mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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36e70c545b
Logic to compute fees for data blobs as well as additional check that verifies if user was willing to pay the current `data_gas` price. Updated `FakeExponential` function to work with uint256.
103 lines
3.7 KiB
Go
103 lines
3.7 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/holiman/uint256"
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"github.com/ledgerwatch/erigon-lib/chain"
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"github.com/ledgerwatch/erigon/core/types"
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"github.com/ledgerwatch/erigon/params"
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)
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// CalcExcessDataGas implements calc_excess_data_gas from EIP-4844
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func CalcExcessDataGas(parentExcessDataGas *big.Int, newBlobs int) *big.Int {
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excessDataGas := new(big.Int)
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if parentExcessDataGas != nil {
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excessDataGas.Set(parentExcessDataGas)
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}
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consumedGas := big.NewInt(params.DataGasPerBlob)
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consumedGas.Mul(consumedGas, big.NewInt(int64(newBlobs)))
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excessDataGas.Add(excessDataGas, consumedGas)
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targetGas := big.NewInt(params.TargetDataGasPerBlock)
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if excessDataGas.Cmp(targetGas) < 0 {
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return new(big.Int)
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}
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return new(big.Int).Set(excessDataGas.Sub(excessDataGas, targetGas))
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}
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// FakeExponential approximates factor * e ** (num / denom) using a taylor expansion
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// as described in the EIP-4844 spec.
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func FakeExponential(factor, denom *uint256.Int, edg *big.Int) (*uint256.Int, error) {
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numerator, overflow := uint256.FromBig(edg)
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if overflow {
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return nil, fmt.Errorf("FakeExponential: overflow converting excessDataGas: %v", edg)
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}
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output := uint256.NewInt(0)
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numeratorAccum := new(uint256.Int)
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_, overflow = numeratorAccum.MulOverflow(factor, denom)
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if overflow {
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return nil, fmt.Errorf("FakeExponential: overflow in MulOverflow(factor=%v, denom=%v)", factor, denom)
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}
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divisor := new(uint256.Int)
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for i := 1; numeratorAccum.Sign() > 0; i++ {
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_, overflow = output.AddOverflow(output, numeratorAccum)
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if overflow {
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return nil, fmt.Errorf("FakeExponential: overflow in AddOverflow(output=%v, numeratorAccum=%v)", output, numeratorAccum)
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}
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_, overflow = divisor.MulOverflow(denom, uint256.NewInt(uint64(i)))
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if overflow {
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return nil, fmt.Errorf("FakeExponential: overflow in MulOverflow(denom=%v, i=%v)", denom, i)
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}
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_, overflow = numeratorAccum.MulDivOverflow(numeratorAccum, numerator, divisor)
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if overflow {
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return nil, fmt.Errorf("FakeExponential: overflow in MulDivOverflow(numeratorAccum=%v, numerator=%v, divisor=%v)", numeratorAccum, numerator, divisor)
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}
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}
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return output.Div(output, denom), nil
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}
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// CountBlobs returns the number of blob transactions in txs
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func CountBlobs(txs []types.Transaction) int {
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var count int
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for _, tx := range txs {
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count += len(tx.GetDataHashes())
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}
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return count
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}
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// VerifyEip4844Header verifies that the header is not malformed
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func VerifyEip4844Header(config *chain.Config, parent, header *types.Header) error {
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if header.ExcessDataGas == nil {
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return fmt.Errorf("header is missing excessDataGas")
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}
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return nil
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}
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// GetDataGasPrice implements get_data_gas_price from EIP-4844
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func GetDataGasPrice(excessDataGas *big.Int) (*uint256.Int, error) {
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return FakeExponential(uint256.NewInt(params.MinDataGasPrice), uint256.NewInt(params.DataGasPriceUpdateFraction), excessDataGas)
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}
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func GetDataGasUsed(numBlobs int) uint64 {
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return uint64(numBlobs) * params.DataGasPerBlob
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}
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