lnd.xprv/lnwallet/test_utils.go
Olaoluwa Osuntokun 0b62126067
multi: update funding workflow to be aware of new tweakless commits
In this commit, we update the funding workflow to be aware of the new
channel type that doesn't tweak the remote party's output within the
non-delay script on their commitment transaction. To do this, we now
allow the caller of `InnitChannelReservation` to signal if they want the
old or new (tweakless) commitment style.

The funding tests are also updated to test both funding variants, as
we'll still need to understand the legacy format for older nodes.
2019-09-25 18:25:46 -07:00

498 lines
14 KiB
Go

package lnwallet
import (
"bytes"
"crypto/rand"
"encoding/binary"
"encoding/hex"
"io"
"io/ioutil"
prand "math/rand"
"net"
"os"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/input"
"github.com/lightningnetwork/lnd/keychain"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/shachain"
)
var (
// For simplicity a single priv key controls all of our test outputs.
testWalletPrivKey = []byte{
0x2b, 0xd8, 0x06, 0xc9, 0x7f, 0x0e, 0x00, 0xaf,
0x1a, 0x1f, 0xc3, 0x32, 0x8f, 0xa7, 0x63, 0xa9,
0x26, 0x97, 0x23, 0xc8, 0xdb, 0x8f, 0xac, 0x4f,
0x93, 0xaf, 0x71, 0xdb, 0x18, 0x6d, 0x6e, 0x90,
}
// We're alice :)
bobsPrivKey = []byte{
0x81, 0xb6, 0x37, 0xd8, 0xfc, 0xd2, 0xc6, 0xda,
0x63, 0x59, 0xe6, 0x96, 0x31, 0x13, 0xa1, 0x17,
0xd, 0xe7, 0x95, 0xe4, 0xb7, 0x25, 0xb8, 0x4d,
0x1e, 0xb, 0x4c, 0xfd, 0x9e, 0xc5, 0x8c, 0xe9,
}
// Use a hard-coded HD seed.
testHdSeed = chainhash.Hash{
0xb7, 0x94, 0x38, 0x5f, 0x2d, 0x1e, 0xf7, 0xab,
0x4d, 0x92, 0x73, 0xd1, 0x90, 0x63, 0x81, 0xb4,
0x4f, 0x2f, 0x6f, 0x25, 0x88, 0xa3, 0xef, 0xb9,
0x6a, 0x49, 0x18, 0x83, 0x31, 0x98, 0x47, 0x53,
}
// A serializable txn for testing funding txn.
testTx = &wire.MsgTx{
Version: 1,
TxIn: []*wire.TxIn{
{
PreviousOutPoint: wire.OutPoint{
Hash: chainhash.Hash{},
Index: 0xffffffff,
},
SignatureScript: []byte{0x04, 0x31, 0xdc, 0x00, 0x1b, 0x01, 0x62},
Sequence: 0xffffffff,
},
},
TxOut: []*wire.TxOut{
{
Value: 5000000000,
PkScript: []byte{
0x41, // OP_DATA_65
0x04, 0xd6, 0x4b, 0xdf, 0xd0, 0x9e, 0xb1, 0xc5,
0xfe, 0x29, 0x5a, 0xbd, 0xeb, 0x1d, 0xca, 0x42,
0x81, 0xbe, 0x98, 0x8e, 0x2d, 0xa0, 0xb6, 0xc1,
0xc6, 0xa5, 0x9d, 0xc2, 0x26, 0xc2, 0x86, 0x24,
0xe1, 0x81, 0x75, 0xe8, 0x51, 0xc9, 0x6b, 0x97,
0x3d, 0x81, 0xb0, 0x1c, 0xc3, 0x1f, 0x04, 0x78,
0x34, 0xbc, 0x06, 0xd6, 0xd6, 0xed, 0xf6, 0x20,
0xd1, 0x84, 0x24, 0x1a, 0x6a, 0xed, 0x8b, 0x63,
0xa6, // 65-byte signature
0xac, // OP_CHECKSIG
},
},
},
LockTime: 5,
}
)
// CreateTestChannels creates to fully populated channels to be used within
// testing fixtures. The channels will be returned as if the funding process
// has just completed. The channel itself is funded with 10 BTC, with 5 BTC
// allocated to each side. Within the channel, Alice is the initiator. The
// function also returns a "cleanup" function that is meant to be called once
// the test has been finalized. The clean up function will remote all temporary
// files created. If tweaklessCommits is true, then the commits within the
// channels will use the new format, otherwise the legacy format.
