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Allow splicing on non dual-funded channels #2727

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Sep 26, 2023
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Allow splicing on non dual-funded channels #2727

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158259a
Allow splicing on non dual-funded channels
t-bast Aug 22, 2023
a061f2f
Rename requestedChannelReserve_opt
t-bast Sep 11, 2023
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4 changes: 2 additions & 2 deletions eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelData.scala
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Expand Up @@ -627,7 +627,7 @@ case class LocalParams(nodeId: PublicKey,
fundingKeyPath: DeterministicWallet.KeyPath,
dustLimit: Satoshi,
maxHtlcValueInFlightMsat: MilliSatoshi,
requestedChannelReserve_opt: Option[Satoshi],
initialRequestedChannelReserve_opt: Option[Satoshi],
htlcMinimum: MilliSatoshi,
toSelfDelay: CltvExpiryDelta,
maxAcceptedHtlcs: Int,
Expand All @@ -642,7 +642,7 @@ case class LocalParams(nodeId: PublicKey,
case class RemoteParams(nodeId: PublicKey,
dustLimit: Satoshi,
maxHtlcValueInFlightMsat: UInt64, // this is not MilliSatoshi because it can exceed the total amount of MilliSatoshi
requestedChannelReserve_opt: Option[Satoshi],
initialRequestedChannelReserve_opt: Option[Satoshi],
htlcMinimum: MilliSatoshi,
toSelfDelay: CltvExpiryDelta,
maxAcceptedHtlcs: Int,
Expand Down
16 changes: 8 additions & 8 deletions eclair-core/src/main/scala/fr/acinq/eclair/channel/Commitments.scala
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Expand Up @@ -27,8 +27,8 @@ case class ChannelParams(channelId: ByteVector32,
channelFlags: ChannelFlags) {

require(channelFeatures.paysDirectlyToWallet == localParams.walletStaticPaymentBasepoint.isDefined, s"localParams.walletStaticPaymentBasepoint must be defined only for commitments that pay directly to our wallet (channel features: $channelFeatures")
require(channelFeatures.hasFeature(Features.DualFunding) == localParams.requestedChannelReserve_opt.isEmpty, "custom local channel reserve is incompatible with dual-funded channels")
require(channelFeatures.hasFeature(Features.DualFunding) == remoteParams.requestedChannelReserve_opt.isEmpty, "custom remote channel reserve is incompatible with dual-funded channels")
require(channelFeatures.hasFeature(Features.DualFunding) == localParams.initialRequestedChannelReserve_opt.isEmpty, "custom local channel reserve is incompatible with dual-funded channels")
require(channelFeatures.hasFeature(Features.DualFunding) == remoteParams.initialRequestedChannelReserve_opt.isEmpty, "custom remote channel reserve is incompatible with dual-funded channels")

val commitmentFormat: CommitmentFormat = channelFeatures.commitmentFormat
val channelType: SupportedChannelType = channelFeatures.channelType
Expand Down Expand Up @@ -103,17 +103,17 @@ case class ChannelParams(channelId: ByteVector32,
def minDepthDualFunding(defaultMinDepth: Int, sharedTx: SharedTransaction): Option[Long] = minDepthDualFunding(defaultMinDepth, sharedTx.sharedOutput.amount, Some(sharedTx.remoteInputs.nonEmpty))

/** Channel reserve that applies to our funds. */
def localChannelReserveForCapacity(capacity: Satoshi): Satoshi = if (channelFeatures.hasFeature(Features.DualFunding)) {
def localChannelReserveForCapacity(capacity: Satoshi, isSplice: Boolean): Satoshi = if (channelFeatures.hasFeature(Features.DualFunding) || isSplice) {
(capacity / 100).max(remoteParams.dustLimit)
} else {
remoteParams.requestedChannelReserve_opt.get // this is guarded by a require() in Params
remoteParams.initialRequestedChannelReserve_opt.get // this is guarded by a require() in Params
}

