NetworkValidatedLedgers.hpp

//------------------------------------------------------------------------------
/*
    This file is part of clio: https://github.com/XRPLF/clio
    Copyright (c) 2022, the clio developers.
 
    Permission to use, copy, modify, and distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
 
    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
 
#pragma once
 
#include "etl/NetworkValidatedLedgersInterface.hpp"
 
#include <boost/signals2/connection.hpp>
#include <boost/signals2/signal.hpp>
#include <boost/signals2/variadic_signal.hpp>
 
#include <condition_variable>
#include <cstdint>
#include <memory>
#include <mutex>
#include <optional>
 
namespace etl {
 
class NetworkValidatedLedgers : public NetworkValidatedLedgersInterface {
    std::optional<uint32_t> latest_;  // currently known latest sequence validated by network
 
    mutable std::mutex mtx_;
    std::condition_variable cv_;
 
    SignalType notificationChannel_;
 
public:
    static std::shared_ptr<NetworkValidatedLedgers>
    makeValidatedLedgers();
 
    void
    push(uint32_t idx) final;
 
    std::optional<uint32_t>
    getMostRecent() final;
 
    bool
    waitUntilValidatedByNetwork(uint32_t sequence, std::optional<uint32_t> maxWaitMs = {}) final;
 
    boost::signals2::scoped_connection
    subscribe(SignalType::slot_type const& subscriber) override;
};
 
}  // namespace etl