mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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70bc7f7a25
This PR contains very small EIP-4844 additions. GasPool is modified and now it is a struct with 2 fields "gas" and "dataGas" (blobs are priced in dataGas). ExcessDataGas block header field added. ExcessDataGas needed to compute the data gas price. EIP-4844 helper functions are added as well.
81 lines
2.7 KiB
Go
81 lines
2.7 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/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, num, denom *big.Int) *big.Int {
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output := new(big.Int)
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numAccum := new(big.Int).Mul(factor, denom)
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for i := 1; numAccum.Sign() > 0; i++ {
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output.Add(output, numAccum)
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numAccum.Mul(numAccum, num)
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iBig := big.NewInt(int64(i))
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numAccum.Div(numAccum, iBig.Mul(iBig, denom))
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}
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return output.Div(output, denom)
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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) *big.Int {
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return FakeExponential(big.NewInt(params.MinDataGasPrice), excessDataGas, big.NewInt(params.DataGasPriceUpdateFraction))
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}
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