/** Channel reserve that applies to our peer's funds. */
def remoteChannelReserveForCapacity(capacity: Satoshi): Satoshi = if (channelFeatures.hasFeature(Features.DualFunding)) {
def remoteChannelReserveForCapacity(capacity: Satoshi, isSplice: Boolean): Satoshi = if (channelFeatures.hasFeature(Features.DualFunding) || isSplice) {
(capacity / 100).max(localParams.dustLimit)
} else {
localParams.requestedChannelReserve_opt.get // this is guarded by a require() in Params
localParams.initialRequestedChannelReserve_opt.get // this is guarded by a require() in Params
}

/**
Expand Down Expand Up @@ -268,10 +268,10 @@ case class Commitment(fundingTxIndex: Long,
val capacity: Satoshi = commitInput.txOut.amount

/** Channel reserve that applies to our funds. */
def localChannelReserve(params: ChannelParams): Satoshi = params.localChannelReserveForCapacity(capacity)
def localChannelReserve(params: ChannelParams): Satoshi = params.localChannelReserveForCapacity(capacity, fundingTxIndex > 0)

/** Channel reserve that applies to our peer's funds. */
def remoteChannelReserve(params: ChannelParams): Satoshi = params.remoteChannelReserveForCapacity(capacity)
def remoteChannelReserve(params: ChannelParams): Satoshi = params.remoteChannelReserveForCapacity(capacity, fundingTxIndex > 0)

// NB: when computing availableBalanceForSend and availableBalanceForReceive, the initiator keeps an extra buffer on
// top of its usual channel reserve to avoid getting channels stuck in case the on-chain feerate increases (see
Expand Down
4 changes: 2 additions & 2 deletions eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/ChannelOpenDualFunded.scala
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Expand Up @@ -148,7 +148,7 @@ trait ChannelOpenDualFunded extends DualFundingHandlers with ErrorHandlers {
nodeId = remoteNodeId,
dustLimit = open.dustLimit,
maxHtlcValueInFlightMsat = open.maxHtlcValueInFlightMsat,
requestedChannelReserve_opt = None, // channel reserve will be computed based on channel capacity
initialRequestedChannelReserve_opt = None, // channel reserve will be computed based on channel capacity
htlcMinimum = open.htlcMinimum,
toSelfDelay = open.toSelfDelay,
maxAcceptedHtlcs = open.maxAcceptedHtlcs,
Expand Down Expand Up @@ -247,7 +247,7 @@ trait ChannelOpenDualFunded extends DualFundingHandlers with ErrorHandlers {
nodeId = remoteNodeId,
dustLimit = accept.dustLimit,
maxHtlcValueInFlightMsat = accept.maxHtlcValueInFlightMsat,
requestedChannelReserve_opt = None, // channel reserve will be computed based on channel capacity
initialRequestedChannelReserve_opt = None, // channel reserve will be computed based on channel capacity
htlcMinimum = accept.htlcMinimum,
toSelfDelay = accept.toSelfDelay,
maxAcceptedHtlcs = accept.maxAcceptedHtlcs,
Expand Down
8 changes: 4 additions & 4 deletions eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/ChannelOpenSingleFunded.scala