func CreateTestChannels(tweaklessCommits bool) (
*LightningChannel, *LightningChannel, func(), error) {
channelCapacity, err := btcutil.NewAmount(10)
if err != nil {
return nil, nil, nil, err
}
channelBal := channelCapacity / 2
aliceDustLimit := btcutil.Amount(200)
bobDustLimit := btcutil.Amount(1300)
csvTimeoutAlice := uint32(5)
csvTimeoutBob := uint32(4)
prevOut := &wire.OutPoint{
Hash: chainhash.Hash(testHdSeed),
Index: prand.Uint32(),
}
fundingTxIn := wire.NewTxIn(prevOut, nil, nil)
// For each party, we'll create a distinct set of keys in order to
// emulate the typical set up with live channels.
var (
aliceKeys []*btcec.PrivateKey
bobKeys []*btcec.PrivateKey
)
for i := 0; i < 5; i++ {
key := make([]byte, len(testWalletPrivKey))
copy(key[:], testWalletPrivKey[:])
key[0] ^= byte(i + 1)
aliceKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), key)
aliceKeys = append(aliceKeys, aliceKey)
key = make([]byte, len(bobsPrivKey))
copy(key[:], bobsPrivKey)
key[0] ^= byte(i + 1)
bobKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), key)
bobKeys = append(bobKeys, bobKey)
}
aliceCfg := channeldb.ChannelConfig{
ChannelConstraints: channeldb.ChannelConstraints{
DustLimit: aliceDustLimit,
MaxPendingAmount: lnwire.NewMSatFromSatoshis(channelCapacity),
ChanReserve: channelCapacity / 100,
MinHTLC: 0,
MaxAcceptedHtlcs: input.MaxHTLCNumber / 2,
CsvDelay: uint16(csvTimeoutAlice),
},
MultiSigKey: keychain.KeyDescriptor{
PubKey: aliceKeys[0].PubKey(),
},
RevocationBasePoint: keychain.KeyDescriptor{
PubKey: aliceKeys[1].PubKey(),
},
PaymentBasePoint: keychain.KeyDescriptor{
PubKey: aliceKeys[2].PubKey(),
},
DelayBasePoint: keychain.KeyDescriptor{
PubKey: aliceKeys[3].PubKey(),
},
HtlcBasePoint: keychain.KeyDescriptor{
PubKey: aliceKeys[4].PubKey(),
},
}
bobCfg := channeldb.ChannelConfig{
ChannelConstraints: channeldb.ChannelConstraints{
DustLimit: bobDustLimit,
MaxPendingAmount: lnwire.NewMSatFromSatoshis(channelCapacity),
ChanReserve: channelCapacity / 100,
MinHTLC: 0,
MaxAcceptedHtlcs: input.MaxHTLCNumber / 2,
CsvDelay: uint16(csvTimeoutBob),
},
MultiSigKey: keychain.KeyDescriptor{
PubKey: bobKeys[0].PubKey(),
},
RevocationBasePoint: keychain.KeyDescriptor{
PubKey: bobKeys[1].PubKey(),
},
PaymentBasePoint: keychain.KeyDescriptor{
PubKey: bobKeys[2].PubKey(),
},
DelayBasePoint: keychain.KeyDescriptor{
PubKey: bobKeys[3].PubKey(),
},
HtlcBasePoint: keychain.KeyDescriptor{
PubKey: bobKeys[4].PubKey(),
},
}
bobRoot, err := chainhash.NewHash(bobKeys[0].Serialize())
if err != nil {
return nil, nil, nil, err
}
bobPreimageProducer := shachain.NewRevocationProducer(*bobRoot)
bobFirstRevoke, err := bobPreimageProducer.AtIndex(0)
if err != nil {
return nil, nil, nil, err
}
bobCommitPoint := input.ComputeCommitmentPoint(bobFirstRevoke[:])
aliceRoot, err := chainhash.NewHash(aliceKeys[0].Serialize())
if err != nil {
return nil, nil, nil, err
}
alicePreimageProducer := shachain.NewRevocationProducer(*aliceRoot)
aliceFirstRevoke, err := alicePreimageProducer.AtIndex(0)
if err != nil {
return nil, nil, nil, err
}
aliceCommitPoint := input.ComputeCommitmentPoint(aliceFirstRevoke[:])
aliceCommitTx, bobCommitTx, err := CreateCommitmentTxns(
channelBal, channelBal, &aliceCfg, &bobCfg, aliceCommitPoint,
bobCommitPoint, *fundingTxIn, tweaklessCommits,
)
if err != nil {
return nil, nil, nil, err
}
alicePath, err := ioutil.TempDir("", "alicedb")
if err != nil {
return nil, nil, nil, err
}
dbAlice, err := channeldb.Open(alicePath)
if err != nil {
return nil, nil, nil, err
}
bobPath, err := ioutil.TempDir("", "bobdb")
if err != nil {
return nil, nil, nil, err
}
dbBob, err := channeldb.Open(bobPath)
