Contract Address Details

0x4EE7127d43B385C77308bdF9E9d59258ab11e836

Staking Last Balance Update: Block #13048913
Created by 0xd418ā€“485ec6 at 0x158cā€“8b71fc

Balance

0 Fuse

(@ /Fuse)

Fetching tokens...

Contract name:
Staking




Optimization enabled
true
Compiler version
v0.5.7+commit.6da8b019




Optimization runs
200
EVM Version
default

Constructor Arguments

000000000000000000000000000000000000000000b5fcffc23771500a097e47e94d92b7691536ad820000000000000000000000000be9e53fd7edac9f859882afdda116645287c6290000000000000000000000000000000000000000000000000000000000278d00000000000000000000000000000000000000000000000a968163f0a57b400000000000000000000000000000000000000000000000000000000000006027e970000000000000000000000000d418c5d0c4a3d87a6c555b7aa41f13ef87485ec6

Arg [0] (address) : 0x000000000000000000b5fcffc23771500a097e47
Arg [1] (address) : 0x0000000000000000000be9e53fd7edac9f859882
Arg [2] (uint256) : 79546333488233481051041728298029085148660188388920487177145639596768278609920
Arg [3] (uint256) : 63555655070790142733837367909977622463036348875198349443072010
Arg [4] (uint256) : 68075540319549132450967771633368268362291451090476100405424159920868703600640
Arg [5] (address) : 0x000000000000000000d418c5d0c4a3d87a6c555b

              

