCircuit,
OutgoingCircuit: channeldb.CircuitKey{
ChanID: channels.aliceToBob.ShortChanID(),
HtlcID: htlcID,
},
}
// Alice always needs a forwarding event because she initiates the
// send.
aliceEvents := []interface{}{
&ForwardingEvent{
HtlcKey: aliceKey,
HtlcInfo: HtlcInfo{
OutgoingTimeLock: htlc.Expiry,
OutgoingAmt: htlc.Amount,
},
HtlcEventType: HtlcEventTypeSend,
Timestamp: ts,
},
}
bobKey := HtlcKey{
IncomingCircuit: channeldb.CircuitKey{
ChanID: channels.bobToAlice.ShortChanID(),
HtlcID: htlcID,
},
OutgoingCircuit: channeldb.CircuitKey{
ChanID: channels.bobToCarol.ShortChanID(),
HtlcID: htlcID,
},
}
bobInfo := HtlcInfo{
IncomingTimeLock: htlc.Expiry,
IncomingAmt: htlc.Amount,
OutgoingTimeLock: hops[1].FwdInfo.OutgoingCTLV,
OutgoingAmt: hops[1].FwdInfo.AmountToForward,
}
// If we expect the payment to fail, we add failures for alice and
// bob, and no events for carol because the payment never reaches her.
if linkError != nil {
aliceEvents = append(aliceEvents,
&ForwardingFailEvent{
HtlcKey: aliceKey,
HtlcEventType: HtlcEventTypeSend,
Timestamp: ts,
},
)
bobEvents := []interface{}{
&LinkFailEvent{
HtlcKey: bobKey,
HtlcInfo: bobInfo,
HtlcEventType: HtlcEventTypeForward,
LinkError: linkError,
Incoming: false,
Timestamp: ts,
},
}
return aliceEvents, bobEvents, nil
}
// If we want to get events for a successful payment, we add a settle
// for alice, a forward and settle for bob and a receive settle for
// carol.
aliceEvents = append(
aliceEvents,
&SettleEvent{
HtlcKey: aliceKey,
Preimage: *preimage,
HtlcEventType: HtlcEventTypeSend,
Timestamp: ts,
},
)
bobEvents := []interface{}{
&ForwardingEvent{
HtlcKey: bobKey,
HtlcInfo: bobInfo,
HtlcEventType: HtlcEventTypeForward,
Timestamp: ts,
},
&SettleEvent{
HtlcKey: bobKey,
Preimage: *preimage,
HtlcEventType: HtlcEventTypeForward,
Timestamp: ts,
},
}
carolEvents := []interface{}{
&SettleEvent{
HtlcKey: HtlcKey{
IncomingCircuit: channeldb.CircuitKey{
ChanID: channels.carolToBob.ShortChanID(),
HtlcID: htlcID,
},
OutgoingCircuit: zeroCircuit,
},
Preimage: *preimage,
HtlcEventType: HtlcEventTypeReceive,
Timestamp: ts,
},
}
return aliceEvents, bobEvents, carolEvents
}
type mockForwardInterceptor struct {
intercepted InterceptedForward
}
func (m *mockForwardInterceptor) InterceptForwardHtlc(
intercepted InterceptedForward) bool {
m.intercepted = intercepted
return true
}
func (m *mockForwardInterceptor) settle(preimage lntypes.Preimage) error {
return m.intercepted.Settle(preimage)
}
func (m *mockForwardInterceptor) fail(reason []byte) error {
return m.intercepted.Fail(reason)
}
func (m *mockForwardInterceptor) failWithCode(
code lnwire.FailCode) error {
return m.intercepted.FailWithCode(code)
}
func (m *mockForwardInterceptor) resume() error {
return m.intercepted.Resume()
}
func assertNumCircuits(t *testing.T, s *Switch, pending, opened int) {
if s.circuits.NumPending() != pending {
t.Fatal("wrong amount of half circuits")
}
if s.circuits.NumOpen() != opened {
t.Fatal("wrong amount of circuits")
}
}
func assertOutgoingLinkReceive(t *testing.T, targetLink *mockChannelLink,
expectReceive bool) *htlcPacket {
// Pull packet from targetLink link.
