lnd.xprv/lntest/itest/lnd_onchain_test.go

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package itest
import (
"bytes"
"context"
"fmt"
"strings"
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"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
"github.com/lightningnetwork/lnd/lntest"
"github.com/lightningnetwork/lnd/lntest/wait"
"github.com/lightningnetwork/lnd/lnwallet"
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"github.com/lightningnetwork/lnd/sweep"
"github.com/stretchr/testify/require"
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)
// testCPFP ensures that the daemon can bump an unconfirmed transaction's fee
// rate by broadcasting a Child-Pays-For-Parent (CPFP) transaction.
//
// TODO(wilmer): Add RBF case once btcd supports it.
func testCPFP(net *lntest.NetworkHarness, t *harnessTest) {
// Skip this test for neutrino, as it's not aware of mempool
// transactions.
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if net.BackendCfg.Name() == lntest.NeutrinoBackendName {
t.Skipf("skipping CPFP test for neutrino backend")
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}
// We'll start the test by sending Alice some coins, which she'll use to
// send to Bob.
ctxb := context.Background()
ctxt, _ := context.WithTimeout(ctxb, defaultTimeout)
net.SendCoins(ctxt, t.t, btcutil.SatoshiPerBitcoin, net.Alice)
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// Create an address for Bob to send the coins to.
addrReq := &lnrpc.NewAddressRequest{
Type: lnrpc.AddressType_WITNESS_PUBKEY_HASH,
}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
resp, err := net.Bob.NewAddress(ctxt, addrReq)
if err != nil {
t.Fatalf("unable to get new address for bob: %v", err)
}
// Send the coins from Alice to Bob. We should expect a transaction to
// be broadcast and seen in the mempool.
sendReq := &lnrpc.SendCoinsRequest{
Addr: resp.Address,
Amount: btcutil.SatoshiPerBitcoin,
}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
if _, err = net.Alice.SendCoins(ctxt, sendReq); err != nil {
t.Fatalf("unable to send coins to bob: %v", err)
}
txid, err := waitForTxInMempool(net.Miner.Client, minerMempoolTimeout)
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if err != nil {
t.Fatalf("expected one mempool transaction: %v", err)
}
// We'll then extract the raw transaction from the mempool in order to
// determine the index of Bob's output.
tx, err := net.Miner.Client.GetRawTransaction(txid)
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if err != nil {
t.Fatalf("unable to extract raw transaction from mempool: %v",
err)
}
bobOutputIdx := -1
for i, txOut := range tx.MsgTx().TxOut {
_, addrs, _, err := txscript.ExtractPkScriptAddrs(
txOut.PkScript, net.Miner.ActiveNet,
)
if err != nil {
t.Fatalf("unable to extract address from pkScript=%x: "+
"%v", txOut.PkScript, err)
}
if addrs[0].String() == resp.Address {
bobOutputIdx = i
}
}
if bobOutputIdx == -1 {
t.Fatalf("bob's output was not found within the transaction")
}
// Wait until bob has seen the tx and considers it as owned.
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op := &lnrpc.OutPoint{
TxidBytes: txid[:],
OutputIndex: uint32(bobOutputIdx),
}
assertWalletUnspent(t, net.Bob, op)
// We'll attempt to bump the fee of this transaction by performing a
// CPFP from Alice's point of view.
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bumpFeeReq := &walletrpc.BumpFeeRequest{
Outpoint: op,
SatPerVbyte: uint64(
sweep.DefaultMaxFeeRate.FeePerKVByte() / 2000,
),
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}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
_, err = net.Bob.WalletKitClient.BumpFee(ctxt, bumpFeeReq)
if err != nil {
t.Fatalf("unable to bump fee: %v", err)
}
// We should now expect to see two transactions within the mempool, a
// parent and its child.
