op-geth/consensus/misc/gaslimit.go

43 lines
1.5 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 (
"errors"
"fmt"
"github.com/ethereum/go-ethereum/params"
)
// VerifyGaslimit verifies the header gas limit according increase/decrease
// in relation to the parent gas limit.
func VerifyGaslimit(parentGasLimit, headerGasLimit uint64) error {
// Verify that the gas limit remains within allowed bounds
diff := int64(parentGasLimit) - int64(headerGasLimit)
if diff < 0 {
diff *= -1
}
limit := parentGasLimit / params.GasLimitBoundDivisor
if uint64(diff) >= limit {
return fmt.Errorf("invalid gas limit: have %d, want %d +-= %d", headerGasLimit, parentGasLimit, limit-1)
}
if headerGasLimit < params.MinGasLimit {
return errors.New("invalid gas limit below 5000")
}
return nil
}