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21c563f83a
The Owner count could decrease while evaluating a strand, causing different behavior in forward passes and reverses passes. The fix treats a decreased owner count like a deferred credit. In some situations, deferred credits could cause an XRP balance to be calculated as negative, triggering some asserts. When XRP is used as a bridge currency, a path could be falsely marked as dry. This happens when the XRP/XXX offer recursively checks the XXX/XRP offer and the XXX/XRP offer could not satisfy the request in a single call. With a single strand and limit quality the old payment code incorrectly computed with multiquailty set to true. This could cause the total quality to go below the requested quality even if there was liquidity available above the requested quality value.
87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include <BeastConfig.h>
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#include <ripple/ledger/ReadView.h>
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#include <ripple/protocol/AmountConversions.h>
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#include <ripple/protocol/STAmount.h>
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#include <ripple/protocol/Indexes.h>
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namespace ripple {
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STAmount
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creditLimit (
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ReadView const& view,
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AccountID const& account,
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AccountID const& issuer,
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Currency const& currency)
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{
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STAmount result ({currency, account});
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auto sleRippleState = view.read(
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keylet::line(account, issuer, currency));
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if (sleRippleState)
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{
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result = sleRippleState->getFieldAmount (
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account < issuer ? sfLowLimit : sfHighLimit);
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result.setIssuer (account);
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}
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assert (result.getIssuer () == account);
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assert (result.getCurrency () == currency);
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return result;
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}
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IOUAmount
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creditLimit2 (
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ReadView const& v,
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AccountID const& acc,
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AccountID const& iss,
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Currency const& cur)
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{
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return toAmount<IOUAmount> (creditLimit (v, acc, iss, cur));
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}
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STAmount creditBalance (
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ReadView const& view,
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AccountID const& account,
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AccountID const& issuer,
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Currency const& currency)
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{
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STAmount result ({currency, account});
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auto sleRippleState = view.read(
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keylet::line(account, issuer, currency));
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if (sleRippleState)
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{
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result = sleRippleState->getFieldAmount (sfBalance);
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if (account < issuer)
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result.negate ();
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result.setIssuer (account);
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}
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assert (result.getIssuer () == account);
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assert (result.getCurrency () == currency);
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return result;
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}
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} // ripple
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