mirror of
https://github.com/Instadapp/aave-protocol-v2.git
synced 2024-07-29 21:47:30 +00:00
1033 lines
33 KiB
Solidity
1033 lines
33 KiB
Solidity
// SPDX-License-Identifier: agpl-3.0
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pragma solidity ^0.6.8;
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pragma experimental ABIEncoderV2;
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import {SafeMath} from '@openzeppelin/contracts/math/SafeMath.sol';
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import {IERC20} from '@openzeppelin/contracts/token/ERC20/IERC20.sol';
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import {
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VersionedInitializable
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} from '../libraries/openzeppelin-upgradeability/VersionedInitializable.sol';
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import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol';
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import {IAToken} from '../tokenization/interfaces/IAToken.sol';
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import {Helpers} from '../libraries/helpers/Helpers.sol';
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import {Errors} from '../libraries/helpers/Errors.sol';
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import {WadRayMath} from '../libraries/math/WadRayMath.sol';
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import {PercentageMath} from '../libraries/math/PercentageMath.sol';
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import {ReserveLogic} from '../libraries/logic/ReserveLogic.sol';
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import {GenericLogic} from '../libraries/logic/GenericLogic.sol';
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import {ValidationLogic} from '../libraries/logic/ValidationLogic.sol';
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import {ReserveConfiguration} from '../libraries/configuration/ReserveConfiguration.sol';
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import {UserConfiguration} from '../libraries/configuration/UserConfiguration.sol';
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import {IStableDebtToken} from '../tokenization/interfaces/IStableDebtToken.sol';
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import {IVariableDebtToken} from '../tokenization/interfaces/IVariableDebtToken.sol';
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import {DebtTokenBase} from '../tokenization/base/DebtTokenBase.sol';
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import {IFlashLoanReceiver} from '../flashloan/interfaces/IFlashLoanReceiver.sol';
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import {ISwapAdapter} from '../interfaces/ISwapAdapter.sol';
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import {LendingPoolCollateralManager} from './LendingPoolCollateralManager.sol';
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import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol';
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import {SafeERC20} from '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';
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import {ILendingPool} from '../interfaces/ILendingPool.sol';
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import {LendingPoolStorage} from './LendingPoolStorage.sol';
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import {IReserveInterestRateStrategy} from '../interfaces/IReserveInterestRateStrategy.sol';
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/**
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* @title LendingPool contract
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* @notice Implements the actions of the LendingPool, and exposes accessory methods to fetch the users and reserve data
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* @author Aave
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**/
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contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage {
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using SafeMath for uint256;
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using WadRayMath for uint256;
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using PercentageMath for uint256;
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using SafeERC20 for IERC20;
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//main configuration parameters
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uint256 public constant REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD = 4000;
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uint256 public constant REBALANCE_UP_USAGE_RATIO_THRESHOLD = 0.95 * 1e27; //usage ratio of 95%
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uint256 public constant MAX_STABLE_RATE_BORROW_SIZE_PERCENT = 2500;
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uint256 public constant FLASHLOAN_PREMIUM_TOTAL = 9;
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uint256 public constant MAX_NUMBER_RESERVES = 128;
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uint256 public constant LENDINGPOOL_REVISION = 0x2;
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/**
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* @dev only lending pools configurator can use functions affected by this modifier
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**/
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function _onlyLendingPoolConfigurator() internal view {
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require(
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_addressesProvider.getLendingPoolConfigurator() == msg.sender,
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Errors.CALLER_NOT_LENDING_POOL_CONFIGURATOR
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);
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}
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/**
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* @dev Function to make a function callable only when the contract is not paused.
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*
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* Requirements:
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*
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* - The contract must not be paused.
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*/
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function _whenNotPaused() internal view {
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require(!_paused, Errors.IS_PAUSED);
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}
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function getRevision() internal override pure returns (uint256) {
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return LENDINGPOOL_REVISION;
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}
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/**
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* @dev this function is invoked by the proxy contract when the LendingPool contract is added to the
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* AddressesProvider.
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* @param provider the address of the LendingPoolAddressesProvider registry
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**/
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function initialize(ILendingPoolAddressesProvider provider) public initializer {
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_addressesProvider = provider;
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}
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/**
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* @dev deposits The underlying asset into the reserve. A corresponding amount of the overlying asset (aTokens)
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* is minted.
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* @param asset the address of the reserve
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* @param amount the amount to be deposited
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* @param referralCode integrators are assigned a referral code and can potentially receive rewards.
