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Merge pull request #1698 from cfromknecht/switch-fwdpkg-cleanup

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[htlcswitch] fwdpkg cleanup
This commit is contained in:
Olaoluwa Osuntokun 2018-08-21 18:56:15 -07:00 committed by GitHub
commit f028eaa152
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 589 additions and 41 deletions
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33
channeldb/channel.go
View File

@ -1597,6 +1597,31 @@ func (c *OpenChannel) LoadFwdPkgs() ([]*FwdPkg, error) {
return fwdPkgs, nil
}
// AckAddHtlcs updates the AckAddFilter containing any of the provided AddRefs
// indicating that a response to this Add has been committed to the remote party.
// Doing so will prevent these Add HTLCs from being reforwarded internally.
func (c *OpenChannel) AckAddHtlcs(addRefs ...AddRef) error {
c.Lock()
defer c.Unlock()
return c.Db.Update(func(tx *bolt.Tx) error {
return c.Packager.AckAddHtlcs(tx, addRefs...)
})
}
// AckSettleFails updates the SettleFailFilter containing any of the provided
// SettleFailRefs, indicating that the response has been delivered to the
// incoming link, corresponding to a particular AddRef. Doing so will prevent
// the responses from being retransmitted internally.
func (c *OpenChannel) AckSettleFails(settleFailRefs ...SettleFailRef) error {
c.Lock()
defer c.Unlock()
return c.Db.Update(func(tx *bolt.Tx) error {
return c.Packager.AckSettleFails(tx, settleFailRefs...)
})
}
// SetFwdFilter atomically sets the forwarding filter for the forwarding package
// identified by `height`.
func (c *OpenChannel) SetFwdFilter(height uint64, fwdFilter *PkgFilter) error {
@ -2415,12 +2440,20 @@ func deleteOpenChannel(chanBucket *bolt.Bucket, chanPointBytes []byte) error {
}
// makeLogKey converts a uint64 into an 8 byte array.
func makeLogKey(updateNum uint64) [8]byte {
var key [8]byte
byteOrder.PutUint64(key[:], updateNum)
return key
}
// readLogKey parse the first 8- bytes of a byte slice into a uint64.
//
// NOTE: The slice must be at least 8 bytes long.
func readLogKey(b []byte) uint64 {
return byteOrder.Uint64(b)
}
func appendChannelLogEntry(log *bolt.Bucket,
commit *ChannelCommitment) error {

16
channeldb/forwarding_package.go
View File

@ -3,11 +3,11 @@ package channeldb
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"io"
"github.com/coreos/bbolt"
"github.com/go-errors/errors"
"github.com/lightningnetwork/lnd/lnwire"
)
@ -759,7 +759,11 @@ func ackAddHtlcsAtHeight(sourceBkt *bolt.Bucket, height uint64,
heightKey := makeLogKey(height)
heightBkt := sourceBkt.Bucket(heightKey[:])
if heightBkt == nil {
return ErrCorruptedFwdPkg
// If the height bucket isn't found, this could be because the
// forwarding package was already removed. We'll return nil to
// signal that the operation is successful, as there is nothing
// to ack.
return nil
}
// Load ack filter from disk.
@ -830,6 +834,11 @@ func ackSettleFails(tx *bolt.Tx, settleFailRefs []SettleFailRef) error {
destKey := makeLogKey(dest.ToUint64())
destBkt := fwdPkgBkt.Bucket(destKey[:])
if destBkt == nil {
// If the destination bucket is not found, this is
// likely the result of the destination channel being
// closed and having it's forwarding packages wiped. We
// won't treat this as an error, because the response
// will no longer be retransmitted internally.
continue
}
@ -852,6 +861,9 @@ func ackSettleFailsAtHeight(destBkt *bolt.Bucket, height uint64,
heightKey := makeLogKey(height)
heightBkt := destBkt.Bucket(heightKey[:])
if heightBkt == nil {
// If the height bucket isn't found, this could be because the
// forwarding package was already removed. We'll return nil to
// signal that the operation is as there is nothing to ack.
return nil
}

122
htlcswitch/link.go
View File

@ -1043,6 +1043,7 @@ func (l *channelLink) handleDownStreamPkt(pkt *htlcPacket, isReProcess bool) {
// mailbox, and the HTLC being added to the commitment state.
