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https://github.com/XRPLF/rippled.git
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600 lines
22 KiB
C++
600 lines
22 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 <ripple/app/paths/Credit.h>
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#include <ripple/app/paths/cursor/RippleLiquidity.h>
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#include <ripple/basics/Log.h>
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#include <ripple/protocol/Quality.h>
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namespace ripple {
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namespace path {
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// Calculate saPrvRedeemReq, saPrvIssueReq, saPrvDeliver from saCur, based on
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// required deliverable, propagate redeem, issue (for accounts) and deliver
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// requests (for order books) to the previous node.
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//
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// Inflate amount requested by required fees.
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// Reedems are limited based on IOUs previous has on hand.
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// Issues are limited based on credit limits and amount owed.
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//
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// Currency cannot be XRP because we are rippling.
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//
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// No permanent account balance adjustments as we don't know how much is going
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// to actually be pushed through yet - changes are only in the scratch pad
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// ledger.
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//
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// <-- tesSUCCESS or tecPATH_DRY
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TER PathCursor::reverseLiquidityForAccount () const
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{
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TER terResult = tesSUCCESS;
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auto const lastNodeIndex = nodeSize () - 1;
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auto const isFinalNode = (nodeIndex_ == lastNodeIndex);
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// 0 quality means none has yet been determined.
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std::uint64_t uRateMax = 0;
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// Current is allowed to redeem to next.
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const bool previousNodeIsAccount = !nodeIndex_ ||
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previousNode().isAccount();
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const bool nextNodeIsAccount = isFinalNode || nextNode().isAccount();
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AccountID const& previousAccountID = previousNodeIsAccount
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? previousNode().account_ : node().account_;
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AccountID const& nextAccountID = nextNodeIsAccount ? nextNode().account_
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: node().account_; // Offers are always issue.
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// This is the quality from from the previous node to this one.
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auto const qualityIn
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= (nodeIndex_ != 0)
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? quality_in (view(),
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node().account_,
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previousAccountID,
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node().issue_.currency)
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: parityRate;
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// And this is the quality from the next one to this one.
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auto const qualityOut
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= (nodeIndex_ != lastNodeIndex)
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? quality_out (view(),
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node().account_,
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nextAccountID,
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node().issue_.currency)
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: parityRate;
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// For previousNodeIsAccount:
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// Previous account is already owed.
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const STAmount saPrvOwed = (previousNodeIsAccount && nodeIndex_ != 0)
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? creditBalance (view(),
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node().account_,
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previousAccountID,
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node().issue_.currency)
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: STAmount (node().issue_);
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// The limit amount that the previous account may owe.
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const STAmount saPrvLimit = (previousNodeIsAccount && nodeIndex_ != 0)
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? creditLimit (view(),
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node().account_,
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previousAccountID,
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node().issue_.currency)
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: STAmount (node().issue_);
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// Next account is owed.
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const STAmount saNxtOwed = (nextNodeIsAccount && nodeIndex_ != lastNodeIndex)
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? creditBalance (view(),
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node().account_,
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nextAccountID,
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node().issue_.currency)
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: STAmount (node().issue_);
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount>"
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<< " nodeIndex_=" << nodeIndex_ << "/" << lastNodeIndex
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<< " previousAccountID=" << previousAccountID
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<< " node.account_=" << node().account_
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<< " nextAccountID=" << nextAccountID
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<< " currency=" << node().issue_.currency
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<< " qualityIn=" << qualityIn
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<< " qualityOut=" << qualityOut
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<< " saPrvOwed=" << saPrvOwed
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<< " saPrvLimit=" << saPrvLimit;
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// Requests are computed to be the maximum flow possible.
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// Previous can redeem the owed IOUs it holds.
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const STAmount saPrvRedeemReq = (saPrvOwed > beast::zero)
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? saPrvOwed
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: STAmount (saPrvOwed.issue ());
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// Previous can issue up to limit minus whatever portion of limit already
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// used (not including redeemable amount) - another "maximum flow".
