import {TestEnv, makeSuite} from './helpers/make-suite'; import {APPROVAL_AMOUNT_LENDING_POOL, oneEther} from '../helpers/constants'; import {ethers} from 'ethers'; import BigNumber from 'bignumber.js'; import { calcExpectedVariableDebtTokenBalance, calcExpectedStableDebtTokenBalance, } from './helpers/utils/calculations'; import {getContractsData} from './helpers/actions'; import {waitForTx} from './__setup.spec'; import {timeLatest} from '../helpers/misc-utils'; import {tEthereumAddress, ProtocolErrors} from '../helpers/types'; import {convertToCurrencyDecimals} from '../helpers/contracts-helpers'; const {expect} = require('chai'); const {parseUnits, parseEther} = ethers.utils; const expectRepayWithCollateralEvent = ( events: ethers.Event[], pool: tEthereumAddress, collateral: tEthereumAddress, borrowing: tEthereumAddress, user: tEthereumAddress ) => { if (!events || events.length < 14) { expect(false, 'INVALID_EVENTS_LENGTH_ON_REPAY_COLLATERAL'); } const repayWithCollateralEvent = events[13]; expect(repayWithCollateralEvent.address).to.be.equal(pool); expect(`0x${repayWithCollateralEvent.topics[1].slice(26)}`.toLowerCase()).to.be.equal( collateral.toLowerCase() ); expect(`0x${repayWithCollateralEvent.topics[2].slice(26)}`).to.be.equal(borrowing.toLowerCase()); expect(`0x${repayWithCollateralEvent.topics[3].slice(26)}`.toLowerCase()).to.be.equal( user.toLowerCase() ); }; makeSuite('LendingPool. repayWithCollateral() with liquidator', (testEnv: TestEnv) => { const {INVALID_HF} = ProtocolErrors; it('User 1 provides some liquidity for others to borrow', async () => { const {pool, weth, dai, usdc} = testEnv; await weth.mint(parseEther('200')); await weth.approve(pool.address, parseEther('200')); await pool.deposit(weth.address, parseEther('200'), 0); await dai.mint(parseEther('20000')); await dai.approve(pool.address, parseEther('20000')); await pool.deposit(dai.address, parseEther('20000'), 0); await usdc.mint(parseEther('20000')); await usdc.approve(pool.address, parseEther('20000')); await pool.deposit(usdc.address, parseEther('20000'), 0); }); it('User 5 liquidate User 3 collateral, all his variable debt and part of the stable', async () => { const {pool, weth, usdc, users, mockSwapAdapter, oracle} = testEnv; const user = users[2]; const liquidator = users[4]; const amountToDeposit = parseEther('20'); const amountToBorrow = parseUnits('40', 6); await weth.connect(user.signer).mint(amountToDeposit); await weth.connect(user.signer).approve(pool.address, amountToDeposit); await pool.connect(user.signer).deposit(weth.address, amountToDeposit, '0'); const usdcPrice = await oracle.getAssetPrice(usdc.address); await pool.connect(user.signer).borrow(usdc.address, amountToBorrow, 2, 0); await pool.connect(user.signer).borrow(usdc.address, amountToBorrow, 1, 0); const {userData: wethUserDataBefore} = await getContractsData( weth.address, user.address, testEnv ); const { reserveData: usdcReserveDataBefore, userData: usdcUserDataBefore, } = await getContractsData(usdc.address, user.address, testEnv); // Set HF below 1 await oracle.setAssetPrice( usdc.address, new BigNumber(usdcPrice.toString()).multipliedBy(60).toFixed(0) ); const userGlobalDataPrior = await pool.getUserAccountData(user.address); expect(userGlobalDataPrior.healthFactor.toString()).to.be.bignumber.lt(oneEther, INVALID_HF); const amountToRepay = parseUnits('80', 6); await mockSwapAdapter.setAmountToReturn(amountToRepay); const txReceipt = await waitForTx( await pool .connect(liquidator.signer) .repayWithCollateral( weth.address, usdc.address, user.address, amountToRepay, mockSwapAdapter.address, '0x' ) ); const repayWithCollateralTimestamp = await timeLatest(); const {userData: wethUserDataAfter} = await getContractsData( weth.address, user.address, testEnv ); const {userData: usdcUserDataAfter} = await getContractsData( usdc.address, user.address, testEnv ); const collateralPrice = await oracle.getAssetPrice(weth.address); const principalPrice = await oracle.getAssetPrice(usdc.address); const collateralDecimals = ( await pool.getReserveConfigurationData(weth.address) ).decimals.toString(); const principalDecimals = ( await