refactor: add StrategyCurveRSVVoterProxy

contracts/strategies/StrategyCurveRSVVoterProxy.sol

@@ -0,0 +1,247 @@
+// SPDX-License-Identifier: AGPL-3.0
+
+pragma solidity ^0.5.17;
+
+import "@openzeppelinV2/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelinV2/contracts/math/SafeMath.sol";
+import "@openzeppelinV2/contracts/utils/Address.sol";
+import "@openzeppelinV2/contracts/token/ERC20/SafeERC20.sol";
+
+import "../../interfaces/yearn/IController.sol";
+import "../../interfaces/curve/Curve.sol";
+
+interface IVoterProxy {
+    function withdraw(
+        address _gauge,
+        address _token,
+        uint256 _amount
+    ) external returns (uint256);
+
+    function balanceOf(address _gauge) external view returns (uint256);
+
+    function withdrawAll(address _gauge, address _token) external returns (uint256);
+
+    function deposit(address _gauge, address _token) external;
+
+    function harvest(address _gauge) external;
+
+    function lock() external;
+
+    function claimRewards(address _gauge, address _token) external;
+
+    function approveStrategy(address _gauge, address _strategy) external;
+}
+
+contract StrategyCurveRSVVoterProxy {
+    using SafeERC20 for IERC20;
+    using Address for address;
+    using SafeMath for uint256;
+
+    address public constant want = address(0xC2Ee6b0334C261ED60C72f6054450b61B8f18E35);
+    address public constant crv = address(0xD533a949740bb3306d119CC777fa900bA034cd52);
+
+    address public constant curve = address(0xC18cC39da8b11dA8c3541C598eE022258F9744da);
+    address public constant gauge = address(0x4dC4A289a8E33600D8bD4cf5F6313E43a37adec7);
+    address public constant voter = address(0xF147b8125d2ef93FB6965Db97D6746952a133934);
+
+    address public constant rsv = address(0x196f4727526eA7FB1e17b2071B3d8eAA38486988);
+    address public constant rsr = address(0x8762db106B2c2A0bccB3A80d1Ed41273552616E8);
+
+    address public constant oneinch = address(0x111111125434b319222CdBf8C261674aDB56F3ae);
+
+    uint256 public keepCRV = 500;
+    uint256 public treasuryFee = 1000;
+    uint256 public strategistReward = 1000;
+    uint256 public withdrawalFee = 0;
+    uint256 public constant FEE_DENOMINATOR = 10000;
+
+    address public proxy;
+    address public dex;
+
+    address public governance;
+    address public controller;
+    address public strategist;
+    address public keeper;
+
+    uint256 public earned; // lifetime strategy earnings denominated in `want` token
+
+    event Harvested(uint256 wantEarned, uint256 lifetimeEarned);
+
+    constructor(address _controller) public {
+        governance = msg.sender;
+        strategist = msg.sender;
+        keeper = msg.sender;
+        controller = _controller;
+        // standardize constructor
+        proxy = address(0x9a3a03C614dc467ACC3e81275468e033c98d960E);
+    }
+
+    function getName() external pure returns (string memory) {
+        return "StrategyCurveRSVVoterProxy";
+    }
+
+    function setStrategist(address _strategist) external {
+        require(msg.sender == strategist || msg.sender == governance, "!authorized");
+        strategist = _strategist;
+    }
+
+    function setKeeper(address _keeper) external {
+        require(msg.sender == strategist || msg.sender == governance, "!authorized");
+        keeper = _keeper;
+    }
+
+    function setKeepCRV(uint256 _keepCRV) external {
+        require(msg.sender == governance, "!governance");
+        keepCRV = _keepCRV;
+    }
+
+    function setWithdrawalFee(uint256 _withdrawalFee) external {
+        require(msg.sender == governance, "!governance");
+        withdrawalFee = _withdrawalFee;
+    }
+
+    function setTreasuryFee(uint256 _treasuryFee) external {
+        require(msg.sender == governance, "!governance");
+        treasuryFee = _treasuryFee;
+    }
+
+    function setStrategistReward(uint256 _strategistReward) external {
+        require(msg.sender == governance, "!governance");
+        strategistReward = _strategistReward;
+    }
+
+    function setProxy(address _proxy) external {
+        require(msg.sender == governance, "!governance");
+        proxy = _proxy;
+    }
+
+    function deposit() public {
+        uint256 _want = IERC20(want).balanceOf(address(this));
+        if (_want > 0) {
+            IERC20(want).safeTransfer(proxy, _want);
+            IVoterProxy(proxy).deposit(gauge, want);
+        }
+    }
+
+    // Controller only function for creating additional rewards from dust
+    function withdraw(IERC20 _asset) external returns (uint256 balance) {
+        require(msg.sender == controller, "!controller");
