rippled/src/libxrpl/protocol/STLedgerEntry.cpp

#include <xrpl/basics/Log.h>
#include <xrpl/basics/base_uint.h>
#include <xrpl/basics/contract.h>
#include <xrpl/basics/safe_cast.h>
#include <xrpl/beast/utility/instrumentation.h>
#include <xrpl/json/to_string.h>
#include <xrpl/protocol/Feature.h>
#include <xrpl/protocol/Indexes.h>
#include <xrpl/protocol/Keylet.h>
#include <xrpl/protocol/LedgerFormats.h>
#include <xrpl/protocol/Rules.h>
#include <xrpl/protocol/SField.h>
#include <xrpl/protocol/STBase.h>
#include <xrpl/protocol/STLedgerEntry.h>
#include <xrpl/protocol/STObject.h>
#include <xrpl/protocol/Serializer.h>
#include <xrpl/protocol/jss.h>

#include <boost/format/free_funcs.hpp>

#include <algorithm>
#include <array>
#include <cstddef>
#include <cstdint>
#include <stdexcept>
#include <string>
#include <utility>

namespace xrpl {

STLedgerEntry::STLedgerEntry(Keylet const& k) : STObject(sfLedgerEntry), key_(k.key), type_(k.type)
{
    auto const format = LedgerFormats::getInstance().findByType(type_);

    if (format == nullptr)
    {
        Throw<std::runtime_error>(
            "Attempt to create a SLE of unknown type " +
            std::to_string(safe_cast<std::uint16_t>(k.type)));
    }

    set(format->getSOTemplate());

    setFieldU16(sfLedgerEntryType, static_cast<std::uint16_t>(type_));
}

STLedgerEntry::STLedgerEntry(SerialIter& sit, uint256 const& index)
    : STObject(sfLedgerEntry), key_(index), type_(ltANY)
{
    set(sit);
    setSLEType();
}

STLedgerEntry::STLedgerEntry(STObject const& object, uint256 const& index)
    : STObject(object), key_(index), type_(ltANY)
{
    setSLEType();
}

void
STLedgerEntry::setSLEType()
{
    auto format = LedgerFormats::getInstance().findByType(
        safe_cast<LedgerEntryType>(getFieldU16(sfLedgerEntryType)));

    if (format == nullptr)
        Throw<std::runtime_error>("invalid ledger entry type");

    type_ = format->getType();
    applyTemplate(format->getSOTemplate());  // May throw
}

std::string
STLedgerEntry::getFullText() const
{
    auto const format = LedgerFormats::getInstance().findByType(type_);

    if (format == nullptr)
        Throw<std::runtime_error>("invalid ledger entry type");

    std::string ret = "\"";
    ret += to_string(key_);
    ret += "\" = { ";
    ret += format->getName();
    ret += ", ";
    ret += STObject::getFullText();
    ret += "}";
    return ret;
}

STBase*
STLedgerEntry::copy(std::size_t n, void* buf) const
{
    return emplace(n, buf, *this);
}

STBase*
STLedgerEntry::move(std::size_t n, void* buf)
{
    return emplace(n, buf, std::move(*this));
}

SerializedTypeID
STLedgerEntry::getSType() const
{
    return STI_LEDGERENTRY;
}

std::string
STLedgerEntry::getText() const
{
    return str(boost::format("{ %s, %s }") % to_string(key_) % STObject::getText());
}

Json::Value
STLedgerEntry::getJson(JsonOptions options) const
{
    Json::Value ret(STObject::getJson(options));

    ret[jss::index] = to_string(key_);

    if (getType() == ltMPTOKEN_ISSUANCE)
    {
        ret[jss::mpt_issuance_id] =
            to_string(makeMptID(getFieldU32(sfSequence), getAccountID(sfIssuer)));
    }

    return ret;
}

bool
STLedgerEntry::isThreadedType(Rules const& rules) const
{
    static constexpr std::array<LedgerEntryType, 5> newPreviousTxnIDTypes = {
        ltDIR_NODE, ltAMENDMENTS, ltFEE_SETTINGS, ltNEGATIVE_UNL, ltAMM};
    // Exclude PrevTxnID/PrevTxnLgrSeq if the fixPreviousTxnID amendment is not
    // enabled and the ledger object type is in the above set
    bool const excludePrevTxnID = !rules.enabled(fixPreviousTxnID) &&
        std::count(newPreviousTxnIDTypes.cbegin(), newPreviousTxnIDTypes.cend(), type_);
    return !excludePrevTxnID && getFieldIndex(sfPreviousTxnID) != -1;
}

bool
STLedgerEntry::thread(
    uint256 const& txID,
    std::uint32_t ledgerSeq,
    uint256& prevTxID,
    std::uint32_t& prevLedgerID)
{
    uint256 oldPrevTxID = getFieldH256(sfPreviousTxnID);

    JLOG(debugLog().info()) << "Thread Tx:" << txID << " prev:" << oldPrevTxID;

    if (oldPrevTxID == txID)
    {
        // this transaction is already threaded
        XRPL_ASSERT(
            getFieldU32(sfPreviousTxnLgrSeq) == ledgerSeq,
            "xrpl::STLedgerEntry::thread : ledger sequence match");
        return false;
    }

    prevTxID = oldPrevTxID;
    prevLedgerID = getFieldU32(sfPreviousTxnLgrSeq);
    setFieldH256(sfPreviousTxnID, txID);
    setFieldU32(sfPreviousTxnLgrSeq, ledgerSeq);
    return true;
}

}  // namespace xrpl