TER SetTrust::doApply () { TER terResult = tesSUCCESS; STAmount const saLimitAmount (mTxn.getFieldAmount (sfLimitAmount)); bool const bQualityIn (mTxn.isFieldPresent (sfQualityIn)); bool const bQualityOut (mTxn.isFieldPresent (sfQualityOut)); Currency const currency (saLimitAmount.getCurrency ()); Account uDstAccountID (saLimitAmount.getIssuer ()); // true, iff current is high account. bool const bHigh = mTxnAccountID > uDstAccountID; std::uint32_t uQualityIn (bQualityIn ? mTxn.getFieldU32 (sfQualityIn) : 0); std::uint32_t uQualityOut (bQualityOut ? mTxn.getFieldU32 (sfQualityOut) : 0); if (!saLimitAmount.isLegalNet ()) return temBAD_AMOUNT; if (bQualityIn && QUALITY_ONE == uQualityIn) uQualityIn = 0; if (bQualityOut && QUALITY_ONE == uQualityOut) uQualityOut = 0; std::uint32_t const uTxFlags = mTxn.getFlags (); if (uTxFlags & tfTrustSetMask) { m_journal.trace << "Malformed transaction: Invalid flags set."; return temINVALID_FLAG; } bool const bSetAuth = (uTxFlags & tfSetfAuth); bool const bSetNoRipple = (uTxFlags & tfSetNoRipple); bool const bClearNoRipple = (uTxFlags & tfClearNoRipple); bool const bSetFreeze = (uTxFlags & tfSetFreeze); bool const bClearFreeze = (uTxFlags & tfClearFreeze); if (bSetAuth && !(mTxnAccount->getFieldU32 (sfFlags) & lsfRequireAuth)) { m_journal.trace << "Retry: Auth not required."; return tefNO_AUTH_REQUIRED; } if (saLimitAmount.isNative ()) { m_journal.trace << "Malformed transaction: Native credit limit: " << saLimitAmount.getFullText (); return temBAD_LIMIT; } if (saLimitAmount < zero) { m_journal.trace << "Malformed transaction: Negative credit limit."; return temBAD_LIMIT; } // Check if destination makes sense. if (!uDstAccountID || uDstAccountID == noAccount()) { m_journal.trace << "Malformed transaction: Destination account not specified."; return temDST_NEEDED; } if (mTxnAccountID == uDstAccountID) { SLE::pointer selDelete ( mEngine->entryCache (ltRIPPLE_STATE, Ledger::getRippleStateIndex ( mTxnAccountID, uDstAccountID, currency))); if (selDelete) { m_journal.warning << "Clearing redundant line."; return mEngine->view ().trustDelete ( selDelete, mTxnAccountID, uDstAccountID); } else { m_journal.trace << "Malformed transaction: Can not extend credit to self."; return temDST_IS_SRC; } } SLE::pointer sleDst (mEngine->entryCache ( ltACCOUNT_ROOT, Ledger::getAccountRootIndex (uDstAccountID))); if (!sleDst) { m_journal.trace << "Delay transaction: Destination account does not exist."; return tecNO_DST; } std::uint32_t const uOwnerCount (mTxnAccount->getFieldU32 (sfOwnerCount)); // The reserve required to create the line. std::uint64_t const uReserveCreate = (uOwnerCount < 2) ? 0 : mEngine->getLedger ()->getReserve (uOwnerCount + 1); STAmount saLimitAllow = saLimitAmount; saLimitAllow.setIssuer (mTxnAccountID); SLE::pointer sleRippleState (mEngine->entryCache (ltRIPPLE_STATE, Ledger::getRippleStateIndex (mTxnAccountID, uDstAccountID, currency))); if (sleRippleState) { STAmount saLowBalance; STAmount saLowLimit; STAmount saHighBalance; STAmount saHighLimit; std::uint32_t uLowQualityIn; std::uint32_t uLowQualityOut; std::uint32_t uHighQualityIn; std::uint32_t uHighQualityOut; auto const& uLowAccountID = !bHigh ? mTxnAccountID : uDstAccountID; auto const& uHighAccountID = bHigh ? mTxnAccountID : uDstAccountID; SLE::ref sleLowAccount = !bHigh ? mTxnAccount : sleDst; SLE::ref sleHighAccount = bHigh ? mTxnAccount : sleDst; // // Balances // saLowBalance = sleRippleState->getFieldAmount (sfBalance); saHighBalance = -saLowBalance; // // Limits // sleRippleState->setFieldAmount (!bHigh ? sfLowLimit : sfHighLimit, saLimitAllow); saLowLimit = !bHigh ? saLimitAllow : sleRippleState->getFieldAmount (sfLowLimit); saHighLimit = bHigh ? saLimitAllow : sleRippleState->getFieldAmount (sfHighLimit); // // Quality in // if (!bQualityIn) { // Not setting. Just get it. uLowQualityIn = sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = sleRippleState->getFieldU32 (sfHighQualityIn); } else if (uQualityIn) { // Setting. sleRippleState->setFieldU32 (!bHigh ? sfLowQualityIn : sfHighQualityIn, uQualityIn); uLowQualityIn = !bHigh ? uQualityIn : sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = bHigh ? uQualityIn : sleRippleState->getFieldU32 (sfHighQualityIn); } else { // Clearing. sleRippleState->makeFieldAbsent (!bHigh ? sfLowQualityIn : sfHighQualityIn); uLowQualityIn = !bHigh ? 0 : sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = bHigh ? 0 : sleRippleState->getFieldU32 (sfHighQualityIn); } if (QUALITY_ONE == uLowQualityIn) uLowQualityIn = 0; if (QUALITY_ONE == uHighQualityIn) uHighQualityIn = 0; // // Quality out // if (!bQualityOut) { // Not setting. Just get it. uLowQualityOut = sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = sleRippleState->getFieldU32 (sfHighQualityOut); } else if (uQualityOut) { // Setting. sleRippleState->setFieldU32 (!bHigh ? sfLowQualityOut : sfHighQualityOut, uQualityOut); uLowQualityOut = !bHigh ? uQualityOut : sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = bHigh ? uQualityOut : sleRippleState->getFieldU32 (sfHighQualityOut); } else { // Clearing. sleRippleState->makeFieldAbsent (!bHigh ? sfLowQualityOut : sfHighQualityOut); uLowQualityOut = !bHigh ? 0 : sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = bHigh ? 0 : sleRippleState->getFieldU32 (sfHighQualityOut); } std::uint32_t const uFlagsIn (sleRippleState->getFieldU32 (sfFlags)); std::uint32_t uFlagsOut (uFlagsIn); if (bSetNoRipple && !bClearNoRipple && (bHigh ? saHighBalance : saLowBalance) >= zero) { uFlagsOut |= (bHigh ? lsfHighNoRipple : lsfLowNoRipple); } else if (bClearNoRipple && !bSetNoRipple) { uFlagsOut &= ~(bHigh ? lsfHighNoRipple : lsfLowNoRipple); } if (bSetFreeze && !bClearFreeze && !mTxnAccount->isFlag (lsfNoFreeze)) { uFlagsOut |= (bHigh ? lsfHighFreeze : lsfLowFreeze); } else if (bClearFreeze && !bSetFreeze) { uFlagsOut &= ~(bHigh ? lsfHighFreeze : lsfLowFreeze); } if (QUALITY_ONE == uLowQualityOut) uLowQualityOut = 0; if (QUALITY_ONE == uHighQualityOut) uHighQualityOut = 0; bool const bLowReserveSet = uLowQualityIn || uLowQualityOut || (uFlagsOut & lsfLowNoRipple) || (uFlagsOut & lsfLowFreeze) || saLowLimit || saLowBalance > zero; bool const bLowReserveClear = !bLowReserveSet; bool const bHighReserveSet = uHighQualityIn || uHighQualityOut || (uFlagsOut & lsfHighNoRipple) || (uFlagsOut & lsfHighFreeze) || saHighLimit || saHighBalance > zero; bool const bHighReserveClear = !bHighReserveSet; bool const bDefault = bLowReserveClear && bHighReserveClear; bool const bLowReserved = (uFlagsIn & lsfLowReserve); bool const bHighReserved = (uFlagsIn & lsfHighReserve); bool bReserveIncrease = false; if (bSetAuth) { uFlagsOut |= (bHigh ? lsfHighAuth : lsfLowAuth); } if (bLowReserveSet && !bLowReserved) { // Set reserve for low account. mEngine->view ().ownerCountAdjust (uLowAccountID, 1, sleLowAccount); uFlagsOut |= lsfLowReserve; if (!bHigh) bReserveIncrease = true; } if (bLowReserveClear && bLowReserved) { // Clear reserve for low account. mEngine->view ().ownerCountAdjust (uLowAccountID, -1, sleLowAccount); uFlagsOut &= ~lsfLowReserve; } if (bHighReserveSet && !bHighReserved) { // Set reserve for high