mirror of
https://github.com/lightningnetwork/lnd.git
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ab41f28a8f
With this commit, we update all the resolvers to pass in the new htlc resolution blobs. Along the way, we remove the old blocking guard on this resolution logic for HTLCs with blobs.
91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
package contractcourt
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import (
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"math"
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"github.com/btcsuite/btcd/wire"
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"github.com/lightningnetwork/lnd/chainntnfs"
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"github.com/lightningnetwork/lnd/channeldb"
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"github.com/lightningnetwork/lnd/fn"
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"github.com/lightningnetwork/lnd/input"
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"github.com/lightningnetwork/lnd/tlv"
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)
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// htlcLeaseResolver is a struct that houses the lease specific HTLC resolution
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// logic. This includes deriving the _true_ waiting height, as well as the
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// input to offer to the sweeper.
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type htlcLeaseResolver struct {
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// channelInitiator denotes whether the party responsible for resolving
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// the contract initiated the channel.
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channelInitiator bool
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// leaseExpiry denotes the additional waiting period the contract must
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// hold until it can be resolved. This waiting period is known as the
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// expiration of a script-enforced leased channel and only applies to
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// the channel initiator.
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//
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// NOTE: This value should only be set when the contract belongs to a
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// leased channel.
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leaseExpiry uint32
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}
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// hasCLTV denotes whether the resolver must wait for an additional CLTV to
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// expire before resolving the contract.
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func (h *htlcLeaseResolver) hasCLTV() bool {
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return h.channelInitiator && h.leaseExpiry > 0
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}
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// deriveWaitHeight computes the height the resolver needs to wait until it can
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// sweep the input.
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func (h *htlcLeaseResolver) deriveWaitHeight(csvDelay uint32,
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commitSpend *chainntnfs.SpendDetail) uint32 {
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waitHeight := uint32(commitSpend.SpendingHeight) + csvDelay - 1
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if h.hasCLTV() {
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waitHeight = uint32(math.Max(
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float64(waitHeight), float64(h.leaseExpiry),
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))
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}
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return waitHeight
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}
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// makeSweepInput constructs the type of input (either just csv or csv+ctlv) to
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// send to the sweeper so the output can ultimately be swept.
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func (h *htlcLeaseResolver) makeSweepInput(op *wire.OutPoint,
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wType, cltvWtype input.StandardWitnessType,
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signDesc *input.SignDescriptor, csvDelay, broadcastHeight uint32,
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payHash [32]byte, resBlob fn.Option[tlv.Blob]) *input.BaseInput {
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if h.hasCLTV() {
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log.Infof("%T(%x): CSV and CLTV locks expired, offering "+
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"second-layer output to sweeper: %v", h, payHash, op)
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return input.NewCsvInputWithCltv(
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op, cltvWtype, signDesc,
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broadcastHeight, csvDelay,
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h.leaseExpiry,
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input.WithResolutionBlob(resBlob),
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)
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}
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log.Infof("%T(%x): CSV lock expired, offering second-layer output to "+
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"sweeper: %v", h, payHash, op)
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return input.NewCsvInput(
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op, wType, signDesc, broadcastHeight, csvDelay,
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input.WithResolutionBlob(resBlob),
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)
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}
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// SupplementState allows the user of a ContractResolver to supplement it with
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// state required for the proper resolution of a contract.
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//
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// NOTE: Part of the ContractResolver interface.
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func (h *htlcLeaseResolver) SupplementState(state *channeldb.OpenChannel) {
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if state.ChanType.HasLeaseExpiration() {
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h.leaseExpiry = state.ThawHeight
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}
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h.channelInitiator = state.IsInitiator
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}
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