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Expand Up @@ -85,7 +85,7 @@ trait ChannelOpenSingleFunded extends SingleFundingHandlers with ErrorHandlers {
pushMsat = input.pushAmount_opt.getOrElse(0 msat),
dustLimitSatoshis = input.localParams.dustLimit,
maxHtlcValueInFlightMsat = UInt64(input.localParams.maxHtlcValueInFlightMsat.toLong),
channelReserveSatoshis = input.localParams.requestedChannelReserve_opt.get,
channelReserveSatoshis = input.localParams.initialRequestedChannelReserve_opt.get,
htlcMinimumMsat = input.localParams.htlcMinimum,
feeratePerKw = input.commitTxFeerate,
toSelfDelay = input.localParams.toSelfDelay,
Expand Down Expand Up @@ -114,7 +114,7 @@ trait ChannelOpenSingleFunded extends SingleFundingHandlers with ErrorHandlers {
nodeId = remoteNodeId,
dustLimit = open.dustLimitSatoshis,
maxHtlcValueInFlightMsat = open.maxHtlcValueInFlightMsat,
requestedChannelReserve_opt = Some(open.channelReserveSatoshis), // our peer requires us to always have at least that much satoshis in our balance
initialRequestedChannelReserve_opt = Some(open.channelReserveSatoshis), // our peer requires us to always have at least that much satoshis in our balance
htlcMinimum = open.htlcMinimumMsat,
toSelfDelay = open.toSelfDelay,
maxAcceptedHtlcs = open.maxAcceptedHtlcs,
Expand All @@ -136,7 +136,7 @@ trait ChannelOpenSingleFunded extends SingleFundingHandlers with ErrorHandlers {
val accept = AcceptChannel(temporaryChannelId = open.temporaryChannelId,
dustLimitSatoshis = d.initFundee.localParams.dustLimit,
maxHtlcValueInFlightMsat = UInt64(d.initFundee.localParams.maxHtlcValueInFlightMsat.toLong),
channelReserveSatoshis = d.initFundee.localParams.requestedChannelReserve_opt.get,
channelReserveSatoshis = d.initFundee.localParams.initialRequestedChannelReserve_opt.get,
minimumDepth = minimumDepth.getOrElse(0),
htlcMinimumMsat = d.initFundee.localParams.htlcMinimum,
toSelfDelay = d.initFundee.localParams.toSelfDelay,
Expand Down Expand Up @@ -172,7 +172,7 @@ trait ChannelOpenSingleFunded extends SingleFundingHandlers with ErrorHandlers {
nodeId = remoteNodeId,
dustLimit = accept.dustLimitSatoshis,
maxHtlcValueInFlightMsat = accept.maxHtlcValueInFlightMsat,
requestedChannelReserve_opt = Some(accept.channelReserveSatoshis), // our peer requires us to always have at least that much satoshis in our balance
initialRequestedChannelReserve_opt = Some(accept.channelReserveSatoshis), // our peer requires us to always have at least that much satoshis in our balance
htlcMinimum = accept.htlcMinimumMsat,
toSelfDelay = accept.toSelfDelay,
maxAcceptedHtlcs = accept.maxAcceptedHtlcs,
Expand Down
2 changes: 1 addition & 1 deletion eclair-core/src/main/scala/fr/acinq/eclair/channel/fund/InteractiveTxBuilder.scala
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Expand Up @@ -649,7 +649,7 @@ private class InteractiveTxBuilder(replyTo: ActorRef[InteractiveTxBuilder.Respon
}

