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pragma solidity ^0.5.0; |
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|
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/** |
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* @dev Standard math utilities missing in the Solidity language. |
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*/ |
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library Math { |
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/** |
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* @dev Returns the largest of two numbers. |
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*/ |
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function max(uint256 a, uint256 b) internal pure returns (uint256) { |
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return a >= b ? a : b; |
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} |
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|
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/** |
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* @dev Returns the smallest of two numbers. |
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*/ |
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function min(uint256 a, uint256 b) internal pure returns (uint256) { |
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return a < b ? a : b; |
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} |
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|
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/** |
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* @dev Returns the average of two numbers. The result is rounded towards |
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* zero. |
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*/ |
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function average(uint256 a, uint256 b) internal pure returns (uint256) { |
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// (a + b) / 2 can overflow, so we distribute |
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return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2); |
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} |
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} |
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// File: @openzeppelin/contracts/math/SafeMath.sol |
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pragma solidity ^0.5.0; |
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/** |
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* @dev Wrappers over Solidity's arithmetic operations with added overflow |
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* checks. |
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* |
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* Arithmetic operations in Solidity wrap on overflow. This can easily result |
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* in bugs, because programmers usually assume that an overflow raises an |
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* error, which is the standard behavior in high level programming languages. |
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* `SafeMath` restores this intuition by reverting the transaction when an |
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* operation overflows. |
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* |
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* Using this library instead of the unchecked operations eliminates an entire |
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* class of bugs, so it's recommended to use it always. |
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*/ |
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library SafeMath { |
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/** |
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* @dev Returns the addition of two unsigned integers, reverting on |
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* overflow. |
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* |
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* Counterpart to Solidity's `+` operator. |
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* |
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* Requirements: |
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* - Addition cannot overflow. |
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*/ |
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function add(uint256 a, uint256 b) internal pure returns (uint256) { |
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uint256 c = a + b; |
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require(c >= a, "SafeMath: addition overflow"); |
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|
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return c; |
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} |
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|
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/** |
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* @dev Returns the subtraction of two unsigned integers, reverting on |
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* overflow (when the result is negative). |
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* |
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* Counterpart to Solidity's `-` operator. |
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* |
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* Requirements: |
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* - Subtraction cannot overflow. |
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*/ |
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function sub(uint256 a, uint256 b) internal pure returns (uint256) { |
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return sub(a, b, "SafeMath: subtraction overflow"); |
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} |
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|
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/** |
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* @dev Returns the subtraction of two unsigned integers, reverting with custom message on |
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* overflow (when the result is negative). |
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* |
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* Counterpart to Solidity's `-` operator. |
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* |
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* Requirements: |
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* - Subtraction cannot overflow. |
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* |
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* _Available since v2.4.0._ |
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*/ |
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function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { |
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require(b <= a, errorMessage); |
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uint256 c = a - b; |
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return c; |
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} |
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|
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/** |
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* @dev Returns the multiplication of two unsigned integers, reverting on |
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* overflow. |
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* |
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* Counterpart to Solidity's `*` operator. |
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* |
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* Requirements: |
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* - Multiplication cannot overflow. |
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*/ |
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function mul(uint256 a, uint256 b) internal pure returns (uint256) { |
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// Gas optimization: this is cheaper than requiring 'a' not being zero, but the |
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// benefit is lost if 'b' is also tested. |
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// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 |
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if (a == 0) { |
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return 0; |
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} |
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uint256 c = a * b; |
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require(c / a == b, "SafeMath: multiplication overflow"); |
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return c; |
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} |
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/** |
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* @dev Returns the integer division of two unsigned integers. Reverts on |
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* division by zero. The result is rounded towards zero. |
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* |
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* Counterpart to Solidity's `/` operator. Note: this function uses a |
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* `revert` opcode (which leaves remaining gas untouched) while Solidity |
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* uses an invalid opcode to revert (consuming all remaining gas). |
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* |
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* Requirements: |
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* - The divisor cannot be zero. |
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*/ |
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function div(uint256 a, uint256 b) internal pure returns (uint256) { |
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return div(a, b, "SafeMath: division by zero"); |
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} |
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|
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/** |
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* @dev Returns the integer division of two unsigned integers. Reverts with custom message on |
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* division by zero. The result is rounded towards zero. |
