Exemplo n.º 1
0
TER Change::applyFee ()
{

    SLE::pointer feeObject = mEngine->entryCache (
        ltFEE_SETTINGS, Ledger::getLedgerFeeIndex ());

    if (!feeObject)
        feeObject = mEngine->entryCreate (
            ltFEE_SETTINGS, Ledger::getLedgerFeeIndex ());

    m_journal.trace << 
        "Previous fee object: " << feeObject->getJson (0);

    feeObject->setFieldU64 (
        sfBaseFee, mTxn.getFieldU64 (sfBaseFee));
    feeObject->setFieldU32 (
        sfReferenceFeeUnits, mTxn.getFieldU32 (sfReferenceFeeUnits));
    feeObject->setFieldU32 (
        sfReserveBase, mTxn.getFieldU32 (sfReserveBase));
    feeObject->setFieldU32 (
        sfReserveIncrement, mTxn.getFieldU32 (sfReserveIncrement));

    mEngine->entryModify (feeObject);

    m_journal.trace << 
        "New fee object: " << feeObject->getJson (0);
    m_journal.warning << "Fees have been changed";
    return tesSUCCESS;
}
Exemplo n.º 2
0
TER
CreateOffer::doApply ()
{
    if (m_journal.debug) m_journal.debug <<
        "OfferCreate> " << mTxn.getJson (0);

    std::uint32_t const uTxFlags = mTxn.getFlags ();

    bool const bPassive (uTxFlags & tfPassive);
    bool const bImmediateOrCancel (uTxFlags & tfImmediateOrCancel);
    bool const bFillOrKill (uTxFlags & tfFillOrKill);
    bool const bSell  (uTxFlags & tfSell);

    STAmount saTakerPays = mTxn.getFieldAmount (sfTakerPays);
    STAmount saTakerGets = mTxn.getFieldAmount (sfTakerGets);

    if (!saTakerPays.isLegalNet () || !saTakerGets.isLegalNet ())
        return temBAD_AMOUNT;

    auto const& uPaysIssuerID = saTakerPays.getIssuer ();
    auto const& uPaysCurrency = saTakerPays.getCurrency ();

    auto const& uGetsIssuerID = saTakerGets.getIssuer ();
    auto const& uGetsCurrency = saTakerGets.getCurrency ();

    bool const bHaveExpiration (mTxn.isFieldPresent (sfExpiration));
    bool const bHaveCancel (mTxn.isFieldPresent (sfOfferSequence));

    std::uint32_t const uExpiration = mTxn.getFieldU32 (sfExpiration);
    std::uint32_t const uCancelSequence = mTxn.getFieldU32 (sfOfferSequence);

    // FIXME understand why we use SequenceNext instead of current transaction
    //       sequence to determine the transaction. Why is the offer seuqnce
    //       number insufficient?

    std::uint32_t const uAccountSequenceNext = mTxnAccount->getFieldU32 (sfSequence);
    std::uint32_t const uSequence = mTxn.getSequence ();

    const uint256 uLedgerIndex = Ledger::getOfferIndex (mTxnAccountID, uSequence);

    if (m_journal.debug)
    {
        m_journal.debug <<
            "Creating offer node: " << to_string (uLedgerIndex) <<
            " uSequence=" << uSequence;

        if (bImmediateOrCancel)
            m_journal.debug << "Transaction: IoC set.";

        if (bFillOrKill)
            m_journal.debug << "Transaction: FoK set.";
    }

    // This is the original rate of this offer, and is the rate at which it will
    // be placed, even if crossing offers change the amounts.
    std::uint64_t const uRate = STAmount::getRate (saTakerGets, saTakerPays);

    TER terResult (tesSUCCESS);

    // This is the ledger view that we work against. Transactions are applied
    // as we go on processing transactions.
    core::LedgerView& view (mEngine->view ());

    // This is a checkpoint with just the fees paid. If something goes wrong
    // with this transaction, we roll back to this ledger.
    core::LedgerView view_checkpoint (view);

    view.bumpSeq (); // Begin ledger variance.

    SLE::pointer sleCreator = mEngine->entryCache (
        ltACCOUNT_ROOT, Ledger::getAccountRootIndex (mTxnAccountID));

    if (uTxFlags & tfOfferCreateMask)
    {
        if (m_journal.debug) m_journal.debug <<
            "Malformed transaction: Invalid flags set.";

        terResult = temINVALID_FLAG;
    }
    else if (bImmediateOrCancel && bFillOrKill)
    {
        if (m_journal.debug) m_journal.debug <<
            "Malformed transaction: both IoC and FoK set.";

        terResult = temINVALID_FLAG;
    }
    else if (bHaveExpiration && !uExpiration)
    {
        m_journal.warning <<
            "Malformed offer: bad expiration";

        terResult = temBAD_EXPIRATION;
    }
    else if (saTakerPays.isNative () && saTakerGets.isNative ())
    {
        m_journal.warning <<
            "Malformed offer: XRP for XRP";

        terResult = temBAD_OFFER;
    }
    else if (saTakerPays <= zero || saTakerGets <= zero)
    {
        m_journal.warning <<
            "Malformed offer: bad amount";

        terResult = temBAD_OFFER;
    }
    else if (uPaysCurrency == uGetsCurrency && uPaysIssuerID == uGetsIssuerID)
    {
        m_journal.warning <<
            "Malformed offer: redundant offer";

        terResult = temREDUNDANT;
    }
    // We don't allow a non-native currency to use the currency code XRP.
    else if (badCurrency() == uPaysCurrency || badCurrency() == uGetsCurrency)
    {
        m_journal.warning <<
            "Malformed offer: Bad currency.";

        terResult = temBAD_CURRENCY;
    }
    else if (saTakerPays.isNative () != !uPaysIssuerID ||
             saTakerGets.isNative () != !uGetsIssuerID)
    {
        m_journal.warning <<
            "Malformed offer: bad issuer";