Contract source code

/**
* Submitted for verification at blockscout.com on 2021-02-11 11:46:02.325540Z
*/
// File: contracts/external/openzeppelin-solidity/math/SafeMath.sol
pragma solidity ^0.5.0;
/**
* @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) {
require(b <= a, "SafeMath: subtraction overflow");
uint256 c = a - b;
return c;
}
/**
* @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) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, "SafeMath: division by zero");
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) {
require(b != 0, "SafeMath: modulo by zero");
return a % b;
}
}
library SafeMath64 {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint64 a, uint64 b) internal pure returns (uint64) {
uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
require(b <= a, "SafeMath: subtraction overflow");
uint64 c = a - b;
return c;
}
/**
* @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(uint64 a, uint64 b, string memory errorMessage) internal pure returns (uint64) {
require(b <= a, errorMessage);
uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
// 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;
}
uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, "SafeMath: division by zero");
uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
require(b != 0, "SafeMath: modulo by zero");
return a % b;
}
}
// File: contracts/external/openzeppelin-solidity/token/ERC20/IERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see `ERC20Detailed`.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a `Transfer` event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Mints `amount` tokens to address `account`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a `Transfer` event.
*/
function mint(address account, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through `transferFrom`. This is
* zero by default.
*
* This value changes when `approve` or `transferFrom` are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* > Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an `Approval` event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a `Transfer` event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to `approve`. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File: contracts/external/openzeppelin-solidity/token/ERC20/ERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Implementation of the `IERC20` interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using `_mint`.
* For a generic mechanism see `ERC20Mintable`.
*
* *For a detailed writeup see our guide [How to implement supply
* mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an `Approval` event is emitted on calls to `transferFrom`.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
* functions have been added to mitigate the well-known issues around setting
* allowances. See `IERC20.approve`.
*/
contract ERC20 is IERC20 {
using SafeMath for uint256;
mapping (address => uint256) internal _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to `approve`. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev See `IERC20.totalSupply`.
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev See `IERC20.balanceOf`.
*/
function balanceOf(address account) public view returns (uint256) {
return _balances[account];
}
/**
* @dev See `IERC20.transfer`.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public returns (bool) {
_transfer(msg.sender, recipient, amount);
return true;
}
/**
* @dev See `IERC20.allowance`.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See `IERC20.approve`.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 value) public returns (bool) {
_approve(msg.sender, spender, value);
return true;
}
/**
* @dev See `IERC20.transferFrom`.
*
* Emits an `Approval` event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of `ERC20`;
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `value`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to `approve` that can be used as a mitigation for
* problems described in `IERC20.approve`.
*
* Emits an `Approval` event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to `approve` that can be used as a mitigation for
* problems described in `IERC20.approve`.
*
* Emits an `Approval` event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to `transfer`, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a `Transfer` event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_balances[sender] = _balances[sender].sub(amount);
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* Emits an `Approval` event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of `ERC20`;
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `value`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
function _transferFrom(address sender, address recipient, uint256 amount) internal {
_transfer(sender, recipient, amount);
_approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a `Transfer` event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destoys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a `Transfer` event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 value) internal {
require(account != address(0), "ERC20: burn from the zero address");
_totalSupply = _totalSupply.sub(value);
_balances[account] = _balances[account].sub(value);
emit Transfer(account, address(0), value);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an `Approval` event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 value) internal {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = value;
emit Approval(owner, spender, value);
}
/**
