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lnwallet: add fun to create initial Commitment Tx

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* Forgot we assume mal fix, need to go back and update the reservation
workflow
This commit is contained in:
Olaoluwa Osuntokun 2015-12-16 22:58:49 -06:00
parent 48c1c39dc9
commit feb00e04c4
1 changed files with 66 additions and 0 deletions
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66
lnwallet/channel.go
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@ -6,9 +6,17 @@ import (
"li.lan/labs/plasma/chainntfs"
"li.lan/labs/plasma/revocation"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/btcsuite/btcwallet/walletdb"
)
const (
// TODO(roasbeef): make not random value
MaxPendingPayments = 10
)
// P2SHify...
func P2SHify(scriptBytes []byte) ([]byte, error) {
@ -19,6 +27,64 @@ func P2SHify(scriptBytes []byte) ([]byte, error) {
return bldr.Script()
}
// createCommitTx...
func createCommitTx(fundingOutput *wire.TxIn, ourKey, theirKey *btcec.PublicKey,
revokeHash [32]byte, csvTimeout int64, amtToUs,
amtToThem btcutil.Amount) (*wire.MsgTx, error) {
// First, we create the script paying to us. This script is spendable
// under two conditions: either the 'csvTimeout' has passed and we can
// redeem our funds, or they have the pre-image to 'revokeHash'.
scriptToUs := txscript.NewScriptBuilder()
scriptToUs.AddOp(txscript.OP_HASH160)
scriptToUs.AddData(revokeHash[:])
scriptToUs.AddOp(txscript.OP_EQUAL)
scriptToUs.AddOp(txscript.OP_IF)
scriptToUs.AddData(theirKey.SerializeCompressed())
scriptToUs.AddOp(txscript.OP_ELSE)
scriptToUs.AddInt64(csvTimeout)
scriptToUs.AddOp(txscript.OP_NOP3) // CSV
scriptToUs.AddOp(txscript.OP_DROP)
scriptToUs.AddData(ourKey.SerializeCompressed())
scriptToUs.AddOp(txscript.OP_ENDIF)
scriptToUs.AddOp(txscript.OP_CHECKSIG)
// TODO(roasbeef): store
ourRedeemScript, err := scriptToUs.Script()
if err != nil {
return nil, err
}
payToUsScriptHash, err := P2SHify(ourRedeemScript)
if err != nil {
return nil, err
}
// Next, we create the script paying to them. This is just a regular
// P2PKH (wrapped in P2SH) with their key.
scriptToThem := txscript.NewScriptBuilder()
scriptToThem.AddOp(txscript.OP_DUP)
scriptToThem.AddOp(txscript.OP_HASH160)
scriptToThem.AddData(btcutil.Hash160(theirKey.SerializeCompressed()))
scriptToThem.AddOp(txscript.OP_EQUALVERIFY)
scriptToThem.AddOp(txscript.OP_CHECKSIG)
theirRedeemScript, err := scriptToThem.Script()
if err != nil {
return nil, err
}
payToThemScriptHash, err := P2SHify(theirRedeemScript)
if err != nil {
return nil, err
}
// TODO(roasbeef): sort outputs?
commitTx := wire.NewMsgTx()
commitTx.AddTxIn(fundingOutput)
commitTx.AddTxOut(wire.NewTxOut(int64(amtToUs), payToUsScriptHash))
commitTx.AddTxOut(wire.NewTxOut(int64(amtToThem), payToThemScriptHash))
return commitTx, nil
}
type nodeId [32]byte