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Merged
t-bast merged 3 commits into from
Aug 19, 2022
Merged

Unlock utxos during dual funding failures #2390

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93aeaa8
Unlock utxos during dual funding failures
t-bast Aug 19, 2022
5eda6bd
fixup! Unlock utxos during dual funding failures
t-bast Aug 19, 2022
764ec6d
Clarify comment
t-bast Aug 19, 2022
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21 changes: 13 additions & 8 deletions eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelData.scala
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Expand Up @@ -400,6 +400,16 @@ object RealScidStatus {
*/
case class ShortIds(real: RealScidStatus, localAlias: Alias, remoteAlias_opt: Option[Alias])

sealed trait UnconfirmedFundingTx {
def signedTx_opt: Option[Transaction]
}
case class SingleFundedUnconfirmedFundingTx(signedTx: Transaction) extends UnconfirmedFundingTx {
override val signedTx_opt: Option[Transaction] = Some(signedTx)
}
case class DualFundedUnconfirmedFundingTx(sharedTx: SignedSharedTransaction) extends UnconfirmedFundingTx {
override def signedTx_opt: Option[Transaction] = sharedTx.signedTx_opt
}

/** Once a dual funding tx has been signed, we must remember the associated commitments. */
case class DualFundingTx(fundingTx: SignedSharedTransaction, commitments: Commitments)

Expand Down Expand Up @@ -486,12 +496,7 @@ final case class DATA_WAIT_FOR_DUAL_FUNDING_CONFIRMED(commitments: Commitments,
waitingSince: BlockHeight, // how long have we been waiting for a funding tx to confirm
lastChecked: BlockHeight, // last time we checked if the channel was double-spent
rbfAttempt: Option[typed.ActorRef[InteractiveTxBuilder.Command]],
deferred: Option[ChannelReady]) extends PersistentChannelData {
val signedFundingTx_opt: Option[Transaction] = fundingTx match {
case _: PartiallySignedSharedTransaction => None
case tx: FullySignedSharedTransaction => Some(tx.signedTx)
}
}
deferred: Option[ChannelReady]) extends PersistentChannelData
final case class DATA_WAIT_FOR_DUAL_FUNDING_READY(commitments: Commitments,
shortIds: ShortIds,
lastSent: ChannelReady) extends PersistentChannelData
Expand All @@ -512,9 +517,9 @@ final case class DATA_NEGOTIATING(commitments: Commitments,
require(!commitments.localParams.isInitiator || closingTxProposed.forall(_.nonEmpty), "initiator must have at least one closing signature for every negotiation attempt because it initiates the closing")
}
final case class DATA_CLOSING(commitments: Commitments,
fundingTx: Option[Transaction], // this will be non-empty if we are the initiator and we got in closing while waiting for our own tx to be published
fundingTx: Option[UnconfirmedFundingTx],
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@t-bast t-bast Aug 19, 2022 •
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The new trait is a bit verbose, but it highlights the fact that this is only used when the funding tx is unconfirmed (which wasn't obvious before). Alternatively, we could just use an Option[Either[Transaction, SignedSharedTransaction]], let me know what you prefer.

What is still a bit confusing is that in the single-funded case, this can be None for two very different reasons:

  1. The funding tx is confirmed
  2. The funding tx is unconfirmed but we're fundee so we don't have it

The dual-funded case doesn't have this ambiguity. I don't know if it's worth fixing for the single-funded case, it would mean wrapping another Option in the SingleFundedUnconfirmedFundingTx case class.

