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The Ripple protocol represent transfer rates and trust line qualities as fractions of one billion. For example, a transfer rate of 1% is represented as 1010000000. Previously, such rates where represented either as std::uint32_t or std::uint64_t. Other, nominally related types, also used an integral representation and could be unintentionally substituted. The new Rate class addresses this by providing a simple, type safe alternative which also helps make the code self-documenting since arithmetic operations now can be clearly understood to involve the scaling of an amount by a rate.
113 lines
3.9 KiB
C++
113 lines
3.9 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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#ifndef RIPPLE_APP_PATHS_NODE_H_INCLUDED
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#define RIPPLE_APP_PATHS_NODE_H_INCLUDED
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#include <ripple/app/paths/NodeDirectory.h>
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#include <ripple/app/paths/Types.h>
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#include <ripple/protocol/Rate.h>
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#include <ripple/protocol/UintTypes.h>
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#include <boost/optional.hpp>
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namespace ripple {
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namespace path {
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struct Node
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{
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using List = std::vector<Node>;
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inline bool isAccount() const
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{
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return (uFlags & STPathElement::typeAccount);
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}
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Json::Value getJson () const;
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bool operator == (Node const&) const;
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std::uint16_t uFlags; // --> From path.
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AccountID account_; // --> Accounts: Receiving/sending account.
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Issue issue_; // --> Accounts: Receive and send, Offers: send.
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// --- For offer's next has currency out.
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boost::optional<Rate> transferRate_; // Transfer rate for issuer.
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// Computed by Reverse.
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STAmount saRevRedeem; // <-- Amount to redeem to next.
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STAmount saRevIssue; // <-- Amount to issue to next, limited by
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// credit and outstanding IOUs. Issue
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// isn't used by offers.
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STAmount saRevDeliver; // <-- Amount to deliver to next regardless of
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// fee.
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// Computed by forward.
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STAmount saFwdRedeem; // <-- Amount node will redeem to next.
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STAmount saFwdIssue; // <-- Amount node will issue to next.
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// Issue isn't used by offers.
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STAmount saFwdDeliver; // <-- Amount to deliver to next regardless of
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// fee.
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// For offers:
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boost::optional<Rate> rateMax;
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// The nodes are partitioned into a buckets called "directories".
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//
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// Each "directory" contains nodes with exactly the same "quality" (meaning
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// the conversion rate between one corrency and the next).
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//
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// The "directories" are ordered in "increasing" "quality" value, which
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// means that the first "directory" has the "best" (i.e. numerically least)
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// "quality".
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// https://ripple.com/wiki/Ledger_Format#Prioritizing_a_continuous_key_space
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NodeDirectory directory;
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STAmount saOfrRate; // For correct ratio.
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// PaymentNode
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bool bEntryAdvance; // Need to advance entry.
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unsigned int uEntry;
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uint256 offerIndex_;
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SLE::pointer sleOffer;
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AccountID offerOwnerAccount_;
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// Do we need to refresh saOfferFunds, saTakerPays, & saTakerGets?
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bool bFundsDirty;
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STAmount saOfferFunds;
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STAmount saTakerPays;
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STAmount saTakerGets;
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/** Clear input and output amounts. */
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void clear()
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{
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saRevRedeem.clear ();
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saRevIssue.clear ();
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saRevDeliver.clear ();
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saFwdDeliver.clear ();
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}
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};
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} // path
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} // ripple
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#endif
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