feat: add replay mode

runner/benchmark/definition.go

@@ -99,6 +99,18 @@ type DatadirConfig struct {
 	Validator *string `yaml:"validator"`
 }
 
+// ReplayConfig specifies configuration for replaying transactions from an
+// external node instead of generating synthetic transactions.
+type ReplayConfig struct {
+	// SourceRPCURL is the RPC endpoint of the node to fetch transactions from
+	SourceRPCURL string `yaml:"source_rpc_url"`
+
+	// StartBlock is the first block to replay transactions from.
+	// If not specified (0), it will be automatically detected from the
+	// snapshot's head block + 1.
+	StartBlock uint64 `yaml:"start_block,omitempty"`
+}
+
 // TestDefinition is the user-facing YAML configuration for specifying a
 // matrix of benchmark runs.
 type TestDefinition struct {
@@ -108,6 +120,7 @@ type TestDefinition struct {
 	Tags         *map[string]string   `yaml:"tags"`
 	Variables    []Param              `yaml:"variables"`
 	ProofProgram *ProofProgramOptions `yaml:"proof_program"`
+	Replay       *ReplayConfig        `yaml:"replay"`
 }
 
 func (bc *TestDefinition) Check() error {

runner/benchmark/matrix.go

@@ -17,6 +17,7 @@ type TestPlan struct {
 	Snapshot     *SnapshotDefinition
 	ProofProgram *ProofProgramOptions
 	Thresholds   *ThresholdConfig
+	Replay       *ReplayConfig
 }
 
 func NewTestPlanFromConfig(c TestDefinition, testFileName string, config *BenchmarkConfig) (*TestPlan, error) {
@@ -42,6 +43,7 @@ func NewTestPlanFromConfig(c TestDefinition, testFileName string, config *Benchm
 		Snapshot:     c.Snapshot,
 		ProofProgram: proofProgram,
 		Thresholds:   c.Metrics,
+		Replay:       c.Replay,
 	}, nil
 }
 

runner/network/consensus/client.go

@@ -21,6 +21,10 @@ type ConsensusClientOptions struct {
 	GasLimit uint64
 	// GasLimitSetup is the gas limit for the setup payload
 	GasLimitSetup uint64
+	// AllowTxFailures allows transactions to fail without stopping the benchmark.
+	// When true, failed transactions are logged as warnings instead of errors.
+	// Useful for replay mode where some transactions may fail due to state differences.
+	AllowTxFailures bool
 }
 
 // BaseConsensusClient contains common functionality shared between different consensus client implementations.

runner/network/consensus/validator_consensus.go

@@ -64,18 +64,18 @@ func (f *SyncingConsensusClient) propose(ctx context.Context, payload *engine.Ex
 }
 
 // Start starts the fake consensus client.
-func (f *SyncingConsensusClient) Start(ctx context.Context, payloads []engine.ExecutableData, metricsCollector metrics.Collector, firstTestBlock uint64) error {
+func (f *SyncingConsensusClient) Start(ctx context.Context, payloads []engine.ExecutableData, metricsCollector metrics.Collector, lastSetupBlock uint64) error {
 	f.log.Info("Starting sync benchmark", "num_payloads", len(payloads))
 	m := metrics.NewBlockMetrics()
 	for i := 0; i < len(payloads); i++ {
-		m.SetBlockNumber(uint64(max(0, int(payloads[i].Number)-int(firstTestBlock))))
+		m.SetBlockNumber(uint64(max(0, int(payloads[i].Number)-int(lastSetupBlock))))
 		f.log.Info("Proposing payload", "payload_index", i)
 		err := f.propose(ctx, &payloads[i], m)
 		if err != nil {
 			return err
 		}
 
-		if payloads[i].Number >= firstTestBlock {
+		if payloads[i].Number > lastSetupBlock {
 			err = metricsCollector.Collect(ctx, m)
 			if err != nil {
 				f.log.Error("Failed to collect metrics", "error", err)