val sharedInput_opt = fundingParams.sharedInput_opt.map(_ => {
val remoteReserve = channelParams.remoteChannelReserveForCapacity(fundingParams.fundingAmount)
val remoteReserve = channelParams.remoteChannelReserveForCapacity(fundingParams.fundingAmount, isSplice = true)
// We ignore the reserve requirement if we are splicing funds into the channel, which increases the size of the reserve.
if (sharedOutput.remoteAmount < remoteReserve && remoteOutputs.nonEmpty && localInputs.isEmpty) {
log.warn("invalid interactive tx: peer takes too much funds out and falls below the channel reserve ({} < {})", sharedOutput.remoteAmount, remoteReserve)
Expand Down
2 changes: 1 addition & 1 deletion eclair-core/src/main/scala/fr/acinq/eclair/io/OpenChannelInterceptor.scala
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Expand Up @@ -97,7 +97,7 @@ object OpenChannelInterceptor {
nodeParams.channelKeyManager.newFundingKeyPath(isInitiator), // we make sure that initiator and non-initiator key paths end differently
dustLimit = nodeParams.channelConf.dustLimit,
maxHtlcValueInFlightMsat = maxHtlcValueInFlightMsat,
requestedChannelReserve_opt = if (dualFunded) None else Some((fundingAmount * nodeParams.channelConf.reserveToFundingRatio).max(nodeParams.channelConf.dustLimit)), // BOLT #2: make sure that our reserve is above our dust limit
initialRequestedChannelReserve_opt = if (dualFunded) None else Some((fundingAmount * nodeParams.channelConf.reserveToFundingRatio).max(nodeParams.channelConf.dustLimit)), // BOLT #2: make sure that our reserve is above our dust limit
htlcMinimum = nodeParams.channelConf.htlcMinimum,
toSelfDelay = nodeParams.channelConf.toRemoteDelay, // we choose their delay
maxAcceptedHtlcs = nodeParams.channelConf.maxAcceptedHtlcs,
Expand Down
2 changes: 1 addition & 1 deletion ...ir-core/src/main/scala/fr/acinq/eclair/wire/internal/channel/version0/ChannelTypes0.scala
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Expand Up @@ -199,7 +199,7 @@ private[channel] object ChannelTypes0 {
nodeId = nodeId,
dustLimit = dustLimit,
maxHtlcValueInFlightMsat = maxHtlcValueInFlightMsat,
requestedChannelReserve_opt = requestedChannelReserve_opt,
initialRequestedChannelReserve_opt = requestedChannelReserve_opt,
htlcMinimum = htlcMinimum,
toSelfDelay = toSelfDelay,
maxAcceptedHtlcs = maxAcceptedHtlcs,
Expand Down
1 change: 0 additions & 1 deletion ...r-core/src/main/scala/fr/acinq/eclair/wire/internal/channel/version4/ChannelCodecs4.scala
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Expand Up @@ -3,7 +3,6 @@ package fr.acinq.eclair.wire.internal.channel.version4
import fr.acinq.bitcoin.scalacompat.Crypto.PublicKey
import fr.acinq.bitcoin.scalacompat.DeterministicWallet.KeyPath
import fr.acinq.bitcoin.scalacompat.{OutPoint, ScriptWitness, Transaction, TxOut}
import fr.acinq.eclair.blockchain.fee
import fr.acinq.eclair.blockchain.fee.{ConfirmationPriority, ConfirmationTarget}
import fr.acinq.eclair.channel.LocalFundingStatus._
import fr.acinq.eclair.channel._
Expand Down
4 changes: 2 additions & 2 deletions eclair-core/src/test/resources/nonreg/codecs/000003-DATA_NORMAL/fundee-announced/data.json
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Expand Up @@ -10,7 +10,7 @@
"fundingKeyPath" : [ 1457788542, 1007597768, 1455922339, 479707306 ],
"dustLimit" : 546,
"maxHtlcValueInFlightMsat" : 5000000000,
"requestedChannelReserve_opt" : 167772,
"initialRequestedChannelReserve_opt" : 167772,
"htlcMinimum" : 1,
"toSelfDelay" : 720,
"maxAcceptedHtlcs" : 30,
Expand All @@ -29,7 +29,7 @@
"nodeId" : "034fe52e98a0e9d3c21b767e1b371881265d8c7578c21f5afd6d6438da10348b36",
"dustLimit" : 573,
"maxHtlcValueInFlightMsat" : 16609443000,
"requestedChannelReserve_opt" : 167772,
"initialRequestedChannelReserve_opt" : 167772,
"htlcMinimum" : 1000,
"toSelfDelay" : 2016,
"maxAcceptedHtlcs" : 483,
Expand Down
4 changes: 2 additions & 2 deletions eclair-core/src/test/resources/nonreg/codecs/000003-DATA_NORMAL/funder/data.json
