simplify the encode and decode logic about sidecar

core/txpool/legacypool/legacypool.go

@@ -946,8 +946,8 @@ func (pool *LegacyPool) addRemoteSync(tx *types.Transaction) error {
 func (pool *LegacyPool) Add(txs []*types.Transaction, sync bool) []error {
 	// Filter out known ones without obtaining the pool lock or recovering signatures
 	var (
-		errs = make([]error, len(txs))
-		news = make([]*types.Transaction, 0, len(txs))
+		errs        = make([]error, len(txs))
+		verifiedTxs int
 	)
 	for i, tx := range txs {
 		// If the transaction is known, pre-set the error slot
@@ -965,26 +965,18 @@ func (pool *LegacyPool) Add(txs []*types.Transaction, sync bool) []error {
 			invalidTxMeter.Mark(1)
 			continue
 		}
-		// Accumulate all unknown transactions for deeper processing
-		news = append(news, tx)
+		verifiedTxs++
 	}
-	if len(news) == 0 {
+	if verifiedTxs == 0 {
 		return errs
 	}
 
 	// Process all the new transaction and merge any errors into the original slice
+	var dirtyAddrs *accountSet
 	pool.mu.Lock()
-	newErrs, dirtyAddrs := pool.addTxsLocked(news)
+	errs, dirtyAddrs = pool.addTxsLocked(txs, errs)
 	pool.mu.Unlock()
 
-	var nilSlot = 0
-	for _, err := range newErrs {
-		for errs[nilSlot] != nil {
-			nilSlot++
-		}
-		errs[nilSlot] = err
-		nilSlot++
-	}
 	// Reorg the pool internals if needed and return
 	done := pool.requestPromoteExecutables(dirtyAddrs)
 	if sync {
@@ -995,10 +987,15 @@ func (pool *LegacyPool) Add(txs []*types.Transaction, sync bool) []error {
 
 // addTxsLocked attempts to queue a batch of transactions if they are valid.
 // The transaction pool lock must be held.
-func (pool *LegacyPool) addTxsLocked(txs []*types.Transaction) ([]error, *accountSet) {
+func (pool *LegacyPool) addTxsLocked(txs []*types.Transaction, errs []error) ([]error, *accountSet) {
 	dirty := newAccountSet(pool.signer)
-	errs := make([]error, len(txs))
+	if errs == nil {
+		errs = make([]error, len(txs))
+	}
 	for i, tx := range txs {
+		if errs[i] != nil {
+			continue
+		}
 		replaced, err := pool.add(tx)
 		errs[i] = err
 		if err == nil && !replaced {
@@ -1439,7 +1436,7 @@ func (pool *LegacyPool) reset(oldHead, newHead *types.Header) {
 	// Inject any transactions discarded due to reorgs
 	log.Debug("Reinjecting stale transactions", "count", len(reinject))
 	core.SenderCacher().Recover(pool.signer, reinject)
-	pool.addTxsLocked(reinject)
+	pool.addTxsLocked(reinject, nil)
 }
 
 // promoteExecutables moves transactions that have become processable from the

core/types/tx_blob.go

@@ -19,7 +19,6 @@ package types
 import (
 	"bytes"
 	"crypto/sha256"
-	"errors"
 	"fmt"
 	"math/big"
 	"slices"
@@ -113,10 +112,7 @@ func (sc *BlobTxSidecar) CellProofsAt(idx int) ([]kzg4844.Proof, error) {
 
 // ToV1 converts the BlobSidecar to version 1, attaching the cell proofs.
 func (sc *BlobTxSidecar) ToV1() error {
-	if sc.Version == BlobSidecarVersion1 {
-		return nil
-	}
-	if sc.Version == BlobSidecarVersion0 {
+	if sc.Version != BlobSidecarVersion1 {
 		proofs := make([]kzg4844.Proof, 0, len(sc.Blobs)*kzg4844.CellProofsPerBlob)
 		for _, blob := range sc.Blobs {
 			cellProofs, err := kzg4844.ComputeCellProofs(&blob)
@@ -183,48 +179,6 @@ type blobTxWithBlobs interface {
 	assign(*BlobTxSidecar) error
 }
 
-type blobTxWithBlobsV0 struct {
-	BlobTx      *BlobTx
-	Blobs       []kzg4844.Blob
-	Commitments []kzg4844.Commitment
-	Proofs      []kzg4844.Proof
-}
-
-type blobTxWithBlobsV1 struct {
-	BlobTx      *BlobTx
-	Version     byte
-	Blobs       []kzg4844.Blob
-	Commitments []kzg4844.Commitment
-	Proofs      []kzg4844.Proof
-}
-
-func (btx *blobTxWithBlobsV0) tx() *BlobTx {
-	return btx.BlobTx
-}
-
-func (btx *blobTxWithBlobsV0) assign(sc *BlobTxSidecar) error {
-	sc.Version = BlobSidecarVersion0
-	sc.Blobs = btx.Blobs
-	sc.Commitments = btx.Commitments
-	sc.Proofs = btx.Proofs
-	return nil
-}
-
-func (btx *blobTxWithBlobsV1) tx() *BlobTx {
-	return btx.BlobTx
-}
-
-func (btx *blobTxWithBlobsV1) assign(sc *BlobTxSidecar) error {
-	if btx.Version != BlobSidecarVersion1 {
-		return fmt.Errorf("unsupported blob tx version %d", btx.Version)
-	}
-	sc.Version = BlobSidecarVersion1
-	sc.Blobs = btx.Blobs
-	sc.Commitments = btx.Commitments
-	sc.Proofs = btx.Proofs
-	return nil
-}
-
 // copy creates a deep copy of the transaction data and initializes all fields.
 func (tx *BlobTx) copy() TxData {
 	cpy := &BlobTx{
@@ -326,98 +280,29 @@ func (tx *BlobTx) withSidecar(sideCar *BlobTxSidecar) *BlobTx {
 }
 
