feat(driver): check maxBytesPerTxList for compressed txlist bytes

driver/chain_syncer/blob/syncer.go

@@ -26,20 +26,20 @@ import (
 	"github.com/taikoxyz/taiko-client/pkg/rpc"
 
 	anchorTxConstructor "github.com/taikoxyz/taiko-client/driver/anchor_tx_constructor"
-	txlistfetcher "github.com/taikoxyz/taiko-client/driver/txlist_fetcher"
+	txListDecomporessor "github.com/taikoxyz/taiko-client/driver/txlist_decompressor"
+	txlistFetcher "github.com/taikoxyz/taiko-client/driver/txlist_fetcher"
 	eventIterator "github.com/taikoxyz/taiko-client/pkg/chain_iterator/event_iterator"
-	txListValidator "github.com/taikoxyz/taiko-client/pkg/txlist_validator"
 )
 
 // Syncer responsible for letting the L2 execution engine catching up with protocol's latest
 // pending block through deriving L1 calldata.
 type Syncer struct {
-	ctx               context.Context
-	rpc               *rpc.Client
-	state             *state.State
-	progressTracker   *beaconsync.SyncProgressTracker          // Sync progress tracker
-	anchorConstructor *anchorTxConstructor.AnchorTxConstructor // TaikoL2.anchor transactions constructor
-	txListValidator   *txListValidator.TxListValidator         // Transactions list validator
+	ctx                context.Context
+	rpc                *rpc.Client
+	state              *state.State
+	progressTracker    *beaconsync.SyncProgressTracker          // Sync progress tracker
+	anchorConstructor  *anchorTxConstructor.AnchorTxConstructor // TaikoL2.anchor transactions constructor
+	txListDecompressor *txListDecomporessor.TxListDecompressor  // Transactions list decompressor
 	// Used by BlockInserter
 	lastInsertedBlockID *big.Int
 	reorgDetectedFlag   bool
@@ -72,7 +72,7 @@ func NewSyncer(
 		state:             state,
 		progressTracker:   progressTracker,
 		anchorConstructor: constructor,
-		txListValidator: txListValidator.NewTxListValidator(
+		txListDecompressor: txListDecomporessor.NewTxListDecompressor(
 			uint64(configs.BlockMaxGasLimit),
 			rpc.BlockMaxTxListBytes,
 			client.L2.ChainID,
@@ -246,38 +246,29 @@ func (s *Syncer) onBlockProposed(
 	}
 
 	// Decode transactions list.
-	var txListDecoder txlistfetcher.TxListFetcher
+	var txListFecher txlistFetcher.TxListFetcher
 	if event.Meta.BlobUsed {
-		txListDecoder = txlistfetcher.NewBlobTxListFetcher(s.rpc.L1Beacon, s.blobDatasource)
+		txListFecher = txlistFetcher.NewBlobTxListFetcher(s.rpc.L1Beacon, s.blobDatasource)
 	} else {
-		txListDecoder = new(txlistfetcher.CalldataFetcher)
+		txListFecher = new(txlistFetcher.CalldataFetcher)
 	}
-	txListBytes, err := txListDecoder.Fetch(ctx, tx, &event.Meta)
+	txListBytes, err := txListFecher.Fetch(ctx, tx, &event.Meta)
 	if err != nil {
 		if errors.Is(err, rpc.ErrBlobInvalid) {
 			log.Info("Invalid blob detected", "blockID", event.BlockId)
 			txListBytes = []byte{}
 		} else {
-			return fmt.Errorf("failed to decode tx list: %w", err)
+			return fmt.Errorf("failed to fetch tx list: %w", err)
 		}
 	}
 
-	if txListBytes, err = utils.Decompress(txListBytes); err != nil {
-		return fmt.Errorf("failed to decompress tx list bytes: %w", err)
-	}
-
-	// If the transactions list is invalid, we simply insert an empty L2 block.
-	if !s.txListValidator.ValidateTxList(event.BlockId, txListBytes, event.Meta.BlobUsed) {
-		log.Info("Invalid transactions list, insert an empty L2 block instead", "blockID", event.BlockId)
-		txListBytes = []byte{}
-	}
-
+	// Decompress the transactions list and try to insert a new head block to L2 EE.
 	payloadData, err := s.insertNewHead(
 		ctx,
 		event,
 		parent,
 		s.state.GetHeadBlockID(),
-		txListBytes,
+		s.txListDecompressor.TryDecomporess(event.BlockId, txListBytes, event.Meta.BlobUsed),
 		&rawdb.L1Origin{
 			BlockID:       event.BlockId,
 			L2BlockHash:   common.Hash{}, // Will be set by taiko-geth.

