47 lines
1.5 KiB
Go
47 lines
1.5 KiB
Go
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// Copyright 2014 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 core
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import "math/big"
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// GasPool tracks the amount of gas available during
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// execution of the transactions in a block.
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// The zero value is a pool with zero gas available.
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type GasPool big.Int
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// AddGas makes gas available for execution.
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func (gp *GasPool) AddGas(amount *big.Int) *GasPool {
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i := (*big.Int)(gp)
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i.Add(i, amount)
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return gp
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}
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// SubGas deducts the given amount from the pool if enough gas is
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// available and returns an error otherwise.
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func (gp *GasPool) SubGas(amount *big.Int) error {
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i := (*big.Int)(gp)
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if i.Cmp(amount) < 0 {
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return &GasLimitErr{Have: new(big.Int).Set(i), Want: amount}
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}
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i.Sub(i, amount)
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return nil
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}
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func (gp *GasPool) String() string {
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return (*big.Int)(gp).String()
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}
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