Revamp funding workflow to match p2p workflow
* Now more closely mirrors Joseph’s photos * 3 step dance: init, theirFunds, theirSigs -> complete * Currently missing any concept of reserve funds for CLTV * Many lingering TODO’s still, once addressed will move onto Commitment TX update, and HTLC workflow
This commit is contained in:
Olaoluwa Osuntokun
parent
ce8be70c74
commit
ca40a2d924
464
wallet/wallet.go
464
wallet/wallet.go
@ -1,16 +1,18 @@
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package wallet
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import (
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"encoding/hex"
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"errors"
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"fmt"
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"sync"
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"sync/atomic"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/btcjson"
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"github.com/btcsuite/btcd/chaincfg"
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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/btcutil/coinset"
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"github.com/btcsuite/btcutil/txsort"
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"github.com/btcsuite/btcwallet/waddrmgr"
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btcwallet "github.com/btcsuite/btcwallet/wallet"
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"github.com/btcsuite/btcwallet/walletdb"
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@ -21,46 +23,150 @@ var (
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lightningNamespaceKey = []byte("lightning")
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// Error types
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ErrInsufficientFunds = errors.New("not enough available outputs to create funding transaction")
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ErrInsufficientFunds = errors.New("not enough available outputs to " +
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"create funding transaction")
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// Which bitcoin network are we using?
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ActiveNetParams = &chaincfg.TestNet3Params
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)
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// FundingRequest...
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type FundingReserveRequest struct {
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type FundingType uint16
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const (
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//Use SIGHASH_NOINPUT, assumes CSV
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SIGHASH FundingType = iota
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//Use CSV without reserve
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CSV
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// Use CSV with reserve
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// Reserve is a permanent amount of funds locked and the capacity.
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CSV_RESERVE
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// CLTV with reserve.
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CLTV_RESERVE
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)
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// partialFundingState...
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type partialFundingState struct {
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fundingType FundingType
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fundingAmount btcutil.Amount
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reserveAmount btcutil.Amount
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minFeePerKb btcutil.Amount
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theirInputs []*wire.TxIn
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ourInputs []*wire.TxIn
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theirChange []*wire.TxOut
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ourChange []*wire.TxOut
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ourKey *btcec.PrivateKey
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theirKey *btcec.PublicKey
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theirSigs [][]byte
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ourSigs [][]byte
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normalizedTxID wire.ShaHash
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fundingTx *wire.MsgTx
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// TODO(roasbef): time locks, who pays fee etc.
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// TODO(roasbeef): record Bob's ln-ID?
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}
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// newPartialFundingState...
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func newPartialFundingState(t FundingType, fundingAmt btcutil.Amount, minFeeRate btcutil.Amount) *partialFundingState {
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return &partialFundingState{
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fundingType: t,
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fundingAmount: fundingAmt,
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minFeePerKb: minFeeRate,
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}
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}
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// completedFundingState...
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type completedFundingState struct {
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partialFundingState
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regularTxID wire.ShaHash
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}
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// initFundingReserveReq...
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type initFundingReserveMsg struct {
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fundingAmount btcutil.Amount
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fundingType FundingType
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minFeeRate btcutil.Amount
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// TODO(roasbeef): optional reserve for CLTV, etc.
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// Insuffcient funds etc..
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err chan error // Buffered
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resp chan *FundingReserveResponse // Buffered
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resp chan *FundingReservation // Buffered
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}
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// FundingResponse...
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type FundingReserveResponse struct {
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fundingInputs []*wire.TxIn
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changeOutputs []*wire.TxOut
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type FundingReservation struct {
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FundingInputs []*wire.TxIn
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ChangeOutputs []*wire.TxOut
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FundingAmount btcutil.Amount
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// To be used in the 2-of-2 output.
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OurKey *btcec.PrivateKey
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ReservationID uint64
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}
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// FundingReserveCancelMsg...
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type FundingReserveCancelMsg struct {
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reserveToCancel *FundingReserveResponse
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type fundingReserveCancelMsg struct {
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pendingFundingID uint64
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// Buffered, used for optionally synchronization.
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err chan error // Buffered
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done chan struct{} // Buffered
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}
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// FundingReserveRequest...
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type FundingCompleteRequest struct {
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fundingReservation *FundingReserveResponse
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// addCounterPartySigsMsg...
