Contract Name:
DeFiat_Farming_v15
Contract Source Code:
File 1 of 1 : DeFiat_Farming_v15
/*
* Copyright (c) 2020 DeFiat.net
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/
// File: @openzeppelin/contracts/math/Math.sol
//
// File: @openzeppelin/contracts/math/SafeMath.sol
pragma solidity ^0.6.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath{
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*
* _Available since v2.4.0._
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow, so we distribute
return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
}
}
// File: @openzeppelin/contracts/GSN/Context.sol
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor () internal { }
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns (address payable) {
return msg.sender;
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: @openzeppelin/contracts/ownership/Ownable.sol
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
_owner = _msgSender();
emit OwnershipTransferred(address(0), _owner);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(isOwner(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Returns true if the caller is the current owner.
*/
function isOwner() public view returns (bool) {
return _msgSender() == _owner;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
*/
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
} //adding ALLOWED method
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File: @openzeppelin/contracts/utils/Address.sol
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* This test is non-exhaustive, and there may be false-negatives: during the
* execution of a contract's constructor, its address will be reported as
* not containing a contract.
*
* IMPORTANT: It is unsafe to assume that an address for which this
* function returns false is an externally-owned account (EOA) and not a
* contract.
*/
function isContract(address account) internal view returns (bool) {
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != 0x0 && codehash != accountHash);
}
/**
* @dev Converts an `address` into `address payable`. Note that this is
* simply a type cast: the actual underlying value is not changed.
*
* _Available since v2.4.0._
*/
function toPayable(address account) internal pure returns (address payable) {
return address(uint160(account));
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*
* _Available since v2.4.0._
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-call-value
(bool success, ) = recipient.call.value(amount)("");
require(success, "Address: unable to send value, recipient may have reverted");
}
}
//========
contract DeFiat_Farming_v15 {
using SafeMath for uint256;
//Structs
struct PoolMetrics {
address stakedToken;
uint256 staked; // sum of tokens staked in the contract
uint256 stakingFee; // entry fee
uint256 stakingPoints;
address rewardToken;
uint256 rewards; // current rewards in the pool
uint256 startTime; // when the pool opens
uint256 closingTime; // when the pool closes.
uint256 duration; // duration of the staking
uint256 lastEvent; // last time metrics were updated.
uint256 ratePerToken; // CALCULATED pool reward Rate per Token (calculated based on total stake and time)
}
PoolMetrics public poolMetrics;
struct UserMetrics {
uint256 stake; // native token stake (balanceOf)
uint256 stakingPoints; // staking points at lastEvent
uint256 poolPoints; // pool point at lastEvent
uint256 lastEvent;
uint256 rewardAccrued; // accrued rewards over time based on staking points
uint256 rewardsPaid; // for information only
uint256 lastTxBlock; // latest transaction from the user (antiSpam)
}
mapping(address => UserMetrics) public userMetrics;
//== constructor
constructor(address _stakedToken, address _rewardToken, uint256 _feeBase1000, uint256 _durationHours, uint256 _delayStartHours) public {
poolOperator = msg.sender;
poolMetrics.stakedToken = address(_stakedToken);
poolMetrics.rewardToken = address(_rewardToken);
poolMetrics.stakingFee = _feeBase1000; //10 = 1%
poolMetrics.duration = _durationHours.mul(3600); //
poolMetrics.startTime = block.timestamp + _delayStartHours.mul(3600);
poolMetrics.closingTime = poolMetrics.startTime + poolMetrics.duration; //corrected following report
poolMetrics.stakingPoints = 1; //avoids div by 0 at start
FullRewards = true;
}
//==Events
event PoolInitalized(uint256 amountAdded, string _desc);
event RewardTaken(address indexed user, uint256 reward, string _desc);
event userStaking(address indexed user, uint256 amount, string _desc);
event userWithdrawal(address indexed user, uint256 amount, string _desc);
modifier poolLive() {
require(block.timestamp >= poolMetrics.startTime,"Pool not started Yet"); //good for delayed starts.
require(block.timestamp <= poolMetrics.closingTime,"Pool closed"); //good for delayed starts.
_;
}
modifier poolStarted() {
require(block.timestamp >= poolMetrics.startTime,"Pool not started Yet"); //good for delayed starts.
_;
}
modifier poolEnded() {
require(block.timestamp > poolMetrics.closingTime,"Pool not ended Yet"); //good for delayed starts.
