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htlcswitch: ability to start link in shutdown mode

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In this commit, we add the ability to start a link in shutdown mode.
This means that we immediately disable any new HTLC adds in the outgoing
direction and that we queue up a Shutdown message after the next
CommitSig message is sent (or immediately if no CommitSig message is
owed).
This commit is contained in:
Elle Mouton 2024-02-06 16:14:36 +02:00
parent dc25b425c0
commit 5de7792520
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GPG key ID: D7D916376026F177
1 changed files with 28 additions and 0 deletions
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28
htlcswitch/link.go
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@ -19,6 +19,7 @@ import (
"github.com/lightningnetwork/lnd/channeldb" "github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/channeldb/models" "github.com/lightningnetwork/lnd/channeldb/models"
"github.com/lightningnetwork/lnd/contractcourt" "github.com/lightningnetwork/lnd/contractcourt"
"github.com/lightningnetwork/lnd/fn"
"github.com/lightningnetwork/lnd/htlcswitch/hodl" "github.com/lightningnetwork/lnd/htlcswitch/hodl"
"github.com/lightningnetwork/lnd/htlcswitch/hop" "github.com/lightningnetwork/lnd/htlcswitch/hop"
"github.com/lightningnetwork/lnd/invoices" "github.com/lightningnetwork/lnd/invoices"
@ -271,6 +272,14 @@ type ChannelLinkConfig struct {
// GetAliases is used by the link and switch to fetch the set of // GetAliases is used by the link and switch to fetch the set of
// aliases for a given link. // aliases for a given link.
GetAliases func(base lnwire.ShortChannelID) []lnwire.ShortChannelID GetAliases func(base lnwire.ShortChannelID) []lnwire.ShortChannelID
// PreviouslySentShutdown is an optional value that is set if, at the
// time of the link being started, persisted shutdown info was found for
// the channel. This value being set means that we previously sent a
// Shutdown message to our peer, and so we should do so again on
// re-establish and should not allow anymore HTLC adds on the outgoing
// direction of the link.
PreviouslySentShutdown fn.Option[lnwire.Shutdown]
} }
// channelLink is the service which drives a channel's commitment update // channelLink is the service which drives a channel's commitment update
@ -1190,6 +1199,25 @@ func (l *channelLink) htlcManager() {
} }
} }
// If a shutdown message has previously been sent on this link, then we
// need to make sure that we have disabled any HTLC adds on the outgoing
// direction of the link and that we re-resend the same shutdown message
// that we previously sent.
l.cfg.PreviouslySentShutdown.WhenSome(func(shutdown lnwire.Shutdown) {
// Immediately disallow any new outgoing HTLCs.
if !l.DisableAdds(Outgoing) {
l.log.Warnf("Outgoing link adds already disabled")
}
// Re-send the shutdown message the peer. Since syncChanStates
// would have sent any outstanding CommitSig, it is fine for us
// to immediately queue the shutdown message now.
err := l.cfg.Peer.SendMessage(false, &shutdown)
if err != nil {
l.log.Warnf("Error sending shutdown message: %v", err)
}
})
// We've successfully reestablished the channel, mark it as such to // We've successfully reestablished the channel, mark it as such to
// allow the switch to forward HTLCs in the outbound direction. // allow the switch to forward HTLCs in the outbound direction.
l.markReestablished() l.markReestablished()