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type addCounterPartyFundsMsg struct {
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pendingFundingID uint64
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theirInputs []*wire.TxIn // Includes sig-script to redeem.
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// TODO(roasbeef): Should also carry SPV proofs in we're in SPV mode
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theirInputs []*wire.TxIn
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theirChangeOutputs []*wire.TxOut
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theirKey *btcec.PublicKey
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err chan error // Buffered
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resp chan FundingCompleteResponse // Buffered
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resp chan *PartiallySignedFundingState // Buffered
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}
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// FundingCompleteResponse....
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type FundingCompleteResponse struct {
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fundingTx *btcutil.Tx
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type PartiallySignedFundingState struct {
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ReservationID uint64
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// In order of sorted inputs that are ours. Sorting is done in accordance
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// to BIP-69: https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki.
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OurSigs [][]byte
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NormalizedTxID wire.ShaHash
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}
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// addCounterPartySigsMsg...
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type addCounterPartySigsMsg struct {
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pendingFundingID uint64
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// Should be order of sorted inputs that are theirs. Sorting is done in accordance
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// to BIP-69: https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki.
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theirSigs [][]byte
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err chan error // Buffered
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resp chan *FinalizedFundingState // Buffered
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}
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// FundingCompleteResp...
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type FinalizedFundingState struct {
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FundingTxId wire.ShaHash
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NormalizedFundingTXID wire.ShaHash
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CompletedFundingTx *btcutil.Tx
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}
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// LightningWallet....
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@ -134,10 +240,14 @@ out:
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select {
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case m := <-l.msgChan:
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switch msg := m.(type) {
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case *FundingReserveRequest:
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case *initFundingReserveMsg:
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l.handleFundingReserveRequest(msg)
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case *FundingReserveCancelMsg:
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case *fundingReserveCancelMsg:
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l.handleFundingCancelRequest(msg)
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case *addCounterPartyFundsMsg:
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l.handleFundingCounterPartyFunds(msg)
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case *addCounterPartySigsMsg:
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l.handleFundingCounterPartySigs(msg)
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}
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case <-l.quit:
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// TODO: do some clean up
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@ -148,9 +258,30 @@ out:
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l.wg.Done()
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}
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// RequestFundingReservation...
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func (l *LightningWallet) RequestFundingReservation(a btcutil.Amount, t FundingType) (*FundingReservation, error) {
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errChan := make(chan error, 1)
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respChan := make(chan *FundingReservation, 1)
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l.msgChan <- &initFundingReserveMsg{
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fundingAmount: a,
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fundingType: t,
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err: errChan,
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resp: respChan,
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}
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return <-respChan, <-errChan
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}
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// handleFundingReserveRequest...
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func (l *LightningWallet) handleFundingReserveRequest(req *FundingReserveRequest) {
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fundingAmt := req.fundingAmount
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func (l *LightningWallet) handleFundingReserveRequest(req *initFundingReserveMsg) {
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// Create a limbo and record entry for this newly pending funding request.
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partialState := newPartialFundingState(req.fundingType, req.fundingAmount, req.minFeeRate)
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l.limboMtx.Lock()
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id := l.nextFundingID
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l.nextFundingID++
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l.fundingLimbo[id] = partialState
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l.limboMtx.Unlock()
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// Find all unlocked unspent outputs with greater than 6 confirmations.
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maxConfs := ^int32(0)
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@ -180,12 +311,12 @@ func (l *LightningWallet) handleFundingReserveRequest(req *FundingReserveRequest
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MaxInputs: 10,
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MinChangeAmount: 10000,
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}
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selectedCoins, err := selector.CoinSelect(fundingAmt, coins)
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selectedCoins, err := selector.CoinSelect(req.fundingAmount, coins)
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// Lock the selected coins. These coins are now "reserved", this
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// prevents concurrent funding requests from referring to and this
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// double-spending the same set of coins.
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fundingInputs := make([]*wire.TxIn, len(selectedCoins.Coins()))
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partialState.ourInputs = make([]*wire.TxIn, len(selectedCoins.Coins()))
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for i, coin := range selectedCoins.Coins() {
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txout := wire.NewOutPoint(coin.Hash(), coin.Index())
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l.LockOutpoint(*txout)
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@ -193,70 +324,285 @@ func (l *LightningWallet) handleFundingReserveRequest(req *FundingReserveRequest
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// Empty sig script, we'll actually sign if this reservation is
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// queued up to be completed (the other side accepts).