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**/
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function deposit(
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address asset,
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uint256 amount,
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address onBehalfOf,
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uint16 referralCode
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) external override {
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_whenNotPaused();
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ReserveLogic.ReserveData storage reserve = _reserves[asset];
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ValidationLogic.validateDeposit(reserve, amount);
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address aToken = reserve.aTokenAddress;
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reserve.updateState();
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reserve.updateInterestRates(asset, aToken, amount, 0);
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bool isFirstDeposit = IAToken(aToken).balanceOf(onBehalfOf) == 0;
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if (isFirstDeposit) {
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_usersConfig[onBehalfOf].setUsingAsCollateral(reserve.id, true);
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}
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IAToken(aToken).mint(onBehalfOf, amount, reserve.liquidityIndex);
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//transfer to the aToken contract
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IERC20(asset).safeTransferFrom(msg.sender, aToken, amount);
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emit Deposit(asset, msg.sender, onBehalfOf, amount, referralCode);
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}
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/**
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* @dev withdraws the _reserves of user.
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* @param asset the address of the reserve
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* @param amount the underlying amount to be redeemed
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**/
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function withdraw(address asset, uint256 amount) external override {
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_whenNotPaused();
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ReserveLogic.ReserveData storage reserve = _reserves[asset];
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address aToken = reserve.aTokenAddress;
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uint256 userBalance = IAToken(aToken).balanceOf(msg.sender);
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uint256 amountToWithdraw = amount;
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//if amount is equal to uint(-1), the user wants to redeem everything
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if (amount == type(uint256).max) {
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amountToWithdraw = userBalance;
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}
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ValidationLogic.validateWithdraw(
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asset,
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amountToWithdraw,
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userBalance,
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_reserves,
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_usersConfig[msg.sender],
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_reservesList,
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_addressesProvider.getPriceOracle()
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);
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reserve.updateState();
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reserve.updateInterestRates(asset, aToken, 0, amountToWithdraw);
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if (amountToWithdraw == userBalance) {
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_usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
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}
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IAToken(aToken).burn(msg.sender, msg.sender, amountToWithdraw, reserve.liquidityIndex);
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emit Withdraw(asset, msg.sender, amount);
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}
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/**
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* @dev returns the borrow allowance of the user
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* @param asset The underlying asset of the debt token
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* @param fromUser The user to giving allowance
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* @param toUser The user to give allowance to
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* @param interestRateMode Type of debt: 1 for stable, 2 for variable
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* @return the current allowance of toUser
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**/
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function getBorrowAllowance(
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address fromUser,
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address toUser,
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address asset,
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uint256 interestRateMode
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) external override view returns (uint256) {
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return
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_borrowAllowance[_reserves[asset].getDebtTokenAddress(interestRateMode)][fromUser][toUser];
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}
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/**
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* @dev Sets allowance to borrow on a certain type of debt asset for a certain user address
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* @param asset The underlying asset of the debt token
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* @param user The user to give allowance to
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* @param interestRateMode Type of debt: 1 for stable, 2 for variable
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* @param amount Allowance amount to borrow
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**/
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function delegateBorrowAllowance(
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address asset,
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address user,
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uint256 interestRateMode,
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uint256 amount
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) external override {
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_whenNotPaused();
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address debtToken = _reserves[asset].getDebtTokenAddress(interestRateMode);
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_borrowAllowance[debtToken][msg.sender][user] = amount;
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emit BorrowAllowanceDelegated(asset, msg.sender, user, interestRateMode, amount);
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}
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/**
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* @dev Allows users to borrow a specific amount of the reserve currency, provided that the borrower
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* already deposited enough collateral.
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* @param asset the address of the reserve
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* @param amount the amount to be borrowed
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* @param interestRateMode the interest rate mode at which the user wants to borrow. Can be 0 (STABLE) or 1 (VARIABLE)
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* @param referralCode a referral code for integrators
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* @param onBehalfOf address of the user who will receive the debt
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**/
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function borrow(
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address asset,
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uint256 amount,
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uint256 interestRateMode,
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uint16 referralCode,
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address onBehalfOf
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) external override {
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_whenNotPaused();
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ReserveLogic.ReserveData storage reserve = _reserves[asset];
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if (onBehalfOf != msg.sender) {
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address debtToken = reserve.getDebtTokenAddress(interestRateMode);
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_borrowAllowance[debtToken][onBehalfOf][msg
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.sender] = _borrowAllowance[debtToken][onBehalfOf][msg.sender].sub(
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amount,
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Errors.BORROW_ALLOWANCE_ARE_NOT_ENOUGH
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);
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}
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_executeBorrow(
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ExecuteBorrowParams(
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asset,
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msg.sender,
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onBehalfOf,
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amount,
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interestRateMode,
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reserve.aTokenAddress,
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referralCode,
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true
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)
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);
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}
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/**
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* @notice repays a borrow on the specific reserve, for the specified amount (or for the whole amount, if uint256(-1) is specified).
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* @dev the target user is defined by onBehalfOf. If there is no repayment on behalf of another account,
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* onBehalfOf must be equal to msg.sender.