pool.getReserveConfigurationData(usdc.address) ).decimals.toString(); const expectedCollateralLiquidated = new BigNumber(principalPrice.toString()) .times(new BigNumber(amountToRepay.toString()).times(105)) .times(new BigNumber(10).pow(collateralDecimals)) .div( new BigNumber(collateralPrice.toString()).times(new BigNumber(10).pow(principalDecimals)) ) .div(100) .decimalPlaces(0, BigNumber.ROUND_DOWN); const expectedVariableDebtIncrease = calcExpectedVariableDebtTokenBalance( usdcReserveDataBefore, usdcUserDataBefore, new BigNumber(repayWithCollateralTimestamp) ).minus(usdcUserDataBefore.currentVariableDebt); const expectedStableDebtIncrease = calcExpectedStableDebtTokenBalance( usdcUserDataBefore, new BigNumber(repayWithCollateralTimestamp) ).minus(usdcUserDataBefore.currentStableDebt); expect(usdcUserDataAfter.currentVariableDebt).to.be.bignumber.equal( new BigNumber(usdcUserDataBefore.currentVariableDebt) .minus(amountToRepay.toString()) .plus(expectedVariableDebtIncrease) .gte(0) ? new BigNumber(usdcUserDataBefore.currentVariableDebt) .minus(amountToRepay.toString()) .plus(expectedVariableDebtIncrease) .toString() : '0', 'INVALID_VARIABLE_DEBT_POSITION' ); const stableDebtRepaid = new BigNumber(usdcUserDataBefore.currentVariableDebt) .minus(amountToRepay.toString()) .plus(expectedVariableDebtIncrease) .abs(); expect(usdcUserDataAfter.currentStableDebt).to.be.bignumber.equal( new BigNumber(usdcUserDataBefore.currentStableDebt) .minus(stableDebtRepaid) .plus(expectedStableDebtIncrease) .gte(0) ? new BigNumber(usdcUserDataBefore.currentStableDebt) .minus(stableDebtRepaid) .plus(expectedStableDebtIncrease) .toString() : '0', 'INVALID_STABLE_DEBT_POSITION' ); expect(wethUserDataAfter.currentATokenBalance).to.be.bignumber.equal( new BigNumber(wethUserDataBefore.currentATokenBalance).minus( expectedCollateralLiquidated.toString() ), 'INVALID_COLLATERAL_POSITION' ); const eventsEmitted = txReceipt.events || []; expectRepayWithCollateralEvent( eventsEmitted, pool.address, weth.address, usdc.address, user.address ); // Resets USDC Price await oracle.setAssetPrice(usdc.address, usdcPrice); }); it('User 3 deposits WETH and borrows USDC at Variable', async () => { const {pool, weth, usdc, users, oracle} = testEnv; const user = users[2]; const amountToDeposit = parseEther('10'); await weth.connect(user.signer).mint(amountToDeposit); await weth.connect(user.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL); await pool.connect(user.signer).deposit(weth.address, amountToDeposit, '0'); const userGlobalData = await pool.getUserAccountData(user.address); const usdcPrice = await oracle.getAssetPrice(usdc.address); const amountUSDCToBorrow = await convertToCurrencyDecimals( usdc.address, new BigNumber(userGlobalData.availableBorrowsETH.toString()) .div(usdcPrice.toString()) .multipliedBy(0.95) .toFixed(0) ); await pool.connect(user.signer).borrow(usdc.address, amountUSDCToBorrow, 2, 0); }); it('User 5 liquidates half the USDC loan of User 3 by swapping his WETH collateral', async () => { const {pool, weth, usdc, users, mockSwapAdapter, oracle} = testEnv; const user = users[2]; const liquidator = users[4]; // Sets USDC Price higher to decrease health factor below 1 const usdcPrice = await oracle.getAssetPrice(usdc.address); await oracle.setAssetPrice( usdc.address, new BigNumber(usdcPrice.toString()).multipliedBy(1.15).toFixed(0) ); const userGlobalData = await pool.getUserAccountData(user.address); expect(userGlobalData.healthFactor.toString()).to.be.bignumber.lt(oneEther, INVALID_HF); const {userData: wethUserDataBefore} = await getContractsData( weth.address, user.address, testEnv ); const { reserveData: usdcReserveDataBefore, userData: usdcUserDataBefore, } = await getContractsData(usdc.address, user.address, testEnv); const amountToRepay = usdcReserveDataBefore.totalBorrowsVariable.dividedBy(2).toFixed(0); await mockSwapAdapter.setAmountToReturn(amountToRepay); await waitForTx( await pool .connect(liquidator.signer) .repayWithCollateral( weth.address, usdc.address, user.address, amountToRepay, mockSwapAdapter.address, '0x' ) ); const repayWithCollateralTimestamp = await timeLatest(); const {userData: wethUserDataAfter} = await