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const STAmount saPrvIssueReq = (saPrvOwed < beast::zero)
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? saPrvLimit + saPrvOwed : saPrvLimit;
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// Precompute these values in case we have an order book.
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auto deliverCurrency = previousNode().saRevDeliver.getCurrency ();
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const STAmount saPrvDeliverReq (
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{deliverCurrency, previousNode().saRevDeliver.getIssuer ()}, -1);
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// -1 means unlimited delivery.
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// Set to zero, because we're trying to hit the previous node.
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auto saCurRedeemAct = node().saRevRedeem.zeroed();
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// Track the amount we actually redeem.
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auto saCurIssueAct = node().saRevIssue.zeroed();
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// For !nextNodeIsAccount
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auto saCurDeliverAct = node().saRevDeliver.zeroed();
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount:"
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<< " saPrvRedeemReq:" << saPrvRedeemReq
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<< " saPrvIssueReq:" << saPrvIssueReq
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<< " previousNode.saRevDeliver:" << previousNode().saRevDeliver
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<< " saPrvDeliverReq:" << saPrvDeliverReq
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<< " node.saRevRedeem:" << node().saRevRedeem
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<< " node.saRevIssue:" << node().saRevIssue
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<< " saNxtOwed:" << saNxtOwed;
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// VFALCO-FIXME this generates errors
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//JLOG (j_.trace()) << pathState_.getJson ();
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// Current redeem req can't be more than IOUs on hand.
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assert (!node().saRevRedeem || -saNxtOwed >= node().saRevRedeem);
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assert (!node().saRevIssue // If not issuing, fine.
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|| saNxtOwed >= beast::zero
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// saNxtOwed >= 0: Sender not holding next IOUs, saNxtOwed < 0:
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// Sender holding next IOUs.
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|| -saNxtOwed == node().saRevRedeem);
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// If issue req, then redeem req must consume all owed.
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if (nodeIndex_ == 0)
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{
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// ^ --> ACCOUNT --> account|offer
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// Nothing to do, there is no previous to adjust.
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//
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// TODO(tom): we could have skipped all that setup and just left
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// or even just never call this whole routine on nodeIndex_ = 0!
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}
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// The next four cases correspond to the table at the bottom of this Wiki
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// page section: https://ripple.com/wiki/Transit_Fees#Implementation
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else if (previousNodeIsAccount && nextNodeIsAccount)
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{
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if (isFinalNode)
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{
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// account --> ACCOUNT --> $
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// Overall deliverable.
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const STAmount saCurWantedReq = std::min (
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pathState_.outReq() - pathState_.outAct(),
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saPrvLimit + saPrvOwed);
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auto saCurWantedAct = saCurWantedReq.zeroed ();
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: account --> "
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<< "ACCOUNT --> $ :"
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<< " saCurWantedReq=" << saCurWantedReq;
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// Calculate redeem
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if (saPrvRedeemReq) // Previous has IOUs to redeem.
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{
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// Redeem your own IOUs at 1:1
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saCurWantedAct = std::min (saPrvRedeemReq, saCurWantedReq);
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previousNode().saRevRedeem = saCurWantedAct;
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uRateMax = STAmount::uRateOne;
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: Redeem at 1:1"
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<< " saPrvRedeemReq=" << saPrvRedeemReq
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<< " (available) previousNode.saRevRedeem="
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<< previousNode().saRevRedeem
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<< " uRateMax="
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<< amountFromQuality (uRateMax).getText ();
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}
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else
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{
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previousNode().saRevRedeem.clear (saPrvRedeemReq);
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}
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// Calculate issuing.
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previousNode().saRevIssue.clear (saPrvIssueReq);
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if (saCurWantedReq != saCurWantedAct // Need more.
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&& saPrvIssueReq) // Will accept IOUs from previous.
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{
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// Rate: quality in : 1.0
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// If we previously redeemed and this has a poorer rate, this
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// won't be included the current increment.