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* @param asset the address of the reserve on which the user borrowed
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* @param amount the amount to repay, or uint256(-1) if the user wants to repay everything
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* @param onBehalfOf the address for which msg.sender is repaying.
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**/
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function repay(
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address asset,
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uint256 amount,
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uint256 rateMode,
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address onBehalfOf
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) external override {
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_whenNotPaused();
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ReserveLogic.ReserveData storage reserve = _reserves[asset];
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(uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(onBehalfOf, reserve);
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ReserveLogic.InterestRateMode interestRateMode = ReserveLogic.InterestRateMode(rateMode);
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//default to max amount
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uint256 paybackAmount = interestRateMode == ReserveLogic.InterestRateMode.STABLE
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? stableDebt
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: variableDebt;
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if (amount != type(uint256).max && amount < paybackAmount) {
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paybackAmount = amount;
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}
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ValidationLogic.validateRepay(
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reserve,
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amount,
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interestRateMode,
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onBehalfOf,
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stableDebt,
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variableDebt
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);
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reserve.updateState();
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//burns an equivalent amount of debt tokens
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if (interestRateMode == ReserveLogic.InterestRateMode.STABLE) {
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IStableDebtToken(reserve.stableDebtTokenAddress).burn(onBehalfOf, paybackAmount);
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} else {
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IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
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onBehalfOf,
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paybackAmount,
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reserve.variableBorrowIndex
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);
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}
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address aToken = reserve.aTokenAddress;
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reserve.updateInterestRates(asset, aToken, paybackAmount, 0);
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if (stableDebt.add(variableDebt).sub(paybackAmount) == 0) {
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_usersConfig[onBehalfOf].setBorrowing(reserve.id, false);
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}
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IERC20(asset).safeTransferFrom(msg.sender, aToken, paybackAmount);
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emit Repay(asset, onBehalfOf, msg.sender, paybackAmount);
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}
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/**
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* @dev borrowers can user this function to swap between stable and variable borrow rate modes.
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* @param asset the address of the reserve on which the user borrowed
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* @param rateMode the rate mode that the user wants to swap
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**/
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function swapBorrowRateMode(address asset, uint256 rateMode) external override {
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_whenNotPaused();
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ReserveLogic.ReserveData storage reserve = _reserves[asset];
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(uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(msg.sender, reserve);
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ReserveLogic.InterestRateMode interestRateMode = ReserveLogic.InterestRateMode(rateMode);
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ValidationLogic.validateSwapRateMode(
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reserve,
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_usersConfig[msg.sender],
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stableDebt,
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variableDebt,
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interestRateMode
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);
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reserve.updateState();
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if (interestRateMode == ReserveLogic.InterestRateMode.STABLE) {
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//burn stable rate tokens, mint variable rate tokens
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IStableDebtToken(reserve.stableDebtTokenAddress).burn(msg.sender, stableDebt);
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IVariableDebtToken(reserve.variableDebtTokenAddress).mint(
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msg.sender,
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stableDebt,
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reserve.variableBorrowIndex
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);
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} else {
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//do the opposite
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IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
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msg.sender,
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variableDebt,
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reserve.variableBorrowIndex
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);
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IStableDebtToken(reserve.stableDebtTokenAddress).mint(
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msg.sender,
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variableDebt,
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reserve.currentStableBorrowRate
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);
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}
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reserve.updateInterestRates(asset, reserve.aTokenAddress, 0, 0);
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emit Swap(asset, msg.sender);
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}
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/**
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* @dev rebalances the stable interest rate of a user if current liquidity rate > user stable rate.
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* this is regulated by Aave to ensure that the protocol is not abused, and the user is paying a fair
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* rate. Anyone can call this function.
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* @param asset the address of the reserve
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* @param user the address of the user to be rebalanced
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**/
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function rebalanceStableBorrowRate(address asset, address user) external override {
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_whenNotPaused();
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ReserveLogic.ReserveData storage reserve = _reserves[asset];
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IERC20 stableDebtToken = IERC20(reserve.stableDebtTokenAddress);
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IERC20 variableDebtToken = IERC20(reserve.variableDebtTokenAddress);
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address aTokenAddress = reserve.aTokenAddress;
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uint256 stableBorrowBalance = IERC20(stableDebtToken).balanceOf(user);
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//if the utilization rate is below 95%, no rebalances are needed
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uint256 totalBorrows = stableDebtToken.totalSupply().add(variableDebtToken.totalSupply()).wadToRay();
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uint256 availableLiquidity = IERC20(asset).balanceOf(aTokenAddress).wadToRay();
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uint256 usageRatio = totalBorrows == 0
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? 0
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: totalBorrows.rayDiv(availableLiquidity.add(totalBorrows));
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//if the liquidity rate is below REBALANCE_UP_THRESHOLD of the max variable APR at 95% usage,
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//then we allow rebalancing of the stable rate positions.
