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https://github.com/ethereum/go-ethereum.git
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96 lines
3.4 KiB
Go
96 lines
3.4 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/scroll-tech/go-ethereum/core/types"
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"github.com/scroll-tech/go-ethereum/params"
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)
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// Protocol-enforced maximum L2 base fee.
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// We would only go above this if L1 base fee hits 2931 Gwei.
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const MaximumL2BaseFee = 10000000000
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// L2 base fee formula constants and defaults.
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// l2BaseFee = (l1BaseFee * scalar) / PRECISION + overhead.
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// `scalar` accounts for finalization costs. `overhead` accounts for sequencing and proving costs.
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// we use 1e18 for precision to match the contract implementation.
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var (
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BaseFeePrecision = new(big.Int).SetUint64(1e18)
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DefaultBaseFeeScalar = new(big.Int).SetUint64(34000000000000)
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DefaultBaseFeeOverhead = new(big.Int).SetUint64(15680000)
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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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if err := VerifyGaslimit(parent.GasLimit, 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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// note: we do not verify L2 base fee, the sequencer has the
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// right to set any base fee below the maximum. L2 base fee
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// is not subject to L2 consensus or zk verification.
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if header.BaseFee.Cmp(big.NewInt(MaximumL2BaseFee)) > 0 {
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return fmt.Errorf("invalid baseFee: have %s, maximum %d", header.BaseFee, MaximumL2BaseFee)
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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, parentL1BaseFee *big.Int) *big.Int {
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if config.Clique != nil && config.Clique.ShadowForkHeight != 0 && parent.Number.Uint64() >= config.Clique.ShadowForkHeight {
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return big.NewInt(10000000) // 0.01 Gwei
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}
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scalar := config.Scroll.BaseFeeScalar
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if scalar == nil {
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scalar = DefaultBaseFeeScalar
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}
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overhead := config.Scroll.BaseFeeOverhead
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if overhead == nil {
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overhead = DefaultBaseFeeOverhead
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}
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return calcBaseFee(scalar, overhead, parentL1BaseFee)
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}
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// MinBaseFee calculates the minimum L2 base fee based on the configured coefficients.
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func MinBaseFee(scalar, overhead *big.Int) *big.Int {
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return calcBaseFee(scalar, overhead, big.NewInt(0))
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}
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func calcBaseFee(scalar, overhead, parentL1BaseFee *big.Int) *big.Int {
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baseFee := new(big.Int).Set(parentL1BaseFee)
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baseFee.Mul(baseFee, scalar)
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baseFee.Div(baseFee, BaseFeePrecision)
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baseFee.Add(baseFee, overhead)
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if baseFee.Cmp(big.NewInt(MaximumL2BaseFee)) > 0 {
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baseFee = big.NewInt(MaximumL2BaseFee)
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}
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return baseFee
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}
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