sweep: refactor IsOurTx to not return an error

Before this commit, the only error returned from `IsOurTx` is when the
root bucket was not created. In that case, we should consider the tx to
be not found in our db, since technically our db is empty.

A future PR may consider treating our wallet as the single source of
truth and query the wallet instead to check for past sweeping txns.

sweep/mock_test.go

@@ -24,10 +24,10 @@ func NewMockSweeperStore() *MockSweeperStore {
 }
 
 // IsOurTx determines whether a tx is published by us, based on its hash.
-func (s *MockSweeperStore) IsOurTx(hash chainhash.Hash) (bool, error) {
+func (s *MockSweeperStore) IsOurTx(hash chainhash.Hash) bool {
 	args := s.Called(hash)
 
-	return args.Bool(0), args.Error(1)
+	return args.Bool(0)
 }
 
 // StoreTx stores a tx we are about to publish.

sweep/store.go

@@ -121,7 +121,7 @@ func deserializeTxRecord(r io.Reader) (*TxRecord, error) {
 type SweeperStore interface {
 	// IsOurTx determines whether a tx is published by us, based on its
 	// hash.
-	IsOurTx(hash chainhash.Hash) (bool, error)
+	IsOurTx(hash chainhash.Hash) bool
 
 	// StoreTx stores a tx hash we are about to publish.
 	StoreTx(*TxRecord) error
@@ -276,15 +276,17 @@ func (s *sweeperStore) StoreTx(tr *TxRecord) error {
 	}, func() {})
 }
 
-// IsOurTx determines whether a tx is published by us, based on its
-// hash.
-func (s *sweeperStore) IsOurTx(hash chainhash.Hash) (bool, error) {
+// IsOurTx determines whether a tx is published by us, based on its hash.
+func (s *sweeperStore) IsOurTx(hash chainhash.Hash) bool {
 	var ours bool
 
 	err := kvdb.View(s.db, func(tx kvdb.RTx) error {
 		txHashesBucket := tx.ReadBucket(txHashesBucketKey)
+		// If the root bucket cannot be found, we consider the tx to be
+		// not found in our db.
 		if txHashesBucket == nil {
-			return errNoTxHashesBucket
+			log.Error("Tx hashes bucket not found in sweeper store")
+			return nil
 		}
 
 		ours = txHashesBucket.Get(hash[:]) != nil
@@ -294,10 +296,10 @@ func (s *sweeperStore) IsOurTx(hash chainhash.Hash) (bool, error) {
 		ours = false
 	})
 	if err != nil {
-		return false, err
+		return false
 	}
 
-	return ours, nil
+	return ours
 }
 
 // ListSweeps lists all the sweep transactions we have in the sweeper store.

sweep/store_test.go

@@ -57,18 +57,15 @@ func TestStore(t *testing.T) {
 	require.NoError(t, err)
 
 	// Assert that both txes are recognized as our own.
-	ours, err := store.IsOurTx(tx1.TxHash())
-	require.NoError(t, err)
+	ours := store.IsOurTx(tx1.TxHash())
 	require.True(t, ours, "expected tx to be ours")
 
-	ours, err = store.IsOurTx(tx2.TxHash())
-	require.NoError(t, err)
+	ours = store.IsOurTx(tx2.TxHash())
 	require.True(t, ours, "expected tx to be ours")
 
 	// An different hash should be reported as not being ours.
 	var unknownHash chainhash.Hash
-	ours, err = store.IsOurTx(unknownHash)
-	require.NoError(t, err)
+	ours = store.IsOurTx(unknownHash)
 	require.False(t, ours, "expected tx to not be ours")
 
 	txns, err := store.ListSweeps()

sweep/sweeper.go

@@ -1394,12 +1394,7 @@ func (s *UtxoSweeper) handleExistingInput(input *sweepInputMessage,
 func (s *UtxoSweeper) handleInputSpent(spend *chainntnfs.SpendDetail) {
 	// Query store to find out if we ever published this tx.
 	spendHash := *spend.SpenderTxHash
-	isOurTx, err := s.cfg.Store.IsOurTx(spendHash)
-	if err != nil {
-		log.Errorf("cannot determine if tx %v is ours: %v",
-			spendHash, err)
-		return
-	}
+	isOurTx := s.cfg.Store.IsOurTx(spendHash)
 
