AMMLiquidity.h

#pragma once
 
#include <xrpld/app/misc/AMMHelpers.h>
#include <xrpld/app/misc/AMMUtils.h>
#include <xrpld/app/paths/AMMContext.h>
 
#include <xrpl/basics/Log.h>
#include <xrpl/ledger/ReadView.h>
#include <xrpl/ledger/View.h>
#include <xrpl/protocol/Quality.h>
 
namespace xrpl {
 
template <typename TIn, typename TOut>
class AMMOffer;
 
template <typename TIn, typename TOut>
class AMMLiquidity
{
private:
    inline static Number const InitialFibSeqPct = Number(5) / 20000;
    AMMContext& ammContext_;
    AccountID const ammAccountID_;
    std::uint32_t const tradingFee_;
    Issue const issueIn_;
    Issue const issueOut_;
    // Initial AMM pool balances
    TAmounts<TIn, TOut> const initialBalances_;
    beast::Journal const j_;
 
public:
    AMMLiquidity(
        ReadView const& view,
        AccountID const& ammAccountID,
        std::uint32_t tradingFee,
        Issue const& in,
        Issue const& out,
        AMMContext& ammContext,
        beast::Journal j);
    ~AMMLiquidity() = default;
    AMMLiquidity(AMMLiquidity const&) = delete;
    AMMLiquidity&
    operator=(AMMLiquidity const&) = delete;
 
    std::optional<AMMOffer<TIn, TOut>>
    getOffer(ReadView const& view, std::optional<Quality> const& clobQuality) const;
 
    AccountID const&
    ammAccount() const
    {
        return ammAccountID_;
    }
 
    bool
    multiPath() const
    {
        return ammContext_.multiPath();
    }
 
    std::uint32_t
    tradingFee() const
    {
        return tradingFee_;
    }
 
    AMMContext&
    context() const
    {
        return ammContext_;
    }
 
    Issue const&
    issueIn() const
    {
        return issueIn_;
    }
 
    Issue const&
    issueOut() const
    {
        return issueOut_;
    }
 
private:
    TAmounts<TIn, TOut>
    fetchBalances(ReadView const& view) const;
 
    TAmounts<TIn, TOut>
    generateFibSeqOffer(TAmounts<TIn, TOut> const& balances) const;
 
    std::optional<AMMOffer<TIn, TOut>>
    maxOffer(TAmounts<TIn, TOut> const& balances, Rules const& rules) const;
};
 
}  // namespace xrpl