        terResult = temBAD_ISSUER;
    }
    else if (view.isGlobalFrozen (uPaysIssuerID) || view.isGlobalFrozen (uGetsIssuerID))
    {
        m_journal.warning <<
            "Offer involves frozen asset";

        terResult = tecFROZEN;
    }
    else if (view.accountFunds (
        mTxnAccountID, saTakerGets, fhZERO_IF_FROZEN) <= zero)
    {
        m_journal.warning <<
            "delay: Offers must be at least partially funded.";

        terResult = tecUNFUNDED_OFFER;
    }
    // This can probably be simplified to make sure that you cancel sequences
    // before the transaction sequence number.
    else if (bHaveCancel && (!uCancelSequence || uAccountSequenceNext - 1 <= uCancelSequence))
    {
        if (m_journal.debug) m_journal.debug <<
            "uAccountSequenceNext=" << uAccountSequenceNext <<
            " uOfferSequence=" << uCancelSequence;

        terResult = temBAD_SEQUENCE;
    }

    if (terResult != tesSUCCESS)
    {
        if (m_journal.debug) m_journal.debug <<
            "final terResult=" << transToken (terResult);

        return terResult;
    }

    // Process a cancellation request that's passed along with an offer.
    if ((terResult == tesSUCCESS) && bHaveCancel)
    {
        uint256 const uCancelIndex (
            Ledger::getOfferIndex (mTxnAccountID, uCancelSequence));
        SLE::pointer sleCancel = mEngine->entryCache (ltOFFER, uCancelIndex);

        // It's not an error to not find the offer to cancel: it might have
        // been consumed or removed as we are processing.
        if (sleCancel)
        {
            m_journal.warning <<
                "Cancelling order with sequence " << uCancelSequence;

            terResult = view.offerDelete (sleCancel);
        }
    }

    // Expiration is defined in terms of the close time of the parent ledger,
    // because we definitively know the time that it closed but we do not
    // know the closing time of the ledger that is under construction.
    if (bHaveExpiration &&
        (mEngine->getLedger ()->getParentCloseTimeNC () >= uExpiration))
    {
        return tesSUCCESS;
    }

    // Make sure that we are authorized to hold what the taker will pay us.
    if (terResult == tesSUCCESS && !saTakerPays.isNative ())
        terResult = checkAcceptAsset (Issue (uPaysCurrency, uPaysIssuerID));

    bool crossed = false;
    bool const bOpenLedger (mParams & tapOPEN_LEDGER);

    if (terResult == tesSUCCESS)
    {
        // We reverse gets and pays because during offer crossing we are taking.
        core::Amounts const taker_amount (saTakerGets, saTakerPays);

        // The amount of the offer that we will need to place, after we finish
        // offer crossing processing. It may be equal to the original amount,
        // empty (fully crossed), or something in-between.
        core::Amounts place_offer;

        std::tie(terResult, place_offer) = crossOffers (view, taker_amount);

        if (terResult == tecFAILED_PROCESSING && bOpenLedger)
            terResult = telFAILED_PROCESSING;

        if (terResult == tesSUCCESS)
        {
            // We now need to reduce the offer by the cross flow. We reverse
            // in and out here, since during crossing we were takers.
            assert (saTakerPays.getCurrency () == place_offer.out.getCurrency ());
            assert (saTakerPays.getIssuer () == place_offer.out.getIssuer ());
            assert (saTakerGets.getCurrency () == place_offer.in.getCurrency ());
            assert (saTakerGets.getIssuer () == place_offer.in.getIssuer ());

            if (taker_amount != place_offer)
                crossed = true;

            if (m_journal.debug)
            {
                m_journal.debug << "Offer Crossing: " << transToken (terResult);

                if (terResult == tesSUCCESS)
                {
                    m_journal.debug <<
                        "    takerPays: " << saTakerPays.getFullText () <<
                        " -> " << place_offer.out.getFullText ();
                    m_journal.debug <<
                        "    takerGets: " << saTakerGets.getFullText () <<
                        " -> " << place_offer.in.getFullText ();
                }
            }

            saTakerPays = place_offer.out;
            saTakerGets = place_offer.in;
        }
    }

    if (terResult != tesSUCCESS)
    {
        m_journal.debug <<
            "final terResult=" << transToken (terResult);

        return terResult;
    }

    if (m_journal.debug)
    {
        m_journal.debug <<
            "takeOffers: saTakerPays=" <<saTakerPays.getFullText ();
        m_journal.debug <<
            "takeOffers: saTakerGets=" << saTakerGets.getFullText ();
        m_journal.debug <<
            "takeOffers: mTxnAccountID=" <<
            to_string (mTxnAccountID);
        m_journal.debug <<
            "takeOffers:         FUNDS=" << view.accountFunds (
            mTxnAccountID, saTakerGets, fhZERO_IF_FROZEN).getFullText ();
    }

    if (saTakerPays < zero || saTakerGets < zero)
    {
        // Earlier, we verified that the amounts, as specified in the offer,
        // were not negative. That they are now suggests that something went
        // very wrong with offer crossing.
        m_journal.fatal << (crossed ? "Partially consumed" : "Full") <<
            " offer has negative component:" <<
            " pays=" << saTakerPays.getFullText () <<
            " gets=" << saTakerGets.getFullText ();

        assert (saTakerPays >= zero);
        assert (saTakerGets >= zero);
        return tefINTERNAL;
    }

    if (bFillOrKill && (saTakerPays != zero || saTakerGets != zero))
    {
        // Fill or kill and have leftovers.
        view.swapWith (view_checkpoint); // Restore with just fees paid.
        return tesSUCCESS;
    }

