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AaveStrategy.sol
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AaveStrategy.sol
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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.7;
import "../BaseStrategy.sol";
library DataTypes {
struct ReserveData {
ReserveConfigurationMap configuration;
uint128 liquidityIndex;
uint128 variableBorrowIndex;
uint128 currentLiquidityRate;
uint128 currentVariableBorrowRate;
uint128 currentStableBorrowRate;
uint40 lastUpdateTimestamp;
address aTokenAddress;
address stableDebtTokenAddress;
address variableDebtTokenAddress;
address interestRateStrategyAddress;
uint8 id;
}
struct ReserveConfigurationMap {
uint256 data;
}
}
interface ILendingPool {
function deposit(
address asset,
uint256 amount,
address onBehalfOf,
uint16 referralCode
) external;
function withdraw(
address asset,
uint256 amount,
address to
) external returns (uint256);
function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);
}
interface IAaveIncentivesController {
function getRewardsBalance(address[] calldata assets, address user) external view returns (uint256);
function claimRewards(
address[] calldata assets,
uint256 amount,
address to
) external returns (uint256);
}
contract AaveStrategy is BaseStrategy {
using SafeERC20 for IERC20;
ILendingPool internal immutable aaveLendingPool;
IAaveIncentivesController internal immutable incentiveController;
IERC20 public immutable aToken;
constructor(
ILendingPool _aaveLendingPool,
IAaveIncentivesController _incentiveController,
BaseStrategy.ConstructorParams memory params
) BaseStrategy(params) {
aaveLendingPool = _aaveLendingPool;
incentiveController = _incentiveController;
aToken = IERC20(_aaveLendingPool.getReserveData(address(params.strategyToken)).aTokenAddress);
params.strategyToken.safeApprove(address(_aaveLendingPool), type(uint256).max);
}
function _skim(uint256 amount) internal override {
aaveLendingPool.deposit(address(strategyToken), amount, address(this), 0);
}
function _harvest(uint256 balance) internal override returns (int256 amountAdded) {
uint256 currentBalance = aToken.balanceOf(address(this));
amountAdded = int256(currentBalance) - int256(balance);
if (amountAdded > 0) aaveLendingPool.withdraw(address(strategyToken), uint256(amountAdded), address(this));
}
function _withdraw(uint256 amount) internal override {
aaveLendingPool.withdraw(address(strategyToken), amount, address(this));
}
function _exit() internal override {
uint256 tokenBalance = aToken.balanceOf(address(this));
uint256 available = IERC20(strategyToken).balanceOf(address(aToken));
if (tokenBalance <= available) {
/// @dev If there are more tokens available than our full position, take all based on aToken balance (continue if unsuccessful).
try aaveLendingPool.withdraw(address(strategyToken), tokenBalance, address(this)) {} catch {}
} else {
/// @dev Otherwise redeem all available and take a loss on the missing amount (continue if unsuccessful).
try aaveLendingPool.withdraw(address(strategyToken), available, address(this)) {} catch {}
}
}
function _harvestRewards() internal virtual override {
address[] memory rewardTokens = new address[](1);
rewardTokens[0] = address(aToken);
uint256 reward = incentiveController.getRewardsBalance(rewardTokens, address(this));
incentiveController.claimRewards(rewardTokens, reward, address(this));
}
}