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rippleLiquidity (
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rippleCalc_,
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qualityIn,
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parityRate,
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saPrvIssueReq,
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saCurWantedReq,
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previousNode().saRevIssue,
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saCurWantedAct,
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uRateMax);
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: Issuing: Rate: "
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<< "quality in : 1.0"
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<< " previousNode.saRevIssue:" << previousNode().saRevIssue
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<< " saCurWantedAct:" << saCurWantedAct;
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}
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if (!saCurWantedAct)
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{
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// Must have processed something.
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terResult = tecPATH_DRY;
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}
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}
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else
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{
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// Not final node.
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// account --> ACCOUNT --> account
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previousNode().saRevRedeem.clear (saPrvRedeemReq);
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previousNode().saRevIssue.clear (saPrvIssueReq);
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// redeem (part 1) -> redeem
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if (node().saRevRedeem
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// Next wants IOUs redeemed from current account.
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&& saPrvRedeemReq)
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// Previous has IOUs to redeem to the current account.
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{
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// TODO(tom): add English.
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// Rate : 1.0 : quality out - we must accept our own IOUs
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// as 1:1.
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rippleLiquidity (
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rippleCalc_,
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parityRate,
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qualityOut,
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saPrvRedeemReq,
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node().saRevRedeem,
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previousNode().saRevRedeem,
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saCurRedeemAct,
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uRateMax);
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: "
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<< "Rate : 1.0 : quality out"
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<< " previousNode.saRevRedeem:" << previousNode().saRevRedeem
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<< " saCurRedeemAct:" << saCurRedeemAct;
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}
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// issue (part 1) -> redeem
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if (node().saRevRedeem != saCurRedeemAct
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// The current node has more IOUs to redeem.
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&& previousNode().saRevRedeem == saPrvRedeemReq)
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// The previous node has no IOUs to redeem remaining, so issues.
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{
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// Rate: quality in : quality out
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rippleLiquidity (
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rippleCalc_,
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qualityIn,
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qualityOut,
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saPrvIssueReq,
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node().saRevRedeem,
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previousNode().saRevIssue,
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saCurRedeemAct,
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uRateMax);
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: "
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<< "Rate: quality in : quality out:"
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<< " previousNode.saRevIssue:" << previousNode().saRevIssue
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<< " saCurRedeemAct:" << saCurRedeemAct;
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}
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// redeem (part 2) -> issue.
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if (node().saRevIssue // Next wants IOUs issued.
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// TODO(tom): this condition seems redundant.
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&& saCurRedeemAct == node().saRevRedeem
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// Can only issue if completed redeeming.
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&& previousNode().saRevRedeem != saPrvRedeemReq)
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// Did not complete redeeming previous IOUs.
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{
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// Rate : 1.0 : transfer_rate
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rippleLiquidity (
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rippleCalc_,
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parityRate,
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transferRate (view(), node().account_),
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saPrvRedeemReq,
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node().saRevIssue,
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previousNode().saRevRedeem,
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saCurIssueAct,
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uRateMax);
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JLOG (j_.debug())
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<< "reverseLiquidityForAccount: "
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<< "Rate : 1.0 : transfer_rate:"
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<< " previousNode.saRevRedeem:" << previousNode().saRevRedeem
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<< " saCurIssueAct:" << saCurIssueAct;
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}
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// issue (part 2) -> issue
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if (node().saRevIssue != saCurIssueAct
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// Need wants more IOUs issued.
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&& saCurRedeemAct == node().saRevRedeem
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// Can only issue if completed redeeming.
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&& saPrvRedeemReq == previousNode().saRevRedeem
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// Previously redeemed all owed IOUs.
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&& saPrvIssueReq)
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// Previous can issue.
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{
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// Rate: quality in : 1.0
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rippleLiquidity (
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rippleCalc_,
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qualityIn,
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parityRate,
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saPrvIssueReq,
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node().saRevIssue,
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previousNode().saRevIssue,
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saCurIssueAct,
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uRateMax);
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: "
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<< "Rate: quality in : 1.0:"
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<< " previousNode.saRevIssue:" << previousNode().saRevIssue
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<< " saCurIssueAct:" << saCurIssueAct;
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}
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if (!saCurRedeemAct && !saCurIssueAct)
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{
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// Did not make progress.