* @dev Destoys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See `_burn` and `_approve`.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
}
}
// File: contracts/Staking.sol
/* Copyright (C) 2020 PlotX.io
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/ */
pragma solidity 0.5.7;
contract Staking {
using SafeMath for uint256;
/**
* @dev Structure to store Interest details.
* It contains total amount of tokens staked and globalYield.
*/
struct InterestData {
uint256 globalTotalStaked;
uint256 globalYieldPerToken;
uint256 lastUpdated;
mapping(address => Staker) stakers;
}
/**
* @dev Structure to store staking details.
* It contains amount of tokens staked and withdrawn interest.
*/
struct Staker {
uint256 totalStaked;
uint256 withdrawnToDate;
uint256 stakeBuyinRate;
}
// Token address
ERC20 private stakeToken;
// Reward token
ERC20 private rewardToken;
// Interest and staker data
InterestData public interestData;
uint public stakingStartTime;
uint public totalReward;
// unclaimed reward will be trasfered to this account
address public vaultAddress;
// 10^18
uint256 private constant DECIMAL1e18 = 10**18;
//Total time (in sec) over which reward will be distributed
uint256 public stakingPeriod;
/**
* @dev Emitted when `staker` stake `value` tokens.
*/
event Staked(address indexed staker, uint256 value, uint256 _globalYieldPerToken);
/**
* @dev Emitted when `staker` withdraws their stake `value` tokens.
*/
event StakeWithdrawn(address indexed staker, uint256 value, uint256 _globalYieldPerToken);
/**
* @dev Emitted when `staker` collects interest `_value`.
*/
event InterestCollected(
address indexed staker,
uint256 _value,
uint256 _globalYieldPerToken
);
/**
* @dev Constructor
* @param _stakeToken The address of stake Token
* @param _rewardToken The address of reward Token
* @param _stakingPeriod valid staking time after staking starts
* @param _totalRewardToBeDistributed total amount to be distributed as reward
*/
constructor(
address _stakeToken,
address _rewardToken,
uint256 _stakingPeriod,
uint256 _totalRewardToBeDistributed,
uint256 _stakingStart,
address _vaultAdd
) public {
require(_stakingPeriod > 0, "Should be positive");
require(_totalRewardToBeDistributed > 0, "Total reward can not be 0");
require(_stakingStart >= now, "Can not be past time");
require(_stakeToken != address(0), "Can not be null address");
require(_rewardToken != address(0), "Can not be null address");
require(_vaultAdd != address(0), "Can not be null address");
stakeToken = ERC20(_stakeToken);
rewardToken = ERC20(_rewardToken);
stakingStartTime = _stakingStart;
interestData.lastUpdated = _stakingStart;
stakingPeriod = _stakingPeriod;
totalReward = _totalRewardToBeDistributed;
vaultAddress = _vaultAdd;
}
/**
* @dev Allows a staker to deposit Tokens. Notice that `approve` is
* needed to be executed before the execution of this method.
* @param _amount The amount of tokens to stake
*/
function stake(uint256 _amount) external {
require(_amount > 0, "You need to stake a positive token amount");
require(
stakeToken.transferFrom(msg.sender, address(this), _amount),
"TransferFrom failed, make sure you approved token transfer"
);
require(now.sub(stakingStartTime) <= stakingPeriod, "Can not stake after staking period passed");
uint newlyInterestGenerated = now.sub(interestData.lastUpdated).mul(totalReward).div(stakingPeriod);
interestData.lastUpdated = now;
updateGlobalYieldPerToken(newlyInterestGenerated);
updateStakeData(msg.sender, _amount);
emit Staked(msg.sender, _amount, interestData.globalYieldPerToken);
}
/**
* @dev Updates InterestData and Staker data while staking.
* must call update globalYieldPerToken before this operation
* @param _staker Staker's address
* @param _stake Amount of stake
*
*/
function updateStakeData(
address _staker,
uint256 _stake
) internal {
Staker storage _stakerData = interestData.stakers[_staker];
_stakerData.totalStaked = _stakerData.totalStaked.add(_stake);
updateStakeBuyinRate(
_stakerData,
interestData.globalYieldPerToken,
_stake
);
interestData.globalTotalStaked = interestData.globalTotalStaked.add(_stake);
}
/**
* @dev Calculates and updates the yield rate in which the staker has entered
* a staker may stake multiple times, so we calculate his cumulative rate his earning will be calculated based on GlobalYield and StakeBuyinRate
* Formula:
* StakeBuyinRate = [StakeBuyinRate(P) + (GlobalYield(P) x Stake)]
*
* @param _stakerData Staker's Data
* @param _globalYieldPerToken Total yielding amount per token
* @param _stake Amount staked
*
*/
function updateStakeBuyinRate(
Staker storage _stakerData,
uint256 _globalYieldPerToken,
uint256 _stake
) internal {
_stakerData.stakeBuyinRate = _stakerData.stakeBuyinRate.add(
_globalYieldPerToken.mul(_stake).div(DECIMAL1e18)
);
}
/**
* @dev Withdraws the sender staked Token.
*/
function withdrawStakeAndInterest(uint256 _amount) external {
Staker storage staker = interestData.stakers[msg.sender];
require(_amount > 0, "Should withdraw positive amount");
require(staker.totalStaked >= _amount, "Not enough token staked");
withdrawInterest();
updateStakeAndInterestData(msg.sender, _amount);
require(stakeToken.transfer(msg.sender, _amount), "withdraw transfer failed");
emit StakeWithdrawn(msg.sender, _amount, interestData.globalYieldPerToken);
}
/**
* @dev Updates InterestData and Staker data while withdrawing stake.
*
* @param _staker Staker address
* @param _amount Amount of stake to withdraw
*
*/
function updateStakeAndInterestData(
address _staker,
uint256 _amount
) internal {
Staker storage _stakerData = interestData.stakers[_staker];
_stakerData.totalStaked = _stakerData.totalStaked.sub(_amount);