account. mEngine->view ().ownerCountAdjust (uHighAccountID, 1, sleHighAccount); uFlagsOut |= lsfHighReserve; if (bHigh) bReserveIncrease = true; } if (bHighReserveClear && bHighReserved) { // Clear reserve for high account. mEngine->view ().ownerCountAdjust (uHighAccountID, -1, sleHighAccount); uFlagsOut &= ~lsfHighReserve; } if (uFlagsIn != uFlagsOut) sleRippleState->setFieldU32 (sfFlags, uFlagsOut); if (bDefault || badCurrency() == currency) { // Delete. terResult = mEngine->view ().trustDelete (sleRippleState, uLowAccountID, uHighAccountID); } else if (bReserveIncrease && mPriorBalance.getNValue () < uReserveCreate) // Reserve is not scaled by load. { m_journal.trace << "Delay transaction: Insufficent reserve to add trust line."; // Another transaction could provide XRP to the account and then // this transaction would succeed. terResult = tecINSUF_RESERVE_LINE; } else { mEngine->entryModify (sleRippleState); m_journal.trace << "Modify ripple line"; } } // Line does not exist. else if (!saLimitAmount // Setting default limit. && (!bQualityIn || !uQualityIn) // Not setting quality in or setting default quality in. && (!bQualityOut || !uQualityOut)) // Not setting quality out or setting default quality out. { m_journal.trace << "Redundant: Setting non-existent ripple line to defaults."; return tecNO_LINE_REDUNDANT; } else if (mPriorBalance.getNValue () < uReserveCreate) // Reserve is not scaled by load. { m_journal.trace << "Delay transaction: Line does not exist. Insufficent reserve to create line."; // Another transaction could create the account and then this transaction would succeed. terResult = tecNO_LINE_INSUF_RESERVE; } else if (badCurrency() == currency) { terResult = temBAD_CURRENCY; } else { // Zero balance in currency. STAmount saBalance ({currency, noAccount()}); uint256 index (Ledger::getRippleStateIndex ( mTxnAccountID, uDstAccountID, currency)); m_journal.trace << "doTrustSet: Creating ripple line: " << to_string (index); // Create a new ripple line. terResult = mEngine->view ().trustCreate ( bHigh, mTxnAccountID, uDstAccountID, index, mTxnAccount, bSetAuth, bSetNoRipple && !bClearNoRipple, bSetFreeze && !bClearFreeze, saBalance, saLimitAllow, // Limit for who is being charged. uQualityIn, uQualityOut); } return terResult; }
TER TrustSetTransactor::doApply () { TER terResult = tesSUCCESS; WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet>"; const STAmount saLimitAmount = mTxn.getFieldAmount (sfLimitAmount); const bool bQualityIn = mTxn.isFieldPresent (sfQualityIn); const bool bQualityOut = mTxn.isFieldPresent (sfQualityOut); const uint160 uCurrencyID = saLimitAmount.getCurrency (); uint160 uDstAccountID = saLimitAmount.getIssuer (); const bool bHigh = mTxnAccountID > uDstAccountID; // true, iff current is high account. uint32 uQualityIn = bQualityIn ? mTxn.getFieldU32 (sfQualityIn) : 0; uint32 uQualityOut = bQualityOut ? mTxn.getFieldU32 (sfQualityOut) : 0; if (!saLimitAmount.isLegalNet ()) return temBAD_AMOUNT; if (bQualityIn && QUALITY_ONE == uQualityIn) uQualityIn = 0; if (bQualityOut && QUALITY_ONE == uQualityOut) uQualityOut = 0; const uint32 uTxFlags = mTxn.getFlags (); if (uTxFlags & tfTrustSetMask) { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Malformed transaction: Invalid flags set."; return temINVALID_FLAG; } const bool bSetAuth = isSetBit (uTxFlags, tfSetfAuth); const bool bSetNoRipple = isSetBit (uTxFlags, tfSetNoRipple); const bool bClearNoRipple = isSetBit (uTxFlags, tfClearNoRipple); if (bSetAuth && !isSetBit (mTxnAccount->getFieldU32 (sfFlags), lsfRequireAuth)) { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Retry: Auth not required."; return tefNO_AUTH_REQUIRED; } if (saLimitAmount.isNative ()) { WriteLog (lsINFO, TrustSetTransactor) << boost::str (boost::format ("doTrustSet: Malformed transaction: Native credit limit: %s") % saLimitAmount.getFullText ()); return temBAD_LIMIT; } if (saLimitAmount.isNegative ()) { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Malformed transaction: Negative credit limit."; return temBAD_LIMIT; } // Check if destination makes sense. if (!uDstAccountID || uDstAccountID == ACCOUNT_ONE) { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Malformed transaction: Destination account not specified."; return temDST_NEEDED; } if (mTxnAccountID == uDstAccountID) { SLE::pointer selDelete = mEngine->entryCache (ltRIPPLE_STATE, Ledger::getRippleStateIndex (mTxnAccountID, uDstAccountID, uCurrencyID)); if (selDelete) { WriteLog (lsWARNING, TrustSetTransactor) << "doTrustSet: Clearing redundant line."; return mEngine->getNodes ().trustDelete (selDelete, mTxnAccountID, uDstAccountID); } else { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Malformed transaction: Can not extend credit to self."; return temDST_IS_SRC; } } SLE::pointer sleDst = mEngine->entryCache (ltACCOUNT_ROOT, Ledger::getAccountRootIndex (uDstAccountID)); if (!sleDst) { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Delay transaction: Destination account does not exist."; return tecNO_DST; } const uint32 uOwnerCount = mTxnAccount->getFieldU32 (sfOwnerCount); // The reserve required to create the line. const uint64 uReserveCreate = (uOwnerCount < 2) ? 0 : mEngine->getLedger ()->getReserve (uOwnerCount + 1); STAmount saLimitAllow = saLimitAmount; saLimitAllow.setIssuer (mTxnAccountID); SLE::pointer sleRippleState = mEngine->entryCache (ltRIPPLE_STATE, Ledger::getRippleStateIndex (mTxnAccountID, uDstAccountID, uCurrencyID)); if (sleRippleState) { STAmount saLowBalance; STAmount saLowLimit; STAmount saHighBalance; STAmount saHighLimit; uint32 uLowQualityIn; uint32 uLowQualityOut; uint32 uHighQualityIn; uint32 uHighQualityOut; const uint160& uLowAccountID = !bHigh ? mTxnAccountID : uDstAccountID; const uint160& uHighAccountID = bHigh ? mTxnAccountID : uDstAccountID; SLE::ref sleLowAccount = !bHigh ? mTxnAccount : sleDst; SLE::ref sleHighAccount = bHigh ? mTxnAccount : sleDst; // // Balances // saLowBalance = sleRippleState->getFieldAmount (sfBalance); saHighBalance = -saLowBalance; // // Limits // sleRippleState->setFieldAmount (!bHigh ? sfLowLimit : sfHighLimit, saLimitAllow); saLowLimit = !bHigh ? saLimitAllow : sleRippleState->getFieldAmount (sfLowLimit); saHighLimit = bHigh ? saLimitAllow : sleRippleState->getFieldAmount (sfHighLimit); // // Quality in // if (!bQualityIn) { // Not setting. Just get it. uLowQualityIn = sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = sleRippleState->getFieldU32 (sfHighQualityIn); } else if (uQualityIn) { // Setting. sleRippleState->setFieldU32 (!bHigh ? sfLowQualityIn : sfHighQualityIn, uQualityIn); uLowQualityIn = !bHigh ? uQualityIn : sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = bHigh ? uQualityIn : sleRippleState->getFieldU32 (sfHighQualityIn); } else { // Clearing. sleRippleState->makeFieldAbsent (!bHigh ? sfLowQualityIn : sfHighQualityIn); uLowQualityIn = !bHigh ? 0 : sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = bHigh ? 