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lnwallet: precalculate fees in mSAT to avoid multiple conversions

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This commit is contained in:
Olaoluwa Osuntokun 2018-02-24 19:19:24 -08:00
parent 217166fb10
commit ac90a8288e
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GPG Key ID: 964EA263DD637C21
1 changed files with 33 additions and 29 deletions
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62
lnwallet/channel.go
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@ -2139,6 +2139,7 @@ func (lc *LightningChannel) createCommitmentTx(c *commitment,
// With the weight known, we can now calculate the commitment fee,
// ensuring that we account for any dust outputs trimmed above.
commitFee := c.feePerKw.FeeForWeight(totalCommitWeight)
commitFeeMSat := lnwire.NewMSatFromSatoshis(commitFee)
// Currently, within the protocol, the initiator always pays the fees.
// So we'll subtract the fee amount from the balance of the current
@ -2149,13 +2150,13 @@ func (lc *LightningChannel) createCommitmentTx(c *commitment,
ourBalance = 0
case lc.channelState.IsInitiator:
ourBalance -= lnwire.NewMSatFromSatoshis(commitFee)
ourBalance -= commitFeeMSat
case !lc.channelState.IsInitiator && commitFee > theirBalance.ToSatoshis():
theirBalance = 0
case !lc.channelState.IsInitiator:
theirBalance -= lnwire.NewMSatFromSatoshis(commitFee)
theirBalance -= commitFeeMSat
}
var (
@ -3227,57 +3228,58 @@ func (lc *LightningChannel) validateCommitmentSanity(theirLogCounter,
validateUpdates := func(updates []*PaymentDescriptor,
constraints *channeldb.ChannelConfig) error {
// We keep track of the number of HTLCs in flight for
// the commitment, and the amount in flight.
// We keep track of the number of HTLCs in flight for the
// commitment, and the amount in flight.
var numInFlight uint16
var amtInFlight lnwire.MilliSatoshi
// Go through all updates, checking that they don't
// violate the channel constraints.
// Go through all updates, checking that they don't violate the
// channel constraints.
for _, entry := range updates {
if entry.EntryType == Add {
// An HTLC is being added, this will
// add to the number and amount in
// flight.
// An HTLC is being added, this will add to the
// number and amount in flight.
amtInFlight += entry.Amount
numInFlight++
// Check that the value of the HTLC they
// added is above our minimum.
// Check that the value of the HTLC they added
// is above our minimum.
if entry.Amount < constraints.MinHTLC {
return ErrBelowMinHTLC
}
}
}
// Now that we know the total value of added HTLCs,
// we check that this satisfy the MaxPendingAmont
// contraint.
// Now that we know the total value of added HTLCs, we check
// that this satisfy the MaxPendingAmont contraint.
if amtInFlight > constraints.MaxPendingAmount {
return ErrMaxPendingAmount
}
// In this step, we verify that the total number of
// active HTLCs does not exceed the constraint of the
// maximum number of HTLCs in flight.
// In this step, we verify that the total number of active
// HTLCs does not exceed the constraint of the maximum number
// of HTLCs in flight.
if numInFlight > constraints.MaxAcceptedHtlcs {
return ErrMaxHTLCNumber
}
return nil
}
// First check that the remote updates won't violate it's
// channel constraints.
err := validateUpdates(filteredView.theirUpdates,
lc.remoteChanCfg)
// First check that the remote updates won't violate it's channel
// constraints.
err := validateUpdates(
filteredView.theirUpdates, lc.remoteChanCfg,
)
if err != nil {
return err
}
// Secondly check that our updates won't violate our
// channel constraints.
err = validateUpdates(filteredView.ourUpdates,
lc.localChanCfg)
// Secondly check that our updates won't violate our channel
// constraints.
err = validateUpdates(
filteredView.ourUpdates, lc.localChanCfg,
)
if err != nil {
return err
}
@ -3836,11 +3838,13 @@ func (lc *LightningChannel) AddHTLC(htlc *lnwire.UpdateAddHTLC) (uint64, error)
OnionBlob: htlc.OnionBlob[:],
}
// Make sure adding this HTLC won't violate any of the constrainst
// we must keep on our commitment transaction.
// Make sure adding this HTLC won't violate any of the constraints we
// must keep on our commitment transaction.
remoteACKedIndex := lc.localCommitChain.tail().theirMessageIndex
if err := lc.validateCommitmentSanity(remoteACKedIndex,
lc.localUpdateLog.logIndex, true, pd); err != nil {
err := lc.validateCommitmentSanity(
remoteACKedIndex, lc.localUpdateLog.logIndex, true, pd,
)
if err != nil {
return 0, err
}