waitingSince: BlockHeight, // how long since we initiated the closing
alternativeCommitments: List[Commitments], // commitments we signed that spend a different funding output
alternativeCommitments: List[DualFundingTx], // commitments we signed that spend a different funding output
mutualCloseProposed: List[ClosingTx], // all exchanged closing sigs are flattened, we use this only to keep track of what publishable tx they have
mutualClosePublished: List[ClosingTx] = Nil,
localCommitPublished: Option[LocalCommitPublished] = None,
Expand Down
6 changes: 5 additions & 1 deletion eclair-core/src/main/scala/fr/acinq/eclair/channel/InteractiveTxBuilder.scala
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Expand Up @@ -167,8 +167,11 @@ object InteractiveTxBuilder {
sealed trait SignedSharedTransaction {
def tx: SharedTransaction
def localSigs: TxSignatures
def signedTx_opt: Option[Transaction]
}
case class PartiallySignedSharedTransaction(tx: SharedTransaction, localSigs: TxSignatures) extends SignedSharedTransaction {
override val signedTx_opt: Option[Transaction] = None
}
case class PartiallySignedSharedTransaction(tx: SharedTransaction, localSigs: TxSignatures) extends SignedSharedTransaction
case class FullySignedSharedTransaction(tx: SharedTransaction, localSigs: TxSignatures, remoteSigs: TxSignatures) extends SignedSharedTransaction {
val signedTx: Transaction = {
import tx._
Expand All @@ -182,6 +185,7 @@ object InteractiveTxBuilder {
val outputs = (localTxOut ++ remoteTxOut).sortBy(_._1).map(_._2)
Transaction(2, inputs, outputs, lockTime)
}
override val signedTx_opt: Option[Transaction] = Some(signedTx)
val feerate: FeeratePerKw = Transactions.fee2rate(tx.fees, signedTx.weight())
}
// @formatter:on
Expand Down
14 changes: 9 additions & 5 deletions eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/Channel.scala
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Expand Up @@ -264,7 +264,7 @@ class Channel(val nodeParams: NodeParams, val wallet: OnChainChannelFunder, val
// There are unconfirmed, alternative funding transactions, so we wait for one to confirm before
// watching transactions spending it.
blockchain ! WatchFundingConfirmed(self, data.commitments.commitInput.outPoint.txid, nodeParams.channelConf.minDepthBlocks)
closing.alternativeCommitments.foreach(c => blockchain ! WatchFundingConfirmed(self, c.commitInput.outPoint.txid, nodeParams.channelConf.minDepthBlocks))
closing.alternativeCommitments.foreach(c => blockchain ! WatchFundingConfirmed(self, c.commitments.commitInput.outPoint.txid, nodeParams.channelConf.minDepthBlocks))
}
closing.mutualClosePublished.foreach(mcp => doPublish(mcp, isInitiator))
closing.localCommitPublished.foreach(lcp => doPublish(lcp, closing.commitments))
Expand All @@ -276,7 +276,7 @@ class Channel(val nodeParams: NodeParams, val wallet: OnChainChannelFunder, val
// if commitment number is zero, we also need to make sure that the funding tx has been published
if (closing.commitments.localCommit.index == 0 && closing.commitments.remoteCommit.index == 0) {
if (closing.commitments.channelFeatures.hasFeature(Features.DualFunding)) {
closing.fundingTx.foreach(tx => wallet.publishTransaction(tx))
closing.fundingTx.flatMap(_.signedTx_opt).foreach(tx => wallet.publishTransaction(tx))
} else {
blockchain ! GetTxWithMeta(self, closing.commitments.commitInput.outPoint.txid)
}
Expand Down Expand Up @@ -1086,15 +1086,15 @@ class Channel(val nodeParams: NodeParams, val wallet: OnChainChannelFunder, val
// NB: waitingSinceBlock contains the block at which closing was initiated, not the block at which funding was initiated.
// That means we're lenient with our peer and give its funding tx more time to confirm, to avoid having to store two distinct
// waitingSinceBlock (e.g. closingWaitingSinceBlock and fundingWaitingSinceBlock).
handleGetFundingTx(getTxResponse, d.waitingSince, d.fundingTx)
handleGetFundingTx(getTxResponse, d.waitingSince, d.fundingTx.flatMap(_.signedTx_opt))