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uint256 currentLiquidityRate = reserve.currentLiquidityRate;
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uint256 maxVariableBorrowRate = IReserveInterestRateStrategy(
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reserve
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.interestRateStrategyAddress
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)
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.getMaxVariableBorrowRate();
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require(
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usageRatio >= REBALANCE_UP_USAGE_RATIO_THRESHOLD &&
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currentLiquidityRate <=
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maxVariableBorrowRate.percentMul(REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD),
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Errors.INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET
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);
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reserve.updateState();
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IStableDebtToken(address(stableDebtToken)).burn(user, stableBorrowBalance);
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IStableDebtToken(address(stableDebtToken)).mint(user, stableBorrowBalance, reserve.currentStableBorrowRate);
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reserve.updateInterestRates(asset, aTokenAddress, 0, 0);
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emit RebalanceStableBorrowRate(asset, user);
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}
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/**
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* @dev allows depositors to enable or disable a specific deposit as collateral.
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* @param asset the address of the reserve
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* @param useAsCollateral true if the user wants to user the deposit as collateral, false otherwise.
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**/
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function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external override {
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_whenNotPaused();
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ReserveLogic.ReserveData storage reserve = _reserves[asset];
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ValidationLogic.validateSetUseReserveAsCollateral(
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reserve,
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asset,
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_reserves,
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_usersConfig[msg.sender],
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_reservesList,
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_addressesProvider.getPriceOracle()
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);
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_usersConfig[msg.sender].setUsingAsCollateral(reserve.id, useAsCollateral);
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if (useAsCollateral) {
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emit ReserveUsedAsCollateralEnabled(asset, msg.sender);
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} else {
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emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
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}
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}
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/**
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* @dev users can invoke this function to liquidate an undercollateralized position.
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* @param asset the address of the collateral to liquidated
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* @param asset the address of the principal reserve
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* @param user the address of the borrower
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* @param purchaseAmount the amount of principal that the liquidator wants to repay
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* @param receiveAToken true if the liquidators wants to receive the aTokens, false if
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* he wants to receive the underlying asset directly
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**/
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function liquidationCall(
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address collateral,
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address asset,
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address user,
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uint256 purchaseAmount,
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bool receiveAToken
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) external override {
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_whenNotPaused();
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address collateralManager = _addressesProvider.getLendingPoolCollateralManager();
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//solium-disable-next-line
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(bool success, bytes memory result) = collateralManager.delegatecall(
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abi.encodeWithSignature(
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'liquidationCall(address,address,address,uint256,bool)',
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collateral,
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asset,
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user,
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purchaseAmount,
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receiveAToken
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)
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);
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require(success, Errors.LIQUIDATION_CALL_FAILED);
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(uint256 returnCode, string memory returnMessage) = abi.decode(result, (uint256, string));
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if (returnCode != 0) {
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//error found
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revert(string(abi.encodePacked(returnMessage)));
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}
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}
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/**
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* @dev flashes the underlying collateral on an user to swap for the owed asset and repay
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* - Both the owner of the position and other liquidators can execute it
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* - The owner can repay with his collateral at any point, no matter the health factor
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* - Other liquidators can only use this function below 1 HF. To liquidate 50% of the debt > HF 0.98 or the whole below
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* @param collateral The address of the collateral asset
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* @param principal The address of the owed asset
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* @param user Address of the borrower
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* @param principalAmount Amount of the debt to repay. type(uint256).max to repay the maximum possible
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* @param receiver Address of the contract receiving the collateral to swap
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* @param params Variadic bytes param to pass with extra information to the receiver
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**/
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|
function repayWithCollateral(
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address collateral,
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address principal,
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address user,
|
|
uint256 principalAmount,
|
|
address receiver,
|
|
bytes calldata params
|
|
) external override {
|
|
_whenNotPaused();
|
|
require(!_flashLiquidationLocked, Errors.REENTRANCY_NOT_ALLOWED);
|
|
_flashLiquidationLocked = true;
|
|
|
|
address collateralManager = _addressesProvider.getLendingPoolCollateralManager();
|
|
|
|
//solium-disable-next-line
|
|
(bool success, bytes memory result) = collateralManager.delegatecall(
|
|
abi.encodeWithSignature(
|
|
'repayWithCollateral(address,address,address,uint256,address,bytes)',
|
|
collateral,
|
|
principal,
|
|
user,
|
|
principalAmount,
|
|
receiver,
|
|
params
|
|
)
|
|
);
|
|
require(success, Errors.FAILED_REPAY_WITH_COLLATERAL);
|
|
|
|
(uint256 returnCode, string memory returnMessage) = abi.decode(result, (uint256, string));
|
|
|
|
if (returnCode != 0) {
|
|
revert(string(abi.encodePacked(returnMessage)));
|
|
}
|
|
|
|
_flashLiquidationLocked = false;
|
|
}
|
|
|
|
struct FlashLoanLocalVars {
|
|
uint256 premium;
|
|
uint256 amountPlusPremium;
|
|
IFlashLoanReceiver receiver;
|
|
address aTokenAddress;
|
|
address oracle;
|
|
}
|
|
|
|
/**
|
|
* @dev allows smartcontracts to access the liquidity of the pool within one transaction,
|
|
* as long as the amount taken plus a fee is returned. NOTE There are security concerns for developers of flashloan receiver contracts
|
|
* that must be kept into consideration. For further details please visit https://developers.aave.com
|
|
* @param receiverAddress The address of the contract receiving the funds. The receiver should implement the IFlashLoanReceiver interface.
