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149 lines
4.4 KiB
C++
149 lines
4.4 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_CORE_LOADFEETRACK_H_INCLUDED
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#define RIPPLE_CORE_LOADFEETRACK_H_INCLUDED
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#include <ripple/json/json_value.h>
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#include <ripple/beast/utility/Journal.h>
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#include <algorithm>
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#include <cstdint>
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#include <mutex>
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namespace ripple {
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struct Fees;
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/** Manages the current fee schedule.
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The "base" fee is the cost to send a reference transaction under no load,
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expressed in millionths of one XRP.
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The "load" fee is how much the local server currently charges to send a
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reference transaction. This fee fluctuates based on the load of the
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server.
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*/
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class LoadFeeTrack final
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{
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public:
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explicit LoadFeeTrack (beast::Journal journal =
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beast::Journal(beast::Journal::getNullSink()))
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: j_ (journal)
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, localTxnLoadFee_ (lftNormalFee)
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, remoteTxnLoadFee_ (lftNormalFee)
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, clusterTxnLoadFee_ (lftNormalFee)
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, raiseCount_ (0)
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{
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}
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~LoadFeeTrack() = default;
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void setRemoteFee (std::uint32_t f)
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{
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std::lock_guard sl (lock_);
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remoteTxnLoadFee_ = f;
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}
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std::uint32_t getRemoteFee () const
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{
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std::lock_guard sl (lock_);
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return remoteTxnLoadFee_;
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}
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std::uint32_t getLocalFee () const
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{
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std::lock_guard sl (lock_);
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return localTxnLoadFee_;
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}
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std::uint32_t getClusterFee () const
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{
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std::lock_guard sl (lock_);
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return clusterTxnLoadFee_;
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}
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std::uint32_t getLoadBase () const
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{
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return lftNormalFee;
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}
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std::uint32_t getLoadFactor () const
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{
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std::lock_guard sl (lock_);
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return std::max({ clusterTxnLoadFee_, localTxnLoadFee_, remoteTxnLoadFee_ });
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}
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std::pair<std::uint32_t, std::uint32_t>
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getScalingFactors() const
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{
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std::lock_guard sl(lock_);
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return std::make_pair(
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std::max(localTxnLoadFee_, remoteTxnLoadFee_),
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std::max(remoteTxnLoadFee_, clusterTxnLoadFee_));
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}
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void setClusterFee (std::uint32_t fee)
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{
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std::lock_guard sl (lock_);
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clusterTxnLoadFee_ = fee;
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}
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bool raiseLocalFee ();
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bool lowerLocalFee ();
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bool isLoadedLocal () const
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{
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std::lock_guard sl (lock_);
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return (raiseCount_ != 0) || (localTxnLoadFee_ != lftNormalFee);
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}
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bool isLoadedCluster () const
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{
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std::lock_guard sl (lock_);
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return (raiseCount_ != 0) || (localTxnLoadFee_ != lftNormalFee) ||
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(clusterTxnLoadFee_ != lftNormalFee);
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}
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private:
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static std::uint32_t constexpr lftNormalFee = 256; // 256 is the minimum/normal load factor
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static std::uint32_t constexpr lftFeeIncFraction = 4; // increase fee by 1/4
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static std::uint32_t constexpr lftFeeDecFraction = 4; // decrease fee by 1/4
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static std::uint32_t constexpr lftFeeMax = lftNormalFee * 1000000;
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beast::Journal const j_;
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std::mutex mutable lock_;
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std::uint32_t localTxnLoadFee_; // Scale factor, lftNormalFee = normal fee
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std::uint32_t remoteTxnLoadFee_; // Scale factor, lftNormalFee = normal fee
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std::uint32_t clusterTxnLoadFee_; // Scale factor, lftNormalFee = normal fee
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std::uint32_t raiseCount_;
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};
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//------------------------------------------------------------------------------
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// Scale using load as well as base rate
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std::uint64_t scaleFeeLoad(std::uint64_t fee, LoadFeeTrack const& feeTrack,
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Fees const& fees, bool bUnlimited);
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} // ripple
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#endif
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