 func (tx *BlobTx) encode(b *bytes.Buffer) error {
-	switch {
-	case tx.Sidecar == nil:
-		return rlp.Encode(b, tx)
-
-	case tx.Sidecar.Version == BlobSidecarVersion0:
-		return rlp.Encode(b, &blobTxWithBlobsV0{
-			BlobTx:      tx,
-			Blobs:       tx.Sidecar.Blobs,
-			Commitments: tx.Sidecar.Commitments,
-			Proofs:      tx.Sidecar.Proofs,
-		})
-
-	case tx.Sidecar.Version == BlobSidecarVersion1:
-		return rlp.Encode(b, &blobTxWithBlobsV1{
-			BlobTx:      tx,
-			Version:     tx.Sidecar.Version,
-			Blobs:       tx.Sidecar.Blobs,
-			Commitments: tx.Sidecar.Commitments,
-			Proofs:      tx.Sidecar.Proofs,
-		})
-
-	default:
-		return errors.New("unsupported sidecar version")
+	if err := rlp.Encode(b, tx); err != nil {
+		return err
 	}
+	if tx.Sidecar != nil {
+		return rlp.Encode(b, tx.Sidecar)
+	}
+	return nil
 }
 
 func (tx *BlobTx) decode(input []byte) error {
-	// Here we need to support two outer formats: the network protocol encoding of the tx
-	// (with blobs) or the canonical encoding without blobs.
-	//
-	// The canonical encoding is just a list of fields:
-	//
-	//     [chainID, nonce, ...]
-	//
-	// The network encoding is a list where the first element is the tx in the canonical encoding,
-	// and the remaining elements are the 'sidecar':
-	//
-	//     [[chainID, nonce, ...], ...]
-	//
-	// The two outer encodings can be distinguished by checking whether the first element
-	// of the input list is itself a list. If it's the canonical encoding, the first
-	// element is the chainID, which is a number.
-
-	firstElem, _, err := rlp.SplitList(input)
+	bLen, err := rlp.DecodeBytesV1(input, tx)
 	if err != nil {
 		return err
 	}
-	firstElemKind, _, secondElem, err := rlp.Split(firstElem)
-	if err != nil {
-		return err
+	// If the input is shorter than the RLP-encoded transaction, it means
+	// that the transaction does not have a sidecar.
+	if len(input) > bLen {
+		var sidecar *BlobTxSidecar
+		if err = rlp.DecodeBytes(input[bLen:], &sidecar); err != nil {
+			return err
+		}
+		tx.Sidecar = sidecar
 	}
-	if firstElemKind != rlp.List {
-		// Blob tx without blobs.
-		return rlp.DecodeBytes(input, tx)
-	}
-
-	// Now we know it's the network encoding with the blob sidecar. Here we again need to
-	// support multiple encodings: legacy sidecars (v0) with a blob proof, and versioned
-	// sidecars.
-	//
-	// The legacy encoding is:
-	//
-	//     [tx, blobs, commitments, proofs]
-	//
-	// The versioned encoding is:
-	//
-	//     [tx, version, blobs, ...]
-	//
-	// We can tell the two apart by checking whether the second element is the version byte.
-	// For legacy sidecar the second element is a list of blobs.
-
-	secondElemKind, _, _, err := rlp.Split(secondElem)
-	if err != nil {
-		return err
-	}
-	var payload blobTxWithBlobs
-	if secondElemKind == rlp.List {
-		// No version byte: blob sidecar v0.
-		payload = new(blobTxWithBlobsV0)
-	} else {
-		// It has a version byte. Decode as v1, version is checked by assign()
-		payload = new(blobTxWithBlobsV1)
-	}
-	if err := rlp.DecodeBytes(input, payload); err != nil {
-		return err
-	}
-	sc := new(BlobTxSidecar)
-	if err := payload.assign(sc); err != nil {
-		return err
-	}
-	*tx = *payload.tx()
-	tx.Sidecar = sc
 	return nil
 }
 

rlp/decode.go

@@ -105,6 +105,23 @@ func DecodeBytes(b []byte, val interface{}) error {
 	return nil
 }
 
+// DecodeBytesV1 parses RLP data from b into val. Please see package-level documentation for
+// the decoding rules. The input must contain exactly one value and no trailing data.
+// DecodeBytesV1 is similar to DecodeBytes, but it returns the number of bytes read from b.
+func DecodeBytesV1(b []byte, val interface{}) (int, error) {
+	r := (*sliceReader)(&b)
+
+	stream := streamPool.Get().(*Stream)
+	defer streamPool.Put(stream)
+
+	bLen := len(b)
+	stream.Reset(r, uint64(bLen))
+	if err := stream.Decode(val); err != nil {
+		return 0, err
+	}
+	return bLen - len(b), nil
+}
+
 type decodeError struct {
 	msg string
 	typ reflect.Type