Address Details
contract
0x9D87c01672A7D02b2Dc0D0eB7A145C7e13793c3B
- Contract Name
- MoolaStakingRewards
- Creator
- 0x0b4832–2d931a at 0xa28f97–89ec98
- Balance
- 1,211.630293249487097836 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 71,277 Transactions
- Transfers
- 337,350 Transfers
- Gas Used
- 14,091,147,192
- Last Balance Update
- 25285587
Transactions
Token Transfers
Tokens
Internal Transactions
Coin Balance History
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- Contract name:
- MoolaStakingRewards
- Optimization enabled
- true
- Compiler version
- v0.8.4+commit.c7e474f2
- Optimization runs
- 999999
- EVM Version
- istanbul
- Verified at
- 2021-09-11T04:36:05.687266Z
Contract source code
// SPDX-License-Identifier: MIT // solhint-disable not-rely-on-time pragma solidity ^0.8.3; import "./ubeswap-farming/openzeppelin-solidity/contracts/Math.sol"; import "./ubeswap-farming/openzeppelin-solidity/contracts/SafeMath.sol"; import "./ubeswap-farming/openzeppelin-solidity/contracts/SafeERC20.sol"; import "./ubeswap-farming/openzeppelin-solidity/contracts/ReentrancyGuard.sol"; // Inheritance import "./ubeswap-farming/synthetix/contracts/interfaces/IStakingRewards.sol"; import "./IMoolaStakingRewards.sol"; import "./ubeswap-farming/synthetix/contracts/RewardsDistributionRecipient.sol"; contract MoolaStakingRewards is IMoolaStakingRewards, RewardsDistributionRecipient, ReentrancyGuard { using SafeMath for uint256; using SafeERC20 for IERC20; /* ========== STATE VARIABLES ========== */ IERC20 public immutable rewardsToken; IERC20 public immutable stakingToken; IERC20[] public externalRewardsTokens; uint256 public periodFinish = 0; uint256 public rewardRate = 0; uint256 public rewardsDuration = 7 days; uint256 public lastUpdateTime; uint256 public rewardPerTokenStored; mapping(address => uint256) public userRewardPerTokenPaid; mapping(address => uint256) public rewards; mapping(address => mapping(IERC20 => uint256)) public externalRewards; mapping(IERC20 => uint256) private externalRewardPerTokenStoredWad; mapping(address => mapping(IERC20 => uint256)) private externalUserRewardPerTokenPaidWad; uint256 private _totalSupply; mapping(address => uint256) private _balances; IStakingRewards public immutable externalStakingRewards; /* ========== CONSTRUCTOR ========== */ constructor( address _owner, address _rewardsDistribution, IERC20 _rewardsToken, IStakingRewards _externalStakingRewards, IERC20[] memory _externalRewardsTokens ) Owned(_owner) { require(_externalRewardsTokens.length > 0, "Empty externalRewardsTokens"); rewardsToken = _rewardsToken; rewardsDistribution = _rewardsDistribution; externalStakingRewards = _externalStakingRewards; externalRewardsTokens = _externalRewardsTokens; stakingToken = _externalStakingRewards.stakingToken(); } /* ========== VIEWS ========== */ function totalSupply() external view override returns (uint256) { return _totalSupply; } function balanceOf(address account) external view override returns (uint256) { return _balances[account]; } function lastTimeRewardApplicable() public view override returns (uint256) { return Math.min(block.timestamp, periodFinish); } function rewardPerToken() public view override returns (uint256) { if (_totalSupply == 0) { return rewardPerTokenStored; } return rewardPerTokenStored.add( lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply) ); } function earned(address account) public view override returns (uint256) { return _balances[account].mul(rewardPerToken().sub(userRewardPerTokenPaid[account])).div(1e18).add(rewards[account]); } function earnedExternal(address account) public override returns (uint256[] memory result) { IERC20[] memory externalTokens = externalRewardsTokens; uint256[] memory externalOldTotalRewards = new uint256[](externalTokens.length); result = new uint256[](externalTokens.length); for (uint256 i = 0; i < externalTokens.length; i++) { externalOldTotalRewards[i] = externalTokens[i].balanceOf(address(this)); } externalStakingRewards.getReward(); for (uint256 i = 0; i < externalTokens.length; i++) { IERC20 externalToken = externalTokens[i]; uint256 externalTotalRewards = externalToken.balanceOf(address(this)); uint256 newExternalRewardsAmount = externalTotalRewards.sub(externalOldTotalRewards[i]); if (_totalSupply > 0) { externalRewardPerTokenStoredWad[externalToken] = externalRewardPerTokenStoredWad[externalToken].add(newExternalRewardsAmount.mul(1e18).div(_totalSupply)); } result[i] = _balances[account] .mul(externalRewardPerTokenStoredWad[externalToken].sub(externalUserRewardPerTokenPaidWad[account][externalToken])) .div(1e18).add(externalRewards[account][externalToken]); externalUserRewardPerTokenPaidWad[account][externalToken] = externalRewardPerTokenStoredWad[externalToken]; externalRewards[account][externalToken] = result[i]; } return result; } function getRewardForDuration() external view override returns (uint256) { return rewardRate.mul(rewardsDuration); } /* ========== MUTATIVE FUNCTIONS ========== */ // XXX: removed notPaused function stake(uint256 amount) external override nonReentrant updateReward(msg.sender) { require(amount > 0, "Cannot stake 0"); _totalSupply = _totalSupply.add(amount); _balances[msg.sender] = _balances[msg.sender].add(amount); stakingToken.safeTransferFrom(msg.sender, address(this), amount); stakingToken.approve(address(externalStakingRewards), amount); externalStakingRewards.stake(amount); emit Staked(msg.sender, amount); } function withdraw(uint256 amount) public override nonReentrant updateReward(msg.sender) { require(amount > 0, "Cannot withdraw 0"); _totalSupply = _totalSupply.sub(amount); _balances[msg.sender] = _balances[msg.sender].sub(amount); externalStakingRewards.withdraw(amount); stakingToken.safeTransfer(msg.sender, amount); emit Withdrawn(msg.sender, amount); } function getReward() public override nonReentrant updateReward(msg.sender) { uint256 reward = rewards[msg.sender]; IERC20[] memory externalTokens = externalRewardsTokens; if (reward > 0) { rewards[msg.sender] = 0; rewardsToken.safeTransfer(msg.sender, reward); emit RewardPaid(msg.sender, reward); } for (uint256 i = 0; i < externalTokens.length; i++) { IERC20 externalToken = externalTokens[i]; uint256 externalReward = externalRewards[msg.sender][externalToken]; if (externalReward > 0) { externalRewards[msg.sender][externalToken] = 0; externalToken.safeTransfer(msg.sender, externalReward); emit ExternalRewardPaid(msg.sender, externalReward); } } } function exit() external override { withdraw(_balances[msg.sender]); getReward(); } /* ========== RESTRICTED FUNCTIONS ========== */ function notifyRewardAmount(uint256 reward) external override onlyRewardsDistribution updateReward(address(0)) { if (block.timestamp >= periodFinish) { rewardRate = reward.div(rewardsDuration); } else { uint256 remaining = periodFinish.sub(block.timestamp); uint256 leftover = remaining.mul(rewardRate); rewardRate = reward.add(leftover).div(rewardsDuration); } // Ensure the provided reward amount is not more than the balance in the contract. // This keeps the reward rate in the right range, preventing overflows due to // very high values of rewardRate in the earned and rewardsPerToken functions; // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow. uint balance = rewardsToken.balanceOf(address(this)); require(rewardRate <= balance.div(rewardsDuration), "Provided reward too high"); lastUpdateTime = block.timestamp; periodFinish = block.timestamp.add(rewardsDuration); emit RewardAdded(reward); } // End rewards emission earlier function updatePeriodFinish(uint timestamp) external onlyOwner updateReward(address(0)) { require(timestamp > lastUpdateTime, "Invalid new period finish"); periodFinish = timestamp; } // Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner { require(tokenAddress != address(stakingToken), "Cannot withdraw the staking token"); IERC20(tokenAddress).safeTransfer(owner, tokenAmount); emit Recovered(tokenAddress, tokenAmount); } function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner { require( block.timestamp > periodFinish, "Previous rewards period must be complete before changing the duration for the new period" ); rewardsDuration = _rewardsDuration; emit RewardsDurationUpdated(rewardsDuration); } /* ========== MODIFIERS ========== */ modifier updateReward(address account) { rewardPerTokenStored = rewardPerToken(); lastUpdateTime = lastTimeRewardApplicable(); if (account != address(0)) { rewards[account] = earned(account); userRewardPerTokenPaid[account] = rewardPerTokenStored; earnedExternal(account); } _; } /* ========== EVENTS ========== */ event RewardAdded(uint256 reward); event Staked(address indexed user, uint256 amount); event Withdrawn(address indexed user, uint256 amount); event RewardPaid(address indexed user, uint256 reward); event ExternalRewardPaid(address indexed user, uint256 reward); event RewardsDurationUpdated(uint256 newDuration); event Recovered(address token, uint256 amount); }
IMoolaStakingRewards.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.4.24; interface IMoolaStakingRewards { // Views function lastTimeRewardApplicable() external view returns (uint256); function rewardPerToken() external view returns (uint256); function earned(address account) external view returns (uint256); function earnedExternal(address account) external returns (uint256[] calldata); function getRewardForDuration() external view returns (uint256); function totalSupply() external view returns (uint256); function balanceOf(address account) external view returns (uint256); // Mutative function stake(uint256 amount) external; function withdraw(uint256 amount) external; function getReward() external; function exit() external; }
Address.sol
// 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; // solhint-disable-next-line no-inline-assembly 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" ); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) private 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 // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
IERC20.sol
// 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 ); }
Math.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow, so we distribute return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2); } }
ReentrancyGuard.sol
// 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; } }
SafeERC20.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./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' // solhint-disable-next-line max-line-length 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 // solhint-disable-next-line max-line-length require( abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed" ); } } }
SafeMath.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; // CAUTION // This version of SafeMath should only be used with Solidity 0.8 or later, // because it relies on the compiler's built in overflow checks. /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler * now has built in overflow checking. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // 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 (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @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) { return a + b; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return a - b; } /** * @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) { return a * b; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b <= a, errorMessage); return a - b; } } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards 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). * * 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, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a / b; } } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * 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, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a % b; } } }
Owned.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.3; // https://docs.synthetix.io/contracts/source/contracts/owned contract Owned { address public owner; address public nominatedOwner; constructor(address _owner) { require(_owner != address(0), "Owner address cannot be 0"); owner = _owner; emit OwnerChanged(address(0), _owner); } function nominateNewOwner(address _owner) external onlyOwner { nominatedOwner = _owner; emit OwnerNominated(_owner); } function acceptOwnership() external { require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership"); emit OwnerChanged(owner, nominatedOwner); owner = nominatedOwner; nominatedOwner = address(0); } modifier onlyOwner { _onlyOwner(); _; } function _onlyOwner() private view { require(msg.sender == owner, "Only the contract owner may perform this action"); } event OwnerNominated(address newOwner); event OwnerChanged(address oldOwner, address newOwner); }