|
|
* @param asset The address of the principal reserve
|
|
* @param amount The amount requested for this flashloan
|
|
* @param mode Type of the debt to open if the flash loan is not returned. 0 -> Don't open any debt, just revert, 1 -> stable, 2 -> variable
|
|
* @param params Variadic packed params to pass to the receiver as extra information
|
|
* @param referralCode Referral code of the flash loan
|
|
**/
|
|
function flashLoan(
|
|
address receiverAddress,
|
|
address asset,
|
|
uint256 amount,
|
|
uint256 mode,
|
|
bytes calldata params,
|
|
uint16 referralCode
|
|
) external override {
|
|
_whenNotPaused();
|
|
ReserveLogic.ReserveData storage reserve = _reserves[asset];
|
|
FlashLoanLocalVars memory vars;
|
|
|
|
vars.aTokenAddress = reserve.aTokenAddress;
|
|
|
|
vars.premium = amount.mul(FLASHLOAN_PREMIUM_TOTAL).div(10000);
|
|
|
|
ValidationLogic.validateFlashloan(mode, vars.premium);
|
|
|
|
ReserveLogic.InterestRateMode debtMode = ReserveLogic.InterestRateMode(mode);
|
|
|
|
vars.receiver = IFlashLoanReceiver(receiverAddress);
|
|
|
|
//transfer funds to the receiver
|
|
IAToken(vars.aTokenAddress).transferUnderlyingTo(receiverAddress, amount);
|
|
|
|
//execute action of the receiver
|
|
vars.receiver.executeOperation(asset, amount, vars.premium, params);
|
|
|
|
vars.amountPlusPremium = amount.add(vars.premium);
|
|
|
|
if (debtMode == ReserveLogic.InterestRateMode.NONE) {
|
|
IERC20(asset).safeTransferFrom(receiverAddress, vars.aTokenAddress, vars.amountPlusPremium);
|
|
|
|
reserve.updateState();
|
|
reserve.cumulateToLiquidityIndex(IERC20(vars.aTokenAddress).totalSupply(), vars.premium);
|
|
reserve.updateInterestRates(asset, vars.aTokenAddress, vars.premium, 0);
|
|
|
|
emit FlashLoan(receiverAddress, asset, amount, vars.premium, referralCode);
|
|
} else {
|
|
//if the user didn't choose to return the funds, the system checks if there
|
|
//is enough collateral and eventually open a position
|
|
_executeBorrow(
|
|
ExecuteBorrowParams(
|
|
asset,
|
|
msg.sender,
|
|
msg.sender,
|
|
vars.amountPlusPremium,
|
|
mode,
|
|
vars.aTokenAddress,
|
|
referralCode,
|
|
false
|
|
)
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @dev Allows an user to release one of his assets deposited in the protocol, even if it is used as collateral, to swap for another.
