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driver.go
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driver.go
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package sequencer
import (
"context"
"crypto/ecdsa"
"fmt"
"math/big"
"strings"
"github.com/ethereum-optimism/optimism/batch-submitter/bindings/ctc"
"github.com/ethereum-optimism/optimism/bss-core/drivers"
"github.com/ethereum-optimism/optimism/bss-core/metrics"
"github.com/ethereum-optimism/optimism/bss-core/txmgr"
l2ethclient "github.com/ethereum-optimism/optimism/l2geth/ethclient"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/log"
)
const (
appendSequencerBatchMethodName = "appendSequencerBatch"
)
var bigOne = new(big.Int).SetUint64(1)
type Config struct {
Name string
L1Client *ethclient.Client
L2Client *l2ethclient.Client
BlockOffset uint64
MinTxSize uint64
MaxTxSize uint64
MaxPlaintextBatchSize uint64
CTCAddr common.Address
ChainID *big.Int
PrivKey *ecdsa.PrivateKey
BatchType BatchType
}
type Driver struct {
cfg Config
ctcContract *ctc.CanonicalTransactionChain
rawCtcContract *bind.BoundContract
walletAddr common.Address
ctcABI *abi.ABI
metrics *Metrics
}
func NewDriver(cfg Config) (*Driver, error) {
ctcContract, err := ctc.NewCanonicalTransactionChain(
cfg.CTCAddr, cfg.L1Client,
)
if err != nil {
return nil, err
}
parsed, err := abi.JSON(strings.NewReader(
ctc.CanonicalTransactionChainABI,
))
if err != nil {
return nil, err
}
ctcABI, err := ctc.CanonicalTransactionChainMetaData.GetAbi()
if err != nil {
return nil, err
}
rawCtcContract := bind.NewBoundContract(
cfg.CTCAddr, parsed, cfg.L1Client, cfg.L1Client,
cfg.L1Client,
)
walletAddr := crypto.PubkeyToAddress(cfg.PrivKey.PublicKey)
return &Driver{
cfg: cfg,
ctcContract: ctcContract,
rawCtcContract: rawCtcContract,
walletAddr: walletAddr,
ctcABI: ctcABI,
metrics: NewMetrics(cfg.Name),
}, nil
}
// Name is an identifier used to prefix logs for a particular service.
func (d *Driver) Name() string {
return d.cfg.Name
}
// WalletAddr is the wallet address used to pay for batch transaction fees.
func (d *Driver) WalletAddr() common.Address {
return d.walletAddr
}
// Metrics returns the subservice telemetry object.
func (d *Driver) Metrics() metrics.Metrics {
return d.metrics
}
// ClearPendingTx a publishes a transaction at the next available nonce in order
// to clear any transactions in the mempool left over from a prior running
// instance of the batch submitter.
func (d *Driver) ClearPendingTx(
ctx context.Context,
txMgr txmgr.TxManager,
l1Client *ethclient.Client,
) error {
return drivers.ClearPendingTx(
d.cfg.Name, ctx, txMgr, l1Client, d.walletAddr, d.cfg.PrivKey,
d.cfg.ChainID,
)
}
// GetBatchBlockRange returns the start and end L2 block heights that need to be
// processed. Note that the end value is *exclusive*, therefore if the returned
// values are identical nothing needs to be processed.
func (d *Driver) GetBatchBlockRange(
ctx context.Context) (*big.Int, *big.Int, error) {
blockOffset := new(big.Int).SetUint64(d.cfg.BlockOffset)
start, err := d.ctcContract.GetTotalElements(&bind.CallOpts{
Pending: false,
Context: ctx,
})
if err != nil {
return nil, nil, err
}
start.Add(start, blockOffset)
latestHeader, err := d.cfg.L2Client.HeaderByNumber(ctx, nil)
if err != nil {
return nil, nil, err
}
// Add one because end is *exclusive*.
end := new(big.Int).Add(latestHeader.Number, bigOne)
if start.Cmp(end) > 0 {
return nil, nil, fmt.Errorf("invalid range, "+
"end(%v) < start(%v)", end, start)
}
return start, end, nil
}
// CraftBatchTx transforms the L2 blocks between start and end into a batch
// transaction using the given nonce. A dummy gas price is used in the resulting
// transaction to use for size estimation. A nil transaction is returned if the
// transaction does not meet the minimum size requirements.
