From 12c5c6cb8e50a81bb744c17441cc42ced70a4400 Mon Sep 17 00:00:00 2001 From: Clinton Ennis Date: Tue, 28 Apr 2020 17:58:01 +1000 Subject: [PATCH] Add iETHRewards --- contracts/IRewardDistributionRecipient.sol | 2 +- contracts/iETHRewards.sol | 134 ++++ deployments/iETHRewards.full.abi | 1 + deployments/iETHRewards.full.bin | 1 + deployments/iETHRewards.full.sol | 686 +++++++++++++++++++++ package.json | 3 +- 6 files changed, 825 insertions(+), 2 deletions(-) create mode 100644 contracts/iETHRewards.sol create mode 100644 deployments/iETHRewards.full.abi create mode 100644 deployments/iETHRewards.full.bin create mode 100644 deployments/iETHRewards.full.sol diff --git a/contracts/IRewardDistributionRecipient.sol b/contracts/IRewardDistributionRecipient.sol index ea5e015..1143975 100644 --- a/contracts/IRewardDistributionRecipient.sol +++ b/contracts/IRewardDistributionRecipient.sol @@ -4,7 +4,7 @@ import "@openzeppelin/contracts/ownership/Ownable.sol"; contract IRewardDistributionRecipient is Ownable { - address rewardDistribution; + address public rewardDistribution; function notifyRewardAmount(uint256 reward) external; diff --git a/contracts/iETHRewards.sol b/contracts/iETHRewards.sol new file mode 100644 index 0000000..b69acc0 --- /dev/null +++ b/contracts/iETHRewards.sol @@ -0,0 +1,134 @@ +pragma solidity ^0.5.0; + +import "@openzeppelin/contracts/math/Math.sol"; +import "@openzeppelin/contracts/math/SafeMath.sol"; +import "@openzeppelin/contracts/ownership/Ownable.sol"; +import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; +import "./IRewardDistributionRecipient.sol"; + +contract LPTokenWrapper { + using SafeMath for uint256; + using SafeERC20 for IERC20; + + IERC20 public token = IERC20(0xA9859874e1743A32409f75bB11549892138BBA1E); + + uint256 private _totalSupply; + mapping(address => uint256) private _balances; + + function totalSupply() public view returns (uint256) { + return _totalSupply; + } + + function balanceOf(address account) public view returns (uint256) { + return _balances[account]; + } + + function stake(uint256 amount) public { + _totalSupply = _totalSupply.add(amount); + _balances[msg.sender] = _balances[msg.sender].add(amount); + token.safeTransferFrom(msg.sender, address(this), amount); + } + + function withdraw(uint256 amount) public { + _totalSupply = _totalSupply.sub(amount); + _balances[msg.sender] = _balances[msg.sender].sub(amount); + token.safeTransfer(msg.sender, amount); + } +} + +contract iETHRewards is LPTokenWrapper, IRewardDistributionRecipient { + IERC20 public snx = IERC20(0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F); + uint256 public constant DURATION = 7 days; + + uint256 public periodFinish = 0; + uint256 public rewardRate = 0; + uint256 public lastUpdateTime; + uint256 public rewardPerTokenStored; + mapping(address => uint256) public userRewardPerTokenPaid; + mapping(address => uint256) public rewards; + + 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); + + modifier updateReward(address account) { + rewardPerTokenStored = rewardPerToken(); + lastUpdateTime = lastTimeRewardApplicable(); + if (account != address(0)) { + rewards[account] = earned(account); + userRewardPerTokenPaid[account] = rewardPerTokenStored; + } + _; + } + + function lastTimeRewardApplicable() public view returns (uint256) { + return Math.min(block.timestamp, periodFinish); + } + + function rewardPerToken() public view 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 returns (uint256) { + return + balanceOf(account) + .mul(rewardPerToken().sub(userRewardPerTokenPaid[account])) + .div(1e18) + .add(rewards[account]); + } + + // stake visibility is public as overriding LPTokenWrapper's stake() function + function stake(uint256 amount) public updateReward(msg.sender) { + require(amount > 0, "Cannot stake 0"); + super.stake(amount); + emit Staked(msg.sender, amount); + } + + function withdraw(uint256 amount) public updateReward(msg.sender) { + require(amount > 0, "Cannot withdraw 0"); + super.withdraw(amount); + emit Withdrawn(msg.sender, amount); + } + + function exit() external { + withdraw(balanceOf(msg.sender)); + getReward(); + } + + function getReward() public updateReward(msg.sender) { + uint256 reward = earned(msg.sender); + if (reward > 0) { + rewards[msg.sender] = 0; + snx.safeTransfer(msg.sender, reward); + emit RewardPaid(msg.sender, reward); + } + } + + function notifyRewardAmount(uint256 reward) + external + onlyRewardDistribution + updateReward(address(0)) + { + if (block.timestamp >= periodFinish) { + rewardRate = reward.div(DURATION); + } else { + uint256 remaining = periodFinish.sub(block.timestamp); + uint256 