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DowntimeCostCalculator.sol
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DowntimeCostCalculator.sol
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/*
Copyright 2017 Loopring Project Ltd (Loopring Foundation).
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
pragma solidity 0.5.10;
import "../lib/Claimable.sol";
import "../lib/MathUint.sol";
import "../lib/ReentrancyGuard.sol";
import "../iface/IDowntimeCostCalculator.sol";
/// @title The default IDowntimeCostCalculator implementation.
/// @author Daniel Wang - <daniel@loopring.org>
contract DowntimeCostCalculator is Claimable, ReentrancyGuard, IDowntimeCostCalculator
{
using MathUint for uint;
uint public basePricePerMinute;
uint public maxPenalty;
uint public gracePeriodsMinutes;
uint public gracePeriodPricePerMinute;
uint public maxAwailableDowntimeMinutes;
event SettingsUpdated(
uint oldBasePricePerMinute,
uint oldMaxPenalty,
uint oldGracePeriodMinutes,
uint oldGracePeriodPricePerMinute,
uint oldMaxAwailableDowntimeMinutes
);
constructor(
uint _basePricePerMinute,
uint _maxPenalty,
uint _gracePeriodsMinutes,
uint _gracePeriodPricePerMinute,
uint _maxAwailableDowntimeMinutes
)
Claimable()
public
{
updateSettings(
_basePricePerMinute,
_maxPenalty,
_gracePeriodsMinutes,
_gracePeriodPricePerMinute,
_maxAwailableDowntimeMinutes
);
}
function getDowntimeCostLRC(
uint totalTimeInMaintenanceSeconds,
uint totalDEXLifeTimeSeconds,
uint numDowntimeMinutes,
uint /* exchangeStakedLRC */,
uint durationToPurchaseMinutes
)
external
nonReentrant
returns (uint)
{
uint newCost = getTotalCost(
totalTimeInMaintenanceSeconds,
totalDEXLifeTimeSeconds,
numDowntimeMinutes.add(durationToPurchaseMinutes)
);
uint oldCost = getTotalCost(
totalTimeInMaintenanceSeconds,
totalDEXLifeTimeSeconds,
numDowntimeMinutes
);
return newCost > oldCost ? newCost - oldCost : 0;
}
function updateSettings(
uint _basePricePerMinute,
uint _maxPenalty,
uint _gracePeriodsMinutes,
uint _gracePeriodPricePerMinute,
uint _maxAwailableDowntimeMinutes
)
public
onlyOwner
{
require(
_basePricePerMinute > 0 && _maxPenalty > 0 &&
_gracePeriodPricePerMinute > 0 && _maxAwailableDowntimeMinutes > 0,
"ZERO_VALUE"
);
require(_gracePeriodPricePerMinute <= _basePricePerMinute, "INVALID_PRICE");
emit SettingsUpdated(
basePricePerMinute,
maxPenalty,
gracePeriodsMinutes,
gracePeriodPricePerMinute,
maxAwailableDowntimeMinutes
);
basePricePerMinute = _basePricePerMinute;
maxPenalty = _maxPenalty;
gracePeriodsMinutes = _gracePeriodsMinutes;
gracePeriodPricePerMinute = _gracePeriodPricePerMinute;
maxAwailableDowntimeMinutes = _maxAwailableDowntimeMinutes;
}
function getTotalCost(
uint totalTimeInMaintenanceSeconds,
uint totalDEXLifeTimeSeconds,
uint downtimeMinutes
)
private
view
returns (uint)
{
require(downtimeMinutes <= maxAwailableDowntimeMinutes, "PURCHASE_PROHIBITED");
uint totalMinutes = downtimeMinutes.add(totalTimeInMaintenanceSeconds / 60);
if (totalMinutes <= gracePeriodsMinutes) {
return totalMinutes.mul(gracePeriodPricePerMinute);
}
uint timeBeyondGracePeriodMinutes = totalMinutes - gracePeriodsMinutes;
uint penalty = timeBeyondGracePeriodMinutes.mul(600000) / totalDEXLifeTimeSeconds + 100;
uint _maxPenalty = maxPenalty.mul(100);
if (penalty > _maxPenalty) {
penalty = _maxPenalty;
}
return gracePeriodsMinutes.mul(gracePeriodPricePerMinute).add(
timeBeyondGracePeriodMinutes.mul(basePricePerMinute).mul(penalty) / 100
);
}
}