LedgerHistory.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 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_LEDGERHISTORY_H_INCLUDED
#define RIPPLE_APP_LEDGER_LEDGERHISTORY_H_INCLUDED
 
#include <ripple/app/ledger/Ledger.h>
#include <ripple/app/main/Application.h>
#include <ripple/beast/insight/Collector.h>
#include <ripple/beast/insight/Event.h>
#include <ripple/protocol/RippleLedgerHash.h>
 
namespace ripple {
 
// VFALCO TODO Rename to OldLedgers ?
 
class LedgerHistory
{
public:
    LedgerHistory(
        beast::insight::Collector::ptr const& collector,
        Application& app);
 
    bool
    insert(std::shared_ptr<Ledger const> ledger, bool validated);
 
    float
    getCacheHitRate()
    {
        return m_ledgers_by_hash.getHitRate();
    }
 
    std::shared_ptr<Ledger const>
    getLedgerBySeq(LedgerIndex ledgerIndex);
 
    std::shared_ptr<Ledger const>
    getLedgerByHash(LedgerHash const& ledgerHash);
 
    LedgerHash
    getLedgerHash(LedgerIndex ledgerIndex);
 
    void
    tune(int size, std::chrono::seconds age);
 
    void
    sweep()
    {
        m_ledgers_by_hash.sweep();
        m_consensus_validated.sweep();
    }
 
    void
    builtLedger(
        std::shared_ptr<Ledger const> const&,
        uint256 const& consensusHash,
        Json::Value);
 
    void
    validatedLedger(
        std::shared_ptr<Ledger const> const&,
        boost::optional<uint256> const& consensusHash);
 
    bool
    fixIndex(LedgerIndex ledgerIndex, LedgerHash const& ledgerHash);
 
    void
    clearLedgerCachePrior(LedgerIndex seq);
 
private:
    void
    handleMismatch(
        LedgerHash const& built,
        LedgerHash const& valid,
        boost::optional<uint256> const& builtConsensusHash,
        boost::optional<uint256> const& validatedConsensusHash,
        Json::Value const& consensus);
 
    Application& app_;
    beast::insight::Collector::ptr collector_;
    beast::insight::Counter mismatch_counter_;
 
    using LedgersByHash = TaggedCache<LedgerHash, Ledger const>;
 
    LedgersByHash m_ledgers_by_hash;
 
    // Maps ledger indexes to the corresponding hashes
    // For debug and logging purposes
    struct cv_entry
    {
        // Hash of locally built ledger
        boost::optional<LedgerHash> built;
        // Hash of the validated ledger
        boost::optional<LedgerHash> validated;
        // Hash of locally accepted consensus transaction set
        boost::optional<uint256> builtConsensusHash;
        // Hash of validated consensus transaction set
        boost::optional<uint256> validatedConsensusHash;
        // Consensus metadata of built ledger
        boost::optional<Json::Value> consensus;
    };
    using ConsensusValidated = TaggedCache<LedgerIndex, cv_entry>;
    ConsensusValidated m_consensus_validated;
 
    // Maps ledger indexes to the corresponding hash.
    std::map<LedgerIndex, LedgerHash> mLedgersByIndex;  // validated ledgers
 
    beast::Journal j_;
};
 
}  // namespace ripple
 
#endif