select {
case packet := <-targetLink.packets:
if !expectReceive {
t.Fatal("forward was intercepted, shouldn't land at bob link")
} else if err := targetLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
return packet
case <-time.After(time.Second):
if expectReceive {
t.Fatal("request was not propagated to destination")
}
}
return nil
}
func TestSwitchHoldForward(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
tempPath, err := ioutil.TempDir("", "circuitdb")
if err != nil {
t.Fatalf("unable to temporary path: %v", err)
}
cdb, err := channeldb.Open(tempPath)
if err != nil {
t.Fatalf("unable to open channeldb: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, cdb)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer func() {
if err := s.Stop(); err != nil {
t.Fatalf(err.Error())
}
}()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
if err := s.AddLink(bobChannelLink); err != nil {
t.Fatalf("unable to add bob link: %v", err)
}
// Create request which should be forwarded from Alice channel link to
// bob channel link.
preimage := [sha256.Size]byte{1}
rhash := sha256.Sum256(preimage[:])
onionBlob := [1366]byte{4, 5, 6}
ogPacket := &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
OnionBlob: onionBlob,
},
}
forwardInterceptor := &mockForwardInterceptor{}
switchForwardInterceptor := NewInterceptableSwitch(s)
switchForwardInterceptor.SetInterceptor(forwardInterceptor.InterceptForwardHtlc)
linkQuit := make(chan struct{})
// Test resume a hold forward
assertNumCircuits(t, s, 0, 0)
if err := switchForwardInterceptor.ForwardPackets(linkQuit, ogPacket); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
assertNumCircuits(t, s, 0, 0)
assertOutgoingLinkReceive(t, bobChannelLink, false)
if err := forwardInterceptor.resume(); err != nil {
t.Fatalf("failed to resume forward")
}
assertOutgoingLinkReceive(t, bobChannelLink, true)
assertNumCircuits(t, s, 1, 1)
// settling the htlc to close the circuit.
settle := &htlcPacket{
outgoingChanID: bobChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFulfillHTLC{
PaymentPreimage: preimage,
},
}
if err := switchForwardInterceptor.ForwardPackets(linkQuit, settle); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
assertOutgoingLinkReceive(t, aliceChannelLink, true)
assertNumCircuits(t, s, 0, 0)
// Test failing a hold forward
if err := switchForwardInterceptor.ForwardPackets(linkQuit, ogPacket); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
assertNumCircuits(t, s, 0, 0)
assertOutgoingLinkReceive(t, bobChannelLink, false)
if err := forwardInterceptor.fail(nil); err != nil {
t.Fatalf("failed to cancel forward %v", err)
}
assertOutgoingLinkReceive(t, bobChannelLink, false)
assertOutgoingLinkReceive(t, aliceChannelLink, true)
assertNumCircuits(t, s, 0, 0)
// Test failing a hold forward with a failure message.
require.NoError(t,
switchForwardInterceptor.ForwardPackets(linkQuit, ogPacket),
)
assertNumCircuits(t, s, 0, 0)
assertOutgoingLinkReceive(t, bobChannelLink, false)
reason := lnwire.OpaqueReason([]byte{1, 2, 3})
require.NoError(t, forwardInterceptor.fail(reason))
assertOutgoingLinkReceive(t, bobChannelLink, false)
packet := assertOutgoingLinkReceive(t, aliceChannelLink, true)
require.Equal(t, reason, packet.htlc.(*lnwire.UpdateFailHTLC).Reason)
assertNumCircuits(t, s, 0, 0)
// Test failing a hold forward with a malformed htlc failure.