|
|
* - It's not possible to release one asset to swap for the same
|
|
* @param receiverAddress The address of the contract receiving the funds. The receiver should implement the ISwapAdapter interface
|
|
* @param fromAsset Asset to swap from
|
|
* @param toAsset Asset to swap to
|
|
* @param params a bytes array to be sent (if needed) to the receiver contract with extra data
|
|
**/
|
|
function swapLiquidity(
|
|
address receiverAddress,
|
|
address fromAsset,
|
|
address toAsset,
|
|
uint256 amountToSwap,
|
|
bytes calldata params
|
|
) external override {
|
|
_whenNotPaused();
|
|
address collateralManager = _addressesProvider.getLendingPoolCollateralManager();
|
|
|
|
//solium-disable-next-line
|
|
(bool success, bytes memory result) = collateralManager.delegatecall(
|
|
abi.encodeWithSignature(
|
|
'swapLiquidity(address,address,address,uint256,bytes)',
|
|
receiverAddress,
|
|
fromAsset,
|
|
toAsset,
|
|
amountToSwap,
|
|
params
|
|
)
|
|
);
|
|
require(success, Errors.FAILED_COLLATERAL_SWAP);
|
|
|
|
(uint256 returnCode, string memory returnMessage) = abi.decode(result, (uint256, string));
|
|
|
|
if (returnCode != 0) {
|
|
revert(string(abi.encodePacked(returnMessage)));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @dev accessory functions to fetch data from the core contract
|
|
**/
|
|
|
|
function getReserveConfigurationData(address asset)
|
|
external
|
|
override
|
|
view
|
|
returns (
|
|
uint256 decimals,
|
|
uint256 ltv,
|
|
uint256 liquidationThreshold,
|
|
uint256 liquidationBonus,
|
|
uint256 reserveFactor,
|
|
address interestRateStrategyAddress,
|
|
bool usageAsCollateralEnabled,
|
|
bool borrowingEnabled,
|
|
bool stableBorrowRateEnabled,
|
|
bool isActive,
|
|
bool isFreezed
|
|
)
|
|
{
|
|
ReserveLogic.ReserveData storage reserve = _reserves[asset];
|
|
|
|
return (
|
|
reserve.configuration.getDecimals(),
|
|
reserve.configuration.getLtv(),
|
|
reserve.configuration.getLiquidationThreshold(),
|
|
reserve.configuration.getLiquidationBonus(),
|
|
reserve.configuration.getReserveFactor(),
|
|
reserve.interestRateStrategyAddress,
|
|
reserve.configuration.getLtv() != 0,
|
|
reserve.configuration.getBorrowingEnabled(),
|
|
reserve.configuration.getStableRateBorrowingEnabled(),
|
|
reserve.configuration.getActive(),
|
|
reserve.configuration.getFrozen()
|
|
);
|
|
}
|
|
|
|
function getReserveTokensAddresses(address asset)
|
|
external
|
|
override
|
|
view
|
|
returns (
|
|
address aTokenAddress,
|
|
address stableDebtTokenAddress,
|
|
address variableDebtTokenAddress
|
|
)
|
|
{
|
|
ReserveLogic.ReserveData storage reserve = _reserves[asset];
|
|
|
|
return (
|
|
reserve.aTokenAddress,
|
|
reserve.stableDebtTokenAddress,
|
|
reserve.variableDebtTokenAddress
|
|
);
|
|
}
|
|
|
|
function getReserveData(address asset)
|
|
external
|
|
override
|
|
view
|
|
returns (
|
|
uint256 availableLiquidity,
|
|
uint256 totalStableDebt,
|
|
uint256 totalVariableDebt,
|
|
uint256 liquidityRate,
|
|
uint256 variableBorrowRate,
|
|
uint256 stableBorrowRate,
|
|
uint256 averageStableBorrowRate,
|
|
uint256 liquidityIndex,
|
|
uint256 variableBorrowIndex,
|
|
uint40 lastUpdateTimestamp
|
|
)
|
|
{
|
|
ReserveLogic.ReserveData memory reserve = _reserves[asset];
|
|
|
|
return (
|
|
IERC20(asset).balanceOf(reserve.aTokenAddress),
|
|
IERC20(reserve.stableDebtTokenAddress).totalSupply(),
|
|
IERC20(reserve.variableDebtTokenAddress).totalSupply(),
|
|
reserve.currentLiquidityRate,
|
|
reserve.currentVariableBorrowRate,
|
|
reserve.currentStableBorrowRate,
|
|
IStableDebtToken(reserve.stableDebtTokenAddress).getAverageStableRate(),
|
|
reserve.liquidityIndex,
|
|
reserve.variableBorrowIndex,
|
|
reserve.lastUpdateTimestamp
|
|
);
|
|
}
|
|
|
|
function getUserAccountData(address user)
|
|
external
|
|
override
|
|
view
|
|
returns (
|
|
uint256 totalCollateralETH,
|
|
uint256 totalBorrowsETH,
|
|
uint256 availableBorrowsETH,
|
|
uint256 currentLiquidationThreshold,
|
|
uint256 ltv,
|
|
uint256 healthFactor
|
|
)
|
|
{
|
|
(
|
|
totalCollateralETH,
|
|
totalBorrowsETH,
|
|
ltv,
|
|