driver/txlist_decompressor/txlist_decomporessor.go

@@ -0,0 +1,76 @@
+package txlistdecompressor
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/rlp"
+	"github.com/taikoxyz/taiko-client/internal/utils"
+)
+
+// TxListDecompressor is responsible for validating and decompressing
+// the transactions list in a TaikoL1.proposeBlock transaction.
+type TxListDecompressor struct {
+	blockMaxGasLimit  uint64
+	maxBytesPerTxList uint64
+	chainID           *big.Int
+}
+
+// NewTxListDecompressor creates a new TxListDecompressor instance based on giving configurations.
+func NewTxListDecompressor(
+	blockMaxGasLimit uint64,
+	maxBytesPerTxList uint64,
+	chainID *big.Int,
+) *TxListDecompressor {
+	return &TxListDecompressor{
+		blockMaxGasLimit:  blockMaxGasLimit,
+		maxBytesPerTxList: maxBytesPerTxList,
+		chainID:           chainID,
+	}
+}
+
+// TryDecomporess validates and decompresses whether the transactions list in the TaikoL1.proposeBlock transaction's
+// input data is valid, the rules are:
+// - If the transaction list is empty, it's valid.
+// - If the transaction list is not empty:
+//  1. If the transaction list is using calldata, the compressed bytes of the transaction list must be
+//     less than or equal to maxBytesPerTxList.
+//  2. The transaction list bytes must be able to be RLP decoded into a list of transactions.
+func (v *TxListDecompressor) TryDecomporess(
+	blockID *big.Int,
+	txListBytes []byte,
+	blobUsed bool,
+) []byte {
+	// If the transaction list is empty, it's valid.
+	if len(txListBytes) == 0 {
+		return []byte{}
+	}
+
+	// If calldata is used, the compressed bytes of the transaction list must be
+	// less than or equal to maxBytesPerTxList.
+	if !blobUsed && (len(txListBytes) > int(v.maxBytesPerTxList)) {
+		log.Info("Compressed transactions list binary too large", "length", len(txListBytes), "blockID", blockID)
+		return []byte{}
+	}
+
+	var (
+		txs types.Transactions
+		err error
+	)
+
+	// Decompress the transaction list bytes.
+	if txListBytes, err = utils.Decompress(txListBytes); err != nil {
+		log.Info("Failed to decompress tx list bytes", "blockID", blockID, "error", err)
+		return []byte{}
+	}
+
+	// Try to RLP decode the transaction list bytes.
+	if err = rlp.DecodeBytes(txListBytes, &txs); err != nil {
+		log.Info("Failed to decode transactions list bytes", "blockID", blockID, "error", err)
+		return []byte{}
+	}
+
+	log.Info("Transaction list is valid", "blockID", blockID)
+	return txListBytes
+}

pkg/txlist_validator/tx_list_validator_test.go → driver/txlist_decompressor/txlist_decomporessor_test.go

@@ -1,4 +1,4 @@
-package txlistvalidator
+package txlistdecompressor
 
 import (
 	"crypto/rand"
@@ -13,6 +13,7 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/stretchr/testify/require"
+	"github.com/taikoxyz/taiko-client/internal/utils"
 )
 
 var (
@@ -30,48 +31,50 @@ var (
 	}
 )
 
-func TestIsTxListValid(t *testing.T) {
-	v := NewTxListValidator(
+func TestDecomporess(t *testing.T) {
+	d := NewTxListDecompressor(
 		maxBlocksGasLimit,
 		maxTxlistBytes,
 		chainID,
 	)
+	compressed, err := utils.Compress(rlpEncodedTransactionBytes(1, true))
+	require.NoError(t, err)
+
 	tests := []struct {
-		name        string
-		blockID     *big.Int
-		txListBytes []byte
-		isValid     bool
+		name         string
+		blockID      *big.Int
+		txListBytes  []byte
+		decompressed []byte
 	}{
 		{
 			"txListBytes binary too large",
 			chainID,
 			randBytes(maxTxlistBytes + 1),
-			false,
+			[]byte{},
 		},
 		{
 			"txListBytes not decodable to rlp",
 			chainID,
 			randBytes(0x1),
-			false,
+			[]byte{},
 		},
 		{
 			"success empty tx list",
 			chainID,
 			rlpEncodedTransactionBytes(0, true),
-			true,
+			[]byte{},
 		},
 		{
 			"success non-empty tx list",
 			chainID,
+			compressed,
 			rlpEncodedTransactionBytes(1, true),
-			true,
 		},
 	}
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			isValid := v.ValidateTxList(tt.blockID, tt.txListBytes, false)
-			require.Equal(t, tt.isValid, isValid)
+			require.Equal(t, tt.decompressed, d.TryDecomporess(tt.blockID, tt.txListBytes, false))
 		})
 	}
 }