    // What the reserve would be if this offer was placed.
    auto const accountReserve (mEngine->getLedger ()->getReserve (
        sleCreator->getFieldU32 (sfOwnerCount) + 1));

    if (saTakerPays == zero ||                // Wants nothing more.
        saTakerGets == zero ||                // Offering nothing more.
        bImmediateOrCancel)                   // Do not persist.
    {
        // Complete as is.
    }
    else if (mPriorBalance.getNValue () < accountReserve)
    {
        // If we are here, the signing account had an insufficient reserve
        // *prior* to our processing. We use the prior balance to simplify
        // client writing and make the user experience better.

        if (bOpenLedger) // Ledger is not final, can vote no.
        {
            // Hope for more reserve to come in or more offers to consume. If we
            // specified a local error this transaction will not be retried, so
            // specify a tec to distribute the transaction and allow it to be
            // retried. In particular, it may have been successful to a
            // degree (partially filled) and if it hasn't, it might succeed.
            terResult = tecINSUF_RESERVE_OFFER;
        }
        else if (!crossed)
        {
            // Ledger is final, insufficent reserve to create offer, processed
            // nothing.
            terResult = tecINSUF_RESERVE_OFFER;
        }
        else
        {
            // Ledger is final, insufficent reserve to create offer, processed
            // something.

            // Consider the offer unfunded. Treat as tesSUCCESS.
        }
    }
    else
    {
        assert (saTakerPays > zero);
        assert (saTakerGets > zero);

        // We need to place the remainder of the offer into its order book.
        if (m_journal.debug) m_journal.debug <<
            "offer not fully consumed:" <<
            " saTakerPays=" << saTakerPays.getFullText () <<
            " saTakerGets=" << saTakerGets.getFullText ();

        std::uint64_t uOwnerNode;
        std::uint64_t uBookNode;
        uint256 uDirectory;

        // Add offer to owner's directory.
        terResult = view.dirAdd (uOwnerNode,
            Ledger::getOwnerDirIndex (mTxnAccountID), uLedgerIndex,
            std::bind (
                &Ledger::ownerDirDescriber, std::placeholders::_1,
                std::placeholders::_2, mTxnAccountID));

        if (tesSUCCESS == terResult)
        {
            // Update owner count.
            view.ownerCountAdjust (mTxnAccountID, 1, sleCreator);

            uint256 const uBookBase (Ledger::getBookBase (
                {{uPaysCurrency, uPaysIssuerID},
                    {uGetsCurrency, uGetsIssuerID}}));

            if (m_journal.debug) m_journal.debug <<
                "adding to book: " << to_string (uBookBase) <<
                " : " << saTakerPays.getHumanCurrency () <<
                "/" << to_string (saTakerPays.getIssuer ()) <<
                " -> " << saTakerGets.getHumanCurrency () <<
                "/" << to_string (saTakerGets.getIssuer ());

            // We use the original rate to place the offer.
            uDirectory = Ledger::getQualityIndex (uBookBase, uRate);

            // Add offer to order book.
            terResult = view.dirAdd (uBookNode, uDirectory, uLedgerIndex,
                std::bind (
                    &Ledger::qualityDirDescriber, std::placeholders::_1,
                    std::placeholders::_2, saTakerPays.getCurrency (),
                    uPaysIssuerID, saTakerGets.getCurrency (),
                    uGetsIssuerID, uRate));
        }

        if (tesSUCCESS == terResult)
        {
            if (m_journal.debug)
            {
                m_journal.debug <<
                    "sfAccount=" <<
                    to_string (mTxnAccountID);
                m_journal.debug <<
                    "uPaysIssuerID=" <<
                    to_string (uPaysIssuerID);
                m_journal.debug <<
                    "uGetsIssuerID=" <<
                    to_string (uGetsIssuerID);
                m_journal.debug <<
                    "saTakerPays.isNative()=" <<
                    saTakerPays.isNative ();
                m_journal.debug <<
                    "saTakerGets.isNative()=" <<
                    saTakerGets.isNative ();
                m_journal.debug <<
                    "uPaysCurrency=" <<
                    saTakerPays.getHumanCurrency ();
                m_journal.debug <<
                    "uGetsCurrency=" <<
                    saTakerGets.getHumanCurrency ();
            }

            SLE::pointer sleOffer (mEngine->entryCreate (ltOFFER, uLedgerIndex));

            sleOffer->setFieldAccount (sfAccount, mTxnAccountID);
            sleOffer->setFieldU32 (sfSequence, uSequence);
            sleOffer->setFieldH256 (sfBookDirectory, uDirectory);
            sleOffer->setFieldAmount (sfTakerPays, saTakerPays);
            sleOffer->setFieldAmount (sfTakerGets, saTakerGets);
            sleOffer->setFieldU64 (sfOwnerNode, uOwnerNode);
            sleOffer->setFieldU64 (sfBookNode, uBookNode);

            if (uExpiration)
                sleOffer->setFieldU32 (sfExpiration, uExpiration);

            if (bPassive)
                sleOffer->setFlag (lsfPassive);

            if (bSell)
                sleOffer->setFlag (lsfSell);

            if (m_journal.debug) m_journal.debug <<
                "final terResult=" << transToken (terResult) <<
                " sleOffer=" << sleOffer->getJson (0);
        }
    }

    if (terResult != tesSUCCESS)
    {
        m_journal.debug <<
            "final terResult=" << transToken (terResult);
    }

    return terResult;
}
Exemplo n.º 3
0
// Take as much as possible. Adjusts account balances. Charges fees on top to taker.
// -->    uBookBase: The order book to take against.
// -->  saTakerPays: What the taker offers (w/ issuer)
// -->  saTakerGets: What the taker wanted (w/ issuer)
// <--  saTakerPaid: What taker could have paid including saved not including fees. To reduce an offer.
// <--   saTakerGot: What taker got not including fees. To reduce an offer.
// <--    terResult: tesSUCCESS, terNO_ACCOUNT, telFAILED_PROCESSING, or tecFAILED_PROCESSING
// <--    bUnfunded: if tesSUCCESS, consider offer unfunded after taking.
TER OfferCreateTransactor::takeOffers (
    const bool          bOpenLedger,
    const bool          bPassive,
    const bool          bSell,
    uint256 const&      uBookBase,
    const uint160&      uTakerAccountID,
    SLE::ref            sleTakerAccount,
    const STAmount&     saTakerPays,
    const STAmount&     saTakerGets,
    STAmount&           saTakerPaid,
    STAmount&           saTakerGot,
    bool&               bUnfunded)
{
    // The book has the most elements. Take the perspective of the book.
    // Book is ordered for taker: taker pays / taker gets (smaller is better)

