gas-oracle: fix type usage

Convert the average block gas limit to a `uint64` in the
codebase instead of it being used as a `float64`.

go/gas-oracle/gasprices/gas_price_updater.go

@@ -16,7 +16,7 @@ type GasPriceUpdater struct {
 	mu                     *sync.RWMutex
 	gasPricer              *GasPricer
 	epochStartBlockNumber  uint64
-	averageBlockGasLimit   float64
+	averageBlockGasLimit   uint64
 	epochLengthSeconds     uint64
 	getLatestBlockNumberFn GetLatestBlockNumberFn
 	getGasUsedByBlockFn    GetGasUsedByBlockFn
@@ -26,7 +26,7 @@ type GasPriceUpdater struct {
 func NewGasPriceUpdater(
 	gasPricer *GasPricer,
 	epochStartBlockNumber uint64,
-	averageBlockGasLimit float64,
+	averageBlockGasLimit uint64,
 	epochLengthSeconds uint64,
 	getLatestBlockNumberFn GetLatestBlockNumberFn,
 	getGasUsedByBlockFn GetGasUsedByBlockFn,

go/gas-oracle/gasprices/gas_price_updater_test.go

@@ -16,7 +16,7 @@ func makeTestGasPricerAndUpdater(curPrice uint64) (*GasPricer, *GasPriceUpdater,
 	gpsTarget := 3300000.0
 	getGasTarget := func() float64 { return gpsTarget }
 	epochLengthSeconds := uint64(10)
-	averageBlockGasLimit := 11000000.0
+	averageBlockGasLimit := uint64(11000000)
 	// Based on our 10 second epoch, we are targetting 3 blocks per epoch.
 	gasPricer, err := NewGasPricer(curPrice, 1, getGasTarget, 10)
 	if err != nil {
@@ -33,7 +33,7 @@ func makeTestGasPricerAndUpdater(curPrice uint64) (*GasPricer, *GasPriceUpdater,
 	// This is paramaterized based on 3 blocks per epoch, where each uses
 	// the average block gas limit plus an additional bit of gas added
 	getGasUsedByBlockFn := func(number *big.Int) (uint64, error) {
-		return uint64(averageBlockGasLimit)*3/epochLengthSeconds + 1, nil
+		return averageBlockGasLimit*3/epochLengthSeconds + 1, nil
 	}
 
 	startBlock, _ := getLatestBlockNumber()

go/gas-oracle/oracle/config.go

@@ -26,7 +26,7 @@ type Config struct {
 	floorPrice                   uint64
 	targetGasPerSecond           uint64
 	maxPercentChangePerEpoch     float64
-	averageBlockGasLimitPerEpoch float64
+	averageBlockGasLimitPerEpoch uint64
 	epochLengthSeconds           uint64
 	l2GasPriceSignificanceFactor float64
 	l1BaseFeeSignificanceFactor  float64
@@ -52,7 +52,7 @@ func NewConfig(ctx *cli.Context) *Config {
 	cfg.gasPriceOracleAddress = common.HexToAddress(addr)
 	cfg.targetGasPerSecond = ctx.GlobalUint64(flags.TargetGasPerSecondFlag.Name)
 	cfg.maxPercentChangePerEpoch = ctx.GlobalFloat64(flags.MaxPercentChangePerEpochFlag.Name)
-	cfg.averageBlockGasLimitPerEpoch = ctx.GlobalFloat64(flags.AverageBlockGasLimitPerEpochFlag.Name)
+	cfg.averageBlockGasLimitPerEpoch = ctx.GlobalUint64(flags.AverageBlockGasLimitPerEpochFlag.Name)
 	cfg.epochLengthSeconds = ctx.GlobalUint64(flags.EpochLengthSecondsFlag.Name)
 	cfg.l2GasPriceSignificanceFactor = ctx.GlobalFloat64(flags.L2GasPriceSignificanceFactorFlag.Name)
 	cfg.floorPrice = ctx.GlobalUint64(flags.FloorPriceFlag.Name)