currentLiquidationThreshold,
|
|
healthFactor
|
|
) = GenericLogic.calculateUserAccountData(
|
|
user,
|
|
_reserves,
|
|
_usersConfig[user],
|
|
_reservesList,
|
|
_addressesProvider.getPriceOracle()
|
|
);
|
|
|
|
availableBorrowsETH = GenericLogic.calculateAvailableBorrowsETH(
|
|
totalCollateralETH,
|
|
totalBorrowsETH,
|
|
ltv
|
|
);
|
|
}
|
|
|
|
function getUserReserveData(address asset, address user)
|
|
external
|
|
override
|
|
view
|
|
returns (
|
|
uint256 currentATokenBalance,
|
|
uint256 currentStableDebt,
|
|
uint256 currentVariableDebt,
|
|
uint256 principalStableDebt,
|
|
uint256 scaledVariableDebt,
|
|
uint256 stableBorrowRate,
|
|
uint256 liquidityRate,
|
|
uint40 stableRateLastUpdated,
|
|
bool usageAsCollateralEnabled
|
|
)
|
|
{
|
|
ReserveLogic.ReserveData storage reserve = _reserves[asset];
|
|
|
|
currentATokenBalance = IERC20(reserve.aTokenAddress).balanceOf(user);
|
|
(currentStableDebt, currentVariableDebt) = Helpers.getUserCurrentDebt(user, reserve);
|
|
principalStableDebt = IStableDebtToken(reserve.stableDebtTokenAddress).principalBalanceOf(user);
|
|
scaledVariableDebt = IVariableDebtToken(reserve.variableDebtTokenAddress).scaledBalanceOf(user);
|
|
liquidityRate = reserve.currentLiquidityRate;
|
|
stableBorrowRate = IStableDebtToken(reserve.stableDebtTokenAddress).getUserStableRate(user);
|
|
stableRateLastUpdated = IStableDebtToken(reserve.stableDebtTokenAddress).getUserLastUpdated(
|
|
user
|
|
);
|
|
usageAsCollateralEnabled = _usersConfig[user].isUsingAsCollateral(reserve.id);
|
|
}
|
|
|
|
function getReserves() external override view returns (address[] memory) {
|
|
return _reservesList;
|
|
}
|
|
|
|
receive() external payable {
|
|
revert();
|
|
}
|
|
|
|
/**
|
|
* @dev initializes a reserve
|
|
* @param asset the address of the reserve
|
|
* @param aTokenAddress the address of the overlying aToken contract
|
|
* @param interestRateStrategyAddress the address of the interest rate strategy contract
|
|
**/
|
|
function initReserve(
|
|
address asset,
|
|
address aTokenAddress,
|
|
address stableDebtAddress,
|
|
address variableDebtAddress,
|
|
address interestRateStrategyAddress
|
|
) external override {
|
|
_onlyLendingPoolConfigurator();
|
|
_reserves[asset].init(
|
|
aTokenAddress,
|
|
stableDebtAddress,
|
|
variableDebtAddress,
|
|
interestRateStrategyAddress
|
|
);
|
|
_addReserveToList(asset);
|
|
}
|
|
|
|
/**
|
|
* @dev updates the address of the interest rate strategy contract
|
|
* @param asset the address of the reserve
|
|
* @param rateStrategyAddress the address of the interest rate strategy contract
|
|
**/
|
|
|
|
function setReserveInterestRateStrategyAddress(address asset, address rateStrategyAddress)
|
|
external
|
|
override
|
|
{
|
|
_onlyLendingPoolConfigurator();
|
|
_reserves[asset].interestRateStrategyAddress = rateStrategyAddress;
|
|
}
|
|
|
|
function setConfiguration(address asset, uint256 configuration) external override {
|
|
_onlyLendingPoolConfigurator();
|
|
_reserves[asset].configuration.data = configuration;
|
|
}
|
|
|
|
function getConfiguration(address asset)
|
|
external
|
|
override
|
|
view
|
|
returns (ReserveConfiguration.Map memory)
|
|
{
|
|
return _reserves[asset].configuration;
|
|
}
|
|
|
|
// internal functions
|
|
|
|
struct ExecuteBorrowParams {
|
|
address asset;
|
|
address user;
|
|
address onBehalfOf;
|
|
uint256 amount;
|
|
uint256 interestRateMode;
|
|
address aTokenAddress;
|
|
uint16 referralCode;
|
|
bool releaseUnderlying;
|
|
}
|
|
|
|
/**
|
|
* @dev Internal function to execute a borrowing action, allowing to transfer or not the underlying
|
|
* @param vars Input struct for the borrowing action, in order to avoid STD errors
|
|
**/
|
|
function _executeBorrow(ExecuteBorrowParams memory vars) internal {
|
|
ReserveLogic.ReserveData storage reserve = _reserves[vars.asset];
|
|
UserConfiguration.Map storage userConfig = _usersConfig[vars.onBehalfOf];
|
|
|
|
address oracle = _addressesProvider.getPriceOracle();
|
|
|
|
uint256 amountInETH = IPriceOracleGetter(oracle).getAssetPrice(vars.asset).mul(vars.amount).div(