leftover = remaining.mul(rewardRate); + rewardRate = reward.add(leftover).div(DURATION); + } + lastUpdateTime = block.timestamp; + periodFinish = block.timestamp.add(DURATION); + emit RewardAdded(reward); + } +} diff --git a/deployments/iETHRewards.full.abi b/deployments/iETHRewards.full.abi new file mode 100644 index 0000000..36abb73 --- /dev/null +++ b/deployments/iETHRewards.full.abi @@ -0,0 +1 @@ +[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"RewardAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"RewardPaid","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdrawn","type":"event"},{"constant":true,"inputs":[],"name":"DURATION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"earned","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"exit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"getReward","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"lastTimeRewardApplicable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"lastUpdateTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"reward","type":"uint256"}],"name":"notifyRewardAmount","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"periodFinish","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"rewardDistribution","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"rewardPerToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"rewardPerTokenStored","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"rewardRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_rewardDistribution","type":"address"}],"name":"setRewardDistribution","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"snx","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userRewardPerTokenPaid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}] \ No newline at end of file diff --git a/deployments/iETHRewards.full.bin 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\ No newline at end of file diff --git a/deployments/iETHRewards.full.sol b/deployments/iETHRewards.full.sol new file mode 100644 index 0000000..e5a4d76 --- /dev/null +++ b/deployments/iETHRewards.full.sol @@ -0,0 +1,686 @@ + +// File: @openzeppelin/contracts/math/Math.sol + +pragma solidity ^0.5.0; + +/** + * @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); + } +} + +// File: @openzeppelin/contracts/math/SafeMath.sol + +pragma solidity ^0.5.0; + +/** + * @dev Wrappers over Solidity's arithmetic operations with added overflow + * checks. + * + * Arithmetic operations in Solidity wrap on overflow. This can easily result + * in bugs, because programmers usually assume that an overflow raises an + * error, which is the standard behavior in high level programming languages. + * `SafeMath` restores this intuition by reverting the transaction when an + * operation overflows. + * + * Using this library instead of the unchecked operations eliminates an entire + * class of bugs, so it's recommended to use it always. + */ +library SafeMath { + /** + * @dev Returns the addition of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `+` operator. + * + * Requirements: + * - Addition cannot overflow. + */ + function add(uint256 a, uint256 b) internal pure returns (uint256) { + uint256 c = a + b; + require(c >= a, "SafeMath: addition overflow"); + + return c; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b) internal pure returns (uint256) { + return sub(a, b, "SafeMath: subtraction overflow"); + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting with custom message on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * - Subtraction cannot overflow. + * + * _Available since v2.4.0._ + */ + function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b <= a, errorMessage); + uint256 c = a - b; + + return c; + } + + /** + * @dev Returns the multiplication of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `*` operator. + * + * Requirements: + * - Multiplication cannot overflow. + */ + function mul(uint256 a, uint256 b) internal pure returns (uint256) { + // Gas optimization: this is cheaper than requiring 'a' not being zero, but the + // benefit is lost if 'b' is also tested. + // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 + if (a == 0) { + return 0; + } + + uint256 c = a * b; + require(c / a == b, "SafeMath: multiplication overflow"); + + return c; + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b) internal pure returns (uint256) { + return div(a, b, "SafeMath: division by zero"); + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts with custom message on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * - The divisor cannot be zero. + * + * _Available since v2.4.0._ + */ + function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + // Solidity only automatically asserts when dividing by 0 + require(b > 0, errorMessage); + uint256 c = a / b; + // assert(a == b * c + a % b); // There is no case in which this doesn't hold + + return c; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b) internal pure returns (uint256) { + return mod(a, b, "SafeMath: modulo by zero"); + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts with custom message when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * - The divisor cannot be zero. + * + * _Available since v2.4.0._ + */ + function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b != 0, errorMessage); + return a % b; + } +} + +// File: @openzeppelin/contracts/GSN/Context.sol + +pragma solidity ^0.5.0; + +/* + * @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 GSN meta-transactions the account sending and + * paying for execution may not be the actual sender (as far as an application + * is concerned). + * + * This contract is only required for intermediate, library-like contracts. + */ +contract Context { + // Empty internal constructor, to prevent people from mistakenly deploying + // an instance of this contract, which should be used via inheritance. + constructor () internal { } + // solhint-disable-previous-line no-empty-blocks + + function _msgSender() internal view returns (address payable) { + return msg.sender; + } + + function _msgData() internal view returns (bytes memory) { + this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 + return msg.data; + } +} + +// File: @openzeppelin/contracts/ownership/Ownable.sol + +pragma solidity ^0.5.0; + +/** + * @dev Contract module which provides a basic access control mechanism, where + * there is an account (an owner) that can be granted exclusive access to + * specific functions. + * + * This module is used through inheritance. It will make available the modifier + * `onlyOwner`, which can be applied to your functions to restrict their use to + * the owner. + */ +contract Ownable is Context { + address private _owner; + + event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); + + /** + * @dev Initializes the contract setting the deployer as the initial owner. + */ + constructor () internal { + _owner = _msgSender(); + emit OwnershipTransferred(address(0), _owner); + } + + /** + * @dev Returns the address of the current owner. + */ + function owner() public view returns (address) { + return _owner; + } + + /** + * @dev Throws if called by any account other than the owner. + */ + modifier onlyOwner() { + require(isOwner(), "Ownable: caller is not the owner"); + _; + } + + /** + * @dev Returns true if the caller is the current owner. + */ + function isOwner() public view returns (bool) { + return _msgSender() == _owner; + } + + /** + * @dev Leaves the contract without owner. It will not be possible to call + * `onlyOwner` functions anymore. Can only be called by the current owner. + * + * NOTE: Renouncing ownership will leave the contract without an owner, + * thereby removing any functionality that is only available to the owner. + */ + function renounceOwnership() public onlyOwner { + emit OwnershipTransferred(_owner, address(0)); + _owner = address(0); + } + + /** + * @dev Transfers ownership of the contract to a new account (`newOwner`). + * Can only be called by the current owner. + */ + function transferOwnership(address newOwner) public onlyOwner { + _transferOwnership(newOwner); + } + + /** + * @dev Transfers ownership of the contract to a new account (`newOwner`). + */ + function _transferOwnership(address newOwner) internal { + require(newOwner != address(0), "Ownable: new owner is the zero address"); + emit OwnershipTransferred(_owner, newOwner); + _owner = newOwner; + } +} + +// File: @openzeppelin/contracts/token/ERC20/IERC20.sol + +pragma solidity ^0.5.0; + +/** + * @dev Interface of the ERC20 standard as defined in the EIP. Does not include + * the optional functions; to access them see {ERC20Detailed}. + */ +interface IERC20 { + /** + * @dev Returns the amount of tokens in existence. + */ + function totalSupply() external view returns (uint256); + + /** + * @dev Returns the amount of tokens owned by `account`. + */ + function balanceOf(address account) external view returns (uint256); + + /** + * @dev Moves `amount` tokens from the caller's account to `recipient`. