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Merge pull request #21 from makerdao/steCRV
SteCRV support
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Submodule dss-crop-join
added at
546fcb
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| Original file line number | Diff line number | Diff line change |
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| // SPDX-License-Identifier: AGPL-3.0-or-later | ||
| // Copyright (C) 2022 Dai Foundation | ||
| // | ||
| // This program is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Affero General Public License as published | ||
| // by the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Affero General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Affero General Public License | ||
| // along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
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| pragma solidity 0.6.12; | ||
| pragma experimental ABIEncoderV2; | ||
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| interface GemJoinLike { | ||
| function dec() external view returns (uint256); | ||
| function gem() external view returns (address); | ||
| function exit(address, uint256) external; | ||
| } | ||
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| interface DaiJoinLike { | ||
| function dai() external view returns (TokenLike); | ||
| function join(address, uint256) external; | ||
| } | ||
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| interface TokenLike { | ||
| function approve(address, uint256) external; | ||
| function transfer(address, uint256) external; | ||
| function balanceOf(address) external view returns (uint256); | ||
| function symbol() external view returns (string memory); | ||
| } | ||
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| interface ManagerLike { | ||
| function exit(address crop, address usr, uint256 val) external; | ||
| } | ||
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| interface CurvePoolLike { | ||
| function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 _min_amount) | ||
| external returns (uint256); | ||
| function coins(uint256) external view returns (address); | ||
| } | ||
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| interface WethLike is TokenLike { | ||
| function deposit() external payable; | ||
| } | ||
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| interface UniV3RouterLike { | ||
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| struct ExactInputParams { | ||
| bytes path; | ||
| address recipient; | ||
| uint256 deadline; | ||
| uint256 amountIn; | ||
| uint256 amountOutMinimum; | ||
| } | ||
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| function exactInput(UniV3RouterLike.ExactInputParams calldata params) | ||
| external payable returns (uint256 amountOut); | ||
| } | ||
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| contract CurveLpTokenUniv3Callee { | ||
| UniV3RouterLike public immutable uniV3Router; | ||
| DaiJoinLike public immutable daiJoin; | ||
| TokenLike public immutable dai; | ||
| address public immutable weth; | ||
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| uint256 public constant RAY = 10 ** 27; | ||
| address public constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; | ||
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| function _add(uint x, uint y) internal pure returns (uint z) { | ||
| require((z = x + y) >= x, "ds-math-add-overflow"); | ||
| } | ||
| function _sub(uint x, uint y) internal pure returns (uint z) { | ||
| require((z = x - y) <= x, "ds-math-sub-underflow"); | ||
| } | ||
| function _divup(uint256 x, uint256 y) internal pure returns (uint256 z) { | ||
| z = _add(x, _sub(y, 1)) / y; | ||
| } | ||
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| struct CurveData { | ||
| address pool; | ||
| uint256 coinIndex; | ||
| } | ||
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| constructor( | ||
| address uniV3Router_, | ||
| address daiJoin_, | ||
| address weth_ | ||
| ) public { | ||
| uniV3Router = UniV3RouterLike(uniV3Router_); | ||
| daiJoin = DaiJoinLike(daiJoin_); | ||
| TokenLike dai_ = DaiJoinLike(daiJoin_).dai(); | ||
| dai = dai_; | ||
| weth = weth_; | ||
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| dai_.approve(daiJoin_, type(uint256).max); | ||
| } | ||
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| receive() external payable {} | ||
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| function _fromWad(address gemJoin, uint256 wad) internal view returns (uint256 amt) { | ||
| amt = wad / 10 ** (_sub(18, GemJoinLike(gemJoin).dec())); | ||
| } | ||
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| function clipperCall( | ||
| address sender, // Clipper caller, pays back the loan | ||
| uint256 owe, // Dai amount to pay back [rad] | ||
| uint256 slice, // Gem amount received [wad] | ||
| bytes calldata data // Extra data, see below | ||
| ) external { | ||
| ( | ||
| address to, // address to send remaining DAI to | ||
| address gemJoin, // gemJoin adapter address | ||
| uint256 minProfit, // minimum profit in DAI to make [wad] | ||
| bytes memory path, // uniswap v3 path | ||
| address manager, // pass address(0) if no manager | ||
| CurveData memory curveData // curve pool data | ||
| ) = abi.decode(data, (address, address, uint256, bytes, address, CurveData)); | ||
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| address gem = GemJoinLike(gemJoin).gem(); | ||
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| // Convert slice to token precision | ||
| slice = _fromWad(gemJoin, slice); | ||
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| // Exit gem to token | ||
| if(manager != address(0)) { | ||
| ManagerLike(manager).exit(gemJoin, address(this), slice); | ||
| } else { | ||
| GemJoinLike(gemJoin).exit(address(this), slice); | ||
| } | ||
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| // curveData used explicitly to avoid stack too deep | ||
| TokenLike(gem).approve(curveData.pool, slice); | ||
| slice = CurvePoolLike(curveData.pool).remove_liquidity_one_coin({ | ||
| _token_amount: slice, | ||
| i: int128(curveData.coinIndex), | ||
| _min_amount: 0 // minProfit is checked below | ||
| }); | ||
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| gem = CurvePoolLike(curveData.pool).coins(curveData.coinIndex); | ||
| if (gem == ETH) { | ||
| gem = weth; | ||
| WethLike(gem).deposit{ | ||
| value: slice | ||
| }(); | ||
| } | ||
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| // Approve uniV3 to take gem | ||
| TokenLike(gem).approve(address(uniV3Router), slice); | ||
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| // Calculate amount of DAI to Join (as erc20 WAD value) | ||
| uint256 daiToJoin = _divup(owe, RAY); | ||
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| UniV3RouterLike.ExactInputParams memory params = UniV3RouterLike.ExactInputParams({ | ||
| path: path, | ||
| recipient: address(this), | ||
| deadline: block.timestamp, | ||
| amountIn: slice, | ||
| amountOutMinimum: _add(daiToJoin, minProfit) | ||
| }); | ||
| uniV3Router.exactInput(params); | ||
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| // Although Uniswap will accept all gems, this check is a sanity check, just in case | ||
| // Transfer any lingering gem to specified address | ||
| if (TokenLike(gem).balanceOf(address(this)) > 0) { | ||
| TokenLike(gem).transfer(to, TokenLike(gem).balanceOf(address(this))); | ||
| } | ||
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| // Convert DAI bought to internal vat value of the msg.sender of Clipper.take | ||
| daiJoin.join(sender, daiToJoin); | ||
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| // Transfer remaining DAI to specified address | ||
| dai.transfer(to, dai.balanceOf(address(this))); | ||
| } | ||
| } |
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