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abci.go
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abci.go
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// Copyright 2021 Evmos Foundation
// This file is part of Evmos' Ethermint library.
//
// The Ethermint library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Ethermint library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Ethermint library. If not, see https://github.com/airchains-network/rollup-evm/blob/main/LICENSE
package keeper
import (
"fmt"
"github.com/airchains-network/rollup-evm/x/feemarket/types"
abci "github.com/tendermint/tendermint/abci/types"
"github.com/cosmos/cosmos-sdk/telemetry"
sdk "github.com/cosmos/cosmos-sdk/types"
)
// BeginBlock updates base fee
func (k *Keeper) BeginBlock(ctx sdk.Context, _ abci.RequestBeginBlock) {
baseFee := k.CalculateBaseFee(ctx)
// return immediately if base fee is nil
if baseFee == nil {
return
}
k.SetBaseFee(ctx, baseFee)
defer func() {
telemetry.SetGauge(float32(baseFee.Int64()), "feemarket", "base_fee")
}()
// Store current base fee in event
ctx.EventManager().EmitEvents(sdk.Events{
sdk.NewEvent(
types.EventTypeFeeMarket,
sdk.NewAttribute(types.AttributeKeyBaseFee, baseFee.String()),
),
})
}
// EndBlock update block gas wanted.
// The EVM end block logic doesn't update the validator set, thus it returns
// an empty slice.
func (k *Keeper) EndBlock(ctx sdk.Context, _ abci.RequestEndBlock) {
if ctx.BlockGasMeter() == nil {
k.Logger(ctx).Error("block gas meter is nil when setting block gas wanted")
return
}
gasWanted := k.GetTransientGasWanted(ctx)
gasUsed := ctx.BlockGasMeter().GasConsumedToLimit()
// to prevent BaseFee manipulation we limit the gasWanted so that
// gasWanted = max(gasWanted * MinGasMultiplier, gasUsed)
// this will be keep BaseFee protected from un-penalized manipulation
// more info here https://github.com/airchains-network/rollup-evm/pull/1105#discussion_r888798925
minGasMultiplier := k.GetParams(ctx).MinGasMultiplier
limitedGasWanted := sdk.NewDec(int64(gasWanted)).Mul(minGasMultiplier)
gasWanted = sdk.MaxDec(limitedGasWanted, sdk.NewDec(int64(gasUsed))).TruncateInt().Uint64()
k.SetBlockGasWanted(ctx, gasWanted)
defer func() {
telemetry.SetGauge(float32(gasWanted), "feemarket", "block_gas")
}()
ctx.EventManager().EmitEvent(sdk.NewEvent(
"block_gas",
sdk.NewAttribute("height", fmt.Sprintf("%d", ctx.BlockHeight())),
sdk.NewAttribute("amount", fmt.Sprintf("%d", gasWanted)),
))
}