    // The order is for the other books currencys for get and pays are opposites.
    // We want the same ratio for the respective currencies.
    // So we swap paid and gets for determing take quality.

    assert (saTakerPays && saTakerGets);

    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: bSell: " << bSell << ": against book: " << uBookBase.ToString ();

    LedgerEntrySet&         lesActive           = mEngine->getNodes ();
    const uint64            uTakeQuality        = STAmount::getRate (saTakerGets, saTakerPays);
    STAmount                saTakerRate         = STAmount::setRate (uTakeQuality);
    const uint160           uTakerPaysAccountID = saTakerPays.getIssuer ();
    const uint160           uTakerGetsAccountID = saTakerGets.getIssuer ();
    TER                     terResult           = temUNCERTAIN;

    boost::unordered_set<uint256>   usOfferUnfundedBecame;  // Offers that became unfunded.
    boost::unordered_set<uint160>   usAccountTouched;       // Accounts touched.

    saTakerPaid     = STAmount (saTakerPays.getCurrency (), saTakerPays.getIssuer ());
    saTakerGot      = STAmount (saTakerGets.getCurrency (), saTakerGets.getIssuer ());
    bUnfunded       = false;

    OrderBookIterator bookIterator (lesActive,
        saTakerPays.getCurrency(), saTakerPays.getIssuer(),
        saTakerGets.getCurrency(), saTakerGets.getIssuer());

    while ((temUNCERTAIN == terResult) && bookIterator.nextOffer())
    {
        STAmount        saTakerFunds    = lesActive.accountFunds (uTakerAccountID, saTakerPays);
        STAmount        saSubTakerPays  = saTakerPays - saTakerPaid; // How much more to spend.
        STAmount        saSubTakerGets  = saTakerGets - saTakerGot; // How much more is wanted.
        uint64          uTipQuality     = bookIterator.getCurrentQuality();

        if (!saTakerFunds.isPositive ())
        {
            // Taker is out of funds. Don't create the offer.
            bUnfunded = true;
            terResult = tesSUCCESS;
        }
        else if (!saSubTakerPays.isPositive() || !saSubTakerGets.isPositive())
        {
            // Offer is completely consumed
            terResult = tesSUCCESS;
        }
        else if ((uTakeQuality < uTipQuality)
                 || (bPassive && uTakeQuality == uTipQuality))
        {
            // Offer does not cross this offer
            STAmount    saTipRate           = STAmount::setRate (uTipQuality);

            WriteLog (lsDEBUG, OfferCreateTransactor) << boost::str (boost::format ("takeOffers: done: uTakeQuality=%d %c uTipQuality=%d saTakerRate=%s %c saTipRate=%s bPassive=%d")
                    % uTakeQuality
                    % (uTakeQuality == uTipQuality
                       ? '='
                       : uTakeQuality < uTipQuality
                       ? '<'
                       : '>')
                    % uTipQuality
                    % saTakerRate
                    % (saTakerRate == saTipRate
                       ? '='
                       : saTakerRate < saTipRate
                       ? '<'
                       : '>')
                    % saTipRate
                    % bPassive);

            terResult   = tesSUCCESS;
        }
        else
        {
            // We have a crossing offer to consider.

            SLE::pointer    sleOffer        = bookIterator.getCurrentOffer ();

            if (!sleOffer)
            { // offer is in directory but not in ledger
                uint256 offerIndex = bookIterator.getCurrentIndex ();
                WriteLog (lsWARNING, OfferCreateTransactor) << "takeOffers: offer not found : " << offerIndex;
                usMissingOffers.insert (missingOffer_t (
                    bookIterator.getCurrentIndex (), bookIterator.getCurrentDirectory ()));
            }
            else
            {
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: considering offer : " << sleOffer->getJson (0);

                const uint160&  uOfferOwnerID   = sleOffer->getFieldAccount160 (sfAccount);
                STAmount        saOfferPays     = sleOffer->getFieldAmount (sfTakerGets);
                STAmount        saOfferGets     = sleOffer->getFieldAmount (sfTakerPays);

                STAmount        saOfferFunds;   // Funds of offer owner to payout.
                bool            bValid;

                bValid  =  bValidOffer (
                               sleOffer, uOfferOwnerID, saOfferPays, saOfferGets,
                               uTakerAccountID,
                               usOfferUnfundedFound, usOfferUnfundedBecame, usAccountTouched,
                               saOfferFunds);

                if (bValid)
                {
                    STAmount    saSubTakerPaid;
                    STAmount    saSubTakerGot;
                    STAmount    saTakerIssuerFee;
                    STAmount    saOfferIssuerFee;
                    STAmount    saOfferRate = STAmount::setRate (uTipQuality);