_, err = waitForNTxsInMempool(net.Miner.Client, 2, minerMempoolTimeout)
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if err != nil {
t.Fatalf("expected two mempool transactions: %v", err)
}
// We should also expect to see the output being swept by the
// UtxoSweeper. We'll ensure it's using the fee rate specified.
pendingSweepsReq := &walletrpc.PendingSweepsRequest{}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
pendingSweepsResp, err := net.Bob.WalletKitClient.PendingSweeps(
ctxt, pendingSweepsReq,
)
if err != nil {
t.Fatalf("unable to retrieve pending sweeps: %v", err)
}
if len(pendingSweepsResp.PendingSweeps) != 1 {
t.Fatalf("expected to find %v pending sweep(s), found %v", 1,
len(pendingSweepsResp.PendingSweeps))
}
pendingSweep := pendingSweepsResp.PendingSweeps[0]
if !bytes.Equal(pendingSweep.Outpoint.TxidBytes, op.TxidBytes) {
t.Fatalf("expected output txid %x, got %x", op.TxidBytes,
pendingSweep.Outpoint.TxidBytes)
}
if pendingSweep.Outpoint.OutputIndex != op.OutputIndex {
t.Fatalf("expected output index %v, got %v", op.OutputIndex,
pendingSweep.Outpoint.OutputIndex)
}
if pendingSweep.SatPerVbyte != bumpFeeReq.SatPerVbyte {
t.Fatalf("expected sweep sat per vbyte %v, got %v",
bumpFeeReq.SatPerVbyte, pendingSweep.SatPerVbyte)
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}
// Mine a block to clean up the unconfirmed transactions.
mineBlocks(t, net, 1, 2)
// The input used to CPFP should no longer be pending.
err = wait.NoError(func() error {
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req := &walletrpc.PendingSweepsRequest{}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
resp, err := net.Bob.WalletKitClient.PendingSweeps(ctxt, req)
if err != nil {
return fmt.Errorf("unable to retrieve bob's pending "+
"sweeps: %v", err)
}
if len(resp.PendingSweeps) != 0 {
return fmt.Errorf("expected 0 pending sweeps, found %d",
len(resp.PendingSweeps))
}
return nil
}, defaultTimeout)
if err != nil {
t.Fatalf(err.Error())
}
}
// testAnchorReservedValue tests that we won't allow sending transactions when
// that would take the value we reserve for anchor fee bumping out of our
// wallet.
func testAnchorReservedValue(net *lntest.NetworkHarness, t *harnessTest) {
// Start two nodes supporting anchor channels.
args := commitTypeAnchors.Args()
alice := net.NewNode(t.t, "Alice", args)
defer shutdownAndAssert(net, t, alice)
bob := net.NewNode(t.t, "Bob", args)
defer shutdownAndAssert(net, t, bob)
ctxb := context.Background()
ctxt, _ := context.WithTimeout(ctxb, defaultTimeout)
net.ConnectNodes(ctxt, t.t, alice, bob)
// Send just enough coins for Alice to open a channel without a change
// output.
const (
chanAmt = 1000000
feeEst = 8000
)
ctxt, _ = context.WithTimeout(context.Background(), defaultTimeout)
net.SendCoins(ctxt, t.t, chanAmt+feeEst, alice)
// wallet, without a change output. This should not be allowed.
resErr := lnwallet.ErrReservedValueInvalidated.Error()
ctxt, _ = context.WithTimeout(context.Background(), defaultTimeout)
_, err := net.OpenChannel(
ctxt, alice, bob,
lntest.OpenChannelParams{
Amt: chanAmt,
},
)
if err == nil || !strings.Contains(err.Error(), resErr) {
t.Fatalf("expected failure, got: %v", err)
}
// Alice opens a smaller channel. This works since it will have a
// change output.
ctxt, _ = context.WithTimeout(context.Background(), defaultTimeout)
aliceChanPoint1 := openChannelAndAssert(
ctxt, t, net, alice, bob,
lntest.OpenChannelParams{
Amt: chanAmt / 4,
},
)
// If Alice tries to open another anchor channel to Bob, Bob should not
// reject it as he is not contributing any funds.
aliceChanPoint2 := openChannelAndAssert(
ctxt, t, net, alice, bob, lntest.OpenChannelParams{
Amt: chanAmt / 4,
},
)
// Similarly, if Alice tries to open a legacy channel to Bob, Bob should
// not reject it as he is not contributing any funds. We'll restart Bob
// to remove his support for anchors.
err = net.RestartNode(bob, nil)
require.NoError(t.t, err)
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
aliceChanPoint3 := openChannelAndAssert(
ctxt, t, net, alice, bob, lntest.OpenChannelParams{
Amt: chanAmt / 4,
},
)
chanPoints := []*lnrpc.ChannelPoint{
aliceChanPoint1, aliceChanPoint2, aliceChanPoint3,
}
for _, chanPoint := range chanPoints {
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
err = alice.WaitForNetworkChannelOpen(ctxt, chanPoint)
require.NoError(t.t, err)
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
err = bob.WaitForNetworkChannelOpen(ctxt, chanPoint)
require.NoError(t.t, err)
}
// Alice tries to send all coins to an internal address. This is
// allowed, since the final wallet balance will still be above the
// reserved value.
