BasicGasPricer.h

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/*
    This file is part of cpp-ethereum.

    cpp-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    cpp-ethereum 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once

#include <array>
#include "GasPricer.h"

namespace dev
{
namespace eth
{

class BasicGasPricer: public GasPricer
{
public:
    explicit BasicGasPricer(u256 _weiPerRef, u256 _refsPerBlock): m_weiPerRef(_weiPerRef), m_refsPerBlock(_refsPerBlock) {}

    void setRefPrice(u256 _weiPerRef) { if ((bigint)m_refsPerBlock * _weiPerRef > std::numeric_limits<u256>::max() ) BOOST_THROW_EXCEPTION(Overflow() << errinfo_comment("ether price * block fees is larger than 2**256-1, choose a smaller number.") ); else m_weiPerRef = _weiPerRef; }
    void setRefBlockFees(u256 _refsPerBlock) { if ((bigint)m_weiPerRef * _refsPerBlock > std::numeric_limits<u256>::max() ) BOOST_THROW_EXCEPTION(Overflow() << errinfo_comment("ether price * block fees is larger than 2**256-1, choose a smaller number.") ); else m_refsPerBlock = _refsPerBlock; }

    u256 ask(Block const&) const override { return m_weiPerRef * m_refsPerBlock / m_gasPerBlock; }
    u256 bid(TransactionPriority _p = TransactionPriority::Medium) const override { return m_octiles[(int)_p] > 0 ? m_octiles[(int)_p] : (m_weiPerRef * m_refsPerBlock / m_gasPerBlock); }

    void update(BlockChain const& _bc) override;

private:
    u256 m_weiPerRef;
    u256 m_refsPerBlock;
    u256 m_gasPerBlock = DefaultBlockGasLimit;
    std::array<u256, 9> m_octiles;
};

}
}