lnd.xprv/lnwallet/test_utils.go

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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"
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"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/input"
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"github.com/lightningnetwork/lnd/keychain"
"github.com/lightningnetwork/lnd/lnwallet/chainfee"
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"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 := chainfee.NewStaticEstimator(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.SingleFunderTweaklessBit,
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.SingleFunderTweaklessBit,
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.SingleFunderBit
bobChannelState.ChanType = channeldb.SingleFunderBit
}
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 {
multi: address lingering TODO by no longer wiping out local HTLCs on remote close In this commit, we fix a lingering TOOD statement in the channel arb. Before this commitment, we would simply wipe our our local HTLC set of the HTLC set that was on the remote commitment transaction on force close. This was incorrect as if our commitment transaction had an HTLC that the remote commitment didn't, then we would fail to cancel that back, and cause both channels to time out on chain. In order to remedy this, we introduce a new `HtlcSetKey` struct to track all 3 possible in-flight set of HTLCs: ours, theirs, and their pending. We also we start to tack on additional data to all the unilateral close messages we send to subscribers. This new data is the CommitSet, or the set of valid commitments at channel closure time. This new information will be used by the channel arb in an upcoming commit to ensure it will cancel back HTLCs in the case of split commitment state. Finally, we start to thread through an optional *CommitSet to the advanceState method. This additional information will give the channel arb addition information it needs to ensure it properly cancels back HTLCs that are about to time out or may time out depending on which commitment is played. Within the htlcswitch pakage, we modify the `SignNextCommitment` method to return the new set of pending HTLCs for the remote party's commitment transaction and `ReceiveRevocation` to return the latest set of commitment transactions on the remote party's commitment as well. This is a preparatory change which is part of a larger change to address a lingering TODO in the cnct. Additionally, rather than just send of the set of HTLCs after the we revoke, we'll also send of the set of HTLCs after the remote party revokes, and we create a pending commitment state for it.
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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
}
multi: address lingering TODO by no longer wiping out local HTLCs on remote close In this commit, we fix a lingering TOOD statement in the channel arb. Before this commitment, we would simply wipe our our local HTLC set of the HTLC set that was on the remote commitment transaction on force close. This was incorrect as if our commitment transaction had an HTLC that the remote commitment didn't, then we would fail to cancel that back, and cause both channels to time out on chain. In order to remedy this, we introduce a new `HtlcSetKey` struct to track all 3 possible in-flight set of HTLCs: ours, theirs, and their pending. We also we start to tack on additional data to all the unilateral close messages we send to subscribers. This new data is the CommitSet, or the set of valid commitments at channel closure time. This new information will be used by the channel arb in an upcoming commit to ensure it will cancel back HTLCs in the case of split commitment state. Finally, we start to thread through an optional *CommitSet to the advanceState method. This additional information will give the channel arb addition information it needs to ensure it properly cancels back HTLCs that are about to time out or may time out depending on which commitment is played. Within the htlcswitch pakage, we modify the `SignNextCommitment` method to return the new set of pending HTLCs for the remote party's commitment transaction and `ReceiveRevocation` to return the latest set of commitment transactions on the remote party's commitment as well. This is a preparatory change which is part of a larger change to address a lingering TODO in the cnct. Additionally, rather than just send of the set of HTLCs after the we revoke, we'll also send of the set of HTLCs after the remote party revokes, and we create a pending commitment state for it.
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bobSig, bobHtlcSigs, _, err := chanB.SignNextCommitment()
if err != nil {
return err
}
multi: address lingering TODO by no longer wiping out local HTLCs on remote close In this commit, we fix a lingering TOOD statement in the channel arb. Before this commitment, we would simply wipe our our local HTLC set of the HTLC set that was on the remote commitment transaction on force close. This was incorrect as if our commitment transaction had an HTLC that the remote commitment didn't, then we would fail to cancel that back, and cause both channels to time out on chain. In order to remedy this, we introduce a new `HtlcSetKey` struct to track all 3 possible in-flight set of HTLCs: ours, theirs, and their pending. We also we start to tack on additional data to all the unilateral close messages we send to subscribers. This new data is the CommitSet, or the set of valid commitments at channel closure time. This new information will be used by the channel arb in an upcoming commit to ensure it will cancel back HTLCs in the case of split commitment state. Finally, we start to thread through an optional *CommitSet to the advanceState method. This additional information will give the channel arb addition information it needs to ensure it properly cancels back HTLCs that are about to time out or may time out depending on which commitment is played. Within the htlcswitch pakage, we modify the `SignNextCommitment` method to return the new set of pending HTLCs for the remote party's commitment transaction and `ReceiveRevocation` to return the latest set of commitment transactions on the remote party's commitment as well. This is a preparatory change which is part of a larger change to address a lingering TODO in the cnct. Additionally, rather than just send of the set of HTLCs after the we revoke, we'll also send of the set of HTLCs after the remote party revokes, and we create a pending commitment state for it.
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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
}
multi: address lingering TODO by no longer wiping out local HTLCs on remote close In this commit, we fix a lingering TOOD statement in the channel arb. Before this commitment, we would simply wipe our our local HTLC set of the HTLC set that was on the remote commitment transaction on force close. This was incorrect as if our commitment transaction had an HTLC that the remote commitment didn't, then we would fail to cancel that back, and cause both channels to time out on chain. In order to remedy this, we introduce a new `HtlcSetKey` struct to track all 3 possible in-flight set of HTLCs: ours, theirs, and their pending. We also we start to tack on additional data to all the unilateral close messages we send to subscribers. This new data is the CommitSet, or the set of valid commitments at channel closure time. This new information will be used by the channel arb in an upcoming commit to ensure it will cancel back HTLCs in the case of split commitment state. Finally, we start to thread through an optional *CommitSet to the advanceState method. This additional information will give the channel arb addition information it needs to ensure it properly cancels back HTLCs that are about to time out or may time out depending on which commitment is played. Within the htlcswitch pakage, we modify the `SignNextCommitment` method to return the new set of pending HTLCs for the remote party's commitment transaction and `ReceiveRevocation` to return the latest set of commitment transactions on the remote party's commitment as well. This is a preparatory change which is part of a larger change to address a lingering TODO in the cnct. Additionally, rather than just send of the set of HTLCs after the we revoke, we'll also send of the set of HTLCs after the remote party revokes, and we create a pending commitment state for it.
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if _, _, _, _, err := chanB.ReceiveRevocation(aliceRevocation); err != nil {
return err
}
return nil
}