SkipListAcquire.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2020 Ripple Labs Inc.
 
    Permission to use, copy, modify, and/or 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.
*/
//==============================================================================
 
#ifndef RIPPLE_APP_LEDGER_SKIPLISTACQUIRE_H_INCLUDED
#define RIPPLE_APP_LEDGER_SKIPLISTACQUIRE_H_INCLUDED
 
#include <xrpld/app/ledger/InboundLedger.h>
#include <xrpld/app/ledger/Ledger.h>
#include <xrpld/app/ledger/detail/TimeoutCounter.h>
#include <xrpld/app/main/Application.h>
#include <xrpld/shamap/SHAMap.h>
 
namespace ripple {
class InboundLedgers;
class PeerSet;
namespace test {
class LedgerReplayClient;
}  // namespace test
 
class SkipListAcquire final
    : public TimeoutCounter,
      public std::enable_shared_from_this<SkipListAcquire>,
      public CountedObject<SkipListAcquire>
{
public:
    using OnSkipListDataCB =
        std::function<void(bool successful, uint256 const& hash)>;
 
    struct SkipListData
    {
        std::uint32_t const ledgerSeq;
        std::vector<ripple::uint256> const skipList;
 
        SkipListData(
            std::uint32_t const ledgerSeq,
            std::vector<ripple::uint256> const& skipList)
            : ledgerSeq(ledgerSeq), skipList(skipList)
        {
        }
    };
 
    SkipListAcquire(
        Application& app,
        InboundLedgers& inboundLedgers,
        uint256 const& ledgerHash,
        std::unique_ptr<PeerSet> peerSet);
 
    ~SkipListAcquire() override;
 
    void
    init(int numPeers);
 
    void
    processData(
        std::uint32_t ledgerSeq,
        boost::intrusive_ptr<SHAMapItem const> const& item);
 
    void
    addDataCallback(OnSkipListDataCB&& cb);
 
    std::shared_ptr<SkipListData const>
    getData() const;
 
private:
    void
    onTimer(bool progress, ScopedLockType& peerSetLock) override;
 
    std::weak_ptr<TimeoutCounter>
    pmDowncast() override;
 
    void
    trigger(std::size_t limit, ScopedLockType& sl);
 
    void
    retrieveSkipList(
        std::shared_ptr<Ledger const> const& ledger,
        ScopedLockType& sl);
 
    void
    onSkipListAcquired(
        std::vector<uint256> const& skipList,
        std::uint32_t ledgerSeq,
        ScopedLockType& sl);
 
    void
    notify(ScopedLockType& sl);
 
    InboundLedgers& inboundLedgers_;
    std::unique_ptr<PeerSet> peerSet_;
    std::vector<OnSkipListDataCB> dataReadyCallbacks_;
    std::shared_ptr<SkipListData const> data_;
    std::uint32_t noFeaturePeerCount_ = 0;
    bool fallBack_ = false;
 
    friend class test::LedgerReplayClient;
};
 
}  // namespace ripple
 
#endif