lnd.xprv/htlcswitch/switch_test.go

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package htlcswitch
import (
"bytes"
"crypto/sha256"
"testing"
"time"
"github.com/btcsuite/fastsha256"
"github.com/go-errors/errors"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/roasbeef/btcd/chaincfg/chainhash"
"github.com/roasbeef/btcd/wire"
)
var (
hash1, _ = chainhash.NewHash(bytes.Repeat([]byte("a"), 32))
hash2, _ = chainhash.NewHash(bytes.Repeat([]byte("b"), 32))
chanPoint1 = wire.NewOutPoint(hash1, 0)
chanPoint2 = wire.NewOutPoint(hash2, 0)
chanID1 = lnwire.NewChanIDFromOutPoint(chanPoint1)
chanID2 = lnwire.NewChanIDFromOutPoint(chanPoint2)
aliceChanID = lnwire.NewShortChanIDFromInt(1)
bobChanID = lnwire.NewShortChanIDFromInt(2)
)
// TestSwitchForward checks the ability of htlc switch to forward add/settle
// requests.
func TestSwitchForward(t *testing.T) {
t.Parallel()
alicePeer := newMockServer(t, "alice")
bobPeer := newMockServer(t, "bob")
s := New(Config{})
s.Start()
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 := fastsha256.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.forward(packet); err != nil {
t.Fatal(err)
}
select {
case <-bobChannelLink.packets:
break
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.pending() != 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.
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.forward(packet); err != nil {
t.Fatal(err)
}
select {
case <-aliceChannelLink.packets:
break
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s.circuits.pending() != 0 {
t.Fatal("wrong amount of circuits")
}
}
// TestSkipIneligibleLinksMultiHopForward tests that if a multi-hop HTLC comes
// along, then we won't attempt to froward it down al ink that isn't yet able
// to forward any HTLC's.
func TestSkipIneligibleLinksMultiHopForward(t *testing.T) {
t.Parallel()
var packet *htlcPacket
alicePeer := newMockServer(t, "alice")
bobPeer := newMockServer(t, "bob")
s := New(Config{})
s.Start()
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.
bobChannelLink := newMockChannelLink(
s, chanID2, bobChanID, bobPeer, false,
)
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 a new packet that's destined for Bob as an incoming HTLC from
// Alice.
preimage := [sha256.Size]byte{1}
rhash := fastsha256.Sum256(preimage[:])
packet = &htlcPacket{
incomingChanID: aliceChannelLink.ShortChanID(),
incomingHTLCID: 0,
outgoingChanID: bobChannelLink.ShortChanID(),
htlc: &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
},
obfuscator: newMockObfuscator(),
}
// The request to forward should fail as
err := s.forward(packet)
if err == nil {
t.Fatalf("forwarding should have failed due to inactive link")
}
if s.circuits.pending() != 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()
// We'll create a single link for this test, marking it as being unable
// to forward form the get go.
alicePeer := newMockServer(t, "alice")
s := New(Config{})
s.Start()
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, false,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice link: %v", err)
}
preimage := [sha256.Size]byte{1}
rhash := fastsha256.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.
alicePub := aliceChannelLink.Peer().PubKey()
_, err := s.SendHTLC(alicePub, addMsg, nil)
if err == nil {
t.Fatalf("local forward should fail due to inactive link")
}
if s.circuits.pending() != 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 := newMockServer(t, "alice")
bobPeer := newMockServer(t, "bob")
s := New(Config{})
s.Start()
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 := [sha256.Size]byte{1}
rhash := fastsha256.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.forward(request); err != nil {
t.Fatal(err)
}
select {
case <-bobChannelLink.packets:
break
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.pending() != 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.forward(request); err != nil {
t.Fatal(err)
}
select {
case <-aliceChannelLink.packets:
break
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s.circuits.pending() != 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()
alicePeer := newMockServer(t, "alice")
bobPeer := newMockServer(t, "bob")
s := New(Config{})
s.Start()
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 := [sha256.Size]byte{1}
rhash := fastsha256.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.forward(request); err != nil {
t.Fatal(err)
}
select {
case <-bobChannelLink.packets:
break
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.circuits.pending() != 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.forward(request); err != nil {
t.Fatal(err)
}
if s.circuits.pending() != 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.forward(request); err != nil {
t.Fatal(err)
}
select {
case <-aliceChannelLink.packets:
break
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s.circuits.pending() != 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.forward(request); err != nil {
t.Fatal(err)
}
select {
case <-aliceChannelLink.packets:
break
case <-time.After(time.Second):
t.Fatal("request was not propagated to channelPoint")
}
if s.circuits.pending() != 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 := newMockServer(t, "alice")
s := New(Config{})
s.Start()
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 := [sha256.Size]byte{1}
rhash := fastsha256.Sum256(preimage[:])
update := &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
}
// Handle the request and checks that bob channel link received it.
errChan := make(chan error)
go func() {
_, err := s.SendHTLC(aliceChannelLink.Peer().PubKey(), update,
newMockDeobfuscator())
errChan <- err
}()
go func() {
// Send the payment with the same payment hash and same
// amount and check that it will be propagated successfully
_, err := s.SendHTLC(aliceChannelLink.Peer().PubKey(), update,
newMockDeobfuscator())
errChan <- err
}()
select {
case <-aliceChannelLink.packets:
break
case err := <-errChan:
t.Fatalf("unable to send payment: %v", err)
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
select {
case <-aliceChannelLink.packets:
break
case err := <-errChan:
t.Fatalf("unable to send payment: %v", err)
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.numPendingPayments() != 2 {
t.Fatal("wrong amount of pending payments")
}
if s.circuits.pending() != 2 {
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.FailIncorrectPaymentAmount{}
reason, err := obfuscator.EncryptFirstHop(failure)
if err != nil {
t.Fatalf("unable obfuscate failure: %v", err)
}
packet := &htlcPacket{
outgoingChanID: aliceChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFailHTLC{
Reason: reason,
},
}
if err := s.forward(packet); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
select {
case err := <-errChan:
if err.Error() != errors.New(lnwire.CodeIncorrectPaymentAmount).Error() {
t.Fatal("err wasn't received")
}
case <-time.After(time.Second):
t.Fatal("err wasn't received")
}
packet = &htlcPacket{
outgoingChanID: aliceChannelLink.ShortChanID(),
outgoingHTLCID: 1,
htlc: &lnwire.UpdateFailHTLC{
Reason: reason,
},
}
// Send second failure response and check that user were able to
// receive the error.
if err := s.forward(packet); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
select {
case err := <-errChan:
if err.Error() != errors.New(lnwire.CodeIncorrectPaymentAmount).Error() {
t.Fatal("err wasn't received")
}
case <-time.After(time.Second):
t.Fatal("err wasn't received")
}
if s.numPendingPayments() != 0 {
t.Fatal("wrong amount of pending payments")
}
}