mirror of
https://github.com/lightningnetwork/lnd.git
synced 2024-11-19 18:10:34 +01:00
7dfe4018ce
This commit was previously split into the following parts to ease review: - 2d746f68: replace imports - 4008f0fd: use ecdsa.Signature - 849e33d1: remove btcec.S256() - b8f6ebbd: use v2 library correctly - fa80bca9: bump go modules
533 lines
13 KiB
Go
533 lines
13 KiB
Go
package chanfunding
|
|
|
|
import (
|
|
"encoding/hex"
|
|
"regexp"
|
|
"testing"
|
|
|
|
"github.com/btcsuite/btcd/btcutil"
|
|
"github.com/btcsuite/btcd/wire"
|
|
"github.com/lightningnetwork/lnd/input"
|
|
"github.com/lightningnetwork/lnd/lnwallet/chainfee"
|
|
"github.com/stretchr/testify/require"
|
|
)
|
|
|
|
var (
|
|
p2wkhScript, _ = hex.DecodeString(
|
|
"001411034bdcb6ccb7744fdfdeea958a6fb0b415a032",
|
|
)
|
|
|
|
np2wkhScript, _ = hex.DecodeString(
|
|
"a914f7bd5b8077b9549653dacf96f824af9d931663e687",
|
|
)
|
|
|
|
p2khScript, _ = hex.DecodeString(
|
|
"76a91411034bdcb6ccb7744fdfdeea958a6fb0b415a03288ac",
|
|
)
|
|
)
|
|
|
|
// fundingFee is a helper method that returns the fee estimate used for a tx
|
|
// with the given number of inputs and the optional change output. This matches
|
|
// the estimate done by the wallet.
|
|
func fundingFee(feeRate chainfee.SatPerKWeight, numInput int, // nolint:unparam
|
|
change bool) btcutil.Amount {
|
|
|
|
var weightEstimate input.TxWeightEstimator
|
|
|
|
// All inputs.
|
|
for i := 0; i < numInput; i++ {
|
|
weightEstimate.AddP2WKHInput()
|
|
}
|
|
|
|
// The multisig funding output.
|
|
weightEstimate.AddP2WSHOutput()
|
|
|
|
// Optionally count a change output.
|
|
if change {
|
|
weightEstimate.AddP2WKHOutput()
|
|
}
|
|
|
|
totalWeight := int64(weightEstimate.Weight())
|
|
return feeRate.FeeForWeight(totalWeight)
|
|
}
|
|
|
|
// TestCalculateFees tests that the helper function to calculate the fees
|
|
// both with and without applying a change output is done correctly for
|
|
// (N)P2WKH inputs, and should raise an error otherwise.
|
|
func TestCalculateFees(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
const feeRate = chainfee.SatPerKWeight(1000)
|
|
|
|
type testCase struct {
|
|
name string
|
|
utxos []Coin
|
|
|
|
expectedFeeNoChange btcutil.Amount
|
|
expectedFeeWithChange btcutil.Amount
|
|
expectedErr error
|
|
}
|
|
|
|
testCases := []testCase{
|
|
{
|
|
name: "one P2WKH input",
|
|
utxos: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: 1,
|
|
},
|
|
},
|
|
},
|
|
|
|
expectedFeeNoChange: 487,
|
|
expectedFeeWithChange: 611,
|
|
expectedErr: nil,
|
|
},
|
|
|
|
{
|
|
name: "one NP2WKH input",
|
|
utxos: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: np2wkhScript,
|
|
Value: 1,
|
|
},
|
|
},
|
|
},
|
|
|
|
expectedFeeNoChange: 579,
|
|
expectedFeeWithChange: 703,
|
|
expectedErr: nil,
|
|
},
|
|
|
|
{
|
|
name: "not supported P2KH input",
|
|
utxos: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2khScript,
|
|
Value: 1,
|
|
},
|
|
},
|
|
},
|
|
|
|
expectedErr: &errUnsupportedInput{p2khScript},
|
|
},
|
|
}
|
|
|
|
for _, test := range testCases {
|
|
test := test
|
|
t.Run(test.name, func(t *testing.T) {
|
|
feeNoChange, feeWithChange, err := calculateFees(
|
|
test.utxos, feeRate,
|
|
)
|
|
require.Equal(t, test.expectedErr, err)
|
|
|
|
// Note: The error-case will have zero values returned
|
|
// for fees and therefore anyway pass the following
|
|
// requirements.