                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerPays: " << saTakerPays.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerPaid: " << saTakerPaid.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:   saTakerFunds: " << saTakerFunds.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:   saOfferFunds: " << saOfferFunds.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:    saOfferPays: " << saOfferPays.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:    saOfferGets: " << saOfferGets.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:    saOfferRate: " << saOfferRate.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer: saSubTakerPays: " << saSubTakerPays.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer: saSubTakerGets: " << saSubTakerGets.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerPays: " << saTakerPays.getFullText ();
                    WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerGets: " << saTakerGets.getFullText ();

                    bool    bOfferDelete    = STAmount::applyOffer (
                                                  bSell,
                                                  lesActive.rippleTransferRate (uTakerAccountID, uOfferOwnerID, uTakerPaysAccountID),
                                                  lesActive.rippleTransferRate (uOfferOwnerID, uTakerAccountID, uTakerGetsAccountID),
                                                  saOfferRate,
                                                  saOfferFunds,
                                                  saTakerFunds,
                                                  saOfferPays,
                                                  saOfferGets,
                                                  saSubTakerPays,
                                                  saSubTakerGets,
                                                  saSubTakerPaid,
                                                  saSubTakerGot,
                                                  saTakerIssuerFee,
                                                  saOfferIssuerFee);

                    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer: saSubTakerPaid: " << saSubTakerPaid.getFullText ();
                    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:  saSubTakerGot: " << saSubTakerGot.getFullText ();

                    // Adjust offer

                    // Offer owner will pay less.  Subtract what taker just got.
                    sleOffer->setFieldAmount (sfTakerGets, saOfferPays -= saSubTakerGot);

                    // Offer owner will get less.  Subtract what owner just paid.
                    sleOffer->setFieldAmount (sfTakerPays, saOfferGets -= saSubTakerPaid);

                    mEngine->entryModify (sleOffer);

                    if (bOfferDelete)
                    {
                        // Offer now fully claimed or now unfunded.
                        WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: Offer claimed: Delete.";

                        usOfferUnfundedBecame.insert (sleOffer->getIndex()); // Delete unfunded offer on success.

                        // Offer owner's account is no longer pristine.
                        usAccountTouched.insert (uOfferOwnerID);
                    }
                    else if (saSubTakerGot)
                    {
                        WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: Offer partial claim.";

                        if (!saOfferPays.isPositive () || !saOfferGets.isPositive ())
                        {
                            WriteLog (lsWARNING, OfferCreateTransactor) << "takeOffers: ILLEGAL OFFER RESULT.";
                            bUnfunded   = true;
                            terResult   = bOpenLedger ? telFAILED_PROCESSING : tecFAILED_PROCESSING;
                        }
                    }
                    else
                    {
                        // Taker got nothing, probably due to rounding. Consider taker unfunded.
                        WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: No claim.";

                        bUnfunded   = true;
                        terResult   = tesSUCCESS;                   // Done.
                    }

                    assert (uTakerGetsAccountID == saSubTakerGot.getIssuer ());
                    assert (uTakerPaysAccountID == saSubTakerPaid.getIssuer ());

                    if (!bUnfunded)
                    {
                        // Distribute funds. The sends charge appropriate fees which are implied by offer.

                        terResult   = lesActive.accountSend (uOfferOwnerID, uTakerAccountID, saSubTakerGot);            // Offer owner pays taker.

                        if (tesSUCCESS == terResult)
                            terResult   = lesActive.accountSend (uTakerAccountID, uOfferOwnerID, saSubTakerPaid);           // Taker pays offer owner.

                        if (bSell)
                        {
                            // Sell semantics:
                            // Reduce amount considered received to original offer's rate.
                            // Not by crossing rate, which is higher.
                            STAmount saEffectiveGot = STAmount::divide(saSubTakerPaid, saTakerRate, saTakerGets);
                            saSubTakerGot = std::min(saEffectiveGot, saSubTakerGot);
                        }
                        else
                        {
                            // Buy semantics: Reduce amount considered paid by taker's rate. Not by actual cost which is lower.
                            // That is, take less as to just satify our buy requirement.
                            STAmount    saTakerCould    = saTakerPays - saTakerPaid;    // Taker could pay.

                            if (saTakerFunds < saTakerCould)
                                saTakerCould    = saTakerFunds;

                            STAmount    saTakerUsed = STAmount::multiply (saSubTakerGot, saTakerRate, saTakerPays);

                            WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:   saTakerCould: " << saTakerCould.getFullText ();
                            WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:  saSubTakerGot: " << saSubTakerGot.getFullText ();
                            WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerRate: " << saTakerRate.getFullText ();
                            WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerUsed: " << saTakerUsed.getFullText ();

                            saSubTakerPaid  = std::min (saTakerCould, saTakerUsed);
                        }

                        saTakerPaid     += saSubTakerPaid;
                        saTakerGot      += saSubTakerGot;

                        if (tesSUCCESS == terResult)
                            terResult   = temUNCERTAIN;
                    }
                }
            }
        }
    }

    if (temUNCERTAIN == terResult)
        terResult = tesSUCCESS;

    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: " << transToken (terResult);

    if (tesSUCCESS == terResult)
    {
        // On success, delete offers that became unfunded.
        BOOST_FOREACH (uint256 const & uOfferIndex, usOfferUnfundedBecame)
        {
            WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: became unfunded: " << uOfferIndex.ToString ();

            terResult   = lesActive.offerDelete (uOfferIndex);

            if (tesSUCCESS != terResult)
                break;
        }
Exemplo n.º 4
0
// Take as much as possible. Adjusts account balances. Charges fees on top to taker.
// -->    uBookBase: The order book to take against.
// -->  saTakerPays: What the taker offers (w/ issuer)
// -->  saTakerGets: What the taker wanted (w/ issuer)
// <--  saTakerPaid: What taker could have paid including saved not including fees. To reduce an offer.
// <--   saTakerGot: What taker got not including fees. To reduce an offer.
// <--    terResult: tesSUCCESS, terNO_ACCOUNT, telFAILED_PROCESSING, or tecFAILED_PROCESSING
// <--    bUnfunded: if tesSUCCESS, consider offer unfunded after taking.
TER OfferCreateTransactor::takeOffers (
    const bool          bOpenLedger,
    const bool          bPassive,
    const bool          bSell,
    uint256 const&      uBookBase,
    const uint160&      uTakerAccountID,
    SLE::ref            sleTakerAccount,
    const STAmount&     saTakerPays,
    const STAmount&     saTakerGets,
    STAmount&           saTakerPaid,
    STAmount&           saTakerGot,
    bool&               bUnfunded)
{
    // The book has the most elements. Take the perspective of the book.
    // Book is ordered for taker: taker pays / taker gets (smaller is better)

