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lnwallet: properly set sequence number in tx for CSV usage

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This commit is contained in:
Olaoluwa Osuntokun 2015-12-28 23:41:58 -06:00
parent 774192ecc7
commit ef7a2aa553
1 changed files with 26 additions and 1 deletions
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27
lnwallet/channel.go
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@ -4,6 +4,7 @@ import (
"sync"
"li.lan/labs/plasma/chainntfs"
"li.lan/labs/plasma/channeldb"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/txscript"
@ -15,6 +16,9 @@ import (
const (
// TODO(roasbeef): make not random value
MaxPendingPayments = 10
SequenceLockTimeSeconds = uint32(1 << 22)
SequenceLockTimeMask = uint32(0x0000ffff)
)
// LightningChannel...
@ -43,7 +47,6 @@ type LightningChannel struct {
// newLightningChannel...
func newLightningChannel(wallet *LightningWallet, events *chainntnfs.ChainNotifier,
chanDB *ChannelDB, state OpenChannelState) (*LightningChannel, error) {
chanDB *channeldb.DB, state channeldb.OpenChannel) (*LightningChannel, error) {
return &LightningChannel{
@ -151,6 +154,9 @@ func createCommitTx(fundingOutput *wire.TxIn, ourKey, theirKey *btcec.PublicKey,
// the transaction itself.
commitTx := wire.NewMsgTx()
commitTx.AddTxIn(fundingOutput)
// TODO(roasbeef): we default to blocks, make configurable as part of
// channel reservation.
commitTx.TxIn[0].Sequence = lockTimeToSequence(false, csvTimeout)
commitTx.AddTxOut(wire.NewTxOut(int64(channelAmt), payToUsScriptHash))
commitTx.AddTxOut(wire.NewTxOut(int64(channelAmt), payToThemScriptHash))
@ -161,6 +167,25 @@ func createCommitTx(fundingOutput *wire.TxIn, ourKey, theirKey *btcec.PublicKey,
return commitTx, nil
}
// lockTimeToSequence converts the passed relative locktime to a sequence
// number in accordance to BIP-68.
// See: https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki
// * (Compatibility)
func lockTimeToSequence(isSeconds bool, locktime uint32) uint32 {
if !isSeconds {
// The locktime is to be expressed in confirmations. Apply the
// mask to restrict the number of confirmations to 65,535 or
// 1.25 years.
return SequenceLockTimeMask & locktime
}
// Set the 22nd bit which indicates the lock time is in seconds, then
// shift the locktime over by 9 since the time granularity is in
// 512-second intervals (2^9). This results in a max lock-time of
// 33,554,431 seconds, or 1.06 years.
return SequenceLockTimeSeconds | (locktime >> 9)
}
//TODO(j): Creates a CLTV-only funding Tx (reserve is *REQUIRED*)
//This works for only CLTV soft-fork (no CSV/segwit soft-fork in yet)
//