case Event(BITCOIN_FUNDING_PUBLISH_FAILED, d: DATA_CLOSING) => handleFundingPublishFailed(d)

case Event(BITCOIN_FUNDING_TIMEOUT, d: DATA_CLOSING) => handleFundingTimeout(d)

case Event(w: WatchFundingConfirmedTriggered, d: DATA_CLOSING) =>
d.alternativeCommitments.find(_.commitInput.outPoint.txid == w.tx.txid) match {
case Some(commitments1) =>
d.alternativeCommitments.find(_.commitments.commitInput.outPoint.txid == w.tx.txid) match {
case Some(DualFundingTx(_, commitments1)) =>
// This is a corner case where:
// - we are using dual funding
// - *and* the funding tx was RBF-ed
Expand All @@ -1110,6 +1110,10 @@ class Channel(val nodeParams: NodeParams, val wallet: OnChainChannelFunder, val
log.info("channelId={} was confirmed at blockHeight={} txIndex={} with a previous funding txid={}", d.channelId, w.blockHeight, w.txIndex, w.tx.txid)
watchFundingTx(commitments1)
context.system.eventStream.publish(TransactionConfirmed(d.channelId, remoteNodeId, w.tx))
val otherFundingTxs =
d.fundingTx.toSeq.collect { case DualFundedUnconfirmedFundingTx(fundingTx) => fundingTx } ++
d.alternativeCommitments.filterNot(_.commitments.commitInput.outPoint.txid == w.tx.txid).map(_.fundingTx)
rollbackDualFundingTxs(otherFundingTxs)
val commitTx = commitments1.fullySignedLocalCommitTx(keyManager).tx
val localCommitPublished = Closing.LocalClose.claimCommitTxOutputs(keyManager, commitments1, commitTx, nodeParams.currentBlockHeight, nodeParams.onChainFeeConf)
val d1 = DATA_CLOSING(commitments1, None, d.waitingSince, alternativeCommitments = Nil, mutualCloseProposed = Nil, localCommitPublished = Some(localCommitPublished))
Expand Down
3 changes: 1 addition & 2 deletions eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/ChannelOpenDualFunded.scala
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Expand Up @@ -28,8 +28,6 @@ import fr.acinq.eclair.transactions.Scripts
import fr.acinq.eclair.wire.protocol._
import fr.acinq.eclair.{Features, RealShortChannelId}

import scala.concurrent.duration.DurationInt

/**
* Created by t-bast on 19/04/2022.
*/
Expand Down Expand Up @@ -396,6 +394,7 @@ trait ChannelOpenDualFunded extends DualFundingHandlers with ErrorHandlers {
goto(WAIT_FOR_DUAL_FUNDING_READY) using DATA_WAIT_FOR_DUAL_FUNDING_READY(commitments, shortIds, channelReady) storing() sending channelReady
case None =>
log.error(s"internal error: the funding tx that confirmed doesn't match any of our funding txs: ${confirmedTx.bin}")
rollbackDualFundingTxs(allFundingTxs.map(_.fundingTx))
goto(CLOSED)
}

Expand Down
18 changes: 17 additions & 1 deletion eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/DualFundingHandlers.scala
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Expand Up @@ -16,10 +16,11 @@

