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-/*
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- * ZeroTier One - Network Virtualization Everywhere
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- * Copyright (C) 2011-2015 ZeroTier, Inc.
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- *
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- * This program is free software: you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation, either version 3 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program. If not, see <http://www.gnu.org/licenses/>.
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- *
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- * --
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- *
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- * ZeroTier may be used and distributed under the terms of the GPLv3, which
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- * are available at: http://www.gnu.org/licenses/gpl-3.0.html
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- *
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- * If you would like to embed ZeroTier into a commercial application or
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- * redistribute it in a modified binary form, please contact ZeroTier Networks
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- * LLC. Start here: http://www.zerotier.com/
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- */
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-
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-#ifndef ZT_BWACCOUNT_HPP
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-#define ZT_BWACCOUNT_HPP
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-
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-#include "Constants.hpp"
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-
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-#include <algorithm>
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-
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-#include <stdint.h>
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-#include <math.h>
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-
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-#include "Utils.hpp"
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-
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-#ifdef __WINDOWS__
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-#define round(x) ((x-floor(x))>0.5 ? ceil(x) : floor(x))
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-#endif
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-
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-namespace ZeroTier {
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-
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-/**
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- * Bandwidth account used for rate limiting multicast groups
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- *
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- * This is used to apply a bank account model to multicast groups. Each
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- * multicast packet counts against a balance, which accrues at a given
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- * rate in bytes per second. Debt is possible. These parameters are
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- * configurable.
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- *
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- * A bank account model permits bursting behavior, which correctly models
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- * how OSes and apps typically use multicast. It's common for things to
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- * spew lots of multicast messages at once, wait a while, then do it
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- * again. A consistent bandwidth limit model doesn't fit.
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- */
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-class BandwidthAccount
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-{
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-public:
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- /**
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- * Create an uninitialized account
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- *
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- * init() must be called before this is used.
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- */
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- BandwidthAccount() throw() {}
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-
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- /**
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- * Create and initialize
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- *
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- * @param preload Initial balance to place in account
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- * @param maxb Maximum allowed balance (> 0)
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- * @param acc Rate of accrual in bytes per second
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- * @param now Current time
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- */
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- BandwidthAccount(uint32_t preload,uint32_t maxb,uint32_t acc,uint64_t now)
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- throw()
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- {
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- init(preload,maxb,acc,now);
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- }
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-
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- /**
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- * Initialize or re-initialize account
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- *
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- * @param preload Initial balance to place in account
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- * @param maxb Maximum allowed balance (> 0)
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- * @param acc Rate of accrual in bytes per second
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- * @param now Current time
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- */
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- inline void init(uint32_t preload,uint32_t maxb,uint32_t acc,uint64_t now)
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- throw()
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- {
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- _lastTime = ((double)now / 1000.0);
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- _balance = preload;
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- _maxBalance = maxb;
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- _accrual = acc;
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- }
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-
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- /**
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- * Update and retrieve balance of this account
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- *
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- * @param now Current time
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- * @return New balance updated from current clock
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- */
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- inline uint32_t update(uint64_t now)
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- throw()
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- {
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- double lt = _lastTime;
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- double nowf = ((double)now / 1000.0);
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- _lastTime = nowf;
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- return (_balance = std::min(_maxBalance,(uint32_t)round((double)_balance + ((double)_accrual * (nowf - lt)))));
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- }
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-
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- /**
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- * Update balance and conditionally deduct
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- *
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- * If the deduction amount fits, it is deducted after update. Otherwise
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- * balance is updated and false is returned.
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- *
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- * @param amt Amount to deduct
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- * @param now Current time
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- * @return True if amount fit within balance and was deducted
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- */
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- inline bool deduct(uint32_t amt,uint64_t now)
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- throw()
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- {
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- if (update(now) >= amt) {
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- _balance -= amt;
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- return true;
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- }
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- return false;
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- }
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-
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- /**
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- * @return Most recent balance without update
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- */
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- inline uint32_t balance() const
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- throw()
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- {
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- return _balance;
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- }
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-
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-private:
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- double _lastTime;
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- uint32_t _balance;
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- uint32_t _maxBalance;
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- uint32_t _accrual;
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-};
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-
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-} // namespace ZeroTier
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-
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-#endif
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