if l.cfg.DebugHTLC && l.cfg.HodlMask.Active(hodl.AddOutgoing) {
l.warnf(hodl.AddOutgoing.Warning())
l.mailBox.AckPacket(pkt.inKey())
return
}
@ -1097,6 +1098,7 @@ func (l *channelLink) handleDownStreamPkt(pkt *htlcPacket, isReProcess bool) {
err := lnwire.EncodeFailure(&b, failure, 0)
if err != nil {
l.errorf("unable to encode failure: %v", err)
l.mailBox.AckPacket(pkt.inKey())
return
}
reason = lnwire.OpaqueReason(b.Bytes())
@ -1106,6 +1108,7 @@ func (l *channelLink) handleDownStreamPkt(pkt *htlcPacket, isReProcess bool) {
reason, err = pkt.obfuscator.EncryptFirstHop(failure)
if err != nil {
l.errorf("unable to obfuscate error: %v", err)
l.mailBox.AckPacket(pkt.inKey())
return
}
}
@ -1162,22 +1165,38 @@ func (l *channelLink) handleDownStreamPkt(pkt *htlcPacket, isReProcess bool) {
// commitment state.
if l.cfg.DebugHTLC && l.cfg.HodlMask.Active(hodl.SettleOutgoing) {
l.warnf(hodl.SettleOutgoing.Warning())
l.mailBox.AckPacket(pkt.inKey())
return
}
// An HTLC we forward to the switch has just settled somewhere
// upstream. Therefore we settle the HTLC within the our local
// state machine.
closedCircuitRef := pkt.inKey()
if err := l.channel.SettleHTLC(
inKey := pkt.inKey()
err := l.channel.SettleHTLC(
htlc.PaymentPreimage,
pkt.incomingHTLCID,
pkt.sourceRef,
pkt.destRef,
&closedCircuitRef,
); err != nil {
l.fail(LinkFailureError{code: ErrInternalError},
"unable to settle incoming HTLC: %v", err)
&inKey,
)
if err != nil {
l.errorf("unable to settle incoming HTLC for "+
"circuit-key=%v: %v", inKey, err)
// If the HTLC index for Settle response was not known
// to our commitment state, it has already been
// cleaned up by a prior response. We'll thus try to
// clean up any lingering state to ensure we don't
// continue reforwarding.
if _, ok := err.(lnwallet.ErrUnknownHtlcIndex); ok {
l.cleanupSpuriousResponse(pkt)
}
// Remove the packet from the link's mailbox to ensure
// it doesn't get replayed after a reconnection.
l.mailBox.AckPacket(inKey)
return
}
@ -1204,20 +1223,37 @@ func (l *channelLink) handleDownStreamPkt(pkt *htlcPacket, isReProcess bool) {
// state.
if l.cfg.DebugHTLC && l.cfg.HodlMask.Active(hodl.FailOutgoing) {
l.warnf(hodl.FailOutgoing.Warning())
l.mailBox.AckPacket(pkt.inKey())
return
}
// An HTLC cancellation has been triggered somewhere upstream,
// we'll remove then HTLC from our local state machine.
closedCircuitRef := pkt.inKey()
if err := l.channel.FailHTLC(
inKey := pkt.inKey()
err := l.channel.FailHTLC(
pkt.incomingHTLCID,
htlc.Reason,
pkt.sourceRef,
pkt.destRef,
&closedCircuitRef,
); err != nil {
log.Errorf("unable to cancel HTLC: %v", err)
&inKey,
)
if err != nil {
l.errorf("unable to cancel incoming HTLC for "+
"circuit-key=%v: %v", inKey, err)
// If the HTLC index for Fail response was not known to
// our commitment state, it has already been cleaned up
// by a prior response. We'll thus try to clean up any
// lingering state to ensure we don't continue
// reforwarding.
if _, ok := err.(lnwallet.ErrUnknownHtlcIndex); ok {
l.cleanupSpuriousResponse(pkt)
}
// Remove the packet from the link's mailbox to ensure
// it doesn't get replayed after a reconnection.
l.mailBox.AckPacket(inKey)
return
}
@ -1252,6 +1288,70 @@ func (l *channelLink) handleDownStreamPkt(pkt *htlcPacket, isReProcess bool) {
}
}
// cleanupSpuriousResponse attempts to ack any AddRef or SettleFailRef
// associated with this packet. If successful in doing so, it will also purge
// the open circuit from the circuit map and remove the packet from the link's
// mailbox.
