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htlcswitch+lnwallet: calculate fee exposure as commit fees + dust

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This commit expands the definition of the dust limit to take into
account commitment fees as well as dust HTLCs. The dust limit is now
known as a fee exposure threshold. Dust HTLCs are fees anyways so it
makes sense to account for commitment fees as well. The link has
been modified slightly to calculate dust. In the future, the switch
dust calculations can be removed.
This commit is contained in:
Eugene Siegel
2024-06-03 12:43:33 -04:00
parent b7c59b36a7
commit d6001d033b
11 changed files with 456 additions and 88 deletions
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12
htlcswitch/interfaces.go
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@@ -3,9 +3,11 @@ package htlcswitch
import (
"context"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/channeldb/models"
"github.com/lightningnetwork/lnd/fn"
"github.com/lightningnetwork/lnd/invoices"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwallet/chainfee"
@@ -59,8 +61,10 @@ type packetHandler interface {
// whether a link has too much dust exposure.
type dustHandler interface {
// getDustSum returns the dust sum on either the local or remote
// commitment.
getDustSum(remote bool) lnwire.MilliSatoshi
// commitment. An optional fee parameter can be passed in which is used
// to calculate the dust sum.
getDustSum(remote bool,
fee fn.Option[chainfee.SatPerKWeight]) lnwire.MilliSatoshi
// getFeeRate returns the current channel feerate.
getFeeRate() chainfee.SatPerKWeight
@@ -68,6 +72,10 @@ type dustHandler interface {
// getDustClosure returns a closure that can evaluate whether a passed
// HTLC is dust.
getDustClosure() dustClosure
// getCommitFee returns the commitment fee in satoshis from either the
// local or remote commitment. This does not include dust.
getCommitFee(remote bool) btcutil.Amount
}
// scidAliasHandler is an interface that the ChannelLink implements so it can