err = switchForwardInterceptor.ForwardPackets(linkQuit, ogPacket)
require.NoError(t, err)
assertNumCircuits(t, s, 0, 0)
assertOutgoingLinkReceive(t, bobChannelLink, false)
code := lnwire.CodeInvalidOnionKey
require.NoError(t, forwardInterceptor.failWithCode(code))
assertOutgoingLinkReceive(t, bobChannelLink, false)
packet = assertOutgoingLinkReceive(t, aliceChannelLink, true)
failPacket := packet.htlc.(*lnwire.UpdateFailHTLC)
shaOnionBlob := sha256.Sum256(onionBlob[:])
expectedFailure := &lnwire.FailInvalidOnionKey{
OnionSHA256: shaOnionBlob,
}
var b bytes.Buffer
require.NoError(t, lnwire.EncodeFailure(&b, expectedFailure, 0))
assert.Equal(t, lnwire.OpaqueReason(b.Bytes()), failPacket.Reason)
assertNumCircuits(t, s, 0, 0)
// Test settling a hold forward
if err := switchForwardInterceptor.ForwardPackets(linkQuit, ogPacket); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
assertNumCircuits(t, s, 0, 0)
assertOutgoingLinkReceive(t, bobChannelLink, false)
if err := forwardInterceptor.settle(preimage); err != nil {
t.Fatal("failed to cancel forward")
}
assertOutgoingLinkReceive(t, bobChannelLink, false)
assertOutgoingLinkReceive(t, aliceChannelLink, true)
assertNumCircuits(t, s, 0, 0)
}
// TestSwitchDustForwarding tests that the switch properly fails HTLC's which
// have incoming or outgoing links that breach their dust thresholds.
func TestSwitchDustForwarding(t *testing.T) {
t.Parallel()
// We'll create a three-hop network:
// - Alice has a dust limit of 200sats with Bob
// - Bob has a dust limit of 800sats with Alice
// - Bob has a dust limit of 200sats with Carol
// - Carol has a dust limit of 800sats with Bob
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin, btcutil.SatoshiPerBitcoin,
)
require.NoError(t, err)
defer cleanUp()
n := newThreeHopNetwork(
t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight,
)
err = n.start()
require.NoError(t, err)
// We'll also put Alice and Bob into hodl.ExitSettle mode, such that
// they won't settle incoming exit-hop HTLC's automatically.
n.aliceChannelLink.cfg.HodlMask = hodl.ExitSettle.Mask()
n.firstBobChannelLink.cfg.HodlMask = hodl.ExitSettle.Mask()
// We'll test that once the default threshold is exceeded on the
// Alice -> Bob channel, either side's calls to SendHTLC will fail.
// This does not rely on the mailbox sum since there's no intermediate
// hop.
//
// Alice will send 357 HTLC's of 700sats. Bob will also send 357 HTLC's
// of 700sats. If either side attempts to send a dust HTLC, it will
// fail so amounts below 800sats will breach the dust threshold.
amt := lnwire.NewMSatFromSatoshis(700)
aliceBobFirstHop := n.aliceChannelLink.ShortChanID()
sendDustHtlcs(t, n, true, amt, aliceBobFirstHop)
sendDustHtlcs(t, n, false, amt, aliceBobFirstHop)
// Generate the parameters needed for Bob to send another dust HTLC.
_, timelock, hops := generateHops(
amt, testStartingHeight, n.aliceChannelLink,
)
blob, err := generateRoute(hops...)
require.NoError(t, err)
// Assert that if Bob sends a dust HTLC it will fail.
failingPreimage := lntypes.Preimage{0, 0, 3}
failingHash := failingPreimage.Hash()
failingHtlc := &lnwire.UpdateAddHTLC{
PaymentHash: failingHash,
Amount: amt,
Expiry: timelock,
OnionBlob: blob,
}
// Assert that the HTLC is failed due to the dust threshold.
err = n.bobServer.htlcSwitch.SendHTLC(
aliceBobFirstHop, uint64(357), failingHtlc,
)
require.ErrorIs(t, err, errDustThresholdExceeded)
// Generate the parameters needed for bob to send a non-dust HTLC.
nondustAmt := lnwire.NewMSatFromSatoshis(10_000)
_, _, hops = generateHops(
nondustAmt, testStartingHeight, n.aliceChannelLink,
)
blob, err = generateRoute(hops...)
require.NoError(t, err)
// Now attempt to send an HTLC above Bob's dust limit. It should
// succeed.
