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;
};

}
}