if err != nil {
return nil, nil, nil, err
}
estimator := NewStaticFeeEstimator(6000, 0)
feePerKw, err := estimator.EstimateFeePerKW(1)
if err != nil {
return nil, nil, nil, err
}
commitFee := calcStaticFee(0)
aliceCommit := channeldb.ChannelCommitment{
CommitHeight: 0,
LocalBalance: lnwire.NewMSatFromSatoshis(channelBal - commitFee),
RemoteBalance: lnwire.NewMSatFromSatoshis(channelBal),
CommitFee: commitFee,
FeePerKw: btcutil.Amount(feePerKw),
CommitTx: aliceCommitTx,
CommitSig: bytes.Repeat([]byte{1}, 71),
}
bobCommit := channeldb.ChannelCommitment{
CommitHeight: 0,
LocalBalance: lnwire.NewMSatFromSatoshis(channelBal),
RemoteBalance: lnwire.NewMSatFromSatoshis(channelBal - commitFee),
CommitFee: commitFee,
FeePerKw: btcutil.Amount(feePerKw),
CommitTx: bobCommitTx,
CommitSig: bytes.Repeat([]byte{1}, 71),
}
var chanIDBytes [8]byte
if _, err := io.ReadFull(rand.Reader, chanIDBytes[:]); err != nil {
return nil, nil, nil, err
}
shortChanID := lnwire.NewShortChanIDFromInt(
binary.BigEndian.Uint64(chanIDBytes[:]),
)
aliceChannelState := &channeldb.OpenChannel{
LocalChanCfg: aliceCfg,
RemoteChanCfg: bobCfg,
IdentityPub: aliceKeys[0].PubKey(),
FundingOutpoint: *prevOut,
ShortChannelID: shortChanID,
ChanType: channeldb.SingleFunderTweakless,
IsInitiator: true,
Capacity: channelCapacity,
RemoteCurrentRevocation: bobCommitPoint,
RevocationProducer: alicePreimageProducer,
RevocationStore: shachain.NewRevocationStore(),
LocalCommitment: aliceCommit,
RemoteCommitment: aliceCommit,
Db: dbAlice,
Packager: channeldb.NewChannelPackager(shortChanID),
FundingTxn: testTx,
}
bobChannelState := &channeldb.OpenChannel{
LocalChanCfg: bobCfg,
RemoteChanCfg: aliceCfg,
IdentityPub: bobKeys[0].PubKey(),
FundingOutpoint: *prevOut,
ShortChannelID: shortChanID,
ChanType: channeldb.SingleFunderTweakless,
IsInitiator: false,
Capacity: channelCapacity,
RemoteCurrentRevocation: aliceCommitPoint,
RevocationProducer: bobPreimageProducer,
RevocationStore: shachain.NewRevocationStore(),
LocalCommitment: bobCommit,
RemoteCommitment: bobCommit,
Db: dbBob,
Packager: channeldb.NewChannelPackager(shortChanID),
}
if !tweaklessCommits {
aliceChannelState.ChanType = channeldb.SingleFunder
bobChannelState.ChanType = channeldb.SingleFunder
}
aliceSigner := &input.MockSigner{Privkeys: aliceKeys}
bobSigner := &input.MockSigner{Privkeys: bobKeys}
// TODO(roasbeef): make mock version of pre-image store
alicePool := NewSigPool(1, aliceSigner)
channelAlice, err := NewLightningChannel(
aliceSigner, aliceChannelState, alicePool,
)
if err != nil {
return nil, nil, nil, err
}
alicePool.Start()
bobPool := NewSigPool(1, bobSigner)
channelBob, err := NewLightningChannel(
bobSigner, bobChannelState, bobPool,
)
if err != nil {
return nil, nil, nil, err
}
bobPool.Start()
err = SetStateNumHint(
aliceCommitTx, 0, channelAlice.stateHintObfuscator,
)
if err != nil {
return nil, nil, nil, err
}
err = SetStateNumHint(
bobCommitTx, 0, channelAlice.stateHintObfuscator,
)
if err != nil {
return nil, nil, nil, err
}
addr := &net.TCPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: 18556,
}
if err := channelAlice.channelState.SyncPending(addr, 101); err != nil {
return nil, nil, nil, err
}
addr = &net.TCPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: 18555,
}
if err := channelBob.channelState.SyncPending(addr, 101); err != nil {
return nil, nil, nil, err
}
cleanUpFunc := func() {
os.RemoveAll(bobPath)
os.RemoveAll(alicePath)
alicePool.Stop()
bobPool.Stop()
}
// Now that the channel are open, simulate the start of a session by
// having Alice and Bob extend their revocation windows to each other.