package fr.acinq.eclair.channel.fsm

import fr.acinq.bitcoin.scalacompat.{Transaction, TxIn}
import fr.acinq.eclair.blockchain.CurrentBlockHeight
import fr.acinq.eclair.blockchain.bitcoind.ZmqWatcher.WatchFundingConfirmedTriggered
import fr.acinq.eclair.channel.Helpers.Closing
import fr.acinq.eclair.channel.InteractiveTxBuilder.{FullySignedSharedTransaction, InteractiveTxParams, PartiallySignedSharedTransaction, SignedSharedTransaction}
import fr.acinq.eclair.channel.InteractiveTxBuilder._
import fr.acinq.eclair.channel._
import fr.acinq.eclair.channel.fsm.Channel.BITCOIN_FUNDING_DOUBLE_SPENT
import fr.acinq.eclair.wire.protocol.Error
Expand Down Expand Up @@ -61,13 +62,16 @@ trait DualFundingHandlers extends CommonFundingHandlers {
watchFundingTx(d.commitments)
context.system.eventStream.publish(TransactionConfirmed(d.channelId, remoteNodeId, w.tx))
// We can forget previous funding attempts now that the funding tx is confirmed.
rollbackDualFundingTxs(d.previousFundingTxs.map(_.fundingTx))
stay() using d.copy(previousFundingTxs = Nil) storing()
} else if (d.previousFundingTxs.exists(_.commitments.commitInput.outPoint.txid == w.tx.txid)) {
log.info("channelId={} was confirmed at blockHeight={} txIndex={} with a previous funding txid={}", d.channelId, w.blockHeight, w.txIndex, w.tx.txid)
val confirmed = d.previousFundingTxs.find(_.commitments.commitInput.outPoint.txid == w.tx.txid).get
watchFundingTx(confirmed.commitments)
context.system.eventStream.publish(TransactionConfirmed(d.channelId, remoteNodeId, w.tx))
// We can forget other funding attempts now that one of the funding txs is confirmed.
val otherFundingTxs = d.fundingTx +: d.previousFundingTxs.filter(_.commitments.commitInput.outPoint.txid != w.tx.txid).map(_.fundingTx)
rollbackDualFundingTxs(otherFundingTxs)
stay() using d.copy(commitments = confirmed.commitments, fundingTx = confirmed.fundingTx, previousFundingTxs = Nil) storing()
} else {
log.error(s"internal error: a funding tx confirmed that doesn't match any of our funding txs: ${w.tx.txid}")
Expand Down Expand Up @@ -109,4 +113,16 @@ trait DualFundingHandlers extends CommonFundingHandlers {
}
}

/**
* In most cases we don't need to explicitly rollback funding transactions, as the locks are automatically removed by
* bitcoind when transactions are published. But if we couldn't publish those transactions (e.g. because our peer
* never sent us their signatures, or the transaction wasn't accepted in our mempool), their inputs may still be locked.
*/
def rollbackDualFundingTxs(txs: Seq[SignedSharedTransaction]): Unit = {
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val inputs = txs.flatMap(_.tx.localInputs).distinctBy(_.serialId).map(i => TxIn(toOutPoint(i), Nil, 0))
if (inputs.nonEmpty) {
wallet.rollback(Transaction(2, inputs, Nil, 0))
}
}