func (l *channelLink) cleanupSpuriousResponse(pkt *htlcPacket) {
inKey := pkt.inKey()
l.debugf("Cleaning up spurious response for incoming circuit-key=%v",
inKey)
// If the htlc packet doesn't have a source reference, it is unsafe to
// proceed, as skipping this ack may cause the htlc to be reforwarded.
if pkt.sourceRef == nil {
l.errorf("uanble to cleanup response for incoming "+
"circuit-key=%v, does not contain source reference",
inKey)
return
}
// If the source reference is present, we will try to prevent this link
// from resending the packet to the switch. To do so, we ack the AddRef
// of the incoming HTLC belonging to this link.
err := l.channel.AckAddHtlcs(*pkt.sourceRef)
if err != nil {
l.errorf("unable to ack AddRef for incoming "+
"circuit-key=%v: %v", inKey, err)
// If this operation failed, it is unsafe to attempt removal of
// the destination reference or circuit, so we exit early. The
// cleanup may proceed with a different packet in the future
// that succeeds on this step.
return
}
// Now that we know this link will stop retransmitting Adds to the
// switch, we can begin to teardown the response reference and circuit
// map.
//
// If the packet includes a destination reference, then a response for
// this HTLC was locked into the outgoing channel. Attempt to remove
// this reference, so we stop retransmitting the response internally.
// Even if this fails, we will proceed in trying to delete the circuit.
// When retransmitting responses, the destination references will be
// cleaned up if an open circuit is not found in the circuit map.
if pkt.destRef != nil {
err := l.channel.AckSettleFails(*pkt.destRef)
if err != nil {
l.errorf("unable to ack SettleFailRef "+
"for incoming circuit-key=%v: %v",
inKey, err)
}
}
l.debugf("Deleting circuit for incoming circuit-key=%x", inKey)
// With all known references acked, we can now safely delete the circuit
// from the switch's circuit map, as the state is no longer needed.
err = l.cfg.Circuits.DeleteCircuits(inKey)
if err != nil {
l.errorf("unable to delete circuit for "+
"circuit-key=%v: %v", inKey, err)
}
}
// handleUpstreamMsg processes wire messages related to commitment state
// updates from the upstream peer. The upstream peer is the peer whom we have a
// direct channel with, updating our respective commitment chains.

333
htlcswitch/link_test.go
View File

@ -1465,6 +1465,7 @@ func (m *mockPeer) SendMessage(sync bool, msgs ...lnwire.Message) error {
if m.disconnected {
return fmt.Errorf("disconnected")
}
select {
case m.sentMsgs <- msgs[0]:
case <-m.quit:
@ -4195,6 +4196,9 @@ func receiveRevAndAckAliceToBob(t *testing.T, aliceMsgs chan lnwire.Message,
func receiveCommitSigAliceToBob(t *testing.T, aliceMsgs chan lnwire.Message,
aliceLink ChannelLink, bobChannel *lnwallet.LightningChannel,
expHtlcs int) {
t.Helper()
var msg lnwire.Message
select {
case msg = <-aliceMsgs:
@ -4234,6 +4238,9 @@ func sendRevAndAckBobToAlice(t *testing.T, aliceLink ChannelLink,
// Bob, then hands this to Bob.
func receiveSettleAliceToBob(t *testing.T, aliceMsgs chan lnwire.Message,
aliceLink ChannelLink, bobChannel *lnwallet.LightningChannel) {
t.Helper()
var msg lnwire.Message
select {
case msg = <-aliceMsgs:
@ -4253,6 +4260,31 @@ func receiveSettleAliceToBob(t *testing.T, aliceMsgs chan lnwire.Message,
}
}
// receiveSettleAliceToBob waits for Alice to send a HTLC settle message to
// Bob, then hands this to Bob.
