From 752fc86c7d09490fbb2fa163ee29c47ed6a5eab7 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 30 Jan 2024 17:58:10 -0800 Subject: [PATCH 01/48] lnwire: add feature bits for new rbf coop close --- lnwire/features.go | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/lnwire/features.go b/lnwire/features.go index 73a1684ed..31e750055 100644 --- a/lnwire/features.go +++ b/lnwire/features.go @@ -233,6 +233,22 @@ const ( // able and willing to accept keysend payments. KeysendOptional = 55 + // RbfCoopCloseRequired is a required feature bit that signals that + // the new RBF-based co-op close protocol is supported. + RbfCoopCloseRequired = 60 + + // RbfCoopCloseOptional is an optional feature bit that signals that the + // new RBF-based co-op close protocol is supported. + RbfCoopCloseOptional = 61 + + // RbfCoopCloseRequiredStaging is a required feature bit that signals + // that the new RBF-based co-op close protocol is supported. + RbfCoopCloseRequiredStaging = 160 + + // RbfCoopCloseOptionalStaging is an optional feature bit that signals + // that the new RBF-based co-op close protocol is supported. + RbfCoopCloseOptionalStaging = 161 + // ScriptEnforcedLeaseRequired is a required feature bit that signals // that the node requires channels having zero-fee second-level HTLC // transactions, which also imply anchor commitments, along with an @@ -373,6 +389,10 @@ var Features = map[FeatureBit]string{ ExperimentalEndorsementOptional: "endorsement-x", Bolt11BlindedPathsOptional: "bolt-11-blinded-paths", Bolt11BlindedPathsRequired: "bolt-11-blinded-paths", + RbfCoopCloseOptional: "rbf-coop-close", + RbfCoopCloseRequired: "rbf-coop-close", + RbfCoopCloseOptionalStaging: "rbf-coop-close-x", + RbfCoopCloseRequiredStaging: "rbf-coop-close-x", } // RawFeatureVector represents a set of feature bits as defined in BOLT-09. A From 82ac5fa9120fa54285e46dba30c83df89894c05f Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 30 Jan 2024 17:58:43 -0800 Subject: [PATCH 02/48] feature: set optional bit for rbf-coop close by default --- feature/default_sets.go | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/feature/default_sets.go b/feature/default_sets.go index 9aee982ca..244466e86 100644 --- a/feature/default_sets.go +++ b/feature/default_sets.go @@ -103,4 +103,8 @@ var defaultSetDesc = setDesc{ lnwire.ExperimentalEndorsementOptional: { SetNodeAnn: {}, // N }, + lnwire.RbfCoopCloseOptionalStaging: { + SetInit: {}, // I + SetNodeAnn: {}, // N + }, } From 01382f4c2ac3b3dedea5c89f166632d0c9c6fe68 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 31 Jan 2024 19:09:29 -0800 Subject: [PATCH 03/48] htlcswitch: change LinkDirection to be a type alias In this commit, we change LinkDirection to be a type alias. This makes creating wrapper structs/interfaces easier, as we don't need to leak htlcswitch.LinkDirection, instead we can accept a bool. --- htlcswitch/interfaces.go | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/htlcswitch/interfaces.go b/htlcswitch/interfaces.go index a39eef6a4..30a336085 100644 --- a/htlcswitch/interfaces.go +++ b/htlcswitch/interfaces.go @@ -196,7 +196,7 @@ type FlushHookID uint64 // LinkDirection is used to query and change any link state on a per-direction // basis. -type LinkDirection bool +type LinkDirection = bool const ( // Incoming is the direction from the remote peer to our node. From 1d2c22d1401e891d3b001bc2b9f29fb74a02013a Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Fri, 7 Feb 2025 18:17:27 -0800 Subject: [PATCH 04/48] protofsm: add String() method to ProtocolState --- lnwallet/chancloser/rbf_coop_states.go | 53 ++++++++++++++++++++++++++ protofsm/state_machine.go | 7 ++-- protofsm/state_machine_test.go | 8 ++++ 3 files changed, 65 insertions(+), 3 deletions(-) diff --git a/lnwallet/chancloser/rbf_coop_states.go b/lnwallet/chancloser/rbf_coop_states.go index d5c207066..b6728629b 100644 --- a/lnwallet/chancloser/rbf_coop_states.go +++ b/lnwallet/chancloser/rbf_coop_states.go @@ -361,6 +361,9 @@ type ProtocolState interface { // ProcessEvent takes a protocol event, and implements a state // transition for the state. ProcessEvent(ProtocolEvent, *Environment) (*CloseStateTransition, error) + + // String returns the name of the state. + String() string } // AsymmetricPeerState is an extension of the normal ProtocolState interface @@ -401,6 +404,11 @@ type ProtocolStates interface { type ChannelActive struct { } +// String returns the name of the state for ChannelActive. +func (c *ChannelActive) String() string { + return "ChannelActive" +} + // IsTerminal returns true if the target state is a terminal state. func (c *ChannelActive) IsTerminal() bool { return false @@ -443,6 +451,11 @@ type ShutdownPending struct { IdealFeeRate fn.Option[chainfee.SatPerVByte] } +// String returns the name of the state for ShutdownPending. +func (s *ShutdownPending) String() string { + return "ShutdownPending" +} + // IsTerminal returns true if the target state is a terminal state. func (s *ShutdownPending) IsTerminal() bool { return false @@ -478,6 +491,11 @@ type ChannelFlushing struct { IdealFeeRate fn.Option[chainfee.SatPerVByte] } +// String returns the name of the state for ChannelFlushing. +func (c *ChannelFlushing) String() string { + return "ChannelFlushing" +} + // protocolStateSealed indicates that this struct is a ProtocolEvent instance. func (c *ChannelFlushing) protocolStateSealed() {} @@ -507,6 +525,15 @@ type ClosingNegotiation struct { PeerState lntypes.Dual[AsymmetricPeerState] } +// String returns the name of the state for ClosingNegotiation. +func (c *ClosingNegotiation) String() string { + localState := c.PeerState.GetForParty(lntypes.Local) + remoteState := c.PeerState.GetForParty(lntypes.Remote) + + return fmt.Sprintf("ClosingNegotiation(local=%v, remote=%v)", + localState, remoteState) +} + // IsTerminal returns true if the target state is a terminal state. func (c *ClosingNegotiation) IsTerminal() bool { return false @@ -594,6 +621,12 @@ type LocalCloseStart struct { CloseChannelTerms } +// String returns the name of the state for LocalCloseStart, including proposed +// fee details. +func (l *LocalCloseStart) String() string { + return "LocalCloseStart" +} + // ShouldRouteTo returns true if the target state should process the target // event. func (l *LocalCloseStart) ShouldRouteTo(event ProtocolEvent) bool { @@ -634,6 +667,11 @@ type LocalOfferSent struct { LocalSig lnwire.Sig } +// String returns the name of the state for LocalOfferSent, including proposed. +func (l *LocalOfferSent) String() string { + return fmt.Sprintf("LocalOfferSent(proposed_fee=%v)", l.ProposedFee) +} + // ShouldRouteTo returns true if the target state should process the target // event. func (l *LocalOfferSent) ShouldRouteTo(event ProtocolEvent) bool { @@ -670,6 +708,11 @@ type ClosePending struct { CloseTx *wire.MsgTx } +// String returns the name of the state for ClosePending. +func (c *ClosePending) String() string { + return fmt.Sprintf("ClosePending(txid=%v)", c.CloseTx.TxHash()) +} + // ShouldRouteTo returns true if the target state should process the target // event. func (c *ClosePending) ShouldRouteTo(event ProtocolEvent) bool { @@ -696,6 +739,11 @@ type CloseFin struct { ConfirmedTx *wire.MsgTx } +// String returns the name of the state for CloseFin. +func (c *CloseFin) String() string { + return "CloseFin" +} + // protocolStateSealed indicates that this struct is a ProtocolEvent instance. func (c *CloseFin) protocolStateSealed() {} @@ -714,6 +762,11 @@ type RemoteCloseStart struct { CloseChannelTerms } +// String returns the name of the state for RemoteCloseStart. +func (r *RemoteCloseStart) String() string { + return "RemoteCloseStart" +} + // ShouldRouteTo returns true if the target state should process the target // event. func (l *RemoteCloseStart) ShouldRouteTo(event ProtocolEvent) bool { diff --git a/protofsm/state_machine.go b/protofsm/state_machine.go index d78563e95..408d7004e 100644 --- a/protofsm/state_machine.go +++ b/protofsm/state_machine.go @@ -77,7 +77,8 @@ type State[Event any, Env Environment] interface { // otherwise. IsTerminal() bool - // TODO(roasbeef): also add state serialization? + // String returns a human readable string that represents the state. + String() string } // DaemonAdapters is a set of methods that server as adapters to bridge the @@ -597,8 +598,8 @@ func (s *StateMachine[Event, Env]) applyEvents(ctx context.Context, } s.log.InfoS(ctx, "State transition", - btclog.Fmt("from_state", "%T", currentState), - btclog.Fmt("to_state", "%T", transition.NextState)) + btclog.Fmt("from_state", "%v", currentState), + btclog.Fmt("to_state", "%v", transition.NextState)) // With our events processed, we'll now update our // internal state. diff --git a/protofsm/state_machine_test.go b/protofsm/state_machine_test.go index bda498683..8ac5ec603 100644 --- a/protofsm/state_machine_test.go +++ b/protofsm/state_machine_test.go @@ -51,6 +51,10 @@ type dummyStateStart struct { canSend *atomic.Bool } +func (d *dummyStateStart) String() string { + return "dummyStateStart" +} + var ( hexDecode = func(keyStr string) []byte { keyBytes, _ := hex.DecodeString(keyStr) @@ -134,6 +138,10 @@ func (d *dummyStateStart) IsTerminal() bool { type dummyStateFin struct { } +func (d *dummyStateFin) String() string { + return "dummyStateFin" +} + func (d *dummyStateFin) ProcessEvent(event dummyEvents, env *dummyEnv, ) (*StateTransition[dummyEvents, *dummyEnv], error) { From c32d4f96951e28bde07bd2d59ceadd1d38d2ed62 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 31 Jan 2024 19:25:13 -0800 Subject: [PATCH 05/48] peer: add an implementation of chancloser.ChanObserver In this commit, we add an implementation of a new interface the rbf coop state machine needs. We take care to accept interfaces everywhere, to make this easier to test, and decouple from the concrete types we'll end up using elsewhere. --- peer/chan_observer.go | 176 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 176 insertions(+) create mode 100644 peer/chan_observer.go diff --git a/peer/chan_observer.go b/peer/chan_observer.go new file mode 100644 index 000000000..61dace50d --- /dev/null +++ b/peer/chan_observer.go @@ -0,0 +1,176 @@ +package peer + +import ( + "github.com/btcsuite/btcd/wire" + "github.com/lightningnetwork/lnd/channeldb" + "github.com/lightningnetwork/lnd/fn/v2" + "github.com/lightningnetwork/lnd/htlcswitch" + "github.com/lightningnetwork/lnd/lntypes" + "github.com/lightningnetwork/lnd/lnwallet/chancloser" +) + +// channelView is a view into the current active/global channel state machine +// for a given link. +type channelView interface { + // OweCommitment returns a boolean value reflecting whether we need to + // send out a commitment signature because there are outstanding local + // updates and/or updates in the local commit tx that aren't reflected + // in the remote commit tx yet. + OweCommitment() bool + + // IsChannelClean returns true if neither side has pending commitments, + // neither side has HTLC's, and all updates are locked in irrevocably. + IsChannelClean() bool + + // MarkCoopBroadcasted persistently marks that the channel close + // transaction has been broadcast. + MarkCoopBroadcasted(*wire.MsgTx, lntypes.ChannelParty) error + + // StateSnapshot returns a snapshot of the current fully committed + // state within the channel. + StateSnapshot() *channeldb.ChannelSnapshot + + // MarkShutdownSent persists the given ShutdownInfo. The existence of + // the ShutdownInfo represents the fact that the Shutdown message has + // been sent by us and so should be re-sent on re-establish. + MarkShutdownSent(info *channeldb.ShutdownInfo) error +} + +// linkController is capable of controlling the flow out incoming/outgoing +// HTLCs to/from the link. +type linkController interface { + // DisableAdds sets the ChannelUpdateHandler state to allow/reject + // UpdateAddHtlc's in the specified direction. It returns true if the + // state was changed and false if the desired state was already set + // before the method was called. + DisableAdds(outgoing bool) bool + + // IsFlushing returns true when UpdateAddHtlc's are disabled in the + // direction of the argument. + IsFlushing(direction bool) bool +} + +// linkNetworkController is an interface that represents an object capable of +// managing interactions with the active channel links from the PoV of the +// gossip network. +type linkNetworkController interface { + // RequestDisable disables a channel by its channel point. + RequestDisable(wire.OutPoint, bool) error +} + +// chanObserver implements the chancloser.ChanObserver interface for the +// existing LightningChannel struct/instance. +type chanObserver struct { + chanView channelView + link linkController + linkNetwork linkNetworkController +} + +// newChanObserver creates a new instance of a chanObserver from an active +// channelView. +// +//nolint:unused +func newChanObserver(chanView channelView, + link linkController, linkNetwork linkNetworkController) *chanObserver { + + return &chanObserver{ + chanView: chanView, + link: link, + linkNetwork: linkNetwork, + } +} + +// NoDanglingUpdates returns true if there are no dangling updates in the +// channel. In other words, there are no active update messages that haven't +// already been covered by a commit sig. +func (l *chanObserver) NoDanglingUpdates() bool { + return !l.chanView.OweCommitment() +} + +// DisableIncomingAdds instructs the channel link to disable process new +// incoming add messages. +func (l *chanObserver) DisableIncomingAdds() error { + // If there's no link, then we don't need to disable any adds. + if l.link == nil { + return nil + } + + disabled := l.link.DisableAdds(htlcswitch.Incoming) + if disabled { + chanPoint := l.chanView.StateSnapshot().ChannelPoint + peerLog.Debugf("ChannelPoint(%v): link already disabled", + chanPoint) + } + + return nil +} + +// DisableOutgoingAdds instructs the channel link to disable process new +// outgoing add messages. +func (l *chanObserver) DisableOutgoingAdds() error { + // If there's no link, then we don't need to disable any adds. + if l.link == nil { + return nil + } + + _ = l.link.DisableAdds(htlcswitch.Outgoing) + + return nil +} + +// MarkCoopBroadcasted persistently marks that the channel close transaction +// has been broadcast. +func (l *chanObserver) MarkCoopBroadcasted(tx *wire.MsgTx, local bool) error { + return l.chanView.MarkCoopBroadcasted(tx, lntypes.Local) +} + +// MarkShutdownSent persists the given ShutdownInfo. The existence of the +// ShutdownInfo represents the fact that the Shutdown message has been sent by +// us and so should be re-sent on re-establish. +func (l *chanObserver) MarkShutdownSent(deliveryAddr []byte, + isInitiator bool) error { + + shutdownInfo := channeldb.NewShutdownInfo(deliveryAddr, isInitiator) + return l.chanView.MarkShutdownSent(shutdownInfo) +} + +// FinalBalances is the balances of the channel once it has been flushed. If +// Some, then this indicates that the channel is now in a state where it's +// always flushed, so we can accelerate the state transitions. +func (l *chanObserver) FinalBalances() fn.Option[chancloser.ShutdownBalances] { + chanClean := l.chanView.IsChannelClean() + + switch { + // If we have a link, then the balances are final if both the incoming + // and outgoing adds are disabled _and_ the channel is clean. + case l.link != nil && l.link.IsFlushing(htlcswitch.Incoming) && + l.link.IsFlushing(htlcswitch.Outgoing) && chanClean: + + fallthrough + + // If we don't have a link, then this is a restart case, so the + // balances are final. + case l.link == nil: + snapshot := l.chanView.StateSnapshot() + + return fn.Some(chancloser.ShutdownBalances{ + LocalBalance: snapshot.LocalBalance, + RemoteBalance: snapshot.RemoteBalance, + }) + + // Otherwise, the link is still active and not flushed, so the balances + // aren't yet final. + default: + return fn.None[chancloser.ShutdownBalances]() + } +} + +// DisableChannel disables the target channel. +func (l *chanObserver) DisableChannel() error { + op := l.chanView.StateSnapshot().ChannelPoint + return l.linkNetwork.RequestDisable(op, false) +} + +// A compile-time assertion to ensure that chanObserver meets the +// chancloser.ChanStateObserver interface. +var _ chancloser.ChanStateObserver = (*chanObserver)(nil) From daed552bf129501de9f74a2ed4d272e1a7286e3e Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 31 Jan 2024 19:25:43 -0800 Subject: [PATCH 06/48] peer: make a DaemonAdapter impl for lnd Similar to the last commit, in this commit, we make a daemon adapter impl for lnd. We'll use this for any future protofsm based state machine. --- peer/daemon_adapters.go | 149 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 peer/daemon_adapters.go diff --git a/peer/daemon_adapters.go b/peer/daemon_adapters.go new file mode 100644 index 000000000..606f88b25 --- /dev/null +++ b/peer/daemon_adapters.go @@ -0,0 +1,149 @@ +package peer + +import ( + "fmt" + + "github.com/btcsuite/btcd/btcec/v2" + "github.com/btcsuite/btcd/chaincfg/chainhash" + "github.com/btcsuite/btcd/wire" + "github.com/lightningnetwork/lnd/chainntnfs" + "github.com/lightningnetwork/lnd/lnwire" + "github.com/lightningnetwork/lnd/protofsm" +) + +// MessageSender is an interface that represents an object capable of sending +// p2p messages to a destination. +type MessageSender interface { + // SendMessages sends the target set of messages to the target peer. + // + // TODO(roasbeef): current impl bound to single peer, need server + // pointer otherwise + SendMessages(btcec.PublicKey, []lnwire.Message) error +} + +// flexMessageSender is a message sender-like interface that is aware of +// sync/async semantics, and is bound to a single peer. +// +//nolint:unused +type flexMessageSender interface { + // SendMessage sends a variadic number of high-priority messages to the + // remote peer. The first argument denotes if the method should block + // until the messages have been sent to the remote peer or an error is + // returned, otherwise it returns immediately after queuing. + SendMessage(sync bool, msgs ...lnwire.Message) error +} + +// peerMsgSender implements the MessageSender interface for a single peer. +// It'll return an error if the target public isn't equal to public key of the +// backing peer. +// +//nolint:unused +type peerMsgSender struct { + sender flexMessageSender + peerPub btcec.PublicKey +} + +// newPeerMsgSender creates a new instance of a peerMsgSender. +// +//nolint:unused +func newPeerMsgSender(peerPub btcec.PublicKey, + msgSender flexMessageSender) *peerMsgSender { + + return &peerMsgSender{ + sender: msgSender, + peerPub: peerPub, + } +} + +// SendMessages sends the target set of messages to the target peer. +// +// TODO(roasbeef): current impl bound to single peer, need server pointer +// otherwise? +// +//nolint:unused +func (p *peerMsgSender) SendMessages(pub btcec.PublicKey, + msgs []lnwire.Message) error { + + if !p.peerPub.IsEqual(&pub) { + return fmt.Errorf("wrong peer pubkey: got %x, can only send "+ + "to %x", pub.SerializeCompressed(), + p.peerPub.SerializeCompressed()) + } + + return p.sender.SendMessage(true, msgs...) +} + +// TxBroadcaster is an interface that represents an object capable of +// broadcasting transactions to the network. +type TxBroadcaster interface { + // PublishTransaction broadcasts a transaction to the network. + PublishTransaction(*wire.MsgTx, string) error +} + +// LndAdapterCfg is a struct that holds the configuration for the +// LndDaemonAdapters instance. +type LndAdapterCfg struct { + // MsgSender is capable of sending messages to an arbitrary peer. + MsgSender MessageSender + + // TxBroadcaster is capable of broadcasting a transaction to the + // network. + TxBroadcaster TxBroadcaster + + // ChainNotifier is capable of receiving notifications for on-chain + // events. + ChainNotifier chainntnfs.ChainNotifier +} + +// LndDaemonAdapters is a struct that implements the protofsm.DaemonAdapters +// interface using common lnd abstractions. +type LndDaemonAdapters struct { + cfg LndAdapterCfg +} + +// NewLndDaemonAdapters creates a new instance of the lndDaemonAdapters struct. +func NewLndDaemonAdapters(cfg LndAdapterCfg) *LndDaemonAdapters { + return &LndDaemonAdapters{ + cfg: cfg, + } +} + +// SendMessages sends the target set of messages to the target peer. +func (l *LndDaemonAdapters) SendMessages(pub btcec.PublicKey, + msgs []lnwire.Message) error { + + return l.cfg.MsgSender.SendMessages(pub, msgs) +} + +// BroadcastTransaction broadcasts a transaction with the target label. +func (l *LndDaemonAdapters) BroadcastTransaction(tx *wire.MsgTx, + label string) error { + + return l.cfg.TxBroadcaster.PublishTransaction(tx, label) +} + +// RegisterConfirmationsNtfn registers an intent to be notified once txid +// reaches numConfs confirmations. +func (l *LndDaemonAdapters) RegisterConfirmationsNtfn(txid *chainhash.Hash, + pkScript []byte, numConfs, heightHint uint32, + opts ...chainntnfs.NotifierOption, +) (*chainntnfs.ConfirmationEvent, error) { + + return l.cfg.ChainNotifier.RegisterConfirmationsNtfn( + txid, pkScript, numConfs, heightHint, opts..., + ) +} + +// RegisterSpendNtfn registers an intent to be notified once the target +// outpoint is successfully spent within a transaction. +func (l *LndDaemonAdapters) RegisterSpendNtfn(outpoint *wire.OutPoint, + pkScript []byte, heightHint uint32) (*chainntnfs.SpendEvent, error) { + + return l.cfg.ChainNotifier.RegisterSpendNtfn( + outpoint, pkScript, heightHint, + ) +} + +// A compile time check to ensure that lndDaemonAdapters fully implements the +// DaemonAdapters interface. +var _ protofsm.DaemonAdapters = (*LndDaemonAdapters)(nil) From a4064c70dc00deeed9b3cde1bc4e39b0c1cfa2a8 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:05:49 -0800 Subject: [PATCH 07/48] protofsm: don't return error on broadcast fail We don't return an error on broadcast fail as the broadcast might have failed due to insufficient fees, or inability to be replaced, which may happen when one side attempts to unnecessarily bump their coop close fee. --- protofsm/state_machine.go | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/protofsm/state_machine.go b/protofsm/state_machine.go index 408d7004e..bf61d727c 100644 --- a/protofsm/state_machine.go +++ b/protofsm/state_machine.go @@ -436,7 +436,7 @@ func (s *StateMachine[Event, Env]) executeDaemonEvent(ctx context.Context, daemonEvent.Tx, daemonEvent.Label, ) if err != nil { - return fmt.Errorf("unable to broadcast txn: %w", err) + log.Errorf("unable to broadcast txn: %v", err) } return nil From 29afeb42fb888881e44d64ac5e78f6eb79bd5949 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:15:06 -0800 Subject: [PATCH 08/48] lnd: register protofsm logger --- log.go | 2 ++ 1 file changed, 2 insertions(+) diff --git a/log.go b/log.go index d3c93b432..e4c1d2ebe 100644 --- a/log.go +++ b/log.go @@ -47,6 +47,7 @@ import ( "github.com/lightningnetwork/lnd/netann" "github.com/lightningnetwork/lnd/peer" "github.com/lightningnetwork/lnd/peernotifier" + "github.com/lightningnetwork/lnd/protofsm" "github.com/lightningnetwork/lnd/routing" "github.com/lightningnetwork/lnd/routing/blindedpath" "github.com/lightningnetwork/lnd/routing/localchans" @@ -178,6 +179,7 @@ func SetupLoggers(root *build.SubLoggerManager, interceptor signal.Interceptor) AddSubLogger(root, "PEER", interceptor, peer.UseLogger) AddSubLogger(root, "CHCL", interceptor, chancloser.UseLogger) AddSubLogger(root, "LCHN", interceptor, localchans.UseLogger) + AddSubLogger(root, "PFSM", interceptor, protofsm.UseLogger) AddSubLogger(root, routing.Subsystem, interceptor, routing.UseLogger) AddSubLogger(root, routerrpc.Subsystem, interceptor, routerrpc.UseLogger) From 127d3bed6660b2c103ec3c7fc0b2e49ed3192ee7 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Mon, 10 Feb 2025 18:34:03 -0800 Subject: [PATCH 09/48] input: add new ScriptIsOpReturn helper func --- input/fuzz_script_is_op_return_test.go | 51 ++++++++++++++++++++++++++ input/script_utils.go | 33 +++++++++++++++++ 2 files changed, 84 insertions(+) create mode 100644 input/fuzz_script_is_op_return_test.go diff --git a/input/fuzz_script_is_op_return_test.go b/input/fuzz_script_is_op_return_test.go new file mode 100644 index 000000000..148d7b02e --- /dev/null +++ b/input/fuzz_script_is_op_return_test.go @@ -0,0 +1,51 @@ +package input + +import ( + "testing" + + "github.com/btcsuite/btcd/chaincfg" + "github.com/btcsuite/btcd/txscript" + "github.com/stretchr/testify/require" +) + +// FuzzScriptIsOpReturn fuzzes the ScriptIsOpReturn function. +func FuzzScriptIsOpReturn(f *testing.F) { + // Seed the corpus with some representative inputs. + f.Add([]byte{}) + f.Add([]byte{txscript.OP_RETURN}) + + // Use our canonical ScriptBuilder to produce a valid OP_RETURN script. + builder := txscript.NewScriptBuilder() + builder.AddOp(txscript.OP_RETURN) + builder.AddData([]byte("valid data")) + script, err := builder.Script() + require.NoError(f, err) + f.Add(script) + + // An example of a script that does not start with OP_RETURN. + f.Add([]byte{txscript.OP_DUP, txscript.OP_RETURN}) + + f.Fuzz(func(t *testing.T, pkScript []byte) { + result := ScriptIsOpReturn(pkScript) + + var expected bool + if len(script) == 0 || script[0] != txscript.OP_RETURN { + expected = false + } else { + scriptClass, _, _, err := txscript.ExtractPkScriptAddrs( + pkScript, &chaincfg.MainNetParams, + ) + if err != nil { + t.Fatalf("unable to extract pk script "+ + "addresses: %v", err) + } + + expected = scriptClass == txscript.NullDataTy + } + + if result != expected { + t.Fatalf("for script %x, expected ScriptIsOpReturn=%v;"+ + " got %v", script, expected, result) + } + }) +} diff --git a/input/script_utils.go b/input/script_utils.go index 90e368dd1..0b38fad35 100644 --- a/input/script_utils.go +++ b/input/script_utils.go @@ -3239,3 +3239,36 @@ func ComputeCommitmentPoint(commitSecret []byte) *btcec.PublicKey { _, pubKey := btcec.PrivKeyFromBytes(commitSecret) return pubKey } + +// ScriptIsOpReturn returns true if the passed script is an OP_RETURN script. +// +// Lifted from the txscript package: +// https://github.com/btcsuite/btcd/blob/cc26860b40265e1332cca8748c5dbaf3c81cc094/txscript/standard.go#L493-L526. +// +//nolint:ll +func ScriptIsOpReturn(script []byte) bool { + // A null script is of the form: + // OP_RETURN + // + // Thus, it can either be a single OP_RETURN or an OP_RETURN followed by + // a data push up to MaxDataCarrierSize bytes. + + // The script can't possibly be a null data script if it doesn't start + // with OP_RETURN. Fail fast to avoid more work below. + if len(script) < 1 || script[0] != txscript.OP_RETURN { + return false + } + + // Single OP_RETURN. + if len(script) == 1 { + return true + } + + // OP_RETURN followed by data push up to MaxDataCarrierSize bytes. + tokenizer := txscript.MakeScriptTokenizer(0, script[1:]) + + return tokenizer.Next() && tokenizer.Done() && + (txscript.IsSmallInt(tokenizer.Opcode()) || + tokenizer.Opcode() <= txscript.OP_PUSHDATA4) && + len(tokenizer.Data()) <= txscript.MaxDataCarrierSize +} From bf3007a2ce750cd40efcdae79c43cc7a74e6f5ad Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Mon, 10 Feb 2025 18:34:34 -0800 Subject: [PATCH 10/48] multi: thread thru RPC caller context from CloseChannel --- htlcswitch/switch.go | 9 ++++- peer/brontide.go | 88 ++++++++++++++++++++++---------------------- peer/test_utils.go | 2 +- rpcserver.go | 5 ++- server.go | 4 +- 5 files changed, 59 insertions(+), 49 deletions(-) diff --git a/htlcswitch/switch.go b/htlcswitch/switch.go index cf53f728a..fea5496c9 100644 --- a/htlcswitch/switch.go +++ b/htlcswitch/switch.go @@ -2,6 +2,7 @@ package htlcswitch import ( "bytes" + "context" "errors" "fmt" "math/rand" @@ -125,6 +126,9 @@ type ChanClose struct { // Err is used by request creator to receive request execution error. Err chan error + + // Ctx is a context linked to the lifetime of the caller. + Ctx context.Context //nolint:containedctx } // Config defines the configuration for the service. ALL elements within the @@ -1413,7 +1417,7 @@ func (s *Switch) teardownCircuit(pkt *htlcPacket) error { // targetFeePerKw parameter should be the ideal fee-per-kw that will be used as // a starting point for close negotiation. The deliveryScript parameter is an // optional parameter which sets a user specified script to close out to. -func (s *Switch) CloseLink(chanPoint *wire.OutPoint, +func (s *Switch) CloseLink(ctx context.Context, chanPoint *wire.OutPoint, closeType contractcourt.ChannelCloseType, targetFeePerKw, maxFee chainfee.SatPerKWeight, deliveryScript lnwire.DeliveryAddress) (chan interface{}, chan error) { @@ -1427,9 +1431,10 @@ func (s *Switch) CloseLink(chanPoint *wire.OutPoint, ChanPoint: chanPoint, Updates: updateChan, TargetFeePerKw: targetFeePerKw, - MaxFee: maxFee, DeliveryScript: deliveryScript, Err: errChan, + MaxFee: maxFee, + Ctx: ctx, } select { diff --git a/peer/brontide.go b/peer/brontide.go index 2e09aeaad..19a2d8eb3 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -585,8 +585,11 @@ type Brontide struct { globalMsgRouter bool startReady chan struct{} - quit chan struct{} - wg sync.WaitGroup + + // cg is a helper that encapsulates a wait group and quit channel and + // allows contexts that either block or cancel on those depending on + // the use case. + cg *fn.ContextGuard // log is a peer-specific logging instance. log btclog.Logger @@ -630,10 +633,10 @@ func NewBrontide(cfg Config) *Brontide { chanCloseMsgs: make(chan *closeMsg), resentChanSyncMsg: make(map[lnwire.ChannelID]struct{}), startReady: make(chan struct{}), - quit: make(chan struct{}), log: peerLog.WithPrefix(logPrefix), msgRouter: msgRouter, globalMsgRouter: globalMsgRouter, + cg: fn.NewContextGuard(), } if cfg.Conn != nil && cfg.Conn.RemoteAddr() != nil { @@ -757,9 +760,9 @@ func (p *Brontide) Start() error { // message MUST be sent before any other message. readErr := make(chan error, 1) msgChan := make(chan lnwire.Message, 1) - p.wg.Add(1) + p.cg.WgAdd(1) go func() { - defer p.wg.Done() + defer p.cg.WgDone() msg, err := p.readNextMessage() if err != nil { @@ -848,7 +851,7 @@ func (p *Brontide) Start() error { return fmt.Errorf("could not start ping manager %w", err) } - p.wg.Add(4) + p.cg.WgAdd(4) go p.queueHandler() go p.writeHandler() go p.channelManager() @@ -868,7 +871,7 @@ func (p *Brontide) Start() error { // // TODO(wilmer): Remove this once we're able to query for node // announcements through their timestamps. - p.wg.Add(2) + p.cg.WgAdd(2) go p.maybeSendNodeAnn(activeChans) go p.maybeSendChannelUpdates() @@ -917,7 +920,7 @@ func (p *Brontide) taprootShutdownAllowed() bool { // // NOTE: Part of the lnpeer.Peer interface. func (p *Brontide) QuitSignal() <-chan struct{} { - return p.quit + return p.cg.Done() } // addrWithInternalKey takes a delivery script, then attempts to supplement it @@ -1279,7 +1282,7 @@ func (p *Brontide) addLink(chanPoint *wire.OutPoint, select { case p.linkFailures <- failure: - case <-p.quit: + case <-p.cg.Done(): case <-p.cfg.Quit: } } @@ -1356,7 +1359,7 @@ func (p *Brontide) addLink(chanPoint *wire.OutPoint, // maybeSendNodeAnn sends our node announcement to the remote peer if at least // one confirmed public channel exists with them. func (p *Brontide) maybeSendNodeAnn(channels []*channeldb.OpenChannel) { - defer p.wg.Done() + defer p.cg.WgDone() hasConfirmedPublicChan := false for _, channel := range channels { @@ -1388,7 +1391,7 @@ func (p *Brontide) maybeSendNodeAnn(channels []*channeldb.OpenChannel) { // maybeSendChannelUpdates sends our channel updates to the remote peer if we // have any active channels with them. func (p *Brontide) maybeSendChannelUpdates() { - defer p.wg.Done() + defer p.cg.WgDone() // If we don't have any active channels, then we can exit early. if p.activeChannels.Len() == 0 { @@ -1464,16 +1467,16 @@ func (p *Brontide) WaitForDisconnect(ready chan struct{}) { // set of goroutines are already active. select { case <-p.startReady: - case <-p.quit: + case <-p.cg.Done(): return } select { case <-ready: - case <-p.quit: + case <-p.cg.Done(): } - p.wg.Wait() + p.cg.WgWait() } // Disconnect terminates the connection with the remote peer. Additionally, a @@ -1495,7 +1498,7 @@ func (p *Brontide) Disconnect(reason error) { select { case <-p.startReady: - case <-p.quit: + case <-p.cg.Done(): return } } @@ -1511,7 +1514,7 @@ func (p *Brontide) Disconnect(reason error) { // Ensure that the TCP connection is properly closed before continuing. p.cfg.Conn.Close() - close(p.quit) + p.cg.Quit() // If our msg router isn't global (local to this instance), then we'll // stop it. Otherwise, we'll leave it running. @@ -1692,7 +1695,7 @@ func (ms *msgStream) msgConsumer() { // Otherwise, we'll check the message queue for any new // items. select { - case <-ms.peer.quit: + case <-ms.peer.cg.Done(): ms.msgCond.L.Unlock() return case <-ms.quit: @@ -1719,7 +1722,7 @@ func (ms *msgStream) msgConsumer() { // grow indefinitely. select { case ms.producerSema <- struct{}{}: - case <-ms.peer.quit: + case <-ms.peer.cg.Done(): return case <-ms.quit: return @@ -1737,7 +1740,7 @@ func (ms *msgStream) AddMsg(msg lnwire.Message) { // we're signalled to quit, or a slot is freed up. select { case <-ms.producerSema: - case <-ms.peer.quit: + case <-ms.peer.cg.Done(): return case <-ms.quit: return @@ -1814,7 +1817,7 @@ func waitUntilLinkActive(p *Brontide, // calling function should catch it. return p.fetchLinkFromKeyAndCid(cid) - case <-p.quit: + case <-p.cg.Done(): return nil } } @@ -1848,7 +1851,7 @@ func newChanMsgStream(p *Brontide, cid lnwire.ChannelID) *msgStream { // as the peer is exiting, we'll check quickly to see // if we need to exit. select { - case <-p.quit: + case <-p.cg.Done(): return default: } @@ -1888,7 +1891,7 @@ func newDiscMsgStream(p *Brontide) *msgStream { // // NOTE: This method MUST be run as a goroutine. func (p *Brontide) readHandler() { - defer p.wg.Done() + defer p.cg.WgDone() // We'll stop the timer after a new messages is received, and also // reset it after we process the next message. @@ -2009,13 +2012,13 @@ out: case *lnwire.Shutdown: select { case p.chanCloseMsgs <- &closeMsg{msg.ChannelID, msg}: - case <-p.quit: + case <-p.cg.Done(): break out } case *lnwire.ClosingSigned: select { case p.chanCloseMsgs <- &closeMsg{msg.ChannelID, msg}: - case <-p.quit: + case <-p.cg.Done(): break out } @@ -2587,7 +2590,7 @@ out: break out } - case <-p.quit: + case <-p.cg.Done(): exitErr = lnpeer.ErrPeerExiting break out } @@ -2595,7 +2598,7 @@ out: // Avoid an exit deadlock by ensuring WaitGroups are decremented before // disconnect. - p.wg.Done() + p.cg.WgDone() p.Disconnect(exitErr) @@ -2607,7 +2610,7 @@ out: // // NOTE: This method MUST be run as a goroutine. func (p *Brontide) queueHandler() { - defer p.wg.Done() + defer p.cg.WgDone() // priorityMsgs holds an in order list of messages deemed high-priority // to be added to the sendQueue. This predominately includes messages @@ -2648,7 +2651,7 @@ func (p *Brontide) queueHandler() { } else { lazyMsgs.PushBack(msg) } - case <-p.quit: + case <-p.cg.Done(): return } } else { @@ -2662,7 +2665,7 @@ func (p *Brontide) queueHandler() { } else { lazyMsgs.PushBack(msg) } - case <-p.quit: + case <-p.cg.Done(): return } } @@ -2696,7 +2699,7 @@ func (p *Brontide) queue(priority bool, msg lnwire.Message, select { case p.outgoingQueue <- outgoingMsg{priority, msg, errChan}: - case <-p.quit: + case <-p.cg.Done(): p.log.Tracef("Peer shutting down, could not enqueue msg: %v.", spew.Sdump(msg)) if errChan != nil { @@ -2764,7 +2767,7 @@ func (p *Brontide) genDeliveryScript() ([]byte, error) { // // NOTE: This method MUST be run as a goroutine. func (p *Brontide) channelManager() { - defer p.wg.Done() + defer p.cg.WgDone() // reenableTimeout will fire once after the configured channel status // interval has elapsed. This will trigger us to sign new channel @@ -2840,7 +2843,7 @@ out: p.channelEventClient.Cancel() } - case <-p.quit: + case <-p.cg.Done(): // As, we've been signalled to exit, we'll reset all // our active channel back to their default state. p.activeChannels.ForEach(func(_ lnwire.ChannelID, @@ -3123,7 +3126,7 @@ func (p *Brontide) retryRequestEnable(activeChans map[wire.OutPoint]struct{}) { p.log.Warnf("Re-enable channel %v failed, received "+ "inactive link event", chanPoint) - case <-p.quit: + case <-p.cg.Done(): p.log.Debugf("Peer shutdown during retry enabling") return } @@ -3294,7 +3297,6 @@ func (p *Brontide) createChanCloser(channel *lnwallet.LightningChannel, return p.cfg.DisconnectPeer(p.IdentityKey()) }, ChainParams: &p.cfg.Wallet.Cfg.NetParams, - Quit: p.quit, }, *deliveryScript, fee, @@ -3859,7 +3861,7 @@ func (p *Brontide) sendMessage(sync, priority bool, msgs ...lnwire.Message) erro select { case err := <-errChan: return err - case <-p.quit: + case <-p.cg.Done(): return lnpeer.ErrPeerExiting case <-p.cfg.Quit: return lnpeer.ErrPeerExiting @@ -3907,7 +3909,7 @@ func (p *Brontide) AddNewChannel(newChan *lnpeer.NewChannel, case p.newActiveChannel <- newChanMsg: case <-cancel: return errors.New("canceled adding new channel") - case <-p.quit: + case <-p.cg.Done(): return lnpeer.ErrPeerExiting } @@ -3916,7 +3918,7 @@ func (p *Brontide) AddNewChannel(newChan *lnpeer.NewChannel, select { case err := <-errChan: return err - case <-p.quit: + case <-p.cg.Done(): return lnpeer.ErrPeerExiting } } @@ -3940,7 +3942,7 @@ func (p *Brontide) AddPendingChannel(cid lnwire.ChannelID, case <-cancel: return errors.New("canceled adding pending channel") - case <-p.quit: + case <-p.cg.Done(): return lnpeer.ErrPeerExiting } @@ -3954,7 +3956,7 @@ func (p *Brontide) AddPendingChannel(cid lnwire.ChannelID, case <-cancel: return errors.New("canceled adding pending channel") - case <-p.quit: + case <-p.cg.Done(): return lnpeer.ErrPeerExiting } } @@ -3971,7 +3973,7 @@ func (p *Brontide) RemovePendingChannel(cid lnwire.ChannelID) error { select { case p.removePendingChannel <- newChanMsg: - case <-p.quit: + case <-p.cg.Done(): return lnpeer.ErrPeerExiting } @@ -3982,7 +3984,7 @@ func (p *Brontide) RemovePendingChannel(cid lnwire.ChannelID) error { case err := <-errChan: return err - case <-p.quit: + case <-p.cg.Done(): return lnpeer.ErrPeerExiting } } @@ -4134,7 +4136,7 @@ func (p *Brontide) HandleLocalCloseChanReqs(req *htlcswitch.ChanClose) { case p.localCloseChanReqs <- req: p.log.Info("Local close channel request is going to be " + "delivered to the peer") - case <-p.quit: + case <-p.cg.Done(): p.log.Info("Unable to deliver local close channel request " + "to peer") } @@ -4464,7 +4466,7 @@ func (p *Brontide) sendLinkUpdateMsg(cid lnwire.ChannelID, msg lnwire.Message) { // Stop the stream when quit. go func() { - <-p.quit + <-p.cg.Done() chanStream.Stop() }() } diff --git a/peer/test_utils.go b/peer/test_utils.go index 34c42e2f7..bcde83bf9 100644 --- a/peer/test_utils.go +++ b/peer/test_utils.go @@ -337,7 +337,7 @@ func createTestPeerWithChannel(t *testing.T, updateChan func(a, chanID := lnwire.NewChanIDFromOutPoint(channelAlice.ChannelPoint()) alicePeer.activeChannels.Store(chanID, channelAlice) - alicePeer.wg.Add(1) + alicePeer.cg.WgAdd(1) go alicePeer.channelManager() return &peerTestCtx{ diff --git a/rpcserver.go b/rpcserver.go index ad8806059..525847f94 100644 --- a/rpcserver.go +++ b/rpcserver.go @@ -2887,8 +2887,9 @@ func (r *rpcServer) CloseChannel(in *lnrpc.CloseChannelRequest, } updateChan, errChan = r.server.htlcSwitch.CloseLink( - chanPoint, contractcourt.CloseRegular, feeRate, - maxFee, deliveryScript, + updateStream.Context(), chanPoint, + contractcourt.CloseRegular, feeRate, maxFee, + deliveryScript, ) } diff --git a/server.go b/server.go index a848340d5..5d21e3e7e 100644 --- a/server.go +++ b/server.go @@ -1292,7 +1292,9 @@ func newServer(cfg *Config, listenAddrs []net.Addr, // Instruct the switch to close the channel. Provide no close out // delivery script or target fee per kw because user input is not // available when the remote peer closes the channel. - s.htlcSwitch.CloseLink(chanPoint, closureType, 0, 0, nil) + s.htlcSwitch.CloseLink( + context.Background(), chanPoint, closureType, 0, 0, nil, + ) } // We will use the following channel to reliably hand off contract From ed8a672bd39eeb0610c501501023d69af37a019d Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 27 Feb 2025 13:56:38 -0800 Subject: [PATCH 11/48] protofsm: update StateMachine to meet new msgmux.Endpoint interface --- protofsm/state_machine.go | 5 +++-- protofsm/state_machine_test.go | 11 ++++++++--- 2 files changed, 11 insertions(+), 5 deletions(-) diff --git a/protofsm/state_machine.go b/protofsm/state_machine.go index bf61d727c..0e0343587 100644 --- a/protofsm/state_machine.go +++ b/protofsm/state_machine.go @@ -14,6 +14,7 @@ import ( "github.com/lightningnetwork/lnd/fn/v2" "github.com/lightningnetwork/lnd/lnutils" "github.com/lightningnetwork/lnd/lnwire" + "github.com/lightningnetwork/lnd/msgmux" ) const ( @@ -250,7 +251,7 @@ func (s *StateMachine[Event, Env]) SendEvent(ctx context.Context, event Event) { // CanHandle returns true if the target message can be routed to the state // machine. -func (s *StateMachine[Event, Env]) CanHandle(msg lnwire.Message) bool { +func (s *StateMachine[Event, Env]) CanHandle(msg msgmux.PeerMsg) bool { cfgMapper := s.cfg.MsgMapper return fn.MapOptionZ(cfgMapper, func(mapper MsgMapper[Event]) bool { return mapper.MapMsg(msg).IsSome() @@ -267,7 +268,7 @@ func (s *StateMachine[Event, Env]) Name() string { // returned indicating that the message was processed. Otherwise, false is // returned. func (s *StateMachine[Event, Env]) SendMessage(ctx context.Context, - msg lnwire.Message) bool { + msg msgmux.PeerMsg) bool { // If we have no message mapper, then return false as we can't process // this message. diff --git a/protofsm/state_machine_test.go b/protofsm/state_machine_test.go index 8ac5ec603..ed18743b5 100644 --- a/protofsm/state_machine_test.go +++ b/protofsm/state_machine_test.go @@ -13,6 +13,7 @@ import ( "github.com/lightningnetwork/lnd/chainntnfs" "github.com/lightningnetwork/lnd/fn/v2" "github.com/lightningnetwork/lnd/lnwire" + "github.com/lightningnetwork/lnd/msgmux" "github.com/stretchr/testify/mock" "github.com/stretchr/testify/require" ) @@ -429,8 +430,12 @@ func TestStateMachineMsgMapper(t *testing.T) { // The only thing we know how to map is the error message, which'll // terminate the state machine. - wireError := &lnwire.Error{} - initMsg := &lnwire.Init{} + wireError := msgmux.PeerMsg{ + Message: &lnwire.Error{}, + } + initMsg := msgmux.PeerMsg{ + Message: &lnwire.Init{}, + } dummyMapper.On("MapMsg", wireError).Return( fn.Some(dummyEvents(&goToFin{})), ) @@ -456,7 +461,7 @@ func TestStateMachineMsgMapper(t *testing.T) { // First, we'll verify that the CanHandle method works as expected. require.True(t, stateMachine.CanHandle(wireError)) - require.False(t, stateMachine.CanHandle(&lnwire.Init{})) + require.False(t, stateMachine.CanHandle(initMsg)) // Next, we'll attempt to send the wire message into the state machine. // We should transition to the final state. From b2794b07cb6e0a3663f185d0e9c1b5dd7336d767 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Fri, 7 Feb 2025 18:10:45 -0800 Subject: [PATCH 12/48] lnwallet/chancloser: enforce pubkey binding for msg mapper --- lnwallet/chancloser/rbf_coop_msg_mapper.go | 27 ++++++++++++++-------- lnwallet/chancloser/rbf_coop_test.go | 2 +- protofsm/msg_mapper.go | 4 ++-- protofsm/state_machine_test.go | 2 +- 4 files changed, 22 insertions(+), 13 deletions(-) diff --git a/lnwallet/chancloser/rbf_coop_msg_mapper.go b/lnwallet/chancloser/rbf_coop_msg_mapper.go index 96c855686..a66cf78cc 100644 --- a/lnwallet/chancloser/rbf_coop_msg_mapper.go +++ b/lnwallet/chancloser/rbf_coop_msg_mapper.go @@ -1,8 +1,10 @@ package chancloser import ( + "github.com/btcsuite/btcd/btcec/v2" "github.com/lightningnetwork/lnd/fn/v2" "github.com/lightningnetwork/lnd/lnwire" + "github.com/lightningnetwork/lnd/msgmux" ) // RbfMsgMapper is a struct that implements the MsgMapper interface for the @@ -16,16 +18,21 @@ type RbfMsgMapper struct { // chanID is the channel ID of the channel being closed. chanID lnwire.ChannelID + + // peerPub is the public key of the peer that the channel is being + // closed. + peerPub btcec.PublicKey } // NewRbfMsgMapper creates a new RbfMsgMapper instance given the current block // height when the co-op close request was initiated. func NewRbfMsgMapper(blockHeight uint32, - chanID lnwire.ChannelID) *RbfMsgMapper { + chanID lnwire.ChannelID, peerPub btcec.PublicKey) *RbfMsgMapper { return &RbfMsgMapper{ blockHeight: blockHeight, chanID: chanID, + peerPub: peerPub, } } @@ -34,18 +41,20 @@ func someEvent[T ProtocolEvent](m T) fn.Option[ProtocolEvent] { return fn.Some(ProtocolEvent(m)) } -// isExpectedChanID returns true if the channel ID of the message matches the +// isForUs returns true if the channel ID + pubkey of the message matches the // bound instance. -func (r *RbfMsgMapper) isExpectedChanID(chanID lnwire.ChannelID) bool { - return r.chanID == chanID +func (r *RbfMsgMapper) isForUs(chanID lnwire.ChannelID, + fromPub btcec.PublicKey) bool { + + return r.chanID == chanID && r.peerPub.IsEqual(&fromPub) } // MapMsg maps a wire message into a FSM event. If the message is not mappable, // then an error is returned. -func (r *RbfMsgMapper) MapMsg(wireMsg lnwire.Message) fn.Option[ProtocolEvent] { - switch msg := wireMsg.(type) { +func (r *RbfMsgMapper) MapMsg(wireMsg msgmux.PeerMsg) fn.Option[ProtocolEvent] { + switch msg := wireMsg.Message.(type) { case *lnwire.Shutdown: - if !r.isExpectedChanID(msg.ChannelID) { + if !r.isForUs(msg.ChannelID, wireMsg.PeerPub) { return fn.None[ProtocolEvent]() } @@ -55,7 +64,7 @@ func (r *RbfMsgMapper) MapMsg(wireMsg lnwire.Message) fn.Option[ProtocolEvent] { }) case *lnwire.ClosingComplete: - if !r.isExpectedChanID(msg.ChannelID) { + if !r.isForUs(msg.ChannelID, wireMsg.PeerPub) { return fn.None[ProtocolEvent]() } @@ -64,7 +73,7 @@ func (r *RbfMsgMapper) MapMsg(wireMsg lnwire.Message) fn.Option[ProtocolEvent] { }) case *lnwire.ClosingSig: - if !r.isExpectedChanID(msg.ChannelID) { + if !r.isForUs(msg.ChannelID, wireMsg.PeerPub) { return fn.None[ProtocolEvent]() } diff --git a/lnwallet/chancloser/rbf_coop_test.go b/lnwallet/chancloser/rbf_coop_test.go index 17d783eae..d0bd76472 100644 --- a/lnwallet/chancloser/rbf_coop_test.go +++ b/lnwallet/chancloser/rbf_coop_test.go @@ -687,7 +687,7 @@ func newRbfCloserTestHarness(t *testing.T, peerPub := randPubKey(t) - msgMapper := NewRbfMsgMapper(uint32(startingHeight), chanID) + msgMapper := NewRbfMsgMapper(uint32(startingHeight), chanID, *peerPub) initialState := cfg.initialState.UnwrapOr(&ChannelActive{}) diff --git a/protofsm/msg_mapper.go b/protofsm/msg_mapper.go index 5e24255fa..a00d86379 100644 --- a/protofsm/msg_mapper.go +++ b/protofsm/msg_mapper.go @@ -2,7 +2,7 @@ package protofsm import ( "github.com/lightningnetwork/lnd/fn/v2" - "github.com/lightningnetwork/lnd/lnwire" + "github.com/lightningnetwork/lnd/msgmux" ) // MsgMapper is used to map incoming wire messages into a FSM event. This is @@ -11,5 +11,5 @@ import ( type MsgMapper[Event any] interface { // MapMsg maps a wire message into a FSM event. If the message is not // mappable, then an None is returned. - MapMsg(msg lnwire.Message) fn.Option[Event] + MapMsg(msg msgmux.PeerMsg) fn.Option[Event] } diff --git a/protofsm/state_machine_test.go b/protofsm/state_machine_test.go index ed18743b5..ca05d336c 100644 --- a/protofsm/state_machine_test.go +++ b/protofsm/state_machine_test.go @@ -406,7 +406,7 @@ type dummyMsgMapper struct { mock.Mock } -func (d *dummyMsgMapper) MapMsg(wireMsg lnwire.Message) fn.Option[dummyEvents] { +func (d *dummyMsgMapper) MapMsg(wireMsg msgmux.PeerMsg) fn.Option[dummyEvents] { args := d.Called(wireMsg) //nolint:forcetypeassert From 8432e706d35535f091a9f31e9c69fe4746b41d42 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Mon, 10 Feb 2025 19:05:52 -0800 Subject: [PATCH 13/48] multi: extract new DeriveHeightHint() function, use for new rbf closer With this commit, we make sure we set the right height hint, even if the channel is a zero conf channel. --- channeldb/channel.go | 28 ++++++++++++++++++++++++++++ contractcourt/chain_watcher.go | 30 +----------------------------- lnwallet/channel.go | 8 ++++++++ 3 files changed, 37 insertions(+), 29 deletions(-) diff --git a/channeldb/channel.go b/channeldb/channel.go index 6bf20373c..e16537f1c 100644 --- a/channeldb/channel.go +++ b/channeldb/channel.go @@ -4104,6 +4104,34 @@ func (c *OpenChannel) AbsoluteThawHeight() (uint32, error) { return c.ThawHeight, nil } +// DeriveHeightHint derives the block height for the channel opening. +func (c *OpenChannel) DeriveHeightHint() uint32 { + // As a height hint, we'll try to use the opening height, but if the + // channel isn't yet open, then we'll use the height it was broadcast + // at. This may be an unconfirmed zero-conf channel. + heightHint := c.ShortChanID().BlockHeight + if heightHint == 0 { + heightHint = c.BroadcastHeight() + } + + // Since no zero-conf state is stored in a channel backup, the below + // logic will not be triggered for restored, zero-conf channels. Set + // the height hint for zero-conf channels. + if c.IsZeroConf() { + if c.ZeroConfConfirmed() { + // If the zero-conf channel is confirmed, we'll use the + // confirmed SCID's block height. + heightHint = c.ZeroConfRealScid().BlockHeight + } else { + // The zero-conf channel is unconfirmed. We'll need to + // use the FundingBroadcastHeight. + heightHint = c.BroadcastHeight() + } + } + + return heightHint +} + func putChannelCloseSummary(tx kvdb.RwTx, chanID []byte, summary *ChannelCloseSummary, lastChanState *OpenChannel) error { diff --git a/contractcourt/chain_watcher.go b/contractcourt/chain_watcher.go index fef70b945..06665af29 100644 --- a/contractcourt/chain_watcher.go +++ b/contractcourt/chain_watcher.go @@ -281,7 +281,7 @@ func newChainWatcher(cfg chainWatcherConfig) (*chainWatcher, error) { } // Get the channel opening block height. - heightHint := deriveHeightHint(chanState) + heightHint := chanState.DeriveHeightHint() // We'll register for a notification to be dispatched if the funding // output is spent. @@ -1328,34 +1328,6 @@ func deriveFundingPkScript(chanState *channeldb.OpenChannel) ([]byte, error) { return fundingPkScript, nil } -// deriveHeightHint derives the block height for the channel opening. -func deriveHeightHint(chanState *channeldb.OpenChannel) uint32 { - // As a height hint, we'll try to use the opening height, but if the - // channel isn't yet open, then we'll use the height it was broadcast - // at. This may be an unconfirmed zero-conf channel. - heightHint := chanState.ShortChanID().BlockHeight - if heightHint == 0 { - heightHint = chanState.BroadcastHeight() - } - - // Since no zero-conf state is stored in a channel backup, the below - // logic will not be triggered for restored, zero-conf channels. Set - // the height hint for zero-conf channels. - if chanState.IsZeroConf() { - if chanState.ZeroConfConfirmed() { - // If the zero-conf channel is confirmed, we'll use the - // confirmed SCID's block height. - heightHint = chanState.ZeroConfRealScid().BlockHeight - } else { - // The zero-conf channel is unconfirmed. We'll need to - // use the FundingBroadcastHeight. - heightHint = chanState.BroadcastHeight() - } - } - - return heightHint -} - // handleCommitSpend takes a spending tx of the funding output and handles the // channel close based on the closure type. func (c *chainWatcher) handleCommitSpend( diff --git a/lnwallet/channel.go b/lnwallet/channel.go index bc9820e8f..aa8e21e76 100644 --- a/lnwallet/channel.go +++ b/lnwallet/channel.go @@ -9874,6 +9874,14 @@ func (lc *LightningChannel) FundingTxOut() *wire.TxOut { return &lc.fundingOutput } +// DeriveHeightHint derives the block height for the channel opening. +func (lc *LightningChannel) DeriveHeightHint() uint32 { + lc.RLock() + defer lc.RUnlock() + + return lc.channelState.DeriveHeightHint() +} + // MultiSigKeys returns the set of multi-sig keys for an channel. func (lc *LightningChannel) MultiSigKeys() (keychain.KeyDescriptor, keychain.KeyDescriptor) { From baf0d83c3766ebf73655e6eff3b858c763a592a2 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 25 Feb 2025 18:55:06 -0800 Subject: [PATCH 14/48] peer: update chooseDeliveryScript to gen script if needed In this commit, we update `chooseDeliveryScript` to generate a new script if needed. This allows us to fold in a few other lines that always followed this function into this expanded function. The tests have been updated accordingly. --- peer/brontide.go | 34 +++++++++++++++------------------- peer/brontide_test.go | 25 ++++++++++++++++--------- 2 files changed, 31 insertions(+), 28 deletions(-) diff --git a/peer/brontide.go b/peer/brontide.go index 19a2d8eb3..4e99923d7 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -3136,32 +3136,37 @@ func (p *Brontide) retryRequestEnable(activeChans map[wire.OutPoint]struct{}) { // chooseDeliveryScript takes two optionally set shutdown scripts and returns // a suitable script to close out to. This may be nil if neither script is // set. If both scripts are set, this function will error if they do not match. -func chooseDeliveryScript(upfront, - requested lnwire.DeliveryAddress) (lnwire.DeliveryAddress, error) { +func chooseDeliveryScript(upfront, requested lnwire.DeliveryAddress, + genDeliveryScript func() ([]byte, error), +) (lnwire.DeliveryAddress, error) { + + switch { + // If no script was provided, then we'll generate a new delivery script. + case len(upfront) == 0 && len(requested) == 0: + return genDeliveryScript() // If no upfront shutdown script was provided, return the user // requested address (which may be nil). - if len(upfront) == 0 { + case len(upfront) == 0: return requested, nil - } // If an upfront shutdown script was provided, and the user did not // request a custom shutdown script, return the upfront address. - if len(requested) == 0 { + case len(requested) == 0: return upfront, nil - } // If both an upfront shutdown script and a custom close script were // provided, error if the user provided shutdown script does not match // the upfront shutdown script (because closing out to a different // script would violate upfront shutdown). - if !bytes.Equal(upfront, requested) { + case !bytes.Equal(upfront, requested): return nil, chancloser.ErrUpfrontShutdownScriptMismatch - } // The user requested script matches the upfront shutdown script, so we // can return it without error. - return upfront, nil + default: + return upfront, nil + } } // restartCoopClose checks whether we need to restart the cooperative close @@ -3340,6 +3345,7 @@ func (p *Brontide) handleLocalCloseReq(req *htlcswitch.ChanClose) { // are set) and error if they are both set and do not match. deliveryScript, err := chooseDeliveryScript( channel.LocalUpfrontShutdownScript(), req.DeliveryScript, + p.genDeliveryScript, ) if err != nil { p.log.Errorf("cannot close channel %v: %v", req.ChanPoint, err) @@ -3347,16 +3353,6 @@ func (p *Brontide) handleLocalCloseReq(req *htlcswitch.ChanClose) { return } - // If neither an upfront address or a user set address was - // provided, generate a fresh script. - if len(deliveryScript) == 0 { - deliveryScript, err = p.genDeliveryScript() - if err != nil { - p.log.Errorf(err.Error()) - req.Err <- err - return - } - } addr, err := p.addrWithInternalKey(deliveryScript) if err != nil { err = fmt.Errorf("unable to parse addr for channel "+ diff --git a/peer/brontide_test.go b/peer/brontide_test.go index eded65888..283b62671 100644 --- a/peer/brontide_test.go +++ b/peer/brontide_test.go @@ -689,15 +689,9 @@ func TestChooseDeliveryScript(t *testing.T) { userScript lnwire.DeliveryAddress shutdownScript lnwire.DeliveryAddress expectedScript lnwire.DeliveryAddress + newAddr func() ([]byte, error) expectedError error }{ - { - name: "Neither set", - userScript: nil, - shutdownScript: nil, - expectedScript: nil, - expectedError: nil, - }, { name: "Both set and equal", userScript: script1, @@ -726,6 +720,16 @@ func TestChooseDeliveryScript(t *testing.T) { expectedScript: script2, expectedError: nil, }, + { + name: "no script generate new one", + userScript: nil, + shutdownScript: nil, + expectedScript: script2, + newAddr: func() ([]byte, error) { + return script2, nil + }, + expectedError: nil, + }, } for _, test := range tests { @@ -734,13 +738,16 @@ func TestChooseDeliveryScript(t *testing.T) { t.Run(test.name, func(t *testing.T) { script, err := chooseDeliveryScript( test.shutdownScript, test.userScript, + test.newAddr, ) if err != test.expectedError { - t.Fatalf("Expected: %v, got: %v", test.expectedError, err) + t.Fatalf("Expected: %v, got: %v", + test.expectedError, err) } if !bytes.Equal(script, test.expectedScript) { - t.Fatalf("Expected: %x, got: %x", test.expectedScript, script) + t.Fatalf("Expected: %x, got: %x", + test.expectedScript, script) } }) } From 8b2ade7ec905e37ad2a6ab1a3bb0af7cd54c0d29 Mon Sep 17 00:00:00 2001 From: yyforyongyu Date: Mon, 3 Mar 2025 10:00:38 +0800 Subject: [PATCH 15/48] lnwallet+protofsm: fix logging --- lnwallet/chancloser/rbf_coop_transitions.go | 7 ++++--- protofsm/state_machine.go | 2 +- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/lnwallet/chancloser/rbf_coop_transitions.go b/lnwallet/chancloser/rbf_coop_transitions.go index da45908b7..1c7612541 100644 --- a/lnwallet/chancloser/rbf_coop_transitions.go +++ b/lnwallet/chancloser/rbf_coop_transitions.go @@ -193,7 +193,8 @@ func (c *ChannelActive) ProcessEvent(event ProtocolEvent, env *Environment, // also emit similar events like the above to send out shutdown, and // also disable the channel. case *ShutdownReceived: - chancloserLog.Infof("ChannelPoint(%v): received shutdown msg") + chancloserLog.Infof("ChannelPoint(%v): received shutdown msg", + env.ChanPoint) // Validate that they can send the message now, and also that // they haven't violated their commitment to a prior upfront @@ -204,7 +205,7 @@ func (c *ChannelActive) ProcessEvent(event ProtocolEvent, env *Environment, ) if err != nil { chancloserLog.Errorf("ChannelPoint(%v): rejecting "+ - "shutdown attempt: %v", err) + "shutdown attempt: %v", env.ChanPoint, err) return nil, err } @@ -302,7 +303,7 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, ) if err != nil { chancloserLog.Errorf("ChannelPoint(%v): rejecting "+ - "shutdown attempt: %v", err) + "shutdown attempt: %v", env.ChanPoint, err) return nil, err } diff --git a/protofsm/state_machine.go b/protofsm/state_machine.go index 0e0343587..4d0215b69 100644 --- a/protofsm/state_machine.go +++ b/protofsm/state_machine.go @@ -345,7 +345,7 @@ func (s *StateMachine[Event, Env]) executeDaemonEvent(ctx context.Context, // any preconditions as well as post-send events. case *SendMsgEvent[Event]: sendAndCleanUp := func() error { - s.log.DebugS(ctx, "Sending message to target", + s.log.DebugS(ctx, "Sending message:", btclog.Hex6("target", daemonEvent.TargetPeer.SerializeCompressed()), "messages", lnutils.SpewLogClosure(daemonEvent.Msgs)) From 27b24ab86a2bbd959abc7206db20ab20ee523dc1 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:08:13 -0800 Subject: [PATCH 16/48] lnwallet/chancloser: add fee rate to ClosePending This'll be useful to communicate what the new fee rate is to an RPC caller. --- lnwallet/chancloser/rbf_coop_states.go | 6 ++++++ lnwallet/chancloser/rbf_coop_transitions.go | 15 ++++++++++++++- 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/lnwallet/chancloser/rbf_coop_states.go b/lnwallet/chancloser/rbf_coop_states.go index b6728629b..5b8ba8bcc 100644 --- a/lnwallet/chancloser/rbf_coop_states.go +++ b/lnwallet/chancloser/rbf_coop_states.go @@ -663,6 +663,9 @@ type LocalOfferSent struct { // ProposedFee is the fee we proposed to the remote party. ProposedFee btcutil.Amount + // ProposedFeeRate is the fee rate we proposed to the remote party. + ProposedFeeRate chainfee.SatPerVByte + // LocalSig is the signature we sent to the remote party. LocalSig lnwire.Sig } @@ -706,6 +709,9 @@ func (l *LocalOfferSent) IsTerminal() bool { type ClosePending struct { // CloseTx is the pending close transaction. CloseTx *wire.MsgTx + + // FeeRate is the fee rate of the closing transaction. + FeeRate chainfee.SatPerVByte } // String returns the name of the state for ClosePending. diff --git a/lnwallet/chancloser/rbf_coop_transitions.go b/lnwallet/chancloser/rbf_coop_transitions.go index 1c7612541..9dec4ccfb 100644 --- a/lnwallet/chancloser/rbf_coop_transitions.go +++ b/lnwallet/chancloser/rbf_coop_transitions.go @@ -4,6 +4,7 @@ import ( "fmt" "github.com/btcsuite/btcd/btcec/v2" + "github.com/btcsuite/btcd/btcutil" "github.com/btcsuite/btcd/chaincfg" "github.com/btcsuite/btcd/mempool" "github.com/btcsuite/btcd/wire" @@ -14,6 +15,7 @@ import ( "github.com/lightningnetwork/lnd/lntypes" "github.com/lightningnetwork/lnd/lnutils" "github.com/lightningnetwork/lnd/lnwallet" + "github.com/lightningnetwork/lnd/lnwallet/chainfee" "github.com/lightningnetwork/lnd/lnwire" "github.com/lightningnetwork/lnd/protofsm" "github.com/lightningnetwork/lnd/tlv" @@ -171,7 +173,7 @@ func (c *ChannelActive) ProcessEvent(event ProtocolEvent, env *Environment, } chancloserLog.Infof("ChannelPoint(%v): sending shutdown msg, "+ - "delivery_script=%v", env.ChanPoint, shutdownScript) + "delivery_script=%x", env.ChanPoint, shutdownScript) // From here, we'll transition to the shutdown pending state. In // this state we await their shutdown message (self loop), then @@ -730,6 +732,7 @@ func (l *LocalCloseStart) ProcessEvent(event ProtocolEvent, env *Environment, return &CloseStateTransition{ NextState: &LocalOfferSent{ ProposedFee: absoluteFee, + ProposedFeeRate: msg.TargetFeeRate, LocalSig: wireSig, CloseChannelTerms: l.CloseChannelTerms, }, @@ -839,6 +842,7 @@ func (l *LocalOfferSent) ProcessEvent(event ProtocolEvent, env *Environment, return &CloseStateTransition{ NextState: &ClosePending{ CloseTx: closeTx, + FeeRate: l.ProposedFeeRate, }, NewEvents: fn.Some(protofsm.EmittedEvent[ProtocolEvent]{ ExternalEvents: broadcastEvent, @@ -995,11 +999,20 @@ func (l *RemoteCloseStart) ProcessEvent(event ProtocolEvent, env *Environment, sendEvent, broadcastEvent, } + // We'll also compute the final fee rate that the remote party + // paid based off the absolute fee and the size of the closing + // transaction. + vSize := mempool.GetTxVirtualSize(btcutil.NewTx(closeTx)) + feeRate := chainfee.SatPerVByte( + int64(msg.SigMsg.FeeSatoshis) / vSize, + ) + // Now that we've extracted the signature, we'll transition to // the next state where we'll sign+broadcast the sig. return &CloseStateTransition{ NextState: &ClosePending{ CloseTx: closeTx, + FeeRate: feeRate, }, NewEvents: fn.Some(protofsm.EmittedEvent[ProtocolEvent]{ ExternalEvents: daemonEvents, From 835d7623d47d0fec5694cd5ee319252065987931 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:10:27 -0800 Subject: [PATCH 17/48] lnwallet/chancloser: ignore spurious channel flushed events If we go to close while the channel is already flushed, we might get an extra event, so we can safely ignore it and do a self state transition. --- lnwallet/chancloser/rbf_coop_transitions.go | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/lnwallet/chancloser/rbf_coop_transitions.go b/lnwallet/chancloser/rbf_coop_transitions.go index 9dec4ccfb..2667b7e4a 100644 --- a/lnwallet/chancloser/rbf_coop_transitions.go +++ b/lnwallet/chancloser/rbf_coop_transitions.go @@ -582,6 +582,12 @@ func (c *ClosingNegotiation) ProcessEvent(event ProtocolEvent, env *Environment, // we receive a confirmation event, or we receive a signal to restart // the co-op close process. switch msg := event.