Ledger.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_LEDGER_H_INCLUDED
#define RIPPLE_APP_LEDGER_LEDGER_H_INCLUDED
 
#include <ripple/basics/CountedObject.h>
#include <ripple/beast/utility/Journal.h>
#include <ripple/core/TimeKeeper.h>
#include <ripple/ledger/CachedView.h>
#include <ripple/ledger/View.h>
#include <ripple/protocol/Book.h>
#include <ripple/protocol/Indexes.h>
#include <ripple/protocol/STLedgerEntry.h>
#include <ripple/protocol/Serializer.h>
#include <ripple/protocol/TxMeta.h>
#include <ripple/shamap/SHAMap.h>
#include <mutex>
 
namespace ripple {
 
class Application;
class Job;
class TransactionMaster;
 
class SqliteStatement;
 
struct create_genesis_t
{
    explicit create_genesis_t() = default;
};
extern create_genesis_t const create_genesis;
 
class Ledger final : public std::enable_shared_from_this<Ledger>,
                     public DigestAwareReadView,
                     public TxsRawView,
                     public CountedObject<Ledger>
{
public:
    Ledger(Ledger const&) = delete;
    Ledger&
    operator=(Ledger const&) = delete;
 
    Ledger(
        create_genesis_t,
        Config const& config,
        std::vector<uint256> const& amendments,
        Family& family);
 
    Ledger(LedgerInfo const& info, Config const& config, Family& family);
 
    Ledger(
        LedgerInfo const& info,
        bool& loaded,
        bool acquire,
        Config const& config,
        Family& family,
        beast::Journal j);
 
    Ledger(Ledger const& previous, NetClock::time_point closeTime);
 
    // used for database ledgers
    Ledger(
        std::uint32_t ledgerSeq,
        NetClock::time_point closeTime,
        Config const& config,
        Family& family);
 
    ~Ledger() = default;
 
    //
    // ReadView
    //
 
    bool
    open() const override
    {
        return false;
    }
 
    LedgerInfo const&
    info() const override
    {
        return info_;
    }
 
    void
    setLedgerInfo(LedgerInfo const& info)
    {
        info_ = info;
    }
 
    Fees const&
    fees() const override
    {
        return fees_;
    }
 
    Rules const&
    rules() const override
    {
        return rules_;
    }
 
    bool
    exists(Keylet const& k) const override;
 
    bool
    exists(uint256 const& key) const;
 
    std::optional<uint256>
    succ(uint256 const& key, std::optional<uint256> const& last = std::nullopt)
        const override;
 
    std::shared_ptr<SLE const>
    read(Keylet const& k) const override;
 
    std::unique_ptr<sles_type::iter_base>
    slesBegin() const override;
 
    std::unique_ptr<sles_type::iter_base>
    slesEnd() const override;
 
    std::unique_ptr<sles_type::iter_base>
    slesUpperBound(uint256 const& key) const override;
 
    std::unique_ptr<txs_type::iter_base>
    txsBegin() const override;
 
    std::unique_ptr<txs_type::iter_base>
    txsEnd() const override;
 
    bool
    txExists(uint256 const& key) const override;
 
    tx_type
    txRead(key_type const& key) const override;
 
    //
    // DigestAwareReadView
    //
 
    std::optional<digest_type>
    digest(key_type const& key) const override;
 
    //
    // RawView
    //
 
    void
    rawErase(std::shared_ptr<SLE> const& sle) override;
 
    void
    rawInsert(std::shared_ptr<SLE> const& sle) override;
 
    void
    rawErase(uint256 const& key);
 
    void
    rawReplace(std::shared_ptr<SLE> const& sle) override;
 
    void
    rawDestroyXRP(XRPAmount const& fee) override
    {
        info_.drops -= fee;
    }
 
    //
    // TxsRawView
    //
 
    void
    rawTxInsert(
        uint256 const& key,
        std::shared_ptr<Serializer const> const& txn,
        std::shared_ptr<Serializer const> const& metaData) override;
 
    // Insert the transaction, and return the hash of the SHAMap leaf node
    // holding the transaction. The hash can be used to fetch the transaction
    // directly, instead of traversing the SHAMap
    // @param key transaction ID
    // @param txn transaction
    // @param metaData transaction metadata
    // @return hash of SHAMap leaf node that holds the transaction
    uint256
    rawTxInsertWithHash(
        uint256 const& key,
        std::shared_ptr<Serializer const> const& txn,
        std::shared_ptr<Serializer const> const& metaData);
 
    //--------------------------------------------------------------------------
 
    void
    setValidated() const
    {
        info_.validated = true;
    }
 
    void
    setAccepted(
        NetClock::time_point closeTime,
        NetClock::duration closeResolution,
        bool correctCloseTime);
 
    void
    setImmutable(bool rehash = true);
 
    bool
    isImmutable() const
    {
        return mImmutable;
    }
 
    /*  Mark this ledger as "should be full".
 