interestData.globalTotalStaked = interestData.globalTotalStaked.sub(_amount);
_stakerData.stakeBuyinRate = 0;
_stakerData.withdrawnToDate = 0;
updateStakeBuyinRate(
_stakerData,
interestData.globalYieldPerToken,
_stakerData.totalStaked
);
}
/**
* @dev Withdraws the sender Earned interest.
*/
function withdrawInterest() public {
uint timeSinceLastUpdate = _timeSinceLastUpdate();
uint newlyInterestGenerated = timeSinceLastUpdate.mul(totalReward).div(stakingPeriod);
updateGlobalYieldPerToken(newlyInterestGenerated);
uint256 interest = calculateInterest(msg.sender);
Staker storage stakerData = interestData.stakers[msg.sender];
stakerData.withdrawnToDate = stakerData.withdrawnToDate.add(interest);
require(rewardToken.transfer(msg.sender, interest), "Withdraw interest transfer failed");
emit InterestCollected(msg.sender, interest, interestData.globalYieldPerToken);
}
function updateGlobalYield() public {
uint timeSinceLastUpdate = _timeSinceLastUpdate();
uint newlyInterestGenerated = timeSinceLastUpdate.mul(totalReward).div(stakingPeriod);
updateGlobalYieldPerToken(newlyInterestGenerated);
}
function getYieldData(address _staker) public view returns(uint256, uint256)
{
return (interestData.globalYieldPerToken, interestData.stakers[_staker].stakeBuyinRate);
}
function _timeSinceLastUpdate() internal returns(uint256) {
uint timeSinceLastUpdate;
if(now.sub(stakingStartTime) > stakingPeriod)
{
timeSinceLastUpdate = stakingStartTime.add(stakingPeriod).sub(interestData.lastUpdated);
interestData.lastUpdated = stakingStartTime.add(stakingPeriod);
} else {
timeSinceLastUpdate = now.sub(interestData.lastUpdated);
interestData.lastUpdated = now;
}
return timeSinceLastUpdate;
}
/**
* @dev Calculates Interest for staker for their stake.
*
* Formula:
* EarnedInterest = MAX[TotalStaked x GlobalYield - (StakeBuyinRate + WithdrawnToDate), 0]
*
* @param _staker Staker's address
*
* @return The amount of tokens credit for the staker.
*/
function calculateInterest(address _staker)
public
view
returns (uint256)
{
Staker storage stakerData = interestData.stakers[_staker];
uint256 _withdrawnToDate = stakerData.withdrawnToDate;
uint256 intermediateInterest = stakerData
.totalStaked
.mul(interestData.globalYieldPerToken).div(DECIMAL1e18);
uint256 intermediateVal = _withdrawnToDate.add(
stakerData.stakeBuyinRate
);
// will lead to -ve value
if (intermediateVal > intermediateInterest) {
return 0;
}
uint _earnedInterest = (intermediateInterest.sub(intermediateVal));
return _earnedInterest;
}
/**
* @dev Calculates and updates new accrued amount per token since last update.
*
* Formula:
* GlobalYield = GlobalYield(P) + newlyGeneratedInterest/GlobalTotalStake.
*
* @param _interestGenerated Interest token earned since last update.
*
*/
function updateGlobalYieldPerToken(
uint256 _interestGenerated
) internal {
if (interestData.globalTotalStaked == 0) {
require(rewardToken.transfer(vaultAddress, _interestGenerated), "Transfer failed while trasfering to vault");
return;
}
interestData.globalYieldPerToken = interestData.globalYieldPerToken.add(
_interestGenerated
.mul(DECIMAL1e18)
.div(interestData.globalTotalStaked)
);
}
function getStakerData(address _staker) public view returns(uint256, uint256)
{
return (interestData.stakers[_staker].totalStaked, interestData.stakers[_staker].withdrawnToDate);
}
/**
* @dev returns stats data.
* @param _staker Address of staker.
* @return Total staked.
* @return Total reward to be distributed.
* @return estimated reward for user at end of staking period if no one stakes from current time.
* @return Unlocked reward based on elapsed time.
* @return Accrued reward for user till now.
*/
function getStatsData(address _staker) external view returns(uint, uint, uint, uint, uint)
{
Staker storage stakerData = interestData.stakers[_staker];
uint estimatedReward = 0;
uint unlockedReward = 0;
uint accruedReward = 0;
uint timeElapsed = now.sub(stakingStartTime);
if(timeElapsed > stakingPeriod)
{
timeElapsed = stakingPeriod;
}
unlockedReward = timeElapsed.mul(totalReward).div(stakingPeriod);
uint timeSinceLastUpdate;
if(timeElapsed == stakingPeriod)
{
timeSinceLastUpdate = stakingStartTime.add(stakingPeriod).sub(interestData.lastUpdated);
} else {
timeSinceLastUpdate = now.sub(interestData.lastUpdated);
}
uint newlyInterestGenerated = timeSinceLastUpdate.mul(totalReward).div(stakingPeriod);
uint updatedGlobalYield;
uint stakingTimeLeft = 0;
if(now < stakingStartTime.add(stakingPeriod)){
stakingTimeLeft = stakingStartTime.add(stakingPeriod).sub(now);
}
uint interestGeneratedEnd = stakingTimeLeft.mul(totalReward).div(stakingPeriod);
uint globalYieldEnd;
if (interestData.globalTotalStaked != 0) {
updatedGlobalYield = interestData.globalYieldPerToken.add(
newlyInterestGenerated
.mul(DECIMAL1e18)
.div(interestData.globalTotalStaked));
globalYieldEnd = updatedGlobalYield.add(interestGeneratedEnd.mul(DECIMAL1e18).div(interestData.globalTotalStaked));
}
accruedReward = stakerData
.totalStaked
.mul(updatedGlobalYield).div(DECIMAL1e18);
if (stakerData.withdrawnToDate.add(stakerData.stakeBuyinRate) > accruedReward)
{
accruedReward = 0;
} else {
accruedReward = accruedReward.sub(stakerData.withdrawnToDate.add(stakerData.stakeBuyinRate));
}
estimatedReward = stakerData
.totalStaked
.mul(globalYieldEnd).div(DECIMAL1e18);
if (stakerData.withdrawnToDate.add(stakerData.stakeBuyinRate) > estimatedReward) {
estimatedReward = 0;
} else {
estimatedReward = estimatedReward.sub(stakerData.withdrawnToDate.add(stakerData.stakeBuyinRate));
}
return (interestData.globalTotalStaked, totalReward, estimatedReward, unlockedReward, accruedReward);
}
}