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terResult = tecPATH_DRY;
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}
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: "
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<< "^|account --> ACCOUNT --> account :"
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<< " node.saRevRedeem:" << node().saRevRedeem
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<< " node.saRevIssue:" << node().saRevIssue
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<< " saPrvOwed:" << saPrvOwed
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<< " saCurRedeemAct:" << saCurRedeemAct
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<< " saCurIssueAct:" << saCurIssueAct;
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}
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}
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else if (previousNodeIsAccount && !nextNodeIsAccount)
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{
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// account --> ACCOUNT --> offer
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// Note: deliver is always issue as ACCOUNT is the issuer for the offer
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// input.
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: "
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<< "account --> ACCOUNT --> offer";
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previousNode().saRevRedeem.clear (saPrvRedeemReq);
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previousNode().saRevIssue.clear (saPrvIssueReq);
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// We have three cases: the nxt offer can be owned by current account,
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// previous account or some third party account.
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//
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// Also, the current account may or may not have a redeemable balance
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// with the account for the next offer, so we don't yet know if we're
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// redeeming or issuing.
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//
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// TODO(tom): Make sure deliver was cleared, or check actual is zero.
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// redeem -> deliver/issue.
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if (saPrvOwed > beast::zero // Previous has IOUs to redeem.
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&& node().saRevDeliver) // Need some issued.
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{
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// Rate : 1.0 : transfer_rate
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rippleLiquidity (
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rippleCalc_,
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parityRate,
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transferRate (view(), node().account_),
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saPrvRedeemReq,
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node().saRevDeliver,
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previousNode().saRevRedeem,
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saCurDeliverAct,
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uRateMax);
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}
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// issue -> deliver/issue
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if (saPrvRedeemReq == previousNode().saRevRedeem
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// Previously redeemed all owed.
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&& node().saRevDeliver != saCurDeliverAct) // Still need some issued.
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{
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// Rate: quality in : 1.0
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rippleLiquidity (
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rippleCalc_,
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qualityIn,
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parityRate,
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saPrvIssueReq,
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node().saRevDeliver,
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previousNode().saRevIssue,
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saCurDeliverAct,
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uRateMax);
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}
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if (!saCurDeliverAct)
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{
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// Must want something.
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terResult = tecPATH_DRY;
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}
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: "
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<< " node.saRevDeliver:" << node().saRevDeliver
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<< " saCurDeliverAct:" << saCurDeliverAct
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<< " saPrvOwed:" << saPrvOwed;
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}
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else if (!previousNodeIsAccount && nextNodeIsAccount)
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{
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if (isFinalNode)
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{
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// offer --> ACCOUNT --> $
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// Previous is an offer, no limit: redeem own IOUs.
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//
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// This is the final node; we can't look to the right to get values;
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// we have to go up to get the out value for the entire path state.
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STAmount const& saCurWantedReq =
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pathState_.outReq() - pathState_.outAct();
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STAmount saCurWantedAct = saCurWantedReq.zeroed();
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount: "
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<< "offer --> ACCOUNT --> $ :"
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<< " saCurWantedReq:" << saCurWantedReq
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<< " saOutAct:" << pathState_.outAct()
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<< " saOutReq:" << pathState_.outReq();
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if (saCurWantedReq <= beast::zero)
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{
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assert(false);
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JLOG (j_.fatal()) << "CurWantReq was not positive";
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return tefEXCEPTION;
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}
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// The previous node is an offer; we are receiving our own currency.
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// The previous order book's entries might hold our issuances; might
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// not hold our issuances; might be our own offer.
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//
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// Assume the worst case, the case which costs the most to go
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// through, which is that it is not our own offer or our own
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// issuances. Later on the forward pass we may be able to do
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// better.
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//
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// TODO: this comment applies generally to this section - move it up
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// to a document.