nondustPreimage := lntypes.Preimage{0, 0, 4}
nondustHash := nondustPreimage.Hash()
nondustHtlc := &lnwire.UpdateAddHTLC{
PaymentHash: nondustHash,
Amount: nondustAmt,
Expiry: timelock,
OnionBlob: blob,
}
// Assert that SendHTLC succeeds and evaluateDustThreshold returns
// false.
err = n.bobServer.htlcSwitch.SendHTLC(
aliceBobFirstHop, uint64(358), nondustHtlc,
)
require.NoError(t, err)
// Introduce Carol into the mix and assert that sending a multi-hop
// dust HTLC to Alice will fail. Bob should fail back the HTLC with a
// temporary channel failure.
carolAmt, carolTimelock, carolHops := generateHops(
amt, testStartingHeight, n.secondBobChannelLink,
n.aliceChannelLink,
)
carolBlob, err := generateRoute(carolHops...)
require.NoError(t, err)
carolPreimage := lntypes.Preimage{0, 0, 5}
carolHash := carolPreimage.Hash()
carolHtlc := &lnwire.UpdateAddHTLC{
PaymentHash: carolHash,
Amount: carolAmt,
Expiry: carolTimelock,
OnionBlob: carolBlob,
}
// Initialize Carol's attempt ID.
carolAttemptID := 0
err = n.carolServer.htlcSwitch.SendHTLC(
n.carolChannelLink.ShortChanID(), uint64(carolAttemptID),
carolHtlc,
)
require.NoError(t, err)
carolAttemptID++
carolResultChan, err := n.carolServer.htlcSwitch.GetPaymentResult(
uint64(carolAttemptID-1), carolHash, newMockDeobfuscator(),
)
require.NoError(t, err)
result, ok := <-carolResultChan
require.True(t, ok)
assertFailureCode(
t, result.Error, lnwire.CodeTemporaryChannelFailure,
)
// Send an HTLC from Alice to Carol and assert that it is failed at the
// call to SendHTLC.
htlcAmt, totalTimelock, aliceHops := generateHops(
amt, testStartingHeight, n.firstBobChannelLink,
n.carolChannelLink,
)
blob, err = generateRoute(aliceHops...)
require.NoError(t, err)
aliceMultihopPreimage := lntypes.Preimage{0, 0, 6}
aliceMultihopHash := aliceMultihopPreimage.Hash()
aliceMultihopHtlc := &lnwire.UpdateAddHTLC{
PaymentHash: aliceMultihopHash,
Amount: htlcAmt,
Expiry: totalTimelock,
OnionBlob: blob,
}
err = n.aliceServer.htlcSwitch.SendHTLC(
n.aliceChannelLink.ShortChanID(), uint64(357),
aliceMultihopHtlc,
)
require.ErrorIs(t, err, errDustThresholdExceeded)
}
// sendDustHtlcs is a helper function used to send many dust HTLC's to test the
// Switch's dust-threshold logic. It takes a boolean denoting whether or not
// Alice is the sender.
func sendDustHtlcs(t *testing.T, n *threeHopNetwork, alice bool,
amt lnwire.MilliSatoshi, sid lnwire.ShortChannelID) {
t.Helper()
// The number of dust HTLC's we'll send for both Alice and Bob.
numHTLCs := 357
// Extract the destination into a variable. If alice is the sender, the
// destination is Bob.
destLink := n.aliceChannelLink
if alice {
destLink = n.firstBobChannelLink
}
// Create hops that will be used in the onion payload.
htlcAmt, totalTimelock, hops := generateHops(
amt, testStartingHeight, destLink,
)
// Convert the hops to a blob that will be put in the Add message.
blob, err := generateRoute(hops...)
require.NoError(t, err)
// Create a slice to store the preimages.
preimages := make([]lntypes.Preimage, numHTLCs)
// Initialize the attempt ID used in SendHTLC calls.
attemptID := uint64(0)
// Deterministically generate preimages. Avoid the all-zeroes preimage
// because that will be rejected by the database. We'll use a different
// third byte for Alice and Bob.
