mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-22 11:41:19 +00:00
190bc9dfd8
Implement https://github.com/ethereum/EIPs/pull/7062 and https://github.com/ethereum/EIPs/pull/7095. Pick up https://github.com/ledgerwatch/erigon-lib/pull/1006.
101 lines
3.5 KiB
Go
101 lines
3.5 KiB
Go
// Copyright 2021 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package misc
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/holiman/uint256"
|
|
"github.com/ledgerwatch/erigon-lib/chain"
|
|
|
|
"github.com/ledgerwatch/erigon/core/types"
|
|
"github.com/ledgerwatch/erigon/params"
|
|
)
|
|
|
|
// CalcExcessDataGas implements calc_excess_data_gas from EIP-4844
|
|
func CalcExcessDataGas(parent *types.Header) uint64 {
|
|
var excessDataGas, dataGasUsed uint64
|
|
if parent.ExcessDataGas != nil {
|
|
excessDataGas = *parent.ExcessDataGas
|
|
}
|
|
if parent.DataGasUsed != nil {
|
|
dataGasUsed = *parent.DataGasUsed
|
|
}
|
|
|
|
if excessDataGas+dataGasUsed < params.TargetDataGasPerBlock {
|
|
return 0
|
|
}
|
|
return excessDataGas + dataGasUsed - params.TargetDataGasPerBlock
|
|
}
|
|
|
|
// FakeExponential approximates factor * e ** (num / denom) using a taylor expansion
|
|
// as described in the EIP-4844 spec.
|
|
func FakeExponential(factor, denom *uint256.Int, excessDataGas uint64) (*uint256.Int, error) {
|
|
numerator := uint256.NewInt(excessDataGas)
|
|
output := uint256.NewInt(0)
|
|
numeratorAccum := new(uint256.Int)
|
|
_, overflow := numeratorAccum.MulOverflow(factor, denom)
|
|
if overflow {
|
|
return nil, fmt.Errorf("FakeExponential: overflow in MulOverflow(factor=%v, denom=%v)", factor, denom)
|
|
}
|
|
divisor := new(uint256.Int)
|
|
for i := 1; numeratorAccum.Sign() > 0; i++ {
|
|
_, overflow = output.AddOverflow(output, numeratorAccum)
|
|
if overflow {
|
|
return nil, fmt.Errorf("FakeExponential: overflow in AddOverflow(output=%v, numeratorAccum=%v)", output, numeratorAccum)
|
|
}
|
|
_, overflow = divisor.MulOverflow(denom, uint256.NewInt(uint64(i)))
|
|
if overflow {
|
|
return nil, fmt.Errorf("FakeExponential: overflow in MulOverflow(denom=%v, i=%v)", denom, i)
|
|
}
|
|
_, overflow = numeratorAccum.MulDivOverflow(numeratorAccum, numerator, divisor)
|
|
if overflow {
|
|
return nil, fmt.Errorf("FakeExponential: overflow in MulDivOverflow(numeratorAccum=%v, numerator=%v, divisor=%v)", numeratorAccum, numerator, divisor)
|
|
}
|
|
}
|
|
return output.Div(output, denom), nil
|
|
}
|
|
|
|
// CountBlobs returns the number of blob transactions in txs
|
|
func CountBlobs(txs []types.Transaction) int {
|
|
var count int
|
|
for _, tx := range txs {
|
|
count += len(tx.GetDataHashes())
|
|
}
|
|
return count
|
|
}
|
|
|
|
// VerifyEip4844Header verifies that the header is not malformed
|
|
func VerifyEip4844Header(config *chain.Config, parent, header *types.Header) error {
|
|
if header.DataGasUsed == nil {
|
|
return fmt.Errorf("header is missing dataGasUsed")
|
|
}
|
|
if header.ExcessDataGas == nil {
|
|
return fmt.Errorf("header is missing excessDataGas")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// GetDataGasPrice implements get_data_gas_price from EIP-4844
|
|
func GetDataGasPrice(excessDataGas uint64) (*uint256.Int, error) {
|
|
return FakeExponential(uint256.NewInt(params.MinDataGasPrice), uint256.NewInt(params.DataGasPriceUpdateFraction), excessDataGas)
|
|
}
|
|
|
|
func GetDataGasUsed(numBlobs int) uint64 {
|
|
return uint64(numBlobs) * params.DataGasPerBlob
|
|
}
|