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* |
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* Counterpart to Solidity's `/` operator. Note: this function uses a |
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* `revert` opcode (which leaves remaining gas untouched) while Solidity |
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* uses an invalid opcode to revert (consuming all remaining gas). |
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* |
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* Requirements: |
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* - The divisor cannot be zero. |
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* |
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* _Available since v2.4.0._ |
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*/ |
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function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { |
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// Solidity only automatically asserts when dividing by 0 |
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require(b > 0, errorMessage); |
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uint256 c = a / b; |
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// assert(a == b * c + a % b); // There is no case in which this doesn't hold |
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|
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return c; |
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} |
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|
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/** |
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* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), |
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* Reverts when dividing by zero. |
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* |
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* Counterpart to Solidity's `%` operator. This function uses a `revert` |
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* opcode (which leaves remaining gas untouched) while Solidity uses an |
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* invalid opcode to revert (consuming all remaining gas). |
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* |
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* Requirements: |
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* - The divisor cannot be zero. |
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*/ |
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function mod(uint256 a, uint256 b) internal pure returns (uint256) { |
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return mod(a, b, "SafeMath: modulo by zero"); |
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} |
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|
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/** |
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* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), |
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* Reverts with custom message when dividing by zero. |
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* |
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* Counterpart to Solidity's `%` operator. This function uses a `revert` |
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* opcode (which leaves remaining gas untouched) while Solidity uses an |
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* invalid opcode to revert (consuming all remaining gas). |
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* |
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* Requirements: |
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* - The divisor cannot be zero. |
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* |
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* _Available since v2.4.0._ |
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*/ |
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function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { |
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require(b != 0, errorMessage); |
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return a % b; |
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} |
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} |
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// File: @openzeppelin/contracts/GSN/Context.sol |
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pragma solidity ^0.5.0; |
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/* |
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* @dev Provides information about the current execution context, including the |
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* sender of the transaction and its data. While these are generally available |
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* via msg.sender and msg.data, they should not be accessed in such a direct |
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* manner, since when dealing with GSN meta-transactions the account sending and |
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* paying for execution may not be the actual sender (as far as an application |
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* is concerned). |
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* |
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* This contract is only required for intermediate, library-like contracts. |
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*/ |
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contract Context { |
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// Empty internal constructor, to prevent people from mistakenly deploying |
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// an instance of this contract, which should be used via inheritance. |
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constructor () internal { } |
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// solhint-disable-previous-line no-empty-blocks |
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|
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function _msgSender() internal view returns (address payable) { |
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return msg.sender; |
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} |
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|
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function _msgData() internal view returns (bytes memory) { |
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this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 |
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return msg.data; |
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} |
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} |
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// File: @openzeppelin/contracts/ownership/Ownable.sol |
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pragma solidity ^0.5.0; |
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/** |
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* @dev Contract module which provides a basic access control mechanism, where |
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* there is an account (an owner) that can be granted exclusive access to |
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* specific functions. |
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* |
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* This module is used through inheritance. It will make available the modifier |
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* `onlyOwner`, which can be applied to your functions to restrict their use to |
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* the owner. |
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*/ |
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contract Ownable is Context { |
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address private _owner; |
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|
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event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); |
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|
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/** |
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* @dev Initializes the contract setting the deployer as the initial owner. |
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*/ |
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constructor () internal { |
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address msgSender = _msgSender(); |
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_owner = msgSender; |
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emit OwnershipTransferred(address(0), msgSender); |
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} |
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|
|
/** |
|
* @dev Returns the address of the current owner. |
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*/ |
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function owner() public view returns (address) { |
|
return _owner; |
|
} |
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|
|
/** |
|
* @dev Throws if called by any account other than the owner. |
|
*/ |
|
modifier onlyOwner() { |
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require(isOwner(), "Ownable: caller is not the owner"); |
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_; |
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} |
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|
|
/** |
|
* @dev Returns true if the caller is the current owner. |
|
*/ |
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function isOwner() public view returns (bool) { |
|
return _msgSender() == _owner; |
|
} |
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|
|
/** |
|
* @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)); |
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_owner = address(0); |
|
} |
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|
|
/** |
|
* @dev Transfers ownership of the contract to a new account (`newOwner`). |
|
* Can only be called by the current owner. |
|
*/ |
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function transferOwnership(address newOwner) public onlyOwner { |
|
_transferOwnership(newOwner); |
|
} |
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|
|
/** |
|
* @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; |
|
} |
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} |
