GasPricer.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 <libethcore/Common.h>

namespace dev
{
namespace eth
{

class Block;
class BlockChain;

enum class TransactionPriority
{
        Lowest = 0,
        Low = 2,
        Medium = 4,
        High = 6,
        Highest = 8
};

static const u256 DefaultGasPrice = 20 * shannon;

class GasPricer
{
public:
        GasPricer() = default;
        virtual ~GasPricer() = default;

        virtual u256 ask(Block const&) const = 0;
        virtual u256 bid(TransactionPriority _p = TransactionPriority::Medium) const = 0;

        virtual void update(BlockChain const&) {}
};

class TrivialGasPricer: public GasPricer
{
public:
        TrivialGasPricer() = default;
        TrivialGasPricer(u256 const& _ask, u256 const& _bid): m_ask(_ask), m_bid(_bid) {}

        void setAsk(u256 const& _ask) { m_ask = _ask; }
        void setBid(u256 const& _bid) { m_bid = _bid; }

        u256 ask() const { return m_ask; }
        u256 ask(Block const&) const override { return m_ask; }
        u256 bid(TransactionPriority = TransactionPriority::Medium) const override { return m_bid; }

private:
        u256 m_ask = DefaultGasPrice;
        u256 m_bid = DefaultGasPrice;
};

}
}