Contract Name:
StakingPoolV3Flat
Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/Context.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.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* 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.
*/
abstract 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() {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the 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 virtual onlyOwner {
_setOwner(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 virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
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 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.
*
* IMPORTANT: 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);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../../../utils/Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) {
// Return data is optional
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is 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.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @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].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @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 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.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
// StakingPoolV3
// - Fixed total, reward per second
// - Dynamic APY based on pool size
// - Multiple deposit packages with separate locking time
contract StakingPoolV3Flat is Ownable, ReentrancyGuard {
using SafeERC20 for IERC20;
struct UserInfo {
bool isAdded;
address addr;
uint256 totalAmount;
uint256 nextDepositId;
}
struct DepositInfo {
uint256 amount;
uint256 lockFrom;
uint256 lockTo;
uint256 rewardDebt;
uint256 rewardPending;
}
// The precision factor. Should be 1e12 to avoid overflow.
uint256 private constant _PRECISION_FACTOR = 1e12;
IERC20 public rewardToken;
IERC20 public stakedToken;
// Info of each user that stakes tokens (stakedToken)
mapping(address => UserInfo) public userInfos;
// User list
address[] public userList;
// depositInfos[user][depositId] = DepositInfo
mapping(address => mapping(uint256 => DepositInfo)) public depositInfos;
// Reward tokens created per second.
uint256 public rewardPerSecond;
// The time when Pool mining starts.
uint256 public startTime;
// The time when Pool mining ends.
uint256 public endTime;
// The time of the last pool update
uint256 public lastRewardTime;
// Accumulated token per share
uint256 public accTokenPerShare;
// Total staking tokens
uint256 public totalStakingTokens;
// Total reward tokens
uint256 public totalRewardTokens;
// Freeze start time
uint256 public freezeStartTime;
// Freeze end time
uint256 public freezeEndTime;
// The pool limit (0 if none)
uint256 public poolLimitPerUser;
// Minimum deposit amount
uint256 public minDepositAmount;
// The locking duration for each deposit package
uint256 public lockDuration;
// delegators[staker][delegate] = status
mapping(address => mapping(address => bool)) public delegators;
event EDeposit(address indexed user, uint256 amount, uint256 depositId);
event EWithdraw(address indexed user, uint256 amount, uint256 depositId);
event EAddRewardTokens(address indexed user, uint256 amount);
constructor(
IERC20 _stakedToken,
IERC20 _rewardToken,
uint256 _rewardPerSecond,
uint256 _startTime,
uint256 _endTime,
uint256 _lockDuration
) {
stakedToken = _stakedToken;
rewardToken = _rewardToken;
rewardPerSecond = _rewardPerSecond;
startTime = _startTime;
endTime = _endTime;
lockDuration = _lockDuration;
lastRewardTime = startTime;
}
/*
* @notice isFrozen is true => user cannot call deposit, withdraw function
*/
function isFrozen() public view returns (bool) {
return block.timestamp >= freezeStartTime && block.timestamp <= freezeEndTime;
}
/*
* @notice View function to see pending reward on frontend.
* @param _user: user address
* @param _depositId: deposit id
* @return Pending reward for a given user and depositId
*/
function pendingReward(address _user, uint256 _depositId) external view returns (uint256) {
DepositInfo storage deposit = depositInfos[_user][_depositId];
if (block.timestamp > lastRewardTime && totalStakingTokens != 0) {
uint256 multiplier = _getMultiplier(lastRewardTime, block.timestamp);
uint256 tokenReward = multiplier * rewardPerSecond;
uint256 adjustedTokenPerShare = accTokenPerShare + ((tokenReward * _PRECISION_FACTOR) / totalStakingTokens);
return
deposit.rewardPending + (((deposit.amount * adjustedTokenPerShare) / _PRECISION_FACTOR) - deposit.rewardDebt);
} else {
return deposit.rewardPending + (((deposit.amount * accTokenPerShare) / _PRECISION_FACTOR) - deposit.rewardDebt);
}
}
/*
* @notice Length of users
*/
function getUserListLength() external view returns (uint) {
return userList.length;
}
/*
* @notice View function to get users.