0 : sleRippleState->getFieldU32 (sfHighQualityIn); } if (QUALITY_ONE == uLowQualityIn) uLowQualityIn = 0; if (QUALITY_ONE == uHighQualityIn) uHighQualityIn = 0; // // Quality out // if (!bQualityOut) { // Not setting. Just get it. uLowQualityOut = sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = sleRippleState->getFieldU32 (sfHighQualityOut); } else if (uQualityOut) { // Setting. sleRippleState->setFieldU32 (!bHigh ? sfLowQualityOut : sfHighQualityOut, uQualityOut); uLowQualityOut = !bHigh ? uQualityOut : sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = bHigh ? uQualityOut : sleRippleState->getFieldU32 (sfHighQualityOut); } else { // Clearing. sleRippleState->makeFieldAbsent (!bHigh ? sfLowQualityOut : sfHighQualityOut); uLowQualityOut = !bHigh ? 0 : sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = bHigh ? 0 : sleRippleState->getFieldU32 (sfHighQualityOut); } const uint32 uFlagsIn = sleRippleState->getFieldU32 (sfFlags); uint32 uFlagsOut = uFlagsIn; if (bSetNoRipple && !bClearNoRipple && (bHigh ? saHighBalance : saLowBalance).isGEZero()) { uFlagsOut |= (bHigh ? lsfHighNoRipple : lsfLowNoRipple); } else if (bClearNoRipple && !bSetNoRipple) { uFlagsOut &= ~(bHigh ? lsfHighNoRipple : lsfLowNoRipple); } if (QUALITY_ONE == uLowQualityOut) uLowQualityOut = 0; if (QUALITY_ONE == uHighQualityOut) uHighQualityOut = 0; const bool bLowReserveSet = uLowQualityIn || uLowQualityOut || isSetBit (uFlagsOut, lsfLowNoRipple) || !!saLowLimit || saLowBalance.isPositive (); const bool bLowReserveClear = !bLowReserveSet; const bool bHighReserveSet = uHighQualityIn || uHighQualityOut || isSetBit (uFlagsOut, lsfHighNoRipple) || !!saHighLimit || saHighBalance.isPositive (); const bool bHighReserveClear = !bHighReserveSet; const bool bDefault = bLowReserveClear && bHighReserveClear; const bool bLowReserved = isSetBit (uFlagsIn, lsfLowReserve); const bool bHighReserved = isSetBit (uFlagsIn, lsfHighReserve); bool bReserveIncrease = false; if (bSetAuth) { uFlagsOut |= (bHigh ? lsfHighAuth : lsfLowAuth); } if (bLowReserveSet && !bLowReserved) { // Set reserve for low account. mEngine->getNodes ().ownerCountAdjust (uLowAccountID, 1, sleLowAccount); uFlagsOut |= lsfLowReserve; if (!bHigh) bReserveIncrease = true; } if (bLowReserveClear && bLowReserved) { // Clear reserve for low account. mEngine->getNodes ().ownerCountAdjust (uLowAccountID, -1, sleLowAccount); uFlagsOut &= ~lsfLowReserve; } if (bHighReserveSet && !bHighReserved) { // Set reserve for high account. mEngine->getNodes ().ownerCountAdjust (uHighAccountID, 1, sleHighAccount); uFlagsOut |= lsfHighReserve; if (bHigh) bReserveIncrease = true; } if (bHighReserveClear && bHighReserved) { // Clear reserve for high account. mEngine->getNodes ().ownerCountAdjust (uHighAccountID, -1, sleHighAccount); uFlagsOut &= ~lsfHighReserve; } if (uFlagsIn != uFlagsOut) sleRippleState->setFieldU32 (sfFlags, uFlagsOut); if (bDefault || CURRENCY_BAD == uCurrencyID) { // Delete. terResult = mEngine->getNodes ().trustDelete (sleRippleState, uLowAccountID, uHighAccountID); } else if (bReserveIncrease && mPriorBalance.getNValue () < uReserveCreate) // Reserve is not scaled by load. { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Delay transaction: Insufficent reserve to add trust line."; // Another transaction could provide XRP to the account and then this transaction would succeed. terResult = tecINSUF_RESERVE_LINE; } else { mEngine->entryModify (sleRippleState); WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Modify ripple line"; } } // Line does not exist. else if (!saLimitAmount // Setting default limit. && (!bQualityIn || !uQualityIn) // Not setting quality in or setting default quality in. && (!bQualityOut || !uQualityOut)) // Not setting quality out or setting default quality out. { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Redundant: Setting non-existent ripple line to defaults."; return tecNO_LINE_REDUNDANT; } else if (mPriorBalance.getNValue () < uReserveCreate) // Reserve is not scaled by load. { WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Delay transaction: Line does not exist. Insufficent reserve to create line."; // Another transaction could create the account and then this transaction would succeed. terResult = tecNO_LINE_INSUF_RESERVE; } else if (CURRENCY_BAD == uCurrencyID) { terResult = temBAD_CURRENCY; } else { STAmount saBalance = STAmount (uCurrencyID, ACCOUNT_ONE); // Zero balance in currency. WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet: Creating ripple line: " << Ledger::getRippleStateIndex (mTxnAccountID, uDstAccountID, uCurrencyID).ToString (); // Create a new ripple line. terResult = mEngine->getNodes ().trustCreate ( bHigh, mTxnAccountID, uDstAccountID, Ledger::getRippleStateIndex (mTxnAccountID, uDstAccountID, uCurrencyID), mTxnAccount, bSetAuth, bSetNoRipple && !bClearNoRipple, saBalance, saLimitAllow, // Limit for who is being charged. uQualityIn, uQualityOut); } WriteLog (lsINFO, TrustSetTransactor) << "doTrustSet<"; return terResult; }
TER SetTrust::doApply () { TER terResult = tesSUCCESS; STAmount const saLimitAmount (tx().getFieldAmount (sfLimitAmount)); bool const bQualityIn (tx().isFieldPresent (sfQualityIn)); bool const bQualityOut (tx().isFieldPresent (sfQualityOut)); Currency const currency (saLimitAmount.getCurrency ()); AccountID uDstAccountID (saLimitAmount.getIssuer ()); // true, iff current is high account. bool const bHigh = account_ > uDstAccountID; auto const sle = view().peek( keylet::account(account_)); std::uint32_t const uOwnerCount = sle->getFieldU32 (sfOwnerCount); // The reserve required to create the line. Note that we allow up to // two trust lines without requiring a reserve because being able to // exchange currencies is a powerful Ripple feature. // // This is also a security feature: if you're a gateway and you want to // be able to let someone use your services, you would otherwise have to // give them enough XRP to cover the incremental reserve for their trust // line. If they had no intention of using your services, they could use // the XRP for their own purposes. So we make it possible for gateways // to fund accounts in a way where there's no incentive to trick them // into creating an account you have no intention of using. XRPAmount const reserveCreate ((uOwnerCount < 2) ? XRPAmount (zero) : view().fees().accountReserve(uOwnerCount + 1)); std::uint32_t uQualityIn (bQualityIn ? tx().getFieldU32 (sfQualityIn) : 0); std::uint32_t uQualityOut (bQualityOut ? tx().getFieldU32 (sfQualityOut) : 0); if (bQualityOut && QUALITY_ONE == uQualityOut) uQualityOut = 0; std::uint32_t const uTxFlags = tx().getFlags (); bool const bSetAuth = (uTxFlags & tfSetfAuth); bool const bSetNoRipple = (uTxFlags & tfSetNoRipple); bool const bClearNoRipple = (uTxFlags & tfClearNoRipple); bool const bSetFreeze = (uTxFlags & tfSetFreeze); bool const bClearFreeze = (uTxFlags & tfClearFreeze); auto viewJ = ctx_.app.journal ("View"); if (bSetAuth && !