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// File: @openzeppelin/contracts/token/ERC20/IERC20.sol |
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pragma solidity ^0.5.0; |
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/** |
|
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include |
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* the optional functions; to access them see {ERC20Detailed}. |
|
*/ |
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interface IERC20 { |
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/** |
|
* @dev Returns the amount of tokens in existence. |
|
*/ |
|
function totalSupply() external view returns (uint256); |
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|
|
/** |
|
* @dev Returns the amount of tokens owned by `account`. |
|
*/ |
|
function balanceOf(address account) external view returns (uint256); |
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|
|
/** |
|
* @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); |
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|
|
/** |
|
* @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); |
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|
|
/** |
|
* @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); |
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|
|
/** |
|
* @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); |
|
} |
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|
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// File: @openzeppelin/contracts/utils/Address.sol |
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|
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pragma solidity ^0.5.5; |
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|
|
/** |
|
* @dev Collection of functions related to the address type |
|
*/ |
|
library Address { |
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/** |
|
* @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) { |
|
// 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 != accountHash && codehash != 0x0); |
|
} |
|
|
|
/** |
|
* @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"); |
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|
|
// solhint-disable-next-line avoid-call-value |
|
(bool success, ) = recipient.call.value(amount)(""); |
|
require(success, "Address: unable to send value, recipient may have reverted"); |
|
} |
|
} |
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|
|
// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol |
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|
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pragma solidity ^0.5.0; |
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|
|
|
|
|
|
|
|
/** |
|
* @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/Unipool.sol |
|
|
|
pragma solidity ^0.5.0; |
|
|
|
|
|
|
|
|
|
|
|
contract LPTokenWrapper { |
|
using SafeMath for uint256; |
|
using SafeERC20 for IERC20; |
|
// Staking token |
|
IERC20 public uniswapTokenExchange = IERC20(0x8bab80afDDb52F5B581C18324d985013Da49569a); |
|
|
|
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); |
|
uniswapTokenExchange.safeTransferFrom(msg.sender, address(this), amount); |
|
} |
|
|
|
function withdraw(uint256 amount) public { |
|
_totalSupply = _totalSupply.sub(amount); |
|
_balances[msg.sender] = _balances[msg.sender].sub(amount); |
|
uniswapTokenExchange.safeTransfer(msg.sender, amount); |
|
} |
|
} |
|
|
|
contract UniPool is LPTokenWrapper { |
|
// Reward token |
|
IERC20 public tradedToken = IERC20(0x48E1EeC032171F871890c86308147032BB246508); |
|
uint256 public constant DURATION = 30 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; |
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uint256 public totalRewardsDistributed; |
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event RewardAdded(uint256 reward); |
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event Staked(address indexed user, uint256 amount); |
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event Withdrawn(address indexed user, uint256 amount); |
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event RewardPaid(address indexed user, uint256 reward); |
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modifier updateReward(address account) { |
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rewardPerTokenStored = rewardPerToken(); |
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lastUpdateTime = lastTimeRewardApplicable(); |
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if (account != address(0)) { |
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rewards[account] = earned(account); |
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userRewardPerTokenPaid[account] = rewardPerTokenStored; |
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} |
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_; |
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} |
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constructor() public { |
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} |
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function lastTimeRewardApplicable() public view returns (uint256) { |
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return Math.min(block.timestamp, periodFinish); |
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} |
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function rewardPerToken() public view returns (uint256) { |
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if (totalSupply() == 0) { |
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return rewardPerTokenStored; |
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} |
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return |
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rewardPerTokenStored.add( |
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lastTimeRewardApplicable() |
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.sub(lastUpdateTime) |
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.mul(rewardRate) |
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.mul(1e18) |
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.div(totalSupply()) |
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); |
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} |
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function earned(address account) public view returns (uint256) { |
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return |
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balanceOf(account) |
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.mul(rewardPerToken().sub(userRewardPerTokenPaid[account])) |
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.div(1e18) |
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.add(rewards[account]); |
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} |
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// stake visibility is public as overriding LPTokenWrapper's stake() function |
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function stake(uint256 amount) public updateReward(msg.sender) { |
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require(amount > 0, "Cannot stake 0"); |
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super.stake(amount); |
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emit Staked(msg.sender, amount); |
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} |
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function withdraw(uint256 amount) public updateReward(msg.sender) { |
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require(amount > 0, "Cannot withdraw 0"); |
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super.withdraw(amount); |
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emit Withdrawn(msg.sender, amount); |
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} |
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function exit() external { |
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withdraw(balanceOf(msg.sender)); |
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getReward(); |
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} |
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function getReward() public updateReward(msg.sender) { |
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uint256 reward = earned(msg.sender); |
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if (reward > 0) { |
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rewards[msg.sender] = 0; |
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tradedToken.safeTransfer(msg.sender, reward); |
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emit RewardPaid(msg.sender, reward); |
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} |
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} |
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function notifyRewardAmount(uint256 _amount) |
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external |
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updateReward(address(0)) |
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{ |
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if (block.timestamp >= periodFinish) { |
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rewardRate = _amount.div(DURATION); |
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} else { |
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uint256 remainingTime = periodFinish.sub(block.timestamp); |
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uint256 leftoverReward = remainingTime.mul(rewardRate); |
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uint256 newRewardRate = _amount.add(leftoverReward).div(DURATION); |
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require(newRewardRate >= rewardRate, "New reward rate too low"); |
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rewardRate = newRewardRate; |
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} |
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lastUpdateTime = block.timestamp; |
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periodFinish = block.timestamp.add(DURATION); |
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tradedToken.safeTransferFrom(msg.sender, address(this), _amount); |
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totalRewardsDistributed = totalRewardsDistributed.add(_amount); |
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emit RewardAdded(_amount); |
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} |
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} |
