a51188a163
This PR changes geth to read the eip1559 params from the chain config instead of the globals. This way the parameters may be changed by forking the chain config code, without creating a large diff throughout the past and future usages of the parameters. Co-authored-by: Martin Holst Swende <martin@swende.se>
94 lines
3.5 KiB
Go
94 lines
3.5 KiB
Go
// Copyright 2021 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package misc
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/params"
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)
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// VerifyEip1559Header verifies some header attributes which were changed in EIP-1559,
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// - gas limit check
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// - basefee check
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func VerifyEip1559Header(config *params.ChainConfig, parent, header *types.Header) error {
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// Verify that the gas limit remains within allowed bounds
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parentGasLimit := parent.GasLimit
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if !config.IsLondon(parent.Number) {
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parentGasLimit = parent.GasLimit * config.ElasticityMultiplier()
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}
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if err := VerifyGaslimit(parentGasLimit, header.GasLimit); err != nil {
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return err
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}
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// Verify the header is not malformed
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if header.BaseFee == nil {
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return fmt.Errorf("header is missing baseFee")
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}
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// Verify the baseFee is correct based on the parent header.
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expectedBaseFee := CalcBaseFee(config, parent)
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if header.BaseFee.Cmp(expectedBaseFee) != 0 {
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return fmt.Errorf("invalid baseFee: have %s, want %s, parentBaseFee %s, parentGasUsed %d",
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header.BaseFee, expectedBaseFee, parent.BaseFee, parent.GasUsed)
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}
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return nil
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}
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// CalcBaseFee calculates the basefee of the header.
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func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
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// If the current block is the first EIP-1559 block, return the InitialBaseFee.
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if !config.IsLondon(parent.Number) {
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return new(big.Int).SetUint64(params.InitialBaseFee)
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}
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parentGasTarget := parent.GasLimit / config.ElasticityMultiplier()
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// If the parent gasUsed is the same as the target, the baseFee remains unchanged.
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if parent.GasUsed == parentGasTarget {
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return new(big.Int).Set(parent.BaseFee)
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}
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var (
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num = new(big.Int)
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denom = new(big.Int)
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)
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if parent.GasUsed > parentGasTarget {
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// If the parent block used more gas than its target, the baseFee should increase.
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// max(1, parentBaseFee * gasUsedDelta / parentGasTarget / baseFeeChangeDenominator)
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num.SetUint64(parent.GasUsed - parentGasTarget)
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num.Mul(num, parent.BaseFee)
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num.Div(num, denom.SetUint64(parentGasTarget))
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num.Div(num, denom.SetUint64(config.BaseFeeChangeDenominator()))
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baseFeeDelta := math.BigMax(num, common.Big1)
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return num.Add(parent.BaseFee, baseFeeDelta)
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} else {
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// Otherwise if the parent block used less gas than its target, the baseFee should decrease.
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// max(0, parentBaseFee * gasUsedDelta / parentGasTarget / baseFeeChangeDenominator)
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num.SetUint64(parentGasTarget - parent.GasUsed)
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num.Mul(num, parent.BaseFee)
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num.Div(num, denom.SetUint64(parentGasTarget))
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num.Div(num, denom.SetUint64(config.BaseFeeChangeDenominator()))
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baseFee := num.Sub(parent.BaseFee, num)
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return math.BigMax(baseFee, common.Big0)
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}
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}
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