_;
}
modifier antiSpam(uint256 _blocks) {
require(block.number > userMetrics[msg.sender].lastTxBlock.add(_blocks), "Wait X BLOCKS between Transactions");
userMetrics[msg.sender].lastTxBlock = block.number; //update
_;
}
//==Basics
function currentTime() public view returns (uint256) {
return SafeMath.min(block.timestamp, poolMetrics.closingTime); //allows expiration
} // SafeMath.min(now, endTime)
//==Points locking
function viewPoolPoints() public view returns(uint256) {
uint256 _previousPoints = poolMetrics.stakingPoints; // previous points shapshot
uint256 _previousStake = poolMetrics.staked; // previous stake snapshot
uint256 _timeHeld = currentTime().sub(
SafeMath.max(poolMetrics.lastEvent, poolMetrics.startTime)
); // time held with _previous Event
return _previousPoints.add(_previousStake.mul(_timeHeld)); //generated points since event
}
function lockPoolPoints() internal returns (uint256) { //ON STAKE/UNSTAKE EVENT
poolMetrics.stakingPoints = viewPoolPoints();
poolMetrics.lastEvent = currentTime(); // update lastStakingEvent
return poolMetrics.stakingPoints;
}
function viewPointsOf(address _address) public view returns(uint256) {
uint256 _previousPoints = userMetrics[_address].stakingPoints; // snapshot
uint256 _previousStake = userMetrics[_address].stake; // stake before event
uint256 _timeHeld = currentTime().sub(
SafeMath.max(userMetrics[_address].lastEvent, poolMetrics.startTime)
); // time held since lastEvent (take RWD, STK, unSTK)
uint256 _result = _previousPoints.add(_previousStake.mul(_timeHeld));
if(_result > poolMetrics.stakingPoints){_result = poolMetrics.stakingPoints;}
return _result;
}
function lockPointsOf(address _address) internal returns (uint256) {
userMetrics[_address].poolPoints = viewPoolPoints(); // snapshot of pool points at lockEvent
userMetrics[_address].stakingPoints = viewPointsOf(_address);
userMetrics[_address].lastEvent = currentTime();
return userMetrics[_address].stakingPoints;
}
function pointsSnapshot(address _address) public returns (bool) {
lockPointsOf(_address);lockPoolPoints();
return true;
}
//==Rewards
function viewTrancheReward(uint256 _period) internal view returns(uint256) {
//uint256 _poolRewards = poolMetrics.rewards; //tokens in the pool. Note: This can be setup to a fixed amount (totalRewards)
uint256 _poolRewards = totalRewards;
if(FullRewards == false){ _poolRewards = SafeMath.min(poolMetrics.staked, _poolRewards);}
// baseline is the min( staked, rewards); avoids ultra_farming > staking pool - EXPERIMENTAL
uint256 _timeRate = _period.mul(1e18).div(poolMetrics.duration);
return _poolRewards.mul(_timeRate).div(1e18); //tranche of rewards on period
}
function userRateOnPeriod(address _address) public view returns (uint256){
//calculates the delta of pool points and user points since last Event
uint256 _deltaUser = viewPointsOf(_address).sub(userMetrics[_address].stakingPoints); // points generated since lastEvent
uint256 _deltaPool = viewPoolPoints().sub(userMetrics[_address].poolPoints); // pool points generated since lastEvent
uint256 _rate = 0;
if(_deltaUser == 0 || _deltaPool == 0 ){_rate = 0;} //rounding
else {_rate = _deltaUser.mul(1e18).div(_deltaPool);}
return _rate;
}
function viewAdditionalRewardOf(address _address) public view returns(uint256) { // rewards generated since last Event
require(poolMetrics.rewards > 0, "No Rewards in the Pool");
// user weighted average share of Pool since lastEvent
uint256 _userRateOnPeriod = userRateOnPeriod(_address); //can drop if pool size increases within period -> slows rewards generation
// Pool Yield Rate
uint256 _period = currentTime().sub(
SafeMath.max(userMetrics[_address].lastEvent, poolMetrics.startTime)
); // time elapsed since last reward or pool started (if never taken rewards)
// Calculate reward
uint256 _reward = viewTrancheReward(_period).mul(_userRateOnPeriod).div(1e18); //user rate on pool rewards' tranche
return _reward;
}
function lockRewardOf(address _address) public returns(uint256) {
uint256 _additional = viewAdditionalRewardOf(_address); //stakeShare(sinceLastEvent) * poolRewards(sinceLastEvent)
userMetrics[_address].rewardAccrued = userMetrics[_address].rewardAccrued.add(_additional); //snapshot rewards.
pointsSnapshot(_address); //updates lastEvent and points
return userMetrics[_address].rewardAccrued;
}
function takeRewards() public poolStarted antiSpam(1) { //1 blocks between rewards
require(poolMetrics.rewards > 0, "No Rewards in the Pool");
uint256 _reward = lockRewardOf(msg.sender); //returns already accrued + additional (also resets time counters)
userMetrics[msg.sender].rewardsPaid = _reward; // update user paid rewards
userMetrics[msg.sender].rewardAccrued = 0; //flush previously accrued rewards.
poolMetrics.rewards = poolMetrics.rewards.sub(_reward); // update pool rewards
IERC20(poolMetrics.rewardToken).transfer(msg.sender, _reward); // transfer
pointsSnapshot(msg.sender); //updates lastEvent
//lockRewardOf(msg.sender);
emit RewardTaken(msg.sender, _reward, "Rewards Sent");
}
//==staking & unstaking
modifier antiWhale(address _address) {
require(myStakeShare(_address) < 20000, "User stake% share too high. Leave some for the smaller guys ;-)"); //max 20%
_;
}
// avoids stakes being deposited once a user reached 20%.