//
// NOTE: This method SHOULD NOT publish the resulting transaction.
func (d *Driver) CraftBatchTx(
ctx context.Context,
start, end, nonce *big.Int,
) (*types.Transaction, error) {
name := d.cfg.Name
log.Info(name+" crafting batch tx", "start", start, "end", end,
"nonce", nonce, "type", d.cfg.BatchType.String())
var (
batchElements []BatchElement
totalTxSize uint64
hasLargeNextTx bool
)
for i := new(big.Int).Set(start); i.Cmp(end) < 0; i.Add(i, bigOne) {
block, err := d.cfg.L2Client.BlockByNumber(ctx, i)
if err != nil {
return nil, err
}
// For each sequencer transaction, update our running total with the
// size of the transaction.
batchElement := BatchElementFromBlock(block)
if batchElement.IsSequencerTx() {
// Abort once the total size estimate is greater than the maximum
// configured size. This is a conservative estimate, as the total
// calldata size will be greater when batch contexts are included.
// Below this set will be further whittled until the raw call data
// size also adheres to this constraint.
txLen := batchElement.Tx.Size()
if totalTxSize+uint64(TxLenSize+txLen) > d.cfg.MaxPlaintextBatchSize {
// Adding this transaction causes the batch to be too large, but
// we also record if the batch size without the transaction
// fails to meet our minimum size constraint. This is used below
// to determine whether or not to ignore the minimum size check,
// since in this case it can't be avoided.
hasLargeNextTx = totalTxSize < d.cfg.MinTxSize
break
}
totalTxSize += uint64(TxLenSize + txLen)
}
batchElements = append(batchElements, batchElement)
}
shouldStartAt := start.Uint64()
var pruneCount int
for {
batchParams, err := GenSequencerBatchParams(
shouldStartAt, d.cfg.BlockOffset, batchElements,
)
if err != nil {
return nil, err
}
// Encode the batch arguments using the configured encoding type.
batchArguments, err := batchParams.Serialize(d.cfg.BatchType)
if err != nil {
return nil, err
}
appendSequencerBatchID := d.ctcABI.Methods[appendSequencerBatchMethodName].ID
calldata := append(appendSequencerBatchID, batchArguments...)
log.Info(name+" testing batch size",
"calldata_size", len(calldata),
"min_tx_size", d.cfg.MinTxSize,
"max_tx_size", d.cfg.MaxTxSize)
// Continue pruning until plaintext calldata size is less than
// configured max.
calldataSize := uint64(len(calldata))
if calldataSize > d.cfg.MaxTxSize {
oldLen := len(batchElements)
newBatchElementsLen := (oldLen * 9) / 10
batchElements = batchElements[:newBatchElementsLen]
log.Info(name+" pruned batch",
"old_num_txs", oldLen,
"new_num_txs", newBatchElementsLen)
pruneCount++
continue
}
// There are two specific cases in which we choose to ignore the minimum
// L1 tx size. These cases are permitted since they arise from
// situations where the difference between the configured MinTxSize and
// MaxTxSize is less than the maximum L2 tx size permitted by the
// mempool.
//
// This configuration is useful when trying to ensure the profitability
// is sufficient, and we permit batches to be submitted with less than
// our desired configuration only if it is not possible to construct a
// batch within the given parameters.
//
// The two cases are:
// 1. When the next elenent is larger than the difference between the
// min and the max, causing the batch to be too small without the
// element, and too large with it.