func receiveFailAliceToBob(t *testing.T, aliceMsgs chan lnwire.Message,
aliceLink ChannelLink, bobChannel *lnwallet.LightningChannel) {
t.Helper()
var msg lnwire.Message
select {
case msg = <-aliceMsgs:
case <-time.After(15 * time.Second):
t.Fatalf("did not receive message")
}
failMsg, ok := msg.(*lnwire.UpdateFailHTLC)
if !ok {
t.Fatalf("expected UpdateFailHTLC, got %T", msg)
}
err := bobChannel.ReceiveFailHTLC(failMsg.ID, failMsg.Reason)
if err != nil {
t.Fatalf("unable to apply received fail htlc: %v", err)
}
}
// TestChannelLinkNoMoreUpdates tests that we won't send a new commitment
// when there are no new updates to sign.
func TestChannelLinkNoMoreUpdates(t *testing.T) {
@ -4455,6 +4487,307 @@ func TestChannelLinkWaitForRevocation(t *testing.T) {
}
}
// TestChannelLinkCleanupSpuriousResponses tests that we properly cleanup
// references in the event that internal retransmission continues as a result of
// not properly cleaning up Add/SettleFailRefs.
func TestChannelLinkCleanupSpuriousResponses(t *testing.T) {
t.Parallel()
const chanAmt = btcutil.SatoshiPerBitcoin * 5
const chanReserve = btcutil.SatoshiPerBitcoin * 1
aliceLink, bobChannel, _, start, cleanUp, _, err :=
newSingleLinkTestHarness(chanAmt, chanReserve)
if err != nil {
t.Fatalf("unable to create link: %v", err)
}
defer cleanUp()
if err := start(); err != nil {
t.Fatalf("unable to start test harness: %v", err)
}
var (
coreLink = aliceLink.(*channelLink)
aliceMsgs = coreLink.cfg.Peer.(*mockPeer).sentMsgs
)
// Settle Alice in hodl ExitSettle mode so that she won't respond
// immediately to the htlc's meant for her. This allows us to control
// the responses she gives back to Bob.
coreLink.cfg.DebugHTLC = true
coreLink.cfg.HodlMask = hodl.ExitSettle.Mask()
// Add two HTLCs to Alice's registry, that Bob can pay.
htlc1 := generateHtlc(t, coreLink, bobChannel, 0)
htlc2 := generateHtlc(t, coreLink, bobChannel, 1)
// We start with he following scenario: Bob sends Alice two HTLCs, and a
// commitment dance ensures, leaving two HTLCs that Alice can respond
// to. Since Alice is in ExitSettle mode, we will then take over and
// provide targetted fail messages to test the link's ability to cleanup
// spurious responses.
//
// Bob Alice
// |------ add-1 ----->|
// |------ add-2 ----->|
// |------ sig ----->| commits add-1 + add-2
// |<----- rev ------|
// |<----- sig ------| commits add-1 + add-2
// |------ rev ----->|
sendHtlcBobToAlice(t, aliceLink, bobChannel, htlc1)
sendHtlcBobToAlice(t, aliceLink, bobChannel, htlc2)
sendCommitSigBobToAlice(t, aliceLink, bobChannel, 2)
receiveRevAndAckAliceToBob(t, aliceMsgs, aliceLink, bobChannel)
receiveCommitSigAliceToBob(t, aliceMsgs, aliceLink, bobChannel, 2)
sendRevAndAckBobToAlice(t, aliceLink, bobChannel)
// Give Alice to time to process the revocation.
time.Sleep(time.Second)
aliceFwdPkgs, err := coreLink.channel.LoadFwdPkgs()
if err != nil {
t.Fatalf("unable to load alice's fwdpkgs: %v", err)
}
// Alice should have exactly one forwarding package.
if len(aliceFwdPkgs) != 1 {
t.Fatalf("alice should have 1 fwd pkgs, has %d instead",
len(aliceFwdPkgs))
}
// We'll stash the height of these AddRefs, so that we can reconstruct
// the proper references later.
addHeight := aliceFwdPkgs[0].Height
// The first fwdpkg should have exactly 2 entries, one for each Add that
// was added during the last dance.
if aliceFwdPkgs[0].AckFilter.Count() != 2 {
t.Fatalf("alice fwdpkg should have 2 Adds, has %d instead",
aliceFwdPkgs[0].AckFilter.Count())
}
// Both of the entries in the FwdFilter should be unacked.
for i := 0; i < 2; i++ {
if aliceFwdPkgs[0].AckFilter.Contains(uint16(i)) {
t.Fatalf("alice fwdpkg index %d should not "+
"have ack", i)
}
}
// Now, construct a Fail packet for Bob settling the first HTLC. This
// packet will NOT include a sourceRef, meaning the AddRef on disk will
// not be acked after committing this response.