(type) { + // Ignore any potential duplicate channel flushed events. + case *ChannelFlushed: + return &CloseStateTransition{ + NextState: c, + }, nil + // If we get a confirmation, then the spend request we issued when we // were leaving the ChannelFlushing state has been confirmed. We'll // now transition to the StateFin state. From 14eca4406e0d77b90888704f11c73d636c04dc73 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Fri, 7 Feb 2025 18:15:36 -0800 Subject: [PATCH 18/48] lnwire: update closing_complete and closing_sig to latest spec draft Both these messages now carry the address of both parties, so you can update an address without needing to send shutdown again. --- lnwallet/chancloser/rbf_coop_transitions.go | 19 +++++++---- lnwire/closing_complete.go | 20 ++++++++++- lnwire/closing_sig.go | 38 ++++++++++++++++++++- lnwire/lnwire_test.go | 26 ++++++++++++++ 4 files changed, 94 insertions(+), 9 deletions(-) diff --git a/lnwallet/chancloser/rbf_coop_transitions.go b/lnwallet/chancloser/rbf_coop_transitions.go index 2667b7e4a..01ab5c32f 100644 --- a/lnwallet/chancloser/rbf_coop_transitions.go +++ b/lnwallet/chancloser/rbf_coop_transitions.go @@ -722,12 +722,13 @@ func (l *LocalCloseStart) ProcessEvent(event ProtocolEvent, env *Environment, // TODO(roasbeef): type alias for protocol event sendEvent := protofsm.DaemonEventSet{&protofsm.SendMsgEvent[ProtocolEvent]{ //nolint:ll TargetPeer: env.ChanPeer, - // TODO(roasbeef): mew new func Msgs: []lnwire.Message{&lnwire.ClosingComplete{ - ChannelID: env.ChanID, - FeeSatoshis: absoluteFee, - LockTime: env.BlockHeight, - ClosingSigs: closingSigs, + ChannelID: env.ChanID, + CloserScript: l.LocalDeliveryScript, + CloseeScript: l.RemoteDeliveryScript, + FeeSatoshis: absoluteFee, + LockTime: env.BlockHeight, + ClosingSigs: closingSigs, }}, }} @@ -991,8 +992,12 @@ func (l *RemoteCloseStart) ProcessEvent(event ProtocolEvent, env *Environment, sendEvent := &protofsm.SendMsgEvent[ProtocolEvent]{ TargetPeer: env.ChanPeer, Msgs: []lnwire.Message{&lnwire.ClosingSig{ - ChannelID: env.ChanID, - ClosingSigs: closingSigs, + ChannelID: env.ChanID, + CloserScript: l.RemoteDeliveryScript, + CloseeScript: l.LocalDeliveryScript, + FeeSatoshis: msg.SigMsg.FeeSatoshis, + LockTime: msg.SigMsg.LockTime, + ClosingSigs: closingSigs, }}, } broadcastEvent := &protofsm.BroadcastTxn{ diff --git a/lnwire/closing_complete.go b/lnwire/closing_complete.go index c16760a4e..4d390fd6f 100644 --- a/lnwire/closing_complete.go +++ b/lnwire/closing_complete.go @@ -30,6 +30,14 @@ type ClosingComplete struct { // ChannelID serves to identify which channel is to be closed. ChannelID ChannelID + // CloserScript is the script to which the channel funds will be paid + // for the closer (the person sending the ClosingComplete) message. + CloserScript DeliveryAddress + + // CloseeScript is the script to which the channel funds will be paid + // (the person receiving the ClosingComplete message). + CloseeScript DeliveryAddress + // FeeSatoshis is the total fee in satoshis that the party to the // channel would like to propose for the close transaction. FeeSatoshis btcutil.Amount @@ -79,7 +87,10 @@ func decodeClosingSigs(c *ClosingSigs, tlvRecords ExtraOpaqueData) error { // passed io.Reader. func (c *ClosingComplete) Decode(r io.Reader, _ uint32) error { // First, read out all the fields that are hard coded into the message. - err := ReadElements(r, &c.ChannelID, &c.FeeSatoshis, &c.LockTime) + err := ReadElements( + r, &c.ChannelID, &c.CloserScript, &c.CloseeScript, + &c.FeeSatoshis, &c.LockTime, + ) if err != nil { return err } @@ -125,6 +136,13 @@ func (c *ClosingComplete) Encode(w *bytes.Buffer, _ uint32) error { return err } + if err := WriteDeliveryAddress(w, c.CloserScript); err != nil { + return err + } + if err := WriteDeliveryAddress(w, c.CloseeScript); err != nil { + return err + } + if err := WriteSatoshi(w, c.FeeSatoshis); err != nil { return err } diff --git a/lnwire/closing_sig.go b/lnwire/closing_sig.go index df160d12e..2c73fa720 100644 --- a/lnwire/closing_sig.go +++ b/lnwire/closing_sig.go @@ -3,6 +3,8 @@ package lnwire import ( "bytes" "io" + + "github.com/btcsuite/btcd/btcutil" ) // ClosingSig is sent in response to a ClosingComplete message. It carries the @@ -11,6 +13,22 @@ type ClosingSig struct { // ChannelID serves to identify which channel is to be closed. ChannelID ChannelID + // CloserScript is the script to which the channel funds will be paid + // for the closer (the person sending the ClosingComplete) message. + CloserScript DeliveryAddress + + // CloseeScript is the script to which the channel funds will be paid + // (the person receiving the ClosingComplete message). + CloseeScript DeliveryAddress + + // FeeSatoshis is the total fee in satoshis that the party to the + // channel proposed for the close transaction. + FeeSatoshis btcutil.Amount + + // LockTime is the locktime number to be used in the input spending the + // funding transaction. + LockTime uint32 + // ClosingSigs houses the 3 possible signatures that can be sent. ClosingSigs @@ -24,7 +42,10 @@ type ClosingSig struct { // io.Reader. func (c *ClosingSig) Decode(r io.Reader, _ uint32) error { // First, read out all the fields that are hard coded into the message. - err := ReadElements(r, &c.ChannelID) + err := ReadElements( + r, &c.ChannelID, &c.CloserScript, &c.CloseeScript, + &c.FeeSatoshis, &c.LockTime, + ) if err != nil { return err } @@ -53,6 +74,21 @@ func (c *ClosingSig) Encode(w *bytes.Buffer, _ uint32) error { return err } + if err := WriteDeliveryAddress(w, c.CloserScript); err != nil { + return err + } + if err := WriteDeliveryAddress(w, c.CloseeScript); err != nil { + return err + } + + if err := WriteSatoshi(w, c.FeeSatoshis); err != nil { + return err + } + + if err := WriteUint32(w, c.LockTime); err != nil { + return err + } + recordProducers := closingSigRecords(&c.ClosingSigs) err := EncodeMessageExtraData(&c.ExtraData, recordProducers...) diff --git a/lnwire/lnwire_test.go b/lnwire/lnwire_test.go index db3ffd39d..123689902 100644 --- a/lnwire/lnwire_test.go +++ b/lnwire/lnwire_test.go @@ -1355,6 +1355,18 @@ func TestLightningWireProtocol(t *testing.T) { LockTime: uint32(r.Int63()), ClosingSigs: ClosingSigs{}, } + req.CloserScript, err = randDeliveryAddress(r) + if err != nil { + t.Fatalf("unable to generate delivery "+ + "address: %v", err) + return + } + req.CloseeScript, err = randDeliveryAddress(r) + if err != nil { + t.Fatalf("unable to generate delivery "+ + "address: %v", err) + return + } if r.Intn(2) == 0 { sig := req.CloserNoClosee.Zero() @@ -1403,6 +1415,20 @@ func TestLightningWireProtocol(t *testing.T) { req := ClosingSig{ ChannelID: ChannelID(c), ClosingSigs: ClosingSigs{}, + FeeSatoshis: btcutil.Amount(r.Int63()), + LockTime: uint32(r.Int63()), + } + req.CloserScript, err = randDeliveryAddress(r) + if err != nil { + t.Fatalf("unable to generate delivery "+ + "address: %v", err) + return + } + req.CloseeScript, err = randDeliveryAddress(r) + if err != nil { + t.Fatalf("unable to generate delivery "+ + "address: %v", err) + return } if r.Intn(2) == 0 { From e6d7a1a2ec2c080bf5b3fa2634ac47bc982d4f90 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Fri, 7 Feb 2025 18:21:06 -0800 Subject: [PATCH 19/48] protofsm: update state machine w/ new spec flow In this commit, we implement the latest version of the RBF loop as described in the spec. We remove the self loop back based on sending or receiving shutdown. Instead, from the ClosePending state, we can trigger a new loop by sending SendOfferEvent (we bump), or OfferReceivedEvent (they bump). We also update the rbf state machine w/ the new close addr logic. This log ensures that the remote party always sends our current address, and that if they send a new address, we'll update our view of it, and counter sign the correct transaction. We also add a CloseErr state. With this new state, we can ensure that we're able to properly report errors back to the RPC client, and also optionally force a reconnection or send a warning to the remote party. --- lnwallet/chancloser/rbf_coop_states.go | 148 ++++++++++- lnwallet/chancloser/rbf_coop_test.go | 276 +++++++++++++------- lnwallet/chancloser/rbf_coop_transitions.go | 196 +++++++++++--- 3 files changed, 491 insertions(+), 129 deletions(-) diff --git a/lnwallet/chancloser/rbf_coop_states.go b/lnwallet/chancloser/rbf_coop_states.go index 5b8ba8bcc..3850abfc9 100644 --- a/lnwallet/chancloser/rbf_coop_states.go +++ b/lnwallet/chancloser/rbf_coop_states.go @@ -49,6 +49,11 @@ var ( // ErrCloserAndClosee is returned when we expect a sig covering both // outputs, it isn't present. ErrCloserAndClosee = fmt.Errorf("expected CloserAndClosee sig") + + // ErrWrongLocalScript is returned when the remote party sends a + // ClosingComplete message that doesn't carry our last local script + // sent. + ErrWrongLocalScript = fmt.Errorf("wrong local script") ) // ProtocolEvent is a special interface used to create the equivalent of a @@ -382,7 +387,7 @@ type AsymmetricPeerState interface { type ProtocolStates interface { ChannelActive | ShutdownPending | ChannelFlushing | ClosingNegotiation | LocalCloseStart | LocalOfferSent | RemoteCloseStart | - ClosePending | CloseFin + ClosePending | CloseFin | CloseErr } // ChannelActive is the base state for the channel closer state machine. In @@ -523,6 +528,13 @@ type ClosingNegotiation struct { // the ShouldRouteTo method to determine which state route incoming // events to. PeerState lntypes.Dual[AsymmetricPeerState] + + // CloseChannelTerms is the terms we'll use to close the channel. We + // hold a value here which is pointed to by the various + // AsymmetricPeerState instances. This allows us to update this value if + // the remote peer sends a new address, with each of the state noting + // the new value via a pointer. + *CloseChannelTerms } // String returns the name of the state for ClosingNegotiation. @@ -542,6 +554,56 @@ func (c *ClosingNegotiation) IsTerminal() bool { // protocolSealed indicates that this struct is a ProtocolEvent instance. func (c *ClosingNegotiation) protocolStateSealed() {} +// ErrState can be used to introspect into a benign error related to a state +// transition. +type ErrState interface { + sealed() + + error + + // Err returns an error for the ErrState. + Err() error +} + +// ErrStateCantPayForFee is sent when the local party attempts a fee update +// that they can't actually party for. +type ErrStateCantPayForFee struct { + localBalance btcutil.Amount + + attemptedFee btcutil.Amount +} + +// NewErrStateCantPayForFee returns a new NewErrStateCantPayForFee error. +func NewErrStateCantPayForFee(localBalance, attemptedFee btcutil.Amount, +) *ErrStateCantPayForFee { + + return &ErrStateCantPayForFee{ + localBalance: localBalance, + attemptedFee: attemptedFee, + } +} + +// sealed makes this a sealed interface. +func (e *ErrStateCantPayForFee) sealed() { +} + +// Err returns an error for the ErrState. +func (e *ErrStateCantPayForFee) Err() error { + return fmt.Errorf("cannot pay for fee of %v, only have %v local "+ + "balance", e.attemptedFee, e.localBalance) +} + +// Error returns the error string for the ErrState. +func (e *ErrStateCantPayForFee) Error() string { + return e.Err().Error() +} + +// String returns the string for the ErrStateCantPayForFee. +func (e *ErrStateCantPayForFee) String() string { + return fmt.Sprintf("ErrStateCantPayForFee(local_balance=%v, "+ + "attempted_fee=%v)", e.localBalance, e.attemptedFee) +} + // CloseChannelTerms is a set of terms that we'll use to close the channel. This // includes the balances of the channel, and the scripts we'll use to send each // party's funds to. @@ -553,11 +615,11 @@ type CloseChannelTerms struct { // DeriveCloseTxOuts takes the close terms, and returns the local and remote tx // out for the close transaction. If an output is dust, then it'll be nil. -// -// TODO(roasbeef): add func for w/e heuristic to not manifest own output? func (c *CloseChannelTerms) DeriveCloseTxOuts() (*wire.TxOut, *wire.TxOut) { //nolint:ll deriveTxOut := func(balance btcutil.Amount, pkScript []byte) *wire.TxOut { + // We'll base the existence of the output on our normal dust + // check. dustLimit := lnwallet.DustLimitForSize(len(pkScript)) if balance >= dustLimit { return &wire.TxOut{ @@ -618,7 +680,7 @@ func (c *CloseChannelTerms) RemoteCanPayFees(absoluteFee btcutil.Amount) bool { // input events: // - SendOfferEvent type LocalCloseStart struct { - CloseChannelTerms + *CloseChannelTerms } // String returns the name of the state for LocalCloseStart, including proposed @@ -658,7 +720,7 @@ func (l *LocalCloseStart) protocolStateSealed() {} // input events: // - LocalSigReceived type LocalOfferSent struct { - CloseChannelTerms + *CloseChannelTerms // ProposedFee is the fee we proposed to the remote party. ProposedFee btcutil.Amount @@ -710,13 +772,26 @@ type ClosePending struct { // CloseTx is the pending close transaction. CloseTx *wire.MsgTx + *CloseChannelTerms + // FeeRate is the fee rate of the closing transaction. FeeRate chainfee.SatPerVByte + + // Party indicates which party is at this state. This is used to + // implement the state transition properly, based on ShouldRouteTo. + Party lntypes.ChannelParty } // String returns the name of the state for ClosePending. func (c *ClosePending) String() string { - return fmt.Sprintf("ClosePending(txid=%v)", c.CloseTx.TxHash()) + return fmt.Sprintf("ClosePending(txid=%v, party=%v, fee_rate=%v)", + c.CloseTx.TxHash(), c.Party, c.FeeRate) +} + +// isType returns true if the value is of type T. +func isType[T any](value any) bool { + _, ok := value.(T) + return ok } // ShouldRouteTo returns true if the target state should process the target @@ -726,6 +801,17 @@ func (c *ClosePending) ShouldRouteTo(event ProtocolEvent) bool { case *SpendEvent: return true default: + switch { + case c.Party == lntypes.Local && isType[*SendOfferEvent](event): + return true + + case c.Party == lntypes.Remote && isType[*OfferReceivedEvent]( + event, + ): + + return true + } + return false } } @@ -765,7 +851,7 @@ func (c *CloseFin) IsTerminal() bool { // - fromState: ChannelFlushing // - toState: ClosePending type RemoteCloseStart struct { - CloseChannelTerms + *CloseChannelTerms } // String returns the name of the state for RemoteCloseStart. @@ -792,6 +878,54 @@ func (l *RemoteCloseStart) IsTerminal() bool { return false } +// CloseErr is an error state in the protocol. We enter this state when a +// protocol constraint is violated, or an upfront sanity check fails. +type CloseErr struct { + ErrState + + *CloseChannelTerms + + // Party indicates which party is at this state. This is used to + // implement the state transition properly, based on ShouldRouteTo. + Party lntypes.ChannelParty +} + +// String returns the name of the state for CloseErr, including error and party +// details. +func (c *CloseErr) String() string { + return fmt.Sprintf("CloseErr(Party: %v, Error: %v)", c.Party, c.Err()) +} + +// ShouldRouteTo returns true if the target state should process the target +// event. +func (c *CloseErr) ShouldRouteTo(event ProtocolEvent) bool { + switch event.(type) { + case *SpendEvent: + return true + default: + switch { + case c.Party == lntypes.Local && isType[*SendOfferEvent](event): + return true + + case c.Party == lntypes.Remote && isType[*OfferReceivedEvent]( + event, + ): + + return true + } + + return false + } +} + +// protocolStateSealed indicates that this struct is a ProtocolEvent instance. +func (c *CloseErr) protocolStateSealed() {} + +// IsTerminal returns true if the target state is a terminal state. +func (c *CloseErr) IsTerminal() bool { + return true +} + // RbfChanCloser is a state machine that handles the RBF-enabled cooperative // channel close protocol. type RbfChanCloser = protofsm.StateMachine[ProtocolEvent, *Environment] diff --git a/lnwallet/chancloser/rbf_coop_test.go b/lnwallet/chancloser/rbf_coop_test.go index d0bd76472..7456025c3 100644 --- a/lnwallet/chancloser/rbf_coop_test.go +++ b/lnwallet/chancloser/rbf_coop_test.go @@ -110,7 +110,10 @@ func assertStateTransitions[Event any, Env protofsm.Environment]( t.Helper() for _, expectedState := range expectedStates { - newState := <-stateSub.NewItemCreated.ChanOut() + newState, err := fn.RecvOrTimeout( + stateSub.NewItemCreated.ChanOut(), 10*time.Millisecond, + ) + require.NoError(t, err, "expected state: %T", expectedState) require.IsType(t, expectedState, newState) } @@ -598,6 +601,8 @@ func (r *rbfCloserTestHarness) assertSingleRbfIteration( // response of the remote party, which completes one iteration localSigEvent := &LocalSigReceived{ SigMsg: lnwire.ClosingSig{ + CloserScript: localAddr, + CloseeScript: remoteAddr, ClosingSigs: lnwire.ClosingSigs{ CloserAndClosee: newSigTlv[tlv.TlvType3]( remoteWireSig, @@ -620,26 +625,16 @@ func (r *rbfCloserTestHarness) assertSingleRbfIteration( } func (r *rbfCloserTestHarness) assertSingleRemoteRbfIteration( - initEvent ProtocolEvent, balanceAfterClose, absoluteFee btcutil.Amount, - sequence uint32, iteration bool) { + initEvent *OfferReceivedEvent, balanceAfterClose, + absoluteFee btcutil.Amount, sequence uint32, iteration bool) { ctx := context.Background() - // If this is an iteration, then we expect some intermediate states, - // before we enter the main RBF/sign loop. - if iteration { - r.expectFeeEstimate(absoluteFee, 1) - - r.assertStateTransitions( - &ChannelActive{}, &ShutdownPending{}, - &ChannelFlushing{}, &ClosingNegotiation{}, - ) - } - // When we receive the signature below, our local state machine should // move to finalize the close. r.expectRemoteCloseFinalized( - &localSig, &remoteSig, localAddr, remoteAddr, + &localSig, &remoteSig, initEvent.SigMsg.CloseeScript, + initEvent.SigMsg.CloserScript, absoluteFee, balanceAfterClose, false, ) @@ -648,6 +643,13 @@ func (r *rbfCloserTestHarness) assertSingleRemoteRbfIteration( // Our outer state should transition to ClosingNegotiation state. r.assertStateTransitions(&ClosingNegotiation{}) + // If this is an iteration, then we'll go from ClosePending -> + // RemoteCloseStart -> ClosePending. So we'll assert an extra transition + // here. + if iteration { + r.assertStateTransitions(&ClosingNegotiation{}) + } + // If we examine the final resting state, we should see that the we're // now in the ClosePending state for the remote peer. currentState := assertStateT[*ClosingNegotiation](r) @@ -1184,9 +1186,10 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { startingState := &ClosingNegotiation{ PeerState: lntypes.Dual[AsymmetricPeerState]{ Local: &LocalCloseStart{ - CloseChannelTerms: *closeTerms, + CloseChannelTerms: closeTerms, }, }, + CloseChannelTerms: closeTerms, } sendOfferEvent := &SendOfferEvent{ @@ -1195,6 +1198,8 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { balanceAfterClose := localBalance.ToSatoshis() - absoluteFee + // TODO(roasbeef): add test case for error state validation, then resume + // In this state, we'll simulate deciding that we need to send a new // offer to the remote party. t.Run("send_offer_iteration_no_dust", func(t *testing.T) { @@ -1231,6 +1236,8 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { // we'll specify 2 signature fields. localSigEvent := &LocalSigReceived{ SigMsg: lnwire.ClosingSig{ + CloserScript: localAddr, + CloseeScript: remoteAddr, ClosingSigs: lnwire.ClosingSigs{ CloserNoClosee: newSigTlv[tlv.TlvType1]( remoteWireSig, @@ -1261,9 +1268,10 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { firstState := &ClosingNegotiation{ PeerState: lntypes.Dual[AsymmetricPeerState]{ Local: &LocalCloseStart{ - CloseChannelTerms: newCloseTerms, + CloseChannelTerms: &newCloseTerms, }, }, + CloseChannelTerms: &newCloseTerms, } closeHarness := newCloser(t, &harnessCfg{ @@ -1286,9 +1294,10 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { firstState := &ClosingNegotiation{ PeerState: lntypes.Dual[AsymmetricPeerState]{ Local: &LocalCloseStart{ - CloseChannelTerms: *closeTerms, + CloseChannelTerms: closeTerms, }, }, + CloseChannelTerms: closeTerms, } closeHarness := newCloser(t, &harnessCfg{ @@ -1306,15 +1315,55 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { ) }) + // In this test, we'll assert that we're able to restart the RBF loop + // to trigger additional signature iterations. + t.Run("send_offer_rbf_wrong_local_script", func(t *testing.T) { + firstState := &ClosingNegotiation{ + PeerState: lntypes.Dual[AsymmetricPeerState]{ + Local: &LocalCloseStart{ + CloseChannelTerms: closeTerms, + }, + }, + CloseChannelTerms: closeTerms, + } + + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState](firstState), + localUpfrontAddr: fn.Some(localAddr), + }) + defer closeHarness.stopAndAssert() + + // The remote party will send a ClosingSig message, but with the + // wrong local script. We should expect an error. + closeHarness.expectFailure(ErrWrongLocalScript) + + // We'll send this message in directly, as we shouldn't get any + // further in the process. + // assuming we start in this negotiation state. + localSigEvent := &LocalSigReceived{ + SigMsg: lnwire.ClosingSig{ + CloserScript: remoteAddr, + CloseeScript: remoteAddr, + ClosingSigs: lnwire.ClosingSigs{ + CloserAndClosee: newSigTlv[tlv.TlvType3]( //nolint:ll + remoteWireSig, + ), + }, + }, + } + closeHarness.chanCloser.SendEvent(ctx, localSigEvent) + }) + // In this test, we'll assert that we're able to restart the RBF loop // to trigger additional signature iterations. t.Run("send_offer_rbf_iteration_loop", func(t *testing.T) { firstState := &ClosingNegotiation{ PeerState: lntypes.Dual[AsymmetricPeerState]{ Local: &LocalCloseStart{ - CloseChannelTerms: *closeTerms, + CloseChannelTerms: closeTerms, }, }, + CloseChannelTerms: closeTerms, } closeHarness := newCloser(t, &harnessCfg{ @@ -1330,44 +1379,18 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { noDustExpect, ) - // Next, we'll send in a new SendShutdown event which simulates - // the user requesting a RBF fee bump. We'll use 10x the fee we - // used in the last iteration. + // Next, we'll send in a new SendOfferEvent event which + // simulates the user requesting a RBF fee bump. We'll use 10x + // the fee we used in the last iteration. rbfFeeBump := chainfee.FeePerKwFloor.FeePerVByte() * 10 - sendShutdown := &SendShutdown{ - IdealFeeRate: rbfFeeBump, + localOffer := &SendOfferEvent{ + TargetFeeRate: rbfFeeBump, } - // We should send shutdown as normal, but skip some other - // checks as we know the close is in progress. - closeHarness.expectShutdownEvents(shutdownExpect{ - allowSend: true, - finalBalances: fn.Some(closeTerms.ShutdownBalances), - recvShutdown: true, - }) - closeHarness.expectMsgSent( - singleMsgMatcher[*lnwire.Shutdown](nil), - ) - - closeHarness.chanCloser.SendEvent(ctx, sendShutdown) - - // We should first transition to the Channel Active state - // momentarily, before transitioning to the shutdown pending - // state. - closeHarness.assertStateTransitions( - &ChannelActive{}, &ShutdownPending{}, - ) - - // Next, we'll send in the shutdown received event, which - // should transition us to the channel flushing state. - shutdownEvent := &ShutdownReceived{ - ShutdownScript: remoteAddr, - } - - // Now we expect that aanother full RBF iteration takes place - // (we initiatea a new local sig). + // Now we expect that another full RBF iteration takes place (we + // initiate a new local sig). closeHarness.assertSingleRbfIteration( - shutdownEvent, balanceAfterClose, absoluteFee, + localOffer, balanceAfterClose, absoluteFee, noDustExpect, ) @@ -1403,12 +1426,13 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { startingState := &ClosingNegotiation{ PeerState: lntypes.Dual[AsymmetricPeerState]{ Local: &LocalCloseStart{ - CloseChannelTerms: *closeTerms, + CloseChannelTerms: closeTerms, }, Remote: &RemoteCloseStart{ - CloseChannelTerms: *closeTerms, + CloseChannelTerms: closeTerms, }, }, + CloseChannelTerms: closeTerms, } balanceAfterClose := remoteBalance.ToSatoshis() - absoluteFee @@ -1430,7 +1454,9 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { // be higher than the remote party's balance. feeOffer := &OfferReceivedEvent{ SigMsg: lnwire.ClosingComplete{ - FeeSatoshis: absoluteFee * 10, + CloserScript: remoteAddr, + CloseeScript: localAddr, + FeeSatoshis: absoluteFee * 10, }, } closeHarness.chanCloser.SendEvent(ctx, feeOffer) @@ -1449,12 +1475,13 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { firstState := &ClosingNegotiation{ PeerState: lntypes.Dual[AsymmetricPeerState]{ Local: &LocalCloseStart{ - CloseChannelTerms: closingTerms, + CloseChannelTerms: &closingTerms, }, Remote: &RemoteCloseStart{ - CloseChannelTerms: closingTerms, + CloseChannelTerms: &closingTerms, }, }, + CloseChannelTerms: &closingTerms, } closeHarness := newCloser(t, &harnessCfg{ @@ -1469,7 +1496,9 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { // includes our output. feeOffer := &OfferReceivedEvent{ SigMsg: lnwire.ClosingComplete{ - FeeSatoshis: absoluteFee, + FeeSatoshis: absoluteFee, + CloserScript: remoteAddr, + CloseeScript: localAddr, ClosingSigs: lnwire.ClosingSigs{ CloserAndClosee: newSigTlv[tlv.TlvType3]( //nolint:ll remoteWireSig, @@ -1498,7 +1527,9 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { // signature as it excludes an output. feeOffer := &OfferReceivedEvent{ SigMsg: lnwire.ClosingComplete{ - FeeSatoshis: absoluteFee, + FeeSatoshis: absoluteFee, + CloserScript: remoteAddr, + CloseeScript: localAddr, ClosingSigs: lnwire.ClosingSigs{ CloserNoClosee: newSigTlv[tlv.TlvType1]( //nolint:ll remoteWireSig, @@ -1516,8 +1547,8 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { // loops to enable the remote party to sign.new versions of the co-op // close transaction. t.Run("recv_offer_rbf_loop_iterations", func(t *testing.T) { - // We'll modify our s.t we're unable to pay for fees, but - // aren't yet dust. + // We'll modify our balance s.t we're unable to pay for fees, + // but aren't yet dust. closingTerms := *closeTerms closingTerms.ShutdownBalances.LocalBalance = lnwire.NewMSatFromSatoshis( //nolint:ll 9000, @@ -1526,12 +1557,13 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { firstState := &ClosingNegotiation{ PeerState: lntypes.Dual[AsymmetricPeerState]{ Local: &LocalCloseStart{ - CloseChannelTerms: closingTerms, + CloseChannelTerms: &closingTerms, }, Remote: &RemoteCloseStart{ - CloseChannelTerms: closingTerms, + CloseChannelTerms: &closingTerms, }, }, + CloseChannelTerms: &closingTerms, } closeHarness := newCloser(t, &harnessCfg{ @@ -1542,8 +1574,10 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { feeOffer := &OfferReceivedEvent{ SigMsg: lnwire.ClosingComplete{ - FeeSatoshis: absoluteFee, - LockTime: 1, + CloserScript: remoteAddr, + CloseeScript: localAddr, + FeeSatoshis: absoluteFee, + LockTime: 1, ClosingSigs: lnwire.ClosingSigs{ CloserAndClosee: newSigTlv[tlv.TlvType3]( //nolint:ll remoteWireSig, @@ -1560,31 +1594,9 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { false, ) - // At this point, we've completed a single RBF iteration, and - // want to test further iterations, so we'll use a shutdown - // even tot kick it all off. - // - // Before we send the shutdown messages below, we'll mark the - // balances as so we fast track to the negotiation state. - closeHarness.expectShutdownEvents(shutdownExpect{ - allowSend: true, - finalBalances: fn.Some(closingTerms.ShutdownBalances), - recvShutdown: true, - }) - closeHarness.expectMsgSent( - singleMsgMatcher[*lnwire.Shutdown](nil), - ) - - // We'll now simulate the start of the RBF loop, by receiving a - // new Shutdown message from the remote party. This signals - // that they want to obtain a new commit sig. - closeHarness.chanCloser.SendEvent( - ctx, &ShutdownReceived{ShutdownScript: remoteAddr}, - ) - - // Next, we'll receive an offer from the remote party, and - // drive another RBF iteration. This time, we'll increase the - // absolute fee by 1k sats. + // Next, we'll receive an offer from the remote party, and drive + // another RBF iteration. This time, we'll increase the absolute + // fee by 1k sats. feeOffer.SigMsg.FeeSatoshis += 1000 absoluteFee = feeOffer.SigMsg.FeeSatoshis closeHarness.assertSingleRemoteRbfIteration( @@ -1595,5 +1607,85 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { closeHarness.assertNoStateTransitions() }) - // TODO(roasbeef): cross sig case? tested isolation, so wolog? + t.Run("recv_offer_wrong_local_script", func(t *testing.T) { + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState](startingState), + }) + defer closeHarness.stopAndAssert() + + // The remote party will send a ClosingComplete message, but + // with the wrong local script. We should expect an error. + closeHarness.expectFailure(ErrWrongLocalScript) + + // We'll send our remote addr as the Closee script, which should + // trigger an error. + feeOffer := &OfferReceivedEvent{ + SigMsg: lnwire.ClosingComplete{ + FeeSatoshis: absoluteFee, + CloserScript: remoteAddr, + CloseeScript: remoteAddr, + ClosingSigs: lnwire.ClosingSigs{ + CloserNoClosee: newSigTlv[tlv.TlvType1]( //nolint:ll + remoteWireSig, + ), + }, + }, + } + closeHarness.chanCloser.SendEvent(ctx, feeOffer) + + // We shouldn't have transitioned to a new state. + closeHarness.assertNoStateTransitions() + }) + + t.Run("recv_offer_remote_addr_change", func(t *testing.T) { + closingTerms := *closeTerms + + firstState := &ClosingNegotiation{ + PeerState: lntypes.Dual[AsymmetricPeerState]{ + Local: &LocalCloseStart{ + CloseChannelTerms: &closingTerms, + }, + Remote: &RemoteCloseStart{ + CloseChannelTerms: &closingTerms, + }, + }, + CloseChannelTerms: &closingTerms, + } + + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState](firstState), + localUpfrontAddr: fn.Some(localAddr), + }) + defer closeHarness.stopAndAssert() + + // This time, the close request sent by the remote party will + // modify their normal remote address. This should cause us to + // recognize this, and counter sign the proper co-op close + // transaction. + newRemoteAddr := lnwire.DeliveryAddress(append( + []byte{txscript.OP_1, txscript.OP_DATA_32}, + bytes.Repeat([]byte{0x03}, 32)..., + )) + feeOffer := &OfferReceivedEvent{ + SigMsg: lnwire.ClosingComplete{ + CloserScript: newRemoteAddr, + CloseeScript: localAddr, + FeeSatoshis: absoluteFee, + LockTime: 1, + ClosingSigs: lnwire.ClosingSigs{ + CloserAndClosee: newSigTlv[tlv.TlvType3]( //nolint:ll + remoteWireSig, + ), + }, + }, + } + + // As we're already in the negotiation phase, we'll now trigger + // a new iteration by having the remote party send a new offer + // sig. + closeHarness.assertSingleRemoteRbfIteration( + feeOffer, balanceAfterClose, absoluteFee, sequence, + false, + ) + }) } diff --git a/lnwallet/chancloser/rbf_coop_transitions.go b/lnwallet/chancloser/rbf_coop_transitions.go index 01ab5c32f..452386825 100644 --- a/lnwallet/chancloser/rbf_coop_transitions.go +++ b/lnwallet/chancloser/rbf_coop_transitions.go @@ -1,6 +1,7 @@ package chancloser import ( + "bytes" "fmt" "github.com/btcsuite/btcd/btcec/v2" @@ -426,9 +427,6 @@ func (c *ChannelFlushing) ProcessEvent(event ProtocolEvent, env *Environment, c.EarlyRemoteOffer = fn.Some(*msg) - // TODO(roasbeef): unit test! - // * actually do this ^ - // We'll perform a noop update so we can wait for the actual // channel flushed event. return &CloseStateTransition{ @@ -469,8 +467,6 @@ func (c *ChannelFlushing) ProcessEvent(event ProtocolEvent, env *Environment, // We'll then use that fee rate to determine the absolute fee // we'd propose. - // - // TODO(roasbeef): need to sign the 3 diff versions of this? localTxOut, remoteTxOut := closeTerms.DeriveCloseTxOuts() absoluteFee := env.FeeEstimator.EstimateFee( env.ChanType, localTxOut, remoteTxOut, @@ -522,12 +518,13 @@ func (c *ChannelFlushing) ProcessEvent(event ProtocolEvent, env *Environment, NextState: &ClosingNegotiation{ PeerState: lntypes.Dual[AsymmetricPeerState]{ Local: &LocalCloseStart{ - CloseChannelTerms: closeTerms, + CloseChannelTerms: &closeTerms, }, Remote: &RemoteCloseStart{ - CloseChannelTerms: closeTerms, + CloseChannelTerms: &closeTerms, }, }, + CloseChannelTerms: &closeTerms, }, NewEvents: newEvents, }, nil @@ -571,6 +568,63 @@ func processNegotiateEvent(c *ClosingNegotiation, event ProtocolEvent, }, nil } +// updateAndValidateCloseTerms is a helper function that validates examines the +// incoming event, and decide if we need to update the remote party's address, +// or reject it if it doesn't include our latest address. +func (c *ClosingNegotiation) updateAndValidateCloseTerms(event ProtocolEvent, +) error { + + assertLocalScriptMatches := func(localScriptInMsg []byte) error { + if !bytes.Equal( + c.LocalDeliveryScript, localScriptInMsg, + ) { + + return fmt.Errorf("%w: remote party sent wrong "+ + "script, expected %x, got %x", + ErrWrongLocalScript, c.LocalDeliveryScript, + localScriptInMsg, + ) + } + + return nil + } + + switch msg := event.(type) { + // The remote party is sending us a new request to counter sign their + // version of the commitment transaction. + case *OfferReceivedEvent: + // Make sure that they're sending our local script, and not + // something else. + err := assertLocalScriptMatches(msg.SigMsg.CloseeScript) + if err != nil { + return err + } + + oldRemoteAddr := c.RemoteDeliveryScript + newRemoteAddr := msg.SigMsg.CloserScript + + // If they're sending a new script, then we'll update to the new + // one. + if !bytes.Equal(oldRemoteAddr, newRemoteAddr) { + c.RemoteDeliveryScript = newRemoteAddr + } + + // The remote party responded to our sig request with a signature for + // our version of the commitment transaction. + case *LocalSigReceived: + // Make sure that they're sending our local script, and not + // something else. + err := assertLocalScriptMatches(msg.SigMsg.CloserScript) + if err != nil { + return err + } + + return nil + } + + return nil +} + // ProcessEvent drives forward the composite states for the local and remote // party in response to new events. From this state, we'll continue to drive // forward the local and remote states until we arrive at the StateFin stage, @@ -597,22 +651,13 @@ func (c *ClosingNegotiation) ProcessEvent(event ProtocolEvent, env *Environment, ConfirmedTx: msg.Tx, }, }, nil + } - // Otherwise, if we receive a shutdown, or receive an event to send a - // shutdown, then we'll go back up to the ChannelActive state, and have - // it handle this event by emitting an internal event. - // - // TODO(roasbeef): both will have fee rate specified, so ok? - case *ShutdownReceived, *SendShutdown: - chancloserLog.Infof("ChannelPoint(%v): RBF case triggered, "+ - "restarting negotiation", env.ChanPoint) - - return &CloseStateTransition{ - NextState: &ChannelActive{}, - NewEvents: fn.Some(RbfEvent{ - InternalEvent: []ProtocolEvent{event}, - }), - }, nil + // At this point, we know its a new signature message. We'll validate, + // and maybe update the set of close terms based on what we receive. We + // might update the remote party's address for example. + if err := c.updateAndValidateCloseTerms(event); err != nil { + return nil, fmt.Errorf("event violates close terms: %w", err) } // If we get to this point, then we have an event that'll drive forward @@ -628,14 +673,14 @@ func (c *ClosingNegotiation) ProcessEvent(event ProtocolEvent, env *Environment, case c.PeerState.GetForParty(lntypes.Remote).ShouldRouteTo(event): chancloserLog.Infof("ChannelPoint(%v): routing %T to remote "+ - "chan state", env.ChanPoint, event) + "chan state", env.ChanPoint, event) // Drive forward the remote state based on the next event. return processNegotiateEvent(c, event, env, lntypes.Remote) } - return nil, fmt.Errorf("%w: received %T while in ClosingNegotiation", - ErrInvalidStateTransition, event) + return nil, fmt.Errorf("%w: received %T while in %v", + ErrInvalidStateTransition, event, c) } // newSigTlv is a helper function that returns a new optional TLV sig field for @@ -654,14 +699,34 @@ func (l *LocalCloseStart) ProcessEvent(event ProtocolEvent, env *Environment, // rate to generate for the closing transaction with our ideal fee // rate. case *SendOfferEvent: - // First, we'll figure out the absolute fee rate we should pay // given the state of the local/remote outputs. + // First, we'll figure out the absolute fee rate we should pay localTxOut, remoteTxOut := l.DeriveCloseTxOuts() absoluteFee := env.FeeEstimator.EstimateFee( env.ChanType, localTxOut, remoteTxOut, msg.TargetFeeRate.FeePerKWeight(), ) + // If we can't actually pay for fees here, then we'll just do a + // noop back to the same state to await a new fee rate. + if !l.LocalCanPayFees(absoluteFee) { + chancloserLog.Infof("ChannelPoint(%v): unable to pay "+ + "fee=%v with local balance %v, skipping "+ + "closing_complete", env.ChanPoint, absoluteFee, + l.LocalBalance) + + return &CloseStateTransition{ + NextState: &CloseErr{ + CloseChannelTerms: l.CloseChannelTerms, + Party: lntypes.Local, + ErrState: NewErrStateCantPayForFee( + l.LocalBalance.ToSatoshis(), + absoluteFee, + ), + }, + }, nil + } + // Now that we know what fee we want to pay, we'll create a new // signature over our co-op close transaction. For our // proposals, we'll just always use the known RBF sequence @@ -848,8 +913,10 @@ func (l *LocalOfferSent) ProcessEvent(event ProtocolEvent, env *Environment, return &CloseStateTransition{ NextState: &ClosePending{ - CloseTx: closeTx, - FeeRate: l.ProposedFeeRate, + CloseTx: closeTx, + FeeRate: l.ProposedFeeRate, + CloseChannelTerms: l.CloseChannelTerms, + Party: lntypes.Local, }, NewEvents: fn.Some(protofsm.EmittedEvent[ProtocolEvent]{ ExternalEvents: broadcastEvent, @@ -1022,8 +1089,10 @@ func (l *RemoteCloseStart) ProcessEvent(event ProtocolEvent, env *Environment, // the next state where we'll sign+broadcast the sig. return &CloseStateTransition{ NextState: &ClosePending{ - CloseTx: closeTx, - FeeRate: feeRate, + CloseTx: closeTx, + FeeRate: feeRate, + CloseChannelTerms: l.CloseChannelTerms, + Party: lntypes.Remote, }, NewEvents: fn.Some(protofsm.EmittedEvent[ProtocolEvent]{ ExternalEvents: daemonEvents, @@ -1051,6 +1120,32 @@ func (c *ClosePending) ProcessEvent(event ProtocolEvent, env *Environment, }, }, nil + // If we get a send offer event in this state, then we're doing a state + // transition to the LocalCloseStart state, so we can sign a new closing + // tx. + case *SendOfferEvent: + return &CloseStateTransition{ + NextState: &LocalCloseStart{ + CloseChannelTerms: c.CloseChannelTerms, + }, + NewEvents: fn.Some(protofsm.EmittedEvent[ProtocolEvent]{ + InternalEvent: []ProtocolEvent{msg}, + }), + }, nil + + // If we get an offer received event, then we're doing a state + // transition to the RemoteCloseStart, as the remote peer wants to sign + // a new closing tx. + case *OfferReceivedEvent: + return &CloseStateTransition{ + NextState: &RemoteCloseStart{ + CloseChannelTerms: c.CloseChannelTerms, + }, + NewEvents: fn.Some(protofsm.EmittedEvent[ProtocolEvent]{ + InternalEvent: []ProtocolEvent{msg}, + }), + }, nil + default: return &CloseStateTransition{ @@ -1068,3 +1163,44 @@ func (c *CloseFin) ProcessEvent(event ProtocolEvent, env *Environment, NextState: c, }, nil } + +// ProcessEvent is a semi-terminal state in the rbf-coop close state machine. +// In this state, we hit a validation error in an earlier state, so we'll remain +// in this state for the user to examine. We may also process new requests to +// continue the state machine. +func (c *CloseErr) ProcessEvent(event ProtocolEvent, env *Environment, +) (*CloseStateTransition, error) { + + switch msg := event.