Merge pull request #7879 from ziggie1984/remove-last-sweep-logic

Remove publishing last sweep tx logic during startup.

channeldb/db.go

@@ -25,6 +25,7 @@ import (
 	"github.com/lightningnetwork/lnd/channeldb/migration27"
 	"github.com/lightningnetwork/lnd/channeldb/migration29"
 	"github.com/lightningnetwork/lnd/channeldb/migration30"
+	"github.com/lightningnetwork/lnd/channeldb/migration31"
 	"github.com/lightningnetwork/lnd/channeldb/migration_01_to_11"
 	"github.com/lightningnetwork/lnd/clock"
 	"github.com/lightningnetwork/lnd/kvdb"
@@ -276,6 +277,14 @@ var (
 			number:    29,
 			migration: migration29.MigrateChanID,
 		},
+		{
+			// Removes the "sweeper-last-tx" bucket. Although we
+			// do not have a mandatory version 30 we skip this
+			// version because its naming is already used for the
+			// first optional migration.
+			number:    31,
+			migration: migration31.DeleteLastPublishedTxTLB,
+		},
 	}
 
 	// optionalVersions stores all optional migrations that are applied

channeldb/log.go

@@ -9,6 +9,7 @@ import (
 	"github.com/lightningnetwork/lnd/channeldb/migration16"
 	"github.com/lightningnetwork/lnd/channeldb/migration24"
 	"github.com/lightningnetwork/lnd/channeldb/migration30"
+	"github.com/lightningnetwork/lnd/channeldb/migration31"
 	"github.com/lightningnetwork/lnd/channeldb/migration_01_to_11"
 	"github.com/lightningnetwork/lnd/kvdb"
 )
@@ -40,5 +41,6 @@ func UseLogger(logger btclog.Logger) {
 	migration16.UseLogger(logger)
 	migration24.UseLogger(logger)
 	migration30.UseLogger(logger)
+	migration31.UseLogger(logger)
 	kvdb.UseLogger(logger)
 }

channeldb/migration31/log.go

@@ -0,0 +1,14 @@
+package migration31
+
+import (
+	"github.com/btcsuite/btclog"
+)
+
+// log is a logger that is initialized as disabled.  This means the package will
+// not perform any logging by default until a logger is set.
+var log = btclog.Disabled
+
+// UseLogger uses a specified Logger to output package logging info.
+func UseLogger(logger btclog.Logger) {
+	log = logger
+}

channeldb/migration31/migration.go

@@ -0,0 +1,23 @@
+package migration31
+
+import (
+	"errors"
+
+	"github.com/btcsuite/btcwallet/walletdb"
+	"github.com/lightningnetwork/lnd/kvdb"
+)
+
+// DeleteLastPublishedTxTLB deletes the top level bucket with the key
+// "sweeper-last-tx".
+func DeleteLastPublishedTxTLB(tx kvdb.RwTx) error {
+	log.Infof("Deleting top-level bucket: %x ...", lastTxBucketKey)
+
+	err := tx.DeleteTopLevelBucket(lastTxBucketKey)
+	if err != nil && !errors.Is(err, walletdb.ErrBucketNotFound) {
+		return err
+	}
+
+	log.Infof("Deleted top-level bucket: %x", lastTxBucketKey)
+
+	return nil
+}

channeldb/migration31/migration_test.go

@@ -0,0 +1,48 @@
+package migration31
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/lightningnetwork/lnd/channeldb/migtest"
+	"github.com/lightningnetwork/lnd/kvdb"
+	"github.com/stretchr/testify/require"
+)
+
+var (
+	hexStr = migtest.Hex
+
+	// lastTxBefore is the "sweeper-last-tx" bucket before the migration.
+	// We fill the last-tx value with a dummy hex string because the actual
+	// value is not important when deleting the bucket.
+	lastTxBefore = map[string]interface{}{
+		"sweeper-last-tx": hexStr("0000"),
+	}
+)
+
+// TestDeleteLastPublishTxTLP asserts that the sweeper-last-tx bucket is
+// properly deleted.
+func TestDeleteLastPublishTxTLP(t *testing.T) {
+	t.Parallel()
+
+	// Prime the database with the populated sweeper-last-tx bucket.
+	before := func(tx kvdb.RwTx) error {
+		return migtest.RestoreDB(tx, lastTxBucketKey, lastTxBefore)
+	}
+
+	// After the migration, ensure that the sweeper-last-tx bucket was
+	// properly deleted.
+	after := func(tx kvdb.RwTx) error {
+		err := migtest.VerifyDB(tx, lastTxBucketKey, nil)
+		require.ErrorContains(
+			t, err,
+			fmt.Sprintf("bucket %s not found", lastTxBucketKey),
+		)
+
+		return nil
+	}
+
+	migtest.ApplyMigration(
+		t, before, after, DeleteLastPublishedTxTLB, false,
+	)
+}

