lnd.xprv/htlcswitch/switch_test.go

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package htlcswitch
import (
"crypto/rand"
"crypto/sha256"
"fmt"
"io"
"io/ioutil"
"strings"
"testing"
"time"
2018-07-31 10:17:17 +03:00
"github.com/btcsuite/btcutil"
"github.com/btcsuite/fastsha256"
"github.com/davecgh/go-spew/spew"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/ticker"
)
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, 6)
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, 6)
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, 6)
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, 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)
}
// 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 := fastsha256.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.
err = s.forward(packet)
expErr := fmt.Sprintf("unable to find link with destination %v",
aliceChanID)
if err != nil && err.Error() != expErr {
t.Fatalf("expected forward failure: %v", err)
}
// 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.forward(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, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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 := 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:
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")
}
// 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 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, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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 := fastsha256.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.forward(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.forward(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 := s2.forward(fail); err == nil {
t.Fatalf("expected failure when sending duplicate fail " +
"with no pending circuit")
}
}
func TestSwitchForwardSettleAfterFullAdd(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(t, "alice", testStartingHeight, nil, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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 := fastsha256.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.forward(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.forward(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 should fail.
if err := s2.forward(settle); err == nil {
t.Fatalf("expected failure when sending duplicate settle " +
"with no pending circuit")
}
}
func TestSwitchForwardDropAfterFullAdd(t *testing.T) {
t.Parallel()
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
alicePeer, err := newMockServer(t, "alice", testStartingHeight, nil, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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 := fastsha256.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.forward(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, it should be returned to alice since the
// switch will detect that it has been half added previously.
err = s2.forward(ogPacket)
if err != ErrDuplicateAdd {
t.Fatal("unexpected error when reforwarding a "+
"failed packet", 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, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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 := fastsha256.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.forward(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.forward(ogPacket)
if err != ErrIncompleteForward {
t.Fatal("unexpected error when reforwarding a "+
"failed packet", err)
}
// After detecting an incomplete forward, the fail packet should have
// been returned to the sender.
select {
case <-aliceChannelLink.packets:
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, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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 := fastsha256.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.forward(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.forward(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")
}
}
// 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, err := newMockServer(t, "alice", testStartingHeight, nil, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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,
)
// 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.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, 6)
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.htlcSatifiesPolicyLocalResult = 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 := 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.
err = s.SendHTLC(aliceChannelLink.ShortChanID(), 0, addMsg, nil)
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, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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 := 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 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.forward(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, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobPeer, err := newMockServer(t, "bob", testStartingHeight, nil, 6)
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 := 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 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.forward(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.forward(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.forward(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, 6)
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 := fastsha256.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)
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,
newMockDeobfuscator())
if err != nil {
errChan <- err
return
}
resultChan, err := s.GetPaymentResult(paymentID)
if err != nil {
errChan <- err
return
}
result := <-resultChan
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.NewFailUnknownPaymentHash(update.Amount)
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 !strings.Contains(err.Error(), lnwire.CodeUnknownPaymentHash.String()) {
t.Fatalf("expected %v got %v", err,
lnwire.CodeUnknownPaymentHash)
}
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)
}
fwdingErr := err.(*ForwardingError)
failureMsg := fwdingErr.FailureMessage
if _, ok := failureMsg.(*lnwire.FailTemporaryChannelFailure); !ok {
t.Fatalf("expected temp chan failure instead got: %v",
fwdingErr.FailureMessage)
}
}
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)
})
}