getContractsData( weth.address, user.address, testEnv ); const {userData: usdcUserDataAfter} = await getContractsData( usdc.address, user.address, testEnv ); const collateralPrice = await oracle.getAssetPrice(weth.address); const principalPrice = await oracle.getAssetPrice(usdc.address); const collateralDecimals = ( await pool.getReserveConfigurationData(weth.address) ).decimals.toString(); const principalDecimals = ( await pool.getReserveConfigurationData(usdc.address) ).decimals.toString(); const expectedCollateralLiquidated = new BigNumber(principalPrice.toString()) .times(new BigNumber(amountToRepay.toString()).times(105)) .times(new BigNumber(10).pow(collateralDecimals)) .div( new BigNumber(collateralPrice.toString()).times(new BigNumber(10).pow(principalDecimals)) ) .div(100) .decimalPlaces(0, BigNumber.ROUND_DOWN); const expectedVariableDebtIncrease = calcExpectedVariableDebtTokenBalance( usdcReserveDataBefore, usdcUserDataBefore, new BigNumber(repayWithCollateralTimestamp) ).minus(usdcUserDataBefore.currentVariableDebt); expect(usdcUserDataAfter.currentVariableDebt).to.be.bignumber.almostEqual( new BigNumber(usdcUserDataBefore.currentVariableDebt) .minus(amountToRepay.toString()) .plus(expectedVariableDebtIncrease) .toString(), 'INVALID_DEBT_POSITION' ); expect(wethUserDataAfter.currentATokenBalance).to.be.bignumber.equal( new BigNumber(wethUserDataBefore.currentATokenBalance).minus( expectedCollateralLiquidated.toString() ), 'INVALID_COLLATERAL_POSITION' ); // Resets USDC Price await oracle.setAssetPrice(usdc.address, usdcPrice); }); it('Revert expected. User 5 tries to liquidate an User 3 collateral a currency he havent borrow', async () => { const {pool, weth, dai, users, oracle, mockSwapAdapter, usdc} = testEnv; const user = users[2]; const liquidator = users[4]; const amountToRepay = parseUnits('10', 6); // Sets USDC Price higher to decrease health factor below 1 const usdcPrice = await oracle.getAssetPrice(usdc.address); await oracle.setAssetPrice( usdc.address, new BigNumber(usdcPrice.toString()).multipliedBy(6.4).toFixed(0) ); const userGlobalData = await pool.getUserAccountData(user.address); expect(userGlobalData.healthFactor.toString()).to.be.bignumber.lt(oneEther, INVALID_HF); await expect( pool .connect(liquidator.signer) .repayWithCollateral( weth.address, dai.address, user.address, amountToRepay, mockSwapAdapter.address, '0x' ) ).to.be.revertedWith('revert CURRRENCY_NOT_BORROWED'); await oracle.setAssetPrice(usdc.address, usdcPrice); }); it('User 2 deposit WETH and borrows DAI at Variable', async () => { const {pool, weth, dai, users, oracle} = testEnv; const user = users[1]; const amountToDeposit = ethers.utils.parseEther('1'); await weth.connect(user.signer).mint(amountToDeposit); await weth.connect(user.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL); await pool.connect(user.signer).deposit(weth.address, amountToDeposit, '0'); const userGlobalData = await pool.getUserAccountData(user.address); const daiPrice = await oracle.getAssetPrice(dai.address); const amountDAIToBorrow = await convertToCurrencyDecimals( dai.address, new BigNumber(userGlobalData.availableBorrowsETH.toString()) .div(daiPrice.toString()) .multipliedBy(0.95) .toFixed(0) ); await pool.connect(user.signer).borrow(dai.address, amountDAIToBorrow, 2, 0); }); it('User 5 tries to liquidate User 2 DAI Variable loan using his WETH collateral, with good HF', async () => { const {pool, weth, dai, users, mockSwapAdapter} = testEnv; const user = users[1]; const liquidator = users[4]; const {reserveData: daiReserveDataBefore} = await getContractsData( dai.address, user.address, testEnv ); // First half const amountToRepay = daiReserveDataBefore.totalBorrowsVariable.dividedBy(2).toString(); await mockSwapAdapter.setAmountToReturn(amountToRepay); await expect( pool .connect(liquidator.signer) .repayWithCollateral( weth.address, dai.address, user.address, amountToRepay, mockSwapAdapter.address, '0x' ) ).to.be.revertedWith('HEALTH_FACTOR_ABOVE_THRESHOLD'); }); it('User 5 liquidates User 2 DAI Variable loan using his WETH collateral, half the amount', async () => { const {pool, weth, dai, users, mockSwapAdapter, oracle} = testEnv; const user = users[1]; const