mirror of
https://github.com/Instadapp/aave-protocol-v2.git
synced 2024-07-29 21:47:30 +00:00
1240 lines
40 KiB
TypeScript
1240 lines
40 KiB
TypeScript
import BigNumber from 'bignumber.js';
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import {
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ONE_YEAR,
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RAY,
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MAX_UINT_AMOUNT,
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OPTIMAL_UTILIZATION_RATE,
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EXCESS_UTILIZATION_RATE,
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ZERO_ADDRESS,
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} from '../../../helpers/constants';
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import {IReserveParams, iAavePoolAssets, RateMode} from '../../../helpers/types';
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import './math';
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import {ReserveData, UserReserveData} from './interfaces';
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export const strToBN = (amount: string): BigNumber => new BigNumber(amount);
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interface Configuration {
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reservesParams: iAavePoolAssets<IReserveParams>;
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}
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export const configuration: Configuration = <Configuration>{};
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export const calcExpectedUserDataAfterDeposit = (
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amountDeposited: string,
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reserveDataBeforeAction: ReserveData,
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reserveDataAfterAction: ReserveData,
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userDataBeforeAction: UserReserveData,
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txTimestamp: BigNumber,
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currentTimestamp: BigNumber,
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txCost: BigNumber
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): UserReserveData => {
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const expectedUserData = <UserReserveData>{};
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expectedUserData.currentStableDebt = expectedUserData.principalStableDebt = calcExpectedStableDebtTokenBalance(
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userDataBeforeAction,
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txTimestamp
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);
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expectedUserData.currentVariableDebt = expectedUserData.principalStableDebt = calcExpectedVariableDebtTokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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);
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expectedUserData.principalStableDebt = userDataBeforeAction.principalStableDebt;
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expectedUserData.principalVariableDebt = userDataBeforeAction.principalVariableDebt;
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expectedUserData.variableBorrowIndex = userDataBeforeAction.variableBorrowIndex;
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expectedUserData.stableBorrowRate = userDataBeforeAction.stableBorrowRate;
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expectedUserData.stableRateLastUpdated = userDataBeforeAction.stableRateLastUpdated;
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expectedUserData.liquidityRate = reserveDataAfterAction.liquidityRate;
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expectedUserData.scaledATokenBalance = calcExpectedScaledATokenBalance(
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userDataBeforeAction,
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reserveDataAfterAction.liquidityIndex,
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new BigNumber(amountDeposited),
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new BigNumber(0)
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);
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expectedUserData.currentATokenBalance = calcExpectedATokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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).plus(amountDeposited);
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if (userDataBeforeAction.currentATokenBalance.eq(0)) {
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expectedUserData.usageAsCollateralEnabled = true;
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} else {
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expectedUserData.usageAsCollateralEnabled = userDataBeforeAction.usageAsCollateralEnabled;
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}
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expectedUserData.variableBorrowIndex = userDataBeforeAction.variableBorrowIndex;
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expectedUserData.walletBalance = userDataBeforeAction.walletBalance.minus(amountDeposited);
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expectedUserData.currentStableDebt = expectedUserData.principalStableDebt = calcExpectedStableDebtTokenBalance(
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userDataBeforeAction,
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txTimestamp
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);
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expectedUserData.currentVariableDebt = expectedUserData.principalStableDebt = calcExpectedVariableDebtTokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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);
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return expectedUserData;
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};
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export const calcExpectedUserDataAfterWithdraw = (
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amountWithdrawn: string,
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reserveDataBeforeAction: ReserveData,
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reserveDataAfterAction: ReserveData,
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userDataBeforeAction: UserReserveData,
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txTimestamp: BigNumber,
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currentTimestamp: BigNumber,
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txCost: BigNumber
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): UserReserveData => {
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const expectedUserData = <UserReserveData>{};
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const aTokenBalance = calcExpectedATokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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);
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if (amountWithdrawn == MAX_UINT_AMOUNT) {
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amountWithdrawn = aTokenBalance.toFixed(0);
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}
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expectedUserData.scaledATokenBalance = calcExpectedScaledATokenBalance(
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userDataBeforeAction,
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reserveDataAfterAction.liquidityIndex,