|
|
require.Equal(t, test.expectedFeeNoChange, feeNoChange)
|
|
require.Equal(t, test.expectedFeeWithChange, feeWithChange)
|
|
})
|
|
}
|
|
}
|
|
|
|
// TestCoinSelect tests that we pick coins adding up to the expected amount
|
|
// when creating a funding transaction, and that the calculated change is the
|
|
// expected amount.
|
|
//
|
|
// NOTE: coinSelect will always attempt to add a change output, so we must
|
|
// account for this in the tests.
|
|
func TestCoinSelect(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
const feeRate = chainfee.SatPerKWeight(100)
|
|
const dustLimit = btcutil.Amount(1000)
|
|
|
|
type testCase struct {
|
|
name string
|
|
outputValue btcutil.Amount
|
|
coins []Coin
|
|
|
|
expectedInput []btcutil.Amount
|
|
expectedChange btcutil.Amount
|
|
expectErr bool
|
|
}
|
|
|
|
testCases := []testCase{
|
|
{
|
|
// We have 1.0 BTC available, and wants to send 0.5.
|
|
// This will obviously lead to a change output of
|
|
// almost 0.5 BTC.
|
|
name: "big change",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: 1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
},
|
|
},
|
|
outputValue: 0.5 * btcutil.SatoshiPerBitcoin,
|
|
|
|
// The one and only input will be selected.
|
|
expectedInput: []btcutil.Amount{
|
|
1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
// Change will be what's left minus the fee.
|
|
expectedChange: 0.5*btcutil.SatoshiPerBitcoin - fundingFee(feeRate, 1, true),
|
|
},
|
|
{
|
|
// We have 1 BTC available, and we want to send 1 BTC.
|
|
// This should lead to an error, as we don't have
|
|
// enough funds to pay the fee.
|
|
name: "nothing left for fees",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: 1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
},
|
|
},
|
|
outputValue: 1 * btcutil.SatoshiPerBitcoin,
|
|
expectErr: true,
|
|
},
|
|
{
|
|
// We have a 1 BTC input, and want to create an output
|
|
// as big as possible, such that the remaining change
|
|
// would be dust but instead goes to fees.
|
|
name: "dust change",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: 1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
},
|
|
},
|
|
// We tune the output value by subtracting the expected
|
|
// fee and the dustlimit.
|
|
outputValue: 1*btcutil.SatoshiPerBitcoin - fundingFee(feeRate, 1, false) - dustLimit,
|
|
|
|
expectedInput: []btcutil.Amount{
|
|
1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
|
|
// Change must be zero.
|
|
expectedChange: 0,
|
|
},
|
|
{
|
|
// We got just enough funds to create a change output above the
|
|
// dust limit.
|
|
name: "change right above dustlimit",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: int64(fundingFee(feeRate, 1, true) + 2*(dustLimit+1)),
|
|
},
|
|
},
|
|
},
|
|
// We tune the output value to be just above the dust limit.
|
|
outputValue: dustLimit + 1,
|
|
|
|
expectedInput: []btcutil.Amount{
|
|
fundingFee(feeRate, 1, true) + 2*(dustLimit+1),
|
|
},
|
|
|
|
// After paying for the fee the change output should be just above
|
|
// the dust limit.
|
|
expectedChange: dustLimit + 1,
|
|
},
|
|
{
|
|
// If more than 20% of funds goes to fees, it should fail.
|
|
name: "high fee",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: int64(5 * fundingFee(feeRate, 1, false)),
|
|
},
|
|
},
|
|
},
|
|
outputValue: 4 * fundingFee(feeRate, 1, false),
|
|
|
|
expectErr: true,
|
|
},
|
|
}
|
|
|
|
for _, test := range testCases {
|
|
test := test
|
|
t.Run(test.name, func(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
selected, changeAmt, err := CoinSelect(
|
|
feeRate, test.outputValue, dustLimit, test.coins,
|
|
)
|
|
if !test.expectErr && err != nil {
|
|
t.Fatalf(err.Error())
|
|
}
|
|
|
|
if test.expectErr && err == nil {
|
|
t.Fatalf("expected error")
|
|
}
|
|
|
|
// If we got an expected error, there is nothing more to test.