addrReq := &lnrpc.NewAddressRequest{
Type: lnrpc.AddressType_WITNESS_PUBKEY_HASH,
}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
resp, err := alice.NewAddress(ctxt, addrReq)
require.NoError(t.t, err)
sweepReq := &lnrpc.SendCoinsRequest{
Addr: resp.Address,
SendAll: true,
}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
_, err = alice.SendCoins(ctxt, sweepReq)
require.NoError(t.t, err)
block := mineBlocks(t, net, 1, 1)[0]
// The sweep transaction should have exactly one input, the change from
// the previous SendCoins call.
sweepTx := block.Transactions[1]
if len(sweepTx.TxIn) != 1 {
t.Fatalf("expected 1 inputs instead have %v", len(sweepTx.TxIn))
}
// It should have a single output.
if len(sweepTx.TxOut) != 1 {
t.Fatalf("expected 1 output instead have %v", len(sweepTx.TxOut))
}
// Wait for Alice to see her balance as confirmed.
waitForConfirmedBalance := func() int64 {
var balance int64
err := wait.NoError(func() error {
req := &lnrpc.WalletBalanceRequest{}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
resp, err := alice.WalletBalance(ctxt, req)
if err != nil {
return err
}
if resp.TotalBalance == 0 {
return fmt.Errorf("no balance")
}
if resp.UnconfirmedBalance > 0 {
return fmt.Errorf("unconfirmed balance")
}
balance = resp.TotalBalance
return nil
}, defaultTimeout)
require.NoError(t.t, err)
return balance
}
_ = waitForConfirmedBalance()
// Alice tries to send all funds to an external address, the reserved
// value must stay in her wallet.
minerAddr, err := net.Miner.NewAddress()
require.NoError(t.t, err)
sweepReq = &lnrpc.SendCoinsRequest{
Addr: minerAddr.String(),
SendAll: true,
}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
_, err = alice.SendCoins(ctxt, sweepReq)
require.NoError(t.t, err)
// We'll mine a block which should include the sweep transaction we
// generated above.
block = mineBlocks(t, net, 1, 1)[0]
// The sweep transaction should have exactly one inputs as we only had
// the the single output from above in the wallet.
sweepTx = block.Transactions[1]
if len(sweepTx.TxIn) != 1 {
t.Fatalf("expected 1 inputs instead have %v", len(sweepTx.TxIn))
}
// It should have two outputs, one being the miner address, the other
// one being the reserve going back to our wallet.
if len(sweepTx.TxOut) != 2 {
t.Fatalf("expected 2 outputs instead have %v", len(sweepTx.TxOut))
}
// The reserved value is now back in Alice's wallet.
aliceBalance := waitForConfirmedBalance()
// Alice closes channel, should now be allowed to send everything to an
// external address.
for _, chanPoint := range chanPoints {
closeChannelAndAssert(ctxt, t, net, alice, chanPoint, false)
}
newBalance := waitForConfirmedBalance()
if newBalance <= aliceBalance {
t.Fatalf("Alice's balance did not increase after channel close")
}
// We'll wait for the balance to reflect that the channel has been
// closed and the funds are in the wallet.
sweepReq = &lnrpc.SendCoinsRequest{
Addr: minerAddr.String(),
SendAll: true,
}
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
_, err = alice.SendCoins(ctxt, sweepReq)
require.NoError(t.t, err)
// We'll mine a block which should include the sweep transaction we
// generated above.
block = mineBlocks(t, net, 1, 1)[0]
// The sweep transaction should have four inputs, the change output from
// the previous sweep, and the outputs from the coop closed channels.
sweepTx = block.Transactions[1]
if len(sweepTx.TxIn) != 4 {
t.Fatalf("expected 4 inputs instead have %v", len(sweepTx.TxIn))
}
// It should have a single output.
if len(sweepTx.TxOut) != 1 {
t.Fatalf("expected 1 output instead have %v", len(sweepTx.TxOut))
}
}