// Simplistic implementation as if we calculate "futureStake" value very 1st stakers will not be able to deposit.
function stake(uint256 _amount) public poolLive antiSpam(1) antiWhale(msg.sender){
require(_amount > 0, "Cannot stake 0");
//initialize
userMetrics[msg.sender].rewardAccrued = lockRewardOf(msg.sender); //Locks previous eligible rewards based on lastRewardEvent and lastStakingEvent
pointsSnapshot(msg.sender);
//receive staked
uint256 _balanceNow = IERC20(address(poolMetrics.stakedToken)).balanceOf(address(this));
IERC20(poolMetrics.stakedToken).transferFrom(msg.sender, address(this), _amount); //will require allowance
uint256 amount = IERC20(address(poolMetrics.stakedToken)).balanceOf(address(this)).sub(_balanceNow); //actually received
//update pool and user based on stake and fee
uint256 _fee = amount.mul(poolMetrics.stakingFee).div(1000);
amount = amount.sub(_fee);
if(poolMetrics.stakedToken == poolMetrics.rewardToken){poolMetrics.rewards = poolMetrics.rewards.add(_fee);}
poolMetrics.staked = poolMetrics.staked.add(amount);
userMetrics[msg.sender].stake = userMetrics[msg.sender].stake.add(amount);
//finalize
pointsSnapshot(msg.sender); //updates lastEvent
emit userStaking(msg.sender, amount, "Staking... ... ");
}
function unStake(uint256 _amount) public poolStarted antiSpam(1) {
require(_amount > 0, "Cannot withdraw 0");
require(_amount <= userMetrics[msg.sender].stake, "Cannot withdraw more than stake");
//initialize
userMetrics[msg.sender].rewardAccrued = lockRewardOf(msg.sender); //snapshot of previous eligible rewards based on lastStakingEvent
pointsSnapshot(msg.sender);
// update metrics
userMetrics[msg.sender].stake = userMetrics[msg.sender].stake.sub(_amount);
poolMetrics.staked = poolMetrics.staked.sub(_amount);
// transfer _amount. Put at the end of the function to avoid reentrancy.
IERC20(poolMetrics.stakedToken).transfer(msg.sender, _amount);
//finalize
emit userWithdrawal(msg.sender, _amount, "Widhtdrawal");
}
function myStake(address _address) public view returns(uint256) {
return userMetrics[_address].stake;
}
function myStakeShare(address _address) public view returns(uint256) {
if(poolMetrics.staked == 0){return 0;}
else {
return (userMetrics[_address].stake).mul(100000).div(poolMetrics.staked);}
} //base 100,000
function myPointsShare(address _address) public view returns(uint256) { //weighted average of your stake over time vs the pool
return viewPointsOf(_address).mul(100000).div(viewPoolPoints());
} //base 100,000. Drops when taking rewards.=> Refills after (favors strong hands)
function myRewards(address _address) public view returns(uint256) {
//delayed start obfuscation (avoids disturbances in the force...)
if(block.timestamp <= poolMetrics.startTime || poolMetrics.rewards == 0){return 0;}
else { return userMetrics[_address].rewardAccrued.add(viewAdditionalRewardOf(_address));} //previousLock + time based extra
}
//== OPERATOR FUNCTIONS ==
address public poolOperator;
function setPoolOperator(address _address) public onlyPoolOperator {
poolOperator = _address;
}
modifier onlyPoolOperator() {
require(msg.sender == poolOperator, "msg.sender is not allowed to operate Pool");
_;
}
bool public FullRewards;
uint256 totalRewards;
function setFullRewards(bool _bool) public onlyPoolOperator {
FullRewards = _bool;
}
function loadRewards(uint256 _amount, uint256 _preStake) public onlyPoolOperator { //load tokens in the rewards pool.
uint256 _balanceNow = IERC20(address(poolMetrics.rewardToken)).balanceOf(address(this));
IERC20(address(poolMetrics.rewardToken)).transferFrom( msg.sender, address(this), _amount);
uint256 amount = IERC20(address(poolMetrics.rewardToken)).balanceOf(address(this)).sub(_balanceNow); //actually received
if(poolMetrics.rewards == 0){ // initialization
poolMetrics.staked = SafeMath.add(poolMetrics.staked,_preStake);} // creates baseline for pool. Avoids massive movements on rewards
poolMetrics.rewards = SafeMath.add(poolMetrics.rewards,amount);
totalRewards = totalRewards.add(_amount);
}
function setFee(uint256 _fee) public onlyPoolOperator {
poolMetrics.stakingFee = _fee;
}
function flushPool(address _recipient, address _ERC20address) external onlyPoolOperator poolEnded { // poolEnded { // poolEnded returns(bool) {
uint256 _amount = IERC20(_ERC20address).balanceOf(address(this));
IERC20(_ERC20address).transfer(_recipient, _amount); //use of the _ERC20 traditional transfer
//return true;
} //get tokens sent by error to contract
function killPool() public onlyPoolOperator poolEnded returns(bool) {
selfdestruct(msg.sender);
} //frees space on the ETH chain
}