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funding+peer: add support for new musig2 channel funding flow

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In this commit, we add support for the new musig2 channel funding flow.
This flow is identical to the existing flow, but not both sides need to
exchange local nonces up front, and then signatures sent are now partial
signatures instead of regular signatures.

The funding manager also gains some new state of the local nonces it
needs to generate in order to send the funding locked message, and also
process the funding locked message from the remote party.

In order to allow the funding manger to generate the nonces that need to
be applied to each channel, then AddNewChannel method has been modified
to accept a set of options that the peer will then use to bind the
nonces to a new channel.
This commit is contained in:
Olaoluwa Osuntokun
2023-01-19 20:26:05 -08:00
parent a8416300dd
commit 15978a8691
9 changed files with 347 additions and 60 deletions
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3
lnpeer/mock_peer.go
View File

@@ -5,7 +5,6 @@ import (
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/stretchr/testify/mock"
)
@@ -28,7 +27,7 @@ func (m *MockPeer) SendMessageLazy(sync bool, msgs ...lnwire.Message) error {
return args.Error(0)
}
func (m *MockPeer) AddNewChannel(channel *channeldb.OpenChannel,
func (m *MockPeer) AddNewChannel(channel *NewChannel,
cancel <-chan struct{}) error {
args := m.Called(channel, cancel)

13
lnpeer/peer.go
View File

@@ -6,9 +6,20 @@ import (
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/lnwire"
)
// NewChannel is a newly funded channel. This struct couples a channel along
// with the set of channel options that may change how the channel is created.
// This can be used to pass along the nonce state needed for taproot channels.
type NewChannel struct {
*channeldb.OpenChannel
// ChanOpts can be used to change how the channel is created.
ChanOpts []lnwallet.ChannelOpt
}
// Peer is an interface which represents a remote lightning node.
type Peer interface {
// SendMessage sends a variadic number of high-priority message to
@@ -25,7 +36,7 @@ type Peer interface {
// AddNewChannel adds a new channel to the peer. The channel should fail
// to be added if the cancel channel is closed.
AddNewChannel(channel *channeldb.OpenChannel, cancel <-chan struct{}) error
AddNewChannel(newChan *NewChannel, cancel <-chan struct{}) error
// AddPendingChannel adds a pending open channel ID to the peer. The
// channel should fail to be added if the cancel chan is closed.