RewardsDistributionRecipient.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.3; // Inheritance import "./Owned.sol"; // https://docs.synthetix.io/contracts/source/contracts/rewardsdistributionrecipient abstract contract RewardsDistributionRecipient is Owned { address public rewardsDistribution; function notifyRewardAmount(uint256 reward) external virtual; modifier onlyRewardsDistribution() { require(msg.sender == rewardsDistribution, "Caller is not RewardsDistribution contract"); _; } function setRewardsDistribution(address _rewardsDistribution) external onlyOwner { rewardsDistribution = _rewardsDistribution; } }
IStakingRewards.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.4.24; import "../../../openzeppelin-solidity/contracts/SafeERC20.sol"; // https://docs.synthetix.io/contracts/source/interfaces/istakingrewards interface IStakingRewards { // Views function rewardsToken() external view returns(IERC20); function stakingToken() external view returns(IERC20); function lastTimeRewardApplicable() external view returns (uint256); function rewardPerToken() external view returns (uint256); function earned(address account) external view returns (uint256); function getRewardForDuration() external view returns (uint256); function totalSupply() external view returns (uint256); function balanceOf(address account) external view returns (uint256); // Mutative function stake(uint256 amount) external; function withdraw(uint256 amount) external; function getReward() external; function exit() external; }
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_owner","internalType":"address"},{"type":"address","name":"_rewardsDistribution","internalType":"address"},{"type":"address","name":"_rewardsToken","internalType":"contract IERC20"},{"type":"address","name":"_externalStakingRewards","internalType":"contract IStakingRewards"},{"type":"address[]","name":"_externalRewardsTokens","internalType":"contract IERC20[]"}]},{"type":"event","name":"ExternalRewardPaid","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"reward","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnerChanged","inputs":[{"type":"address","name":"oldOwner","internalType":"address","indexed":false},{"type":"address","name":"newOwner","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"OwnerNominated","inputs":[{"type":"address","name":"newOwner","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"Recovered","inputs":[{"type":"address","name":"token","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RewardAdded","inputs":[{"type":"uint256","name":"reward","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RewardPaid","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"reward","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RewardsDurationUpdated","inputs":[{"type":"uint256","name":"newDuration","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Staked","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Withdrawn","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"acceptOwnership","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"earned","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"result","internalType":"uint256[]"}],"name":"earnedExternal","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"exit","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"externalRewards","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"address","name":"","internalType":"contract IERC20"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IERC20"}],"name":"externalRewardsTokens","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IStakingRewards"}],"name":"externalStakingRewards","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"getReward","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getRewardForDuration","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"lastTimeRewardApplicable","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"lastUpdateTime","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"nominateNewOwner","inputs":[{"type":"address","name":"_owner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"nominatedOwner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"notifyRewardAmount","inputs":[{"type":"uint256","name":"reward","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"periodFinish","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"recoverERC20","inputs":[{"type":"address","name":"tokenAddress","internalType":"address"},{"type":"uint256","name":"tokenAmount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewardPerToken","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewardPerTokenStored","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewardRate","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewards","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"rewardsDistribution","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewardsDuration","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IERC20"}],"name":"rewardsToken","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setRewardsDistribution","inputs":[{"type":"address","name":"_rewardsDistribution","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setRewardsDuration","inputs":[{"type":"uint256","name":"_rewardsDuration","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"stake","inputs":[{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IERC20"}],"name":"stakingToken","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalSupply","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updatePeriodFinish","inputs":[{"type":"uint256","name":"timestamp","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"userRewardPerTokenPaid","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdraw","inputs":[{"type":"uint256","name":"amount","internalType":"uint256"}]}]
Contract Creation Code
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