err = initRevocationWindows(channelAlice, channelBob)
if err != nil {
return nil, nil, nil, err
}
return channelAlice, channelBob, cleanUpFunc, nil
}
// initRevocationWindows simulates a new channel being opened within the p2p
// network by populating the initial revocation windows of the passed
// commitment state machines.
func initRevocationWindows(chanA, chanB *LightningChannel) error {
aliceNextRevoke, err := chanA.NextRevocationKey()
if err != nil {
return err
}
if err := chanB.InitNextRevocation(aliceNextRevoke); err != nil {
return err
}
bobNextRevoke, err := chanB.NextRevocationKey()
if err != nil {
return err
}
if err := chanA.InitNextRevocation(bobNextRevoke); err != nil {
return err
}
return nil
}
// pubkeyFromHex parses a Bitcoin public key from a hex encoded string.
func pubkeyFromHex(keyHex string) (*btcec.PublicKey, error) {
bytes, err := hex.DecodeString(keyHex)
if err != nil {
return nil, err
}
return btcec.ParsePubKey(bytes, btcec.S256())
}
// privkeyFromHex parses a Bitcoin private key from a hex encoded string.
func privkeyFromHex(keyHex string) (*btcec.PrivateKey, error) {
bytes, err := hex.DecodeString(keyHex)
if err != nil {
return nil, err
}
key, _ := btcec.PrivKeyFromBytes(btcec.S256(), bytes)
return key, nil
}
// blockFromHex parses a full Bitcoin block from a hex encoded string.
func blockFromHex(blockHex string) (*btcutil.Block, error) {
bytes, err := hex.DecodeString(blockHex)
if err != nil {
return nil, err
}
return btcutil.NewBlockFromBytes(bytes)
}
// txFromHex parses a full Bitcoin transaction from a hex encoded string.
func txFromHex(txHex string) (*btcutil.Tx, error) {
bytes, err := hex.DecodeString(txHex)
if err != nil {
return nil, err
}
return btcutil.NewTxFromBytes(bytes)
}
// calcStaticFee calculates appropriate fees for commitment transactions. This
// function provides a simple way to allow test balance assertions to take fee
// calculations into account.
//
// TODO(bvu): Refactor when dynamic fee estimation is added.
func calcStaticFee(numHTLCs int) btcutil.Amount {
const (
commitWeight = btcutil.Amount(724)
htlcWeight = 172
feePerKw = btcutil.Amount(24/4) * 1000
)
return feePerKw * (commitWeight +
btcutil.Amount(htlcWeight*numHTLCs)) / 1000
}
// ForceStateTransition executes the necessary interaction between the two
// commitment state machines to transition to a new state locking in any
// pending updates. This method is useful when testing interactions between two
// live state machines.
func ForceStateTransition(chanA, chanB *LightningChannel) error {
aliceSig, aliceHtlcSigs, _, err := chanA.SignNextCommitment()
if err != nil {
return err
}
if err = chanB.ReceiveNewCommitment(aliceSig, aliceHtlcSigs); err != nil {
return err
}
bobRevocation, _, err := chanB.RevokeCurrentCommitment()
if err != nil {
return err
}
bobSig, bobHtlcSigs, _, err := chanB.SignNextCommitment()
if err != nil {
return err
}
if _, _, _, _, err := chanA.ReceiveRevocation(bobRevocation); err != nil {
return err
}
if err := chanA.ReceiveNewCommitment(bobSig, bobHtlcSigs); err != nil {
return err
}
aliceRevocation, _, err := chanA.RevokeCurrentCommitment()
if err != nil {
return err
}
if _, _, _, _, err := chanB.ReceiveRevocation(aliceRevocation); err != nil {
return err
}
return nil
}