endByte := byte(2)
if alice {
endByte = byte(3)
}
for i := 0; i < numHTLCs; i++ {
preimages[i] = lntypes.Preimage{byte(i >> 8), byte(i), endByte}
}
sendingSwitch := n.bobServer.htlcSwitch
if alice {
sendingSwitch = n.aliceServer.htlcSwitch
}
// Call SendHTLC in a loop for numHTLCs.
for i := 0; i < numHTLCs; i++ {
// Construct the htlc packet.
hash := preimages[i].Hash()
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: hash,
Amount: htlcAmt,
Expiry: totalTimelock,
OnionBlob: blob,
}
err = sendingSwitch.SendHTLC(sid, attemptID, htlc)
require.NoError(t, err)
attemptID++
}
}
// TestSwitchMailboxDust tests that the switch takes into account the mailbox
// dust when evaluating the dust threshold. The mockChannelLink does not have
// channel state, so this only tests the switch-mailbox interaction.
func TestSwitchMailboxDust(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(
t, "alice", testStartingHeight, nil, testDefaultDelta,
)
require.NoError(t, err)
bobPeer, err := newMockServer(
t, "bob", testStartingHeight, nil, testDefaultDelta,
)
require.NoError(t, err)
carolPeer, err := newMockServer(
t, "carol", testStartingHeight, nil, testDefaultDelta,
)
require.NoError(t, err)
s, err := initSwitchWithDB(testStartingHeight, nil)
require.NoError(t, err)
err = s.Start()
require.NoError(t, err)
defer func() {
_ = s.Stop()
}()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
chanID3, carolChanID := genID()
aliceLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
err = s.AddLink(aliceLink)
require.NoError(t, err)
bobLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, true,
)
err = s.AddLink(bobLink)
require.NoError(t, err)
carolLink := newMockChannelLink(
s, chanID3, carolChanID, carolPeer, true,
)
err = s.AddLink(carolLink)
require.NoError(t, err)
// mockChannelLink sets the local and remote dust limits of the mailbox
// to 400 satoshis and the feerate to 0. We'll fill the mailbox up with
// dust packets and assert that calls to SendHTLC will fail.
preimage, err := genPreimage()
require.NoError(t, err)
rhash := sha256.Sum256(preimage[:])
amt := lnwire.NewMSatFromSatoshis(350)
addMsg := &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: amt,
ChanID: chanID1,
}
// Initialize the carolHTLCID.
var carolHTLCID uint64
// It will take aliceCount HTLC's of 350sats to fill up Alice's mailbox
// to the point where another would put Alice over the dust threshold.
aliceCount := 1428
mailbox := s.mailOrchestrator.GetOrCreateMailBox(chanID1, aliceChanID)
for i := 0; i < aliceCount; i++ {
alicePkt := &htlcPacket{
incomingChanID: carolChanID,
incomingHTLCID: carolHTLCID,
outgoingChanID: aliceChanID,
obfuscator: NewMockObfuscator(),
incomingAmount: amt,
amount: amt,
htlc: addMsg,
}
err = mailbox.AddPacket(alicePkt)
require.NoError(t, err)
carolHTLCID++
}
// Sending one more HTLC to Alice should result in the dust threshold
// being breached.
err = s.SendHTLC(aliceChanID, 0, addMsg)
require.ErrorIs(t, err, errDustThresholdExceeded)
// We'll now call ForwardPackets from Bob to ensure that the mailbox
// sum is also accounted for in the forwarding case.
packet := &htlcPacket{
incomingChanID: bobChanID,
incomingHTLCID: 0,
outgoingChanID: aliceChanID,
obfuscator: NewMockObfuscator(),
incomingAmount: amt,
amount: amt,
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: amt,
ChanID: chanID1,
},
}
err = s.ForwardPackets(nil, packet)
require.NoError(t, err)
// Bob should receive a failure from the switch.
select {
case p := <-bobLink.packets:
require.NotEmpty(t, p.linkFailure)
assertFailureCode(
t, p.linkFailure, lnwire.CodeTemporaryChannelFailure,
)
case <-time.After(5 * time.Second):
t.Fatal("no timely reply from switch")
}
}
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