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Merge pull request #37 from ionicprotocol/feat/iliquidator-interface
ILiquidator interface
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // SPDX-License-Identifier: UNLICENSED | ||
| pragma solidity >=0.8.0; | ||
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| import { ICErc20 } from "./compound/CTokenInterfaces.sol"; | ||
| import "./liquidators/IRedemptionStrategy.sol"; | ||
| import "./liquidators/IFundsConversionStrategy.sol"; | ||
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| interface ILiquidator { | ||
| /** | ||
| * borrower The borrower's Ethereum address. | ||
| * repayAmount The amount to repay to liquidate the unhealthy loan. | ||
| * cErc20 The borrowed CErc20 contract to repay. | ||
| * cTokenCollateral The cToken collateral contract to be liquidated. | ||
| * minProfitAmount The minimum amount of profit required for execution (in terms of `exchangeProfitTo`). Reverts if this condition is not met. | ||
| * redemptionStrategies The IRedemptionStrategy contracts to use, if any, to redeem "special" collateral tokens (before swapping the output for borrowed tokens to be repaid via Uniswap). | ||
| * strategyData The data for the chosen IRedemptionStrategy contracts, if any. | ||
| */ | ||
| struct LiquidateToTokensWithFlashSwapVars { | ||
| address borrower; | ||
| uint256 repayAmount; | ||
| ICErc20 cErc20; | ||
| ICErc20 cTokenCollateral; | ||
| address flashSwapContract; | ||
| uint256 minProfitAmount; | ||
| IRedemptionStrategy[] redemptionStrategies; | ||
| bytes[] strategyData; | ||
| IFundsConversionStrategy[] debtFundingStrategies; | ||
| bytes[] debtFundingStrategiesData; | ||
| } | ||
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| function redemptionStrategiesWhitelist(address strategy) external view returns (bool); | ||
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| function safeLiquidate( | ||
| address borrower, | ||
| uint256 repayAmount, | ||
| ICErc20 cErc20, | ||
| ICErc20 cTokenCollateral, | ||
| uint256 minOutputAmount | ||
| ) external returns (uint256); | ||
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| function safeLiquidateToTokensWithFlashLoan(LiquidateToTokensWithFlashSwapVars calldata vars) | ||
| external | ||
| returns (uint256); | ||
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| function _whitelistRedemptionStrategy(IRedemptionStrategy strategy, bool whitelisted) external; | ||
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| function _whitelistRedemptionStrategies(IRedemptionStrategy[] calldata strategies, bool[] calldata whitelisted) | ||
| external; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -8,6 +8,7 @@ import "openzeppelin-contracts-upgradeable/contracts/token/ERC20/utils/SafeERC20 | |
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| import "./liquidators/IRedemptionStrategy.sol"; | ||
| import "./liquidators/IFundsConversionStrategy.sol"; | ||
| import "./ILiquidator.sol"; | ||
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| import "./external/uniswap/IUniswapV3FlashCallback.sol"; | ||
| import "./external/uniswap/IUniswapV3Pool.sol"; | ||
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@@ -21,7 +22,7 @@ import { ICErc20 } from "./compound/CTokenInterfaces.sol"; | |
| * @author Veliko Minkov <[email protected]> (https://github.com/vminkov) | ||
| * @notice IonicUniV3Liquidator liquidates unhealthy borrowers with flashloan support. | ||
| */ | ||
| contract IonicUniV3Liquidator is OwnableUpgradeable, IUniswapV3FlashCallback { | ||
| contract IonicUniV3Liquidator is OwnableUpgradeable, ILiquidator, IUniswapV3FlashCallback { | ||
| using AddressUpgradeable for address payable; | ||
| using SafeERC20Upgradeable for IERC20Upgradeable; | ||
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@@ -99,19 +100,6 @@ contract IonicUniV3Liquidator is OwnableUpgradeable, IUniswapV3FlashCallback { | |
| return seizedOutputAmount; | ||
| } | ||
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| struct LiquidateToTokensWithFlashSwapVars { | ||
| address borrower; | ||