* @param _offset: offset for paging
* @param _limit: limit for paging
* @return get users, next offset and total users
*/
function getUsersPaging(
uint _offset,
uint _limit
) external view returns (UserInfo[] memory users, uint nextOffset, uint total) {
uint totalUsers = userList.length;
if (_limit == 0) {
_limit = 1;
}
if (_limit > totalUsers - _offset) {
_limit = totalUsers - _offset;
}
UserInfo[] memory values = new UserInfo[](_limit);
for (uint i = 0; i < _limit; i++) {
values[i] = userInfos[userList[_offset + i]];
}
return (values, _offset + _limit, totalUsers);
}
/*
* @notice Deposit staked tokens and collect reward tokens (if any)
* @param _amount: amount to withdraw (in rewardToken)
*/
function depositTokens(uint256 _amount) external nonReentrant {
require(block.timestamp >= startTime && block.timestamp <= endTime, "Invalid time");
require(!isFrozen(), "Deposit is frozen");
require(_amount > 0, "Invalid amount");
address sender_ = _msgSender();
UserInfo storage user = userInfos[sender_];
require(_amount + user.totalAmount >= minDepositAmount, "User amount below minimum");
if (poolLimitPerUser > 0) {
require(_amount + user.totalAmount <= poolLimitPerUser, "User amount above limit");
}
_updatePool();
if (!user.isAdded) {
user.isAdded = true;
user.addr = sender_;
userList.push(sender_);
}
DepositInfo storage deposit = depositInfos[sender_][user.nextDepositId++];
if (deposit.amount > 0) {
deposit.rewardPending += ((deposit.amount * accTokenPerShare) / _PRECISION_FACTOR) - deposit.rewardDebt;
}
// Check real amount to avoid taxed token
uint256 previousBalance_ = stakedToken.balanceOf(address(this));
stakedToken.safeTransferFrom(sender_, address(this), _amount);
uint256 newBalance_ = stakedToken.balanceOf(address(this));
uint256 addedAmount_ = newBalance_ - previousBalance_;
user.totalAmount += addedAmount_;
totalStakingTokens += addedAmount_;
deposit.amount += addedAmount_;
deposit.lockFrom = block.timestamp;
deposit.lockTo = block.timestamp + lockDuration;
deposit.rewardDebt = (deposit.amount * accTokenPerShare) / _PRECISION_FACTOR;
emit EDeposit(sender_, addedAmount_, user.nextDepositId - 1);
}
/*
* @notice Withdraw staked tokens and collect reward tokens
*/
function withdrawTokens(address _staker, uint256 _amount, uint256 _depositId) external nonReentrant {
require(!isFrozen(), "Withdraw is frozen");
require(_amount > 0, "Invalid amount");
address trigger_ = _msgSender();
if (trigger_ != _staker) {
require(delegators[_staker][trigger_], "Invalid user");
}
DepositInfo storage deposit = depositInfos[_staker][_depositId];
require(deposit.amount >= _amount, "Amount to withdraw too high");
require(block.timestamp >= deposit.lockTo, "Invalid time to withdraw");
_updatePool();
deposit.rewardPending += ((deposit.amount * accTokenPerShare) / _PRECISION_FACTOR) - deposit.rewardDebt;
uint256 pending = deposit.rewardPending;
if (pending > 0) {
deposit.rewardPending = 0;
_safeRewardTransfer(trigger_, pending);
}
UserInfo storage user = userInfos[_staker];
user.totalAmount -= _amount;
totalStakingTokens -= _amount;
deposit.amount -= _amount;
stakedToken.safeTransfer(trigger_, _amount);
deposit.rewardDebt = (deposit.amount * accTokenPerShare) / _PRECISION_FACTOR;
emit EWithdraw(_staker, _amount, _depositId);
}
/*
* @dev Set delegator
*/
function setDelegators(address _delegator, bool _status) external nonReentrant {
delegators[_msgSender()][_delegator] = _status;
}
/*
* @dev Update lock duration
*/
function setLockDuration(uint256 _duration) external onlyOwner {
lockDuration = _duration;
}
/**
* @notice It allows the admin to add reward tokens
* @param _amount: amount of tokens
* @dev This function is only callable by admin.
*/
function addRewardTokens(uint256 _amount) external onlyOwner {
// Check real amount to avoid taxed token
uint256 previousBalance_ = rewardToken.balanceOf(address(this));
rewardToken.safeTransferFrom(msg.sender, address(this), _amount);
uint256 newBalance_ = rewardToken.balanceOf(address(this));
uint256 addedAmount_ = newBalance_ - previousBalance_;
totalRewardTokens += addedAmount_;
emit EAddRewardTokens(msg.sender, addedAmount_);
}
/**
* @notice It allows the admin to correct reward tokens
*/
function correctRewardTokens(uint256 _amount) external onlyOwner {
totalRewardTokens = _amount;
}
/**
* @notice It allows the admin to recover wrong tokens sent to the contract
* @param _tokenAddress: the address of the token to withdraw
* @param _tokenAmount: the number of tokens to withdraw
* @dev This function is only callable by admin.
