276 lines
8.2 KiB
Go
276 lines
8.2 KiB
Go
package lnwallet
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import (
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"bytes"
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"sync"
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"time"
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"li.lan/labs/plasma/chainntfs"
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"li.lan/labs/plasma/revocation"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/txscript"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/btcsuite/btcwallet/walletdb"
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)
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const (
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// TODO(roasbeef): make not random value
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MaxPendingPayments = 10
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)
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type nodeId [32]byte
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// OpenChannelState...
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// TODO(roasbeef): script gen methods on this?
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type OpenChannelState struct {
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fundingType FundingType
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// Hash? or Their current pubKey?
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// TODO(roasbeef): switch to Tadge's LNId
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theirLNID [32]byte
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minFeePerKb btcutil.Amount
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//Our reserve. assume symmetric reserve amounts
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reserveAmount btcutil.Amount
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ourCommitKey *btcec.PrivateKey
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theirCommitKey *btcec.PublicKey
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capacity btcutil.Amount
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ourBalance btcutil.Amount
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theirBalance btcutil.Amount
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theirCommitTx *wire.MsgTx
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ourCommitTx *wire.MsgTx
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fundingTx *wire.MsgTx
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multiSigKey *btcec.PrivateKey
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fundingRedeemScript []byte
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ourShaChain *revocation.HyperShaChain
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theirShaChain *revocation.HyperShaChain
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// Final delivery address
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ourDeliveryAddress btcutil.Address
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theirDeliveryAddress btcutil.Address
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// In blocks
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htlcTimeout uint32
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csvDelay uint32
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numUpdates uint64
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totalSatoshisSent uint64
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totalSatoshisReceived uint64
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// TODO(roasbeef): track fees?
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creationTime time.Time
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}
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func (o *OpenChannelState) Encode(b bytes.Buffer) error {
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return nil
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}
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func (o *OpenChannelState) Decode(b bytes.Buffer) error {
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return nil
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}
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func newOpenChannelState(fType FundingType, ID [32]byte) *OpenChannelState {
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return &OpenChannelState{fundingType: fType, theirLNID: ID}
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}
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// LightningChannel...
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// TODO(roasbeef): future peer struct should embed this struct
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type LightningChannel struct {
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wallet *LightningWallet
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channelEvents *chainntnfs.ChainNotifier
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// TODO(roasbeef): Stores all previous R values + timeouts for each
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// commitment update, plus some other meta-data...Or just use OP_RETURN
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// to help out?
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// currently going for: nSequence/nLockTime overloading
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channelNamespace walletdb.Namespace
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// stateMtx protects concurrent access to the state struct.
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stateMtx sync.RWMutex
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channelState OpenChannelState
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// TODO(roasbeef): create and embed 'Service' interface w/ below?
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started int32
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shutdown int32
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quit chan struct{}
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wg sync.WaitGroup
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}
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// newLightningChannel...
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func newLightningChannel(wallet *LightningWallet, events *chainntnfs.ChainNotifier,
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dbNamespace walletdb.Namespace, state OpenChannelState) (*LightningChannel, error) {
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return &LightningChannel{
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wallet: wallet,
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channelEvents: events,
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channelNamespace: dbNamespace,
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channelState: state,
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}, nil
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}
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// AddHTLC...
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func (lc *LightningChannel) AddHTLC() {
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}
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// SettleHTLC...
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func (lc *LightningChannel) SettleHTLC() {
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}
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// OurBalance...
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func (lc *LightningChannel) OurBalance() btcutil.Amount {
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return 0
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}
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// TheirBalance...
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func (lc *LightningChannel) TheirBalance() btcutil.Amount {
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return 0
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}
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// CurrentCommitTx...
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func (lc *LightningChannel) CurrentCommitTx() *btcutil.Tx {
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return nil
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}
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// SignTheirCommitTx...
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func (lc *LightningChannel) SignTheirCommitTx(commitTx *btcutil.Tx) error {
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return nil
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}
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// AddTheirSig...
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func (lc *LightningChannel) AddTheirSig(sig []byte) error {
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return nil
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}
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// VerifyCommitmentUpdate...
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func (lc *LightningChannel) VerifyCommitmentUpdate() error {
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return nil
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}
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// createCommitTx...
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func createCommitTx(fundingOutput *wire.TxIn, ourKey, theirKey *btcec.PublicKey,
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revokeHash [32]byte, csvTimeout int64, amtToUs,
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amtToThem btcutil.Amount) (*wire.MsgTx, error) {
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// First, we create the script paying to us. This script is spendable
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// under two conditions: either the 'csvTimeout' has passed and we can
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// redeem our funds, or they have the pre-image to 'revokeHash'.