fail0 := &htlcPacket{
incomingChanID: bobChannel.ShortChanID(),
incomingHTLCID: 0,
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateFailHTLC{},
}
aliceLink.HandleSwitchPacket(fail0)
// Bob Alice
// |<----- fal-1 ------|
// |<----- sig ------| commits fal-1
receiveFailAliceToBob(t, aliceMsgs, aliceLink, bobChannel)
receiveCommitSigAliceToBob(t, aliceMsgs, aliceLink, bobChannel, 1)
aliceFwdPkgs, err = coreLink.channel.LoadFwdPkgs()
if err != nil {
t.Fatalf("unable to load alice's fwdpkgs: %v", err)
}
// Alice should still only have one fwdpkg, as she hasn't yet received
// another revocation from Bob.
if len(aliceFwdPkgs) != 1 {
t.Fatalf("alice should have 1 fwd pkgs, has %d instead",
len(aliceFwdPkgs))
}
// Assert the fwdpkg still has 2 entries for the original Adds.
if aliceFwdPkgs[0].AckFilter.Count() != 2 {
t.Fatalf("alice fwdpkg should have 2 Adds, has %d instead",
aliceFwdPkgs[0].AckFilter.Count())
}
// Since the fail packet was missing the AddRef, the forward filter for
// either HTLC should not have been modified.
for i := 0; i < 2; i++ {
if aliceFwdPkgs[0].AckFilter.Contains(uint16(i)) {
t.Fatalf("alice fwdpkg index %d should not "+
"have ack", i)
}
}
// Complete the rest of the commitment dance, now that the forwarding
// packages have been verified.
//
// Bob Alice
// |------ rev ----->|
// |------ sig ----->|
// |<----- rev ------|
sendRevAndAckBobToAlice(t, aliceLink, bobChannel)
sendCommitSigBobToAlice(t, aliceLink, bobChannel, 1)
receiveRevAndAckAliceToBob(t, aliceMsgs, aliceLink, bobChannel)
// Next, we'll construct a fail packet for add-2 (index 1), which we'll
// send to Bob and lock in. Since the AddRef is set on this instance, we
// should see the second HTLCs AddRef update the forward filter for the
// first fwd pkg.
fail1 := &htlcPacket{
sourceRef: &channeldb.AddRef{
Height: addHeight,
Index: 1,
},
incomingChanID: bobChannel.ShortChanID(),
incomingHTLCID: 1,
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateFailHTLC{},
}
aliceLink.HandleSwitchPacket(fail1)
// Bob Alice
// |<----- fal-1 ------|
// |<----- sig ------| commits fal-1
receiveFailAliceToBob(t, aliceMsgs, aliceLink, bobChannel)
receiveCommitSigAliceToBob(t, aliceMsgs, aliceLink, bobChannel, 0)
aliceFwdPkgs, err = coreLink.channel.LoadFwdPkgs()
if err != nil {
t.Fatalf("unable to load alice's fwdpkgs: %v", err)
}
// Now that another commitment dance has completed, Alice should have 2
// forwarding packages.
if len(aliceFwdPkgs) != 2 {
t.Fatalf("alice should have 2 fwd pkgs, has %d instead",
len(aliceFwdPkgs))
}
// The most recent package should have no new HTLCs, so it should be
// empty.
if aliceFwdPkgs[1].AckFilter.Count() != 0 {
t.Fatalf("alice fwdpkg height=%d should have 0 Adds, "+
"has %d instead", aliceFwdPkgs[1].Height,
aliceFwdPkgs[1].AckFilter.Count())
}
// The index for the first AddRef should still be unacked, as the
// sourceRef was missing on the htlcPacket.
if aliceFwdPkgs[0].AckFilter.Contains(0) {
t.Fatalf("alice fwdpkg height=%d index=0 should not "+
"have an ack", aliceFwdPkgs[0].Height)
}
// The index for the second AddRef should now be acked, as it was
// properly constructed and committed in Alice's last commit sig.
if !aliceFwdPkgs[0].AckFilter.Contains(1) {
t.Fatalf("alice fwdpkg height=%d index=1 should have "+
"an ack", aliceFwdPkgs[0].Height)
}
// Complete the rest of the commitment dance.