|
|
if test.expectErr {
|
|
return
|
|
}
|
|
|
|
// Check that the selected inputs match what we expect.
|
|
if len(selected) != len(test.expectedInput) {
|
|
t.Fatalf("expected %v inputs, got %v",
|
|
len(test.expectedInput), len(selected))
|
|
}
|
|
|
|
for i, coin := range selected {
|
|
if coin.Value != int64(test.expectedInput[i]) {
|
|
t.Fatalf("expected input %v to have value %v, "+
|
|
"had %v", i, test.expectedInput[i],
|
|
coin.Value)
|
|
}
|
|
}
|
|
|
|
// Assert we got the expected change amount.
|
|
if changeAmt != test.expectedChange {
|
|
t.Fatalf("expected %v change amt, got %v",
|
|
test.expectedChange, changeAmt)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
// TestCoinSelectSubtractFees tests that we pick coins adding up to the
|
|
// expected amount when creating a funding transaction, and that a change
|
|
// output is created only when necessary.
|
|
func TestCoinSelectSubtractFees(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
const feeRate = chainfee.SatPerKWeight(100)
|
|
const highFeeRate = chainfee.SatPerKWeight(1000)
|
|
const dustLimit = btcutil.Amount(1000)
|
|
const dust = btcutil.Amount(100)
|
|
|
|
// removeAmounts replaces any amounts in string with "<amt>".
|
|
removeAmounts := func(s string) string {
|
|
re := regexp.MustCompile(`[[:digit:]]+\.?[[:digit:]]*`)
|
|
return re.ReplaceAllString(s, "<amt>")
|
|
}
|
|
|
|
type testCase struct {
|
|
name string
|
|
highFee bool
|
|
spendValue btcutil.Amount
|
|
coins []Coin
|
|
|
|
expectedInput []btcutil.Amount
|
|
expectedFundingAmt btcutil.Amount
|
|
expectedChange btcutil.Amount
|
|
expectErr string
|
|
}
|
|
|
|
testCases := []testCase{
|
|
{
|
|
// We have 1.0 BTC available, spend them all. This
|
|
// should lead to a funding TX with one output, the
|
|
// rest goes to fees.
|
|
name: "spend all",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: 1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
},
|
|
},
|
|
spendValue: 1 * btcutil.SatoshiPerBitcoin,
|
|
|
|
// The one and only input will be selected.
|
|
expectedInput: []btcutil.Amount{
|
|
1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
expectedFundingAmt: 1*btcutil.SatoshiPerBitcoin - fundingFee(feeRate, 1, false),
|
|
expectedChange: 0,
|
|
},
|
|
{
|
|
// We have 1.0 BTC available and spend half of it. This
|
|
// should lead to a funding TX with a change output.
|
|
name: "spend with change",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: 1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
},
|
|
},
|
|
spendValue: 0.5 * btcutil.SatoshiPerBitcoin,
|
|
|
|
// The one and only input will be selected.
|
|
expectedInput: []btcutil.Amount{
|
|
1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
expectedFundingAmt: 0.5*btcutil.SatoshiPerBitcoin - fundingFee(feeRate, 1, true),
|
|
expectedChange: 0.5 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
{
|
|
// The total funds available is below the dust limit
|
|
// after paying fees.
|
|
name: "dust output",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: int64(fundingFee(feeRate, 1, false) + dustLimit - 1),
|
|
},
|
|
},
|
|
},
|
|
spendValue: fundingFee(feeRate, 1, false) + dust,
|
|
|
|
expectErr: "output amount(<amt> BTC) after subtracting " +
|
|
"fees(<amt> BTC) below dust limit(<amt> BTC)",
|
|
},
|
|
{
|
|
// After subtracting fees, the resulting change output
|
|
// is below the dust limit. The remainder should go
|
|
// towards the funding output.