}
8 changes: 4 additions & 4 deletions eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/ErrorHandlers.scala
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Expand Up @@ -196,8 +196,8 @@ trait ErrorHandlers extends CommonHandlers {
val nextData = d match {
case closing: DATA_CLOSING => closing.copy(localCommitPublished = Some(localCommitPublished))
case negotiating: DATA_NEGOTIATING => DATA_CLOSING(d.commitments, fundingTx = None, waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = Nil, negotiating.closingTxProposed.flatten.map(_.unsignedTx), localCommitPublished = Some(localCommitPublished))
case waitForFundingConfirmed: DATA_WAIT_FOR_FUNDING_CONFIRMED => DATA_CLOSING(d.commitments, fundingTx = waitForFundingConfirmed.fundingTx, waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = Nil, mutualCloseProposed = Nil, localCommitPublished = Some(localCommitPublished))
case waitForFundingConfirmed: DATA_WAIT_FOR_DUAL_FUNDING_CONFIRMED => DATA_CLOSING(d.commitments, fundingTx = waitForFundingConfirmed.signedFundingTx_opt, waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = waitForFundingConfirmed.previousFundingTxs.map(_.commitments), mutualCloseProposed = Nil, localCommitPublished = Some(localCommitPublished))
case waitForFundingConfirmed: DATA_WAIT_FOR_FUNDING_CONFIRMED => DATA_CLOSING(d.commitments, fundingTx = waitForFundingConfirmed.fundingTx.map(tx => SingleFundedUnconfirmedFundingTx(tx)), waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = Nil, mutualCloseProposed = Nil, localCommitPublished = Some(localCommitPublished))
case waitForFundingConfirmed: DATA_WAIT_FOR_DUAL_FUNDING_CONFIRMED => DATA_CLOSING(d.commitments, fundingTx = Some(DualFundedUnconfirmedFundingTx(waitForFundingConfirmed.fundingTx)), waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = waitForFundingConfirmed.previousFundingTxs, mutualCloseProposed = Nil, localCommitPublished = Some(localCommitPublished))
case _ => DATA_CLOSING(d.commitments, fundingTx = None, waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = Nil, mutualCloseProposed = Nil, localCommitPublished = Some(localCommitPublished))
}
goto(CLOSING) using nextData storing() calling doPublish(localCommitPublished, d.commitments)
Expand Down Expand Up @@ -242,8 +242,8 @@ trait ErrorHandlers extends CommonHandlers {
val nextData = d match {
case closing: DATA_CLOSING => closing.copy(remoteCommitPublished = Some(remoteCommitPublished))
case negotiating: DATA_NEGOTIATING => DATA_CLOSING(d.commitments, fundingTx = None, waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = Nil, mutualCloseProposed = negotiating.closingTxProposed.flatten.map(_.unsignedTx), remoteCommitPublished = Some(remoteCommitPublished))
case waitForFundingConfirmed: DATA_WAIT_FOR_FUNDING_CONFIRMED => DATA_CLOSING(d.commitments, fundingTx = waitForFundingConfirmed.fundingTx, waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = Nil, mutualCloseProposed = Nil, remoteCommitPublished = Some(remoteCommitPublished))
case waitForFundingConfirmed: DATA_WAIT_FOR_DUAL_FUNDING_CONFIRMED => DATA_CLOSING(d.commitments, fundingTx = waitForFundingConfirmed.signedFundingTx_opt, waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = waitForFundingConfirmed.previousFundingTxs.map(_.commitments), mutualCloseProposed = Nil, remoteCommitPublished = Some(remoteCommitPublished))
case waitForFundingConfirmed: DATA_WAIT_FOR_FUNDING_CONFIRMED => DATA_CLOSING(d.commitments, fundingTx = waitForFundingConfirmed.fundingTx.map(tx => SingleFundedUnconfirmedFundingTx(tx)), waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = Nil, mutualCloseProposed = Nil, remoteCommitPublished = Some(remoteCommitPublished))
case waitForFundingConfirmed: DATA_WAIT_FOR_DUAL_FUNDING_CONFIRMED => DATA_CLOSING(d.commitments, fundingTx = Some(DualFundedUnconfirmedFundingTx(waitForFundingConfirmed.fundingTx)), waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = waitForFundingConfirmed.previousFundingTxs, mutualCloseProposed = Nil, remoteCommitPublished = Some(remoteCommitPublished))
case _ => DATA_CLOSING(d.commitments, fundingTx = None, waitingSince = nodeParams.currentBlockHeight, alternativeCommitments = Nil, mutualCloseProposed = Nil, remoteCommitPublished = Some(remoteCommitPublished))
}
goto(CLOSING) using nextData storing() calling doPublish(remoteCommitPublished, d.commitments)
Expand Down
4 changes: 2 additions & 2 deletions ...r-core/src/main/scala/fr/acinq/eclair/wire/internal/channel/version0/ChannelCodecs0.scala
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Expand Up @@ -435,7 +435,7 @@ private[channel] object ChannelCodecs0 {
("futureRemoteCommitPublished" | optional(bool, remoteCommitPublishedCodec)) ::
("revokedCommitPublished" | listOfN(uint16, revokedCommitPublishedCodec))).map {
case commitments :: fundingTx :: waitingSince :: mutualCloseProposed :: mutualClosePublished :: localCommitPublished :: remoteCommitPublished :: nextRemoteCommitPublished :: futureRemoteCommitPublished :: revokedCommitPublished :: HNil =>
DATA_CLOSING(commitments, fundingTx, waitingSince, Nil, mutualCloseProposed, mutualClosePublished, localCommitPublished, remoteCommitPublished, nextRemoteCommitPublished, futureRemoteCommitPublished, revokedCommitPublished)
DATA_CLOSING(commitments, fundingTx.map(tx => SingleFundedUnconfirmedFundingTx(tx)), waitingSince, Nil, mutualCloseProposed, mutualClosePublished, localCommitPublished, remoteCommitPublished, nextRemoteCommitPublished, futureRemoteCommitPublished, revokedCommitPublished)
}.decodeOnly