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Expand Up @@ -10,7 +10,7 @@
"fundingKeyPath" : [ 3561221353, 3653515793, 2711311691, 2863050005 ],
"dustLimit" : 546,
"maxHtlcValueInFlightMsat" : 1000000000,
"requestedChannelReserve_opt" : 150000,
"initialRequestedChannelReserve_opt" : 150000,
"htlcMinimum" : 1,
"toSelfDelay" : 144,
"maxAcceptedHtlcs" : 30,
Expand All @@ -29,7 +29,7 @@
"nodeId" : "0269a94e8b32c005e4336bfb743c08a6e9beb13d940d57c479d95c8e687ccbdb9f",
"dustLimit" : 573,
"maxHtlcValueInFlightMsat" : 14850000000,
"requestedChannelReserve_opt" : 150000,
"initialRequestedChannelReserve_opt" : 150000,
"htlcMinimum" : 1000,
"toSelfDelay" : 1802,
"maxAcceptedHtlcs" : 483,
Expand Down
4 changes: 2 additions & 2 deletions eclair-core/src/test/resources/nonreg/codecs/020002-DATA_NORMAL/funder-announced/data.json
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Expand Up @@ -10,7 +10,7 @@
"fundingKeyPath" : [ 2353764507, 3184449568, 2809819526, 3258060413, 392846475, 1545000620, 720603293, 1808318336, 2147483649 ],
"dustLimit" : 546,
"maxHtlcValueInFlightMsat" : 20000000000,
"requestedChannelReserve_opt" : 150000,
"initialRequestedChannelReserve_opt" : 150000,
"htlcMinimum" : 1,
"toSelfDelay" : 720,
"maxAcceptedHtlcs" : 30,
Expand All @@ -36,7 +36,7 @@
"nodeId" : "027455aef8453d92f4706b560b61527cc217ddf14da41770e8ed6607190a1851b8",
"dustLimit" : 573,
"maxHtlcValueInFlightMsat" : 14850000000,
"requestedChannelReserve_opt" : 150000,
"initialRequestedChannelReserve_opt" : 150000,
"htlcMinimum" : 1,
"toSelfDelay" : 1802,
"maxAcceptedHtlcs" : 483,
Expand Down
4 changes: 2 additions & 2 deletions .../src/test/resources/nonreg/codecs/030000-DATA_WAIT_FOR_FUNDING_CONFIRMED/funder/data.json
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Expand Up @@ -10,7 +10,7 @@
"fundingKeyPath" : [ 4092535092, 4227137620, 3959690417, 2298849496, 2106263857, 1090614243, 1495530077, 1280982866, 2147483649 ],
"dustLimit" : 1100,
"maxHtlcValueInFlightMsat" : 500000000,
"requestedChannelReserve_opt" : 10000,
"initialRequestedChannelReserve_opt" : 10000,
"htlcMinimum" : 0,
"toSelfDelay" : 144,
"maxAcceptedHtlcs" : 100,
Expand All @@ -32,7 +32,7 @@
"nodeId" : "02bbbb671d15145722fb8c28d732cddb249bcc6652ed2b297ff1f77a18371b1e63",
"dustLimit" : 1000,
"maxHtlcValueInFlightMsat" : 18446744073709551615,
"requestedChannelReserve_opt" : 20000,
"initialRequestedChannelReserve_opt" : 20000,
"htlcMinimum" : 1000,
"toSelfDelay" : 144,
"maxAcceptedHtlcs" : 30,
Expand Down
4 changes: 2 additions & 2 deletions ...core/src/test/resources/nonreg/codecs/03000a-DATA_WAIT_FOR_CHANNEL_READY/funder/data.json
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Expand Up @@ -10,7 +10,7 @@
"fundingKeyPath" : [ 303987973, 3198768511, 3783619274, 2277156978, 1699864653, 63358126, 3265052696, 516813756, 2147483649 ],
"dustLimit" : 1100,
"maxHtlcValueInFlightMsat" : 500000000,
"requestedChannelReserve_opt" : 10000,
"initialRequestedChannelReserve_opt" : 10000,
"htlcMinimum" : 0,
"toSelfDelay" : 144,
"maxAcceptedHtlcs" : 100,
Expand All @@ -33,7 +33,7 @@
"nodeId" : "02bbbb671d15145722fb8c28d732cddb249bcc6652ed2b297ff1f77a18371b1e63",
"dustLimit" : 1000,
"maxHtlcValueInFlightMsat" : 1000000000,
"requestedChannelReserve_opt" : 20000,
"initialRequestedChannelReserve_opt" : 20000,
"htlcMinimum" : 1000,
"toSelfDelay" : 144,
"maxAcceptedHtlcs" : 30,
Expand Down
4 changes: 2 additions & 2 deletions eclair-core/src/test/scala/fr/acinq/eclair/TestConstants.scala
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Expand Up @@ -234,7 +234,7 @@ object TestConstants {
fundingSatoshis,
unlimitedMaxHtlcValueInFlight = false,
).copy(
requestedChannelReserve_opt = Some(10_000 sat) // Bob will need to keep that much satoshis in his balance
initialRequestedChannelReserve_opt = Some(10_000 sat) // Bob will need to keep that much satoshis in his balance
)
}