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new BigNumber(0),
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new BigNumber(amountWithdrawn)
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);
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expectedUserData.currentATokenBalance = aTokenBalance.minus(amountWithdrawn);
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expectedUserData.principalStableDebt = userDataBeforeAction.principalStableDebt;
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expectedUserData.principalVariableDebt = userDataBeforeAction.principalVariableDebt;
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expectedUserData.currentStableDebt = calcExpectedStableDebtTokenBalance(
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userDataBeforeAction,
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txTimestamp
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);
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expectedUserData.currentVariableDebt = calcExpectedVariableDebtTokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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);
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expectedUserData.variableBorrowIndex = userDataBeforeAction.variableBorrowIndex;
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expectedUserData.stableBorrowRate = userDataBeforeAction.stableBorrowRate;
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expectedUserData.stableRateLastUpdated = userDataBeforeAction.stableRateLastUpdated;
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expectedUserData.liquidityRate = reserveDataAfterAction.liquidityRate;
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if (userDataBeforeAction.currentATokenBalance.eq(0)) {
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expectedUserData.usageAsCollateralEnabled = true;
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} else {
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//if the user is withdrawing everything, usageAsCollateralEnabled must be false
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if (expectedUserData.currentATokenBalance.eq(0)) {
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expectedUserData.usageAsCollateralEnabled = false;
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} else {
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expectedUserData.usageAsCollateralEnabled = userDataBeforeAction.usageAsCollateralEnabled;
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}
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}
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expectedUserData.walletBalance = userDataBeforeAction.walletBalance.plus(amountWithdrawn);
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return expectedUserData;
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};
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export const calcExpectedReserveDataAfterDeposit = (
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amountDeposited: string,
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reserveDataBeforeAction: ReserveData,
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txTimestamp: BigNumber
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): ReserveData => {
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const expectedReserveData: ReserveData = <ReserveData>{};
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expectedReserveData.address = reserveDataBeforeAction.address;
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expectedReserveData.totalLiquidity = new BigNumber(reserveDataBeforeAction.totalLiquidity).plus(
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amountDeposited
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);
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expectedReserveData.availableLiquidity = new BigNumber(
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reserveDataBeforeAction.availableLiquidity
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).plus(amountDeposited);
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expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable;
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expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable;
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expectedReserveData.averageStableBorrowRate = reserveDataBeforeAction.averageStableBorrowRate;
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expectedReserveData.utilizationRate = calcExpectedUtilizationRate(
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expectedReserveData.totalBorrowsStable,
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expectedReserveData.totalBorrowsVariable,
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expectedReserveData.totalLiquidity
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);
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const rates = calcExpectedInterestRates(
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reserveDataBeforeAction.symbol,
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reserveDataBeforeAction.marketStableRate,
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expectedReserveData.utilizationRate,
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expectedReserveData.totalBorrowsStable,
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expectedReserveData.totalBorrowsVariable,
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expectedReserveData.averageStableBorrowRate
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);
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expectedReserveData.liquidityRate = rates[0];
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expectedReserveData.stableBorrowRate = rates[1];
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expectedReserveData.variableBorrowRate = rates[2];
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expectedReserveData.averageStableBorrowRate = reserveDataBeforeAction.averageStableBorrowRate;
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expectedReserveData.liquidityIndex = calcExpectedLiquidityIndex(
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reserveDataBeforeAction,
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txTimestamp
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);
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expectedReserveData.variableBorrowIndex = calcExpectedVariableBorrowIndex(
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reserveDataBeforeAction,
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txTimestamp
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);
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return expectedReserveData;
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};
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export const calcExpectedReserveDataAfterWithdraw = (
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amountWithdrawn: string,
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reserveDataBeforeAction: ReserveData,
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userDataBeforeAction: UserReserveData,
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txTimestamp: BigNumber
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): ReserveData => {
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const expectedReserveData: ReserveData = <ReserveData>{};
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expectedReserveData.address = reserveDataBeforeAction.address;