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scriptToUs := txscript.NewScriptBuilder()
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scriptToUs.AddOp(txscript.OP_HASH160)
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scriptToUs.AddData(revokeHash[:])
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scriptToUs.AddOp(txscript.OP_EQUAL)
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scriptToUs.AddOp(txscript.OP_IF)
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scriptToUs.AddData(theirKey.SerializeCompressed())
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scriptToUs.AddOp(txscript.OP_ELSE)
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scriptToUs.AddInt64(csvTimeout)
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scriptToUs.AddOp(txscript.OP_NOP3) // CSV
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scriptToUs.AddOp(txscript.OP_DROP)
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scriptToUs.AddData(ourKey.SerializeCompressed())
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scriptToUs.AddOp(txscript.OP_ENDIF)
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scriptToUs.AddOp(txscript.OP_CHECKSIG)
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// TODO(roasbeef): store
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ourRedeemScript, err := scriptToUs.Script()
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if err != nil {
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return nil, err
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}
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payToUsScriptHash, err := scriptHashPkScript(ourRedeemScript)
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if err != nil {
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return nil, err
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}
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// Next, we create the script paying to them. This is just a regular
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// P2PKH (wrapped in P2SH) with their key.
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scriptToThem := txscript.NewScriptBuilder()
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scriptToThem.AddOp(txscript.OP_DUP)
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scriptToThem.AddOp(txscript.OP_HASH160)
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scriptToThem.AddData(btcutil.Hash160(theirKey.SerializeCompressed()))
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scriptToThem.AddOp(txscript.OP_EQUALVERIFY)
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scriptToThem.AddOp(txscript.OP_CHECKSIG)
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theirRedeemScript, err := scriptToThem.Script()
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if err != nil {
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return nil, err
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}
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payToThemScriptHash, err := scriptHashPkScript(theirRedeemScript)
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if err != nil {
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return nil, err
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}
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// TODO(roasbeef): sort outputs?
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commitTx := wire.NewMsgTx()
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commitTx.AddTxIn(fundingOutput)
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commitTx.AddTxOut(wire.NewTxOut(int64(amtToUs), payToUsScriptHash))
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commitTx.AddTxOut(wire.NewTxOut(int64(amtToThem), payToThemScriptHash))
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// Sort the transaction according to the agreed upon cannonical
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// ordering. This lets us skip sending the entire transaction over,
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// instead we'll just send signatures.
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txsort.InPlaceSort(commitTx)
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return commitTx, nil
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}
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//TODO(j): Creates a CLTV-only funding Tx (reserve is *REQUIRED*)
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//This works for only CLTV soft-fork (no CSV/segwit soft-fork in yet)
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//
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//Commit funds to Funding Tx, will timeout after the fundingTimeLock and refund
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//back using CLTV. As there is no way to enforce HTLCs, we rely upon a reserve
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//and have each party's HTLCs in-transit be less than their Commitment reserve.
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//In the event that someone incorrectly broadcasts an old Commitment TX, then
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//the counterparty claims the full reserve. It may be possible for either party
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//to claim the HTLC(!!! But it's okay because the "honest" party is made whole
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//via the reserve). If it's two-funder there are two outputs and the
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//Commitments spends from both outputs in the Funding Tx. Two-funder requires
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//the ourKey/theirKey sig positions to be swapped (should be in 1 funding tx).
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//
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//Quick note before I forget: The revocation hash is used in CLTV-only for
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//single-funder (without an initial payment) *as part of an additional output
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//in the Commitment Tx for the reserve*. This is to establish a unidirectional
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//channel UNITL the recipient has sufficient funds. When the recipient has
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//sufficient funds, the revocation is exchanged and allows the recipient to
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//claim the full reserve as penalty if the incorrect Commitment is broadcast
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//(otherwise it's timelocked refunded back to the sender). From then on, there
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//is no additional output in Commitment Txes. [side caveat, first payment must
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//be above minimum UTXO output size in single-funder] For now, let's keep it
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//simple and assume dual funder (with both funding above reserve)
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func createCLTVFundingTx(fundingTimeLock int64, ourKey *btcec.PublicKey, theirKey *btcec.PublicKey) (*wire.MsgTx, error) {
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script := txscript.NewScriptBuilder()
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//See how many entries there are
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//2: it's a 2-of-2 multisig
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//anything else: assume it's a CLTV-timeout 1-sig only
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script.AddOp(txscript.OP_DEPTH)
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script.AddInt64(2)
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script.AddOp(txscript.OP_EQUAL)
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//If this is a 2-of-2 multisig, read the first sig
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script.AddOp(txscript.OP_IF)
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//Sig2 (not P2PKH, the pubkey is in the redeemScript)
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script.AddData(ourKey.SerializeCompressed())
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script.AddOp(txscript.OP_CHECKSIGVERIFY) //gotta be verify!
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//If this is timed out
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script.AddOp(txscript.OP_ELSE)
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script.AddInt64(fundingTimeLock)
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script.AddOp(txscript.OP_NOP2) //CLTV
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//Sig (not P2PKH, the pubkey is in the redeemScript)
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script.AddOp(txscript.OP_CHECKSIG)
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script.AddOp(txscript.OP_DROP)
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script.AddOp(txscript.OP_ENDIF)
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//Read the other sig if it's 2-of-2, only one if it's timed out
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script.AddData(theirKey.SerializeCompressed())
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script.AddOp(txscript.OP_CHECKSIG)
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fundingTx := wire.NewMsgTx()
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//TODO(j) Add the inputs/outputs
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return fundingTx, nil
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}
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