|
|
name: "dust change",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: 1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
},
|
|
},
|
|
spendValue: 1*btcutil.SatoshiPerBitcoin - dust,
|
|
|
|
expectedInput: []btcutil.Amount{
|
|
1 * btcutil.SatoshiPerBitcoin,
|
|
},
|
|
expectedFundingAmt: 1*btcutil.SatoshiPerBitcoin - fundingFee(feeRate, 1, false),
|
|
expectedChange: 0,
|
|
},
|
|
{
|
|
// We got just enough funds to create an output above the dust limit.
|
|
name: "output right above dustlimit",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: int64(fundingFee(feeRate, 1, false) + dustLimit + 1),
|
|
},
|
|
},
|
|
},
|
|
spendValue: fundingFee(feeRate, 1, false) + dustLimit + 1,
|
|
|
|
expectedInput: []btcutil.Amount{
|
|
fundingFee(feeRate, 1, false) + dustLimit + 1,
|
|
},
|
|
expectedFundingAmt: dustLimit + 1,
|
|
expectedChange: 0,
|
|
},
|
|
{
|
|
// Amount left is below dust limit after paying fee for
|
|
// a change output, resulting in a no-change tx.
|
|
name: "no amount to pay fee for change",
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: int64(fundingFee(feeRate, 1, false) + 2*(dustLimit+1)),
|
|
},
|
|
},
|
|
},
|
|
spendValue: fundingFee(feeRate, 1, false) + dustLimit + 1,
|
|
|
|
expectedInput: []btcutil.Amount{
|
|
fundingFee(feeRate, 1, false) + 2*(dustLimit+1),
|
|
},
|
|
expectedFundingAmt: 2 * (dustLimit + 1),
|
|
expectedChange: 0,
|
|
},
|
|
{
|
|
// If more than 20% of funds goes to fees, it should fail.
|
|
name: "high fee",
|
|
highFee: true,
|
|
coins: []Coin{
|
|
{
|
|
TxOut: wire.TxOut{
|
|
PkScript: p2wkhScript,
|
|
Value: int64(5 * fundingFee(highFeeRate, 1, false)),
|
|
},
|
|
},
|
|
},
|
|
spendValue: 5 * fundingFee(highFeeRate, 1, false),
|
|
|
|
expectErr: "fee <amt> BTC on total output value <amt> BTC",
|
|
},
|
|
}
|
|
|
|
for _, test := range testCases {
|
|
test := test
|
|
|
|
t.Run(test.name, func(t *testing.T) {
|
|
feeRate := feeRate
|
|
if test.highFee {
|
|
feeRate = highFeeRate
|
|
}
|
|
|
|
selected, localFundingAmt, changeAmt, err := CoinSelectSubtractFees(
|
|
feeRate, test.spendValue, dustLimit, test.coins,
|
|
)
|
|
if err != nil {
|
|
switch {
|
|
case test.expectErr == "":
|
|
t.Fatalf(err.Error())
|
|
|
|
case test.expectErr != removeAmounts(err.Error()):
|
|
t.Fatalf("expected error '%v', got '%v'",
|
|
test.expectErr,
|
|
removeAmounts(err.Error()))
|
|
|
|
// If we got an expected error, there is
|
|
// nothing more to test.
|
|
default:
|
|
return
|
|
}
|
|
}
|
|
|
|
// Check that there was no expected error we missed.
|
|
if test.expectErr != "" {
|
|
t.Fatalf("expected error")
|
|
}
|
|
|
|
// Check that the selected inputs match what we expect.
|
|
if len(selected) != len(test.expectedInput) {
|
|
t.Fatalf("expected %v inputs, got %v",
|
|
len(test.expectedInput), len(selected))
|
|
}
|
|
|
|
for i, coin := range selected {
|
|
if coin.Value != int64(test.expectedInput[i]) {
|
|
t.Fatalf("expected input %v to have value %v, "+
|
|
"had %v", i, test.expectedInput[i],
|
|
coin.Value)
|
|
}
|
|
}
|
|
|
|
// Assert we got the expected change amount.
|
|
if localFundingAmt != test.expectedFundingAmt {
|
|
t.Fatalf("expected %v local funding amt, got %v",
|
|
test.expectedFundingAmt, localFundingAmt)
|
|
}
|
|
if changeAmt != test.expectedChange {
|
|
t.Fatalf("expected %v change amt, got %v",
|
|
test.expectedChange, changeAmt)
|
|
}
|
|
})
|
|
}
|
|
}
|