(sle->getFieldU32 (sfFlags) & lsfRequireAuth)) { j_.trace << "Retry: Auth not required."; return tefNO_AUTH_REQUIRED; } if (account_ == uDstAccountID) { // The only purpose here is to allow a mistakenly created // trust line to oneself to be deleted. If no such trust // lines exist now, why not remove this code and simply // return an error? SLE::pointer sleDelete = view().peek ( keylet::line(account_, uDstAccountID, currency)); if (sleDelete) { j_.warning << "Clearing redundant line."; return trustDelete (view(), sleDelete, account_, uDstAccountID, viewJ); } else { j_.trace << "Malformed transaction: Can not extend credit to self."; return temDST_IS_SRC; } } SLE::pointer sleDst = view().peek (keylet::account(uDstAccountID)); if (!sleDst) { j_.trace << "Delay transaction: Destination account does not exist."; return tecNO_DST; } STAmount saLimitAllow = saLimitAmount; saLimitAllow.setIssuer (account_); SLE::pointer sleRippleState = view().peek ( keylet::line(account_, uDstAccountID, currency)); if (sleRippleState) { STAmount saLowBalance; STAmount saLowLimit; STAmount saHighBalance; STAmount saHighLimit; std::uint32_t uLowQualityIn; std::uint32_t uLowQualityOut; std::uint32_t uHighQualityIn; std::uint32_t uHighQualityOut; auto const& uLowAccountID = !bHigh ? account_ : uDstAccountID; auto const& uHighAccountID = bHigh ? account_ : uDstAccountID; SLE::ref sleLowAccount = !bHigh ? sle : sleDst; SLE::ref sleHighAccount = bHigh ? sle : sleDst; // // Balances // saLowBalance = sleRippleState->getFieldAmount (sfBalance); saHighBalance = -saLowBalance; // // Limits // sleRippleState->setFieldAmount (!bHigh ? sfLowLimit : sfHighLimit, saLimitAllow); saLowLimit = !bHigh ? saLimitAllow : sleRippleState->getFieldAmount (sfLowLimit); saHighLimit = bHigh ? saLimitAllow : sleRippleState->getFieldAmount (sfHighLimit); // // Quality in // if (!bQualityIn) { // Not setting. Just get it. uLowQualityIn = sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = sleRippleState->getFieldU32 (sfHighQualityIn); } else if (uQualityIn) { // Setting. sleRippleState->setFieldU32 (!bHigh ? sfLowQualityIn : sfHighQualityIn, uQualityIn); uLowQualityIn = !bHigh ? uQualityIn : sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = bHigh ? uQualityIn : sleRippleState->getFieldU32 (sfHighQualityIn); } else { // Clearing. sleRippleState->makeFieldAbsent (!bHigh ? sfLowQualityIn : sfHighQualityIn); uLowQualityIn = !bHigh ? 0 : sleRippleState->getFieldU32 (sfLowQualityIn); uHighQualityIn = bHigh ? 0 : sleRippleState->getFieldU32 (sfHighQualityIn); } if (QUALITY_ONE == uLowQualityIn) uLowQualityIn = 0; if (QUALITY_ONE == uHighQualityIn) uHighQualityIn = 0; // // Quality out // if (!bQualityOut) { // Not setting. Just get it. uLowQualityOut = sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = sleRippleState->getFieldU32 (sfHighQualityOut); } else if (uQualityOut) { // Setting. sleRippleState->setFieldU32 (!bHigh ? sfLowQualityOut : sfHighQualityOut, uQualityOut); uLowQualityOut = !bHigh ? uQualityOut : sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = bHigh ? uQualityOut : sleRippleState->getFieldU32 (sfHighQualityOut); } else { // Clearing. sleRippleState->makeFieldAbsent (!bHigh ? sfLowQualityOut : sfHighQualityOut); uLowQualityOut = !bHigh ? 0 : sleRippleState->getFieldU32 (sfLowQualityOut); uHighQualityOut = bHigh ? 0 : sleRippleState->getFieldU32 (sfHighQualityOut); } std::uint32_t const uFlagsIn (sleRippleState->getFieldU32 (sfFlags)); std::uint32_t uFlagsOut (uFlagsIn); if (bSetNoRipple && !bClearNoRipple && (bHigh ? saHighBalance : saLowBalance) >= zero) { uFlagsOut |= (bHigh ? lsfHighNoRipple : lsfLowNoRipple); } else if (bClearNoRipple && !bSetNoRipple) { uFlagsOut &= ~(bHigh ? lsfHighNoRipple : lsfLowNoRipple); } if (bSetFreeze && !bClearFreeze && !sle->isFlag (lsfNoFreeze)) { uFlagsOut |= (bHigh ? lsfHighFreeze : lsfLowFreeze); } else if (bClearFreeze && !bSetFreeze) { uFlagsOut &= ~(bHigh ? lsfHighFreeze : lsfLowFreeze); } if (QUALITY_ONE == uLowQualityOut) uLowQualityOut = 0; if (QUALITY_ONE == uHighQualityOut) uHighQualityOut = 0; bool const bLowDefRipple = sleLowAccount->getFlags() & lsfDefaultRipple; bool const bHighDefRipple = sleHighAccount->getFlags() & lsfDefaultRipple; bool const bLowReserveSet = uLowQualityIn || uLowQualityOut || ((uFlagsOut & lsfLowNoRipple) == 0) != bLowDefRipple || (uFlagsOut & lsfLowFreeze) || saLowLimit || saLowBalance > zero; bool const bLowReserveClear = !bLowReserveSet; bool const bHighReserveSet = uHighQualityIn || uHighQualityOut || ((uFlagsOut & lsfHighNoRipple) == 0) != bHighDefRipple || (uFlagsOut & lsfHighFreeze) || saHighLimit || saHighBalance > zero; bool const bHighReserveClear = !bHighReserveSet; bool const bDefault = bLowReserveClear && bHighReserveClear; bool const bLowReserved = (uFlagsIn & lsfLowReserve); bool const bHighReserved = (uFlagsIn & lsfHighReserve); bool bReserveIncrease = false; if (bSetAuth) { uFlagsOut |= (bHigh ? lsfHighAuth : lsfLowAuth); } if (bLowReserveSet && !bLowReserved) { // Set reserve for low account. adjustOwnerCount(view(), sleLowAccount, 1, viewJ); uFlagsOut |= lsfLowReserve; if (!bHigh) bReserveIncrease = true; } if (bLowReserveClear && bLowReserved) { // Clear reserve for low account. adjustOwnerCount(view(), sleLowAccount, -1, viewJ); uFlagsOut &= ~lsfLowReserve; } if (bHighReserveSet && !bHighReserved) { // Set reserve for high account. adjustOwnerCount(view(), sleHighAccount, 1, viewJ); uFlagsOut |= lsfHighReserve; if (bHigh) bReserveIncrease = true; } if (bHighReserveClear && bHighReserved) { // Clear reserve for high account. adjustOwnerCount(view(), sleHighAccount, -1, viewJ); uFlagsOut &= ~lsfHighReserve; } if (uFlagsIn != uFlagsOut) sleRippleState->setFieldU32 (sfFlags, uFlagsOut); if (bDefault || badCurrency() == currency) { // Delete. terResult = trustDelete (view(), sleRippleState, uLowAccountID, uHighAccountID, viewJ); } // Reserve is not scaled by load. else if (bReserveIncrease && mPriorBalance < reserveCreate) { j_.trace << "Delay transaction: Insufficent reserve to add trust line."; // Another transaction could provide XRP to the account and then // this transaction would succeed. terResult = tecINSUF_RESERVE_LINE; } else { view().update (sleRippleState); j_.trace << "Modify ripple line"; } } // Line does not exist. else if (! saLimitAmount && // Setting default limit. (! bQualityIn || ! uQualityIn) && // Not setting quality in or setting default quality in. (! bQualityOut || ! uQualityOut) && // Not setting quality out or setting default quality out. (! ((view().flags() & tapENABLE_TESTING) || view().rules().enabled(featureTrustSetAuth, ctx_.config.features)) || ! bSetAuth)) { j_.trace << "Redundant: Setting non-existent ripple line to defaults."; return tecNO_LINE_REDUNDANT; } else if (mPriorBalance < reserveCreate) // Reserve is not scaled by load. { j_.trace << "Delay transaction: Line does not exist. Insufficent reserve to create line."; // Another transaction could create the account and then this transaction would succeed. terResult = tecNO_LINE_INSUF_RESERVE; } else { // Zero balance in currency. STAmount saBalance ({currency, noAccount()}); uint256 index (getRippleStateIndex ( account_, uDstAccountID, currency)); j_.trace << "doTrustSet: Creating ripple line: " << to_string (index); // Create a new ripple line. terResult = trustCreate (view(), bHigh, account_, uDstAccountID, index, sle, bSetAuth, bSetNoRipple && !bClearNoRipple, bSetFreeze && !bClearFreeze, saBalance, saLimitAllow, // Limit for who is being charged. uQualityIn, uQualityOut, viewJ); } return terResult; }