        "Full" is metadata property of the ledger, it indicates
        that the local server wants all the corresponding nodes
        in durable storage.
 
        This is marked `const` because it reflects metadata
        and not data that is in common with other nodes on the
        network.
    */
    void
    setFull() const
    {
        txMap_->setFull();
        stateMap_->setFull();
        txMap_->setLedgerSeq(info_.seq);
        stateMap_->setLedgerSeq(info_.seq);
    }
 
    void
    setTotalDrops(std::uint64_t totDrops)
    {
        info_.drops = totDrops;
    }
 
    SHAMap const&
    stateMap() const
    {
        return *stateMap_;
    }
 
    SHAMap&
    stateMap()
    {
        return *stateMap_;
    }
 
    SHAMap const&
    txMap() const
    {
        return *txMap_;
    }
 
    SHAMap&
    txMap()
    {
        return *txMap_;
    }
 
    // returns false on error
    bool
    addSLE(SLE const& sle);
 
    //--------------------------------------------------------------------------
 
    void
    updateSkipList();
 
    bool
    walkLedger(beast::Journal j, bool parallel = false) const;
 
    bool
    assertSensible(beast::Journal ledgerJ) const;
 
    void
    invariants() const;
    void
    unshare() const;
 
    hash_set<PublicKey>
    negativeUNL() const;
 
    std::optional<PublicKey>
    validatorToDisable() const;
 
    std::optional<PublicKey>
    validatorToReEnable() const;
 
    void
    updateNegativeUNL();
 
    bool
    isFlagLedger() const;
 
    bool
    isVotingLedger() const;
 
    std::shared_ptr<SLE>
    peek(Keylet const& k) const;
 
private:
    class sles_iter_impl;
    class txs_iter_impl;
 
    bool
    setup();
 
    void
    defaultFees(Config const& config);
 
    bool mImmutable;
 
    std::shared_ptr<SHAMap> txMap_;
    std::shared_ptr<SHAMap> stateMap_;
 
    // Protects fee variables
    std::mutex mutable mutex_;
 
    Fees fees_;
    Rules rules_;
    LedgerInfo info_;
    beast::Journal j_;
};
 
using CachedLedger = CachedView<Ledger>;
 
std::uint32_t constexpr FLAG_LEDGER_INTERVAL = 256;
bool
isFlagLedger(LedgerIndex seq);
 
//------------------------------------------------------------------------------
//
// API
//
//------------------------------------------------------------------------------
 
extern bool
pendSaveValidated(
    Application& app,
    std::shared_ptr<Ledger const> const& ledger,
    bool isSynchronous,
    bool isCurrent);
 
std::shared_ptr<Ledger>
loadLedgerHelper(LedgerInfo const& sinfo, Application& app, bool acquire);
 
std::shared_ptr<Ledger>
loadByIndex(std::uint32_t ledgerIndex, Application& app, bool acquire = true);
 
std::shared_ptr<Ledger>
loadByHash(uint256 const& ledgerHash, Application& app, bool acquire = true);
 
// Fetch the ledger with the highest sequence contained in the database
extern std::tuple<std::shared_ptr<Ledger>, std::uint32_t, uint256>
getLatestLedger(Application& app);
 
// *** Reporting Mode Only ***
// Fetch all of the transactions contained in ledger from the nodestore.
// The transactions are fetched directly as a batch, instead of traversing the
// transaction SHAMap. Fetching directly is significantly faster than
// traversing, as there are less database reads, and all of the reads can
// executed concurrently. This function only works in reporting mode.
// @param ledger the ledger for which to fetch the contained transactions
// @param app reference to the Application
// @return vector of (transaction, metadata) pairs
extern std::vector<
    std::pair<std::shared_ptr<STTx const>, std::shared_ptr<STObject const>>>
flatFetchTransactions(ReadView const& ledger, Application& app);
 
// *** Reporting Mode Only ***
// For each nodestore hash, fetch the transaction.
// The transactions are fetched directly as a batch, instead of traversing the
// transaction SHAMap. Fetching directly is significantly faster than
// traversing, as there are less database reads, and all of the reads can
// executed concurrently. This function only works in reporting mode.
// @param nodestoreHashes hashes of the transactions to fetch
// @param app reference to the Application
// @return vector of (transaction, metadata) pairs
extern std::vector<
    std::pair<std::shared_ptr<STTx const>, std::shared_ptr<STObject const>>>
flatFetchTransactions(Application& app, std::vector<uint256>& nodestoreHashes);
 
std::shared_ptr<STTx const>
deserializeTx(SHAMapItem const& item);
 
std::pair<std::shared_ptr<STTx const>, std::shared_ptr<STObject const>>
deserializeTxPlusMeta(SHAMapItem const& item);
 
uint256
calculateLedgerHash(LedgerInfo const& info);
 
}  // namespace ripple
 
#endif