Contract Name:
SmartChefInitializable
Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)
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 `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 `from` to `to` 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 from,
address to,
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
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @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
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
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
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "./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() {
_transferOwnership(_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 {
_transferOwnership(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");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../Interface8/IERC20.sol";
import "./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");
}
}
}
pragma solidity ^0.8.0;
import "./Interface8/IERC20Metadata.sol";
import "./Lib8/Ownable.sol";
import "./Lib8/SafeERC20.sol";
import "./Lib8/ReentrancyGuard.sol";
contract SmartChefInitializable is Ownable, ReentrancyGuard {
using SafeERC20 for IERC20Metadata;
// The address of the smart chef factory
address public immutable SMART_CHEF_FACTORY;
// Whether a limit is set for users
bool public userLimit;
// Whether it is initialized
bool public isInitialized;
// Accrued token per share
uint256 public accTokenPerShare;
// The block number when ZINU mining ends.
uint256 public bonusEndBlock;
// The block number when ZINU mining starts.
uint256 public startBlock;
// The block number of the last pool update
uint256 public lastRewardBlock;
// The pool limit (0 if none)
uint256 public poolLimitPerUser;
// Block numbers available for user limit (after start block)
uint256 public numberBlocksForUserLimit;
// ZINU tokens created per block.
uint256 public rewardPerBlock;
// The precision factor
uint256 public PRECISION_FACTOR;
// The reward token
IERC20Metadata public rewardToken;
// The staked token
IERC20Metadata public stakedToken;
// Info of each user that stakes tokens (stakedToken)
mapping(address => UserInfo) public userInfo;
// staked amount
uint256 public stakedTokenSupply;
struct UserInfo {
uint256 amount; // How many staked tokens the user has provided
uint256 rewardDebt; // Reward debt
}
event Deposit(address indexed user, uint256 amount);
event EmergencyWithdraw(address indexed user, uint256 amount);
event NewStartAndEndBlocks(uint256 startBlock, uint256 endBlock);
event NewRewardPerBlock(uint256 rewardPerBlock);
event NewPoolLimit(uint256 poolLimitPerUser);
event RewardsStop(uint256 blockNumber);
event TokenRecovery(address indexed token, uint256 amount);
event Withdraw(address indexed user, uint256 amount);
/**
* @notice Constructor
*/
constructor() {
SMART_CHEF_FACTORY = msg.sender;
}
/*
* @notice Initialize the contract
* @param _stakedToken: staked token address
* @param _rewardToken: reward token address
* @param _rewardPerBlock: reward per block (in rewardToken)
* @param _startBlock: start block
* @param _bonusEndBlock: end block
* @param _poolLimitPerUser: pool limit per user in stakedToken (if any, else 0)
* @param _numberBlocksForUserLimit: block numbers available for user limit (after start block)
* @param _admin: admin address with ownership
*/
function initialize(
IERC20Metadata _stakedToken,
IERC20Metadata _rewardToken,
uint256 _rewardPerBlock,
uint256 _startBlock,
uint256 _bonusEndBlock,
uint256 _poolLimitPerUser,
uint256 _numberBlocksForUserLimit,
address _admin
) external {
require(!isInitialized, "Already initialized");
require(msg.sender == SMART_CHEF_FACTORY, "Not factory");
// Make this contract initialized
isInitialized = true;
stakedToken = _stakedToken;
rewardToken = _rewardToken;
rewardPerBlock = _rewardPerBlock;
startBlock = _startBlock;
bonusEndBlock = _bonusEndBlock;
if (_poolLimitPerUser > 0) {
userLimit = true;
poolLimitPerUser = _poolLimitPerUser;
numberBlocksForUserLimit = _numberBlocksForUserLimit;
}
uint256 decimalsRewardToken = uint256(rewardToken.decimals());
require(decimalsRewardToken < 30, "Must be less than 30");
PRECISION_FACTOR = uint256(10**(uint256(30) - decimalsRewardToken));
// Set the lastRewardBlock as the startBlock
lastRewardBlock = startBlock;
stakedTokenSupply = 0;
// Transfer ownership to the admin address who becomes owner of the contract
transferOwnership(_admin);
}
/*
* @notice Deposit staked tokens and collect reward tokens (if any)
* @param _amount: amount to withdraw (in rewardToken)
*/
function deposit(uint256 _amount) external nonReentrant {
UserInfo storage user = userInfo[msg.sender];
userLimit = hasUserLimit();
require(!userLimit || ((_amount + user.amount) <= poolLimitPerUser), "Deposit: Amount above limit");
_updatePool();
if (user.amount > 0) {
uint256 pending = (user.amount * accTokenPerShare) / PRECISION_FACTOR - user.rewardDebt;
if (pending > 0) {
rewardToken.safeTransfer(address(msg.sender), pending);
}
}
if (_amount > 0) {
uint256 before = stakedToken.balanceOf(address(this));
stakedToken.safeTransferFrom(address(msg.sender), address(this), _amount);
_amount = stakedToken.balanceOf(address(this)) - before;
user.amount = user.amount + _amount;
stakedTokenSupply = stakedTokenSupply + _amount;
}
user.rewardDebt = (user.amount * accTokenPerShare) / PRECISION_FACTOR;
emit Deposit(msg.sender, _amount);
}
/*
* @notice Withdraw staked tokens and collect reward tokens
* @param _amount: amount to withdraw (in rewardToken)
*/
function withdraw(uint256 _amount) external nonReentrant {
UserInfo storage user = userInfo[msg.sender];
require(user.amount >= _amount, "Amount to withdraw too high");
_updatePool();
uint256 pending = (user.amount * accTokenPerShare) / PRECISION_FACTOR - user.rewardDebt;
if (_amount > 0) {
user.amount = user.amount - _amount;
stakedToken.safeTransfer(address(msg.sender), _amount);
stakedTokenSupply = stakedTokenSupply - _amount;
}
if (pending > 0) {
rewardToken.safeTransfer(address(msg.sender), pending);
}
user.rewardDebt = (user.amount * accTokenPerShare) / PRECISION_FACTOR;
emit Withdraw(msg.sender, _amount);
}
/*
* @notice Withdraw staked tokens without caring about rewards rewards
* @dev Needs to be for emergency.