liquidator = users[4]; // Sets DAI Price higher to decrease health factor below 1 const daiPrice = await oracle.getAssetPrice(dai.address); await oracle.setAssetPrice( dai.address, new BigNumber(daiPrice.toString()).multipliedBy(1.4).toFixed(0) ); const userGlobalData = await pool.getUserAccountData(user.address); expect(userGlobalData.healthFactor.toString()).to.be.bignumber.lt(oneEther, INVALID_HF); const {userData: wethUserDataBefore} = await getContractsData( weth.address, user.address, testEnv ); const {reserveData: daiReserveDataBefore, userData: daiUserDataBefore} = await getContractsData( dai.address, user.address, testEnv ); // First half const amountToRepay = daiReserveDataBefore.totalBorrowsVariable.dividedBy(2).toString(); await mockSwapAdapter.setAmountToReturn(amountToRepay); await waitForTx( await pool .connect(liquidator.signer) .repayWithCollateral( weth.address, dai.address, user.address, amountToRepay, mockSwapAdapter.address, '0x' ) ); const repayWithCollateralTimestamp = await timeLatest(); const {userData: wethUserDataAfter} = await getContractsData( weth.address, user.address, testEnv ); const {userData: daiUserDataAfter} = await getContractsData(dai.address, user.address, testEnv); const collateralPrice = await oracle.getAssetPrice(weth.address); const principalPrice = await oracle.getAssetPrice(dai.address); const collateralDecimals = ( await pool.getReserveConfigurationData(weth.address) ).decimals.toString(); const principalDecimals = ( await pool.getReserveConfigurationData(dai.address) ).decimals.toString(); const expectedCollateralLiquidated = new BigNumber(principalPrice.toString()) .times(new BigNumber(amountToRepay.toString()).times(105)) .times(new BigNumber(10).pow(collateralDecimals)) .div( new BigNumber(collateralPrice.toString()).times(new BigNumber(10).pow(principalDecimals)) ) .div(100) .decimalPlaces(0, BigNumber.ROUND_DOWN); const expectedVariableDebtIncrease = calcExpectedVariableDebtTokenBalance( daiReserveDataBefore, daiUserDataBefore, new BigNumber(repayWithCollateralTimestamp) ).minus(daiUserDataBefore.currentVariableDebt); expect(daiUserDataAfter.currentVariableDebt).to.be.bignumber.almostEqual( new BigNumber(daiUserDataBefore.currentVariableDebt) .minus(amountToRepay.toString()) .plus(expectedVariableDebtIncrease) .toString() ); expect(wethUserDataAfter.currentATokenBalance).to.be.bignumber.equal( new BigNumber(wethUserDataBefore.currentATokenBalance).minus( expectedCollateralLiquidated.toString() ) ); // Resets DAI price await oracle.setAssetPrice(dai.address, daiPrice); }); it('User 2 tries to repay remaining DAI Variable loan using his WETH collateral', async () => { const {pool, weth, dai, users, mockSwapAdapter, oracle} = testEnv; const user = users[1]; const {userData: wethUserDataBefore} = await getContractsData( weth.address, user.address, testEnv ); const {reserveData: daiReserveDataBefore, userData: daiUserDataBefore} = await getContractsData( dai.address, user.address, testEnv ); // Repay the remaining DAI const amountToRepay = daiReserveDataBefore.totalBorrowsVariable.toString(); await mockSwapAdapter.setAmountToReturn(amountToRepay); await waitForTx( await pool .connect(user.signer) .repayWithCollateral( weth.address, dai.address, user.address, amountToRepay, mockSwapAdapter.address, '0x' ) ); const repayWithCollateralTimestamp = await timeLatest(); const {userData: wethUserDataAfter} = await getContractsData( weth.address, user.address, testEnv ); const {userData: daiUserDataAfter} = await getContractsData(dai.address, user.address, testEnv); const collateralPrice = await oracle.getAssetPrice(weth.address); const principalPrice = await oracle.getAssetPrice(dai.address); const collateralDecimals = ( await pool.getReserveConfigurationData(weth.address) ).decimals.toString(); const principalDecimals = ( await pool.getReserveConfigurationData(dai.address) ).decimals.toString(); const expectedCollateralLiquidated = new BigNumber(principalPrice.toString()) .times(new BigNumber(amountToRepay.toString()).times(105)) .times(new BigNumber(10).pow(collateralDecimals)) .div( new BigNumber(collateralPrice.toString()).times(new