(type) { + // If we get a send offer event in this state, then we're doing a state + // transition to the LocalCloseStart state, so we can sign a new closing + // tx. + case *SendOfferEvent: + return &CloseStateTransition{ + NextState: &LocalCloseStart{ + CloseChannelTerms: c.CloseChannelTerms, + }, + NewEvents: fn.Some(protofsm.EmittedEvent[ProtocolEvent]{ + InternalEvent: []ProtocolEvent{msg}, + }), + }, nil + + // If we get an offer received event, then we're doing a state + // transition to the RemoteCloseStart, as the remote peer wants to sign + // a new closing tx. + case *OfferReceivedEvent: + return &CloseStateTransition{ + NextState: &RemoteCloseStart{ + CloseChannelTerms: c.CloseChannelTerms, + }, + NewEvents: fn.Some(protofsm.EmittedEvent[ProtocolEvent]{ + InternalEvent: []ProtocolEvent{msg}, + }), + }, nil + + default: + return &CloseStateTransition{ + NextState: c, + }, nil + } +} From 333492e65791b133ea4bab50afbea148cf277d0a Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Fri, 7 Feb 2025 18:22:15 -0800 Subject: [PATCH 20/48] lnwallet: implement special case for OP_RETURN in rbf-coop In this commit, we implement a special case for OP_RETURN scripts outlined in the spec. If a party decides that its output will be too small even after the dust check, then they can opt to set it to zero by sending an `OP_RETURN` as their script. --- lnwallet/channel.go | 22 ++++++++++--- lnwallet/channel_test.go | 67 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 85 insertions(+), 4 deletions(-) diff --git a/lnwallet/channel.go b/lnwallet/channel.go index aa8e21e76..d7489f942 100644 --- a/lnwallet/channel.go +++ b/lnwallet/channel.go @@ -9269,13 +9269,19 @@ func CreateCooperativeCloseTx(fundingTxIn wire.TxIn, closeTx.LockTime = lockTime }) - // TODO(roasbeef): needs support for dropping inputs - - // Create both cooperative closure outputs, properly respecting the - // dust limits of both parties. + // Create both cooperative closure outputs, properly respecting the dust + // limits of both parties. var localOutputIdx fn.Option[int] haveLocalOutput := ourBalance >= localDust if haveLocalOutput { + // If our script is an OP_RETURN, then we set our balance to + // zero. + if opts.customSequence.IsSome() && + input.ScriptIsOpReturn(ourDeliveryScript) { + + ourBalance = 0 + } + closeTx.AddTxOut(&wire.TxOut{ PkScript: ourDeliveryScript, Value: int64(ourBalance), @@ -9287,6 +9293,14 @@ func CreateCooperativeCloseTx(fundingTxIn wire.TxIn, var remoteOutputIdx fn.Option[int] haveRemoteOutput := theirBalance >= remoteDust if haveRemoteOutput { + // If a party's script is an OP_RETURN, then we set their + // balance to zero. + if opts.customSequence.IsSome() && + input.ScriptIsOpReturn(theirDeliveryScript) { + + theirBalance = 0 + } + closeTx.AddTxOut(&wire.TxOut{ PkScript: theirDeliveryScript, Value: int64(theirBalance), diff --git a/lnwallet/channel_test.go b/lnwallet/channel_test.go index 9da174a3d..0a0ca261c 100644 --- a/lnwallet/channel_test.go +++ b/lnwallet/channel_test.go @@ -20,6 +20,7 @@ import ( "github.com/btcsuite/btcd/btcutil" "github.com/btcsuite/btcd/btcutil/txsort" "github.com/btcsuite/btcd/chaincfg/chainhash" + "github.com/btcsuite/btcd/mempool" "github.com/btcsuite/btcd/txscript" "github.com/btcsuite/btcd/wire" "github.com/davecgh/go-spew/spew" @@ -2450,6 +2451,72 @@ func TestCooperativeCloseDustAdherence(t *testing.T) { } } +// TestCooperativeCloseOpReturn tests that if either party's script is an +// OP_RETURN script, then we'll set their output value as zero on the closing +// transaction. +func TestCooperativeCloseOpReturn(t *testing.T) { + t.Parallel() + + // Create a test channel which will be used for the duration of this + // unittest. The channel will be funded evenly with Alice having 5 BTC, + // and Bob having 5 BTC. + aliceChannel, bobChannel, err := CreateTestChannels( + t, channeldb.SingleFunderTweaklessBit, + ) + require.NoError(t, err, "unable to create test channels") + + // Alice will have a "normal" looking script, while Bob will have a + // script that's just an OP_RETURN. + aliceDeliveryScript := bobsPrivKey + bobDeliveryScript := []byte{txscript.OP_RETURN} + + aliceFeeRate := chainfee.SatPerKWeight( + aliceChannel.channelState.LocalCommitment.FeePerKw, + ) + aliceFee := aliceChannel.CalcFee(aliceFeeRate) + 1000 + + assertBobOpReturn := func(tx *wire.MsgTx) { + // We should still have two outputs on the commitment + // transaction, as Alice's is non-dust. + require.Len(t, tx.TxOut, 2) + + // We should find that Bob's output has a zero value. + bobTxOut := fn.Filter(tx.TxOut, func(txOut *wire.TxOut) bool { + return bytes.Equal(txOut.PkScript, bobDeliveryScript) + }) + require.Len(t, bobTxOut, 1) + + require.True(t, bobTxOut[0].Value == 0) + } + + // Next, we'll make a new co-op close proposal, initiated by Alice. + aliceSig, closeTxAlice, _, err := aliceChannel.CreateCloseProposal( + aliceFee, aliceDeliveryScript, bobDeliveryScript, + // We use a custom sequence as this rule only applies to the RBF + // coop channel type. + WithCustomSequence(mempool.MaxRBFSequence), + ) + require.NoError(t, err, "unable to close channel") + + assertBobOpReturn(closeTxAlice) + + bobSig, _, _, err := bobChannel.CreateCloseProposal( + aliceFee, bobDeliveryScript, aliceDeliveryScript, + WithCustomSequence(mempool.MaxRBFSequence), + ) + require.NoError(t, err, "unable to close channel") + + // We should now be able to complete the cooperative channel closure, + // finding that the close tx still only has a single output. + closeTx, _, err := bobChannel.CompleteCooperativeClose( + bobSig, aliceSig, bobDeliveryScript, aliceDeliveryScript, + aliceFee, WithCustomSequence(mempool.MaxRBFSequence), + ) + require.NoError(t, err, "unable to accept channel close") + + assertBobOpReturn(closeTx) +} + // TestUpdateFeeAdjustments tests that the state machine is able to properly // accept valid fee changes, as well as reject any invalid fee updates. func TestUpdateFeeAdjustments(t *testing.T) { From 7370617aaaa519ccb04ee544fe736ad4056fd295 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 26 Feb 2025 18:04:16 -0800 Subject: [PATCH 21/48] lnwallet/chancloser: update RBF state machine to handle early offer case In this commit, we update the RBF state machine to handle early offer cases. This can happen if after we send out shutdown (to kick things off), the remote party sends their offer early. This can also happen if their outgoing shutdown (to ACK ours) was delayed for w/e reason, and we get their offer first. The alternative was to modify the state machine itself, but we feel that handling this early case is better in line with the Robustness principle. --- lnwallet/chancloser/rbf_coop_states.go | 5 ++ lnwallet/chancloser/rbf_coop_test.go | 97 +++++++++++++++++++++ lnwallet/chancloser/rbf_coop_transitions.go | 60 ++++++++++--- 3 files changed, 149 insertions(+), 13 deletions(-) diff --git a/lnwallet/chancloser/rbf_coop_states.go b/lnwallet/chancloser/rbf_coop_states.go index 3850abfc9..a195334f2 100644 --- a/lnwallet/chancloser/rbf_coop_states.go +++ b/lnwallet/chancloser/rbf_coop_states.go @@ -454,6 +454,11 @@ type ShutdownPending struct { // IdealFeeRate is the ideal fee rate we'd like to use for the closing // attempt. IdealFeeRate fn.Option[chainfee.SatPerVByte] + + // EarlyRemoteOffer is the offer we received from the remote party + // before we received their shutdown message. We'll stash it to process + // later. + EarlyRemoteOffer fn.Option[OfferReceivedEvent] } // String returns the name of the state for ShutdownPending. diff --git a/lnwallet/chancloser/rbf_coop_test.go b/lnwallet/chancloser/rbf_coop_test.go index 7456025c3..198f1121a 100644 --- a/lnwallet/chancloser/rbf_coop_test.go +++ b/lnwallet/chancloser/rbf_coop_test.go @@ -251,6 +251,8 @@ func (r *rbfCloserTestHarness) assertNoStateTransitions() { } func (r *rbfCloserTestHarness) assertStateTransitions(states ...RbfState) { + r.T.Helper() + assertStateTransitions(r.T, r.stateSub, states) } @@ -1035,6 +1037,101 @@ func TestRbfShutdownPendingTransitions(t *testing.T) { closeHarness.assertStateTransitions(&ChannelFlushing{}) }) + // If we an early offer from the remote party, then we should stash + // that, transition to the channel flushing state. Once there, another + // self transition should emit the stashed offer. + t.Run("early_remote_offer_shutdown_complete", func(t *testing.T) { + firstState := *startingState + firstState.IdealFeeRate = fn.Some( + chainfee.FeePerKwFloor.FeePerVByte(), + ) + firstState.ShutdownScripts = ShutdownScripts{ + LocalDeliveryScript: localAddr, + RemoteDeliveryScript: remoteAddr, + } + + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState]( + &firstState, + ), + }) + defer closeHarness.stopAndAssert() + + // In this case we're doing the shutdown dance for the first + // time, so we'll mark the channel as not being flushed. + closeHarness.expectFinalBalances(fn.None[ShutdownBalances]()) + + // Before we send the shutdown complete event, we'll send in an + // early offer from the remote party. + closeHarness.chanCloser.SendEvent(ctx, &OfferReceivedEvent{}) + + // This will cause a self transition back to ShutdownPending. + closeHarness.assertStateTransitions(&ShutdownPending{}) + + // Next, we'll send in a shutdown complete event. + closeHarness.chanCloser.SendEvent(ctx, &ShutdownComplete{}) + + // We should transition to the channel flushing state, then the + // self event to have this state cache he early offer should + // follow. + closeHarness.assertStateTransitions( + &ChannelFlushing{}, &ChannelFlushing{}, + ) + + // If we get the current state, we should see that the offer is + // cached. + currentState := assertStateT[*ChannelFlushing](closeHarness) + require.NotNil(t, currentState.EarlyRemoteOffer) + }) + + // If we an early offer from the remote party, then we should stash + // that, transition to the channel flushing state. Once there, another + // self transition should emit the stashed offer. + t.Run("early_remote_offer_shutdown_received", func(t *testing.T) { + firstState := *startingState + firstState.IdealFeeRate = fn.Some( + chainfee.FeePerKwFloor.FeePerVByte(), + ) + firstState.ShutdownScripts = ShutdownScripts{ + LocalDeliveryScript: localAddr, + RemoteDeliveryScript: remoteAddr, + } + + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState]( + &firstState, + ), + }) + defer closeHarness.stopAndAssert() + + // In this case we're doing the shutdown dance for the first + // time, so we'll mark the channel as not being flushed. + closeHarness.expectFinalBalances(fn.None[ShutdownBalances]()) + closeHarness.expectIncomingAddsDisabled() + + // Before we send the shutdown complete event, we'll send in an + // early offer from the remote party. + closeHarness.chanCloser.SendEvent(ctx, &OfferReceivedEvent{}) + + // This will cause a self transition back to ShutdownPending. + closeHarness.assertStateTransitions(&ShutdownPending{}) + + // Next, we'll send in a shutdown complete event. + closeHarness.chanCloser.SendEvent(ctx, &ShutdownReceived{}) + + // We should transition to the channel flushing state, then the + // self event to have this state cache he early offer should + // follow. + closeHarness.assertStateTransitions( + &ChannelFlushing{}, &ChannelFlushing{}, + ) + + // If we get the current state, we should see that the offer is + // cached. + currentState := assertStateT[*ChannelFlushing](closeHarness) + require.NotNil(t, currentState.EarlyRemoteOffer) + }) + // Any other event should be ignored. assertUnknownEventFail(t, startingState) } diff --git a/lnwallet/chancloser/rbf_coop_transitions.go b/lnwallet/chancloser/rbf_coop_transitions.go index 452386825..b83e0b752 100644 --- a/lnwallet/chancloser/rbf_coop_transitions.go +++ b/lnwallet/chancloser/rbf_coop_transitions.go @@ -291,6 +291,22 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, }, }, nil + // The remote party sent an offer early. We'll go to the ChannelFlushing + // case, and then emit the offer as a internal event, which'll be + // handled as an early offer. + case *OfferReceivedEvent: + chancloserLog.Infof("ChannelPoint(%v): got an early offer "+ + "in ShutdownPending, emitting as external event", + env.ChanPoint) + + s.EarlyRemoteOffer = fn.Some(*msg) + + // We'll perform a noop update so we can wait for the actual + // channel flushed event. + return &CloseStateTransition{ + NextState: s, + }, nil + // When we receive a shutdown from the remote party, we'll validate the // shutdown message, then transition to the ChannelFlushing state. case *ShutdownReceived: @@ -314,7 +330,7 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, // If the channel is *already* flushed, and the close is // go straight into negotiation, as this is the RBF loop. // already in progress, then we can skip the flushing state and - var eventsToEmit fn.Option[protofsm.EmittedEvent[ProtocolEvent]] + var eventsToEmit []ProtocolEvent finalBalances := env.ChanObserver.FinalBalances().UnwrapOr( unknownBalance, ) @@ -322,11 +338,7 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, channelFlushed := ProtocolEvent(&ChannelFlushed{ ShutdownBalances: finalBalances, }) - eventsToEmit = fn.Some(RbfEvent{ - InternalEvent: []ProtocolEvent{ - channelFlushed, - }, - }) + eventsToEmit = append(eventsToEmit, channelFlushed) } chancloserLog.Infof("ChannelPoint(%v): disabling incoming adds", @@ -342,6 +354,19 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, chancloserLog.Infof("ChannelPoint(%v): waiting for channel to "+ "be flushed...", env.ChanPoint) + // If we received a remote offer early from the remote party, + // then we'll add that to the set of internal events to emit. + s.EarlyRemoteOffer.WhenSome(func(offer OfferReceivedEvent) { + eventsToEmit = append(eventsToEmit, &offer) + }) + + var newEvents fn.Option[RbfEvent] + if len(eventsToEmit) > 0 { + newEvents = fn.Some(RbfEvent{ + InternalEvent: eventsToEmit, + }) + } + // We transition to the ChannelFlushing state, where we await // the ChannelFlushed event. return &CloseStateTransition{ @@ -352,7 +377,7 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, RemoteDeliveryScript: msg.ShutdownScript, //nolint:ll }, }, - NewEvents: eventsToEmit, + NewEvents: newEvents, }, nil // If we get this message, then this means that we were finally able to @@ -365,7 +390,7 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, // If the channel is *already* flushed, and the close is // already in progress, then we can skip the flushing state and // go straight into negotiation, as this is the RBF loop. - var eventsToEmit fn.Option[protofsm.EmittedEvent[ProtocolEvent]] + var eventsToEmit []ProtocolEvent finalBalances := env.ChanObserver.FinalBalances().UnwrapOr( unknownBalance, ) @@ -373,10 +398,19 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, channelFlushed := ProtocolEvent(&ChannelFlushed{ ShutdownBalances: finalBalances, }) - eventsToEmit = fn.Some(RbfEvent{ - InternalEvent: []ProtocolEvent{ - channelFlushed, - }, + eventsToEmit = append(eventsToEmit, channelFlushed) + } + + // If we received a remote offer early from the remote party, + // then we'll add that to the set of internal events to emit. + s.EarlyRemoteOffer.WhenSome(func(offer OfferReceivedEvent) { + eventsToEmit = append(eventsToEmit, &offer) + }) + + var newEvents fn.Option[RbfEvent] + if len(eventsToEmit) > 0 { + newEvents = fn.Some(RbfEvent{ + InternalEvent: eventsToEmit, }) } @@ -387,7 +421,7 @@ func (s *ShutdownPending) ProcessEvent(event ProtocolEvent, env *Environment, IdealFeeRate: s.IdealFeeRate, ShutdownScripts: s.ShutdownScripts, }, - NewEvents: eventsToEmit, + NewEvents: newEvents, }, nil // Any other messages in this state will result in an error, as this is From 84b6d95b918edef1baa374edc895829edfe2ebcd Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 26 Feb 2025 19:04:18 -0800 Subject: [PATCH 22/48] lnwallet/chancloser: increase test coverage of state machine --- lnwallet/chancloser/rbf_coop_test.go | 290 +++++++++++++++++++- lnwallet/chancloser/rbf_coop_transitions.go | 25 +- 2 files changed, 302 insertions(+), 13 deletions(-) diff --git a/lnwallet/chancloser/rbf_coop_test.go b/lnwallet/chancloser/rbf_coop_test.go index 198f1121a..33da8b2c3 100644 --- a/lnwallet/chancloser/rbf_coop_test.go +++ b/lnwallet/chancloser/rbf_coop_test.go @@ -157,6 +157,27 @@ func assertUnknownEventFail(t *testing.T, startingState ProtocolState) { }) } +// assertSpendEventCloseFin asserts that the state machine transitions to the +// CloseFin state when a spend event is received. +func assertSpendEventCloseFin(t *testing.T, startingState ProtocolState) { + t.Helper() + + // If a spend event is received, the state machine should transition to + // the CloseFin state. + t.Run("spend_event", func(t *testing.T) { + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some(startingState), + }) + defer closeHarness.stopAndAssert() + + closeHarness.chanCloser.SendEvent( + context.Background(), &SpendEvent{}, + ) + + closeHarness.assertStateTransitions(&CloseFin{}) + }) +} + type harnessCfg struct { initialState fn.Option[ProtocolState] @@ -628,7 +649,8 @@ func (r *rbfCloserTestHarness) assertSingleRbfIteration( func (r *rbfCloserTestHarness) assertSingleRemoteRbfIteration( initEvent *OfferReceivedEvent, balanceAfterClose, - absoluteFee btcutil.Amount, sequence uint32, iteration bool) { + absoluteFee btcutil.Amount, sequence uint32, iteration bool, + sendInit bool) { ctx := context.Background() @@ -640,7 +662,9 @@ func (r *rbfCloserTestHarness) assertSingleRemoteRbfIteration( absoluteFee, balanceAfterClose, false, ) - r.chanCloser.SendEvent(ctx, initEvent) + if sendInit { + r.chanCloser.SendEvent(ctx, initEvent) + } // Our outer state should transition to ClosingNegotiation state. r.assertStateTransitions(&ClosingNegotiation{}) @@ -862,7 +886,28 @@ func TestRbfChannelActiveTransitions(t *testing.T) { closeHarness.waitForMsgSent() }) - // TODO(roasbeef): thaw height fail + // If the remote party attempts to close, and a thaw height is active, + // but not yet met, then we should fail. + t.Run("remote_initiated_thaw_height_close_fail", func(t *testing.T) { + closeHarness := newCloser(t, &harnessCfg{ + localUpfrontAddr: fn.Some(localAddr), + thawHeight: fn.Some(uint32(100000)), + }) + defer closeHarness.stopAndAssert() + + // Next, we'll emit the recv event, with the addr of the remote + // party. + closeHarness.chanCloser.SendEvent( + ctx, &ShutdownReceived{ + ShutdownScript: remoteAddr, + BlockHeight: 1, + }, + ) + + // We expect a failure as the block height is less than the + // start height. + closeHarness.expectFailure(ErrThawHeightNotReached) + }) // When we receive a shutdown, we should transition to the shutdown // pending state, with the local+remote shutdown addrs known. @@ -906,6 +951,9 @@ func TestRbfChannelActiveTransitions(t *testing.T) { // Any other event should be ignored. assertUnknownEventFail(t, &ChannelActive{}) + + // Sending a Spend event should transition to CloseFin. + assertSpendEventCloseFin(t, &ChannelActive{}) } // TestRbfShutdownPendingTransitions tests the transitions of the RBF closer @@ -1134,6 +1182,9 @@ func TestRbfShutdownPendingTransitions(t *testing.T) { // Any other event should be ignored. assertUnknownEventFail(t, startingState) + + // Sending a Spend event should transition to CloseFin. + assertSpendEventCloseFin(t, startingState) } // TestRbfChannelFlushingTransitions tests the transitions of the RBF closer @@ -1241,7 +1292,7 @@ func TestRbfChannelFlushingTransitions(t *testing.T) { closeHarness.expectChanPendingClose() } - // From where, we expect the state transition to go + // From here, we expect the state transition to go // back to closing negotiated, for a ClosingComplete // message to be sent and then for us to terminate at // that state. This is 1/2 of the normal RBF signer @@ -1253,8 +1304,65 @@ func TestRbfChannelFlushingTransitions(t *testing.T) { }) } + // This tests that if we receive an `OfferReceivedEvent` while in the + // flushing state, then we'll cache that, and once we receive + // ChannelFlushed, we'll emit an internal `OfferReceivedEvent` in the + // negotiation state. + t.Run("early_offer", func(t *testing.T) { + firstState := *startingState + + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState]( + &firstState, + ), + }) + defer closeHarness.stopAndAssert() + + flushEvent := *flushTemplate + + // Set up the fee estimate s.t the local party doesn't have + // balance to close. + closeHarness.expectFeeEstimate(absoluteFee, 1) + + // First, we'll emit an `OfferReceivedEvent` to simulate an + // early offer (async network, they determine the channel is + // "flushed" before we do, and send their offer over). + remoteOffer := &OfferReceivedEvent{ + SigMsg: lnwire.ClosingComplete{ + FeeSatoshis: absoluteFee, + CloserScript: remoteAddr, + CloseeScript: localAddr, + ClosingSigs: lnwire.ClosingSigs{ + CloserAndClosee: newSigTlv[tlv.TlvType3]( //nolint:ll + remoteWireSig, + ), + }, + }, + } + + closeHarness.chanCloser.SendEvent(ctx, remoteOffer) + + // We should do a self transition, and still be in the + // ChannelFlushing state. + closeHarness.assertStateTransitions(&ChannelFlushing{}) + + sequence := uint32(mempool.MaxRBFSequence) + + // Now we'll send in the channel flushed event, and assert that + // this triggers a remote RBF iteration (we process their early + // offer and send our sig). + closeHarness.chanCloser.SendEvent(ctx, &flushEvent) + closeHarness.assertSingleRemoteRbfIteration( + remoteOffer, absoluteFee, absoluteFee, sequence, false, + true, + ) + }) + // Any other event should be ignored. assertUnknownEventFail(t, startingState) + + // Sending a Spend event should transition to CloseFin. + assertSpendEventCloseFin(t, startingState) } // TestRbfCloseClosingNegotiationLocal tests the local portion of the primary @@ -1496,6 +1604,59 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { &ClosingNegotiation{}, ) }) + + // Make sure that we'll go to the error state if we try to try a close + // that we can't pay for. + t.Run("send_offer_cannot_pay_for_fees", func(t *testing.T) { + firstState := &ClosingNegotiation{ + PeerState: lntypes.Dual[AsymmetricPeerState]{ + Local: &LocalCloseStart{ + CloseChannelTerms: closeTerms, + }, + }, + CloseChannelTerms: closeTerms, + } + + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState](firstState), + localUpfrontAddr: fn.Some(localAddr), + }) + defer closeHarness.stopAndAssert() + + // We'll prep to return an absolute fee that's much higher than + // the amount we have in the channel. + closeHarness.expectFeeEstimate(btcutil.SatoshiPerBitcoin, 1) + + rbfFeeBump := chainfee.FeePerKwFloor.FeePerVByte() + localOffer := &SendOfferEvent{ + TargetFeeRate: rbfFeeBump, + } + + // Next, we'll send in this event, which should fail as we can't + // actually pay for fees. + closeHarness.chanCloser.SendEvent(ctx, localOffer) + + // We should transition to the CloseErr (within + // ClosingNegotiation) state. + closeHarness.assertStateTransitions(&ClosingNegotiation{}) + + // If we get the state, we should see the expected ErrState. + currentState := assertStateT[*ClosingNegotiation](closeHarness) + + closeErrState, ok := currentState.PeerState.GetForParty( + lntypes.Local, + ).(*CloseErr) + require.True(t, ok) + require.IsType( + t, &ErrStateCantPayForFee{}, closeErrState.ErrState, + ) + }) + + // Any other event should be ignored. + assertUnknownEventFail(t, startingState) + + // Sending a Spend event should transition to CloseFin. + assertSpendEventCloseFin(t, startingState) } // TestRbfCloseClosingNegotiationRemote tests that state machine is able to @@ -1503,6 +1664,7 @@ func TestRbfCloseClosingNegotiationLocal(t *testing.T) { // party. func TestRbfCloseClosingNegotiationRemote(t *testing.T) { t.Parallel() + ctx := context.Background() localBalance := lnwire.NewMSatFromSatoshis(40_000) @@ -1533,7 +1695,6 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { } balanceAfterClose := remoteBalance.ToSatoshis() - absoluteFee - sequence := uint32(mempool.MaxRBFSequence) // This case tests that if we receive a signature from the remote @@ -1688,7 +1849,7 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { // sig. closeHarness.assertSingleRemoteRbfIteration( feeOffer, balanceAfterClose, absoluteFee, sequence, - false, + false, true, ) // Next, we'll receive an offer from the remote party, and drive @@ -1698,12 +1859,14 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { absoluteFee = feeOffer.SigMsg.FeeSatoshis closeHarness.assertSingleRemoteRbfIteration( feeOffer, balanceAfterClose, absoluteFee, sequence, - true, + true, true, ) closeHarness.assertNoStateTransitions() }) + // This tests that if we get an offer that has the wrong local script, + // then we'll emit a hard error. t.Run("recv_offer_wrong_local_script", func(t *testing.T) { closeHarness := newCloser(t, &harnessCfg{ initialState: fn.Some[ProtocolState](startingState), @@ -1734,6 +1897,9 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { closeHarness.assertNoStateTransitions() }) + // If we receive an offer from the remote party with a different remote + // script, then this ensures that we'll process that and use that create + // the next offer. t.Run("recv_offer_remote_addr_change", func(t *testing.T) { closingTerms := *closeTerms @@ -1782,7 +1948,115 @@ func TestRbfCloseClosingNegotiationRemote(t *testing.T) { // sig. closeHarness.assertSingleRemoteRbfIteration( feeOffer, balanceAfterClose, absoluteFee, sequence, - false, + false, true, ) }) + + // Any other event should be ignored. + assertUnknownEventFail(t, startingState) + + // Sending a Spend event should transition to CloseFin. + assertSpendEventCloseFin(t, startingState) +} + +// TestRbfCloseErr tests that the state machine is able to properly restart +// the state machine if we encounter an error. +func TestRbfCloseErr(t *testing.T) { + localBalance := lnwire.NewMSatFromSatoshis(40_000) + remoteBalance := lnwire.NewMSatFromSatoshis(50_000) + + closeTerms := &CloseChannelTerms{ + ShutdownBalances: ShutdownBalances{ + LocalBalance: localBalance, + RemoteBalance: remoteBalance, + }, + ShutdownScripts: ShutdownScripts{ + LocalDeliveryScript: localAddr, + RemoteDeliveryScript: remoteAddr, + }, + } + startingState := &ClosingNegotiation{ + PeerState: lntypes.Dual[AsymmetricPeerState]{ + Local: &CloseErr{ + CloseChannelTerms: closeTerms, + }, + }, + CloseChannelTerms: closeTerms, + } + + absoluteFee := btcutil.Amount(10_100) + balanceAfterClose := localBalance.ToSatoshis() - absoluteFee + + // From the error state, we should be able to kick off a new iteration + // for a local fee bump. + t.Run("send_offer_restart", func(t *testing.T) { + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState](startingState), + }) + defer closeHarness.stopAndAssert() + + rbfFeeBump := chainfee.FeePerKwFloor.FeePerVByte() + localOffer := &SendOfferEvent{ + TargetFeeRate: rbfFeeBump, + } + + // Now we expect that another full RBF iteration takes place (we + // initiate a new local sig). + closeHarness.assertSingleRbfIteration( + localOffer, balanceAfterClose, absoluteFee, + noDustExpect, + ) + + // We should terminate in the negotiation state. + closeHarness.assertStateTransitions( + &ClosingNegotiation{}, + ) + }) + + // From the error state, we should be able to handle the remote party + // kicking off a new iteration for a fee bump. + t.Run("recv_offer_restart", func(t *testing.T) { + startingState := &ClosingNegotiation{ + PeerState: lntypes.Dual[AsymmetricPeerState]{ + Remote: &CloseErr{ + CloseChannelTerms: closeTerms, + Party: lntypes.Remote, + }, + }, + CloseChannelTerms: closeTerms, + } + + closeHarness := newCloser(t, &harnessCfg{ + initialState: fn.Some[ProtocolState](startingState), + localUpfrontAddr: fn.Some(localAddr), + }) + defer closeHarness.stopAndAssert() + + feeOffer := &OfferReceivedEvent{ + SigMsg: lnwire.ClosingComplete{ + CloserScript: remoteAddr, + CloseeScript: localAddr, + FeeSatoshis: absoluteFee, + LockTime: 1, + ClosingSigs: lnwire.ClosingSigs{ + CloserAndClosee: newSigTlv[tlv.TlvType3]( //nolint:ll + remoteWireSig, + ), + }, + }, + } + + sequence := uint32(mempool.MaxRBFSequence) + + // As we're already in the negotiation phase, we'll now trigger + // a new iteration by having the remote party send a new offer + // sig. + closeHarness.assertSingleRemoteRbfIteration( + feeOffer, balanceAfterClose, absoluteFee, sequence, + false, true, + ) + }) + + // Sending a Spend event should transition to CloseFin. + assertSpendEventCloseFin(t, startingState) } diff --git a/lnwallet/chancloser/rbf_coop_transitions.go b/lnwallet/chancloser/rbf_coop_transitions.go index b83e0b752..3ddd591ad 100644 --- a/lnwallet/chancloser/rbf_coop_transitions.go +++ b/lnwallet/chancloser/rbf_coop_transitions.go @@ -22,6 +22,12 @@ import ( "github.com/lightningnetwork/lnd/tlv" ) +var ( + // ErrInvalidStateTransition is returned if the remote party tries to + // close, but the thaw height hasn't been matched yet. + ErrThawHeightNotReached = fmt.Errorf("thaw height not reached") +) + // sendShutdownEvents is a helper function that returns a set of daemon events // we need to emit when we decide that we should send a shutdown message. We'll // also mark the channel as borked as well, as at this point, we no longer want @@ -107,11 +113,11 @@ func validateShutdown(chanThawHeight fn.Option[uint32], // reject the shutdown message as we can't yet co-op close the // channel. if msg.BlockHeight < thawHeight { - return fmt.Errorf("initiator attempting to "+ + return fmt.Errorf("%w: initiator attempting to "+ "co-op close frozen ChannelPoint(%v) "+ "(current_height=%v, thaw_height=%v)", - chanPoint, msg.BlockHeight, - thawHeight) + ErrThawHeightNotReached, chanPoint, + msg.BlockHeight, thawHeight) } return nil @@ -694,18 +700,27 @@ func (c *ClosingNegotiation) ProcessEvent(event ProtocolEvent, env *Environment, return nil, fmt.Errorf("event violates close terms: %w", err) } + shouldRouteTo := func(party lntypes.ChannelParty) bool { + state := c.PeerState.GetForParty(party) + if state == nil { + return false + } + + return state.ShouldRouteTo(event) + } + // If we get to this point, then we have an event that'll drive forward // the negotiation process. Based on the event, we'll figure out which // state we'll be modifying. switch { - case c.PeerState.GetForParty(lntypes.Local).ShouldRouteTo(event): + case shouldRouteTo(lntypes.Local): chancloserLog.Infof("ChannelPoint(%v): routing %T to local "+ "chan state", env.ChanPoint, event) // Drive forward the local state based on the next event. return processNegotiateEvent(c, event, env, lntypes.Local) - case c.PeerState.GetForParty(lntypes.Remote).ShouldRouteTo(event): + case shouldRouteTo(lntypes.Remote): chancloserLog.Infof("ChannelPoint(%v): routing %T to remote "+ "chan state", env.ChanPoint, event) From fd05199ff28d7c60280ecfc19c501555a88016c0 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 4 Mar 2025 18:12:41 -0800 Subject: [PATCH 23/48] protofsm: add an upfront check for SendWhen predicates In this commit, we add an upfront check for `SendWhen` predicates before deciding to launch a goroutine. This ensures that when a message comes along that is already ready to send, we do the send in a synchronous manner. --- protofsm/state_machine.go | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/protofsm/state_machine.go b/protofsm/state_machine.go index 4d0215b69..c759d061a 100644 --- a/protofsm/state_machine.go +++ b/protofsm/state_machine.go @@ -377,9 +377,18 @@ func (s *StateMachine[Event, Env]) executeDaemonEvent(ctx context.Context, }) } - // If this doesn't have a SendWhen predicate, then we can just - // send it off right away. - if !daemonEvent.SendWhen.IsSome() { + canSend := func() bool { + return fn.MapOptionZ( + daemonEvent.SendWhen, + func(pred SendPredicate) bool { + return pred() + }, + ) + } + + // If this doesn't have a SendWhen predicate, or if it's already + // true, then we can just send it off right away. + if !daemonEvent.SendWhen.IsSome() || canSend() { return sendAndCleanUp() } @@ -397,14 +406,7 @@ func (s *StateMachine[Event, Env]) executeDaemonEvent(ctx context.Context, for { select { case <-predicateTicker.C: - canSend := fn.MapOptionZ( - daemonEvent.SendWhen, - func(pred SendPredicate) bool { - return pred() - }, - ) - - if canSend { + if canSend() { s.log.InfoS(ctx, "Send active predicate") err := sendAndCleanUp() From 047d3532f9d4f35891dcc264a8b4897c183da6a9 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 30 Jan 2024 18:01:20 -0800 Subject: [PATCH 24/48] peer: move existing chan closer init logic to new method In the next commit, we'll start checking feature bits to decide how to init the chan closer. In the future, we can move the current chan closer handling logic into an `MsgEndpoint`, which'll allow us to get rid of the explicit chan closer map and direct handling. --- peer/brontide.go | 150 ++++++++++++++++++++++-------------------- peer/brontide_test.go | 6 +- 2 files changed, 84 insertions(+), 72 deletions(-) diff --git a/peer/brontide.go b/peer/brontide.go index 4e99923d7..08fe9a27d 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -3313,6 +3313,85 @@ func (p *Brontide) createChanCloser(channel *lnwallet.LightningChannel, return