//
// Bob Alice
// |------ rev ----->|
// |------ sig ----->|
// |<----- rev ------|
sendRevAndAckBobToAlice(t, aliceLink, bobChannel)
sendCommitSigBobToAlice(t, aliceLink, bobChannel, 0)
receiveRevAndAckAliceToBob(t, aliceMsgs, aliceLink, bobChannel)
// We'll do a quick sanity check, and blindly send the same fail packet
// for the first HTLC. Since this HTLC index has already been settled,
// this should trigger an attempt to cleanup the spurious response.
// However, we expect it to result in a NOP since it is still missing
// its sourceRef.
aliceLink.HandleSwitchPacket(fail0)
// Allow the link enough time to process and reject the duplicate
// packet, we'll also check that this doesn't trigger Alice to send the
// fail to Bob.
select {
case <-aliceMsgs:
t.Fatalf("message sent for duplicate fail")
case <-time.After(time.Second):
}
aliceFwdPkgs, err = coreLink.channel.LoadFwdPkgs()
if err != nil {
t.Fatalf("unable to load alice's fwdpkgs: %v", err)
}
// Alice should now have 3 forwarding packages, and the latest should be
// empty.
if len(aliceFwdPkgs) != 3 {
t.Fatalf("alice should have 3 fwd pkgs, has %d instead",
len(aliceFwdPkgs))
}
if aliceFwdPkgs[2].AckFilter.Count() != 0 {
t.Fatalf("alice fwdpkg height=%d should have 0 Adds, "+
"has %d instead", aliceFwdPkgs[2].Height,
aliceFwdPkgs[2].AckFilter.Count())
}
// The state of the forwarding packages should be unmodified from the
// prior assertion, since the duplicate Fail for index 0 should have
// been ignored.
if aliceFwdPkgs[0].AckFilter.Contains(0) {
t.Fatalf("alice fwdpkg height=%d index=0 should not "+
"have an ack", aliceFwdPkgs[0].Height)
}
if !aliceFwdPkgs[0].AckFilter.Contains(1) {
t.Fatalf("alice fwdpkg height=%d index=1 should have "+
"an ack", aliceFwdPkgs[0].Height)
}
// Finally, construct a new Fail packet for the first HTLC, this time
// with the sourceRef properly constructed. When the link handles this
// duplicate, it should clean up the remaining AddRef state maintained
// in Alice's link, but it should not result in anything being sent to
// Bob.
fail0 = &htlcPacket{
sourceRef: &channeldb.AddRef{
Height: addHeight,
Index: 0,
},
incomingChanID: bobChannel.ShortChanID(),
incomingHTLCID: 0,
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateFailHTLC{},
}
aliceLink.HandleSwitchPacket(fail0)
// Allow the link enough time to process and reject the duplicate
// packet, we'll also check that this doesn't trigger Alice to send the
// fail to Bob.
select {
case <-aliceMsgs:
t.Fatalf("message sent for duplicate fail")
case <-time.After(time.Second):
}
aliceFwdPkgs, err = coreLink.channel.LoadFwdPkgs()
if err != nil {
t.Fatalf("unable to load alice's fwdpkgs: %v", err)
}
// Since no state transitions have been performed for the duplicate
// packets, Alice should still have the same 3 forwarding packages.
if len(aliceFwdPkgs) != 3 {
t.Fatalf("alice should have 3 fwd pkgs, has %d instead",
len(aliceFwdPkgs))
}
// Assert that all indices in our original forwarded have now been acked
// as a result of our spurious cleanup logic.
for i := 0; i < 2; i++ {
if !aliceFwdPkgs[0].AckFilter.Contains(uint16(i)) {
t.Fatalf("alice fwdpkg height=%d index=%d "+
"should have ack", aliceFwdPkgs[0].Height, i)
}
}
}
type mockPackager struct {
failLoadFwdPkgs bool
}

26
htlcswitch/switch.go
View File

@ -1636,15 +1636,35 @@ func (s *Switch) Start() error {
// forwarding packages and reforwards any Settle or Fail HTLCs found. This is
// used to resurrect the switch's mailboxes after a restart.
func (s *Switch) reforwardResponses() error {
activeChannels, err := s.cfg.DB.FetchAllOpenChannels()
openChannels, err := s.cfg.DB.FetchAllOpenChannels()
if err != nil {
return err
}
for _, activeChannel := range activeChannels {
shortChanID := activeChannel.ShortChanID()
for _, openChannel := range openChannels {
shortChanID := openChannel.ShortChanID()
// Locally-initiated payments never need reforwarding.
if shortChanID == sourceHop {
continue
}
// If the channel is pending, it should have no forwarding
// packages, and nothing to reforward.
if openChannel.IsPending {
continue
}
// Channels in open or waiting-close may still have responses in
// their forwarding packages. We will continue to reattempt
// forwarding on startup until the channel is fully-closed.