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if (amountWithdrawn == MAX_UINT_AMOUNT) {
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amountWithdrawn = calcExpectedATokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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).toFixed();
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}
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expectedReserveData.totalLiquidity = new BigNumber(reserveDataBeforeAction.totalLiquidity).minus(
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amountWithdrawn
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);
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expectedReserveData.availableLiquidity = new BigNumber(
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reserveDataBeforeAction.availableLiquidity
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).minus(amountWithdrawn);
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expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable;
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expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable;
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expectedReserveData.averageStableBorrowRate = reserveDataBeforeAction.averageStableBorrowRate;
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expectedReserveData.utilizationRate = calcExpectedUtilizationRate(
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expectedReserveData.totalBorrowsStable,
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expectedReserveData.totalBorrowsVariable,
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expectedReserveData.totalLiquidity
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);
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const rates = calcExpectedInterestRates(
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reserveDataBeforeAction.symbol,
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reserveDataBeforeAction.marketStableRate,
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expectedReserveData.utilizationRate,
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expectedReserveData.totalBorrowsStable,
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expectedReserveData.totalBorrowsVariable,
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expectedReserveData.averageStableBorrowRate
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);
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expectedReserveData.liquidityRate = rates[0];
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expectedReserveData.stableBorrowRate = rates[1];
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expectedReserveData.variableBorrowRate = rates[2];
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expectedReserveData.averageStableBorrowRate = reserveDataBeforeAction.averageStableBorrowRate;
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expectedReserveData.liquidityIndex = calcExpectedLiquidityIndex(
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reserveDataBeforeAction,
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txTimestamp
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);
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expectedReserveData.variableBorrowIndex = calcExpectedVariableBorrowIndex(
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reserveDataBeforeAction,
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txTimestamp
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);
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return expectedReserveData;
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};
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export const calcExpectedReserveDataAfterBorrow = (
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amountBorrowed: string,
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borrowRateMode: string,
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reserveDataBeforeAction: ReserveData,
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userDataBeforeAction: UserReserveData,
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txTimestamp: BigNumber,
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currentTimestamp: BigNumber
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): ReserveData => {
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const expectedReserveData = <ReserveData>{};
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expectedReserveData.address = reserveDataBeforeAction.address;
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const amountBorrowedBN = new BigNumber(amountBorrowed);
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const userStableBorrowBalance = calcExpectedStableDebtTokenBalance(
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userDataBeforeAction,
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txTimestamp
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);
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const userVariableBorrowBalance = calcExpectedVariableDebtTokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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);
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if (borrowRateMode == RateMode.Stable) {
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const debtAccrued = userStableBorrowBalance.minus(userDataBeforeAction.principalStableDebt);
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expectedReserveData.totalLiquidity = reserveDataBeforeAction.totalLiquidity.plus(debtAccrued);
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expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable
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.plus(amountBorrowedBN)
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.plus(debtAccrued);
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expectedReserveData.averageStableBorrowRate = calcExpectedAverageStableBorrowRate(
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reserveDataBeforeAction.averageStableBorrowRate,
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reserveDataBeforeAction.totalBorrowsStable.plus(debtAccrued),
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amountBorrowedBN,
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reserveDataBeforeAction.stableBorrowRate
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);
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expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable;
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} else {
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const debtAccrued = userVariableBorrowBalance.minus(userDataBeforeAction.principalVariableDebt);
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expectedReserveData.totalLiquidity = reserveDataBeforeAction.totalLiquidity.plus(debtAccrued);
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expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable
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.plus(amountBorrowedBN)
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.plus(debtAccrued);
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expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable;
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expectedReserveData.averageStableBorrowRate = reserveDataBeforeAction.averageStableBorrowRate;
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}
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expectedReserveData.availableLiquidity = reserveDataBeforeAction.availableLiquidity.minus(
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amountBorrowedBN