Contract ABI

[{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"withdrawInterest","inputs":[],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"withdrawStakeAndInterest","inputs":[{"type":"uint256","name":"_amount"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"updateGlobalYield","inputs":[],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"globalTotalStaked"},{"type":"uint256","name":"globalYieldPerToken"},{"type":"uint256","name":"lastUpdated"}],"name":"interestData","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"vaultAddress","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"stakingStartTime","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"totalReward","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""},{"type":"uint256","name":""}],"name":"getYieldData","inputs":[{"type":"address","name":"_staker"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"stake","inputs":[{"type":"uint256","name":"_amount"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"stakingPeriod","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""},{"type":"uint256","name":""}],"name":"getStakerData","inputs":[{"type":"address","name":"_staker"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"calculateInterest","inputs":[{"type":"address","name":"_staker"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""},{"type":"uint256","name":""},{"type":"uint256","name":""},{"type":"uint256","name":""},{"type":"uint256","name":""}],"name":"getStatsData","inputs":[{"type":"address","name":"_staker"}],"constant":true},{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"address","name":"_stakeToken"},{"type":"address","name":"_rewardToken"},{"type":"uint256","name":"_stakingPeriod"},{"type":"uint256","name":"_totalRewardToBeDistributed"},{"type":"uint256","name":"_stakingStart"},{"type":"address","name":"_vaultAdd"}]},{"type":"event","name":"Staked","inputs":[{"type":"address","name":"staker","indexed":true},{"type":"uint256","name":"value","indexed":false},{"type":"uint256","name":"_globalYieldPerToken","indexed":false}],"anonymous":false},{"type":"event","name":"StakeWithdrawn","inputs":[{"type":"address","name":"staker","indexed":true},{"type":"uint256","name":"value","indexed":false},{"type":"uint256","name":"_globalYieldPerToken","indexed":false}],"anonymous":false},{"type":"event","name":"InterestCollected","inputs":[{"type":"address","name":"staker","indexed":true},{"type":"uint256","name":"_value","indexed":false},{"type":"uint256","name":"_globalYieldPerToken","indexed":false}],"anonymous":false}]
            

Contract Byte Code

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