Merge pull request #2291 from cfromknecht/bss-gas-estimation-limit

feat: extract gas limit estimation to driver, add 20% buffer

.changeset/fair-bees-promise.md

+---
+'@eth-optimism/batch-submitter-service': patch
+---
+
+Add 20% buffer to gas estimation on tx-batch submission to prevent OOG reverts

go/batch-submitter/drivers/sequencer/driver.go

@@ -12,6 +12,7 @@ import (
 	"github.com/ethereum-optimism/optimism/go/bss-core/metrics"
 	"github.com/ethereum-optimism/optimism/go/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"
@@ -274,6 +275,46 @@ func (d *Driver) UpdateGasPrice(
 	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,
 	)
@@ -282,28 +323,12 @@ func (d *Driver) UpdateGasPrice(
 	}
 	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
 
-	finalTx, err := d.rawCtcContract.RawTransact(opts, tx.Data())
-	switch {
-	case err == nil:
-		return finalTx, 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, tx.Data())
-
-	default:
-		return nil, err
-	}
+	return d.rawCtcContract.RawTransact(opts, tx.Data())
 }
 
 // SendTransaction injects a signed transaction into the pending pool for