 	// If this isn't our transaction, it means someone else swept outputs
 	// that we were attempting to sweep. This can happen for anchor outputs
@@ -1879,22 +1874,7 @@ func (s *UtxoSweeper) handleBumpEvent(r *bumpResp) error {
 // NOTE: It is enough to check the txid because the sweeper will create
 // outpoints which solely belong to the internal LND wallet.
 func (s *UtxoSweeper) IsSweeperOutpoint(op wire.OutPoint) bool {
-	found, err := s.cfg.Store.IsOurTx(op.Hash)
-	// In case there is an error fetching the transaction details from the
-	// sweeper store we assume the outpoint is still used by the sweeper
-	// (worst case scenario).
-	//
-	// TODO(ziggie): Ensure that confirmed outpoints are deleted from the
-	// bucket.
-	if err != nil && !errors.Is(err, errNoTxHashesBucket) {
-		log.Errorf("failed to fetch info for outpoint(%v:%d) "+
-			"with: %v, we assume it is still in use by the sweeper",
-			op.Hash, op.Index, err)
-
-		return true
-	}
-
-	return found
+	return s.cfg.Store.IsOurTx(op.Hash)
 }
 
 // markInputSwept marks the given input as swept by the tx. It will also notify
@@ -1923,11 +1903,7 @@ func (s *UtxoSweeper) handleUnknownSpendTx(inp *SweeperInput, tx *wire.MsgTx) {
 	op := inp.OutPoint()
 	txid := tx.TxHash()
 
-	isOurTx, err := s.cfg.Store.IsOurTx(txid)
-	if err != nil {
-		log.Errorf("Cannot determine if tx %v is ours: %v", txid, err)
-		return
-	}
+	isOurTx := s.cfg.Store.IsOurTx(txid)
 
 	// If this is our tx, it means it's a previous sweeping tx that got
 	// confirmed, which could happen when a restart happens during the
@@ -1955,7 +1931,7 @@ func (s *UtxoSweeper) handleUnknownSpendTx(inp *SweeperInput, tx *wire.MsgTx) {
 		spentInputs[txIn.PreviousOutPoint] = struct{}{}
 	}
 
-	err = s.removeConflictSweepDescendants(spentInputs)
+	err := s.removeConflictSweepDescendants(spentInputs)
 	if err != nil {
 		log.Warnf("unable to remove descendant transactions "+
 			"due to tx %v: ", txid)

sweep/sweeper_test.go

@@ -1227,7 +1227,7 @@ func TestHandleUnknownSpendTxOurs(t *testing.T) {
 	txid := tx.TxHash()
 
 	// Mock the store to return true when calling IsOurTx.
-	store.On("IsOurTx", txid).Return(true, nil).Once()
+	store.On("IsOurTx", txid).Return(true).Once()
 
 	// Call the method under test.
 	s.handleUnknownSpendTx(si, tx)
@@ -1271,7 +1271,7 @@ func TestHandleInputSpendTxThirdParty(t *testing.T) {
 	txid := tx.TxHash()
 
 	// Mock the store to return false when calling IsOurTx.
-	store.On("IsOurTx", txid).Return(false, nil).Once()
+	store.On("IsOurTx", txid).Return(false).Once()
 
 	// Mock `ListSweeps` to return an empty slice as we are testing the
 	// workflow here, not the method `removeConflictSweepDescendants`.
@@ -1333,7 +1333,7 @@ func TestHandleBumpEventTxUnknownSpendNoRetry(t *testing.T) {
 	}
 
 	// Mock the store to return true when calling IsOurTx.
-	store.On("IsOurTx", txid).Return(true, nil).Once()
+	store.On("IsOurTx", txid).Return(true).Once()
 
 	// Call the method under test.
 	s.handleBumpEventTxUnknownSpend(resp)
@@ -1419,7 +1419,7 @@ func TestHandleBumpEventTxUnknownSpendWithRetry(t *testing.T) {
 	}
 
 	// Mock the store to return true when calling IsOurTx.
-	store.On("IsOurTx", txid).Return(true, nil).Once()
+	store.On("IsOurTx", txid).Return(true).Once()
 
 	// Mock the aggregator to return an empty slice as we are not testing
 	// the actual sweeping behavior.