+        require(want != address(_asset), "want");
+        require(crv != address(_asset), "crv");
+        require(rsv != address(_asset), "rsv");
+        balance = _asset.balanceOf(address(this));
+        _asset.safeTransfer(controller, balance);
+    }
+
+    // Withdraw partial funds, normally used with a vault withdrawal
+    function withdraw(uint256 _amount) external {
+        require(msg.sender == controller, "!controller");
+        uint256 _balance = IERC20(want).balanceOf(address(this));
+        if (_balance < _amount) {
+            _amount = _withdrawSome(_amount.sub(_balance));
+            _amount = _amount.add(_balance);
+        }
+
+        uint256 _fee = _amount.mul(withdrawalFee).div(FEE_DENOMINATOR);
+
+        IERC20(want).safeTransfer(IController(controller).rewards(), _fee);
+        address _vault = IController(controller).vaults(address(want));
+        require(_vault != address(0), "!vault"); // additional protection so we don't burn the funds
+        IERC20(want).safeTransfer(_vault, _amount.sub(_fee));
+    }
+
+    function _withdrawSome(uint256 _amount) internal returns (uint256) {
+        return IVoterProxy(proxy).withdraw(gauge, want, _amount);
+    }
+
+    // Withdraw all funds, normally used when migrating strategies
+    function withdrawAll() external returns (uint256 balance) {
+        require(msg.sender == controller, "!controller");
+        _withdrawAll();
+
+        balance = IERC20(want).balanceOf(address(this));
+
+        address _vault = IController(controller).vaults(address(want));
+        require(_vault != address(0), "!vault"); // additional protection so we don't burn the funds
+        IERC20(want).safeTransfer(_vault, balance);
+    }
+
+    function _withdrawAll() internal {
+        IVoterProxy(proxy).withdrawAll(gauge, want);
+    }
+
+    function swapViaOneInch(
+        address _token,
+        uint256 _amount,
+        bytes memory callData
+    ) internal {
+        IERC20(_token).approve(oneinch, _amount);
+
+        // solium-disable-next-line security/no-call-value
+        (bool success, ) = address(oneinch).call(callData);
+        if (!success) revert("1Inch-swap-failed");
+    }
+
+    function harvest(bytes memory crvCallData, bytes memory rsrCallData) public {
+        require(msg.sender == keeper || msg.sender == strategist || msg.sender == governance, "!keepers");
+
+        // harvest CRV rewards
+        IVoterProxy(proxy).harvest(gauge);
+        uint256 _crv = IERC20(crv).balanceOf(address(this));
+        if (_crv > 0) {
+            uint256 _keepCRV = _crv.mul(keepCRV).div(FEE_DENOMINATOR);
+            IERC20(crv).safeTransfer(voter, _keepCRV);
+            _crv = _crv.sub(_keepCRV);
+            swapViaOneInch(crv, _crv, crvCallData);
+        }
+
+        // harvest RSR rewards
+        IVoterProxy(proxy).claimRewards(gauge, rsr);
+        uint256 _rsr = IERC20(rsr).balanceOf(address(this));
+
+        if (_rsr > 0) {
+            swapViaOneInch(rsr, _rsr, rsrCallData);
+        }
+
+        // deposit all RSV to the Curve pool
+        uint256 _rsv = IERC20(rsv).balanceOf(address(this));
+        if (_rsv > 0) {
+            IERC20(rsv).safeApprove(curve, 0);
+            IERC20(rsv).safeApprove(curve, _rsv);
+            ICurveFi(curve).add_liquidity([_rsv, 0], 0);
+        }
+        uint256 _want = IERC20(want).balanceOf(address(this));
+        if (_want > 0) {
+            uint256 _fee = _want.mul(treasuryFee).div(FEE_DENOMINATOR);
+            uint256 _reward = _want.mul(strategistReward).div(FEE_DENOMINATOR);
+            IERC20(want).safeTransfer(IController(controller).rewards(), _fee);
+            IERC20(want).safeTransfer(strategist, _reward);
+            deposit();
+        }
+        IVoterProxy(proxy).lock();
+        earned = earned.add(_want);
+        emit Harvested(_want, earned);
+    }
+
+    function balanceOfWant() public view returns (uint256) {
+        return IERC20(want).balanceOf(address(this));
+    }
+
+    function balanceOfPool() public view returns (uint256) {
+        return IVoterProxy(proxy).balanceOf(gauge);
+    }
+
+    function balanceOf() public view returns (uint256) {
+        return balanceOfWant().add(balanceOfPool());
+    }
+
+    function setGovernance(address _governance) external {
+        require(msg.sender == governance, "!governance");
+        governance = _governance;
+    }
+
+    function setController(address _controller) external {
+        require(msg.sender == governance, "!governance");
+        controller = _controller;
+    }
+}