*/
function emergencyWithdraw() external nonReentrant {
UserInfo storage user = userInfo[msg.sender];
uint256 amountToTransfer = user.amount;
user.amount = 0;
user.rewardDebt = 0;
if (amountToTransfer > 0) {
stakedToken.safeTransfer(address(msg.sender), amountToTransfer);
stakedTokenSupply = stakedTokenSupply - amountToTransfer;
}
emit EmergencyWithdraw(msg.sender, user.amount);
}
/*
* @notice Stop rewards
* @dev Only callable by owner. Needs to be for emergency.
*/
function emergencyRewardWithdraw(uint256 _amount) external onlyOwner {
rewardToken.safeTransfer(address(msg.sender), _amount);
}
/**
* @notice Allows the owner to recover tokens sent to the contract by mistake
* @param _token: token address
* @dev Callable by owner
*/
function recoverToken(address _token) external onlyOwner {
require(_token != address(stakedToken), "Operations: Cannot recover staked token");
require(_token != address(rewardToken), "Operations: Cannot recover reward token");
uint256 balance = IERC20Metadata(_token).balanceOf(address(this));
require(balance != 0, "Operations: Cannot recover zero balance");
IERC20Metadata(_token).safeTransfer(address(msg.sender), balance);
emit TokenRecovery(_token, balance);
}
/*
* @notice Stop rewards
* @dev Only callable by owner
*/
function stopReward() external onlyOwner {
bonusEndBlock = block.number;
}
/*
* @notice Update pool limit per user
* @dev Only callable by owner.
* @param _userLimit: whether the limit remains forced
* @param _poolLimitPerUser: new pool limit per user
*/
function updatePoolLimitPerUser(bool _userLimit, uint256 _poolLimitPerUser) external onlyOwner {
require(userLimit, "Must be set");
if (_userLimit) {
require(_poolLimitPerUser > poolLimitPerUser, "New limit must be higher");
poolLimitPerUser = _poolLimitPerUser;
} else {
userLimit = _userLimit;
poolLimitPerUser = 0;
}
emit NewPoolLimit(poolLimitPerUser);
}
/*
* @notice Update reward per block
* @dev Only callable by owner.
* @param _rewardPerBlock: the reward per block
*/
function updateRewardPerBlock(uint256 _rewardPerBlock) external onlyOwner {
require(block.number < startBlock, "Pool has started");
rewardPerBlock = _rewardPerBlock;
emit NewRewardPerBlock(_rewardPerBlock);
}
/**
* @notice It allows the admin to update start and end blocks
* @dev This function is only callable by owner.
* @param _startBlock: the new start block
* @param _bonusEndBlock: the new end block
*/
function updateStartAndEndBlocks(uint256 _startBlock, uint256 _bonusEndBlock) external onlyOwner {
require(block.number < startBlock, "Pool has started");
require(_startBlock < _bonusEndBlock, "New startBlock must be lower than new endBlock");
require(block.number < _startBlock, "New startBlock must be higher than current block");
startBlock = _startBlock;
bonusEndBlock = _bonusEndBlock;
// Set the lastRewardBlock as the startBlock
lastRewardBlock = startBlock;
emit NewStartAndEndBlocks(_startBlock, _bonusEndBlock);
}
/*
* @notice View function to see pending reward on frontend.
* @param _user: user address
* @return Pending reward for a given user
*/
function pendingReward(address _user) external view returns (uint256) {
UserInfo storage user = userInfo[_user];
if (block.number > lastRewardBlock && stakedTokenSupply != 0) {
uint256 multiplier = _getMultiplier(lastRewardBlock, block.number);
uint256 zinuReward = multiplier * rewardPerBlock;
uint256 adjustedTokenPerShare = accTokenPerShare + (zinuReward * PRECISION_FACTOR) / stakedTokenSupply;
return (user.amount * adjustedTokenPerShare) / PRECISION_FACTOR - user.rewardDebt;
} else {
return (user.amount * accTokenPerShare) / PRECISION_FACTOR - user.rewardDebt;
}
}
/*
* @notice Update reward variables of the given pool to be up-to-date.
*/
function _updatePool() internal {
if (block.number <= lastRewardBlock) {
return;
}
if (stakedTokenSupply == 0) {
lastRewardBlock = block.number;
return;
}
uint256 multiplier = _getMultiplier(lastRewardBlock, block.number);
uint256 zinuReward = multiplier * rewardPerBlock;
accTokenPerShare = accTokenPerShare + (zinuReward * PRECISION_FACTOR) / stakedTokenSupply;
lastRewardBlock = block.number;
}
/*
* @notice Return reward multiplier over the given _from to _to block.
* @param _from: block to start
* @param _to: block to finish
*/
function _getMultiplier(uint256 _from, uint256 _to) internal view returns (uint256) {
if (_to <= bonusEndBlock) {
return _to - _from;
} else if (_from >= bonusEndBlock) {
return 0;
} else {
return bonusEndBlock - _from;
}
}
/*
* @notice Return user limit is set or zero.
*/
function hasUserLimit() public view returns (bool) {
if (!userLimit || (block.number >= (startBlock + numberBlocksForUserLimit))) {
return false;
}
return true;
}
}