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outPoint := wire.NewOutPoint(coin.Hash(), coin.Index())
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fundingInputs[i] = wire.NewTxIn(outPoint, nil)
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partialState.ourInputs[i] = wire.NewTxIn(outPoint, nil)
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}
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// Create some possibly neccessary change outputs.
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selectedTotalValue := coinset.NewCoinSet(coins).TotalValue()
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changeOutputs := make([]*wire.TxOut, 0, len(selectedCoins.Coins()))
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if selectedTotalValue > fundingAmt {
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partialState.ourChange = make([]*wire.TxOut, 0, len(selectedCoins.Coins()))
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if selectedTotalValue > req.fundingAmount {
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// Change is necessary. Query for an available change address to
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// send the remainder to.
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changeAmount := selectedTotalValue - fundingAmt
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changeAmount := selectedTotalValue - req.fundingAmount
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changeAddr, err := l.NewChangeAddress(waddrmgr.DefaultAccountNum)
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if err != nil {
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req.err <- err
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req.resp <- nil
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return
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}
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changeOutputs = append(changeOutputs,
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partialState.ourChange = append(partialState.ourChange,
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wire.NewTxOut(int64(changeAmount), changeAddr.ScriptAddress()))
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}
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// TODO(roasbeef): re-calculate fees here to minFeePerKB
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multiSigKey, err := l.keyPool.getNextMultiSigKey()
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if err != nil {
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req.err <- err
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req.resp <- nil
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return
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}
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// Funding reservation request succesfully handled. The funding inputs
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// will be marked as unavailable until the reservation is either
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// completed, or cancecled.
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req.err <- nil
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req.resp <- &FundingReserveResponse{
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fundingInputs: fundingInputs,
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changeOutputs: changeOutputs,
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req.resp <- &FundingReservation{
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FundingInputs: partialState.ourInputs,
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ChangeOutputs: partialState.ourChange,
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FundingAmount: partialState.fundingAmount,
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OurKey: multiSigKey,
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}
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}
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// lnCoin...
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// to adhere to the coinset.Coin interface
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type lnCoin struct {
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hash *wire.ShaHash
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index uint32
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value btcutil.Amount
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pkScript []byte
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numConfs int64
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valueAge int64
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}
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}
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if err != nil {
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}
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if err != nil {
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}
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// RequestFundingReserveCancellation...
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func (l *LightningWallet) CancelFundingReservation(reservationID uint64) {
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doneChan := make(chan struct{}, 1)
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l.msgChan <- &fundingReserveCancelMsg{
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pendingFundingID: reservationID,
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done: doneChan,
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}
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<-doneChan
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}
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// handleFundingReserveCancel...
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func (l *LightningWallet) handleFundingCancelRequest(req *FundingReserveCancelMsg) {
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prevReservation := req.reserveToCancel
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func (l *LightningWallet) handleFundingCancelRequest(req *fundingReserveCancelMsg) {
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// TODO(roasbeef): holding lock too long
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l.limboMtx.Lock()
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defer l.limboMtx.Unlock()
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for _, unusedInput := range prevReservation.fundingInputs {
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pendingReservation, ok := l.fundingLimbo[req.pendingFundingID]
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if !ok {
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// TODO(roasbeef): make new error, "unkown funding state" or something
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req.err <- fmt.Errorf("attempted to cancel non-existant funding state")
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req.done <- struct{}{}
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return
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}
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// Mark all previously locked outpoints as usuable for future funding
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// requests.
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for _, unusedInput := range pendingReservation.ourInputs {
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l.UnlockOutpoint(unusedInput.PreviousOutPoint)
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}
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// Return the unused multi-sig key back to the pool.
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l.keyPool.releaseMultiSigKey(pendingReservation.ourKey)
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// TODO(roasbeef): Is it possible to mark the unused change also as
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// available?
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delete(l.fundingLimbo, req.pendingFundingID)
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req.err <- nil
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req.done <- struct{}{}
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}
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// AddCounterPartyFunds...