    // The order is for the other books currencys for get and pays are opposites.
    // We want the same ratio for the respective currencies.
    // So we swap paid and gets for determing take quality.

    assert (saTakerPays && saTakerGets);

    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: bSell: " << bSell << ": against book: " << uBookBase.ToString ();

    LedgerEntrySet&         lesActive           = mEngine->getNodes ();
    uint256                 uTipIndex           = uBookBase;
    const uint256           uBookEnd            = Ledger::getQualityNext (uBookBase);
    const uint64            uTakeQuality        = STAmount::getRate (saTakerGets, saTakerPays);
    STAmount                saTakerRate         = STAmount::setRate (uTakeQuality);
    const uint160           uTakerPaysAccountID = saTakerPays.getIssuer ();
    const uint160           uTakerGetsAccountID = saTakerGets.getIssuer ();
    TER                     terResult           = temUNCERTAIN;

    boost::unordered_set<uint256>   usOfferUnfundedBecame;  // Offers that became unfunded.
    boost::unordered_set<uint160>   usAccountTouched;       // Accounts touched.

    saTakerPaid     = STAmount (saTakerPays.getCurrency (), saTakerPays.getIssuer ());
    saTakerGot      = STAmount (saTakerGets.getCurrency (), saTakerGets.getIssuer ());
    bUnfunded       = false;

    while (temUNCERTAIN == terResult)
    {
        SLE::pointer    sleOfferDir;
        uint64          uTipQuality     = 0;
        STAmount        saTakerFunds    = lesActive.accountFunds (uTakerAccountID, saTakerPays);
        STAmount        saSubTakerPays  = saTakerPays - saTakerPaid; // How much more to spend.
        STAmount        saSubTakerGets  = saTakerGets - saTakerGot; // How much more is wanted.

        // Figure out next offer to take, if needed.
        if (saTakerFunds.isPositive ()          // Taker has funds available.
                && saSubTakerPays.isPositive ()
                && saSubTakerGets.isPositive ())
        {
            sleOfferDir     = mEngine->entryCache (ltDIR_NODE, lesActive.getNextLedgerIndex (uTipIndex, uBookEnd));

            if (sleOfferDir)
            {
                uTipIndex       = sleOfferDir->getIndex ();
                uTipQuality     = Ledger::getQuality (uTipIndex);

                WriteLog (lsDEBUG, OfferCreateTransactor) << boost::str (boost::format ("takeOffers: possible counter offer found: uTipQuality=%d uTipIndex=%s")
                        % uTipQuality
                        % uTipIndex.ToString ());

            }
            else
            {
                WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: counter offer book is empty: "
                        << uTipIndex.ToString ()
                        << " ... "
                        << uBookEnd.ToString ();
            }
        }

        if (!saTakerFunds.isPositive ())                    // Taker has no funds.
        {
            // Done. Ran out of funds on previous round. As fees aren't calculated directly in this routine, funds are checked here.
            WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: done: taker unfunded.";

            bUnfunded   = true;                             // Don't create an order.
            terResult   = tesSUCCESS;
        }
        else if (!sleOfferDir                               // No offer directory to take.
                 || uTakeQuality < uTipQuality                   // No offers of sufficient quality available.
                 || (bPassive && uTakeQuality == uTipQuality))
        {
            // Done.
            STAmount    saTipRate           = sleOfferDir ? STAmount::setRate (uTipQuality) : saTakerRate;

            WriteLog (lsDEBUG, OfferCreateTransactor) << boost::str (boost::format ("takeOffers: done: dir=%d uTakeQuality=%d %c uTipQuality=%d saTakerRate=%s %c saTipRate=%s bPassive=%d")
                    % !!sleOfferDir
                    % uTakeQuality
                    % (uTakeQuality == uTipQuality
                       ? '='
                       : uTakeQuality < uTipQuality
                       ? '<'
                       : '>')
                    % uTipQuality
                    % saTakerRate
                    % (saTakerRate == saTipRate
                       ? '='
                       : saTakerRate < saTipRate
                       ? '<'
                       : '>')
                    % saTipRate
                    % bPassive);

            terResult   = tesSUCCESS;
        }
        else
        {
            // Have an offer directory to consider.
            WriteLog (lsTRACE, OfferCreateTransactor) << "takeOffers: considering dir: " << sleOfferDir->getJson (0);

            SLE::pointer    sleBookNode;
            unsigned int    uBookEntry;
            uint256         uOfferIndex;

            lesActive.dirFirst (uTipIndex, sleBookNode, uBookEntry, uOfferIndex);

            SLE::pointer    sleOffer        = mEngine->entryCache (ltOFFER, uOfferIndex);

            WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: considering offer : " << sleOffer->getJson (0);

            const uint160   uOfferOwnerID   = sleOffer->getFieldAccount160 (sfAccount);
            STAmount        saOfferPays     = sleOffer->getFieldAmount (sfTakerGets);
            STAmount        saOfferGets     = sleOffer->getFieldAmount (sfTakerPays);