| uint256 repayAmount; | ||
| ICErc20 cErc20; | ||
| ICErc20 cTokenCollateral; | ||
| IUniswapV3Pool flashSwapPool; | ||
| uint256 minProfitAmount; | ||
| IRedemptionStrategy[] redemptionStrategies; | ||
| bytes[] strategyData; | ||
| IFundsConversionStrategy[] debtFundingStrategies; | ||
| bytes[] debtFundingStrategiesData; | ||
| } | ||
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| function safeLiquidateToTokensWithFlashLoan(LiquidateToTokensWithFlashSwapVars calldata vars) | ||
| external | ||
| returns (uint256) | ||
|
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@@ -143,8 +131,9 @@ contract IonicUniV3Liquidator is OwnableUpgradeable, IUniswapV3FlashCallback { | |
| _flashSwapAmount = fundingAmount; | ||
| _flashSwapToken = address(fundingToken); | ||
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| bool token0IsFlashSwapFundingToken = vars.flashSwapPool.token0() == address(fundingToken); | ||
| vars.flashSwapPool.flash( | ||
| IUniswapV3Pool flashSwapPool = IUniswapV3Pool(vars.flashSwapContract); | ||
| bool token0IsFlashSwapFundingToken = flashSwapPool.token0() == address(fundingToken); | ||
| flashSwapPool.flash( | ||
| address(this), | ||
| token0IsFlashSwapFundingToken ? fundingAmount : 0, | ||
| !token0IsFlashSwapFundingToken ? fundingAmount : 0, | ||
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@@ -352,7 +341,7 @@ contract IonicUniV3Liquidator is OwnableUpgradeable, IUniswapV3FlashCallback { | |
| uint256 underlyingCollateralSeized, | ||
| IRedemptionStrategy strategy, | ||
| bytes memory strategyData | ||
| ) public returns (IERC20Upgradeable, uint256) { | ||
| ) private returns (IERC20Upgradeable, uint256) { | ||
| require(redemptionStrategiesWhitelist[address(strategy)], "only whitelisted redemption strategies can be used"); | ||
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| bytes memory returndata = _functionDelegateCall( | ||
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@@ -367,7 +356,7 @@ contract IonicUniV3Liquidator is OwnableUpgradeable, IUniswapV3FlashCallback { | |
| uint256 inputAmount, | ||
| IFundsConversionStrategy strategy, | ||
| bytes memory strategyData | ||
| ) public returns (IERC20Upgradeable, uint256) { | ||
| ) private returns (IERC20Upgradeable, uint256) { | ||
| require(redemptionStrategiesWhitelist[address(strategy)], "only whitelisted redemption strategies can be used"); | ||
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| bytes memory returndata = _functionDelegateCall( | ||
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@@ -415,47 +404,4 @@ contract IonicUniV3Liquidator is OwnableUpgradeable, IUniswapV3FlashCallback { | |
| } | ||
| } | ||
| } | ||
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| /** | ||
| * @dev Returns an array containing the parameters supplied. | ||
| */ | ||
| function array(uint256 a) private pure returns (uint256[] memory) { | ||
| uint256[] memory arr = new uint256[](1); | ||
| arr[0] = a; | ||
| return arr; | ||
| } | ||
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| /** | ||
| * @dev Returns an array containing the parameters supplied. | ||
| */ | ||
| function array(address a) private pure returns (address[] memory) { | ||
| address[] memory arr = new address[](1); | ||
| arr[0] = a; | ||
| return arr; | ||
| } | ||
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| /** | ||
| * @dev Returns an array containing the parameters supplied. | ||
| */ | ||
| function array(address a, address b) private pure returns (address[] memory) { | ||
| address[] memory arr = new address[](2); | ||
| arr[0] = a; | ||
| arr[1] = b; | ||
| return arr; | ||
| } | ||
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| /** | ||
| * @dev Returns an array containing the parameters supplied. | ||
| */ | ||
| function array( | ||
| address a, | ||
| address b, | ||
| address c | ||
| ) private pure returns (address[] memory) { | ||
| address[] memory arr = new address[](3); | ||
| arr[0] = a; | ||
| arr[1] = b; | ||
| arr[2] = c; | ||
| return arr; | ||
| } | ||
| } | ||
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