plugeth/core/gaspool.go

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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
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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
// 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,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// 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/>.
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package core
import "math/big"
// GasPool tracks the amount of gas available during
// execution of the transactions in a block.
// The zero value is a pool with zero gas available.
type GasPool big.Int
// AddGas makes gas available for execution.
func (gp *GasPool) AddGas(amount *big.Int) *GasPool {
i := (*big.Int)(gp)
i.Add(i, amount)
return gp
}
// SubGas deducts the given amount from the pool if enough gas is
// available and returns an error otherwise.
func (gp *GasPool) SubGas(amount *big.Int) error {
i := (*big.Int)(gp)
if i.Cmp(amount) < 0 {
return &GasLimitErr{Have: new(big.Int).Set(i), Want: amount}
}
i.Sub(i, amount)
return nil
}
func (gp *GasPool) String() string {
return (*big.Int)(gp).String()
}