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);
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expectedReserveData.utilizationRate = calcExpectedUtilizationRate(
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expectedReserveData.totalBorrowsStable,
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expectedReserveData.totalBorrowsVariable,
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expectedReserveData.totalLiquidity
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);
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const rates = calcExpectedInterestRates(
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reserveDataBeforeAction.symbol,
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reserveDataBeforeAction.marketStableRate,
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expectedReserveData.utilizationRate,
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expectedReserveData.totalBorrowsStable,
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expectedReserveData.totalBorrowsVariable,
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expectedReserveData.averageStableBorrowRate
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);
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expectedReserveData.liquidityRate = rates[0];
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expectedReserveData.stableBorrowRate = rates[1];
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expectedReserveData.variableBorrowRate = rates[2];
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expectedReserveData.liquidityIndex = calcExpectedLiquidityIndex(
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reserveDataBeforeAction,
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txTimestamp
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);
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expectedReserveData.variableBorrowIndex = calcExpectedVariableBorrowIndex(
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reserveDataBeforeAction,
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txTimestamp
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);
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expectedReserveData.lastUpdateTimestamp = txTimestamp;
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return expectedReserveData;
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};
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export const calcExpectedReserveDataAfterRepay = (
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amountRepaid: string,
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borrowRateMode: RateMode,
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reserveDataBeforeAction: ReserveData,
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userDataBeforeAction: UserReserveData,
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txTimestamp: BigNumber,
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currentTimestamp: BigNumber
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): ReserveData => {
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const expectedReserveData: ReserveData = <ReserveData>{};
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expectedReserveData.address = reserveDataBeforeAction.address;
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let amountRepaidBN = new BigNumber(amountRepaid);
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const userStableBorrowBalance = calcExpectedStableDebtTokenBalance(
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userDataBeforeAction,
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txTimestamp
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);
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const userVariableBorrowBalance = calcExpectedVariableDebtTokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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);
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//if amount repaid = MAX_UINT_AMOUNT, user is repaying everything
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if (amountRepaidBN.abs().eq(MAX_UINT_AMOUNT)) {
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if (borrowRateMode == RateMode.Stable) {
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amountRepaidBN = userStableBorrowBalance;
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} else {
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amountRepaidBN = userVariableBorrowBalance;
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}
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}
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if (borrowRateMode == RateMode.Stable) {
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const debtAccrued = userStableBorrowBalance.minus(userDataBeforeAction.principalStableDebt);
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expectedReserveData.totalLiquidity = reserveDataBeforeAction.totalLiquidity.plus(debtAccrued);
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expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable
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.minus(amountRepaidBN)
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.plus(debtAccrued);
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expectedReserveData.averageStableBorrowRate = calcExpectedAverageStableBorrowRate(
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reserveDataBeforeAction.averageStableBorrowRate,
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reserveDataBeforeAction.totalBorrowsStable.plus(debtAccrued),
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amountRepaidBN.negated(),
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userDataBeforeAction.stableBorrowRate
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);
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expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable;
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} else {
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const debtAccrued = userVariableBorrowBalance.minus(userDataBeforeAction.principalVariableDebt);
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expectedReserveData.totalLiquidity = reserveDataBeforeAction.totalLiquidity.plus(debtAccrued);
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expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable
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.plus(debtAccrued)
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.minus(amountRepaidBN);
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expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable;
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expectedReserveData.averageStableBorrowRate = reserveDataBeforeAction.averageStableBorrowRate;
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}
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expectedReserveData.availableLiquidity = reserveDataBeforeAction.availableLiquidity.plus(
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amountRepaidBN
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);
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expectedReserveData.availableLiquidity = reserveDataBeforeAction.availableLiquidity.plus(
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amountRepaidBN
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);
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expectedReserveData.utilizationRate = calcExpectedUtilizationRate(
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expectedReserveData.totalBorrowsStable,