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transfer(address recipient, uint256 amount) external returns (bool); + + /** + * @dev 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); +} + +// File: @openzeppelin/contracts/utils/Address.sol + +pragma solidity ^0.5.5; + +/** + * @dev Collection of functions related to the address type + */ +library Address { + /** + * @dev Returns true if `account` is a contract. + * + * This test is non-exhaustive, and there may be false-negatives: during the + * execution of a contract's constructor, its address will be reported as + * not containing a contract. + * + * IMPORTANT: It is unsafe to assume that an address for which this + * function returns false is an externally-owned account (EOA) and not a + * contract. + */ + function isContract(address account) internal view returns (bool) { + // This method relies in extcodesize, which returns 0 for contracts in + // construction, since the code is only stored at the end of the + // constructor execution. + + // According to EIP-1052, 0x0 is the value returned for not-yet created accounts + // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned + // for accounts without code, i.e. `keccak256('')` + bytes32 codehash; + bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; + // solhint-disable-next-line no-inline-assembly + assembly { codehash := extcodehash(account) } + return (codehash != 0x0 && codehash != accountHash); + } + + /** + * @dev Converts an `address` into `address payable`. Note that this is + * simply a type cast: the actual underlying value is not changed. + * + * _Available since v2.4.0._ + */ + function toPayable(address account) internal pure returns (address payable) { + return address(uint160(account)); + } + + /** + * @dev Replacement for Solidity's `transfer`: sends `amount` wei to + * `recipient`, forwarding all available gas and reverting on errors. + * + * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost + * of certain opcodes, possibly making contracts go over the 2300 gas limit + * imposed by `transfer`, making them unable to receive funds via + * `transfer`. {sendValue} removes this limitation. + * + * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. + * + * IMPORTANT: because control is transferred to `recipient`, care must be + * taken to not create reentrancy vulnerabilities. Consider using + * {ReentrancyGuard} or the + * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. + * + * _Available since v2.4.0._ + */ + function sendValue(address payable recipient, uint256 amount) internal { + require(address(this).balance >= amount, "Address: insufficient balance"); + + // solhint-disable-next-line avoid-call-value + (bool success, ) = recipient.call.value(amount)(""); + require(success, "Address: unable to send value, recipient may have reverted"); + } +} + +// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol + +pragma solidity ^0.5.0; + + + + +/** + * @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 ERC20;` statement to your contract, + * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. + */ +library SafeERC20 { + using SafeMath for uint256; + 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)); + } + + 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).add(value); + callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); + } + + function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { + uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); + 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. + + // A Solidity high level call has three parts: + // 1. The target address is checked to verify it contains contract code + // 2. The call itself is made, and success asserted + // 3. The return value is decoded, which in turn checks the size of the returned data. + // solhint-disable-next-line max-line-length + require(address(token).isContract(), "SafeERC20: call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = address(token).call(data); + require(success, "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"); + } + } +} + +// File: contracts/IRewardDistributionRecipient.sol + +pragma solidity ^0.5.0; + + + +contract IRewardDistributionRecipient is Ownable { + address public rewardDistribution; + + function notifyRewardAmount(uint256 reward) external; + + modifier onlyRewardDistribution() { + require(_msgSender() == rewardDistribution, "Caller is not reward distribution"); + _; + } + + function setRewardDistribution(address _rewardDistribution) + external + onlyOwner + { + rewardDistribution = _rewardDistribution; + } +} + +// File: contracts/iETHRewards.sol + +pragma solidity ^0.5.0; + + + + + + +contract LPTokenWrapper { + using SafeMath for uint256; + using SafeERC20 for IERC20; + + IERC20 public token = IERC20(0xA9859874e1743A32409f75bB11549892138BBA1E); + + uint256 private _totalSupply; + mapping(address => uint256) private _balances; + + function totalSupply() public view returns (uint256) { + return _totalSupply; + } + + function balanceOf(address account) public view returns (uint256) { + return _balances[account]; + } + + function stake(uint256 amount) public { + _totalSupply = _totalSupply.add(amount); + _balances[msg.sender] = _balances[msg.sender].add(amount); + token.safeTransferFrom(msg.sender, address(this), amount); + } + + function withdraw(uint256 amount) public { + _totalSupply = _totalSupply.sub(amount); + _balances[msg.sender] = _balances[msg.sender].sub(amount); + token.safeTransfer(msg.sender, amount); + } +} + +contract iETHRewards is LPTokenWrapper, IRewardDistributionRecipient { + IERC20 public snx = IERC20(0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F); + uint256 public constant DURATION = 7 days; + + uint256 public periodFinish = 0; + uint256 public rewardRate = 0; + uint256 public lastUpdateTime; + uint256 public rewardPerTokenStored; + mapping(address => uint256) public userRewardPerTokenPaid; + mapping(address => uint256) public rewards; + + 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); + + modifier updateReward(address account) { + rewardPerTokenStored = rewardPerToken(); + lastUpdateTime = lastTimeRewardApplicable(); + if (account != address(0)) { + rewards[account] = earned(account); + userRewardPerTokenPaid[account] = rewardPerTokenStored; + } + _; + } + + function lastTimeRewardApplicable() public view returns (uint256) { + return Math.min(block.timestamp, periodFinish); + } + + function rewardPerToken() public view 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 returns (uint256) { + return + balanceOf(account) + .mul(rewardPerToken().sub(userRewardPerTokenPaid[account])) + .div(1e18) + .add(rewards[account]); + } + + // stake visibility is public as overriding LPTokenWrapper's stake() function + function stake(uint256 amount) public updateReward(msg.sender) { + require(amount > 0, "Cannot stake 0"); + super.stake(amount); + emit Staked(msg.sender, amount); + } + + function withdraw(uint256 amount) public updateReward(msg.sender) { + require(amount > 0, "Cannot withdraw 0"); + super.withdraw(amount); + emit Withdrawn(msg.sender, amount); + } + + function exit() external { + withdraw(balanceOf(msg.sender)); + getReward(); + } + + function getReward() public updateReward(msg.sender) { + uint256 reward = earned(msg.sender); + if (reward > 0) { + rewards[msg.sender] = 0; + snx.safeTransfer(msg.sender, reward); + emit RewardPaid(msg.sender, reward); + } + } + + function notifyRewardAmount(uint256 reward) + external + onlyRewardDistribution + updateReward(address(0)) + { + if (block.timestamp >= periodFinish) { + rewardRate = reward.div(DURATION); + } else { + uint256 remaining = periodFinish.sub(block.timestamp); + uint256 leftover = remaining.mul(rewardRate); + rewardRate = reward.add(leftover).div(DURATION); + } + lastUpdateTime = block.timestamp; + periodFinish = block.timestamp.add(DURATION); + emit RewardAdded(reward); + } +} diff --git a/package.json b/package.json index ca04c64..85102b2 100644 --- a/package.json +++ b/package.json @@ -38,6 +38,7 @@ "lint": "npm run lint:js && npm run lint:sol", "lint:fix": "npm run lint:js:fix && npm run lint:sol:fix", "dist": "truffle-flattener ./contracts/Unipool.sol > Unipool.full.sol && solcjs --bin --abi --optimize Unipool.full.sol && mv Unipool_full_sol_Unipool.bin Unipool.full.bin && mv Unipool_full_sol_Unipool.abi Unipool.full.abi && rm *_sol_*", - "dist:CurveRewards": "truffle-flattener ./contracts/CurveRewards.sol > CurveRewards.full.sol && solcjs --bin --abi --optimize CurveRewards.full.sol && mv CurveRewards.full.sol ./deployments/CurveRewards.full.sol && mv CurveRewards_full_sol_CurveRewards.bin ./deployments/CurveRewards.full.bin && mv CurveRewards_full_sol_CurveRewards.abi ./deployments/CurveRewards.full.abi && rm *_sol_*" + "dist:CurveRewards": "truffle-flattener ./contracts/CurveRewards.sol > CurveRewards.full.sol && solcjs --bin --abi --optimize CurveRewards.full.sol && mv CurveRewards.full.sol ./deployments/CurveRewards.full.sol && mv CurveRewards_full_sol_CurveRewards.bin ./deployments/CurveRewards.full.bin && mv CurveRewards_full_sol_CurveRewards.abi ./deployments/CurveRewards.full.abi && rm *_sol_*", + "dist:iETHRewards": "truffle-flattener ./contracts/iETHRewards.sol > iETHRewards.full.sol && solcjs --bin --abi --optimize iETHRewards.full.sol && mv iETHRewards.full.sol ./deployments/iETHRewards.full.sol && mv iETHRewards_full_sol_iETHRewards.bin ./deployments/iETHRewards.full.bin && mv iETHRewards_full_sol_iETHRewards.abi ./deployments/iETHRewards.full.abi && rm *_sol_*" } }