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// Rate: quality in : 1.0
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rippleLiquidity (
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rippleCalc_,
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qualityIn,
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parityRate,
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saPrvDeliverReq,
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saCurWantedReq,
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previousNode().saRevDeliver,
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saCurWantedAct,
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uRateMax);
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if (!saCurWantedAct)
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{
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// Must have processed something.
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terResult = tecPATH_DRY;
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}
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JLOG (j_.trace())
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<< "reverseLiquidityForAccount:"
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<< " previousNode().saRevDeliver:" << previousNode().saRevDeliver
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<< " saPrvDeliverReq:" << saPrvDeliverReq
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<< " saCurWantedAct:" << saCurWantedAct
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<< " saCurWantedReq:" << saCurWantedReq;
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}
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else
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{
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// offer --> ACCOUNT --> account
|
|
// Note: offer is always delivering(redeeming) as account is issuer.
|
|
JLOG (j_.trace())
|
|
<< "reverseLiquidityForAccount: "
|
|
<< "offer --> ACCOUNT --> account :"
|
|
<< " node.saRevRedeem:" << node().saRevRedeem
|
|
<< " node.saRevIssue:" << node().saRevIssue;
|
|
|
|
// deliver -> redeem
|
|
// TODO(tom): now we have more checking in nodeRipple, these checks
|
|
// might be redundant.
|
|
if (node().saRevRedeem) // Next wants us to redeem.
|
|
{
|
|
// cur holds IOUs from the account to the right, the nxt
|
|
// account. If someone is making the current account get rid of
|
|
// the nxt account's IOUs, then charge the input for quality
|
|
// out.
|
|
//
|
|
// Rate : 1.0 : quality out
|
|
rippleLiquidity (
|
|
rippleCalc_,
|
|
parityRate,
|
|
qualityOut,
|
|
saPrvDeliverReq,
|
|
node().saRevRedeem,
|
|
previousNode().saRevDeliver,
|
|
saCurRedeemAct,
|
|
uRateMax);
|
|
}
|
|
|
|
// deliver -> issue.
|
|
if (node().saRevRedeem == saCurRedeemAct
|
|
// Can only issue if previously redeemed all.
|
|
&& node().saRevIssue)
|
|
// Need some issued.
|
|
{
|
|
// Rate : 1.0 : transfer_rate
|
|
rippleLiquidity (
|
|
rippleCalc_,
|
|
parityRate,
|
|
transferRate (view(), node().account_),
|
|
saPrvDeliverReq,
|
|
node().saRevIssue,
|
|
previousNode().saRevDeliver,
|
|
saCurIssueAct,
|
|
uRateMax);
|
|
}
|
|
|
|
JLOG (j_.trace())
|
|
<< "reverseLiquidityForAccount:"
|
|
<< " saCurRedeemAct:" << saCurRedeemAct
|
|
<< " node.saRevRedeem:" << node().saRevRedeem
|
|
<< " previousNode.saRevDeliver:" << previousNode().saRevDeliver
|
|
<< " node.saRevIssue:" << node().saRevIssue;
|
|
|
|
if (!previousNode().saRevDeliver)
|
|
{
|
|
// Must want something.
|
|
terResult = tecPATH_DRY;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// offer --> ACCOUNT --> offer
|
|
// deliver/redeem -> deliver/issue.
|
|
JLOG (j_.trace())
|
|
<< "reverseLiquidityForAccount: offer --> ACCOUNT --> offer";
|
|
|
|
// Rate : 1.0 : transfer_rate
|
|
rippleLiquidity (
|
|
rippleCalc_,
|
|
parityRate,
|
|
transferRate (view(), node().account_),
|
|
saPrvDeliverReq,
|
|
node().saRevDeliver,
|
|
previousNode().saRevDeliver,
|
|
saCurDeliverAct,
|
|
uRateMax);
|
|
|
|
if (!saCurDeliverAct)
|
|
{
|
|
// Must want something.
|
|
terResult = tecPATH_DRY;
|
|
}
|
|
}
|
|
|
|
return terResult;
|
|
}
|
|
|
|
} // path
|
|
} // ripple
|