BigNumber(10).pow(principalDecimals)) ) .div(100) .decimalPlaces(0, BigNumber.ROUND_DOWN); const expectedVariableDebtIncrease = calcExpectedVariableDebtTokenBalance( daiReserveDataBefore, daiUserDataBefore, new BigNumber(repayWithCollateralTimestamp) ).minus(daiUserDataBefore.currentVariableDebt); expect(daiUserDataAfter.currentVariableDebt).to.be.bignumber.almostEqual( new BigNumber(daiUserDataBefore.currentVariableDebt) .minus(amountToRepay.toString()) .plus(expectedVariableDebtIncrease) .toString() ); expect(wethUserDataAfter.currentATokenBalance).to.be.bignumber.equal( new BigNumber(wethUserDataBefore.currentATokenBalance).minus( expectedCollateralLiquidated.toString() ) ); }); it.skip('WIP Liquidator tries to repay 4 user a bigger amount that what can be swapped of a particular collateral, repaying only the maximum allowed by that collateral', async () => { const {pool, weth, dai, users, mockSwapAdapter, oracle} = testEnv; const user = users[3]; const liquidator = users[5]; const amountToDepositWeth = parseEther('0.1'); const amountToDepositDAI = parseEther('500'); const amountToBorrowVariable = parseEther('80'); await weth.connect(user.signer).mint(amountToDepositWeth); await dai.connect(user.signer).mint(amountToDepositDAI); await weth.connect(user.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL); await dai.connect(user.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL); await pool.connect(user.signer).deposit(weth.address, amountToDepositWeth, '0'); await pool.connect(user.signer).deposit(dai.address, amountToDepositDAI, '0'); await pool.connect(user.signer).borrow(dai.address, amountToBorrowVariable, 2, 0); const amountToRepay = parseEther('80'); const {userData: wethUserDataBefore} = await getContractsData( weth.address, user.address, testEnv ); const {reserveData: daiReserveDataBefore, userData: daiUserDataBefore} = await getContractsData( dai.address, user.address, testEnv ); const wethPrice = await oracle.getAssetPrice(weth.address); // Set HF below 1 await oracle.setAssetPrice( weth.address, new BigNumber(wethPrice.toString()).multipliedBy(0.1).toFixed(0) ); const userGlobalDataPrior = await pool.getUserAccountData(user.address); expect(userGlobalDataPrior.healthFactor.toString()).to.be.bignumber.lt(oneEther, INVALID_HF); await mockSwapAdapter.setAmountToReturn(amountToRepay); await waitForTx( await pool .connect(liquidator.signer) .repayWithCollateral( weth.address, dai.address, user.address, amountToRepay, mockSwapAdapter.address, '0x' ) ); const repayWithCollateralTimestamp = await timeLatest(); const {userData: wethUserDataAfter} = await getContractsData( weth.address, user.address, testEnv ); const {userData: daiUserDataAfter} = await getContractsData(dai.address, user.address, testEnv); const collateralPrice = await oracle.getAssetPrice(weth.address); const principalPrice = await oracle.getAssetPrice(dai.address); const collateralConfig = await pool.getReserveConfigurationData(weth.address); const collateralDecimals = collateralConfig.decimals.toString(); const principalDecimals = ( await pool.getReserveConfigurationData(dai.address) ).decimals.toString(); const collateralLiquidationBonus = collateralConfig.liquidationBonus.toString(); const expectedDebtCovered = new BigNumber(collateralPrice.toString()) .times(new BigNumber(wethUserDataBefore.currentATokenBalance.toString())) .times(new BigNumber(10).pow(principalDecimals)) .div( new BigNumber(principalPrice.toString()).times(new BigNumber(10).pow(collateralDecimals)) ) .div(new BigNumber(collateralLiquidationBonus).div(10000).toString()) .decimalPlaces(0, BigNumber.ROUND_DOWN); const expectedVariableDebtIncrease = calcExpectedVariableDebtTokenBalance( daiReserveDataBefore, daiUserDataBefore, new BigNumber(repayWithCollateralTimestamp) ).minus(daiUserDataBefore.currentVariableDebt); expect(daiUserDataAfter.currentVariableDebt).to.be.bignumber.equal( new BigNumber(daiUserDataBefore.currentVariableDebt) .minus(expectedDebtCovered.toString()) .plus(expectedVariableDebtIncrease), 'INVALID_VARIABLE_DEBT_POSITION' ); expect(wethUserDataAfter.currentATokenBalance).to.be.bignumber.equal(0); // Resets WETH Price await oracle.setAssetPrice(weth.address, wethPrice); }); });