Expand Down Expand Up @@ -396,7 +396,7 @@ object TestConstants {
fundingSatoshis,
unlimitedMaxHtlcValueInFlight = false,
).copy(
requestedChannelReserve_opt = Some(20_000 sat) // Alice will need to keep that much satoshis in her balance
initialRequestedChannelReserve_opt = Some(20_000 sat) // Alice will need to keep that much satoshis in her balance
)
}

Expand Down
6 changes: 3 additions & 3 deletions ...r-core/src/test/scala/fr/acinq/eclair/channel/states/ChannelStateTestsHelperMethods.scala
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Expand Up @@ -154,7 +154,7 @@ trait ChannelStateTestsBase extends Assertions with Eventually {
.modify(_.onChainFeeConf.spendAnchorWithoutHtlcs).setToIf(tags.contains(ChannelStateTestsTags.DontSpendAnchorWithoutHtlcs))(false)
val wallet = wallet_opt match {
case Some(wallet) => wallet
case None => if (tags.contains(ChannelStateTestsTags.DualFunding)) new SingleKeyOnChainWallet() else new DummyOnChainWallet()
case None => if (tags.contains(ChannelStateTestsTags.DualFunding) || tags.contains(ChannelStateTestsTags.Splicing)) new SingleKeyOnChainWallet() else new DummyOnChainWallet()
}
val alice: TestFSMRef[ChannelState, ChannelData, Channel] = {
implicit val system: ActorSystem = systemA
Expand Down Expand Up @@ -213,15 +213,15 @@ trait ChannelStateTestsBase extends Assertions with Eventually {
.modify(_.maxHtlcValueInFlightMsat).setToIf(tags.contains(ChannelStateTestsTags.AliceLowMaxHtlcValueInFlight))(150_000_000 msat)
.modify(_.dustLimit).setToIf(tags.contains(ChannelStateTestsTags.HighDustLimitDifferenceAliceBob))(5000 sat)
.modify(_.dustLimit).setToIf(tags.contains(ChannelStateTestsTags.HighDustLimitDifferenceBobAlice))(1000 sat)
.modify(_.requestedChannelReserve_opt).setToIf(tags.contains(ChannelStateTestsTags.DualFunding))(None)
.modify(_.initialRequestedChannelReserve_opt).setToIf(tags.contains(ChannelStateTestsTags.DualFunding))(None)
.modify(_.upfrontShutdownScript_opt).setToIf(tags.contains(ChannelStateTestsTags.UpfrontShutdownScript))(Some(Script.write(Script.pay2wpkh(Await.result(wallet.getP2wpkhPubkey(), 10 seconds)))))
val bobParams = Bob.channelParams
.modify(_.initFeatures).setTo(bobInitFeatures)
.modify(_.walletStaticPaymentBasepoint).setToIf(channelType.paysDirectlyToWallet)(Some(Await.result(wallet.getP2wpkhPubkey(), 10 seconds)))
.modify(_.maxHtlcValueInFlightMsat).setToIf(tags.contains(ChannelStateTestsTags.NoMaxHtlcValueInFlight))(Long.MaxValue.msat)
.modify(_.dustLimit).setToIf(tags.contains(ChannelStateTestsTags.HighDustLimitDifferenceAliceBob))(1000 sat)
.modify(_.dustLimit).setToIf(tags.contains(ChannelStateTestsTags.HighDustLimitDifferenceBobAlice))(5000 sat)
.modify(_.requestedChannelReserve_opt).setToIf(tags.contains(ChannelStateTestsTags.DualFunding))(None)
.modify(_.initialRequestedChannelReserve_opt).setToIf(tags.contains(ChannelStateTestsTags.DualFunding))(None)
.modify(_.upfrontShutdownScript_opt).setToIf(tags.contains(ChannelStateTestsTags.UpfrontShutdownScript))(Some(Script.write(Script.pay2wpkh(Await.result(wallet.getP2wpkhPubkey(), 10 seconds)))))

(aliceParams, bobParams, channelType)
Expand Down
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