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func (l *LightningWallet) AddCounterPartyFundsForReservation(
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reservationId uint64,
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theirInputs []*wire.TxIn,
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theirChangeOutputs []*wire.TxOut,
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multiSigKey *btcec.PublicKey) (*FinalizedFundingState, error) {
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errChan := make(chan error, 1)
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respChan := make(chan *FinalizedFundingState, 1)
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l.msgChan <- &addCounterPartyFundsMsg{
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pendingFundingID: reservationId,
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theirInputs: theirInputs,
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theirChangeOutputs: theirChangeOutputs,
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theirKey: multiSigKey,
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}
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return <-respChan, <-errChan
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}
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// handleFundingCounterPartyFunds...
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func (l *LightningWallet) handleFundingCounterPartyFunds(req *addCounterPartyFundsMsg) {
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l.RLock()
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pendingReservation, ok := l.fundingLimbo[req.pendingFundingID]
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l.RUnlock()
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if !ok {
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req.err <- fmt.Errorf("attempted to update non-existant funding state")
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return
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}
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// Create a blank, fresh transaction. Soon to be a complete funding
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// transaction which will allow opening a lightning channel.
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pendingReservation.fundingTx = wire.NewMsgTx()
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// First, add all multi-party inputs to the transaction
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// TODO(roasbeef); handle case that tx doesn't exist, fake input
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// TODO(roasbeef): validate SPV proof from other side if in SPV mode.
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for _, ourInput := range pendingReservation.ourInputs {
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pendingReservation.fundingTx.AddTxIn(ourInput)
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}
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pendingReservation.theirInputs = req.theirInputs
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for _, theirInput := range pendingReservation.theirInputs {
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pendingReservation.fundingTx.AddTxIn(theirInput)
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}
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// Next, add all multi-party outputs to the transaction. This includes
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// change outputs for both side.
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for _, ourChangeOutput := range pendingReservation.ourChange {
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pendingReservation.fundingTx.AddTxOut(ourChangeOutput)
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}
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pendingReservation.theirChange = req.theirChangeOutputs
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for _, theirChangeOutput := range pendingReservation.theirChange {
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pendingReservation.fundingTx.AddTxOut(theirChangeOutput)
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}
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// Finally, add the 2-of-2 multi-sig output which will set up the lightning
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// channel. TODO(roasbeef): Cannonical sorting of keys here?
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keys := make([]*btcutil.AddressPubKey, 2)
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ourKey := pendingReservation.ourKey.PubKey().SerializeCompressed()
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keys[0], _ = btcutil.NewAddressPubKey(ourKey, ActiveNetParams)
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pendingReservation.theirKey = req.theirKey
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keys[1], _ = btcutil.NewAddressPubKey(pendingReservation.theirKey.SerializeCompressed(), ActiveNetParams)
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multiSigScript, err := txscript.MultiSigScript(keys, 2)
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if err != nil {
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req.err <- err
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req.resp <- nil
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return
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}
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multiSigOut := wire.NewTxOut(int64(pendingReservation.fundingAmount),
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multiSigScript)
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pendingReservation.fundingTx.AddTxOut(multiSigOut)
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// Sort the transaction. Since both side agree to a cannonical
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// ordering, by sorting we no longer need to send the entire
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// transaction. Only signatures will be exchanged.
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txsort.InPlaceSort(pendingReservation.fundingTx)
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// Now that the transaction has been cannonically sorted, compute the
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// normalized transation ID before we attach our signatures.
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pendingReservation.normalizedTxID = pendingReservation.fundingTx.TxSha()
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// Now, sign all inputs that are ours, collecting the signatures in
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// order of the inputs.
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pendingReservation.ourSigs = make([][]byte, len(pendingReservation.ourInputs))
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for i, txIn := range pendingReservation.fundingTx.TxIn {
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// Does the wallet know about the txin?
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txDetail, _ := l.TxStore.TxDetails(&txIn.PreviousOutPoint.Hash)
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if txDetail == nil {
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continue
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}
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// Is this our txin? TODO(roasbeef): assumes all inputs are P2PKH...