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expectedReserveData.totalBorrowsVariable,
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expectedReserveData.totalLiquidity
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);
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const rates = calcExpectedInterestRates(
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reserveDataBeforeAction.symbol,
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reserveDataBeforeAction.marketStableRate,
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expectedReserveData.utilizationRate,
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expectedReserveData.totalBorrowsStable,
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expectedReserveData.totalBorrowsVariable,
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expectedReserveData.averageStableBorrowRate
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);
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expectedReserveData.liquidityRate = rates[0];
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expectedReserveData.stableBorrowRate = rates[1];
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expectedReserveData.variableBorrowRate = rates[2];
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expectedReserveData.liquidityIndex = calcExpectedLiquidityIndex(
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reserveDataBeforeAction,
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txTimestamp
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);
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expectedReserveData.variableBorrowIndex = calcExpectedVariableBorrowIndex(
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reserveDataBeforeAction,
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txTimestamp
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);
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expectedReserveData.lastUpdateTimestamp = txTimestamp;
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return expectedReserveData;
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};
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|
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export const calcExpectedUserDataAfterBorrow = (
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amountBorrowed: string,
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interestRateMode: string,
|
|
reserveDataBeforeAction: ReserveData,
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|
expectedDataAfterAction: ReserveData,
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|
userDataBeforeAction: UserReserveData,
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txTimestamp: BigNumber,
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currentTimestamp: BigNumber,
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txCost: BigNumber
|
|
): UserReserveData => {
|
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const expectedUserData = <UserReserveData>{};
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const currentStableDebt = calcExpectedStableDebtTokenBalance(userDataBeforeAction, txTimestamp);
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|
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const currentVariableDebt = calcExpectedVariableDebtTokenBalance(
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reserveDataBeforeAction,
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userDataBeforeAction,
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txTimestamp
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);
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|
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if (interestRateMode == RateMode.Stable) {
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const debtAccrued = currentStableDebt.minus(userDataBeforeAction.principalStableDebt);
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expectedUserData.principalStableDebt = currentStableDebt.plus(amountBorrowed);
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expectedUserData.principalVariableDebt = userDataBeforeAction.principalVariableDebt;
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expectedUserData.stableBorrowRate = calcExpectedUserStableRate(
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userDataBeforeAction.principalStableDebt.plus(debtAccrued),
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userDataBeforeAction.stableBorrowRate,
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|
new BigNumber(amountBorrowed),
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reserveDataBeforeAction.stableBorrowRate
|
|
);
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expectedUserData.stableRateLastUpdated = txTimestamp;
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} else {
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expectedUserData.principalVariableDebt = currentVariableDebt.plus(amountBorrowed);
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expectedUserData.principalStableDebt = userDataBeforeAction.principalStableDebt;
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expectedUserData.stableBorrowRate = userDataBeforeAction.stableBorrowRate;
|
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|
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expectedUserData.stableRateLastUpdated = userDataBeforeAction.stableRateLastUpdated;
|
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}
|
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|
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expectedUserData.currentStableDebt = calcExpectedStableDebtTokenBalance(
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{
|
|
...userDataBeforeAction,
|
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currentStableDebt: expectedUserData.principalStableDebt,
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|
principalStableDebt: expectedUserData.principalStableDebt,
|
|
stableBorrowRate: expectedUserData.stableBorrowRate,
|
|
stableRateLastUpdated: expectedUserData.stableRateLastUpdated,
|
|
},
|
|
currentTimestamp
|
|
);
|
|
|
|
expectedUserData.currentVariableDebt = calcExpectedVariableDebtTokenBalance(
|
|
expectedDataAfterAction,
|
|
{
|
|
...userDataBeforeAction,
|
|
currentVariableDebt: expectedUserData.principalVariableDebt,
|
|
principalVariableDebt: expectedUserData.principalVariableDebt,
|
|
variableBorrowIndex:
|
|
interestRateMode == RateMode.Variable
|
|
? expectedDataAfterAction.variableBorrowIndex
|
|
: userDataBeforeAction.variableBorrowIndex,
|
|
},
|
|
currentTimestamp
|
|
);
|
|
|
|
if (expectedUserData.principalVariableDebt.eq(0)) {
|
|
expectedUserData.variableBorrowIndex = new BigNumber(0);
|
|
} else {
|
|
expectedUserData.variableBorrowIndex =
|
|
interestRateMode == RateMode.Variable
|
|
? expectedDataAfterAction.variableBorrowIndex
|
|
: userDataBeforeAction.variableBorrowIndex;
|
|
}
|
|
|
|
expectedUserData.liquidityRate = expectedDataAfterAction.liquidityRate;
|
|
|
|
expectedUserData.usageAsCollateralEnabled = userDataBeforeAction.usageAsCollateralEnabled;
|
|
|
|
expectedUserData.currentATokenBalance = calcExpectedATokenBalance(
|
|
expectedDataAfterAction,
|
|
userDataBeforeAction,
|
|
currentTimestamp
|
|
);
|
|
expectedUserData.scaledATokenBalance = userDataBeforeAction.scaledATokenBalance;
|
|
|
|
expectedUserData.walletBalance = userDataBeforeAction.walletBalance.plus(amountBorrowed);
|
|
|
|
return expectedUserData;
|
|
};
|
|
|
|
export const calcExpectedUserDataAfterRepay = (
|
|
totalRepaid: string,
|
|
rateMode: RateMode,