chanCloser, nil } +// initNegotiateChanCloser initializes the channel closer for a channel that is +// using the original "negotiation" based protocol. +// +// TODO(roasbeef): can make a MsgEndpoint for existing handling logic to +// further abstract. +func (p *Brontide) initNegotiateChanCloser(req *htlcswitch.ChanClose, + channel *lnwallet.LightningChannel) error { + + // First, we'll choose a delivery address that we'll use to send the + // funds to in the case of a successful negotiation. + + // An upfront shutdown and user provided script are both optional, but + // must be equal if both set (because we cannot serve a request to + // close out to a script which violates upfront shutdown). Get the + // appropriate address to close out to (which may be nil if neither are + // set) and error if they are both set and do not match. + deliveryScript, err := chooseDeliveryScript( + channel.LocalUpfrontShutdownScript(), req.DeliveryScript, + p.genDeliveryScript, + ) + if err != nil { + return fmt.Errorf("cannot close channel %v: %w", + req.ChanPoint, err) + } + + addr, err := p.addrWithInternalKey(deliveryScript) + if err != nil { + return fmt.Errorf("unable to parse addr for channel "+ + "%v: %w", req.ChanPoint, err) + } + + chanCloser, err := p.createChanCloser( + channel, addr, req.TargetFeePerKw, req, lntypes.Local, + ) + if err != nil { + return fmt.Errorf("unable to make chan closer: %w", err) + } + + chanID := lnwire.NewChanIDFromOutPoint(*req.ChanPoint) + p.activeChanCloses[chanID] = chanCloser + + // Finally, we'll initiate the channel shutdown within the + // chanCloser, and send the shutdown message to the remote + // party to kick things off. + shutdownMsg, err := chanCloser.ShutdownChan() + if err != nil { + // As we were unable to shutdown the channel, we'll return it + // back to its normal state. + defer channel.ResetState() + + delete(p.activeChanCloses, chanID) + + return fmt.Errorf("unable to shutdown channel: %w", err) + } + + link := p.fetchLinkFromKeyAndCid(chanID) + if link == nil { + // If the link is nil then it means it was already removed from + // the switch or it never existed in the first place. The + // latter case is handled at the beginning of this function, so + // in the case where it has already been removed, we can skip + // adding the commit hook to queue a Shutdown message. + p.log.Warnf("link not found during attempted closure: "+ + "%v", chanID) + return nil + } + + if !link.DisableAdds(htlcswitch.Outgoing) { + p.log.Warnf("Outgoing link adds already "+ + "disabled: %v", link.ChanID()) + } + + link.OnCommitOnce(htlcswitch.Outgoing, func() { + p.queueMsg(shutdownMsg, nil) + }) + + return nil +} + // handleLocalCloseReq kicks-off the workflow to execute a cooperative or // forced unilateral closure of the channel initiated by a local subsystem. func (p *Brontide) handleLocalCloseReq(req *htlcswitch.ChanClose) { @@ -3335,81 +3414,12 @@ func (p *Brontide) handleLocalCloseReq(req *htlcswitch.ChanClose) { // out this channel on-chain, so we execute the cooperative channel // closure workflow. case contractcourt.CloseRegular: - // First, we'll choose a delivery address that we'll use to send the - // funds to in the case of a successful negotiation. - - // An upfront shutdown and user provided script are both optional, - // but must be equal if both set (because we cannot serve a request - // to close out to a script which violates upfront shutdown). Get the - // appropriate address to close out to (which may be nil if neither - // are set) and error if they are both set and do not match. - deliveryScript, err := chooseDeliveryScript( - channel.LocalUpfrontShutdownScript(), req.DeliveryScript, - p.genDeliveryScript, - ) - if err != nil { - p.log.Errorf("cannot close channel %v: %v", req.ChanPoint, err) - req.Err <- err - return - } - - addr, err := p.addrWithInternalKey(deliveryScript) - if err != nil { - err = fmt.Errorf("unable to parse addr for channel "+ - "%v: %w", req.ChanPoint, err) - p.log.Errorf(err.Error()) - req.Err <- err - - return - } - chanCloser, err := p.createChanCloser( - channel, addr, req.TargetFeePerKw, req, lntypes.Local, - ) + err := p.initNegotiateChanCloser(req, channel) if err != nil { p.log.Errorf(err.Error()) req.Err <- err - return } - p.activeChanCloses[chanID] = chanCloser - - // Finally, we'll initiate the channel shutdown within the - // chanCloser, and send the shutdown message to the remote - // party to kick things off. - shutdownMsg, err := chanCloser.ShutdownChan() - if err != nil { - p.log.Errorf(err.Error()) - req.Err <- err - delete(p.activeChanCloses, chanID) - - // As we were unable to shutdown the channel, we'll - // return it back to its normal state. - channel.ResetState() - return - } - - link := p.fetchLinkFromKeyAndCid(chanID) - if link == nil { - // If the link is nil then it means it was already - // removed from the switch or it never existed in the - // first place. The latter case is handled at the - // beginning of this function, so in the case where it - // has already been removed, we can skip adding the - // commit hook to queue a Shutdown message. - p.log.Warnf("link not found during attempted closure: "+ - "%v", chanID) - return - } - - if !link.DisableAdds(htlcswitch.Outgoing) { - p.log.Warnf("Outgoing link adds already "+ - "disabled: %v", link.ChanID()) - } - - link.OnCommitOnce(htlcswitch.Outgoing, func() { - p.queueMsg(shutdownMsg, nil) - }) - // A type of CloseBreach indicates that the counterparty has breached // the channel therefore we need to clean up our local state. case contractcourt.CloseBreach: diff --git a/peer/brontide_test.go b/peer/brontide_test.go index 283b62671..3d8023b1a 100644 --- a/peer/brontide_test.go +++ b/peer/brontide_test.go @@ -860,8 +860,10 @@ func TestCustomShutdownScript(t *testing.T) { t.Fatalf("did not receive shutdown message") case err := <-errChan: // Fail if we do not expect an error. - if err != test.expectedError { - t.Fatalf("error closing channel: %v", err) + if test.expectedError != nil { + require.ErrorIs( + t, err, test.expectedError, + ) } // Terminate the test early if have received an error, no From 23a9a761e354635e566c8dce7af0a98b7489fc21 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 31 Jan 2024 19:27:03 -0800 Subject: [PATCH 25/48] peer: add initial awareness of new rbf coop closer In this commit, we use the interfaces we created in the prior commit to make a new method capable of spinning up the new rbf coop closer. --- lnwallet/channel.go | 13 ++++ peer/brontide.go | 158 +++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 170 insertions(+), 1 deletion(-) diff --git a/lnwallet/channel.go b/lnwallet/channel.go index d7489f942..ab064fbd4 100644 --- a/lnwallet/channel.go +++ b/lnwallet/channel.go @@ -9935,3 +9935,16 @@ func (lc *LightningChannel) FundingBlob() fn.Option[tlv.Blob] { return newBlob })(lc.channelState.CustomBlob) } + +// ZeroConfRealScid returns an optional real scid for the channel. If this +// returns None, then this isn't a zero conf channel. Otherwise, the real scid +// value will be returned. +// +//nolint:ll +func (lc *LightningChannel) ZeroConfRealScid() fn.Option[lnwire.ShortChannelID] { + if lc.channelState.IsZeroConf() { + return fn.Some(lc.channelState.ZeroConfRealScid()) + } + + return fn.None[lnwire.ShortChannelID]() +} diff --git a/peer/brontide.go b/peer/brontide.go index 08fe9a27d..5214120a0 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -3,6 +3,7 @@ package peer import ( "bytes" "container/list" + "context" "errors" "fmt" "math/rand" @@ -46,6 +47,7 @@ import ( "github.com/lightningnetwork/lnd/msgmux" "github.com/lightningnetwork/lnd/netann" "github.com/lightningnetwork/lnd/pool" + "github.com/lightningnetwork/lnd/protofsm" "github.com/lightningnetwork/lnd/queue" "github.com/lightningnetwork/lnd/subscribe" "github.com/lightningnetwork/lnd/ticker" @@ -913,6 +915,16 @@ func (p *Brontide) taprootShutdownAllowed() bool { p.LocalFeatures().HasFeature(lnwire.ShutdownAnySegwitOptional) } +// rbfCoopCloseAllowed returns true if both parties have negotiated the new RBF +// coop close feature. +func (p *Brontide) rbfCoopCloseAllowed() bool { + return p.RemoteFeatures().HasFeature( + lnwire.RbfCoopCloseOptionalStaging, + ) && p.LocalFeatures().HasFeature( + lnwire.RbfCoopCloseOptionalStaging, + ) +} + // QuitSignal is a method that should return a channel which will be sent upon // or closed once the backing peer exits. This allows callers using the // interface to cancel any processing in the event the backing implementation @@ -3314,7 +3326,8 @@ func (p *Brontide) createChanCloser(channel *lnwallet.LightningChannel, } // initNegotiateChanCloser initializes the channel closer for a channel that is -// using the original "negotiation" based protocol. +// using the original "negotiation" based protocol. This path is used when +// we're the one initiating the channel close. // // TODO(roasbeef): can make a MsgEndpoint for existing handling logic to // further abstract. @@ -3392,6 +3405,149 @@ func (p *Brontide) initNegotiateChanCloser(req *htlcswitch.ChanClose, return nil } +func chooseAddr(addr lnwire.DeliveryAddress) fn.Option[lnwire.DeliveryAddress] { + if len(addr) == 0 { + return fn.None[lnwire.DeliveryAddress]() + } + + return fn.Some(addr) +} + +// initRbfChanCloser initializes the channel closer for a channel that +// is using the new RBF based co-op close protocol. This only creates the chan +// closer, but doesn't attempt to trigger any manual state transitions. +func (p *Brontide) initRbfChanCloser( + channel *lnwallet.LightningChannel) (*chancloser.RbfChanCloser, error) { + + chanID := lnwire.NewChanIDFromOutPoint(channel.ChannelPoint()) + + link := p.fetchLinkFromKeyAndCid(chanID) + + _, startingHeight, err := p.cfg.ChainIO.GetBestBlock() + if err != nil { + return nil, fmt.Errorf("cannot obtain best block: %w", err) + } + + defaultFeePerKw, err := p.cfg.FeeEstimator.EstimateFeePerKW( + p.cfg.CoopCloseTargetConfs, + ) + if err != nil { + return nil, fmt.Errorf("unable to estimate fee: %w", err) + } + + thawHeight, err := channel.AbsoluteThawHeight() + if err != nil { + return nil, fmt.Errorf("unable to get thaw height: %w", err) + } + + peerPub := *p.IdentityKey() + + msgMapper := chancloser.NewRbfMsgMapper(uint32(startingHeight), chanID, peerPub) + + initialState := chancloser.ChannelActive{} + + scid := channel.ZeroConfRealScid().UnwrapOr( + channel.ShortChanID(), + ) + + env := chancloser.Environment{ + ChainParams: p.cfg.Wallet.Cfg.NetParams, + ChanPeer: peerPub, + ChanPoint: channel.ChannelPoint(), + ChanID: chanID, + Scid: scid, + ChanType: channel.ChanType(), + DefaultFeeRate: defaultFeePerKw.FeePerVByte(), + ThawHeight: fn.Some(thawHeight), + RemoteUpfrontShutdown: chooseAddr( + channel.RemoteUpfrontShutdownScript(), + ), + LocalUpfrontShutdown: chooseAddr( + channel.LocalUpfrontShutdownScript(), + ), + NewDeliveryScript: func() (lnwire.DeliveryAddress, error) { + return p.genDeliveryScript() + }, + FeeEstimator: &chancloser.SimpleCoopFeeEstimator{}, + ChanObserver: newChanObserver( + channel, link, p.cfg.ChanStatusMgr, + ), + } + + spendEvent := protofsm.RegisterSpend[chancloser.ProtocolEvent]{ + OutPoint: channel.ChannelPoint(), + PkScript: channel.FundingTxOut().PkScript, + HeightHint: scid.BlockHeight, + PostSpendEvent: fn.Some[chancloser.RbfSpendMapper]( + chancloser.SpendMapper, + ), + } + + // TODO(roasbeef): edge case here to re-enable a channel before both + // shutdown sent? + + daemonAdapters := NewLndDaemonAdapters(LndAdapterCfg{ + MsgSender: newPeerMsgSender(peerPub, p), + TxBroadcaster: p.cfg.Wallet, + ChainNotifier: p.cfg.ChainNotifier, + }) + + protoCfg := chancloser.RbfChanCloserCfg{ + Daemon: daemonAdapters, + InitialState: &initialState, + Env: &env, + InitEvent: fn.Some[protofsm.DaemonEvent](&spendEvent), + MsgMapper: fn.Some[protofsm.MsgMapper[chancloser.ProtocolEvent]]( //nolint:ll + msgMapper, + ), + } + + chanCloser := protofsm.NewStateMachine(protoCfg) + + // Now that we've created the channel state machine, we'll register for + // a hook to be sent once the channel has been flushed. + link.OnFlushedOnce(func() { + commitState := channel.StateSnapshot() + + ctx := context.Background() + chanCloser.SendEvent(ctx, &chancloser.ChannelFlushed{ + ShutdownBalances: chancloser.ShutdownBalances{ + LocalBalance: commitState.LocalBalance, + RemoteBalance: commitState.RemoteBalance, + }, + }) + }) + + return &chanCloser, nil +} + +// initAndStartRbfChanCloser initializes the channel closer for a channel that +// is using the new RBF based co-op close protocol. This is called when we're +// the one that's initiating the cooperative channel close. +func (p *Brontide) initAndStartRbfChanCloser(req *htlcswitch.ChanClose, + channel *lnwallet.LightningChannel) error { + + // TODO(roasbeef): either kick off sent shutdown or shutdown recv'd + // * can also send the NoDangling in as new event? + + // First, we'll create the channel closer for this channel. + chanCloser, err := p.initRbfChanCloser(channel) + if err != nil { + return err + } + + // With the chan closer created, we'll now kick off the co-op close + // process by instructing it to send a shutdown message to the remote + // party. + ctx := context.Background() + chanCloser.SendEvent(ctx, &chancloser.SendShutdown{ + IdealFeeRate: req.TargetFeePerKw.FeePerVByte(), + DeliveryAddr: chooseAddr(req.DeliveryScript), + }) + + return nil +} + // handleLocalCloseReq kicks-off the workflow to execute a cooperative or // forced unilateral closure of the channel initiated by a local subsystem. func (p *Brontide) handleLocalCloseReq(req *htlcswitch.ChanClose) { From 2dae0ba96ebc4575aca4483324abcd20fe4764be Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 31 Jan 2024 19:48:15 -0800 Subject: [PATCH 26/48] peer: add new composite chanCloserFsm type In this commit, we add a new composite chanCloserFsm type. This'll allow us to store a single value that might be a negotiator or and rbf-er. In a follow up commit, we'll use this to conditionally create the new rbf closer. --- peer/brontide.go | 64 ++++++++++++++++++++++++++++++++++++------------ 1 file changed, 49 insertions(+), 15 deletions(-) diff --git a/peer/brontide.go b/peer/brontide.go index 5214120a0..816fd37d7 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -445,6 +445,18 @@ type Config struct { Quit chan struct{} } +// chanCloserFsm is a union-like type that can hold the two versions of co-op +// close we support: negotiation, and RBF based. +// +// TODO(roasbeef): rename to chancloser.Negotiator and chancloser.RBF? +type chanCloserFsm = fn.Either[*chancloser.ChanCloser, *chancloser.RbfChanCloser] //nolint:ll + +func makeNegotiateCloser(chanCloser *chancloser.ChanCloser) chanCloserFsm { + return fn.NewLeft[*chancloser.ChanCloser, *chancloser.RbfChanCloser]( + chanCloser, + ) +} + // Brontide is an active peer on the Lightning Network. This struct is responsible // for managing any channel state related to this peer. To do so, it has // several helper goroutines to handle events such as HTLC timeouts, new @@ -543,7 +555,7 @@ type Brontide struct { // cooperative channel closures. Any channel closing messages are directed // to one of these active state machines. Once the channel has been closed, // the state machine will be deleted from the map. - activeChanCloses map[lnwire.ChannelID]*chancloser.ChanCloser + activeChanCloses map[lnwire.ChannelID]chanCloserFsm // localCloseChanReqs is a channel in which any local requests to close // a particular channel are sent over. @@ -629,7 +641,7 @@ func NewBrontide(cfg Config) *Brontide { removePendingChannel: make(chan *newChannelMsg), activeMsgStreams: make(map[lnwire.ChannelID]*msgStream), - activeChanCloses: make(map[lnwire.ChannelID]*chancloser.ChanCloser), + activeChanCloses: make(map[lnwire.ChannelID]chanCloserFsm), localCloseChanReqs: make(chan *htlcswitch.ChanClose), linkFailures: make(chan linkFailureReport), chanCloseMsgs: make(chan *closeMsg), @@ -1218,8 +1230,9 @@ func (p *Brontide) loadActiveChannels(chans []*channeldb.OpenChannel) ( "delivery addr: %w", err) return } - chanCloser, err := p.createChanCloser( - lnChan, addr, feePerKw, nil, info.Closer(), + negotiateChanCloser, err := p.createChanCloser( + lnChan, addr, feePerKw, nil, + info.Closer(), ) if err != nil { shutdownInfoErr = fmt.Errorf("unable to "+ @@ -1232,10 +1245,14 @@ func (p *Brontide) loadActiveChannels(chans []*channeldb.OpenChannel) ( lnChan.State().FundingOutpoint, ) + chanCloser := makeNegotiateCloser( + negotiateChanCloser, + ) + p.activeChanCloses[chanID] = chanCloser // Create the Shutdown message. - shutdown, err := chanCloser.ShutdownChan() + shutdown, err := negotiateChanCloser.ShutdownChan() if err != nil { delete(p.activeChanCloses, chanID) shutdownInfoErr = err @@ -2947,7 +2964,7 @@ func (p *Brontide) reenableActiveChannels() { // Otherwise, either an existing state machine will be returned, or a new one // will be created. func (p *Brontide) fetchActiveChanCloser(chanID lnwire.ChannelID) ( - *chancloser.ChanCloser, error) { + *chanCloserFsm, error) { chanCloser, found := p.activeChanCloses[chanID] if found { @@ -2955,7 +2972,7 @@ func (p *Brontide) fetchActiveChanCloser(chanID lnwire.ChannelID) ( // created for a non-pending channel or for a channel that had // previously started the shutdown process but the connection // was restarted. - return chanCloser, nil + return &chanCloser, nil } // First, we'll ensure that we actually know of the target channel. If @@ -3001,7 +3018,7 @@ func (p *Brontide) fetchActiveChanCloser(chanID lnwire.ChannelID) ( if err != nil { return nil, fmt.Errorf("unable to parse addr: %w", err) } - chanCloser, err = p.createChanCloser( + negotiateChanCloser, err := p.createChanCloser( channel, addr, feePerKw, nil, lntypes.Remote, ) if err != nil { @@ -3009,9 +3026,11 @@ func (p *Brontide) fetchActiveChanCloser(chanID lnwire.ChannelID) ( return nil, fmt.Errorf("unable to create chan closer") } + chanCloser = makeNegotiateCloser(negotiateChanCloser) + p.activeChanCloses[chanID] = chanCloser - return chanCloser, nil + return &chanCloser, nil } // filterChannelsToEnable filters a list of channels to be enabled upon start. @@ -3265,7 +3284,7 @@ func (p *Brontide) restartCoopClose(lnChan *lnwallet.LightningChannel) ( // goroutine since this is done before the channelManager goroutine is // created. chanID := lnwire.NewChanIDFromOutPoint(c.FundingOutpoint) - p.activeChanCloses[chanID] = chanCloser + p.activeChanCloses[chanID] = makeNegotiateCloser(chanCloser) // Create the Shutdown message. shutdownMsg, err := chanCloser.ShutdownChan() @@ -3365,7 +3384,7 @@ func (p *Brontide) initNegotiateChanCloser(req *htlcswitch.ChanClose, } chanID := lnwire.NewChanIDFromOutPoint(*req.ChanPoint) - p.activeChanCloses[chanID] = chanCloser + p.activeChanCloses[chanID] = makeNegotiateCloser(chanCloser) // Finally, we'll initiate the channel shutdown within the // chanCloser, and send the shutdown message to the remote @@ -3469,6 +3488,7 @@ func (p *Brontide) initRbfChanCloser( return p.genDeliveryScript() }, FeeEstimator: &chancloser.SimpleCoopFeeEstimator{}, + CloseSigner: channel, ChanObserver: newChanObserver( channel, link, p.cfg.ChanStatusMgr, ), @@ -4165,7 +4185,7 @@ func (p *Brontide) handleCloseMsg(msg *closeMsg) { // We'll now fetch the matching closing state machine in order to continue, // or finalize the channel closure process. - chanCloser, err := p.fetchActiveChanCloser(msg.cid) + chanCloserE, err := p.fetchActiveChanCloser(msg.cid) if err != nil { // If the channel is not known to us, we'll simply ignore this message. if err == ErrChannelNotFound { @@ -4182,17 +4202,31 @@ func (p *Brontide) handleCloseMsg(msg *closeMsg) { return } + if chanCloserE.IsRight() { + // TODO(roasbeef): assert? + return + } + + // At this point, we'll only enter this call path if a negotiate chan + // closer was used. So we'll extract that from the either now. + // + // TODO(roabeef): need extra helper func for either to make cleaner + var chanCloser *chancloser.ChanCloser + chanCloserE.WhenLeft(func(c *chancloser.ChanCloser) { + chanCloser = c + }) + handleErr := func(err error) { err = fmt.Errorf("unable to process close msg: %w", err) p.log.Error(err) - // As the negotiations failed, we'll reset the channel state machine to - // ensure we act to on-chain events as normal. + // As the negotiations failed, we'll reset the channel state + // machine to ensure we act to on-chain events as normal. chanCloser.Channel().ResetState() - if chanCloser.CloseRequest() != nil { chanCloser.CloseRequest().Err <- err } + delete(p.activeChanCloses, msg.cid) p.Disconnect(err) From 4fff0d8401712f449b6e6355efc47859fba0f53c Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 5 Mar 2024 00:08:11 -0600 Subject: [PATCH 27/48] peer: create ErrorReporter implementation for rbf-fsm --- peer/brontide.go | 76 +++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 69 insertions(+), 7 deletions(-) diff --git a/peer/brontide.go b/peer/brontide.go index 816fd37d7..559d4fd5a 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -3432,6 +3432,70 @@ func chooseAddr(addr lnwire.DeliveryAddress) fn.Option[lnwire.DeliveryAddress] { return fn.Some(addr) } +// chanErrorReporter is a simple implementation of the +// chancloser.ErrorReporter. This is bound to a single channel by the channel +// ID. +type chanErrorReporter struct { + chanID lnwire.ChannelID + peer *Brontide +} + +// newChanErrorReporter creates a new instance of the chanErrorReporter. +func newChanErrorReporter(chanID lnwire.ChannelID, + peer *Brontide) *chanErrorReporter { + + return &chanErrorReporter{ + chanID: chanID, + peer: peer, + } +} + +// ReportError is a method that's used to report an error that occurred during +// state machine execution. This is used by the RBF close state machine to +// terminate the state machine and send an error to the remote peer. +// +// This is a part of the chancloser.ErrorReporter interface. +func (c *chanErrorReporter) ReportError(chanErr error) { + var errMsg []byte + if errors.Is(chanErr, chancloser.ErrInvalidStateTransition) { + errMsg = []byte("unexpected protocol message") + } else { + errMsg = []byte(chanErr.Error()) + } + + err := c.peer.SendMessageLazy(false, &lnwire.Error{ + ChanID: c.chanID, + Data: errMsg, + }) + if err != nil { + c.peer.log.Warnf("unable to send error message to peer: %v", + err) + } + + // After we send the error message to the peer, we'll re-initialize the + // coop close state machine as they may send a shutdown message to + // retry the coop close. + lnChan, ok := c.peer.activeChannels.Load(c.chanID) + if !ok { + return + } + + if lnChan == nil { + c.peer.log.Debugf("channel %v is pending, not "+ + "re-initializing coop close state machine", + c.chanID) + + return + } + + if _, err := c.peer.initRbfChanCloser(lnChan); err != nil { + delete(c.peer.activeChanCloses, c.chanID) + + c.peer.log.Errorf("unable to init RBF chan closer after "+ + "error case: %v", err) + } +} + // initRbfChanCloser initializes the channel closer for a channel that // is using the new RBF based co-op close protocol. This only creates the chan // closer, but doesn't attempt to trigger any manual state transitions. @@ -3503,9 +3567,6 @@ func (p *Brontide) initRbfChanCloser( ), } - // TODO(roasbeef): edge case here to re-enable a channel before both - // shutdown sent? - daemonAdapters := NewLndDaemonAdapters(LndAdapterCfg{ MsgSender: newPeerMsgSender(peerPub, p), TxBroadcaster: p.cfg.Wallet, @@ -3513,10 +3574,11 @@ func (p *Brontide) initRbfChanCloser( }) protoCfg := chancloser.RbfChanCloserCfg{ - Daemon: daemonAdapters, - InitialState: &initialState, - Env: &env, - InitEvent: fn.Some[protofsm.DaemonEvent](&spendEvent), + Daemon: daemonAdapters, + InitialState: &initialState, + Env: &env, + InitEvent: fn.Some[protofsm.DaemonEvent](&spendEvent), + ErrorReporter: newChanErrorReporter(chanID, p), MsgMapper: fn.Some[protofsm.MsgMapper[chancloser.ProtocolEvent]]( //nolint:ll msgMapper, ), From f22cba9de1f49a39786269fa949f7be861ff653b Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 31 Jan 2024 19:51:37 -0800 Subject: [PATCH 28/48] peer: conditionally create new RBF chan closer --- peer/brontide.go | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/peer/brontide.go b/peer/brontide.go index 559d4fd5a..ef509ae33 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -457,6 +457,12 @@ func makeNegotiateCloser(chanCloser *chancloser.ChanCloser) chanCloserFsm { ) } +func makeRbfCloser(rbfCloser *chancloser.RbfChanCloser) chanCloserFsm { + return fn.NewRight[*chancloser.ChanCloser]( + rbfCloser, + ) +} + // Brontide is an active peer on the Lightning Network. This struct is responsible // for managing any channel state related to this peer. To do so, it has // several helper goroutines to handle events such as HTLC timeouts, new @@ -3586,6 +3592,8 @@ func (p *Brontide) initRbfChanCloser( chanCloser := protofsm.NewStateMachine(protoCfg) + p.activeChanCloses[chanID] = makeRbfCloser(&chanCloser) + // Now that we've created the channel state machine, we'll register for // a hook to be sent once the channel has been flushed. link.OnFlushedOnce(func() { @@ -3652,7 +3660,14 @@ func (p *Brontide) handleLocalCloseReq(req *htlcswitch.ChanClose) { // out this channel on-chain, so we execute the cooperative channel // closure workflow. case contractcourt.CloseRegular: - err := p.initNegotiateChanCloser(req, channel) + var err error + switch { + case p.rbfCoopCloseAllowed(): + err = p.initAndStartRbfChanCloser(req, channel) + default: + err = p.initNegotiateChanCloser(req, channel) + } + if err != nil { p.log.Errorf(err.Error()) req.Err <- err From 6364e98f0eac27c5f13fb08e9bbbce5671619ba7 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 5 Mar 2024 00:15:46 -0600 Subject: [PATCH 29/48] peer: conditionally create rbf coop close fsm based on feature bits In this commit, we fully integrate the new RBF close state machine into the peer. For the restart case after shutdown, we can short circuit the existing logic as the new FSM will handle retransmitting the shutdown message itself, and doesn't need to delegate that duty to the link. Unlike the existing state machine, we're able to restart the flow to sign a coop close with a new higher fee rate. In this case, we can now send multiple updates to the RPC caller, one for each newly singed coop close transaction. To implement the async flush case, we'll launch a new goroutine to wait until the state machine reaches the `ChannelFlushing` state, then we'll register the hook. We don't do this at start up, as otherwise the channel may _already_ be flushed, triggering an invalid state transition. --- msgmux/msg_router.go | 13 +- msgmux/msg_router_test.go | 22 +- peer/brontide.go | 447 ++++++++++++++++++++++++++++++++++---- peer/chan_observer.go | 2 - peer/daemon_adapters.go | 8 - 5 files changed, 425 insertions(+), 67 deletions(-) diff --git a/msgmux/msg_router.go b/msgmux/msg_router.go index 736c085a9..9aac3bc64 100644 --- a/msgmux/msg_router.go +++ b/msgmux/msg_router.go @@ -1,6 +1,7 @@ package msgmux import ( + "context" "fmt" "maps" "sync" @@ -46,7 +47,7 @@ type Endpoint interface { // SendMessage handles the target message, and returns true if the // message was able being processed. - SendMessage(msg PeerMsg) bool + SendMessage(ctx context.Context, msg PeerMsg) bool } // MsgRouter is an interface that represents a message router, which is generic @@ -66,7 +67,7 @@ type Router interface { RouteMsg(PeerMsg) error // Start starts the peer message router. - Start() + Start(ctx context.Context) // Stop stops the peer message router. Stop() @@ -137,12 +138,12 @@ func NewMultiMsgRouter() *MultiMsgRouter { } // Start starts the peer message router. -func (p *MultiMsgRouter) Start() { +func (p *MultiMsgRouter) Start(ctx context.Context) { log.Infof("Starting Router") p.startOnce.Do(func() { p.wg.Add(1) - go p.msgRouter() + go p.msgRouter(ctx) }) } @@ -179,7 +180,7 @@ func (p *MultiMsgRouter) endpoints() fn.Result[EndpointsMap] { } // msgRouter is the main goroutine that handles all incoming messages. -func (p *MultiMsgRouter) msgRouter() { +func (p *MultiMsgRouter) msgRouter(ctx context.Context) { defer p.wg.Done() // endpoints is a map of all registered endpoints. @@ -235,7 +236,7 @@ func (p *MultiMsgRouter) msgRouter() { "msg %T to endpoint %s", msg, endpoint.Name()) - sent := endpoint.SendMessage(msg) + sent := endpoint.SendMessage(ctx, msg) couldSend = couldSend || sent } } diff --git a/msgmux/msg_router_test.go b/msgmux/msg_router_test.go index af8cdedef..d6262a7ab 100644 --- a/msgmux/msg_router_test.go +++ b/msgmux/msg_router_test.go @@ -1,6 +1,7 @@ package msgmux import ( + "context" "testing" "github.com/lightningnetwork/lnd/lnwire" @@ -24,7 +25,7 @@ func (m *mockEndpoint) CanHandle(msg PeerMsg) bool { return args.Bool(0) } -func (m *mockEndpoint) SendMessage(msg PeerMsg) bool { +func (m *mockEndpoint) SendMessage(ctx context.Context, msg PeerMsg) bool { args := m.Called(msg) return args.Bool(0) @@ -33,8 +34,9 @@ func (m *mockEndpoint) SendMessage(msg PeerMsg) bool { // TestMessageRouterOperation tests the basic operation of the message router: // add new endpoints, route to them, remove, them, etc. func TestMessageRouterOperation(t *testing.T) { + ctx := context.Background() msgRouter := NewMultiMsgRouter() - msgRouter.Start() + msgRouter.Start(ctx) defer msgRouter.Stop() openChanMsg := PeerMsg{ @@ -57,7 +59,7 @@ func TestMessageRouterOperation(t *testing.T) { fundingEndpoint.On("CanHandle", openChanMsg).Return(true) fundingEndpoint.On("CanHandle", errorMsg).Return(false) fundingEndpoint.On("CanHandle", commitSigMsg).Return(false) - fundingEndpoint.On("SendMessage", openChanMsg).Return(true) + fundingEndpoint.On("SendMessage", ctx, openChanMsg).Return(true) commitEndpoint := &mockEndpoint{} commitEndpointName := "commit" @@ -65,7 +67,7 @@ func TestMessageRouterOperation(t *testing.T) { commitEndpoint.On("CanHandle", commitSigMsg).Return(true) commitEndpoint.On("CanHandle", openChanMsg).Return(false) commitEndpoint.On("CanHandle", errorMsg).Return(false) - commitEndpoint.On("SendMessage", commitSigMsg).Return(true) + commitEndpoint.On("SendMessage", ctx, commitSigMsg).Return(true) t.Run("add endpoints", func(t *testing.T) { // First, we'll add the funding endpoint to the router. @@ -113,8 +115,10 @@ func TestMessageRouterOperation(t *testing.T) { fundingEndpoint.AssertCalled(t, "CanHandle", openChanMsg) commitEndpoint.AssertCalled(t, "CanHandle", openChanMsg) - fundingEndpoint.AssertCalled(t, "SendMessage", openChanMsg) - commitEndpoint.AssertNotCalled(t, "SendMessage", openChanMsg) + fundingEndpoint.AssertCalled(t, "SendMessage", ctx, openChanMsg) + commitEndpoint.AssertNotCalled( + t, "SendMessage", ctx, openChanMsg, + ) // We'll do the same for the commit sig message. require.NoError(t, msgRouter.RouteMsg(commitSigMsg)) @@ -122,8 +126,10 @@ func TestMessageRouterOperation(t *testing.T) { fundingEndpoint.AssertCalled(t, "CanHandle", commitSigMsg) commitEndpoint.AssertCalled(t, "CanHandle", commitSigMsg) - commitEndpoint.AssertCalled(t, "SendMessage", commitSigMsg) - fundingEndpoint.AssertNotCalled(t, "SendMessage", commitSigMsg) + commitEndpoint.AssertCalled(t, "SendMessage", ctx, commitSigMsg) + fundingEndpoint.AssertNotCalled( + t, "SendMessage", ctx, commitSigMsg, + ) }) t.Run("remove endpoints", func(t *testing.T) { diff --git a/peer/brontide.go b/peer/brontide.go index ef509ae33..eed66cfd0 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -451,12 +451,15 @@ type Config struct { // TODO(roasbeef): rename to chancloser.Negotiator and chancloser.RBF? type chanCloserFsm = fn.Either[*chancloser.ChanCloser, *chancloser.RbfChanCloser] //nolint:ll +// makeNegotiateCloser creates a new negotiate closer from a +// chancloser.ChanCloser. func makeNegotiateCloser(chanCloser *chancloser.ChanCloser) chanCloserFsm { return fn.NewLeft[*chancloser.ChanCloser, *chancloser.RbfChanCloser]( chanCloser, ) } +// makeRbfCloser creates a new RBF closer from a chancloser.RbfChanCloser. func makeRbfCloser(rbfCloser *chancloser.RbfChanCloser) chanCloserFsm { return fn.NewRight[*chancloser.ChanCloser]( rbfCloser, @@ -468,7 +471,6 @@ func makeRbfCloser(rbfCloser *chancloser.RbfChanCloser) chanCloserFsm { // several helper goroutines to handle events such as HTLC timeouts, new // funding workflow, and detecting an uncooperative closure of any active // channels. -// TODO(roasbeef): proper reconnection logic. type Brontide struct { // MUST be used atomically. started int32 @@ -615,7 +617,8 @@ type Brontide struct { log btclog.Logger } -// A compile-time check to ensure that Brontide satisfies the lnpeer.Peer interface. +// A compile-time check to ensure that Brontide satisfies the lnpeer.Peer +// interface. var _ lnpeer.Peer = (*Brontide)(nil) // NewBrontide creates a new Brontide from a peer.Config struct. @@ -839,7 +842,7 @@ func (p *Brontide) Start() error { // Register the message router now as we may need to register some // endpoints while loading the channels below. p.msgRouter.WhenSome(func(router msgmux.Router) { - router.Start() + router.Start(context.Background()) }) msgs, err := p.loadActiveChannels(activeChans) @@ -1217,6 +1220,12 @@ func (p *Brontide) loadActiveChannels(chans []*channeldb.OpenChannel) ( shutdownInfoErr error ) shutdownInfo.WhenSome(func(info channeldb.ShutdownInfo) { + // If we can use the new RBF close feature, we don't + // need to create the legacy closer. + if p.rbfCoopCloseAllowed() { + return + } + // Compute an ideal fee. feePerKw, err := p.cfg.FeeEstimator.EstimateFeePerKW( p.cfg.CoopCloseTargetConfs, @@ -1290,6 +1299,39 @@ func (p *Brontide) loadActiveChannels(chans []*channeldb.OpenChannel) ( } p.activeChannels.Store(chanID, lnChan) + + // We're using the old co-op close, so we don't need to init + // the new RBF chan closer. + if !p.rbfCoopCloseAllowed() { + continue + } + + // Now that the link has been added above, we'll also init an + // RBF chan closer for this channel, but only if the new close + // feature is negotiated. + // + // Creating this here ensures that any shutdown messages sent + // will be automatically routed by the msg router. + if _, err := p.initRbfChanCloser(lnChan); err != nil { + delete(p.activeChanCloses, chanID) + + return nil, fmt.Errorf("unable to init RBF chan "+ + "closer during peer connect: %w", err) + } + + // If the shutdown info isn't blank, then we should kick things + // off by sending a shutdown message to the remote party to + // continue the old shutdown flow. + restartShutdown := func(s channeldb.ShutdownInfo) error { + return p.startRbfChanCloser( + newRestartShutdownInit(s), lnChan, + ) + } + err = fn.MapOptionZ(shutdownInfo, restartShutdown) + if err != nil { + return nil, fmt.Errorf("unable to start RBF "+ + "chan closer: %w", err) + } } return msgs, nil @@ -3223,12 +3265,15 @@ func (p *Brontide) restartCoopClose(lnChan *lnwallet.LightningChannel) ( if err != nil && err != channeldb.ErrNoCloseTx { // An error other than ErrNoCloseTx was encountered. return nil, err - } else if err == nil { - // This channel has already completed the coop close - // negotiation. + } else if err == nil && !p.rbfCoopCloseAllowed() { + // This is a channel that doesn't support RBF coop close, and it + // already had a coop close txn broadcast. As a result, we can + // just exit here as all we can do is wait for it to confirm. return nil, nil } + chanID := lnwire.NewChanIDFromOutPoint(c.FundingOutpoint) + var deliveryScript []byte shutdownInfo, err := c.ShutdownInfo() @@ -3258,6 +3303,27 @@ func (p *Brontide) restartCoopClose(lnChan *lnwallet.LightningChannel) ( } } + // If the new RBF co-op close is negotiated, then we'll init and start + // that state machine, skipping the steps for the negotiate machine + // below. + if p.rbfCoopCloseAllowed() { + _, err := p.initRbfChanCloser(lnChan) + if err != nil { + return nil, fmt.Errorf("unable to init rbf chan "+ + "closer during restart: %w", err) + } + + shutdownDesc := fn.MapOption( + newRestartShutdownInit, + )(shutdownInfo) + + err = p.startRbfChanCloser( + fn.FlattenOption(shutdownDesc), lnChan, + ) + + return nil, err + } + // Compute an ideal fee. feePerKw, err := p.cfg.FeeEstimator.EstimateFeePerKW( p.cfg.CoopCloseTargetConfs, @@ -3289,7 +3355,6 @@ func (p *Brontide) restartCoopClose(lnChan *lnwallet.LightningChannel) ( // This does not need a mutex even though it is in a different // goroutine since this is done before the channelManager goroutine is // created. - chanID := lnwire.NewChanIDFromOutPoint(c.FundingOutpoint) p.activeChanCloses[chanID] = makeNegotiateCloser(chanCloser) // Create the Shutdown message. @@ -3430,6 +3495,8 @@ func (p *Brontide) initNegotiateChanCloser(req *htlcswitch.ChanClose, return nil } +// chooseAddr returns the provided address if it is non-zero length, otherwise +// None. func chooseAddr(addr lnwire.DeliveryAddress) fn.Option[lnwire.DeliveryAddress] { if len(addr) == 0 { return fn.None[lnwire.DeliveryAddress]() @@ -3438,6 +3505,101 @@ func chooseAddr(addr lnwire.DeliveryAddress) fn.Option[lnwire.DeliveryAddress] { return fn.Some(addr) } +// observeRbfCloseUpdates observes the channel for any updates that may +// indicate that a new txid has been broadcasted, or the channel fully closed +// on chain. +func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, + closeReq *htlcswitch.ChanClose) { + + coopCloseStates := chanCloser.RegisterStateEvents() + defer chanCloser.RemoveStateSub(coopCloseStates) + + newStateChan := coopCloseStates.NewItemCreated.ChanOut() + + var lastLocalTxid, lastRemoteTxid chainhash.Hash + + maybeNotifyTxBroadcast := func(state chancloser.AsymmetricPeerState, + local bool) { + + closePending, ok := state.