val DATA_CLOSING_09_Codec: Codec[DATA_CLOSING] = (
Expand All @@ -450,7 +450,7 @@ private[channel] object ChannelCodecs0 {
("futureRemoteCommitPublished" | optional(bool, remoteCommitPublishedCodec)) ::
("revokedCommitPublished" | listOfN(uint16, revokedCommitPublishedCodec))).map {
case commitments :: fundingTx :: waitingSince :: mutualCloseProposed :: mutualClosePublished :: localCommitPublished :: remoteCommitPublished :: nextRemoteCommitPublished :: futureRemoteCommitPublished :: revokedCommitPublished :: HNil =>
DATA_CLOSING(commitments, fundingTx, waitingSince, Nil, mutualCloseProposed, mutualClosePublished, localCommitPublished, remoteCommitPublished, nextRemoteCommitPublished, futureRemoteCommitPublished, revokedCommitPublished)
DATA_CLOSING(commitments, fundingTx.map(tx => SingleFundedUnconfirmedFundingTx(tx)), waitingSince, Nil, mutualCloseProposed, mutualClosePublished, localCommitPublished, remoteCommitPublished, nextRemoteCommitPublished, futureRemoteCommitPublished, revokedCommitPublished)
}.decodeOnly

val channelReestablishCodec: Codec[ChannelReestablish] = (
Expand Down
2 changes: 1 addition & 1 deletion ...r-core/src/main/scala/fr/acinq/eclair/wire/internal/channel/version1/ChannelCodecs1.scala
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Expand Up @@ -285,7 +285,7 @@ private[channel] object ChannelCodecs1 {
("futureRemoteCommitPublished" | optional(bool8, remoteCommitPublishedCodec)) ::
("revokedCommitPublished" | listOfN(uint16, revokedCommitPublishedCodec))).map {
case commitments :: fundingTx :: waitingSince :: mutualCloseProposed :: mutualClosePublished :: localCommitPublished :: remoteCommitPublished :: nextRemoteCommitPublished :: futureRemoteCommitPublished :: revokedCommitPublished :: HNil =>
DATA_CLOSING(commitments, fundingTx, waitingSince, Nil, mutualCloseProposed, mutualClosePublished, localCommitPublished, remoteCommitPublished, nextRemoteCommitPublished, futureRemoteCommitPublished, revokedCommitPublished)
DATA_CLOSING(commitments, fundingTx.map(tx => SingleFundedUnconfirmedFundingTx(tx)), waitingSince, Nil, mutualCloseProposed, mutualClosePublished, localCommitPublished, remoteCommitPublished, nextRemoteCommitPublished, futureRemoteCommitPublished, revokedCommitPublished)
}.decodeOnly

val DATA_WAIT_FOR_REMOTE_PUBLISH_FUTURE_COMMITMENT_26_Codec: Codec[DATA_WAIT_FOR_REMOTE_PUBLISH_FUTURE_COMMITMENT] = (
Expand Down
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