|
|
reserveDataBeforeAction: ReserveData,
|
|
expectedDataAfterAction: ReserveData,
|
|
userDataBeforeAction: UserReserveData,
|
|
user: string,
|
|
onBehalfOf: string,
|
|
txTimestamp: BigNumber,
|
|
currentTimestamp: BigNumber,
|
|
txCost: BigNumber
|
|
): UserReserveData => {
|
|
const expectedUserData = <UserReserveData>{};
|
|
|
|
const variableBorrowBalance = calcExpectedVariableDebtTokenBalance(
|
|
reserveDataBeforeAction,
|
|
userDataBeforeAction,
|
|
currentTimestamp
|
|
);
|
|
|
|
const stableBorrowBalance = calcExpectedStableDebtTokenBalance(
|
|
userDataBeforeAction,
|
|
currentTimestamp
|
|
);
|
|
|
|
if (new BigNumber(totalRepaid).abs().eq(MAX_UINT_AMOUNT)) {
|
|
totalRepaid =
|
|
rateMode == RateMode.Stable
|
|
? stableBorrowBalance.toFixed(0)
|
|
: variableBorrowBalance.toFixed();
|
|
}
|
|
|
|
if (rateMode == RateMode.Stable) {
|
|
expectedUserData.principalVariableDebt = userDataBeforeAction.principalVariableDebt;
|
|
expectedUserData.currentVariableDebt = variableBorrowBalance;
|
|
expectedUserData.variableBorrowIndex = userDataBeforeAction.variableBorrowIndex;
|
|
|
|
expectedUserData.currentStableDebt = expectedUserData.principalStableDebt = stableBorrowBalance.minus(
|
|
totalRepaid
|
|
);
|
|
|
|
if (expectedUserData.currentStableDebt.eq('0')) {
|
|
//user repaid everything
|
|
expectedUserData.stableBorrowRate = expectedUserData.stableRateLastUpdated = new BigNumber(
|
|
'0'
|
|
);
|
|
} else {
|
|
expectedUserData.stableBorrowRate = userDataBeforeAction.stableBorrowRate;
|
|
expectedUserData.stableRateLastUpdated = txTimestamp;
|
|
}
|
|
} else {
|
|
expectedUserData.currentStableDebt = stableBorrowBalance;
|
|
expectedUserData.principalStableDebt = userDataBeforeAction.principalStableDebt;
|
|
expectedUserData.stableBorrowRate = userDataBeforeAction.stableBorrowRate;
|
|
expectedUserData.stableRateLastUpdated = userDataBeforeAction.stableRateLastUpdated;
|
|
|
|
expectedUserData.currentVariableDebt = expectedUserData.principalVariableDebt = variableBorrowBalance.minus(
|
|
totalRepaid
|
|
);
|
|
|
|
if (expectedUserData.currentVariableDebt.eq('0')) {
|
|
//user repaid everything
|
|
expectedUserData.variableBorrowIndex = new BigNumber('0');
|
|
} else {
|
|
expectedUserData.variableBorrowIndex = expectedDataAfterAction.variableBorrowIndex;
|
|
}
|
|
}
|
|
|
|
expectedUserData.liquidityRate = expectedDataAfterAction.liquidityRate;
|
|
|
|
expectedUserData.usageAsCollateralEnabled = userDataBeforeAction.usageAsCollateralEnabled;
|
|
|
|
expectedUserData.currentATokenBalance = calcExpectedATokenBalance(
|
|
reserveDataBeforeAction,
|
|
userDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
expectedUserData.scaledATokenBalance = userDataBeforeAction.scaledATokenBalance;
|
|
|
|
if (user === onBehalfOf) {
|
|
expectedUserData.walletBalance = userDataBeforeAction.walletBalance.minus(totalRepaid);
|
|
} else {
|
|
//wallet balance didn't change
|
|
expectedUserData.walletBalance = userDataBeforeAction.walletBalance;
|
|
}
|
|
|
|
return expectedUserData;
|
|
};
|
|
|
|
export const calcExpectedUserDataAfterSetUseAsCollateral = (
|
|
useAsCollateral: boolean,
|
|
reserveDataBeforeAction: ReserveData,
|
|
userDataBeforeAction: UserReserveData,
|
|
txCost: BigNumber
|
|
): UserReserveData => {
|
|
const expectedUserData = {...userDataBeforeAction};
|
|
|
|
expectedUserData.usageAsCollateralEnabled = useAsCollateral;
|
|
|
|
return expectedUserData;
|
|
};
|
|
|
|
export const calcExpectedReserveDataAfterSwapRateMode = (
|
|
reserveDataBeforeAction: ReserveData,
|
|
userDataBeforeAction: UserReserveData,
|
|
rateMode: string,
|
|
txTimestamp: BigNumber
|
|
): ReserveData => {
|
|
const expectedReserveData: ReserveData = <ReserveData>{};
|
|
|
|
expectedReserveData.address = reserveDataBeforeAction.address;
|
|
|
|
const variableBorrowBalance = calcExpectedVariableDebtTokenBalance(
|
|
reserveDataBeforeAction,
|
|
userDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
|
|
const stableBorrowBalance = calcExpectedStableDebtTokenBalance(userDataBeforeAction, txTimestamp);
|
|
|
|
expectedReserveData.availableLiquidity = reserveDataBeforeAction.availableLiquidity;
|
|
|
|
if (rateMode === RateMode.Stable) {
|
|
//swap user stable debt to variable
|
|
const debtAccrued = stableBorrowBalance.minus(userDataBeforeAction.principalStableDebt);
|
|
|
|
expectedReserveData.totalLiquidity = reserveDataBeforeAction.totalLiquidity.plus(debtAccrued);
|
|
|
|
expectedReserveData.averageStableBorrowRate = calcExpectedAverageStableBorrowRate(
|
|
reserveDataBeforeAction.averageStableBorrowRate,
|
|
reserveDataBeforeAction.totalBorrowsStable.plus(debtAccrued),
|
|
stableBorrowBalance.negated(),
|
|
userDataBeforeAction.stableBorrowRate
|
|
);
|
|
|
|
expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable.plus(
|
|
stableBorrowBalance
|
|
);
|
|
|
|
expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable.minus(
|
|
userDataBeforeAction.principalStableDebt
|
|
);
|
|
} else {
|
|
const debtAccrued = variableBorrowBalance.minus(userDataBeforeAction.principalVariableDebt);
|
|
|
|
expectedReserveData.totalLiquidity = reserveDataBeforeAction.totalLiquidity.plus(debtAccrued);
|
|
expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable.minus(
|
|
userDataBeforeAction.principalVariableDebt
|
|
);
|
|
|
|
expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable.plus(
|
|
variableBorrowBalance
|
|
);
|
|
expectedReserveData.averageStableBorrowRate = calcExpectedAverageStableBorrowRate(
|
|
reserveDataBeforeAction.averageStableBorrowRate,
|
|
reserveDataBeforeAction.totalBorrowsStable,
|
|
variableBorrowBalance,
|
|
reserveDataBeforeAction.stableBorrowRate
|
|
);
|
|
}
|
|
|
|
expectedReserveData.utilizationRate = calcExpectedUtilizationRate(
|
|
expectedReserveData.totalBorrowsStable,
|
|
expectedReserveData.totalBorrowsVariable,
|
|
expectedReserveData.totalLiquidity
|
|
);
|
|
|
|
const rates = calcExpectedInterestRates(
|
|
reserveDataBeforeAction.symbol,
|
|
reserveDataBeforeAction.marketStableRate,
|
|
expectedReserveData.utilizationRate,
|
|
expectedReserveData.totalBorrowsStable,
|
|
expectedReserveData.totalBorrowsVariable,
|
|
expectedReserveData.averageStableBorrowRate
|
|
);
|
|
expectedReserveData.liquidityRate = rates[0];
|
|
|
|
expectedReserveData.stableBorrowRate = rates[1];
|
|
|
|
expectedReserveData.variableBorrowRate = rates[2];
|
|
|
|
expectedReserveData.liquidityIndex = calcExpectedLiquidityIndex(
|
|
reserveDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
expectedReserveData.variableBorrowIndex = calcExpectedVariableBorrowIndex(
|
|
reserveDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
|
|
return expectedReserveData;
|
|
};
|
|
|
|
export const calcExpectedUserDataAfterSwapRateMode = (
|
|
reserveDataBeforeAction: ReserveData,
|
|
expectedDataAfterAction: ReserveData,
|
|
userDataBeforeAction: UserReserveData,
|
|
rateMode: string,
|
|
txCost: BigNumber,
|
|
txTimestamp: BigNumber
|
|
): UserReserveData => {
|
|
const expectedUserData = {...userDataBeforeAction};
|
|
|
|
const variableBorrowBalance = calcExpectedVariableDebtTokenBalance(
|
|
reserveDataBeforeAction,
|
|
userDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
|
|
const stableBorrowBalance = calcExpectedStableDebtTokenBalance(userDataBeforeAction, txTimestamp);
|
|
|
|
expectedUserData.currentATokenBalance = calcExpectedATokenBalance(
|
|
reserveDataBeforeAction,
|
|
userDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
|
|
if (rateMode === RateMode.Stable) {
|
|
// swap to variable
|
|
expectedUserData.currentStableDebt = expectedUserData.principalStableDebt = new BigNumber(0);
|
|
|
|