channeldb/migration31/store.go

@@ -0,0 +1,9 @@
+package migration31
+
+var (
+	// lastTxBucketKey is the key that points to a bucket containing a
+	// single item storing the last published sweep tx.
+	//
+	// maps: lastTxKey -> serialized_tx
+	lastTxBucketKey = []byte("sweeper-last-tx")
+)

docs/release-notes/release-notes-0.17.0.md

@@ -230,9 +230,19 @@
   creation](https://github.com/lightningnetwork/lnd/pull/7856) that can arise
   under rare scenarios.
 
-- A race condition found between `channel_ready` and link updates is [now
+* A race condition found between `channel_ready` and link updates is [now
   fixed](https://github.com/lightningnetwork/lnd/pull/7518).
 
+* [Remove rebroadcasting of
+  the last sweep-tx](https://github.com/lightningnetwork/lnd/pull/7879). Now at
+  startup of the sweeper we do not rebroadcast the last sweep-tx anymore.
+  The "sweeper-last-tx" top level bucket in the channel.db is removed
+  (new migration version 31 of the db). The main reason is that neutrino
+  backends do not fail broadcasting invalid transactions because BIP157
+  supporting bitcoin core nodes do not reply with the reject msg anymore. So we
+  have to make sure to not broadcast outdated transactions which can lead to
+  locked up wallet funds indefinitely in the worst case.
+
 ### Tooling and documentation
 
 * Add support for [custom `RPCHOST` and

sweep/store.go

@@ -4,23 +4,13 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
-	"fmt"
 
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/lightningnetwork/lnd/kvdb"
 )
 
 var (
-	// lastTxBucketKey is the key that points to a bucket containing a
-	// single item storing the last published tx.
-	//
-	// maps: lastTxKey -> serialized_tx
-	lastTxBucketKey = []byte("sweeper-last-tx")
-
-	// lastTxKey is the fixed key under which the serialized tx is stored.
-	lastTxKey = []byte("last-tx")
-
 	// txHashesBucketKey is the key that points to a bucket containing the
 	// hashes of all sweep txes that were published successfully.
 	//
@@ -52,10 +42,6 @@ type SweeperStore interface {
 	// NotifyPublishTx signals that we are about to publish a tx.
 	NotifyPublishTx(*wire.MsgTx) error
 
-	// GetLastPublishedTx returns the last tx that we called NotifyPublishTx
-	// for.
-	GetLastPublishedTx() (*wire.MsgTx, error)
-
 	// ListSweeps lists all the sweeps we have successfully published.
 	ListSweeps() ([]chainhash.Hash, error)
 }
@@ -69,13 +55,6 @@ func NewSweeperStore(db kvdb.Backend, chainHash *chainhash.Hash) (
 	SweeperStore, error) {
 
 	err := kvdb.Update(db, func(tx kvdb.RwTx) error {
-		_, err := tx.CreateTopLevelBucket(
-			lastTxBucketKey,
-		)
-		if err != nil {
-			return err
-		}
-
 		if tx.ReadWriteBucket(txHashesBucketKey) != nil {
 			return nil
 		}
@@ -171,64 +150,18 @@ func migrateTxHashes(tx kvdb.RwTx, txHashesBucket kvdb.RwBucket,
 // NotifyPublishTx signals that we are about to publish a tx.
 func (s *sweeperStore) NotifyPublishTx(sweepTx *wire.MsgTx) error {
 	return kvdb.Update(s.db, func(tx kvdb.RwTx) error {
-		lastTxBucket := tx.ReadWriteBucket(lastTxBucketKey)
-		if lastTxBucket == nil {
-			return errors.New("last tx bucket does not exist")
-		}
 
 		txHashesBucket := tx.ReadWriteBucket(txHashesBucketKey)
 		if txHashesBucket == nil {
 			return errNoTxHashesBucket
 		}
 