|
|
10**reserve.configuration.getDecimals()
|
|
);
|
|
|
|
ValidationLogic.validateBorrow(
|
|
reserve,
|
|
vars.onBehalfOf,
|
|
vars.amount,
|
|
amountInETH,
|
|
vars.interestRateMode,
|
|
MAX_STABLE_RATE_BORROW_SIZE_PERCENT,
|
|
_reserves,
|
|
userConfig,
|
|
_reservesList,
|
|
oracle
|
|
);
|
|
|
|
uint256 reserveId = reserve.id;
|
|
if (!userConfig.isBorrowing(reserveId)) {
|
|
userConfig.setBorrowing(reserveId, true);
|
|
}
|
|
|
|
reserve.updateState();
|
|
|
|
//caching the current stable borrow rate
|
|
uint256 currentStableRate = 0;
|
|
|
|
if (
|
|
ReserveLogic.InterestRateMode(vars.interestRateMode) == ReserveLogic.InterestRateMode.STABLE
|
|
) {
|
|
currentStableRate = reserve.currentStableBorrowRate;
|
|
|
|
IStableDebtToken(reserve.stableDebtTokenAddress).mint(
|
|
vars.onBehalfOf,
|
|
vars.amount,
|
|
currentStableRate
|
|
);
|
|
} else {
|
|
IVariableDebtToken(reserve.variableDebtTokenAddress).mint(
|
|
vars.onBehalfOf,
|
|
vars.amount,
|
|
reserve.variableBorrowIndex
|
|
);
|
|
}
|
|
|
|
reserve.updateInterestRates(
|
|
vars.asset,
|
|
vars.aTokenAddress,
|
|
0,
|
|
vars.releaseUnderlying ? vars.amount : 0
|
|
);
|
|
|
|
if (vars.releaseUnderlying) {
|
|
IAToken(vars.aTokenAddress).transferUnderlyingTo(vars.user, vars.amount);
|
|
}
|
|
|
|
emit Borrow(
|
|
vars.asset,
|
|
vars.user,
|
|
vars.onBehalfOf,
|
|
vars.amount,
|
|
vars.interestRateMode,
|
|
ReserveLogic.InterestRateMode(vars.interestRateMode) == ReserveLogic.InterestRateMode.STABLE
|
|
? currentStableRate
|
|
: reserve.currentVariableBorrowRate,
|
|
vars.referralCode
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @dev adds a reserve to the array of the _reserves address
|
|
**/
|
|
function _addReserveToList(address asset) internal {
|
|
bool reserveAlreadyAdded = false;
|
|
require(_reservesList.length < MAX_NUMBER_RESERVES, Errors.NO_MORE_RESERVES_ALLOWED);
|
|
for (uint256 i = 0; i < _reservesList.length; i++)
|
|
if (_reservesList[i] == asset) {
|
|
reserveAlreadyAdded = true;
|
|
}
|
|
if (!reserveAlreadyAdded) {
|
|
_reserves[asset].id = uint8(_reservesList.length);
|
|
_reservesList.push(asset);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @dev returns the normalized income per unit of asset
|
|
* @param asset the address of the reserve
|
|
* @return the reserve normalized income
|
|
*/
|
|
function getReserveNormalizedIncome(address asset) external override view returns (uint256) {
|
|
return _reserves[asset].getNormalizedIncome();
|
|
}
|
|
|
|
/**
|
|
* @dev returns the normalized variable debt per unit of asset
|
|
* @param asset the address of the reserve
|
|
* @return the reserve normalized debt
|
|
*/
|
|
function getReserveNormalizedVariableDebt(address asset)
|
|
external
|
|
override
|
|
view
|
|
returns (uint256)
|
|
{
|
|
return _reserves[asset].getNormalizedDebt();
|
|
}
|
|
|
|
/**
|
|
* @dev validate if a balance decrease for an asset is allowed
|
|
* @param asset the address of the reserve
|
|
* @param user the user related to the balance decrease
|
|
* @param amount the amount being transferred/redeemed
|
|
* @return true if the balance decrease can be allowed, false otherwise
|
|
*/
|
|
function balanceDecreaseAllowed(
|
|
address asset,
|
|
address user,
|
|
uint256 amount
|
|
) external override view returns (bool) {
|
|
_whenNotPaused();
|
|
return
|
|
GenericLogic.balanceDecreaseAllowed(
|
|
asset,
|
|
user,
|
|
amount,
|
|
_reserves,
|
|
_usersConfig[user],
|
|
_reservesList,
|
|
_addressesProvider.getPriceOracle()
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @dev Set the _pause state
|
|
* @param val the boolean value to set the current pause state of LendingPool
|
|
*/
|
|
function setPause(bool val) external override {
|
|
_onlyLendingPoolConfigurator();
|
|
|
|
_paused = val;
|
|
if (_paused) {
|
|
emit Paused();
|
|
} else {
|
|
emit Unpaused();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @dev Returns if the LendingPool is paused
|
|
*/
|
|
function paused() external override view returns (bool) {
|
|
return _paused;
|
|
}
|
|
}
|