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handled borrowing with flash loan fee

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This commit is contained in:
Chinmay Chougaonkar 2022-02-28 14:34:52 +05:30
parent 7fd95fc81e
commit df59342790
1 changed files with 16 additions and 8 deletions
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24
contracts/mainnet/connectors/compound-import/main.sol
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@ -60,14 +60,16 @@ contract CompoundHelper is Helpers, Events {
* @dev actually borrow some extra amount than the original position to cover the flash loan fee * @dev actually borrow some extra amount than the original position to cover the flash loan fee
* @param _cTokenContracts array containing all interfaces to the cToken contracts in which the user has debt positions * @param _cTokenContracts array containing all interfaces to the cToken contracts in which the user has debt positions
* @param _amts array containing the amounts the user had borrowed originally from Compound plus the flash loan fee * @param _amts array containing the amounts the user had borrowed originally from Compound plus the flash loan fee
* @param _flashLoanFee flash loan fee (in percentage and scaled up to 10**2)
*/ */
function _borrowDebtPosition( function _borrowDebtPosition(
CTokenInterface[] memory _cTokenContracts, CTokenInterface[] memory _cTokenContracts,
uint[] memory _amts uint256[] memory _amts,
uint256 _flashLoanFee
) internal { ) internal {
for (uint i = 0; i < _cTokenContracts.length; i++) { for (uint i = 0; i < _cTokenContracts.length; i++) {
if (_amts[i] > 0) { if (_amts[i] > 0) {
require(_cTokenContracts[i].borrow(_amts[i]) == 0, "borrow-failed-collateral?"); require(_cTokenContracts[i].borrow(add(_amts[i], mul(_amts[i], mul(_flashLoanFee, 10**14)))) == 0, "borrow-failed-collateral?");
} }
} }
} }
@ -192,9 +194,11 @@ contract CompoundImport is CompoundResolver {
* @notice this function performs the import of user's Compound positions into its DSA * @notice this function performs the import of user's Compound positions into its DSA
* @dev called internally by the importCompound and migrateCompound functions * @dev called internally by the importCompound and migrateCompound functions
* @param _importInputData the struct containing borrowIds of the users borrowed tokens * @param _importInputData the struct containing borrowIds of the users borrowed tokens
* @param _flashLoanFee flash loan fee
*/ */
function _importCompound( function _importCompound(
ImportInputData memory _importInputData ImportInputData memory _importInputData,
uint256 _flashLoanFee
) internal returns (string memory _eventName, bytes memory _eventParam) { ) internal returns (string memory _eventName, bytes memory _eventParam) {
require(AccountInterface(address(this)).isAuth(_importInputData.userAccount), "user-account-not-auth"); require(AccountInterface(address(this)).isAuth(_importInputData.userAccount), "user-account-not-auth");
@ -220,7 +224,7 @@ contract CompoundImport is CompoundResolver {
_transferTokensToDsa(_importInputData.userAccount, data.supplyCtokens, data.supplyAmts); _transferTokensToDsa(_importInputData.userAccount, data.supplyCtokens, data.supplyAmts);
// borrow the earlier position from Compound with flash loan fee added // borrow the earlier position from Compound with flash loan fee added
_borrowDebtPosition(data.borrowCtokens, data.borrowAmts); _borrowDebtPosition(data.borrowCtokens, data.borrowAmts, _flashLoanFee);
_eventName = "LogCompoundImport(address,address[],string[],string[],uint256[],uint256[])"; _eventName = "LogCompoundImport(address,address[],string[],string[],uint256[],uint256[])";
_eventParam = abi.encode( _eventParam = abi.encode(
@ -239,11 +243,13 @@ contract CompoundImport is CompoundResolver {
* @param _userAccount address of user whose position is to be imported to DSA * @param _userAccount address of user whose position is to be imported to DSA
* @param _supplyIds Ids of all tokens the user has supplied to Compound * @param _supplyIds Ids of all tokens the user has supplied to Compound
* @param _borrowIds Ids of all token borrowed by the user * @param _borrowIds Ids of all token borrowed by the user
* @param _flashLoanFee flash loan fee (in percentage and scaled up to 10**2)
*/ */
function importCompound( function importCompound(
address _userAccount, address _userAccount,
string[] memory _supplyIds, string[] memory _supplyIds,
string[] memory _borrowIds string[] memory _borrowIds,
uint256 _flashLoanFee
) external payable returns (string memory _eventName, bytes memory _eventParam) { ) external payable returns (string memory _eventName, bytes memory _eventParam) {
ImportInputData memory inputData = ImportInputData({ ImportInputData memory inputData = ImportInputData({
userAccount: _userAccount, userAccount: _userAccount,
@ -251,7 +257,7 @@ contract CompoundImport is CompoundResolver {
borrowIds: _borrowIds borrowIds: _borrowIds
}); });
(_eventName, _eventParam) = _importCompound(inputData); (_eventName, _eventParam) = _importCompound(inputData, _flashLoanFee);
} }
/** /**
@ -259,10 +265,12 @@ contract CompoundImport is CompoundResolver {
* @dev internally calls _importContract to perform the actual import * @dev internally calls _importContract to perform the actual import
* @param _supplyIds Ids of all tokens the user has supplied to Compound * @param _supplyIds Ids of all tokens the user has supplied to Compound
* @param _borrowIds Ids of all token borrowed by the user * @param _borrowIds Ids of all token borrowed by the user
* @param _flashLoanFee flash loan fee (in percentage and scaled up to 10**2)
*/ */
function migrateCompound( function migrateCompound(
string[] memory _supplyIds, string[] memory _supplyIds,
string[] memory _borrowIds string[] memory _borrowIds,
uint256 _flashLoanFee
) external payable returns (string memory _eventName, bytes memory _eventParam) { ) external payable returns (string memory _eventName, bytes memory _eventParam) {
ImportInputData memory inputData = ImportInputData({ ImportInputData memory inputData = ImportInputData({
userAccount: msg.sender, userAccount: msg.sender,
@ -270,7 +278,7 @@ contract CompoundImport is CompoundResolver {
borrowIds: _borrowIds borrowIds: _borrowIds
}); });
(_eventName, _eventParam) = _importCompound(inputData); (_eventName, _eventParam) = _importCompound(inputData, _flashLoanFee);
} }
} }