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