            STAmount        saOfferFunds;   // Funds of offer owner to payout.
            bool            bValid;

            bValid  =  bValidOffer (
                           sleOfferDir, uOfferIndex, uOfferOwnerID, saOfferPays, saOfferGets,
                           uTakerAccountID,
                           usOfferUnfundedFound, usOfferUnfundedBecame, usAccountTouched,
                           saOfferFunds);

            if (bValid)
            {
                STAmount    saSubTakerPaid;
                STAmount    saSubTakerGot;
                STAmount    saTakerIssuerFee;
                STAmount    saOfferIssuerFee;
                STAmount    saOfferRate = STAmount::setRate (uTipQuality);

                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerPays: " << saTakerPays.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerPaid: " << saTakerPaid.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:   saTakerFunds: " << saTakerFunds.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:   saOfferFunds: " << saOfferFunds.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saOfferPays: " << saOfferPays.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saOfferGets: " << saOfferGets.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saOfferRate: " << saOfferRate.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer: saSubTakerPays: " << saSubTakerPays.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer: saSubTakerGets: " << saSubTakerGets.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerPays: " << saTakerPays.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerGets: " << saTakerGets.getFullText ();

                bool    bOfferDelete    = STAmount::applyOffer (
                                              bSell,
                                              lesActive.rippleTransferRate (uTakerAccountID, uOfferOwnerID, uTakerPaysAccountID),
                                              lesActive.rippleTransferRate (uOfferOwnerID, uTakerAccountID, uTakerGetsAccountID),
                                              saOfferRate,
                                              saOfferFunds,
                                              saTakerFunds,
                                              saOfferPays,
                                              saOfferGets,
                                              saSubTakerPays,
                                              saSubTakerGets,
                                              saSubTakerPaid,
                                              saSubTakerGot,
                                              saTakerIssuerFee,
                                              saOfferIssuerFee);

                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer: saSubTakerPaid: " << saSubTakerPaid.getFullText ();
                WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:  saSubTakerGot: " << saSubTakerGot.getFullText ();

                // Adjust offer

                // Offer owner will pay less.  Subtract what taker just got.
                sleOffer->setFieldAmount (sfTakerGets, saOfferPays -= saSubTakerGot);

                // Offer owner will get less.  Subtract what owner just paid.
                sleOffer->setFieldAmount (sfTakerPays, saOfferGets -= saSubTakerPaid);

                mEngine->entryModify (sleOffer);

                if (bOfferDelete)
                {
                    // Offer now fully claimed or now unfunded.
                    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: Offer claimed: Delete.";

                    usOfferUnfundedBecame.insert (uOfferIndex); // Delete unfunded offer on success.

                    // Offer owner's account is no longer pristine.
                    usAccountTouched.insert (uOfferOwnerID);
                }
                else if (saSubTakerGot)
                {
                    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: Offer partial claim.";

                    if (!saOfferPays.isPositive () || !saOfferGets.isPositive ())
                    {
                        WriteLog (lsWARNING, OfferCreateTransactor) << "takeOffers: ILLEGAL OFFER RESULT.";
                        bUnfunded   = true;
                        terResult   = bOpenLedger ? telFAILED_PROCESSING : tecFAILED_PROCESSING;
                    }
                }
                else
                {
                    // Taker got nothing, probably due to rounding. Consider taker unfunded.
                    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: No claim.";

                    bUnfunded   = true;
                    terResult   = tesSUCCESS;                   // Done.
                }

                assert (uTakerGetsAccountID == saSubTakerGot.getIssuer ());
                assert (uTakerPaysAccountID == saSubTakerPaid.getIssuer ());

                if (!bUnfunded)
                {
                    // Distribute funds. The sends charge appropriate fees which are implied by offer.

                    terResult   = lesActive.accountSend (uOfferOwnerID, uTakerAccountID, saSubTakerGot);            // Offer owner pays taker.

                    if (tesSUCCESS == terResult)
                        terResult   = lesActive.accountSend (uTakerAccountID, uOfferOwnerID, saSubTakerPaid);           // Taker pays offer owner.

                    if (!bSell)
                    {
                        // Buy semantics: Reduce amount considered paid by taker's rate. Not by actual cost which is lower.
                        // That is, take less as to just satify our buy requirement.
                        STAmount    saTakerCould    = saTakerPays - saTakerPaid;    // Taker could pay.

                        if (saTakerFunds < saTakerCould)
                            saTakerCould    = saTakerFunds;

                        STAmount    saTakerUsed = STAmount::multiply (saSubTakerGot, saTakerRate, saTakerPays);

                        WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:   saTakerCould: " << saTakerCould.getFullText ();
                        WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:  saSubTakerGot: " << saSubTakerGot.getFullText ();
                        WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerRate: " << saTakerRate.getFullText ();
                        WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: applyOffer:    saTakerUsed: " << saTakerUsed.getFullText ();

                        saSubTakerPaid  = std::min (saTakerCould, saTakerUsed);
                    }

                    saTakerPaid     += saSubTakerPaid;
                    saTakerGot      += saSubTakerGot;

                    if (tesSUCCESS == terResult)
                        terResult   = temUNCERTAIN;
                }
            }
        }
    }

    WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: " << transToken (terResult);

    if (tesSUCCESS == terResult)
    {
        // On success, delete offers that became unfunded.
        BOOST_FOREACH (uint256 const & uOfferIndex, usOfferUnfundedBecame)
        {
            WriteLog (lsDEBUG, OfferCreateTransactor) << "takeOffers: became unfunded: " << uOfferIndex.ToString ();

            terResult   = lesActive.offerDelete (uOfferIndex);

            if (tesSUCCESS != terResult)
                break;
        }
Exemplo n.º 5
0
// {
//   ledger_hash : <ledger>
//   ledger_index : <ledger_index>
//   ...
// }
Json::Value RPCHandler::doLedgerEntry (Json::Value params, Resource::Charge& loadType, Application::ScopedLockType& masterLockHolder)
{
    masterLockHolder.unlock ();