(*chancloser.ClosePending) + + // If this isn't the close pending state, we aren't at the + // terminal state yet. + if !ok { + return + } + + lastTxid := lastLocalTxid + if !local { + lastTxid = lastRemoteTxid + } + + // Otherwise, we'll have a txid that we can use to notify the + // client, but only if it's different from the last one we + // sent. + closingTxid := closePending.CloseTx.TxHash() + if closeReq != nil && closingTxid != lastTxid { + closeReq.Updates <- &PendingUpdate{ + Txid: closingTxid[:], + } + } + + } + + // We'll consume each new incoming state to send out the appropriate + // RPC update. + for { + select { + case newState := <-newStateChan: + + switch closeState := newState.(type) { + // Once we've reached the state of pending close, we + // have a txid that we broadcasted. + case *chancloser.ClosingNegotiation: + peerState := closeState.PeerState + + // Each side may have gained a new co-op close + // tx, so we'll examine both to see if they've + // changed. + maybeNotifyTxBroadcast( + peerState.GetForParty(lntypes.Local), + true, + ) + maybeNotifyTxBroadcast( + peerState.GetForParty(lntypes.Remote), + false, + ) + + // Otherwise, if we're transition to CloseFin, then we + // know that we're done. + case *chancloser.CloseFin: + // To clean up, we'll remove the chan closer + // from the active map, and send the final + // update to the client. + closingTxid := closeState.ConfirmedTx.TxHash() + if closeReq != nil { + closeReq.Updates <- &ChannelCloseUpdate{ + ClosingTxid: closingTxid[:], + Success: true, + } + } + + // TODO(roasbeef): race, make to sync map? + chanID := lnwire.NewChanIDFromOutPoint( + *closeReq.ChanPoint, + ) + delete(p.activeChanCloses, chanID) + } + + case <-closeReq.Ctx.Done(): + return + + case <-p.cg.Done(): + return + } + } +} + // chanErrorReporter is a simple implementation of the // chancloser.ErrorReporter. This is bound to a single channel by the channel // ID. @@ -3502,6 +3664,66 @@ func (c *chanErrorReporter) ReportError(chanErr error) { } } +// chanFlushEventSentinel is used to send the RBF coop close state machine the +// channel flushed event. We'll wait until the state machine enters the +// ChannelFlushing state, then request the link to send the event once flushed. +// +// NOTE: This MUST be run as a goroutine. +func (p *Brontide) chanFlushEventSentinel(chanCloser *chancloser.RbfChanCloser, + link htlcswitch.ChannelUpdateHandler, + channel *lnwallet.LightningChannel) { + + defer p.cg.WgDone() + + // If there's no link, then the channel has already been flushed, so we + // don't need to continue. + if link == nil { + return + } + + coopCloseStates := chanCloser.RegisterStateEvents() + defer chanCloser.RemoveStateSub(coopCloseStates) + + newStateChan := coopCloseStates.NewItemCreated.ChanOut() + + sendChanFlushed := func() { + chanState := channel.StateSnapshot() + + peerLog.Infof("ChannelPoint(%v) has been flushed for co-op "+ + "close, sending event to chan closer", + channel.ChannelPoint()) + + chanBalances := chancloser.ShutdownBalances{ + LocalBalance: chanState.LocalBalance, + RemoteBalance: chanState.RemoteBalance, + } + ctx := context.Background() + chanCloser.SendEvent(ctx, &chancloser.ChannelFlushed{ + ShutdownBalances: chanBalances, + FreshFlush: true, + }) + } + + // We'll wait until the channel enters the ChannelFlushing state. We + // exit after a success loop. As after the first RBF iteration, the + // channel will always be flushed. + for newState := range newStateChan { + if _, ok := newState.(*chancloser.ChannelFlushing); ok { + peerLog.Infof("ChannelPoint(%v): rbf coop "+ + "close is awaiting a flushed state, "+ + "registering with link..., ", + channel.ChannelPoint()) + + // Request the link to send the event once the channel + // is flushed. We only need this event sent once, so we + // can exit now. + link.OnFlushedOnce(sendChanFlushed) + + return + } + } +} + // initRbfChanCloser initializes the channel closer for a channel that // is using the new RBF based co-op close protocol. This only creates the chan // closer, but doesn't attempt to trigger any manual state transitions. @@ -3590,49 +3812,162 @@ func (p *Brontide) initRbfChanCloser( ), } + ctx := context.Background() chanCloser := protofsm.NewStateMachine(protoCfg) + chanCloser.Start(ctx) + + // Finally, we'll register this new endpoint with the message router so + // future co-op close messages are handled by this state machine. + err = fn.MapOptionZ(p.msgRouter, func(r msgmux.Router) error { + return r.RegisterEndpoint(&chanCloser) + }) + if err != nil { + chanCloser.Stop() + delete(p.activeChanCloses, chanID) + + return nil, fmt.Errorf("unable to register endpoint for co-op "+ + "close: %w", err) + } p.activeChanCloses[chanID] = makeRbfCloser(&chanCloser) - // Now that we've created the channel state machine, we'll register for - // a hook to be sent once the channel has been flushed. - link.OnFlushedOnce(func() { - commitState := channel.StateSnapshot() - - ctx := context.Background() - chanCloser.SendEvent(ctx, &chancloser.ChannelFlushed{ - ShutdownBalances: chancloser.ShutdownBalances{ - LocalBalance: commitState.LocalBalance, - RemoteBalance: commitState.RemoteBalance, - }, - }) - }) + // Now that we've created the rbf closer state machine, we'll launch a + // new goroutine to eventually send in the ChannelFlushed event once + // needed. + p.cg.WgAdd(1) + go p.chanFlushEventSentinel(&chanCloser, link, channel) return &chanCloser, nil } -// initAndStartRbfChanCloser initializes the channel closer for a channel that -// is using the new RBF based co-op close protocol. This is called when we're -// the one that's initiating the cooperative channel close. -func (p *Brontide) initAndStartRbfChanCloser(req *htlcswitch.ChanClose, +// shutdownInit describes the two ways we can initiate a new shutdown. Either we +// got an RPC request to do so (left), or we sent a shutdown message to the +// party (for w/e reason), but crashed before the close was complete. +// +//nolint:ll +type shutdownInit = fn.Option[fn.Either[*htlcswitch.ChanClose, channeldb.ShutdownInfo]] + +// shutdownStartFeeRate returns the fee rate that should be used for the +// shutdown. This returns a doubly wrapped option as the shutdown info might +// be none, and the fee rate is only defined for the user initiated shutdown. +func shutdownStartFeeRate(s shutdownInit) fn.Option[chainfee.SatPerKWeight] { + feeRateOpt := fn.MapOption(func(init fn.Either[*htlcswitch.ChanClose, + channeldb.ShutdownInfo]) fn.Option[chainfee.SatPerKWeight] { + + var feeRate fn.Option[chainfee.SatPerKWeight] + init.WhenLeft(func(req *htlcswitch.ChanClose) { + feeRate = fn.Some(req.TargetFeePerKw) + }) + + return feeRate + })(s) + + return fn.FlattenOption(feeRateOpt) +} + +// shutdownStartAddr returns the delivery address that should be used when +// restarting the shutdown process. If we didn't send a shutdown before we +// restarted, and the user didn't initiate one either, then None is returned. +func shutdownStartAddr(s shutdownInit) fn.Option[lnwire.DeliveryAddress] { + addrOpt := fn.MapOption(func(init fn.Either[*htlcswitch.ChanClose, + channeldb.ShutdownInfo]) fn.Option[lnwire.DeliveryAddress] { + + var addr fn.Option[lnwire.DeliveryAddress] + init.WhenLeft(func(req *htlcswitch.ChanClose) { + if len(req.DeliveryScript) != 0 { + addr = fn.Some(req.DeliveryScript) + } + }) + init.WhenRight(func(info channeldb.ShutdownInfo) { + addr = fn.Some(info.DeliveryScript.Val) + }) + + return addr + })(s) + + return fn.FlattenOption(addrOpt) +} + +// whenRpcShutdown registers a callback to be executed when the shutdown init +// type is and RPC request. +func whenRpcShutdown(s shutdownInit, f func(r *htlcswitch.ChanClose)) { + s.WhenSome(func(init fn.Either[*htlcswitch.ChanClose, + channeldb.ShutdownInfo]) { + + init.WhenLeft(f) + }) +} + +// newRestartShutdownInit creates a new shutdownInit for the case where we need +// to restart the shutdown flow after a restart. +func newRestartShutdownInit(info channeldb.ShutdownInfo) shutdownInit { + return fn.Some(fn.NewRight[*htlcswitch.ChanClose](info)) +} + +// newRPCShutdownInit creates a new shutdownInit for the case where we +// initiated the shutdown via an RPC client. +func newRPCShutdownInit(req *htlcswitch.ChanClose) shutdownInit { + return fn.Some( + fn.NewLeft[*htlcswitch.ChanClose, channeldb.ShutdownInfo](req), + ) +} + +// startRbfChanCloser kicks off the co-op close process using the new RBF based +// co-op close protocol. This is called when we're the one that's initiating +// the cooperative channel close. +// +// TODO(roasbeef): just accept the two shutdown pointer params instead?? +func (p *Brontide) startRbfChanCloser(shutdown shutdownInit, channel *lnwallet.LightningChannel) error { - // TODO(roasbeef): either kick off sent shutdown or shutdown recv'd - // * can also send the NoDangling in as new event? - - // First, we'll create the channel closer for this channel. - chanCloser, err := p.initRbfChanCloser(channel) - if err != nil { - return err + // Unlike the old negotiate chan closer, we'll always create the RBF + // chan closer on startup, so we can skip init here. + chanID := lnwire.NewChanIDFromOutPoint(channel.ChannelPoint()) + chanCloser, found := p.activeChanCloses[chanID] + if !found { + return fmt.Errorf("rbf can closer not found for channel %v", + channel.ChannelPoint()) } - // With the chan closer created, we'll now kick off the co-op close - // process by instructing it to send a shutdown message to the remote - // party. - ctx := context.Background() - chanCloser.SendEvent(ctx, &chancloser.SendShutdown{ - IdealFeeRate: req.TargetFeePerKw.FeePerVByte(), - DeliveryAddr: chooseAddr(req.DeliveryScript), + defaultFeePerKw, err := shutdownStartFeeRate( + shutdown, + ).UnwrapOrFuncErr(func() (chainfee.SatPerKWeight, error) { + return p.cfg.FeeEstimator.EstimateFeePerKW( + p.cfg.CoopCloseTargetConfs, + ) + }) + if err != nil { + return fmt.Errorf("unable to estimate fee: %w", err) + } + + chanCloser.WhenRight(func(rbfCloser *chancloser.RbfChanCloser) { + peerLog.Infof("ChannelPoint(%v): rbf-coop close requested, "+ + "sending shutdown", channel.ChannelPoint()) + + // With the chan closer created, we'll now kick off the co-op + // close process by instructing it to send a shutdown message + // to the remote party. + ctx := context.Background() + rbfCloser.SendEvent(ctx, &chancloser.SendShutdown{ + IdealFeeRate: defaultFeePerKw.FeePerVByte(), + DeliveryAddr: shutdownStartAddr(shutdown), + }) + + // Now that the channel is active, we'll launch a goroutine to + // watch for the final terminal state to send updates to the + // RPC client. We only need to do this if there's an RPC + // caller. + // + // TODO(roasbeef): make into a do once? otherwise new one for + // each RBF loop. + whenRpcShutdown(shutdown, func(req *htlcswitch.ChanClose) { + p.cg.WgAdd(1) + go func() { + defer p.cg.WgDone() + + p.observeRbfCloseUpdates(rbfCloser, req) + }() + }) }) return nil @@ -3662,8 +3997,14 @@ func (p *Brontide) handleLocalCloseReq(req *htlcswitch.ChanClose) { case contractcourt.CloseRegular: var err error switch { + // If this is the RBF coop state machine, then we'll instruct + // it to send the shutdown message. This also might be an RBF + // iteration, in which case we'll be obtaining a new + // transaction w/ a higher fee rate. case p.rbfCoopCloseAllowed(): - err = p.initAndStartRbfChanCloser(req, channel) + err = p.startRbfChanCloser( + newRPCShutdownInit(req), channel, + ) default: err = p.initNegotiateChanCloser(req, channel) } @@ -3815,7 +4156,7 @@ func (p *Brontide) finalizeChanClosure(chanCloser *chancloser.ChanCloser) { // Also clear the activeChanCloses map of this channel. cid := lnwire.NewChanIDFromOutPoint(chanPoint) - delete(p.activeChanCloses, cid) + delete(p.activeChanCloses, cid) // TODO(roasbeef): existing race // Next, we'll launch a goroutine which will request to be notified by // the ChainNotifier once the closure transaction obtains a single @@ -4260,11 +4601,12 @@ func (p *Brontide) StartTime() time.Time { func (p *Brontide) handleCloseMsg(msg *closeMsg) { link := p.fetchLinkFromKeyAndCid(msg.cid) - // We'll now fetch the matching closing state machine in order to continue, - // or finalize the channel closure process. + // We'll now fetch the matching closing state machine in order to + // continue, or finalize the channel closure process. chanCloserE, err := p.fetchActiveChanCloser(msg.cid) if err != nil { - // If the channel is not known to us, we'll simply ignore this message. + // If the channel is not known to us, we'll simply ignore this + // message. if err == ErrChannelNotFound { return } @@ -4618,6 +4960,25 @@ func (p *Brontide) addActiveChannel(c *lnpeer.NewChannel) error { "peer", chanPoint) } + // We're using the old co-op close, so we don't need to init the new + // RBF chan closer. + if !p.rbfCoopCloseAllowed() { + return nil + } + + // Now that the link has been added above, we'll also init an RBF chan + // closer for this channel, but only if the new close feature is + // negotiated. + // + // Creating this here ensures that any shutdown messages sent will be + // automatically routed by the msg router. + if _, err := p.initRbfChanCloser(lnChan); err != nil { + delete(p.activeChanCloses, chanID) + + return fmt.Errorf("unable to init RBF chan closer for new "+ + "chan: %w", err) + } + return nil } diff --git a/peer/chan_observer.go b/peer/chan_observer.go index 61dace50d..7570bcf4b 100644 --- a/peer/chan_observer.go +++ b/peer/chan_observer.go @@ -68,8 +68,6 @@ type chanObserver struct { // newChanObserver creates a new instance of a chanObserver from an active // channelView. -// -//nolint:unused func newChanObserver(chanView channelView, link linkController, linkNetwork linkNetworkController) *chanObserver { diff --git a/peer/daemon_adapters.go b/peer/daemon_adapters.go index 606f88b25..3c5bfe9f8 100644 --- a/peer/daemon_adapters.go +++ b/peer/daemon_adapters.go @@ -23,8 +23,6 @@ type MessageSender interface { // flexMessageSender is a message sender-like interface that is aware of // sync/async semantics, and is bound to a single peer. -// -//nolint:unused type flexMessageSender interface { // SendMessage sends a variadic number of high-priority messages to the // remote peer. The first argument denotes if the method should block @@ -36,16 +34,12 @@ type flexMessageSender interface { // peerMsgSender implements the MessageSender interface for a single peer. // It'll return an error if the target public isn't equal to public key of the // backing peer. -// -//nolint:unused type peerMsgSender struct { sender flexMessageSender peerPub btcec.PublicKey } // newPeerMsgSender creates a new instance of a peerMsgSender. -// -//nolint:unused func newPeerMsgSender(peerPub btcec.PublicKey, msgSender flexMessageSender) *peerMsgSender { @@ -59,8 +53,6 @@ func newPeerMsgSender(peerPub btcec.PublicKey, // // TODO(roasbeef): current impl bound to single peer, need server pointer // otherwise? -// -//nolint:unused func (p *peerMsgSender) SendMessages(pub btcec.PublicKey, msgs []lnwire.Message) error { From a9e538e52d208c20c04fbe3b091d83e5a89f74a8 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 5 Mar 2024 00:18:17 -0600 Subject: [PATCH 30/48] feature: add new NoRbfCoopClose option --- feature/manager.go | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/feature/manager.go b/feature/manager.go index 953883216..ad26ac8ab 100644 --- a/feature/manager.go +++ b/feature/manager.go @@ -73,6 +73,10 @@ type Config struct { // forwarding experimental endorsement. NoExperimentalEndorsement bool + // NoRbfCoopClose unsets any bits that signal support for using RBF for + // coop close. + NoRbfCoopClose bool + // CustomFeatures is a set of custom features to advertise in each // set. CustomFeatures map[Set][]lnwire.FeatureBit @@ -209,11 +213,13 @@ func newManager(cfg Config, desc setDesc) (*Manager, error) { raw.Unset(lnwire.SimpleTaprootOverlayChansOptional) raw.Unset(lnwire.SimpleTaprootOverlayChansRequired) } - if cfg.NoExperimentalEndorsement { raw.Unset(lnwire.ExperimentalEndorsementOptional) raw.Unset(lnwire.ExperimentalEndorsementRequired) } + if cfg.NoRbfCoopClose { + raw.Unset(lnwire.RbfCoopCloseOptionalStaging) + } for _, custom := range cfg.CustomFeatures[set] { if custom > set.Maximum() { From 47af913b4525c4d3e244b9876bd79e386c860a6d Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 5 Mar 2024 00:18:34 -0600 Subject: [PATCH 31/48] lncfg: add new protocol option - RbfCoopClose --- lncfg/protocol.go | 4 ++++ lncfg/protocol_integration.go | 4 ++++ sample-lnd.conf | 3 +++ 3 files changed, 11 insertions(+) diff --git a/lncfg/protocol.go b/lncfg/protocol.go index ed8d4578a..71b81fe75 100644 --- a/lncfg/protocol.go +++ b/lncfg/protocol.go @@ -35,6 +35,10 @@ type ProtocolOptions struct { // the experimental taproot overlay chan type. TaprootOverlayChans bool `long:"simple-taproot-overlay-chans" description:"if set, then lnd will create and accept requests for channels using the taproot overlay commitment type"` + // RbfCoopClose should be set if we want to signal that we support for + // the new experimental RBF coop close feature. + RbfCoopClose bool `long:"rbf-coop-close" description:"if set, then lnd will signal that it supports the new RBF based coop close protocol"` + // NoAnchors should be set if we don't want to support opening or accepting // channels having the anchor commitment type. NoAnchors bool `long:"no-anchors" description:"disable support for anchor commitments"` diff --git a/lncfg/protocol_integration.go b/lncfg/protocol_integration.go index a062c6697..c68d6ffe6 100644 --- a/lncfg/protocol_integration.go +++ b/lncfg/protocol_integration.go @@ -41,6 +41,10 @@ type ProtocolOptions struct { // TODO(halseth): transition itests to anchors instead! Anchors bool `long:"anchors" description:"enable support for anchor commitments"` + // RbfCoopClose should be set if we want to signal that we support for + // the new experimental RBF coop close feature. + RbfCoopClose bool `long:"rbf-coop-close" description:"if set, then lnd will signal that it supports the new RBF based coop close protocol"` + // ScriptEnforcedLease enables script enforced commitments for channel // leases. // diff --git a/sample-lnd.conf b/sample-lnd.conf index e00c80176..c2bc46a4c 100644 --- a/sample-lnd.conf +++ b/sample-lnd.conf @@ -1413,6 +1413,9 @@ ; Set to disable experimental endorsement signaling. ; protocol.no-experimental-endorsement=false +; Set to disable support for RBF based coop close. +; protocol.rbf-coop-close=false + ; Set to handle messages of a particular type that falls outside of the ; custom message number range (i.e. 513 is onion messages). Note that you can ; set this option as many times as you want to support more than one custom From 429bbf33ef6aad7fdb812ac7aca2f4ff60b63c7f Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 5 Mar 2024 00:19:19 -0600 Subject: [PATCH 32/48] server: thread through new NoRbfCoopClose option For now, we disallow the option to be used with the taproot chans option, as the new flow hasn't yet been updated for nonce usage. --- server.go | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/server.go b/server.go index 5d21e3e7e..c771ffc5c 100644 --- a/server.go +++ b/server.go @@ -612,6 +612,17 @@ func newServer(cfg *Config, listenAddrs []net.Addr, "aux controllers") } + // For now, the RBF coop close flag and the taproot channel type cannot + // be used together. + // + // TODO(roasbeef): fix + if cfg.ProtocolOptions.RbfCoopClose && + cfg.ProtocolOptions.TaprootChans { + + return nil, fmt.Errorf("RBF coop close and taproot " + + "channels cannot be used together") + } + //nolint:ll featureMgr, err := feature.NewManager(feature.Config{ NoTLVOnion: cfg.ProtocolOptions.LegacyOnion(), @@ -629,6 +640,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr, NoRouteBlinding: cfg.ProtocolOptions.NoRouteBlinding(), NoExperimentalEndorsement: cfg.ProtocolOptions.NoExperimentalEndorsement(), NoQuiescence: cfg.ProtocolOptions.NoQuiescence(), + NoRbfCoopClose: !cfg.ProtocolOptions.RbfCoopClose, }) if err != nil { return nil, err From 413cc3da35d5e05ef2a593cbc99a794f875a1bee Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 5 Mar 2024 00:20:33 -0600 Subject: [PATCH 33/48] itest: update async coop close itests to also use new rbf flow --- itest/lnd_coop_close_with_htlcs_test.go | 59 ++++++++++++++++++------- 1 file changed, 43 insertions(+), 16 deletions(-) diff --git a/itest/lnd_coop_close_with_htlcs_test.go b/itest/lnd_coop_close_with_htlcs_test.go index 8707fada7..0fc75e3a8 100644 --- a/itest/lnd_coop_close_with_htlcs_test.go +++ b/itest/lnd_coop_close_with_htlcs_test.go @@ -1,6 +1,7 @@ package itest import ( + "fmt" "testing" "github.com/btcsuite/btcd/btcutil" @@ -10,6 +11,7 @@ import ( "github.com/lightningnetwork/lnd/lnrpc/routerrpc" "github.com/lightningnetwork/lnd/lnrpc/walletrpc" "github.com/lightningnetwork/lnd/lntest" + "github.com/lightningnetwork/lnd/lntest/node" "github.com/lightningnetwork/lnd/lntest/wait" "github.com/lightningnetwork/lnd/lntypes" "github.com/lightningnetwork/lnd/lnwallet/chainfee" @@ -23,23 +25,48 @@ import ( // will have the receiver settle the invoice and observe that the channel gets // torn down after settlement. func testCoopCloseWithHtlcs(ht *lntest.HarnessTest) { - ht.Run("no restart", func(t *testing.T) { - tt := ht.Subtest(t) - coopCloseWithHTLCs(tt) - }) + rbfCoopFlags := []string{"--protocol.rbf-coop-close"} - ht.Run("with restart", func(t *testing.T) { - tt := ht.Subtest(t) - coopCloseWithHTLCsWithRestart(tt) - }) + for _, isRbf := range []bool{true, false} { + testName := fmt.Sprintf("no restart is_rbf=%v", isRbf) + ht.Run(testName, func(t *testing.T) { + tt := ht.Subtest(t) + + var flags []string + if isRbf { + flags = rbfCoopFlags + } + + alice := ht.NewNodeWithCoins("Alice", flags) + bob := ht.NewNodeWithCoins("bob", flags) + + coopCloseWithHTLCs(tt, alice, bob) + }) + } + + for _, isRbf := range []bool{true, false} { + testName := fmt.Sprintf("with restart is_rbf=%v", isRbf) + ht.Run(testName, func(t *testing.T) { + tt := ht.Subtest(t) + + var flags []string + if isRbf { + flags = rbfCoopFlags + } + + alice := ht.NewNodeWithCoins("Alice", flags) + bob := ht.NewNodeWithCoins("bob", flags) + + coopCloseWithHTLCsWithRestart(tt, alice, bob) + }) + } } // coopCloseWithHTLCs tests the basic coop close scenario which occurs when one // channel party initiates a channel shutdown while an HTLC is still pending on // the channel. -func coopCloseWithHTLCs(ht *lntest.HarnessTest) { - alice := ht.NewNodeWithCoins("Alice", nil) - bob := ht.NewNodeWithCoins("bob", nil) +func coopCloseWithHTLCs(ht *lntest.HarnessTest, alice, bob *node.HarnessNode) { + ht.ConnectNodes(alice, bob) // Here we set up a channel between Alice and Bob, beginning with a @@ -131,9 +158,9 @@ func coopCloseWithHTLCs(ht *lntest.HarnessTest) { // is still pending on the channel but this time it ensures that the shutdown // process continues as expected even if a channel re-establish happens after // one party has already initiated the shutdown. -func coopCloseWithHTLCsWithRestart(ht *lntest.HarnessTest) { - alice := ht.NewNodeWithCoins("Alice", nil) - bob := ht.NewNodeWithCoins("bob", nil) +func coopCloseWithHTLCsWithRestart(ht *lntest.HarnessTest, alice, + bob *node.HarnessNode) { + ht.ConnectNodes(alice, bob) // Open a channel between Alice and Bob with the balance split equally. @@ -219,8 +246,8 @@ func coopCloseWithHTLCsWithRestart(ht *lntest.HarnessTest) { }, defaultTimeout) require.NoError(ht, err) - // Wait for the close tx to be in the Mempool and then mine 6 blocks - // to confirm the close. + // Wait for the close tx to be in the Mempool and then mine 6 blocks to + // confirm the close. closingTx := ht.AssertClosingTxInMempool( chanPoint, lnrpc.CommitmentType_LEGACY, ) From 029fbd22fd5c1a743c96974b8b775ddcd4b90b1f Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:12:21 -0800 Subject: [PATCH 34/48] peer: make activeChanCloses a SyncMap This fixes some existing race conditions, as the `finalizeChanClosure` function was being called from outside the main event loop. --- peer/brontide.go | 50 +++++++++++++++++++++++++----------------------- 1 file changed, 26 insertions(+), 24 deletions(-) diff --git a/peer/brontide.go b/peer/brontide.go index eed66cfd0..437aefcfa 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -563,7 +563,7 @@ type Brontide struct { // cooperative channel closures. Any channel closing messages are directed // to one of these active state machines. Once the channel has been closed, // the state machine will be deleted from the map. - activeChanCloses map[lnwire.ChannelID]chanCloserFsm + activeChanCloses *lnutils.SyncMap[lnwire.ChannelID, chanCloserFsm] // localCloseChanReqs is a channel in which any local requests to close // a particular channel are sent over. @@ -649,8 +649,10 @@ func NewBrontide(cfg Config) *Brontide { newPendingChannel: make(chan *newChannelMsg, 1), removePendingChannel: make(chan *newChannelMsg), - activeMsgStreams: make(map[lnwire.ChannelID]*msgStream), - activeChanCloses: make(map[lnwire.ChannelID]chanCloserFsm), + activeMsgStreams: make(map[lnwire.ChannelID]*msgStream), + activeChanCloses: &lnutils.SyncMap[ + lnwire.ChannelID, chanCloserFsm, + ]{}, localCloseChanReqs: make(chan *htlcswitch.ChanClose), linkFailures: make(chan linkFailureReport), chanCloseMsgs: make(chan *closeMsg), @@ -1260,16 +1262,14 @@ func (p *Brontide) loadActiveChannels(chans []*channeldb.OpenChannel) ( lnChan.State().FundingOutpoint, ) - chanCloser := makeNegotiateCloser( + p.activeChanCloses.Store(chanID, makeNegotiateCloser( negotiateChanCloser, - ) - - p.activeChanCloses[chanID] = chanCloser + )) // Create the Shutdown message. shutdown, err := negotiateChanCloser.ShutdownChan() if err != nil { - delete(p.activeChanCloses, chanID) + p.activeChanCloses.Delete(chanID) shutdownInfoErr = err return @@ -1313,7 +1313,7 @@ func (p *Brontide) loadActiveChannels(chans []*channeldb.OpenChannel) ( // Creating this here ensures that any shutdown messages sent // will be automatically routed by the msg router. if _, err := p.initRbfChanCloser(lnChan); err != nil { - delete(p.activeChanCloses, chanID) + p.activeChanCloses.Delete(chanID) return nil, fmt.Errorf("unable to init RBF chan "+ "closer during peer connect: %w", err) @@ -3014,7 +3014,7 @@ func (p *Brontide) reenableActiveChannels() { func (p *Brontide) fetchActiveChanCloser(chanID lnwire.ChannelID) ( *chanCloserFsm, error) { - chanCloser, found := p.activeChanCloses[chanID] + chanCloser, found := p.activeChanCloses.Load(chanID) if found { // An entry will only be found if the closer has already been // created for a non-pending channel or for a channel that had @@ -3076,7 +3076,7 @@ func (p *Brontide) fetchActiveChanCloser(chanID lnwire.ChannelID) ( chanCloser = makeNegotiateCloser(negotiateChanCloser) - p.activeChanCloses[chanID] = chanCloser + p.activeChanCloses.Store(chanID, chanCloser) return &chanCloser, nil } @@ -3355,13 +3355,13 @@ func (p *Brontide) restartCoopClose(lnChan *lnwallet.LightningChannel) ( // This does not need a mutex even though it is in a different // goroutine since this is done before the channelManager goroutine is // created. - p.activeChanCloses[chanID] = makeNegotiateCloser(chanCloser) + p.activeChanCloses.Store(chanID, makeNegotiateCloser(chanCloser)) // Create the Shutdown message. shutdownMsg, err := chanCloser.ShutdownChan() if err != nil { p.log.Errorf("unable to create shutdown message: %v", err) - delete(p.activeChanCloses, chanID) + p.activeChanCloses.Delete(chanID) return nil, err } @@ -3454,8 +3454,8 @@ func (p *Brontide) initNegotiateChanCloser(req *htlcswitch.ChanClose, return fmt.Errorf("unable to make chan closer: %w", err) } - chanID := lnwire.NewChanIDFromOutPoint(*req.ChanPoint) - p.activeChanCloses[chanID] = makeNegotiateCloser(chanCloser) + chanID := lnwire.NewChanIDFromOutPoint(channel.ChannelPoint()) + p.activeChanCloses.Store(chanID, makeNegotiateCloser(chanCloser)) // Finally, we'll initiate the channel shutdown within the // chanCloser, and send the shutdown message to the remote @@ -3466,7 +3466,7 @@ func (p *Brontide) initNegotiateChanCloser(req *htlcswitch.ChanClose, // back to its normal state. defer channel.ResetState() - delete(p.activeChanCloses, chanID) + p.activeChanCloses.Delete(chanID) return fmt.Errorf("unable to shutdown channel: %w", err) } @@ -3585,10 +3585,13 @@ func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, } // TODO(roasbeef): race, make to sync map? + // other clean up? chanID := lnwire.NewChanIDFromOutPoint( *closeReq.ChanPoint, ) - delete(p.activeChanCloses, chanID) + p.activeChanCloses.Delete(chanID) + + return } case <-closeReq.Ctx.Done(): @@ -3657,7 +3660,7 @@ func (c *chanErrorReporter) ReportError(chanErr error) { } if _, err := c.peer.initRbfChanCloser(lnChan); err != nil { - delete(c.peer.activeChanCloses, c.chanID) + c.peer.activeChanCloses.Delete(c.chanID) c.peer.log.Errorf("unable to init RBF chan closer after "+ "error case: %v", err) @@ -3823,13 +3826,12 @@ func (p *Brontide) initRbfChanCloser( }) if err != nil { chanCloser.Stop() - delete(p.activeChanCloses, chanID) return nil, fmt.Errorf("unable to register endpoint for co-op "+ "close: %w", err) } - p.activeChanCloses[chanID] = makeRbfCloser(&chanCloser) + p.activeChanCloses.Store(chanID, makeRbfCloser(&chanCloser)) // Now that we've created the rbf closer state machine, we'll launch a // new goroutine to eventually send in the ChannelFlushed event once @@ -3923,7 +3925,7 @@ func (p *Brontide) startRbfChanCloser(shutdown shutdownInit, // Unlike the old negotiate chan closer, we'll always create the RBF // chan closer on startup, so we can skip init here. chanID := lnwire.NewChanIDFromOutPoint(channel.ChannelPoint()) - chanCloser, found := p.activeChanCloses[chanID] + chanCloser, found := p.activeChanCloses.Load(chanID) if !found { return fmt.Errorf("rbf can closer not found for channel %v", channel.ChannelPoint()) @@ -4156,7 +4158,7 @@ func (p *Brontide) finalizeChanClosure(chanCloser *chancloser.ChanCloser) { // Also clear the activeChanCloses map of this channel. cid := lnwire.NewChanIDFromOutPoint(chanPoint) - delete(p.activeChanCloses, cid) // TODO(roasbeef): existing race + p.activeChanCloses.Delete(cid) // TODO(roasbeef): existing race // Next, we'll launch a goroutine which will request to be notified by // the ChainNotifier once the closure transaction obtains a single @@ -4646,7 +4648,7 @@ func (p *Brontide) handleCloseMsg(msg *closeMsg) { chanCloser.CloseRequest().Err <- err } - delete(p.activeChanCloses, msg.cid) + p.activeChanCloses.Delete(msg.cid) p.Disconnect(err) } @@ -4973,7 +4975,7 @@ func (p *Brontide) addActiveChannel(c *lnpeer.NewChannel) error { // Creating this here ensures that any shutdown messages sent will be // automatically routed by the msg router. if _, err := p.initRbfChanCloser(lnChan); err != nil { - delete(p.activeChanCloses, chanID) + p.activeChanCloses.Delete(chanID) return fmt.Errorf("unable to init RBF chan closer for new "+ "chan: %w", err) From 282c50e444c39d0d3b856c1effd6d52c99cda145 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:13:23 -0800 Subject: [PATCH 35/48] peer: attempt to unregister endpoint before registering If we hit an error, we want to wipe the state machine state, which also includes removing the old endpoint. --- peer/brontide.go | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/peer/brontide.go b/peer/brontide.go index 437aefcfa..f50cba89b 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -3627,6 +3627,9 @@ func newChanErrorReporter(chanID lnwire.ChannelID, // // This is a part of the chancloser.ErrorReporter interface. func (c *chanErrorReporter) ReportError(chanErr error) { + c.peer.log.Errorf("coop close error for channel %v: %v", + c.chanID, chanErr) + var errMsg []byte if errors.Is(chanErr, chancloser.ErrInvalidStateTransition) { errMsg = []byte("unexpected protocol message") @@ -3822,6 +3825,8 @@ func (p *Brontide) initRbfChanCloser( // Finally, we'll register this new endpoint with the message router so // future co-op close messages are handled by this state machine. err = fn.MapOptionZ(p.msgRouter, func(r msgmux.Router) error { + _ = r.UnregisterEndpoint(chanCloser.Name()) + return r.RegisterEndpoint(&chanCloser) }) if err != nil { From b32f576aebda36712fe5f5514a2c513202247cfe Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:14:19 -0800 Subject: [PATCH 36/48] lnrpc: add fee rate and local close bool to PendingUpdate This'll allow us to notify the caller each time a new coop close transaction with a higher fee rate is signed. --- lnrpc/lightning.pb.go | 4551 +++++++++++++++++----------------- lnrpc/lightning.proto | 2 + lnrpc/lightning.swagger.json | 7 + 3 files changed, 2295 insertions(+), 2265 deletions(-) diff --git a/lnrpc/lightning.pb.go b/lnrpc/lightning.pb.go index 4d4577333..4d6982bd5 100644 --- a/lnrpc/lightning.pb.go +++ b/lnrpc/lightning.pb.go @@ -7209,8 +7209,10 @@ type PendingUpdate struct { sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields - Txid []byte `protobuf:"bytes,1,opt,name=txid,proto3" json:"txid,omitempty"` - OutputIndex uint32 `protobuf:"varint,2,opt,name=output_index,json=outputIndex,proto3" json:"output_index,omitempty"` + Txid []byte `protobuf:"bytes,1,opt,name=txid,proto3" json:"txid,omitempty"` + OutputIndex uint32 `protobuf:"varint,2,opt,name=output_index,json=outputIndex,proto3" json:"output_index,omitempty"` + FeePerVbyte int64 `protobuf:"varint,3,opt,name=fee_per_vbyte,json=feePerVbyte,proto3" json:"fee_per_vbyte,omitempty"` + LocalCloseTx bool `protobuf:"varint,4,opt,name=local_close_tx,json=localCloseTx,proto3" json:"local_close_tx,omitempty"` } func (x *PendingUpdate) Reset() { @@ -7259,6 +7261,20 @@ func (x *PendingUpdate) GetOutputIndex() uint32 { return 0 } +func (x *PendingUpdate) GetFeePerVbyte() int64 { + if x != nil { + return x.FeePerVbyte + } + return 0 +} + +func (x *PendingUpdate) GetLocalCloseTx() bool { + if x != nil { + return x.LocalCloseTx + } + return false +} + type InstantUpdate struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -19403,2296 +19419,2301 @@ var file_lightning_proto_rawDesc = []byte{ 0x74, 0x61, 0x6e, 0x74, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x14, 0x2e, 0x6c, 0x6e, 0x72, 0x70, 0x63, 0x2e, 0x49, 0x6e, 0x73, 0x74, 0x61, 0x6e, 0x74, 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"integer", "format": "int64" + }, + "fee_per_vbyte": { + "type": "string", + "format": "int64" + }, + "local_close_tx": { + "type": "boolean" } } }, From 81d34c4ac2ffc3e0fc173df4fd1dcd498acca2c4 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:14:52 -0800 Subject: [PATCH 37/48] peer+rpc: set new rbf coop close rbf update fields --- peer/brontide.go | 40 ++++++++++++++++++++++++++++++++++++---- rpcserver.go | 21 +++++++++++++++++---- 2 files changed, 53 insertions(+), 8 deletions(-) diff --git a/peer/brontide.go b/peer/brontide.go index f50cba89b..7023707d8 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -141,8 +141,22 @@ type closeMsg struct { // PendingUpdate describes the pending state of a closing channel. type PendingUpdate struct { - Txid []byte + // Txid is the txid of the closing transaction. + Txid []byte + + // OutputIndex is the output index of our output in the closing + // transaction. OutputIndex uint32 + + // FeePerVByte is an optional field, that is set only when the new RBF + // coop close flow is used. This indicates the new closing fee rate on + // the closing transaction. + FeePerVbyte fn.Option[chainfee.SatPerVByte] + + // IsLocalCloseTx is an optional field that indicates if this update is + // sent for our local close txn, or the close txn of the remote party. + // This is only set if the new RBF coop close flow is used. + IsLocalCloseTx fn.Option[bool] } // ChannelCloseUpdate contains the outcome of the close channel operation. @@ -3516,7 +3530,10 @@ func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, newStateChan := coopCloseStates.NewItemCreated.ChanOut() - var lastLocalTxid, lastRemoteTxid chainhash.Hash + var ( + lastLocalTxid, lastRemoteTxid chainhash.Hash + lastFeeRate chainfee.SatPerVByte + ) maybeNotifyTxBroadcast := func(state chancloser.AsymmetricPeerState, local bool) { @@ -3529,6 +3546,20 @@ func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, return } + // Only notify if the fee rate is greater. + if closePending.FeeRate <= lastFeeRate { + return + } + + lastFeeRate = closePending.FeeRate + + // We'll also only notify if the transaction was actually able + // to enter the mempool. + err := p.cfg.Wallet.PublishTransaction(closePending.CloseTx, "") + if err != nil { + return + } + lastTxid := lastLocalTxid if !local { lastTxid = lastRemoteTxid @@ -3540,10 +3571,11 @@ func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, closingTxid := closePending.CloseTx.TxHash() if closeReq != nil && closingTxid != lastTxid { closeReq.Updates <- &PendingUpdate{ - Txid: closingTxid[:], + Txid: closingTxid[:], + FeePerVbyte: fn.Some(closePending.FeeRate), + IsLocalCloseTx: fn.Some(local), } } - } // We'll consume each new incoming state to send out the appropriate diff --git a/rpcserver.go b/rpcserver.go index 525847f94..905ef9da1 100644 --- a/rpcserver.go +++ b/rpcserver.go @@ -2912,6 +2912,7 @@ func (r *rpcServer) CloseChannel(in *lnrpc.CloseChannelRequest, return err } } + out: for { select { @@ -2957,6 +2958,7 @@ out: h, _ := chainhash.NewHash(closeUpdate.ClosingTxid) rpcsLog.Infof("[closechannel] close completed: "+ "txid(%v)", h) + break out } @@ -3047,12 +3049,23 @@ func createRPCCloseUpdate( }, nil case *peer.PendingUpdate: + upd := &lnrpc.PendingUpdate{ + Txid: u.Txid, + OutputIndex: u.OutputIndex, + } + + // Potentially set the optional fields that are only set for + // the new RBF close flow. + u.IsLocalCloseTx.WhenSome(func(isLocal bool) { + upd.LocalCloseTx = isLocal + }) + u.FeePerVbyte.WhenSome(func(feeRate chainfee.SatPerVByte) { + upd.FeePerVbyte = int64(feeRate) + }) + return &lnrpc.CloseStatusUpdate{ Update: &lnrpc.CloseStatusUpdate_ClosePending{ - ClosePending: &lnrpc.PendingUpdate{ - Txid: u.Txid, - OutputIndex: u.OutputIndex, - }, + ClosePending: upd, }, }, nil } From 2899a757c49e97225ef631a60a1a7113109674e9 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:15:29 -0800 Subject: [PATCH 38/48] lntest: fix error message in WaitForChannelCloseEvent Resp is always nil, so we actually need to log event.Update here. --- lntest/harness_assertion.go | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lntest/harness_assertion.go b/lntest/harness_assertion.go index fb5b03990..326afe8b7 100644 --- a/lntest/harness_assertion.go +++ b/lntest/harness_assertion.go @@ -534,8 +534,8 @@ func (h HarnessTest) WaitForChannelCloseEvent( require.NoError(h, err) resp, ok := event.Update.(*lnrpc.CloseStatusUpdate_ChanClose) - require.Truef(h, ok, "expected channel open update, instead got %v", - resp) + require.Truef(h, ok, "expected channel close update, instead got %v", + event.Update) txid, err := chainhash.NewHash(resp.ChanClose.ClosingTxid) require.NoErrorf(h, err, "wrong format found in closing txid: %v", From fbc67f76104a6d5a1db8e94bc73133174c30b498 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 7 Mar 2024 20:16:26 -0800 Subject: [PATCH 39/48] lntest+itest: extend CloseChannelAssertPending In this commit, we extend `CloseChannelAssertPending` with new args that returns the raw close status update (as we have more things we'd like to assert), and also allows us to pass in a custom fee rate. --- itest/lnd_revocation_test.go | 26 ++++++++++++++++-------- itest/lnd_sweep_test.go | 11 ++++++---- itest/lnd_watchtower_test.go | 5 +++-- lntest/harness.go | 39 +++++++++++++++++++++++++++++------- 4 files changed, 60 insertions(+), 21 deletions(-) diff --git a/itest/lnd_revocation_test.go b/itest/lnd_revocation_test.go index 5074a3f02..c2508b885 100644 --- a/itest/lnd_revocation_test.go +++ b/itest/lnd_revocation_test.go @@ -109,7 +109,11 @@ func breachRetributionTestCase(ht *lntest.HarnessTest, // broadcasting his current channel state. This is actually the // commitment transaction of a prior *revoked* state, so he'll soon // feel the wrath of Carol's retribution. - _, breachTXID := ht.CloseChannelAssertPending(bob, chanPoint, true) + _, breachCloseUpd := ht.CloseChannelAssertPending(bob, chanPoint, true) + closeUpd := breachCloseUpd.GetClosePending() + require.NotNil(ht, closeUpd) + breachTXID, err := chainhash.NewHash(closeUpd.Txid) + require.NoError(ht, err) // Here, Carol sees Bob's breach transaction in the mempool, but is // waiting for it to confirm before continuing her retribution. We @@ -122,13 +126,13 @@ func breachRetributionTestCase(ht *lntest.HarnessTest, // update, then ensure that the closing transaction was included in the // block. block := ht.MineBlocksAndAssertNumTxes(1, 1)[0] - ht.AssertTxInBlock(block, breachTXID) + ht.AssertTxInBlock(block, *breachTXID) // Construct to_remote output which pays to Bob. Based on the output // ordering, the first output in this breach tx is the to_remote // output. toRemoteOp := wire.OutPoint{ - Hash: breachTXID, + Hash: *breachTXID, Index: 0, } @@ -151,7 +155,7 @@ func breachRetributionTestCase(ht *lntest.HarnessTest, // Assert that all the inputs of this transaction are spending outputs // generated by Bob's breach transaction above. for _, txIn := range justiceTx.TxIn { - require.Equal(ht, breachTXID, txIn.PreviousOutPoint.Hash, + require.Equal(ht, *breachTXID, txIn.PreviousOutPoint.Hash, "justice tx not spending commitment utxo") } @@ -296,7 +300,7 @@ func revokedCloseRetributionZeroValueRemoteOutputCase(ht *lntest.HarnessTest, // broadcasting her current channel state. This is actually the // commitment transaction of a prior *revoked* state, so she'll soon // feel the wrath of Dave's retribution. - stream, closeTxID := ht.CloseChannelAssertPending( + stream, closeUpdate := ht.CloseChannelAssertPending( carol, chanPoint, true, ) @@ -310,9 +314,11 @@ func revokedCloseRetributionZeroValueRemoteOutputCase(ht *lntest.HarnessTest, // state and continues exacting justice after his node restarts. ht.RestartNode(dave) + closeTxID := closeUpdate.GetClosePending().Txid + // The breachTXID should match the above closeTxID. breachTXID := ht.WaitForChannelCloseEvent(stream) - require.EqualValues(ht, breachTXID, closeTxID) + require.EqualValues(ht, breachTXID[:], closeTxID) // Construct to_local output which pays to Dave. Based on the output // ordering, the first output in this breach tx is the to_local @@ -543,9 +549,13 @@ func revokedCloseRetributionRemoteHodlCase(ht *lntest.HarnessTest, // broadcasting her current channel state. This is actually the // commitment transaction of a prior *revoked* state, so she'll soon // feel the wrath of Dave's retribution. - closeUpdates, closeTxID := ht.CloseChannelAssertPending( + closeUpdates, closeUpd := ht.CloseChannelAssertPending( carol, chanPoint, true, ) + pendingCloseUpd := closeUpd.GetClosePending() + require.NotNil(ht, pendingCloseUpd) + closeTxID, err := chainhash.NewHash(pendingCloseUpd.Txid) + require.NoError(ht, err) // Generate a single block to mine the breach transaction. block := ht.MineBlocksAndAssertNumTxes(1, 1)[0] @@ -593,7 +603,7 @@ func revokedCloseRetributionRemoteHodlCase(ht *lntest.HarnessTest, return nil, errNotFound } - err := wait.NoError(func() error { + err = wait.NoError(func() error { txid, err := findJusticeTx() if err != nil { return err diff --git a/itest/lnd_sweep_test.go b/itest/lnd_sweep_test.go index db3e2171e..afc237713 100644 --- a/itest/lnd_sweep_test.go +++ b/itest/lnd_sweep_test.go @@ -5,6 +5,7 @@ import ( "time" "github.com/btcsuite/btcd/btcutil" + "github.com/btcsuite/btcd/chaincfg/chainhash" "github.com/btcsuite/btcd/wire" "github.com/lightningnetwork/lnd/contractcourt" "github.com/lightningnetwork/lnd/fn/v2" @@ -1963,8 +1964,8 @@ func testBumpForceCloseFee(ht *lntest.HarnessTest) { ht.FundCoinsP2TR(btcutil.SatoshiPerBitcoin, alice) // Alice force closes the channel which has no HTLCs at stake. - _, closingTxID := ht.CloseChannelAssertPending(alice, chanPoint, true) - require.NotNil(ht, closingTxID) + _, closeUpdates := ht.CloseChannelAssertPending(alice, chanPoint, true) + require.NotNil(ht, closeUpdates) // Alice should see one waiting close channel. ht.AssertNumWaitingClose(alice, 1) @@ -1974,8 +1975,10 @@ func testBumpForceCloseFee(ht *lntest.HarnessTest) { ht.AssertNumPendingSweeps(alice, 2) // Calculate the commitment tx fee rate. - closingTx := ht.AssertTxInMempool(closingTxID) - require.NotNil(ht, closingTx) + pendingClose := closeUpdates.GetClosePending() + closeTxid, err := chainhash.NewHash(pendingClose.Txid) + require.NoError(ht, err) + closingTx := ht.AssertTxInMempool(*closeTxid) // The default commitment fee for anchor channels is capped at 2500 // sat/kw but there might be some inaccuracies because of the witness diff --git a/itest/lnd_watchtower_test.go b/itest/lnd_watchtower_test.go index 28bb65a63..1b63f9063 100644 --- a/itest/lnd_watchtower_test.go +++ b/itest/lnd_watchtower_test.go @@ -491,7 +491,7 @@ func testRevokedCloseRetributionAltruistWatchtowerCase(ht *lntest.HarnessTest, // broadcasting his current channel state. This is actually the // commitment transaction of a prior *revoked* state, so he'll soon // feel the wrath of Dave's retribution. - closeUpdates, closeTxID := ht.CloseChannelAssertPending( + closeUpdates, pendingClose := ht.CloseChannelAssertPending( carol, chanPoint, true, ) @@ -504,7 +504,8 @@ func testRevokedCloseRetributionAltruistWatchtowerCase(ht *lntest.HarnessTest, ht.AssertTxInBlock(block, breachTXID) // The breachTXID should match the above closeTxID. - require.EqualValues(ht, breachTXID, closeTxID) + closeTxID := pendingClose.GetClosePending().Txid + require.EqualValues(ht, breachTXID[:], closeTxID) // Query the mempool for Dave's justice transaction, this should be // broadcast as Carol's contract breaching transaction gets confirmed diff --git a/lntest/harness.go b/lntest/harness.go index 6df1d9ffa..f7a8eec65 100644 --- a/lntest/harness.go +++ b/lntest/harness.go @@ -1208,14 +1208,40 @@ func (h *HarnessTest) OpenChannelAssertErr(srcNode, destNode *node.HarnessNode, "error returned, want %v, got %v", expectedErr, err) } +// closeChannelOpts holds the options for closing a channel. +type closeChannelOpts struct { + feeRate fn.Option[chainfee.SatPerVByte] +} + +// CloseChanOpt is a functional option to modify the way we close a channel. +type CloseChanOpt func(*closeChannelOpts) + +// WithCoopCloseFeeRate is a functional option to set the fee rate for a coop +// close attempt. +func WithCoopCloseFeeRate(rate chainfee.SatPerVByte) CloseChanOpt { + return func(o *closeChannelOpts) { + o.feeRate = fn.Some(rate) + } +} + +// defaultCloseOpts returns the set of default close options. +func defaultCloseOpts() *closeChannelOpts { + return &closeChannelOpts{} +} + // CloseChannelAssertPending attempts to close the channel indicated by the // passed channel point, initiated by the passed node. Once the CloseChannel // rpc is called, it will consume one event and assert it's a close pending // event. In addition, it will check that the closing tx can be found in the // mempool. func (h *HarnessTest) CloseChannelAssertPending(hn *node.HarnessNode, - cp *lnrpc.ChannelPoint, - force bool) (rpc.CloseChanClient, chainhash.Hash) { + cp *lnrpc.ChannelPoint, force bool, + opts ...CloseChanOpt) (rpc.CloseChanClient, *lnrpc.CloseStatusUpdate) { + + closeOpts := defaultCloseOpts() + for _, optFunc := range opts { + optFunc(closeOpts) + } // Calls the rpc to close the channel. closeReq := &lnrpc.CloseChannelRequest{ @@ -1224,10 +1250,9 @@ func (h *HarnessTest) CloseChannelAssertPending(hn *node.HarnessNode, NoWait: true, } - // For coop close, we use a default confg target of 6. - if !force { - closeReq.TargetConf = 6 - } + closeOpts.feeRate.WhenSome(func(feeRate chainfee.SatPerVByte) { + closeReq.SatPerVbyte = uint64(feeRate) + }) var ( stream rpc.CloseChanClient @@ -1260,7 +1285,7 @@ func (h *HarnessTest) CloseChannelAssertPending(hn *node.HarnessNode, // Assert the closing tx is in the mempool. h.miner.AssertTxInMempool(*closeTxid) - return stream, *closeTxid + return stream, event } // CloseChannel attempts to coop close a non-anchored channel identified by the From 80b48fb49b1f894fd582ddf89782c71960482c8a Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Fri, 7 Feb 2025 18:25:07 -0800 Subject: [PATCH 40/48] peer: update rbf close client logic w/ error and iteration awareness We'll properly handle a protocol error due to user input by halting, and sending the error back to the user. When a user goes to issue a new update, based on which state we're in, we'll either kick off the shutdown, or attempt a new offer. This matches the new spec update where we'll only send `Shutdown` once per connection. --- lnwallet/chancloser/rbf_coop_states.go | 4 + peer/brontide.go | 200 +++++++++++++++++-------- 2 files changed, 141 insertions(+), 63 deletions(-) diff --git a/lnwallet/chancloser/rbf_coop_states.go b/lnwallet/chancloser/rbf_coop_states.go index a195334f2..86de10c9f 100644 --- a/lnwallet/chancloser/rbf_coop_states.go +++ b/lnwallet/chancloser/rbf_coop_states.go @@ -959,3 +959,7 @@ type RbfState = protofsm.State[ProtocolEvent, *Environment] // RbfEvent is a type alias for the event type of the RBF channel closer. type RbfEvent = protofsm.EmittedEvent[ProtocolEvent] + +// RbfStateSub is a type alias for the state subscription type of the RBF chan +// closer. +type RbfStateSub = protofsm.StateSubscriber[ProtocolEvent, *Environment] diff --git a/peer/brontide.go b/peer/brontide.go index 7023707d8..09c3018bd 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -1338,7 +1338,8 @@ func (p *Brontide) loadActiveChannels(chans []*channeldb.OpenChannel) ( // continue the old shutdown flow. restartShutdown := func(s channeldb.ShutdownInfo) error { return p.startRbfChanCloser( - newRestartShutdownInit(s), lnChan, + newRestartShutdownInit(s), + lnChan.ChannelPoint(), ) } err = fn.MapOptionZ(shutdownInfo, restartShutdown) @@ -3332,7 +3333,7 @@ func (p *Brontide) restartCoopClose(lnChan *lnwallet.LightningChannel) ( )(shutdownInfo) err = p.startRbfChanCloser( - fn.FlattenOption(shutdownDesc), lnChan, + fn.FlattenOption(shutdownDesc), lnChan.ChannelPoint(), ) return nil, err @@ -3366,9 +3367,6 @@ func (p *Brontide) restartCoopClose(lnChan *lnwallet.LightningChannel) ( return nil, fmt.Errorf("unable to create chan closer") } - // This does not need a mutex even though it is in a different - // goroutine since this is done before the channelManager goroutine is - // created. p.activeChanCloses.Store(chanID, makeNegotiateCloser(chanCloser)) // Create the Shutdown message. @@ -3523,20 +3521,40 @@ func chooseAddr(addr lnwire.DeliveryAddress) fn.Option[lnwire.DeliveryAddress] { // indicate that a new txid has been broadcasted, or the channel fully closed // on chain. func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, - closeReq *htlcswitch.ChanClose) { - - coopCloseStates := chanCloser.RegisterStateEvents() - defer chanCloser.RemoveStateSub(coopCloseStates) + closeReq *htlcswitch.ChanClose, + coopCloseStates chancloser.RbfStateSub) { newStateChan := coopCloseStates.NewItemCreated.ChanOut() + defer chanCloser.RemoveStateSub(coopCloseStates) var ( - lastLocalTxid, lastRemoteTxid chainhash.Hash - lastFeeRate chainfee.SatPerVByte + lastTxids lntypes.Dual[chainhash.Hash] + lastFeeRates lntypes.Dual[chainfee.SatPerVByte] ) maybeNotifyTxBroadcast := func(state chancloser.AsymmetricPeerState, - local bool) { + party lntypes.ChannelParty) { + + // First, check to see if we have an error to report to the + // caller. If so, then we''ll return that error and exit, as the + // stream will exit as well. + if closeErr, ok := state.(*chancloser.CloseErr); ok { + // We hit an error during the last state transition, so + // we'll extract the error then send it to the + // user. + err := closeErr.Err() + + peerLog.Warnf("ChannelPoint(%v): encountered close "+ + "err: %v", closeReq.ChanPoint, err) + + select { + case closeReq.Err <- err: + case <-closeReq.Ctx.Done(): + case <-p.cg.Done(): + } + + return + } closePending, ok := state.(*chancloser.ClosePending) @@ -3547,37 +3565,50 @@ func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, } // Only notify if the fee rate is greater. - if closePending.FeeRate <= lastFeeRate { + newFeeRate := closePending.FeeRate + lastFeeRate := lastFeeRates.GetForParty(party) + if newFeeRate <= lastFeeRate { + peerLog.Debugf("ChannelPoint(%v): remote party made "+ + "update for fee rate %v, but we already have "+ + "a higher fee rate of %v", closeReq.ChanPoint, + newFeeRate, lastFeeRate) + return } - lastFeeRate = closePending.FeeRate + feeRate := closePending.FeeRate + lastFeeRates.SetForParty(party, feeRate) - // We'll also only notify if the transaction was actually able - // to enter the mempool. - err := p.cfg.Wallet.PublishTransaction(closePending.CloseTx, "") - if err != nil { - return - } - - lastTxid := lastLocalTxid - if !local { - lastTxid = lastRemoteTxid - } - - // Otherwise, we'll have a txid that we can use to notify the - // client, but only if it's different from the last one we - // sent. + // At this point, we'll have a txid that we can use to notify + // the client, but only if it's different from the last one we + // sent. If the user attempted to bump, but was rejected due to + // RBF, then we'll send a redundant update. closingTxid := closePending.CloseTx.TxHash() + lastTxid := lastTxids.GetForParty(party) if closeReq != nil && closingTxid != lastTxid { - closeReq.Updates <- &PendingUpdate{ - Txid: closingTxid[:], - FeePerVbyte: fn.Some(closePending.FeeRate), - IsLocalCloseTx: fn.Some(local), + select { + case closeReq.Updates <- &PendingUpdate{ + Txid: closingTxid[:], + FeePerVbyte: fn.Some(closePending.FeeRate), + IsLocalCloseTx: fn.Some( + party == lntypes.Local, + ), + }: + + case <-closeReq.Ctx.Done(): + return + + case <-p.cg.Done(): + return } } + + lastTxids.SetForParty(party, closingTxid) } + peerLog.Infof("Observing RBF close updates for channel %v", + closeReq.ChanPoint) + // We'll consume each new incoming state to send out the appropriate // RPC update. for { @@ -3595,11 +3626,11 @@ func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, // changed. maybeNotifyTxBroadcast( peerState.GetForParty(lntypes.Local), - true, + lntypes.Local, ) maybeNotifyTxBroadcast( peerState.GetForParty(lntypes.Remote), - false, + lntypes.Remote, ) // Otherwise, if we're transition to CloseFin, then we @@ -3615,9 +3646,6 @@ func (p *Brontide) observeRbfCloseUpdates(chanCloser *chancloser.RbfChanCloser, Success: true, } } - - // TODO(roasbeef): race, make to sync map? - // other clean up? chanID := lnwire.NewChanIDFromOutPoint( *closeReq.ChanPoint, ) @@ -3791,7 +3819,9 @@ func (p *Brontide) initRbfChanCloser( peerPub := *p.IdentityKey() - msgMapper := chancloser.NewRbfMsgMapper(uint32(startingHeight), chanID, peerPub) + msgMapper := chancloser.NewRbfMsgMapper( + uint32(startingHeight), chanID, peerPub, + ) initialState := chancloser.ChannelActive{} @@ -3927,9 +3957,9 @@ func shutdownStartAddr(s shutdownInit) fn.Option[lnwire.DeliveryAddress] { return fn.FlattenOption(addrOpt) } -// whenRpcShutdown registers a callback to be executed when the shutdown init +// whenRPCShutdown registers a callback to be executed when the shutdown init // type is and RPC request. -func whenRpcShutdown(s shutdownInit, f func(r *htlcswitch.ChanClose)) { +func whenRPCShutdown(s shutdownInit, f func(r *htlcswitch.ChanClose)) { s.WhenSome(func(init fn.Either[*htlcswitch.ChanClose, channeldb.ShutdownInfo]) { @@ -3957,15 +3987,15 @@ func newRPCShutdownInit(req *htlcswitch.ChanClose) shutdownInit { // // TODO(roasbeef): just accept the two shutdown pointer params instead?? func (p *Brontide) startRbfChanCloser(shutdown shutdownInit, - channel *lnwallet.LightningChannel) error { + chanPoint wire.OutPoint) error { // Unlike the old negotiate chan closer, we'll always create the RBF // chan closer on startup, so we can skip init here. - chanID := lnwire.NewChanIDFromOutPoint(channel.ChannelPoint()) + chanID := lnwire.NewChanIDFromOutPoint(chanPoint) chanCloser, found := p.activeChanCloses.Load(chanID) if !found { return fmt.Errorf("rbf can closer not found for channel %v", - channel.ChannelPoint()) + chanPoint) } defaultFeePerKw, err := shutdownStartFeeRate( @@ -3981,32 +4011,76 @@ func (p *Brontide) startRbfChanCloser(shutdown shutdownInit, chanCloser.WhenRight(func(rbfCloser *chancloser.RbfChanCloser) { peerLog.Infof("ChannelPoint(%v): rbf-coop close requested, "+ - "sending shutdown", channel.ChannelPoint()) + "sending shutdown", chanPoint) - // With the chan closer created, we'll now kick off the co-op - // close process by instructing it to send a shutdown message - // to the remote party. - ctx := context.Background() - rbfCloser.SendEvent(ctx, &chancloser.SendShutdown{ - IdealFeeRate: defaultFeePerKw.FeePerVByte(), - DeliveryAddr: shutdownStartAddr(shutdown), - }) + rbfState, err := rbfCloser.CurrentState() + if err != nil { + peerLog.Warnf("ChannelPoint(%v): unable to get "+ + "current state for rbf-coop close: %v", + chanPoint, err) + + return + } + + coopCloseStates := rbfCloser.RegisterStateEvents() + + // Before we send our event below, we'll launch a goroutine to + // watch for the final terminal state to send updates to the RPC + // client. We only need to do this if there's an RPC caller. + var rpcShutdown bool + whenRPCShutdown(shutdown, func(req *htlcswitch.ChanClose) { + rpcShutdown = true - // Now that the channel is active, we'll launch a goroutine to - // watch for the final terminal state to send updates to the - // RPC client. We only need to do this if there's an RPC - // caller. - // - // TODO(roasbeef): make into a do once? otherwise new one for - // each RBF loop. - whenRpcShutdown(shutdown, func(req *htlcswitch.ChanClose) { p.cg.WgAdd(1) go func() { defer p.cg.WgDone() - p.observeRbfCloseUpdates(rbfCloser, req) + p.observeRbfCloseUpdates( + rbfCloser, req, coopCloseStates, + ) }() }) + + if !rpcShutdown { + defer rbfCloser.RemoveStateSub(coopCloseStates) + } + + ctx, _ := p.cg.Create(context.Background()) + feeRate := defaultFeePerKw.FeePerVByte() + + // Depending on the state of the state machine, we'll either + // kick things off by sending shutdown, or attempt to send a new + // offer to the remote party. + switch rbfState.(type) { + // The channel is still active, so we'll now kick off the co-op + // close process by instructing it to send a shutdown message to + // the remote party. + case *chancloser.ChannelActive: + rbfCloser.SendEvent( + context.Background(), + &chancloser.SendShutdown{ + IdealFeeRate: feeRate, + DeliveryAddr: shutdownStartAddr( + shutdown, + ), + }, + ) + + // If we haven't yet sent an offer (didn't have enough funds at + // the prior fee rate), or we've sent an offer, then we'll + // trigger a new offer event. + case *chancloser.ClosingNegotiation: + event := chancloser.ProtocolEvent( + &chancloser.SendOfferEvent{ + TargetFeeRate: feeRate, + }, + ) + rbfCloser.SendEvent(ctx, event) + + default: + peerLog.Warnf("ChannelPoint(%v): unexpected state "+ + "for rbf-coop close: %T", chanPoint, rbfState) + } }) return nil @@ -4042,7 +4116,7 @@ func (p *Brontide) handleLocalCloseReq(req *htlcswitch.ChanClose) { // transaction w/ a higher fee rate. case p.rbfCoopCloseAllowed(): err = p.startRbfChanCloser( - newRPCShutdownInit(req), channel, + newRPCShutdownInit(req), channel.ChannelPoint(), ) default: err = p.initNegotiateChanCloser(req, channel) From 3a18bf088c6862d6800e56ad2aa1fa4226f6f7a8 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Fri, 7 Feb 2025 18:25:49 -0800 Subject: [PATCH 41/48] multi: enable RBF co-op bumps after reconnection In this commit, we alter the existing co-op close flow to enable RBF bumps after re connection. With the new RBF close flow, it's possible that after a success round _and_ a re connection, either side wants to do another fee bump. Typically we route these requests through the switch, but in this case, the link no longer exists in the switch, so any requests to fee bump again would find that the link doesn't exist. In this commit, we implement a work around wherein if we have an RBF chan closer active, and the link isn't in the switch, then we just route the request directly to the chan closer via the peer. Once we have the chan closer, we can use the exact same flow as prior. --- peer/brontide.go | 59 +++++++++++++++++++++++++++++++++ rpcserver.go | 57 +++++++++++++++++++++++++++----- server.go | 85 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 192 insertions(+), 9 deletions(-) diff --git a/peer/brontide.go b/peer/brontide.go index 09c3018bd..24147663c 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -5234,3 +5234,62 @@ func (p *Brontide) scaleTimeout(timeout time.Duration) time.Duration { return timeout } + +// CoopCloseUpdates is a struct used to communicate updates for an active close +// to the caller. +type CoopCloseUpdates struct { + UpdateChan chan interface{} + + ErrChan chan error +} + +// ChanHasRbfCoopCloser returns true if the channel as identifier by the channel +// point has an active RBF chan closer. +func (p *Brontide) ChanHasRbfCoopCloser(chanPoint wire.OutPoint) bool { + chanID := lnwire.NewChanIDFromOutPoint(chanPoint) + chanCloser, found := p.activeChanCloses.Load(chanID) + if !found { + return false + } + + return chanCloser.IsRight() +} + +// TriggerCoopCloseRbfBump given a chan ID, and the params needed to trigger a +// new RBF co-op close update, a bump is attempted. A channel used for updates, +// along with one used to o=communicate any errors is returned. If no chan +// closer is found, then false is returned for the second argument. +func (p *Brontide) TriggerCoopCloseRbfBump(ctx context.Context, + chanPoint wire.OutPoint, feeRate chainfee.SatPerKWeight, + deliveryScript lnwire.DeliveryAddress) (*CoopCloseUpdates, error) { + + // If RBF coop close isn't permitted, then we'll an error. + if !p.rbfCoopCloseAllowed() { + return nil, fmt.Errorf("rbf coop close not enabled for " + + "channel") + } + + closeUpdates := &CoopCloseUpdates{ + UpdateChan: make(chan interface{}, 1), + ErrChan: make(chan error, 1), + } + + // We'll re-use the existing switch struct here, even though we're + // bypassing the switch entirely. + closeReq := htlcswitch.ChanClose{ + CloseType: contractcourt.CloseRegular, + ChanPoint: &chanPoint, + TargetFeePerKw: feeRate, + DeliveryScript: deliveryScript, + Updates: closeUpdates.UpdateChan, + Err: closeUpdates.ErrChan, + Ctx: ctx, + } + + err := p.startRbfChanCloser(newRPCShutdownInit(&closeReq), chanPoint) + if err != nil { + return nil, err + } + + return closeUpdates, nil +} diff --git a/rpcserver.go b/rpcserver.go index 905ef9da1..d498d3b98 100644 --- a/rpcserver.go +++ b/rpcserver.go @@ -2801,14 +2801,33 @@ func (r *rpcServer) CloseChannel(in *lnrpc.CloseChannelRequest, } } + var ( + chanInSwitch = true + chanHasRbfCloser = r.server.ChanHasRbfCoopCloser( + channel.IdentityPub, *chanPoint, + ) + ) + // If the link is not known by the switch, we cannot gracefully close // the channel. channelID := lnwire.NewChanIDFromOutPoint(*chanPoint) + if _, err := r.server.htlcSwitch.GetLink(channelID); err != nil { - rpcsLog.Debugf("Trying to non-force close offline channel with "+ - "chan_point=%v", chanPoint) - return fmt.Errorf("unable to gracefully close channel while peer "+ - "is offline (try force closing it instead): %v", err) + chanInSwitch = false + + // The channel isn't in the switch, but if there's an + // active chan closer for the channel, and it's of the + // RBF variant, then we can actually bypass the switch. + // Otherwise, we'll return an error. + if !chanHasRbfCloser { + rpcsLog.Debugf("Trying to non-force close "+ + "offline channel with chan_point=%v", + chanPoint) + + return fmt.Errorf("unable to gracefully close "+ + "channel while peer is offline (try "+ + "force closing it instead): %v", err) + } } // Keep the old behavior prior to 0.18.0 - when the user @@ -2886,11 +2905,31 @@ func (r *rpcServer) CloseChannel(in *lnrpc.CloseChannelRequest, feeRate) } - updateChan, errChan = r.server.htlcSwitch.CloseLink( - updateStream.Context(), chanPoint, - contractcourt.CloseRegular, feeRate, maxFee, - deliveryScript, - ) + if chanHasRbfCloser && !chanInSwitch { + rpcsLog.Infof("Bypassing Switch to do fee bump "+ + "for ChannelPoint(%v)", chanPoint) + + closeUpdates, err := r.server.AttemptRBFCloseUpdate( + updateStream.Context(), *chanPoint, feeRate, + deliveryScript, + ) + if err != nil { + return fmt.Errorf("unable to do RBF close "+ + "update: %w", err) + } + + updateChan = closeUpdates.UpdateChan + errChan = closeUpdates.ErrChan + } else { + maxFee := chainfee.SatPerKVByte( + in.MaxFeePerVbyte * 1000, + ).FeePerKWeight() + updateChan, errChan = r.server.htlcSwitch.CloseLink( + updateStream.Context(), chanPoint, + contractcourt.CloseRegular, feeRate, maxFee, + deliveryScript, + ) + } } // If the user doesn't want to wait for the txid to come back then we diff --git a/server.go b/server.go index c771ffc5c..ad521cd67 100644 --- a/server.go +++ b/server.go @@ -5427,3 +5427,88 @@ func (s *server) getStartingBeat() (*chainio.Beat, error) { return beat, nil } + +// ChanHasRbfCoopCloser returns true if the channel as identifier by the channel +// point has an active RBF chan closer. +func (s *server) ChanHasRbfCoopCloser(peerPub *btcec.PublicKey, + chanPoint wire.OutPoint) bool { + + pubBytes := peerPub.SerializeCompressed() + + s.mu.RLock() + targetPeer, ok := s.peersByPub[string(pubBytes)] + s.mu.RUnlock() + if !ok { + return false + } + + return targetPeer.ChanHasRbfCoopCloser(chanPoint) +} + +// attemptCoopRbfFeeBump attempts to look up the active chan closer for a +// channel given the outpoint. If found, we'll attempt to do a fee bump, +// returning channels used for updates. If the channel isn't currently active +// (p2p connection established), then his function will return an error. +func (s *server) attemptCoopRbfFeeBump(ctx context.Context, + chanPoint wire.OutPoint, feeRate chainfee.SatPerKWeight, + deliveryScript lnwire.DeliveryAddress) (*peer.CoopCloseUpdates, error) { + + // First, we'll attempt to look up the channel based on it's + // ChannelPoint. + channel, err := s.chanStateDB.FetchChannel(chanPoint) + if err != nil { + return nil, fmt.Errorf("unable to fetch channel: %w", err) + } + + // From the channel, we can now get the pubkey of the peer, then use + // that to eventually get the chan closer. + peerPub := channel.IdentityPub.SerializeCompressed() + + // Now that we have the peer pub, we can look up the peer itself. + s.mu.RLock() + targetPeer, ok := s.peersByPub[string(peerPub)] + s.mu.RUnlock() + if !ok { + return nil, fmt.Errorf("peer for ChannelPoint(%v) is "+ + "not online", chanPoint) + } + + closeUpdates, err := targetPeer.TriggerCoopCloseRbfBump( + ctx, chanPoint, feeRate, deliveryScript, + ) + if err != nil { + return nil, fmt.Errorf("unable to trigger coop rbf fee bump: "+ + "%w", err) + } + + return closeUpdates, nil +} + +// AttemptRBFCloseUpdate attempts to trigger a new RBF iteration for a co-op +// close update. This route it to be used only if the target channel in question +// is no longer active in the link. This can happen when we restart while we +// already have done a single RBF co-op close iteration. +func (s *server) AttemptRBFCloseUpdate(ctx context.Context, + chanPoint wire.OutPoint, feeRate chainfee.SatPerKWeight, + deliveryScript lnwire.DeliveryAddress) (*peer.CoopCloseUpdates, error) { + + // If the channel is present in the switch, then the request should flow + // through the switch instead. + chanID := lnwire.NewChanIDFromOutPoint(chanPoint) + if _, err := s.htlcSwitch.GetLink(chanID); err == nil { + return nil, fmt.Errorf("ChannelPoint(%v) is active in link, "+ + "invalid request", chanPoint) + } + + // At this point, we know that the channel isn't present in the link, so + // we'll check to see if we have an entry in the active chan closer map. + updates, err := s.attemptCoopRbfFeeBump( + ctx, chanPoint, feeRate, deliveryScript, + ) + if err != nil { + return nil, fmt.Errorf("unable to attempt coop rbf fee bump "+ + "ChannelPoint(%v)", chanPoint) + } + + return updates, nil +} From 971ac5a14da80821bb73f74475242253c9fe0664 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Fri, 7 Feb 2025 18:26:52 -0800 Subject: [PATCH 42/48] itest: add new RBF coop close itest The itest has both sides try to close multiple times, each time with increasing fee rates. We also test the reconnection case, bad RBF updates, and instances where the local party can't actually pay for fees. --- itest/list_on_test.go | 4 + itest/lnd_coop_close_rbf_test.go | 133 ++++++++++++++++++++++++ itest/lnd_coop_close_with_htlcs_test.go | 1 - itest/lnd_sweep_test.go | 1 + lntest/harness.go | 95 ++++++++++++++--- 5 files changed, 218 insertions(+), 16 deletions(-) create mode 100644 itest/lnd_coop_close_rbf_test.go diff --git a/itest/list_on_test.go b/itest/list_on_test.go index e1160ed0f..07f2da997 100644 --- a/itest/list_on_test.go +++ b/itest/list_on_test.go @@ -678,6 +678,10 @@ var allTestCases = []*lntest.TestCase{ Name: "access perm", TestFunc: testAccessPerm, }, + { + Name: "rbf coop close", + TestFunc: testCoopCloseRbf, + }, } // appendPrefixed is used to add a prefix to each test name in the subtests diff --git a/itest/lnd_coop_close_rbf_test.go b/itest/lnd_coop_close_rbf_test.go new file mode 100644 index 000000000..870334648 --- /dev/null +++ b/itest/lnd_coop_close_rbf_test.go @@ -0,0 +1,133 @@ +package itest + +import ( + "github.com/btcsuite/btcd/btcutil" + "github.com/lightningnetwork/lnd/lntest" + "github.com/lightningnetwork/lnd/lnwallet/chainfee" + "github.com/stretchr/testify/require" +) + +func testCoopCloseRbf(ht *lntest.HarnessTest) { + rbfCoopFlags := []string{"--protocol.rbf-coop-close"} + + // Set the fee estimate to 1sat/vbyte. This ensures that our manually + // initiated RBF attempts will always be successful. + ht.SetFeeEstimate(250) + ht.SetFeeEstimateWithConf(250, 6) + + // To kick things off, we'll create two new nodes, then fund them with + // enough coins to make a 50/50 channel. + cfgs := [][]string{rbfCoopFlags, rbfCoopFlags} + params := lntest.OpenChannelParams{ + Amt: btcutil.Amount(1000000), + PushAmt: btcutil.Amount(1000000 / 2), + } + chanPoints, nodes := ht.CreateSimpleNetwork(cfgs, params) + alice, bob := nodes[0], nodes[1] + chanPoint := chanPoints[0] + + // Now that both sides are active with a funded channel, we can kick + // off the test. + // + // To start, we'll have Alice try to close the channel, with a fee rate + // of 5 sat/byte. + aliceFeeRate := chainfee.SatPerVByte(5) + aliceCloseStream, aliceCloseUpdate := ht.CloseChannelAssertPending( + alice, chanPoint, false, + lntest.WithCoopCloseFeeRate(aliceFeeRate), + lntest.WithLocalTxNotify(), + ) + + // Confirm that this new update was at 5 sat/vb. + alicePendingUpdate := aliceCloseUpdate.GetClosePending() + require.NotNil(ht, aliceCloseUpdate) + require.Equal( + ht, int64(aliceFeeRate), alicePendingUpdate.FeePerVbyte, + ) + require.True(ht, alicePendingUpdate.LocalCloseTx) + + // Now, we'll have Bob attempt to RBF the close transaction with a + // higher fee rate, double that of Alice's. + bobFeeRate := aliceFeeRate * 2 + bobCloseStream, bobCloseUpdate := ht.CloseChannelAssertPending( + bob, chanPoint, false, lntest.WithCoopCloseFeeRate(bobFeeRate), + lntest.WithLocalTxNotify(), + ) + + // Confirm that this new update was at 10 sat/vb. + bobPendingUpdate := bobCloseUpdate.GetClosePending() + require.NotNil(ht, bobCloseUpdate) + require.Equal(ht, bobPendingUpdate.FeePerVbyte, int64(bobFeeRate)) + require.True(ht, bobPendingUpdate.LocalCloseTx) + + var err error + + // Alice should've also received a similar update that Bob has + // increased the closing fee rate to 10 sat/vb with his settled funds. + aliceCloseUpdate, err = ht.ReceiveCloseChannelUpdate(aliceCloseStream) + require.NoError(ht, err) + alicePendingUpdate = aliceCloseUpdate.GetClosePending() + require.NotNil(ht, aliceCloseUpdate) + require.Equal(ht, alicePendingUpdate.FeePerVbyte, int64(bobFeeRate)) + require.False(ht, alicePendingUpdate.LocalCloseTx) + + // We'll now attempt to make a fee update that increases Alice's fee + // rate by 6 sat/vb, which should be rejected as it is too small of an + // increase for the RBF rules. The RPC API however will return the new + // fee. We'll skip the mempool check here as it won't make it in. + aliceRejectedFeeRate := aliceFeeRate + 1 + _, aliceCloseUpdate = ht.CloseChannelAssertPending( + alice, chanPoint, false, + lntest.WithCoopCloseFeeRate(aliceRejectedFeeRate), + lntest.WithLocalTxNotify(), lntest.WithSkipMempoolCheck(), + ) + alicePendingUpdate = aliceCloseUpdate.GetClosePending() + require.NotNil(ht, aliceCloseUpdate) + require.Equal( + ht, alicePendingUpdate.FeePerVbyte, + int64(aliceRejectedFeeRate), + ) + require.True(ht, alicePendingUpdate.LocalCloseTx) + + _, err = ht.ReceiveCloseChannelUpdate(bobCloseStream) + require.NoError(ht, err) + + // We'll now attempt a fee update that we can't actually pay for. This + // will actually show up as an error to the remote party. + aliceRejectedFeeRate = 100_000 + _, _ = ht.CloseChannelAssertPending( + alice, chanPoint, false, + lntest.WithCoopCloseFeeRate(aliceRejectedFeeRate), + lntest.WithLocalTxNotify(), + lntest.WithExpectedErrString("cannot pay for fee"), + ) + + // At this point, we'll have Alice+Bob reconnect so we can ensure that + // we can continue to do RBF bumps even after a reconnection. + ht.DisconnectNodes(alice, bob) + ht.ConnectNodes(alice, bob) + + // Next, we'll have Alice double that fee rate again to 20 sat/vb. + aliceFeeRate = bobFeeRate * 2 + aliceCloseStream, aliceCloseUpdate = ht.CloseChannelAssertPending( + alice, chanPoint, false, + lntest.WithCoopCloseFeeRate(aliceFeeRate), + lntest.WithLocalTxNotify(), + ) + + alicePendingUpdate = aliceCloseUpdate.GetClosePending() + require.NotNil(ht, aliceCloseUpdate) + require.Equal( + ht, alicePendingUpdate.FeePerVbyte, int64(aliceFeeRate), + ) + require.True(ht, alicePendingUpdate.LocalCloseTx) + + // To conclude, we'll mine a block which should now confirm Alice's + // version of the coop close transaction. + block := ht.MineBlocksAndAssertNumTxes(1, 1)[0] + + // Both Alice and Bob should trigger a final close update to signal the + // closing transaction has confirmed. + aliceClosingTxid := ht.WaitForChannelCloseEvent(aliceCloseStream) + ht.AssertTxInBlock(block, aliceClosingTxid) +} diff --git a/itest/lnd_coop_close_with_htlcs_test.go b/itest/lnd_coop_close_with_htlcs_test.go index 0fc75e3a8..02cfc3eac 100644 --- a/itest/lnd_coop_close_with_htlcs_test.go +++ b/itest/lnd_coop_close_with_htlcs_test.go @@ -66,7 +66,6 @@ func testCoopCloseWithHtlcs(ht *lntest.HarnessTest) { // channel party initiates a channel shutdown while an HTLC is still pending on // the channel. func coopCloseWithHTLCs(ht *lntest.HarnessTest, alice, bob *node.HarnessNode) { - ht.ConnectNodes(alice, bob) // Here we set up a channel between Alice and Bob, beginning with a diff --git a/itest/lnd_sweep_test.go b/itest/lnd_sweep_test.go index afc237713..83cde166a 100644 --- a/itest/lnd_sweep_test.go +++ b/itest/lnd_sweep_test.go @@ -1979,6 +1979,7 @@ func testBumpForceCloseFee(ht *lntest.HarnessTest) { closeTxid, err := chainhash.NewHash(pendingClose.Txid) require.NoError(ht, err) closingTx := ht.AssertTxInMempool(*closeTxid) + require.NotNil(ht, closingTx) // The default commitment fee for anchor channels is capped at 2500 // sat/kw but there might be some inaccuracies because of the witness diff --git a/lntest/harness.go b/lntest/harness.go index f7a8eec65..ffbedea9f 100644 --- a/lntest/harness.go +++ b/lntest/harness.go @@ -1211,6 +1211,19 @@ func (h *HarnessTest) OpenChannelAssertErr(srcNode, destNode *node.HarnessNode, // closeChannelOpts holds the options for closing a channel. type closeChannelOpts struct { feeRate fn.Option[chainfee.SatPerVByte] + + // localTxOnly is a boolean indicating if we should only attempt to + // consume close pending notifications for the local transaction. + localTxOnly bool + + // skipMempoolCheck is a boolean indicating if we should skip the normal + // mempool check after a coop close. + skipMempoolCheck bool + + // errString is an expected error. If this is non-blank, then we'll + // assert that the coop close wasn't possible, and returns an error that + // contains this err string. + errString string } // CloseChanOpt is a functional option to modify the way we close a channel. @@ -1224,6 +1237,32 @@ func WithCoopCloseFeeRate(rate chainfee.SatPerVByte) CloseChanOpt { } } +// WithLocalTxNotify is a functional option to indicate that we should only +// notify for the local txn. This is useful for the RBF coop close type, as +// it'll notify for both local and remote txns. +func WithLocalTxNotify() CloseChanOpt { + return func(o *closeChannelOpts) { + o.localTxOnly = true + } +} + +// WithSkipMempoolCheck is a functional option to indicate that we should skip +// the mempool check. This can be used when a coop close iteration may not +// result in a newly broadcast transaction. +func WithSkipMempoolCheck() CloseChanOpt { + return func(o *closeChannelOpts) { + o.skipMempoolCheck = true + } +} + +// WithExpectedErrString is a functional option that can be used to assert that +// an error occurs during the coop close process. +func WithExpectedErrString(errString string) CloseChanOpt { + return func(o *closeChannelOpts) { + o.errString = errString + } +} + // defaultCloseOpts returns the set of default close options. func defaultCloseOpts() *closeChannelOpts { return &closeChannelOpts{} @@ -1267,23 +1306,49 @@ func (h *HarnessTest) CloseChannelAssertPending(hn *node.HarnessNode, _, err = h.ReceiveCloseChannelUpdate(stream) require.NoError(h, err, "close channel update got error: %v", err) - event, err = h.ReceiveCloseChannelUpdate(stream) - if err != nil { - h.Logf("Test: %s, close channel got error: %v", - h.manager.currentTestCase, err) + var closeTxid *chainhash.Hash + for { + event, err = h.ReceiveCloseChannelUpdate(stream) + if err != nil { + h.Logf("Test: %s, close channel got error: %v", + h.manager.currentTestCase, err) + } + if err != nil && closeOpts.errString == "" { + require.NoError(h, err, "retry closing channel failed") + } else if err != nil && closeOpts.errString != "" { + require.ErrorContains(h, err, closeOpts.errString) + return nil, nil + } + + pendingClose, ok := event.Update.(*lnrpc.CloseStatusUpdate_ClosePending) //nolint:ll + require.Truef(h, ok, "expected channel close "+ + "update, instead got %v", pendingClose) + + if !pendingClose.ClosePending.LocalCloseTx && + closeOpts.localTxOnly { + + continue + } + + notifyRate := pendingClose.ClosePending.FeePerVbyte + if closeOpts.localTxOnly && + notifyRate != int64(closeReq.SatPerVbyte) { + continue + } + + closeTxid, err = chainhash.NewHash( + pendingClose.ClosePending.Txid, + ) + require.NoErrorf(h, err, "unable to decode closeTxid: %v", + pendingClose.ClosePending.Txid) + + break } - require.NoError(h, err, "retry closing channel failed") - pendingClose, ok := event.Update.(*lnrpc.CloseStatusUpdate_ClosePending) - require.Truef(h, ok, "expected channel close update, instead got %v", - pendingClose) - - closeTxid, err := chainhash.NewHash(pendingClose.ClosePending.Txid) - require.NoErrorf(h, err, "unable to decode closeTxid: %v", - pendingClose.ClosePending.Txid) - - // Assert the closing tx is in the mempool. - h.miner.AssertTxInMempool(*closeTxid) + if !closeOpts.skipMempoolCheck { + // Assert the closing tx is in the mempool. + h.miner.AssertTxInMempool(*closeTxid) + } return stream, event } From fccd984ac18691870675b9174c7c9eb554c15ee9 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Mon, 10 Feb 2025 19:05:52 -0800 Subject: [PATCH 43/48] multi: extract new DeriveHeightHint() function, use for new rbf closer With this commit, we make sure we set the right height hint, even if the channel is a zero conf channel. --- peer/brontide.go | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/peer/brontide.go b/peer/brontide.go index 24147663c..29fe0576f 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -3857,7 +3857,7 @@ func (p *Brontide) initRbfChanCloser( spendEvent := protofsm.RegisterSpend[chancloser.ProtocolEvent]{ OutPoint: channel.ChannelPoint(), PkScript: channel.FundingTxOut().PkScript, - HeightHint: scid.BlockHeight, + HeightHint: channel.DeriveHeightHint(), PostSpendEvent: fn.Some[chancloser.RbfSpendMapper]( chancloser.SpendMapper, ), From 8d9ed0ca733108d0943e76fabca6a2ee3f3d5049 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 11 Feb 2025 17:33:34 -0800 Subject: [PATCH 44/48] docs/release-notes: add rbf coop close section --- docs/release-notes/release-notes-0.19.0.md | 23 ++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/docs/release-notes/release-notes-0.19.0.md b/docs/release-notes/release-notes-0.19.0.md index 9fc357723..7663a5226 100644 --- a/docs/release-notes/release-notes-0.19.0.md +++ b/docs/release-notes/release-notes-0.19.0.md @@ -90,6 +90,23 @@ # New Features +* Add support for [archiving channel backup](https://github.com/lightningnetwork/lnd/pull/9232) + in a designated folder which allows for easy referencing in the future. A new + config is added `disable-backup-archive`, with default set to false, to + determine if previous channel backups should be archived or not. + +## Protocol Updates + +* `lnd` now [supports the new RBF cooperative close +flow](https://github.com/lightningnetwork/lnd/pull/8453). Unlike the old flow, +this version now uses RBF to enable either side to increase their fee rate using +their _own_ channel funds. This removes the old "negotiation" logic that could +fail, with a version where either side can increase the fee on their coop close +transaction using their channel balance. + +This new feature can be activated with a new config flag: +`--protocol.rbf-coop-close`. + * [Support](https://github.com/lightningnetwork/lnd/pull/8390) for [experimental endorsement](https://github.com/lightning/blips/pull/27) signal relay was added. This signal has *no impact* on routing, and @@ -103,10 +120,7 @@ initial historical sync may be blocked due to a race condition in handling the syncer's internal state. -* Add support for [archiving channel backup](https://github.com/lightningnetwork/lnd/pull/9232) - in a designated folder which allows for easy referencing in the future. A new - config is added `disable-backup-archive`, with default set to false, to - determine if previous channel backups should be archived or not. + * [The max fee rate](https://github.com/lightningnetwork/lnd/pull/9491) is now respected when a coop close is initiated. Before the max fee rate would only @@ -428,6 +442,7 @@ The underlying functionality between those two options remain the same. * Keagan McClelland * Nishant Bansal * Oliver Gugger +* Olaoluwa Osuntokun * Pins * Viktor Tigerström * Yong Yu From 720d98cc1521e1a02349dc7b5262b833b01dfb19 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 4 Mar 2025 18:18:02 -0800 Subject: [PATCH 45/48] msgmux: fix arg expectation for mock in unit test --- log.go | 2 ++ msgmux/msg_router.go | 2 +- msgmux/msg_router_test.go | 2 +- 3 files changed, 4 insertions(+), 2 deletions(-) diff --git a/log.go b/log.go index e4c1d2ebe..5d1f2567f 100644 --- a/log.go +++ b/log.go @@ -44,6 +44,7 @@ import ( "github.com/lightningnetwork/lnd/lnwallet/chanfunding" "github.com/lightningnetwork/lnd/lnwallet/rpcwallet" "github.com/lightningnetwork/lnd/monitoring" + "github.com/lightningnetwork/lnd/msgmux" "github.com/lightningnetwork/lnd/netann" "github.com/lightningnetwork/lnd/peer" "github.com/lightningnetwork/lnd/peernotifier" @@ -202,6 +203,7 @@ func SetupLoggers(root *build.SubLoggerManager, interceptor signal.Interceptor) ) AddV1SubLogger(root, graphdb.Subsystem, interceptor, graphdb.UseLogger) AddSubLogger(root, chainio.Subsystem, interceptor, chainio.UseLogger) + AddSubLogger(root, msgmux.Subsystem, interceptor, msgmux.UseLogger) } // AddSubLogger is a helper method to conveniently create and register the diff --git a/msgmux/msg_router.go b/msgmux/msg_router.go index 9aac3bc64..823fed668 100644 --- a/msgmux/msg_router.go +++ b/msgmux/msg_router.go @@ -244,7 +244,7 @@ func (p *MultiMsgRouter) msgRouter(ctx context.Context) { var err error if !couldSend { log.Tracef("MsgRouter: unable to route "+ - "msg %T", msg) + "msg %T", msg.Message) err = ErrUnableToRouteMsg } diff --git a/msgmux/msg_router_test.go b/msgmux/msg_router_test.go index d6262a7ab..8ecad778e 100644 --- a/msgmux/msg_router_test.go +++ b/msgmux/msg_router_test.go @@ -26,7 +26,7 @@ func (m *mockEndpoint) CanHandle(msg PeerMsg) bool { } func (m *mockEndpoint) SendMessage(ctx context.Context, msg PeerMsg) bool { - args := m.Called(msg) + args := m.Called(ctx, msg) return args.Bool(0) } From 8df58a984c5101b5ea7bfe120a2c31597d681a6e Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Wed, 12 Mar 2025 16:06:31 -0500 Subject: [PATCH 46/48] lnwallet/chancloser: add docs for new rbf chan closer --- lnwallet/chancloser/rbf_close.md | 219 +++++++++++++++++++++++++ lnwallet/chancloser/rbf_coop_states.go | 2 +- 2 files changed, 220 insertions(+), 1 deletion(-) create mode 100644 lnwallet/chancloser/rbf_close.md diff --git a/lnwallet/chancloser/rbf_close.md b/lnwallet/chancloser/rbf_close.md new file mode 100644 index 000000000..ac532c5d5 --- /dev/null +++ b/lnwallet/chancloser/rbf_close.md @@ -0,0 +1,219 @@ +# RBF Co-op Close State Machine + +## Abstract + +The Lightning Network Daemon (lnd) implements a cooperative channel closing +mechanism that allows two connected peers to negotiate a mutually agreed-upon +closing transaction. This document outlines the state machine that governs the +cooperative closing process, defining the various states a channel progresses +through from active operation to final closure. + +Cooperative closing is distinct from force closing in that it requires both +channel participants to agree on the final channel state and closing +transaction, resulting in lower fees and immediate fund availability compared to +unilateral channel closures. + +## State Machine Overview + +The cooperative closing state machine manages the lifecycle of a channel from +the moment a closing request is initiated until the closing transaction is +confirmed on the blockchain. The state transitions ensure proper negotiation of +closing fees, validation of signatures, and handling of protocol violations. + +### High-Level Flow + +1. An active channel receives a shutdown request (locally or remotely) +2. Channel stops accepting new HTLCs and begins flushing existing ones +3. Once flushed, nodes begin negotiating closing transaction fee +4. Upon agreement, nodes sign and broadcast the transaction +5. **RBF Iteration (optional)**: While waiting for confirmation, either node can + propose a fee increase via Replace-By-Fee (RBF), restarting the negotiation + process with higher fees +6. Process completes when transaction confirms on-chain + +## States and Transitions +```mermaid +--- +title: Co-Op Close V2 +--- +stateDiagram-v2 + state CoopCloseV2 { + [*] --> ChannelActive + ChannelActive --> ShutdownPending: send_shutdown + ChannelActive --> ShutdownPending: shutdown_received + ShutdownPending --> ChannelFlushing: shutdown_received + ShutdownPending --> ChannelFlushing: shutdown_complete + + ChannelFlushing --> ClosingNegotiation: channel_flushed + + state ClosingNegotiation { + + state LocalSide { + [*] --> LocalCloseStart + LocalCloseStart --> LocalOfferSent: send_offer + LocalOfferSent --> ClosePending: local_sig_received + } + + state RemoteSide { + [*] --> RemoteCloseStart + RemoteCloseStart --> ClosePending: offer_received + } + + CloseErr --> LocalCloseStart: send_offer_rbf + CloseErr --> RemoteCloseStart: offer_received_rbf + LocalCloseStart --> CloseErr: protocol_violation + RemoteCloseStart --> CloseErr: protocol_violation + + ClosePending --> LocalCloseStart: send_offer_rbf + ClosePending --> RemoteCloseStart: offer_received_rbf + } + + ClosingNegotiation --> CloseFin: txn_confirmation + } +``` + +### ChannelActive + +The initial state where the channel is fully operational. + +- **Transitions**: + - `send_shutdown` → `ShutdownPending` (Local node initiates closing process) + - `shutdown_received` → `ShutdownPending` (Remote node initiates closing process) + +### ShutdownPending + +The channel has entered the closing process but is still processing existing HTLCs. + +- **Transitions**: + - `shutdown_received` → `ChannelFlushing` (When both parties have exchanged + shutdown messages) + + - `shutdown_complete` → `ChannelFlushing` (When local shutdown processing is + complete) + +### ChannelFlushing + +The channel no longer accepts new HTLCs and is waiting for existing HTLCs to +resolve. + +- **Transitions**: + - `channel_flushed` → `ClosingNegotiation` (When all HTLCs are settled) + +### ClosingNegotiation +This composite state encompasses multiple substates related to the negotiation + +of the closing transaction fee. It's divided into local and remote operation +flows. + +#### LocalSide + +- **LocalCloseStart**: Ready to initiate or respond to closing negotiation from +local perspective. + - **Transitions**: + - `send_offer` → `LocalOfferSent` (Local node proposes a closing fee) + - `protocol_violation` → `CloseErr` (Invalid message or state detected) + +- **LocalOfferSent**: Local node has sent a closing offer and is awaiting +confirmation. + - **Transitions**: + - `local_sig_received` → `ClosePending` (Local signature validated and + accepted) + +#### RemoteSide + +- **RemoteCloseStart**: Ready to process closing negotiation initiated by remote + node. + - **Transitions**: + - `offer_received` → `ClosePending` (Remote node proposal received and + accepted) + - `protocol_violation` → `CloseErr` (Invalid message or state detected) + +#### Shared States + +- **ClosePending**: Closing transaction has been negotiated, signed by both + parties, and broadcast to the network. Waiting for on-chain confirmation. + + - **Transitions**: + - `send_offer_rbf` → `LocalCloseStart` (Local node initiates fee increase + via RBF) + + - `offer_received_rbf` → `RemoteCloseStart` (Remote node initiates fee + increase via RBF) + +- **CloseErr**: Error state for handling protocol violations. + - **Transitions**: + - `send_offer_rbf` → `LocalCloseStart` (Local node attempts recovery with + new offer) + + - `offer_received_rbf` → `RemoteCloseStart` (Remote node attempts recovery + with new offer) + +### CloseFin + +The closing transaction has been confirmed on the blockchain, and the channel is +considered closed. + +- **Transitions**: None (terminal state) + +## Fee Negotiation Process + +Fee negotiation is a critical component of the cooperative close process. The +protocol supports Replace-By-Fee (RBF) to handle changing network fee +conditions: + +1. Initial fee proposal is based on current network fee estimation +2. Either party can propose higher fees using RBF if confirmation is taking too + long +3. Nodes can alternate proposals until reaching agreement +4. Each proposal must satisfy RBF requirements (incremental fee increase) + +## Protocol Violation Handling + +The `CloseErr` state provides recovery paths when protocol violations occur: + +- Invalid signature formats +- Out-of-sequence messages +- Timeout violations +- Malformed closing transactions + +Recovery typically involves restarting the negotiation with a new closing offer. + +## Example Scenarios + +### Standard Cooperative Close + +1. Local node initiates closing: `ChannelActive` → `ShutdownPending` (via + `send_shutdown`) + +2. Remote acknowledges: `ShutdownPending` → `ChannelFlushing` (via + `shutdown_received`) + +3. HTLCs resolve: `ChannelFlushing` → `ClosingNegotiation` (via + `channel_flushed`) + +4. Local proposes fee: `LocalCloseStart` → `LocalOfferSent` (via `send_offer`) + +5. Local signature validated: `LocalOfferSent` → `ClosePending` (via + `local_sig_received`) + +6. Transaction confirms: `ClosePending` → `CloseFin` (via `txn_confirmation`) + +### Fee Bump Due to Network Congestion + +1. ... (steps 1-5 same as above) +2. While in `ClosePending`, network fees increase + +3. Local node initiates RBF: `ClosePending` → `LocalCloseStart` (via + `send_offer_rbf`) + +4. New proposal cycle begins with higher fees + +5. When agreement is reached on new fees: `ClosePending` → `CloseFin` (via + `txn_confirmation`) + +## Implementation Notes + +- This state machine is implemented in the `peer.go` and `channel.go` files +within the lnd codebase +- State transitions are logged at the debug level +- The `ChanCloser` interface manages the state machine execution diff --git a/lnwallet/chancloser/rbf_coop_states.go b/lnwallet/chancloser/rbf_coop_states.go index 86de10c9f..5b549a249 100644 --- a/lnwallet/chancloser/rbf_coop_states.go +++ b/lnwallet/chancloser/rbf_coop_states.go @@ -898,7 +898,7 @@ type CloseErr struct { // String returns the name of the state for CloseErr, including error and party // details. func (c *CloseErr) String() string { - return fmt.Sprintf("CloseErr(Party: %v, Error: %v)", c.Party, c.Err()) + return fmt.Sprintf("CloseErr(party=%v, err=%v)", c.Party, c.ErrState) } // ShouldRouteTo returns true if the target state should process the target From 3681ba6d8ba625d7201634c2d0f1005815bf63da Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Mon, 17 Mar 2025 16:18:19 -0500 Subject: [PATCH 47/48] peer: for RBF state machine block req if RBF iterating is outstanding This fixes an issue in the itests in the restart case. We'd see an error like: ``` 2025-03-12 23:41:10.754 [ERR] PFSM state_machine.go:661: FSM(rbf_chan_closer(2f20725d9004f7fda7ef280f77dd8d419fd6669bda1a5231dd58d6f6597066e0:0)): Unable to apply event err="invalid state transition: received *chancloser.SendOfferEvent while in ClosingNegotiation(local=LocalOfferSent(proposed_fee=0.00000193 BTC), remote=ClosePending(txid=07229915459cb439bdb8ad4f5bf112dc6f42fca0192ea16a7d6dd05e607b92ae, party=Remote, fee_rate=1 sat/vb))" ``` We resolve this by waiting to send in the new request unil the old one has been completed. --- lntest/harness.go | 1 + peer/brontide.go | 62 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 63 insertions(+) diff --git a/lntest/harness.go b/lntest/harness.go index ffbedea9f..c43cdfd45 100644 --- a/lntest/harness.go +++ b/lntest/harness.go @@ -1333,6 +1333,7 @@ func (h *HarnessTest) CloseChannelAssertPending(hn *node.HarnessNode, notifyRate := pendingClose.ClosePending.FeePerVbyte if closeOpts.localTxOnly && notifyRate != int64(closeReq.SatPerVbyte) { + continue } diff --git a/peer/brontide.go b/peer/brontide.go index 29fe0576f..a7081c685 100644 --- a/peer/brontide.go +++ b/peer/brontide.go @@ -3981,6 +3981,57 @@ func newRPCShutdownInit(req *htlcswitch.ChanClose) shutdownInit { ) } +// waitUntilRbfCoastClear waits until the RBF co-op close state machine has +// advanced to a terminal state before attempting another fee bump. +func waitUntilRbfCoastClear(ctx context.Context, + rbfCloser *chancloser.RbfChanCloser) error { + + coopCloseStates := rbfCloser.RegisterStateEvents() + newStateChan := coopCloseStates.NewItemCreated.ChanOut() + defer rbfCloser.RemoveStateSub(coopCloseStates) + + isTerminalState := func(newState chancloser.RbfState) bool { + // If we're not in the negotiation sub-state, then we aren't at + // the terminal state yet. + state, ok := newState.(*chancloser.ClosingNegotiation) + if !ok { + return false + } + + localState := state.PeerState.GetForParty(lntypes.Local) + + // If this isn't the close pending state, we aren't at the + // terminal state yet. + _, ok = localState.(*chancloser.ClosePending) + + return ok + } + + // Before we enter the subscription loop below, check to see if we're + // already in the terminal state. + rbfState, err := rbfCloser.CurrentState() + if err != nil { + return err + } + if isTerminalState(rbfState) { + return nil + } + + peerLog.Debugf("Waiting for RBF iteration to complete...") + + for { + select { + case newState := <-newStateChan: + if isTerminalState(newState) { + return nil + } + + case <-ctx.Done(): + return fmt.Errorf("context canceled") + } + } +} + // startRbfChanCloser kicks off the co-op close process using the new RBF based // co-op close protocol. This is called when we're the one that's initiating // the cooperative channel close. @@ -4070,6 +4121,17 @@ func (p *Brontide) startRbfChanCloser(shutdown shutdownInit, // the prior fee rate), or we've sent an offer, then we'll // trigger a new offer event. case *chancloser.ClosingNegotiation: + // Before we send the event below, we'll wait until + // we're in a semi-terminal state. + err := waitUntilRbfCoastClear(ctx, rbfCloser) + if err != nil { + peerLog.Warnf("ChannelPoint(%v): unable to "+ + "wait for coast to clear: %v", + chanPoint, err) + + return + } + event := chancloser.ProtocolEvent( &chancloser.SendOfferEvent{ TargetFeeRate: feeRate, From 42fa83700a8b1199d5a83933d2521afdc05acb57 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Tue, 18 Mar 2025 12:48:01 -0500 Subject: [PATCH 48/48] docs/release-notes: update release notes for RBF close --- docs/release-notes/release-notes-0.19.0.md | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/docs/release-notes/release-notes-0.19.0.md b/docs/release-notes/release-notes-0.19.0.md index 7663a5226..38b5f5990 100644 --- a/docs/release-notes/release-notes-0.19.0.md +++ b/docs/release-notes/release-notes-0.19.0.md @@ -98,7 +98,7 @@ ## Protocol Updates * `lnd` now [supports the new RBF cooperative close -flow](https://github.com/lightningnetwork/lnd/pull/8453). Unlike the old flow, +flow](https://github.com/lightningnetwork/lnd/pull/9610). Unlike the old flow, this version now uses RBF to enable either side to increase their fee rate using their _own_ channel funds. This removes the old "negotiation" logic that could fail, with a version where either side can increase the fee on their coop close @@ -107,6 +107,10 @@ transaction using their channel balance. This new feature can be activated with a new config flag: `--protocol.rbf-coop-close`. +With this new co-op close type, users can issue multiple `lncli closechannnel` +commands with increasing fee rates to use RBF to bump an existing signed co-op +close transaction. + * [Support](https://github.com/lightningnetwork/lnd/pull/8390) for [experimental endorsement](https://github.com/lightning/blips/pull/27) signal relay was added. This signal has *no impact* on routing, and