Merge pull request #2358 from ethereum-optimism/feat/gpo-configurable-base-fee-poll-interval

gas-oracle: allow configurable base fee poll interval

.changeset/thirty-stingrays-reply.md

+---
+'@eth-optimism/gas-oracle': patch
+---
+
+Allow configurable base fee update poll time with `GAS_PRICE_ORACLE_L1_BASE_FEE_EPOCH_LENGTH_SECONDS`

go/gas-oracle/flags/flags.go

@@ -89,6 +89,12 @@ var (
 		Usage:  "length of epochs in seconds",
 		EnvVar: "GAS_PRICE_ORACLE_EPOCH_LENGTH_SECONDS",
 	}
+	L1BaseFeeEpochLengthSecondsFlag = cli.Uint64Flag{
+		Name:   "l1-base-fee-epoch-length-seconds",
+		Value:  15,
+		Usage:  "polling time for updating the L1 base fee",
+		EnvVar: "GAS_PRICE_ORACLE_L1_BASE_FEE_EPOCH_LENGTH_SECONDS",
+	}
 	L1BaseFeeSignificanceFactorFlag = cli.Float64Flag{
 		Name:   "l1-base-fee-significant-factor",
 		Value:  0.10,
@@ -169,6 +175,7 @@ var Flags = []cli.Flag{
 	MaxPercentChangePerEpochFlag,
 	AverageBlockGasLimitPerEpochFlag,
 	EpochLengthSecondsFlag,
+	L1BaseFeeEpochLengthSecondsFlag,
 	L2GasPriceSignificanceFactorFlag,
 	WaitForReceiptFlag,
 	EnableL1BaseFeeFlag,

go/gas-oracle/oracle/config.go

@@ -28,6 +28,7 @@ type Config struct {
 	maxPercentChangePerEpoch     float64
 	averageBlockGasLimitPerEpoch uint64
 	epochLengthSeconds           uint64
+	l1BaseFeeEpochLengthSeconds  uint64
 	l2GasPriceSignificanceFactor float64
 	l1BaseFeeSignificanceFactor  float64
 	enableL1BaseFee              bool
@@ -54,6 +55,7 @@ func NewConfig(ctx *cli.Context) *Config {
 	cfg.maxPercentChangePerEpoch = ctx.GlobalFloat64(flags.MaxPercentChangePerEpochFlag.Name)
 	cfg.averageBlockGasLimitPerEpoch = ctx.GlobalUint64(flags.AverageBlockGasLimitPerEpochFlag.Name)
 	cfg.epochLengthSeconds = ctx.GlobalUint64(flags.EpochLengthSecondsFlag.Name)
+	cfg.l1BaseFeeEpochLengthSeconds = ctx.GlobalUint64(flags.L1BaseFeeEpochLengthSecondsFlag.Name)
 	cfg.l2GasPriceSignificanceFactor = ctx.GlobalFloat64(flags.L2GasPriceSignificanceFactorFlag.Name)
 	cfg.floorPrice = ctx.GlobalUint64(flags.FloorPriceFlag.Name)
 	cfg.l1BaseFeeSignificanceFactor = ctx.GlobalFloat64(flags.L1BaseFeeSignificanceFactorFlag.Name)

go/gas-oracle/oracle/gas_price_oracle.go

@@ -111,6 +111,7 @@ func (g *GasPriceOracle) ensure() error {
 func (g *GasPriceOracle) Loop() {
 	timer := time.NewTicker(time.Duration(g.config.epochLengthSeconds) * time.Second)
 	defer timer.Stop()
+
 	for {
 		select {
 		case <-timer.C:
@@ -126,7 +127,7 @@ func (g *GasPriceOracle) Loop() {
 }
 
 func (g *GasPriceOracle) BaseFeeLoop() {
-	timer := time.NewTicker(15 * time.Second)
+	timer := time.NewTicker(time.Duration(g.config.l1BaseFeeEpochLengthSeconds) * time.Second)
 	defer timer.Stop()
 
 	updateBaseFee, err := wrapUpdateBaseFee(g.l1Backend, g.l2Backend, g.config)