expectedUserData.stableBorrowRate = new BigNumber(0);
|
|
|
|
expectedUserData.principalVariableDebt = expectedUserData.currentVariableDebt = userDataBeforeAction.currentVariableDebt.plus(
|
|
stableBorrowBalance
|
|
);
|
|
expectedUserData.variableBorrowIndex = expectedDataAfterAction.variableBorrowIndex;
|
|
expectedUserData.stableRateLastUpdated = new BigNumber(0);
|
|
} else {
|
|
expectedUserData.principalStableDebt = expectedUserData.currentStableDebt = userDataBeforeAction.currentStableDebt.plus(
|
|
variableBorrowBalance
|
|
);
|
|
|
|
//weighted average of the previous and the current
|
|
expectedUserData.stableBorrowRate = calcExpectedUserStableRate(
|
|
userDataBeforeAction.principalStableDebt,
|
|
userDataBeforeAction.stableBorrowRate,
|
|
variableBorrowBalance,
|
|
reserveDataBeforeAction.stableBorrowRate
|
|
);
|
|
|
|
expectedUserData.stableRateLastUpdated = txTimestamp;
|
|
|
|
expectedUserData.currentVariableDebt = expectedUserData.principalVariableDebt = new BigNumber(
|
|
0
|
|
);
|
|
|
|
expectedUserData.variableBorrowIndex = new BigNumber(0);
|
|
}
|
|
|
|
expectedUserData.liquidityRate = expectedDataAfterAction.liquidityRate;
|
|
|
|
return expectedUserData;
|
|
};
|
|
|
|
export const calcExpectedReserveDataAfterStableRateRebalance = (
|
|
reserveDataBeforeAction: ReserveData,
|
|
userDataBeforeAction: UserReserveData,
|
|
txTimestamp: BigNumber
|
|
): ReserveData => {
|
|
const expectedReserveData: ReserveData = <ReserveData>{};
|
|
|
|
expectedReserveData.address = reserveDataBeforeAction.address;
|
|
|
|
const stableBorrowBalance = calcExpectedStableDebtTokenBalance(userDataBeforeAction, txTimestamp);
|
|
|
|
const debtAccrued = stableBorrowBalance.minus(userDataBeforeAction.principalStableDebt);
|
|
|
|
expectedReserveData.totalLiquidity = reserveDataBeforeAction.totalLiquidity.plus(debtAccrued);
|
|
|
|
expectedReserveData.availableLiquidity = reserveDataBeforeAction.availableLiquidity;
|
|
|
|
//removing the stable liquidity at the old rate
|
|
|
|
const avgRateBefore = calcExpectedAverageStableBorrowRate(
|
|
reserveDataBeforeAction.averageStableBorrowRate,
|
|
reserveDataBeforeAction.totalBorrowsStable.plus(debtAccrued),
|
|
stableBorrowBalance.negated(),
|
|
userDataBeforeAction.stableBorrowRate
|
|
);
|
|
// adding it again at the new rate
|
|
|
|
expectedReserveData.averageStableBorrowRate = calcExpectedAverageStableBorrowRate(
|
|
avgRateBefore,
|
|
reserveDataBeforeAction.totalBorrowsStable.minus(userDataBeforeAction.principalStableDebt),
|
|
stableBorrowBalance,
|
|
reserveDataBeforeAction.stableBorrowRate
|
|
);
|
|
|
|
expectedReserveData.totalBorrowsVariable = reserveDataBeforeAction.totalBorrowsVariable;
|
|
expectedReserveData.totalBorrowsStable = reserveDataBeforeAction.totalBorrowsStable.plus(
|
|
debtAccrued
|
|
);
|
|
|
|
expectedReserveData.utilizationRate = calcExpectedUtilizationRate(
|
|
expectedReserveData.totalBorrowsStable,
|
|
expectedReserveData.totalBorrowsVariable,
|
|
expectedReserveData.totalLiquidity
|
|
);
|
|
|
|
const rates = calcExpectedInterestRates(
|
|
reserveDataBeforeAction.symbol,
|
|
reserveDataBeforeAction.marketStableRate,
|
|
expectedReserveData.utilizationRate,
|
|
expectedReserveData.totalBorrowsStable,
|
|
expectedReserveData.totalBorrowsVariable,
|
|
expectedReserveData.averageStableBorrowRate
|
|
);
|
|
|
|
expectedReserveData.liquidityRate = rates[0];
|
|
|
|
expectedReserveData.stableBorrowRate = rates[1];
|
|
|
|
expectedReserveData.variableBorrowRate = rates[2];
|
|
|
|
expectedReserveData.liquidityIndex = calcExpectedLiquidityIndex(
|
|
reserveDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
expectedReserveData.variableBorrowIndex = calcExpectedVariableBorrowIndex(
|
|
reserveDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
|
|
return expectedReserveData;
|
|
};
|
|
|
|
export const calcExpectedUserDataAfterStableRateRebalance = (
|
|
reserveDataBeforeAction: ReserveData,
|
|
expectedDataAfterAction: ReserveData,
|
|
userDataBeforeAction: UserReserveData,
|
|
txCost: BigNumber,
|
|
txTimestamp: BigNumber
|
|
): UserReserveData => {
|
|
const expectedUserData = {...userDataBeforeAction};
|
|
|
|
expectedUserData.principalVariableDebt = calcExpectedVariableDebtTokenBalance(
|
|
reserveDataBeforeAction,
|
|
userDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
expectedUserData.currentStableDebt = expectedUserData.principalStableDebt = calcExpectedStableDebtTokenBalance(
|
|
userDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
|
|
expectedUserData.stableRateLastUpdated = txTimestamp;
|
|
|
|
expectedUserData.principalVariableDebt = userDataBeforeAction.principalVariableDebt;
|
|
|
|
expectedUserData.stableBorrowRate = reserveDataBeforeAction.stableBorrowRate;
|
|
|
|
expectedUserData.liquidityRate = expectedDataAfterAction.liquidityRate;
|
|
|
|
expectedUserData.currentATokenBalance = calcExpectedATokenBalance(
|
|
reserveDataBeforeAction,
|
|
userDataBeforeAction,
|
|
txTimestamp
|
|
);
|
|
|
|
return expectedUserData;
|
|
};
|
|
|
|
const calcExpectedScaledATokenBalance = (
|
|
userDataBeforeAction: UserReserveData,
|
|
index: BigNumber,
|
|
amountAdded: BigNumber,
|
|
amountTaken: BigNumber
|
|
) => {
|
|
return userDataBeforeAction.scaledATokenBalance
|
|
.plus(amountAdded.rayDiv(index))
|
|
.minus(amountTaken.rayDiv(index));
|
|
};
|
|
|
|
const calcExpectedATokenBalance = (
|
|
reserveDataBeforeAction: ReserveData,
|
|
userDataBeforeAction: UserReserveData,
|
|
currentTimestamp: BigNumber
|
|
) => {
|
|
const index = calcExpectedReserveNormalizedIncome(reserveDataBeforeAction, currentTimestamp);
|
|
|
|
const {
|
|
scaledATokenBalance: scaledBalanceBeforeAction,
|
|
} = userDataBeforeAction;
|
|
|
|
return scaledBalanceBeforeAction.rayMul(index);
|
|
};
|
|
|
|
const calcExpectedRedirectedBalance = (
|
|
expectedUserDataAfterAction: UserReserveData,
|
|
index: BigNumber,
|
|
redirectedBalanceBefore: BigNumber,
|
|
amountToAdd: BigNumber,
|
|
amountToSubstract: BigNumber
|
|
): BigNumber => {
|
|
return expectedUserDataAfterAction.interestRedirectionAddress !== ZERO_ADDRESS
|
|
? redirectedBalanceBefore.plus(amountToAdd.rayDiv(index)).minus(amountToSubstract.rayDiv(index))
|
|
: new BigNumber('0');
|
|
};
|
|
const calcExpectedAverageStableBorrowRate = (
|
|
avgStableRateBefore: BigNumber,
|
|
totalBorrowsStableBefore: BigNumber,
|
|
amountChanged: string | BigNumber,
|
|
rate: BigNumber
|
|
) => {
|
|
const weightedTotalBorrows = avgStableRateBefore.multipliedBy(totalBorrowsStableBefore);
|
|
const weightedAmountBorrowed = rate.multipliedBy(amountChanged);
|
|
const totalBorrowedStable = totalBorrowsStableBefore.plus(new BigNumber(amountChanged));
|
|
|
|
if (totalBorrowedStable.eq(0)) return new BigNumber('0');
|
|
|
|
return weightedTotalBorrows
|
|
.plus(weightedAmountBorrowed)
|
|
.div(totalBorrowedStable)
|
|
.decimalPlaces(0, BigNumber.ROUND_DOWN);
|
|
};
|
|
|
|
const calcExpectedVariableDebtUserIndex = (
|
|
reserveDataBeforeAction: ReserveData,
|
|
expectedUserBalanceAfterAction: BigNumber,
|
|
currentTimestamp: BigNumber
|
|
) => {
|
|
if (expectedUserBalanceAfterAction.eq(0)) {
|
|
return new BigNumber(0);
|
|
}
|
|
return calcExpectedReserveNormalizedDebt(reserveDataBeforeAction, currentTimestamp);
|
|
};
|
|
|
|
export const calcExpectedVariableDebtTokenBalance = (
|
|
reserveDataBeforeAction: ReserveData,
|
|
userDataBeforeAction: UserReserveData,
|
|
currentTimestamp: BigNumber
|
|
) => {
|
|
const debt = calcExpectedReserveNormalizedDebt(reserveDataBeforeAction, currentTimestamp);
|
|
|
|
const {principalVariableDebt, variableBorrowIndex} = userDataBeforeAction;
|
|
|
|
if (variableBorrowIndex.eq(0)) {