-		var b bytes.Buffer
-		if err := sweepTx.Serialize(&b); err != nil {
-			return err
-		}
-
-		if err := lastTxBucket.Put(lastTxKey, b.Bytes()); err != nil {
-			return err
-		}
-
 		hash := sweepTx.TxHash()
 
 		return txHashesBucket.Put(hash[:], []byte{})
 	}, func() {})
 }
 
-// GetLastPublishedTx returns the last tx that we called NotifyPublishTx
-// for.
-func (s *sweeperStore) GetLastPublishedTx() (*wire.MsgTx, error) {
-	var sweepTx *wire.MsgTx
-
-	err := kvdb.View(s.db, func(tx kvdb.RTx) error {
-		lastTxBucket := tx.ReadBucket(lastTxBucketKey)
-		if lastTxBucket == nil {
-			return errors.New("last tx bucket does not exist")
-		}
-
-		sweepTxRaw := lastTxBucket.Get(lastTxKey)
-		if sweepTxRaw == nil {
-			return nil
-		}
-
-		sweepTx = &wire.MsgTx{}
-		txReader := bytes.NewReader(sweepTxRaw)
-		if err := sweepTx.Deserialize(txReader); err != nil {
-			return fmt.Errorf("tx deserialize: %v", err)
-		}
-
-		return nil
-	}, func() {
-		sweepTx = nil
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	return sweepTx, nil
-}
-
 // IsOurTx determines whether a tx is published by us, based on its
 // hash.
 func (s *sweeperStore) IsOurTx(hash chainhash.Hash) (bool, error) {

sweep/store_mock.go

@@ -8,7 +8,6 @@ import (
 // MockSweeperStore is a mock implementation of sweeper store. This type is
 // exported, because it is currently used in nursery tests too.
 type MockSweeperStore struct {
-	lastTx  *wire.MsgTx
 	ourTxes map[chainhash.Hash]struct{}
 }
 
@@ -30,17 +29,10 @@ func (s *MockSweeperStore) IsOurTx(hash chainhash.Hash) (bool, error) {
 func (s *MockSweeperStore) NotifyPublishTx(tx *wire.MsgTx) error {
 	txHash := tx.TxHash()
 	s.ourTxes[txHash] = struct{}{}
-	s.lastTx = tx
 
 	return nil
 }
 
-// GetLastPublishedTx returns the last tx that we called NotifyPublishTx
-// for.
-func (s *MockSweeperStore) GetLastPublishedTx() (*wire.MsgTx, error) {
-	return s.lastTx, nil
-}
-
 // ListSweeps lists all the sweeps we have successfully published.
 func (s *MockSweeperStore) ListSweeps() ([]chainhash.Hash, error) {
 	var txns []chainhash.Hash

sweep/store_test.go

@@ -42,15 +42,6 @@ func testStore(t *testing.T, createStore func() (SweeperStore, error)) {
 		t.Fatal(err)
 	}
 
-	// Initially we expect the store not to have a last published tx.
-	retrievedTx, err := store.GetLastPublishedTx()
-	if err != nil {
-		t.Fatal(err)
-	}
-	if retrievedTx != nil {
-		t.Fatal("expected no last published tx")
-	}
-
 	// Notify publication of tx1
 	tx1 := wire.MsgTx{}
 	tx1.AddTxIn(&wire.TxIn{
@@ -83,16 +74,6 @@ func testStore(t *testing.T, createStore func() (SweeperStore, error)) {
 		t.Fatal(err)
 	}
 
-	// Assert that last published tx2 is present.
-	retrievedTx, err = store.GetLastPublishedTx()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if tx2.TxHash() != retrievedTx.TxHash() {
-		t.Fatal("txes do not match")
-	}
-
 	// Assert that both txes are recognized as our own.
 	ours, err := store.IsOurTx(tx1.TxHash())
 	if err != nil {

sweep/sweeper.go

@@ -340,30 +340,6 @@ func (s *UtxoSweeper) Start() error {
 
 	log.Info("Sweeper starting")
 
-	// Retrieve last published tx from database.
-	lastTx, err := s.cfg.Store.GetLastPublishedTx()
-	if err != nil {
-		return fmt.Errorf("get last published tx: %v", err)
-	}
-
-	// Republish in case the previous call crashed lnd. We don't care about
-	// the return value, because inputs will be re-offered and retried
-	// anyway. The only reason we republish here is to prevent the corner
-	// case where lnd goes into a restart loop because of a crashing publish
-	// tx where we keep deriving new output script. By publishing and
-	// possibly crashing already now, we haven't derived a new output script
-	// yet.
-	if lastTx != nil {
-		log.Debugf("Publishing last tx %v", lastTx.TxHash())
-
-		// Error can be ignored. Because we are starting up, there are
-		// no pending inputs to update based on the publish result.
-		err := s.cfg.Wallet.PublishTransaction(lastTx, "")
-		if err != nil && err != lnwallet.ErrDoubleSpend {
-			log.Errorf("last tx publish: %v", err)
-		}
-	}
-
 	// Retrieve relay fee for dust limit calculation. Assume that this will
 	// not change from here on.
 	s.relayFeeRate = s.cfg.FeeEstimator.RelayFeePerKW()