*/
function recoverWrongTokens(address _tokenAddress, uint256 _tokenAmount) external onlyOwner {
require(_tokenAddress != address(stakedToken), "Cannot be staked token");
require(_tokenAddress != address(rewardToken), "Cannot be reward token");
IERC20(_tokenAddress).safeTransfer(msg.sender, _tokenAmount);
}
/*
* @notice Stop rewards
* @dev Only callable by owner
*/
function stopReward() external onlyOwner {
endTime = block.timestamp;
}
/*
* @notice Stop Freeze
* @dev Only callable by owner
*/
function stopFreeze() external onlyOwner {
freezeStartTime = 0;
freezeEndTime = 0;
}
/*
* @notice Update reward per second
* @dev Only callable by owner.
* @param _rewardPerSecond: the reward per second
*/
function setRewardPerSecond(uint256 _rewardPerSecond) external onlyOwner {
_updatePool();
rewardPerSecond = _rewardPerSecond;
}
/**
* @notice It allows the admin to update start and end time
* @dev This function is only callable by owner.
* @param _startTime: the new start time
* @param _endTime: the new end time
*/
function setStartAndEndTimes(uint256 _startTime, uint256 _endTime) external onlyOwner {
require(block.timestamp > endTime, "Pool has started");
require(_startTime < _endTime, "Invalid start and end block");
endTime = _endTime;
if (_startTime > block.timestamp) {
startTime = _startTime;
// Set the lastRewardTime as the startTime
lastRewardTime = startTime;
}
}
/**
* @notice It allows the admin to update freeze start and end time
* @dev This function is only callable by owner.
* @param _freezeStartTime: the new freeze start time
* @param _freezeEndTime: the new freeze end time
*/
function setFreezaTimes(uint256 _freezeStartTime, uint256 _freezeEndTime) external onlyOwner {
require(_freezeStartTime < _freezeEndTime, "Invalid start and end time");
require(block.timestamp < _freezeStartTime, "Invalid start and current");
freezeStartTime = _freezeStartTime;
freezeEndTime = _freezeEndTime;
}
/*
* @notice Update pool limit per user
* @dev Only callable by owner.
* @param _poolLimitPerUser: new pool limit per user
*/
function setPoolLimitPerUser(uint256 _poolLimitPerUser) external onlyOwner {
poolLimitPerUser = _poolLimitPerUser;
}
/**
* @notice Update minimum deposit amount
* @dev This function is only callable by owner.
* @param _minDepositAmount: the new minimum deposit amount
*/
function setMinDepositAmount(uint256 _minDepositAmount) external onlyOwner {
minDepositAmount = _minDepositAmount;
}
/*
* @notice Stop rewards
* @dev Only callable by owner. Needs to be for emergency.
*/
function safeWithdrawReward(uint256 _amount) external onlyOwner {
totalRewardTokens -= _amount;
rewardToken.safeTransfer(msg.sender, _amount);
}
/**
* @dev Emergency case withdraw tokens
* @param _token token address
* @param _to destination address
* @param _amount token amount
*/
function emergencyWithdrawTokens(address _token, address _to, uint256 _amount) external onlyOwner {
IERC20(_token).safeTransfer(_to, _amount);
}
/*
* @notice Update reward variables of the given pool to be up-to-date.
*/
function _updatePool() private {
if (block.timestamp <= lastRewardTime) {
return;
}
if (totalStakingTokens == 0) {
lastRewardTime = block.timestamp;
return;
}
uint256 multiplier = _getMultiplier(lastRewardTime, block.timestamp);
uint256 tokenReward = multiplier * rewardPerSecond;
accTokenPerShare += (tokenReward * _PRECISION_FACTOR) / totalStakingTokens;
lastRewardTime = block.timestamp;
}
/*
* @notice Return reward multiplier over the given _from to _to time.
* @param _from: time to start
* @param _to: time to finish
*/
function _getMultiplier(uint256 _from, uint256 _to) private view returns (uint256) {
if (_to <= endTime) {
return _to - _from;
} else if (_from >= endTime) {
return 0;
} else {
return endTime - _from;
}
}
/*
* @notice Transfer reward tokens.
* @param _to: address where tokens will transfer
* @param _amount: amount of tokens
*/
function _safeRewardTransfer(address _to, uint256 _amount) private {
uint256 rewardTokenBal = totalRewardTokens;
if (_amount > rewardTokenBal) {
totalRewardTokens -= rewardTokenBal;
rewardToken.safeTransfer(_to, rewardTokenBal);
} else {
totalRewardTokens -= _amount;
rewardToken.safeTransfer(_to, _amount);
}
}
}