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prevIndex := txIn.PreviousOutPoint.Index
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prevOut := txDetail.TxRecord.MsgTx.TxOut[prevIndex]
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_, addrs, _, _ := txscript.ExtractPkScriptAddrs(prevOut.PkScript, ActiveNetParams)
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apkh, ok := addrs[0].(*btcutil.AddressPubKeyHash)
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if !ok {
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req.err <- btcwallet.ErrUnsupportedTransactionType
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req.resp <- nil
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return
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}
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ai, err := l.Manager.Address(apkh)
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if err != nil {
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req.err <- fmt.Errorf("cannot get address info: %v", err)
|
||||
req.resp <- nil
|
||||
return
|
||||
}
|
||||
pka := ai.(waddrmgr.ManagedPubKeyAddress)
|
||||
privkey, err := pka.PrivKey()
|
||||
if err != nil {
|
||||
req.err <- fmt.Errorf("cannot get private key: %v", err)
|
||||
req.resp <- nil
|
||||
return
|
||||
}
|
||||
|
||||
sigscript, err := txscript.SignatureScript(pendingReservation.fundingTx, i,
|
||||
prevOut.PkScript, txscript.SigHashAll, privkey,
|
||||
ai.Compressed())
|
||||
if err != nil {
|
||||
req.err <- fmt.Errorf("cannot create sigscript: %s", err)
|
||||
req.resp <- nil
|
||||
return
|
||||
}
|
||||
|
||||
pendingReservation.fundingTx.TxIn[i].SignatureScript = sigscript
|
||||
pendingReservation.ourSigs[i] = sigscript
|
||||
}
|
||||
|
||||
// Import the key we're using for the 2-of-2 multi-sig into the wallet,
|
||||
// so we can sign to spend from the funding tx later.
|
||||
// TODO(roasbeef): remove this after drawing pool key from HD.
|
||||
wif, _ := btcutil.NewWIF(pendingReservation.ourKey, ActiveNetParams, true)
|
||||
if _, err := l.ImportPrivateKey(wif, nil, false); err != nil {
|
||||
req.err <- err
|
||||
req.resp <- nil
|
||||
return
|
||||
}
|
||||
|
||||
req.err <- nil
|
||||
req.resp <- &PartiallySignedFundingState{
|
||||
OurSigs: pendingReservation.ourSigs,
|
||||
NormalizedTxID: pendingReservation.normalizedTxID,
|
||||
}
|
||||
}
|
||||
|
||||
// CompleteFundingReservation...
|
||||
func (l *LightningWallet) CompleteFundingReservation(reservationID uint64, theirSigs [][]byte) (*FinalizedFundingState, error) {
|
||||
errChan := make(chan error, 1)
|
||||
respChan := make(chan *FinalizedFundingState, 1)
|
||||
|
||||
l.msgChan <- &addCounterPartySigsMsg{
|
||||
pendingFundingID: reservationID,
|
||||
theirSigs: theirSigs,
|
||||
err: errChan,
|
||||
resp: respChan,
|
||||
}
|
||||
|
||||
return <-respChan, <-errChan
|
||||
}
|
||||
|
||||
// handleFundingCounterPartySigs...
|
||||
func (l *LightningWallet) handleFundingCounterPartySigs(msg *addCounterPartySigsMsg) {
|
||||
l.RLock()
|
||||
pendingReservation, ok := l.fundingLimbo[msg.pendingFundingID]
|
||||
l.RUnlock()
|
||||
if !ok {
|
||||
msg.err <- fmt.Errorf("attempted to update non-existant funding state")
|
||||
msg.resp <- nil
|
||||
return
|
||||
}
|
||||
|
||||
// Now we can complete the funding transaction by adding their
|
||||
// signatures to their inputs.
|
||||
i := 0
|
||||
pendingReservation.theirSigs = msg.theirSigs
|
||||
for _, txin := range pendingReservation.fundingTx.TxIn {
|
||||
if txin.SignatureScript == nil {
|
||||
// TODO(roasbeef): use txscript.Engine to make sure each sig is
|
||||
// valid, txn complete.
|
||||
txin.SignatureScript = pendingReservation.theirSigs[i]
|
||||
i++
|
||||
}
|
||||
}
|
||||
|
||||
// Now that all signatures are in place and valid record the regular txid
|
||||
finalTxID := pendingReservation.fundingTx.TxSha()
|
||||
|
||||
msg.err <- nil
|
||||
msg.resp <- &FinalizedFundingState{
|
||||
FundingTxId: finalTxID,
|
||||
NormalizedFundingTXID: pendingReservation.normalizedTxID,
|
||||
CompletedFundingTx: btcutil.NewTx(pendingReservation.fundingTx),
|
||||
}
|
||||
|
||||
// TODO(roasbeef): write the funding transaction to disk, delete from pending
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user