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Merge pull request #25 from mubaris/aave-v2

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Aave v2 connector
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Thrilok kumar 2020-12-03 23:59:07 +05:30 committed by GitHub
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2 changed files with 297 additions and 37 deletions
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230
contracts/connectors/aave_v2.sol Normal file
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@ -0,0 +1,230 @@
pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
// import files from common directory
import { TokenInterface , MemoryInterface, EventInterface} from "../common/interfaces.sol";
import { Stores } from "../common/stores.sol";
import { DSMath } from "../common/math.sol";
interface AaveInterface {
function deposit(address _asset, uint256 _amount, address _onBehalfOf, uint16 _referralCode) external;
function withdraw(address _asset, uint256 _amount, address _to) external;
function borrow(
address _asset,
uint256 _amount,
uint256 _interestRateMode,
uint16 _referralCode,
address _onBehalfOf
) external;
function repay(address _asset, uint256 _amount, uint256 _rateMode, address _onBehalfOf) external;
function setUserUseReserveAsCollateral(address _asset, bool _useAsCollateral) external;
function getUserAccountData(address user) external view returns (
uint256 totalCollateralETH,
uint256 totalDebtETH,
uint256 availableBorrowsETH,
uint256 currentLiquidationThreshold,
uint256 ltv,
uint256 healthFactor
);
}
interface AaveLendingPoolProviderInterface {
function getLendingPool() external view returns (address);
}
// Aave Protocol Data Provider
interface AaveDataProviderInterface {
function getReserveTokensAddresses(address _asset) external view returns (
address aTokenAddress,
address stableDebtTokenAddress,
address variableDebtTokenAddress
);
function getUserReserveData(address _asset, address _user) external view returns (
uint256 currentATokenBalance,
uint256 currentStableDebt,
uint256 currentVariableDebt,
uint256 principalStableDebt,
uint256 scaledVariableDebt,
uint256 stableBorrowRate,
uint256 liquidityRate,
uint40 stableRateLastUpdated,
bool usageAsCollateralEnabled
);
}
interface AaveAddressProviderRegistryInterface {
function getAddressesProvidersList() external view returns (address[] memory);
}
interface ATokenInterface {
function scaledBalanceOf(address _user) external view returns (uint256);
function isTransferAllowed(address _user, uint256 _amount) external view returns (bool);
function balanceOf(address _user) external view returns(uint256);
}
contract AaveHelpers is DSMath, Stores {
/**
* @dev get Aave Lending Pool Provider
*/
function getAaveProvider() internal pure returns (AaveLendingPoolProviderInterface) {
// return AaveLendingPoolProviderInterface(0x24a42fD28C976A61Df5D00D0599C34c4f90748c8); //mainnet
return AaveLendingPoolProviderInterface(0x652B2937Efd0B5beA1c8d54293FC1289672AFC6b); //kovan
}
/**
* @dev get Aave Protocol Data Provider
*/
function getAaveDataProvider() internal pure returns (AaveDataProviderInterface) {
// return AaveProtocolDataProviderInterface(0x24a42fD28C976A61Df5D00D0599C34c4f90748c8); //mainnet
return AaveDataProviderInterface(0x744C1aaA95232EeF8A9994C4E0b3a89659D9AB79); //kovan
}
/**
* @dev Return Weth address
*/
function getWethAddr() internal pure returns (address) {
return 0xd0A1E359811322d97991E03f863a0C30C2cF029C; // Kovan WETH Address
}
/**
* @dev get Referral Code
*/
function getReferralCode() internal pure returns (uint16) {
return 0;
}
function getIsColl(AaveDataProviderInterface aaveData, address token, address user) internal view returns (bool isCol) {
(, , , , , , , , isCol) = aaveData.getUserReserveData(token, user);
}
function convertEthToWeth(bool isEth, TokenInterface token, uint amount) internal {
if(isEth) token.deposit.value(amount)();
}
function convertWethToEth(bool isEth, TokenInterface token, uint amount) internal {
if(isEth) {
token.approve(address(token), amount);
token.withdraw(amount);
}
}
function getPaybackBalance(AaveDataProviderInterface aaveData, address token, uint rateMode) internal view returns (uint) {