//
// Load this channel's forwarding packages, and deliver them to
// the switch.
fwdPkgs, err := s.loadChannelFwdPkgs(shortChanID)
if err != nil {
log.Errorf("unable to load forwarding "+
"packages for %v: %v", shortChanID, err)
return err
}

52
lnwallet/channel.go
View File

@ -4433,6 +4433,22 @@ func (lc *LightningChannel) LoadFwdPkgs() ([]*channeldb.FwdPkg, error) {
return lc.channelState.LoadFwdPkgs()
}
// AckAddHtlcs sets a bit in the FwdFilter of a forwarding package belonging to
// this channel, that corresponds to the given AddRef. This method also succeeds
// if no forwarding package is found.
func (lc *LightningChannel) AckAddHtlcs(addRef channeldb.AddRef) error {
return lc.channelState.AckAddHtlcs(addRef)
}
// AckSettleFails sets a bit in the SettleFailFilter of a forwarding package
// belonging to this channel, that corresponds to the given SettleFailRef. This
// method also succeeds if no forwarding package is found.
func (lc *LightningChannel) AckSettleFails(
settleFailRefs ...channeldb.SettleFailRef) error {
return lc.channelState.AckSettleFails(settleFailRefs...)
}
// SetFwdFilter writes the forwarding decision for a given remote commitment
// height.
func (lc *LightningChannel) SetFwdFilter(height uint64,
@ -4572,21 +4588,18 @@ func (lc *LightningChannel) SettleHTLC(preimage [32]byte,
htlc := lc.remoteUpdateLog.lookupHtlc(htlcIndex)
if htlc == nil {
return fmt.Errorf("No HTLC with ID %d in channel %v", htlcIndex,
lc.ShortChanID())
return ErrUnknownHtlcIndex{lc.ShortChanID(), htlcIndex}
}
// Now that we know the HTLC exists, before checking to see if the
// preimage matches, we'll ensure that we haven't already attempted to
// modify the HTLC.
if lc.remoteUpdateLog.htlcHasModification(htlcIndex) {
return fmt.Errorf("HTLC with ID %d has already been settled",
htlcIndex)
return ErrHtlcIndexAlreadySettled(htlcIndex)
}
if htlc.RHash != sha256.Sum256(preimage[:]) {
return fmt.Errorf("Invalid payment preimage %x for hash %x",
preimage[:], htlc.RHash[:])
return ErrInvalidSettlePreimage{preimage[:], htlc.RHash[:]}
}
pd := &PaymentDescriptor{
@ -4620,21 +4633,18 @@ func (lc *LightningChannel) ReceiveHTLCSettle(preimage [32]byte, htlcIndex uint6
htlc := lc.localUpdateLog.lookupHtlc(htlcIndex)
if htlc == nil {
return fmt.Errorf("No HTLC with ID %d in channel %v", htlcIndex,
lc.ShortChanID())
return ErrUnknownHtlcIndex{lc.ShortChanID(), htlcIndex}
}
// Now that we know the HTLC exists, before checking to see if the
// preimage matches, we'll ensure that they haven't already attempted
// to modify the HTLC.
if lc.localUpdateLog.htlcHasModification(htlcIndex) {
return fmt.Errorf("HTLC with ID %d has already been settled",
htlcIndex)
return ErrHtlcIndexAlreadySettled(htlcIndex)
}
if htlc.RHash != sha256.Sum256(preimage[:]) {
return fmt.Errorf("Invalid payment preimage %x for hash %x",
preimage[:], htlc.RHash[:])
return ErrInvalidSettlePreimage{preimage[:], htlc.RHash[:]}
}
pd := &PaymentDescriptor{
@ -4688,15 +4698,13 @@ func (lc *LightningChannel) FailHTLC(htlcIndex uint64, reason []byte,
htlc := lc.remoteUpdateLog.lookupHtlc(htlcIndex)
if htlc == nil {
return fmt.Errorf("No HTLC with ID %d in channel %v", htlcIndex,
lc.ShortChanID())
return ErrUnknownHtlcIndex{lc.ShortChanID(), htlcIndex}
}
// Now that we know the HTLC exists, we'll ensure that we haven't
// already attempted to fail the HTLC.
