feat: add GasPriceFromGwei helper in utils package

go/batch-submitter/batch_submitter.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"crypto/ecdsa"
 	"fmt"
-	"math/big"
 	"net/http"
 	"os"
 	"strconv"
@@ -13,6 +12,7 @@ import (
 	"github.com/ethereum-optimism/optimism/go/batch-submitter/drivers/proposer"
 	"github.com/ethereum-optimism/optimism/go/batch-submitter/drivers/sequencer"
 	"github.com/ethereum-optimism/optimism/go/batch-submitter/txmgr"
+	"github.com/ethereum-optimism/optimism/go/batch-submitter/utils"
 	l2ethclient "github.com/ethereum-optimism/optimism/l2geth/ethclient"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -159,9 +159,9 @@ func NewBatchSubmitter(cfg Config, gitVersion string) (*BatchSubmitter, error) {
 	}
 
 	txManagerConfig := txmgr.Config{
-		MinGasPrice:          gasPriceFromGwei(1),
-		MaxGasPrice:          gasPriceFromGwei(cfg.MaxGasPriceInGwei),
-		GasRetryIncrement:    gasPriceFromGwei(cfg.GasRetryIncrement),
+		MinGasPrice:          utils.GasPriceFromGwei(1),
+		MaxGasPrice:          utils.GasPriceFromGwei(cfg.MaxGasPriceInGwei),
+		GasRetryIncrement:    utils.GasPriceFromGwei(cfg.GasRetryIncrement),
 		ResubmissionTimeout:  cfg.ResubmissionTimeout,
 		ReceiptQueryInterval: time.Second,
 	}
@@ -333,7 +333,3 @@ func traceRateToFloat64(rate time.Duration) float64 {
 	}
 	return rate64
 }
-
-func gasPriceFromGwei(gasPriceInGwei uint64) *big.Int {
-	return new(big.Int).SetUint64(gasPriceInGwei * 1e9)
-}

go/batch-submitter/utils/gas_price.go

+package utils
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/params"
+)
+
+// GasPriceFromGwei converts an uint64 gas price in gwei to a big.Int in wei.
+func GasPriceFromGwei(gasPriceInGwei uint64) *big.Int {
+	return new(big.Int).SetUint64(gasPriceInGwei * params.GWei)
+}

go/batch-submitter/utils/gas_price_test.go

+package utils_test
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/go/batch-submitter/utils"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/stretchr/testify/require"
+)
+
+// TestGasPriceFromGwei asserts that the integer value is scaled properly by
+// 10^9.
+func TestGasPriceFromGwei(t *testing.T) {
+	require.Equal(t, utils.GasPriceFromGwei(0), new(big.Int))
+	require.Equal(t, utils.GasPriceFromGwei(1), big.NewInt(params.GWei))
+	require.Equal(t, utils.GasPriceFromGwei(100), big.NewInt(100*params.GWei))
+}