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FeeBase.sol
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FeeBase.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import {Ownable} from '../dependencies/openzeppelin/contracts/Ownable.sol';
import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol';
import {GPv2SafeERC20} from '../dependencies/gnosis/contracts/GPv2SafeERC20.sol';
import {SafeMath} from '../dependencies/openzeppelin/contracts/SafeMath.sol';
contract FeeBase {
using GPv2SafeERC20 for IERC20;
using SafeMath for uint256;
uint256 public pct100;
uint256 public rewardFeeRate;
address public rewardFeeDestination;
event RewardFeeChanged(uint256 _old, uint256 _new);
event RewardAddressChanged(address _old, address _new);
event RewardFeeCharged(uint256 initialAmount, uint256 feeAmount, address feeDestination);
function initializeFeeBase(uint256 _rewardFeeRate, address _rewardFeeDestination) internal {
pct100 = 100000000000;
rewardFeeRate = _rewardFeeRate;
rewardFeeDestination = _rewardFeeDestination;
}
function _setRewardFeeAddress(address _new) internal {
emit RewardAddressChanged(rewardFeeDestination, _new);
rewardFeeDestination = _new;
}
function _setRewardFeeRate(uint256 _new) internal {
require(_new >= 0, 'fee is not >= 0%');
require(_new <= pct100, 'fee is not <= 100%');
emit RewardFeeChanged(rewardFeeRate, _new);
rewardFeeRate = _new;
}
function _chargeFee(IERC20 token, uint256 earnings) internal {
if (earnings == 0) return;
// pay out fees to governance
uint256 feeToCharge = earnings.mul(rewardFeeRate).div(pct100);
if (feeToCharge > 0 && rewardFeeDestination != address(0)) {
token.safeTransfer(rewardFeeDestination, feeToCharge);
emit RewardFeeCharged(earnings, feeToCharge, rewardFeeDestination);
}
}
}