runner/network/mempool/replay_mempool.go

@@ -0,0 +1,136 @@
+package mempool
+
+import (
+	"context"
+	"math/big"
+	"sync"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+// ReplayMempool fetches transactions from an external node and replays them.
+// It iterates through blocks from a source node and provides transactions
+// block-by-block for the benchmark to replay.
+type ReplayMempool struct {
+	log    log.Logger
+	client *ethclient.Client
+
+	lock sync.Mutex
+
+	// startBlock is the first block to fetch transactions from
+	startBlock uint64
+
+	// currentBlock tracks which block we're fetching next
+	currentBlock uint64
+
+	// chainID for transaction signing validation
+	chainID *big.Int
+
+	// addressNonce tracks the latest nonce for each address
+	addressNonce map[common.Address]uint64
+}
+
+// NewReplayMempool creates a new ReplayMempool that fetches transactions
+// from the given RPC endpoint starting from the specified block.
+func NewReplayMempool(log log.Logger, rpcURL string, startBlock uint64, chainID *big.Int) (*ReplayMempool, error) {
+	client, err := ethclient.Dial(rpcURL)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ReplayMempool{
+		log:          log,
+		client:       client,
+		startBlock:   startBlock,
+		currentBlock: startBlock,
+		chainID:      chainID,
+		addressNonce: make(map[common.Address]uint64),
+	}, nil
+}
+
+// AddTransactions is a no-op for ReplayMempool since transactions come from the source node.
+func (m *ReplayMempool) AddTransactions(_ []*types.Transaction) {
+	// No-op: transactions are fetched from the source node, not added manually
+}
+
+// NextBlock fetches the next block from the source node and returns its transactions.
+// Returns (mempoolTxs, sequencerTxs) where:
+// - mempoolTxs: regular transactions to be sent via eth_sendRawTransaction
+// - sequencerTxs: deposit transactions to be included in payload attributes
+func (m *ReplayMempool) NextBlock() ([][]byte, [][]byte) {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+
+	ctx := context.Background()
+
+	block, err := m.client.BlockByNumber(ctx, big.NewInt(int64(m.currentBlock)))
+	if err != nil {
+		m.log.Warn("Failed to fetch block", "block", m.currentBlock, "error", err)
+		return nil, nil
+	}
+
+	m.log.Info("Fetched block for replay",
+		"block", m.currentBlock,
+		"txs", len(block.Transactions()),
+		"gas_used", block.GasUsed(),
+	)
+
+	m.currentBlock++
+
+	mempoolTxs := make([][]byte, 0)
+	sequencerTxs := make([][]byte, 0)
+
+	for _, tx := range block.Transactions() {
+		// Track nonces for GetTransactionCount
+		from, err := types.Sender(types.NewIsthmusSigner(m.chainID), tx)
+		if err != nil {
+			// Try with London signer for older transactions
+			from, err = types.Sender(types.NewLondonSigner(m.chainID), tx)
+			if err != nil {
+				m.log.Warn("Failed to get sender", "tx", tx.Hash(), "error", err)
+				continue
+			}
+		}
+		m.addressNonce[from] = tx.Nonce()
+
+		txBytes, err := tx.MarshalBinary()
+		if err != nil {
+			m.log.Warn("Failed to marshal transaction", "tx", tx.Hash(), "error", err)
+			continue
+		}
+
+		// Deposit transactions go to sequencer, others go to mempool
+		if tx.Type() == types.DepositTxType {
+			sequencerTxs = append(sequencerTxs, txBytes)
+		} else {
+			mempoolTxs = append(mempoolTxs, txBytes)
+		}
+	}
+
+	return mempoolTxs, sequencerTxs
+}
+
+// GetTransactionCount returns the latest nonce for an address.
+func (m *ReplayMempool) GetTransactionCount(address common.Address) uint64 {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	return m.addressNonce[address]
+}
+
+// CurrentBlock returns the current block number being replayed.
+func (m *ReplayMempool) CurrentBlock() uint64 {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	return m.currentBlock
+}
+
+// Close closes the underlying RPC client connection.
+func (m *ReplayMempool) Close() {
+	m.client.Close()
+}
+
+var _ FakeMempool = &ReplayMempool{}
+

runner/network/network_benchmark.go

@@ -45,10 +45,11 @@ type NetworkBenchmark struct {
 
 	transactionPayload payload.Definition
 	ports              portmanager.PortManager
+	replayConfig       *benchmark.ReplayConfig
 }
 
 // NewNetworkBenchmark creates a new network benchmark and initializes the payload worker and consensus client
-func NewNetworkBenchmark(config *benchtypes.TestConfig, log log.Logger, sequencerOptions *config.InternalClientOptions, validatorOptions *config.InternalClientOptions, proofConfig *benchmark.ProofProgramOptions, transactionPayload payload.Definition, ports portmanager.PortManager) (*NetworkBenchmark, error) {
+func NewNetworkBenchmark(config *benchtypes.TestConfig, log log.Logger, sequencerOptions *config.InternalClientOptions, validatorOptions *config.InternalClientOptions, proofConfig *benchmark.ProofProgramOptions, transactionPayload payload.Definition, ports portmanager.PortManager, replayConfig *benchmark.ReplayConfig) (*NetworkBenchmark, error) {
 	return &NetworkBenchmark{
 		log:                log,
 		sequencerOptions:   sequencerOptions,
@@ -57,6 +58,7 @@ func NewNetworkBenchmark(config *benchtypes.TestConfig, log log.Logger, sequence
 		proofConfig:        proofConfig,
 		transactionPayload: transactionPayload,
 		ports:              ports,
+		replayConfig:       replayConfig,
 	}, nil
 }
 
@@ -107,15 +109,35 @@ func (nb *NetworkBenchmark) benchmarkSequencer(ctx context.Context, l1Chain *l1C
 		}
 	}()
 
-	benchmark := newSequencerBenchmark(nb.log, *nb.testConfig, sequencerClient, l1Chain, nb.transactionPayload)
-	executionData, lastBlock, err := benchmark.Run(ctx, metricsCollector)
+	var executionData []engine.ExecutableData
+	var lastBlock uint64
+
+	// Use replay benchmark if replay config is provided
+	if nb.replayConfig != nil {
+		nb.log.Info("Using replay sequencer benchmark",
+			"source_rpc", nb.replayConfig.SourceRPCURL,
+			"start_block", nb.replayConfig.StartBlock,
+		)
+		replayBenchmark := NewReplaySequencerBenchmark(
+			nb.log,
+			*nb.testConfig,
+			sequencerClient,
+			l1Chain,
+			nb.replayConfig.SourceRPCURL,
+			nb.replayConfig.StartBlock,
+		)
+		executionData, lastBlock, err = replayBenchmark.Run(ctx, metricsCollector)
+	} else {
+		benchmark := newSequencerBenchmark(nb.log, *nb.testConfig, sequencerClient, l1Chain, nb.transactionPayload)
+		executionData, lastBlock, err = benchmark.Run(ctx, metricsCollector)
+	}
 
 	if err != nil {
 		sequencerClient.Stop()
-		return nil, 0, nil, fmt.Errorf("failed to run sequencer benchmark: %w", err)
+		return nil, 0, nil, err
 	}
 
-	return executionData, lastBlock, sequencerClient, nil
+	return executionData, lastBlock, sequencerClient, err
 }
 
 func (nb *NetworkBenchmark) benchmarkValidator(ctx context.Context, payloads []engine.ExecutableData, lastSetupBlock uint64, l1Chain *l1Chain, sequencerClient types.ExecutionClient) error {