|
|
return principalVariableDebt;
|
|
}
|
|
|
|
return principalVariableDebt.wadToRay().rayMul(debt).rayDiv(variableBorrowIndex).rayToWad();
|
|
};
|
|
|
|
export const calcExpectedStableDebtTokenBalance = (
|
|
userDataBeforeAction: UserReserveData,
|
|
currentTimestamp: BigNumber
|
|
) => {
|
|
const {principalStableDebt, stableBorrowRate, stableRateLastUpdated} = userDataBeforeAction;
|
|
|
|
if (
|
|
stableBorrowRate.eq(0) ||
|
|
currentTimestamp.eq(stableRateLastUpdated) ||
|
|
stableRateLastUpdated.eq(0)
|
|
) {
|
|
return principalStableDebt;
|
|
}
|
|
|
|
const cumulatedInterest = calcCompoundedInterest(
|
|
stableBorrowRate,
|
|
currentTimestamp,
|
|
stableRateLastUpdated
|
|
);
|
|
|
|
return principalStableDebt.wadToRay().rayMul(cumulatedInterest).rayToWad();
|
|
};
|
|
|
|
const calcLinearInterest = (
|
|
rate: BigNumber,
|
|
currentTimestamp: BigNumber,
|
|
lastUpdateTimestamp: BigNumber
|
|
) => {
|
|
const timeDifference = currentTimestamp.minus(lastUpdateTimestamp).wadToRay();
|
|
|
|
const timeDelta = timeDifference.rayDiv(new BigNumber(ONE_YEAR).wadToRay());
|
|
|
|
const cumulatedInterest = rate.rayMul(timeDelta).plus(RAY);
|
|
|
|
return cumulatedInterest;
|
|
};
|
|
|
|
const calcCompoundedInterest = (
|
|
rate: BigNumber,
|
|
currentTimestamp: BigNumber,
|
|
lastUpdateTimestamp: BigNumber
|
|
) => {
|
|
const timeDifference = currentTimestamp.minus(lastUpdateTimestamp);
|
|
|
|
if (timeDifference.eq(0)) {
|
|
return new BigNumber(RAY);
|
|
}
|
|
|
|
const expMinusOne = timeDifference.minus(1);
|
|
const expMinusTwo = timeDifference.gt(2) ? timeDifference.minus(2) : 0;
|
|
|
|
const ratePerSecond = rate.div(ONE_YEAR);
|
|
|
|
const basePowerTwo = ratePerSecond.rayMul(ratePerSecond);
|
|
const basePowerThree = basePowerTwo.rayMul(ratePerSecond);
|
|
|
|
const secondTerm = timeDifference.times(expMinusOne).times(basePowerTwo).div(2);
|
|
const thirdTerm = timeDifference
|
|
.times(expMinusOne)
|
|
.times(expMinusTwo)
|
|
.times(basePowerThree)
|
|
.div(6);
|
|
|
|
return new BigNumber(RAY)
|
|
.plus(ratePerSecond.times(timeDifference))
|
|
.plus(secondTerm)
|
|
.plus(thirdTerm);
|
|
};
|
|
|
|
const calcExpectedInterestRates = (
|
|
reserveSymbol: string,
|
|
marketStableRate: BigNumber,
|
|
utilizationRate: BigNumber,
|
|
totalBorrowsStable: BigNumber,
|
|
totalBorrowsVariable: BigNumber,
|
|
averageStableBorrowRate: BigNumber
|
|
): BigNumber[] => {
|
|
const {reservesParams} = configuration;
|
|
|
|
const reserveIndex = Object.keys(reservesParams).findIndex((value) => value === reserveSymbol);
|
|
const [, reserveConfiguration] = (Object.entries(reservesParams) as [string, IReserveParams][])[
|
|
reserveIndex
|
|
];
|
|
|
|
let stableBorrowRate: BigNumber = marketStableRate;
|
|
let variableBorrowRate: BigNumber = new BigNumber(reserveConfiguration.baseVariableBorrowRate);
|
|
|
|
if (utilizationRate.gt(OPTIMAL_UTILIZATION_RATE)) {
|
|
const excessUtilizationRateRatio = utilizationRate
|
|
.minus(OPTIMAL_UTILIZATION_RATE)
|
|
.rayDiv(EXCESS_UTILIZATION_RATE);
|
|
|
|
stableBorrowRate = stableBorrowRate
|
|
.plus(reserveConfiguration.stableRateSlope1)
|
|
.plus(
|
|
new BigNumber(reserveConfiguration.stableRateSlope2).rayMul(excessUtilizationRateRatio)
|
|
);
|
|
|
|
variableBorrowRate = variableBorrowRate
|
|
.plus(reserveConfiguration.variableRateSlope1)
|
|
.plus(
|
|
new BigNumber(reserveConfiguration.variableRateSlope2).rayMul(excessUtilizationRateRatio)
|
|
);
|
|
} else {
|
|
stableBorrowRate = stableBorrowRate.plus(
|
|
new BigNumber(reserveConfiguration.stableRateSlope1).rayMul(
|
|
utilizationRate.rayDiv(new BigNumber(OPTIMAL_UTILIZATION_RATE))
|
|
)
|
|
);
|
|
|
|
variableBorrowRate = variableBorrowRate.plus(
|
|
utilizationRate
|
|
.rayDiv(OPTIMAL_UTILIZATION_RATE)
|
|
.rayMul(new BigNumber(reserveConfiguration.variableRateSlope1))
|
|
);
|
|
}
|
|
|
|
const expectedOverallRate = calcExpectedOverallBorrowRate(
|
|
totalBorrowsStable,
|
|
totalBorrowsVariable,
|
|
variableBorrowRate,
|
|
averageStableBorrowRate
|
|
);
|
|
const liquidityRate = expectedOverallRate.rayMul(utilizationRate);
|
|
|
|
return [liquidityRate, stableBorrowRate, variableBorrowRate];
|
|
};
|
|
|
|
const calcExpectedOverallBorrowRate = (
|
|
totalBorrowsStable: BigNumber,
|
|
totalBorrowsVariable: BigNumber,
|
|
currentVariableBorrowRate: BigNumber,
|
|
currentAverageStableBorrowRate: BigNumber
|
|
): BigNumber => {
|
|
const totalBorrows = totalBorrowsStable.plus(totalBorrowsVariable);
|
|
|
|
if (totalBorrows.eq(0)) return strToBN('0');
|
|
|
|
const weightedVariableRate = totalBorrowsVariable.wadToRay().rayMul(currentVariableBorrowRate);
|
|
|
|
const weightedStableRate = totalBorrowsStable.wadToRay().rayMul(currentAverageStableBorrowRate);
|
|
|
|
const overallBorrowRate = weightedVariableRate
|
|
.plus(weightedStableRate)
|
|
.rayDiv(totalBorrows.wadToRay());
|
|
|
|
return overallBorrowRate;
|
|
};
|
|
|
|
const calcExpectedUtilizationRate = (
|
|
totalBorrowsStable: BigNumber,
|
|
totalBorrowsVariable: BigNumber,
|
|
totalLiquidity: BigNumber
|
|
): BigNumber => {
|
|
if (totalBorrowsStable.eq('0') && totalBorrowsVariable.eq('0')) {
|
|
return strToBN('0');
|
|
}
|
|
|
|
const utilization = totalBorrowsStable.plus(totalBorrowsVariable).rayDiv(totalLiquidity);
|
|
|
|
return utilization;
|
|
};
|
|
|
|
const calcExpectedReserveNormalizedIncome = (
|
|
reserveData: ReserveData,
|
|
currentTimestamp: BigNumber
|
|
) => {
|
|
const {liquidityRate, liquidityIndex, lastUpdateTimestamp} = reserveData;
|
|
|
|
//if utilization rate is 0, nothing to compound
|
|
if (liquidityRate.eq('0')) {
|
|
return liquidityIndex;
|
|
}
|
|
|
|
const cumulatedInterest = calcLinearInterest(
|
|
liquidityRate,
|
|
currentTimestamp,
|
|
lastUpdateTimestamp
|
|
);
|
|
|
|
const income = cumulatedInterest.rayMul(liquidityIndex);
|
|
|
|
return income;
|
|
};
|
|
|
|
const calcExpectedReserveNormalizedDebt = (
|
|
reserveData: ReserveData,
|
|
currentTimestamp: BigNumber
|
|
) => {
|
|
const {variableBorrowRate, variableBorrowIndex, lastUpdateTimestamp} = reserveData;
|
|
|
|
//if utilization rate is 0, nothing to compound
|
|
if (variableBorrowRate.eq('0')) {
|
|
return variableBorrowIndex;
|
|
}
|
|
|
|
const cumulatedInterest = calcCompoundedInterest(
|
|
variableBorrowRate,
|
|
currentTimestamp,
|
|
lastUpdateTimestamp
|
|
);
|
|
|
|
const debt = cumulatedInterest.rayMul(variableBorrowIndex);
|
|
|
|
return debt;
|
|
};
|
|
|
|
const calcExpectedUserStableRate = (
|
|
balanceBefore: BigNumber,
|
|
rateBefore: BigNumber,
|
|
amount: BigNumber,
|
|
rateNew: BigNumber
|
|
) => {
|
|
return balanceBefore
|
|
.times(rateBefore)
|
|
.plus(amount.times(rateNew))
|
|
.div(balanceBefore.plus(amount));
|
|
};
|
|
|
|
const calcExpectedLiquidityIndex = (reserveData: ReserveData, timestamp: BigNumber) => {
|
|
//if utilization rate is 0, nothing to compound
|
|
if (reserveData.utilizationRate.eq('0')) {
|
|
return reserveData.liquidityIndex;
|
|
}
|
|
|
|
const cumulatedInterest = calcLinearInterest(
|
|
reserveData.liquidityRate,
|
|
timestamp,
|
|
reserveData.lastUpdateTimestamp
|
|
);
|
|
|
|
return cumulatedInterest.rayMul(reserveData.liquidityIndex);
|
|
};
|
|
|
|
const calcExpectedVariableBorrowIndex = (reserveData: ReserveData, timestamp: BigNumber) => {
|
|
//if totalBorrowsVariable is 0, nothing to compound
|
|
if (reserveData.totalBorrowsVariable.eq('0')) {
|
|
return reserveData.variableBorrowIndex;
|
|
}
|
|
|
|
const cumulatedInterest = calcCompoundedInterest(
|
|
reserveData.variableBorrowRate,
|
|
timestamp,
|
|
reserveData.lastUpdateTimestamp
|
|
);
|
|
|
|
return cumulatedInterest.rayMul(reserveData.variableBorrowIndex);
|
|
};
|