// 2. When pruning a batch that exceeds the mac size below, and then
// becomes too small as a result. This is avoided by only applying
// the min size check when the pruneCount is zero.
ignoreMinTxSize := pruneCount > 0 || hasLargeNextTx
if !ignoreMinTxSize && calldataSize < d.cfg.MinTxSize {
log.Info(name+" batch tx size below minimum",
"num_txs", len(batchElements))
return nil, nil
}
d.metrics.NumElementsPerBatch().Observe(float64(len(batchElements)))
d.metrics.BatchPruneCount.Set(float64(pruneCount))
log.Info(name+" batch constructed",
"num_txs", len(batchElements),
"final_size", len(calldata),
"batch_type", d.cfg.BatchType)
opts, err := bind.NewKeyedTransactorWithChainID(
d.cfg.PrivKey, d.cfg.ChainID,
)
if err != nil {
return nil, err
}
opts.Context = ctx
opts.Nonce = nonce
opts.NoSend = true
tx, err := d.rawCtcContract.RawTransact(opts, calldata)
switch {
case err == nil:
return tx, nil
// If the transaction failed because the backend does not support
// eth_maxPriorityFeePerGas, fallback to using the default constant.
// Currently Alchemy is the only backend provider that exposes this
// method, so in the event their API is unreachable we can fallback to a
// degraded mode of operation. This also applies to our test
// environments, as hardhat doesn't support the query either.
case drivers.IsMaxPriorityFeePerGasNotFoundError(err):
log.Warn(d.cfg.Name + " eth_maxPriorityFeePerGas is unsupported " +
"by current backend, using fallback gasTipCap")
opts.GasTipCap = drivers.FallbackGasTipCap
return d.rawCtcContract.RawTransact(opts, calldata)
default:
return nil, err
}
}
}
// UpdateGasPrice signs an otherwise identical txn to the one provided but with
// updated gas prices sampled from the existing network conditions.
//
// NOTE: Thie method SHOULD NOT publish the resulting transaction.
func (d *Driver) UpdateGasPrice(
ctx context.Context,
tx *types.Transaction,
) (*types.Transaction, error) {
gasTipCap, err := d.cfg.L1Client.SuggestGasTipCap(ctx)
if err != nil {
// If the transaction failed because the backend does not support
// eth_maxPriorityFeePerGas, fallback to using the default constant.
// Currently Alchemy is the only backend provider that exposes this
// method, so in the event their API is unreachable we can fallback to a
// degraded mode of operation. This also applies to our test
// environments, as hardhat doesn't support the query either.
if !drivers.IsMaxPriorityFeePerGasNotFoundError(err) {
return nil, err
}
log.Warn(d.cfg.Name + " eth_maxPriorityFeePerGas is unsupported " +
"by current backend, using fallback gasTipCap")
gasTipCap = drivers.FallbackGasTipCap
}
header, err := d.cfg.L1Client.HeaderByNumber(ctx, nil)
if err != nil {
return nil, err
}
gasFeeCap := txmgr.CalcGasFeeCap(header.BaseFee, gasTipCap)
// The estimated gas limits performed by RawTransact fail semi-regularly
// with out of gas exceptions. To remedy this we extract the internal calls
// to perform gas price/gas limit estimation here and add a buffer to
// account for any network variability.
gasLimit, err := d.cfg.L1Client.EstimateGas(ctx, ethereum.CallMsg{
From: d.walletAddr,
To: &d.cfg.CTCAddr,
GasPrice: nil,
GasTipCap: gasTipCap,
GasFeeCap: gasFeeCap,
Value: nil,
Data: tx.Data(),
})
if err != nil {
return nil, err
}
opts, err := bind.NewKeyedTransactorWithChainID(
d.cfg.PrivKey, d.cfg.ChainID,
)
if err != nil {
return nil, err
}
opts.Context = ctx
opts.Nonce = new(big.Int).SetUint64(tx.Nonce())
opts.GasTipCap = gasTipCap
opts.GasFeeCap = gasFeeCap
opts.GasLimit = 6 * gasLimit / 5 // add 20% buffer to gas limit
opts.NoSend = true
return d.rawCtcContract.RawTransact(opts, tx.Data())
}
// SendTransaction injects a signed transaction into the pending pool for
// execution.
func (d *Driver) SendTransaction(
ctx context.Context,
tx *types.Transaction,
) error {
return d.cfg.L1Client.SendTransaction(ctx, tx)
}