    Ledger::pointer     lpLedger;
    Json::Value         jvResult    = RPC::lookupLedger (params, lpLedger, *mNetOps);

    if (!lpLedger)
        return jvResult;

    uint256     uNodeIndex;
    bool        bNodeBinary = false;

    if (params.isMember ("index"))
    {
        // XXX Needs to provide proof.
        uNodeIndex.SetHex (params["index"].asString ());
        bNodeBinary = true;
    }
    else if (params.isMember ("account_root"))
    {
        RippleAddress   naAccount;

        if (!naAccount.setAccountID (params["account_root"].asString ())
                || !naAccount.getAccountID ())
        {
            jvResult["error"]   = "malformedAddress";
        }
        else
        {
            uNodeIndex = Ledger::getAccountRootIndex (naAccount.getAccountID ());
        }
    }
    else if (params.isMember ("directory"))
    {
        if (!params["directory"].isObject ())
        {
            uNodeIndex.SetHex (params["directory"].asString ());
        }
        else if (params["directory"].isMember ("sub_index")
                 && !params["directory"]["sub_index"].isIntegral ())
        {
            jvResult["error"]   = "malformedRequest";
        }
        else
        {
            std::uint64_t  uSubIndex = params["directory"].isMember ("sub_index")
                                ? params["directory"]["sub_index"].asUInt ()
                                : 0;

            if (params["directory"].isMember ("dir_root"))
            {
                uint256 uDirRoot;

                uDirRoot.SetHex (params["dir_root"].asString ());

                uNodeIndex  = Ledger::getDirNodeIndex (uDirRoot, uSubIndex);
            }
            else if (params["directory"].isMember ("owner"))
            {
                RippleAddress   naOwnerID;

                if (!naOwnerID.setAccountID (params["directory"]["owner"].asString ()))
                {
                    jvResult["error"]   = "malformedAddress";
                }
                else
                {
                    uint256 uDirRoot    = Ledger::getOwnerDirIndex (naOwnerID.getAccountID ());

                    uNodeIndex  = Ledger::getDirNodeIndex (uDirRoot, uSubIndex);
                }
            }
            else
            {
                jvResult["error"]   = "malformedRequest";
            }
        }
    }
    else if (params.isMember ("generator"))
    {
        RippleAddress   naGeneratorID;

        if (!params["generator"].isObject ())
        {
            uNodeIndex.SetHex (params["generator"].asString ());
        }
        else if (!params["generator"].isMember ("regular_seed"))
        {
            jvResult["error"]   = "malformedRequest";
        }
        else if (!naGeneratorID.setSeedGeneric (params["generator"]["regular_seed"].asString ()))
        {
            jvResult["error"]   = "malformedAddress";
        }
        else
        {
            RippleAddress       na0Public;      // To find the generator's index.
            RippleAddress       naGenerator = RippleAddress::createGeneratorPublic (naGeneratorID);

            na0Public.setAccountPublic (naGenerator, 0);

            uNodeIndex  = Ledger::getGeneratorIndex (na0Public.getAccountID ());
        }
    }
    else if (params.isMember ("offer"))
    {
        RippleAddress   naAccountID;

        if (!params["offer"].isObject ())
        {
            uNodeIndex.SetHex (params["offer"].asString ());
        }
        else if (!params["offer"].isMember ("account")
                 || !params["offer"].isMember ("seq")
                 || !params["offer"]["seq"].isIntegral ())
        {
            jvResult["error"]   = "malformedRequest";
        }
        else if (!naAccountID.setAccountID (params["offer"]["account"].asString ()))
        {
            jvResult["error"]   = "malformedAddress";
        }
        else
        {
            std::uint32_t      uSequence   = params["offer"]["seq"].asUInt ();

            uNodeIndex  = Ledger::getOfferIndex (naAccountID.getAccountID (), uSequence);
        }
    }
    else if (params.isMember ("ripple_state"))
    {
        RippleAddress   naA;
        RippleAddress   naB;
        uint160         uCurrency;
        Json::Value     jvRippleState   = params["ripple_state"];

        if (!jvRippleState.isObject ()
                || !jvRippleState.isMember ("currency")
                || !jvRippleState.isMember ("accounts")
                || !jvRippleState["accounts"].isArray ()
                || 2 != jvRippleState["accounts"].size ()
                || !jvRippleState["accounts"][0u].isString ()
                || !jvRippleState["accounts"][1u].isString ()
                || jvRippleState["accounts"][0u].asString () == jvRippleState["accounts"][1u].asString ()
           )
        {
            jvResult["error"]   = "malformedRequest";
        }
        else if (!naA.setAccountID (jvRippleState["accounts"][0u].asString ())
                 || !naB.setAccountID (jvRippleState["accounts"][1u].asString ()))
        {
            jvResult["error"]   = "malformedAddress";
        }
        else if (!STAmount::currencyFromString (uCurrency, jvRippleState["currency"].asString ()))
        {
            jvResult["error"]   = "malformedCurrency";
        }
        else
        {
            uNodeIndex  = Ledger::getRippleStateIndex (naA, naB, uCurrency);
        }
    }
    else
    {
        jvResult["error"]   = "unknownOption";
    }

    if (uNodeIndex.isNonZero ())
    {
        SLE::pointer    sleNode = mNetOps->getSLEi (lpLedger, uNodeIndex);

        if (params.isMember("binary"))
            bNodeBinary = params["binary"].asBool();

        if (!sleNode)
        {
            // Not found.
            // XXX Should also provide proof.
            jvResult["error"]       = "entryNotFound";
        }
        else if (bNodeBinary)
        {
            // XXX Should also provide proof.
            Serializer s;

            sleNode->add (s);

            jvResult["node_binary"] = strHex (s.peekData ());
            jvResult["index"]       = uNodeIndex.ToString ();
        }
        else
        {
            jvResult["node"]        = sleNode->getJson (0);
            jvResult["index"]       = uNodeIndex.ToString ();
        }
    }

    return jvResult;
}