(, uint stableDebt, uint variableDebt, , , , , , ) = aaveData.getUserReserveData(token, address(this));
return rateMode == 1 ? stableDebt : variableDebt;
}
}
contract BasicResolver is AaveHelpers {
event LogDeposit(address indexed token, uint256 tokenAmt, uint256 getId, uint256 setId);
event LogWithdraw(address indexed token, uint256 tokenAmt, uint256 getId, uint256 setId);
event LogBorrow(address indexed token, uint256 tokenAmt, uint256 indexed rateMode, uint256 getId, uint256 setId);
event LogPayback(address indexed token, uint256 tokenAmt, uint256 indexed rateMode, uint256 getId, uint256 setId);
function deposit(address token, uint amt, uint getId, uint setId) external payable {
uint _amt = getUint(getId, amt);
AaveInterface aave = AaveInterface(getAaveProvider().getLendingPool());
AaveDataProviderInterface aaveData = getAaveDataProvider();
bool isEth = token == getEthAddr();
address _token = isEth ? getWethAddr() : token;
TokenInterface tokenContract = TokenInterface(_token);
if (isEth) {
_amt = _amt == uint(-1) ? address(this).balance : _amt;
convertEthToWeth(isEth, tokenContract, _amt);
} else {
_amt = _amt == uint(-1) ? tokenContract.balanceOf(address(this)) : _amt;
}
tokenContract.approve(address(aave), _amt);
aave.deposit(_token, _amt, address(this), getReferralCode());
if (!getIsColl(aaveData, _token, address(this))) {
aave.setUserUseReserveAsCollateral(_token, true);
}
setUint(setId, _amt);
emit LogDeposit(token, _amt, getId, setId);
// bytes32 _eventCode = keccak256("LogDeposit(address,uint256,uint256,uint256)");
// bytes memory _eventParam = abi.encode(token, _amt, getId, setId);
// emitEvent(_eventCode, _eventParam);
}
function withdraw(address token, uint amt, uint getId, uint setId) external {
uint _amt = getUint(getId, amt);
AaveInterface aave = AaveInterface(getAaveProvider().getLendingPool());
bool isEth = token == getEthAddr();
address _token = isEth ? getWethAddr() : token;
TokenInterface tokenContract = TokenInterface(_token);
uint initialBal = tokenContract.balanceOf(address(this));
aave.withdraw(_token, _amt, address(this));
uint finalBal = tokenContract.balanceOf(address(this));
convertWethToEth(isEth, tokenContract, finalBal);
_amt = sub(finalBal, initialBal);
setUint(setId, _amt);
emit LogWithdraw(token, _amt, getId, setId);
// bytes32 _eventCode = keccak256("LogWithdraw(address,uint256,uint256,uint256)");
// bytes memory _eventParam = abi.encode(token, _amt, getId, setId);
// emitEvent(_eventCode, _eventParam);
}
function borrow(address token, uint amt, uint rateMode, uint getId, uint setId) external {
uint _amt = getUint(getId, amt);
AaveInterface aave = AaveInterface(getAaveProvider().getLendingPool());
bool isEth = token == getEthAddr();
address _token = isEth ? getWethAddr() : token;
aave.borrow(_token, _amt, rateMode, getReferralCode(), address(this));
convertWethToEth(isEth, TokenInterface(_token), _amt);
setUint(setId, _amt);
emit LogBorrow(token, _amt, rateMode, getId, setId);
// bytes32 _eventCode = keccak256("LogBorrow(address,uint256,uint256,uint256,uint256)");
// bytes memory _eventParam = abi.encode(token, _amt, rateMode, getId, setId);
// emitEvent(_eventCode, _eventParam);
}
function payback(address token, uint amt, uint rateMode, uint getId, uint setId) external payable {
uint _amt = getUint(getId, amt);
AaveInterface aave = AaveInterface(getAaveProvider().getLendingPool());
AaveDataProviderInterface aaveData = getAaveDataProvider();
bool isEth = token == getEthAddr();
address _token = isEth ? getWethAddr() : token;
TokenInterface tokenContract = TokenInterface(_token);
_amt = _amt == uint(-1) ? getPaybackBalance(aaveData, _token, rateMode) : _amt;
if (isEth) convertEthToWeth(isEth, tokenContract, _amt);
tokenContract.approve(address(aave), _amt);
aave.repay(_token, _amt, rateMode, address(this));
setUint(setId, _amt);
emit LogPayback(token, _amt, rateMode, getId, setId);
// bytes32 _eventCode = keccak256("LogPayback(address,uint256,uint256,uint256,uint256)");
// bytes memory _eventParam = abi.encode(token, _amt, rateMode, getId, setId);
// emitEvent(_eventCode, _eventParam);
}
}
contract ConnectAaveV2 is BasicResolver {
string public name = "Aave-v2";
}

104
package-lock.json generated
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