if lc.remoteUpdateLog.htlcHasModification(htlcIndex) {
return fmt.Errorf("HTLC with ID %d has already been failed",
htlcIndex)
return ErrHtlcIndexAlreadyFailed(htlcIndex)
}
pd := &PaymentDescriptor{
@ -4740,15 +4748,13 @@ func (lc *LightningChannel) MalformedFailHTLC(htlcIndex uint64,
htlc := lc.remoteUpdateLog.lookupHtlc(htlcIndex)
if htlc == nil {
return fmt.Errorf("No HTLC with ID %d in channel %v", htlcIndex,
lc.ShortChanID())
return ErrUnknownHtlcIndex{lc.ShortChanID(), htlcIndex}
}
// Now that we know the HTLC exists, we'll ensure that we haven't
// already attempted to fail the HTLC.
if lc.remoteUpdateLog.htlcHasModification(htlcIndex) {
return fmt.Errorf("HTLC with ID %d has already been failed",
htlcIndex)
return ErrHtlcIndexAlreadyFailed(htlcIndex)
}
pd := &PaymentDescriptor{
@ -4785,15 +4791,13 @@ func (lc *LightningChannel) ReceiveFailHTLC(htlcIndex uint64, reason []byte,
htlc := lc.localUpdateLog.lookupHtlc(htlcIndex)
if htlc == nil {
return fmt.Errorf("No HTLC with ID %d in channel %v", htlcIndex,
lc.ShortChanID())
return ErrUnknownHtlcIndex{lc.ShortChanID(), htlcIndex}
}
// Now that we know the HTLC exists, we'll ensure that they haven't
// already attempted to fail the HTLC.
if lc.localUpdateLog.htlcHasModification(htlcIndex) {
return fmt.Errorf("HTLC with ID %d has already been failed",
htlcIndex)
return ErrHtlcIndexAlreadyFailed(htlcIndex)
}
pd := &PaymentDescriptor{

46
lnwallet/errors.go
View File

@ -125,3 +125,49 @@ func ErrChanTooSmall(chanSize, minChanSize btcutil.Amount) ReservationError {
chanSize, minChanSize),
}
}
// ErrHtlcIndexAlreadyFailed is returned when the HTLC index has already been
// failed, but has not been committed by our commitment state.
type ErrHtlcIndexAlreadyFailed uint64
// Error returns a message indicating the index that had already been failed.
func (e ErrHtlcIndexAlreadyFailed) Error() string {
return fmt.Sprintf("HTLC with ID %d has already been failed", e)
}
// ErrHtlcIndexAlreadySettled is returned when the HTLC index has already been
// settled, but has not been committed by our commitment state.
type ErrHtlcIndexAlreadySettled uint64
// Error returns a message indicating the index that had already been settled.
func (e ErrHtlcIndexAlreadySettled) Error() string {
return fmt.Sprintf("HTLC with ID %d has already been settled", e)
}
// ErrInvalidSettlePreimage is returned when trying to settle an HTLC, but the
// preimage does not correspond to the payment hash.
type ErrInvalidSettlePreimage struct {
preimage []byte
rhash []byte
}
// Error returns an error message with the offending preimage and intended
// payment hash.
func (e ErrInvalidSettlePreimage) Error() string {
return fmt.Sprintf("Invalid payment preimage %x for hash %x",
e.preimage, e.rhash)
}
// ErrUnknownHtlcIndex is returned when locally settling or failing an HTLC, but
// the HTLC index is not known to the channel. This typically indicates that the
// HTLC was already settled in a prior commitment.
type ErrUnknownHtlcIndex struct {
chanID lnwire.ShortChannelID
index uint64
}
// Error returns an error logging the channel and HTLC index that was unknown.
func (e ErrUnknownHtlcIndex) Error() string {
return fmt.Sprintf("No HTLC with ID %d in channel %v",
e.index, e.chanID)
}