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Updated interest rate strategy to generalize fetching of the available liquidity

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This commit is contained in:
The3D 2021-03-01 15:58:31 +01:00
parent 0302339892
commit 03a410230d
3 changed files with 16 additions and 7 deletions
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4
contracts/interfaces/IReserveInterestRateStrategy.sol
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@ -13,7 +13,9 @@ interface IReserveInterestRateStrategy {
function calculateInterestRates(
address reserve,
uint256 utilizationRate,
address aToken,
uint256 liquidityAdded,
uint256 liquidityTaken,
uint256 totalStableDebt,
uint256 totalVariableDebt,
uint256 averageStableBorrowRate,

13
contracts/protocol/lendingpool/DefaultReserveInterestRateStrategy.sol
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@ -7,6 +7,7 @@ import {WadRayMath} from '../libraries/math/WadRayMath.sol';
import {PercentageMath} from '../libraries/math/PercentageMath.sol';
import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol';
import {ILendingRateOracle} from '../../interfaces/ILendingRateOracle.sol';
import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol';
/**
* @title DefaultReserveInterestRateStrategy contract
@ -102,12 +103,14 @@ contract DefaultReserveInterestRateStrategy is IReserveInterestRateStrategy {
uint256 currentStableBorrowRate;
uint256 currentLiquidityRate;
uint256 utilizationRate;
uint256 availableLiquidity;
}
/**
* @dev Calculates the interest rates depending on the reserve's state and configurations
* @param reserve The address of the reserve
* @param availableLiquidity The liquidity available in the reserve
* @param liquidityAdded The liquidity added during the operation
* @param liquidityTaken The liquidity taken during the operation
* @param totalStableDebt The total borrowed from the reserve a stable rate
* @param totalVariableDebt The total borrowed from the reserve at a variable rate
* @param averageStableBorrowRate The weighted average of all the stable rate loans
@ -116,7 +119,9 @@ contract DefaultReserveInterestRateStrategy is IReserveInterestRateStrategy {
**/
function calculateInterestRates(
address reserve,
uint256 availableLiquidity,
address aToken,
uint256 liquidityAdded,
uint256 liquidityTaken,
uint256 totalStableDebt,
uint256 totalVariableDebt,
uint256 averageStableBorrowRate,
@ -137,9 +142,11 @@ contract DefaultReserveInterestRateStrategy is IReserveInterestRateStrategy {
vars.currentVariableBorrowRate = 0;
vars.currentStableBorrowRate = 0;
vars.currentLiquidityRate = 0;
vars.availableLiquidity = IERC20(reserve).balanceOf(aToken);
vars.availableLiquidity = vars.availableLiquidity.add(liquidityAdded).sub(liquidityTaken);
uint256 utilizationRate =
vars.totalDebt == 0 ? 0 : vars.totalDebt.rayDiv(availableLiquidity.add(vars.totalDebt));
vars.totalDebt == 0 ? 0 : vars.totalDebt.rayDiv(vars.availableLiquidity.add(vars.totalDebt));
vars.currentStableBorrowRate = ILendingRateOracle(addressesProvider.getLendingRateOracle())
.getMarketBorrowRate(reserve);

6
contracts/protocol/libraries/logic/ReserveLogic.sol
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@ -216,15 +216,15 @@ library ReserveLogic {
.scaledTotalSupply()
.rayMul(reserve.variableBorrowIndex);
vars.availableLiquidity = IERC20(reserveAddress).balanceOf(aTokenAddress);
(
vars.newLiquidityRate,
vars.newStableRate,
vars.newVariableRate
) = IReserveInterestRateStrategy(reserve.interestRateStrategyAddress).calculateInterestRates(
reserveAddress,
vars.availableLiquidity.add(liquidityAdded).sub(liquidityTaken),
aTokenAddress,
liquidityAdded,
liquidityTaken,
vars.totalStableDebt,
vars.totalVariableDebt,
vars.avgStableRate,