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Merge branch 'master' into feat/uniswap-adapter-flashloan

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This commit is contained in:
Gerardo Nardelli 2020-11-10 16:28:01 -03:00
commit 37a2f14fca
11 changed files with 237 additions and 172 deletions
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114
contracts/lendingpool/LendingPool.sol
View File

@ -25,7 +25,7 @@ import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol';
import {SafeERC20} from '../dependencies/openzeppelin/contracts/SafeERC20.sol';
import {ILendingPool} from '../interfaces/ILendingPool.sol';
import {LendingPoolStorage} from './LendingPoolStorage.sol';
import {IReserveInterestRateStrategy} from '../interfaces/IReserveInterestRateStrategy.sol';
import {Address} from '../dependencies/openzeppelin/contracts/Address.sol';
/**
* @title LendingPool contract
@ -39,13 +39,27 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
using SafeERC20 for IERC20;
//main configuration parameters
uint256 public constant REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD = 4000;
uint256 public constant REBALANCE_UP_USAGE_RATIO_THRESHOLD = 0.95 * 1e27; //usage ratio of 95%
uint256 public constant MAX_STABLE_RATE_BORROW_SIZE_PERCENT = 2500;
uint256 public constant FLASHLOAN_PREMIUM_TOTAL = 9;
uint256 public constant MAX_NUMBER_RESERVES = 128;
uint256 public constant LENDINGPOOL_REVISION = 0x2;
/**
* @dev functions marked by this modifier can only be called when the protocol is not paused
**/
modifier whenNotPaused() {
_whenNotPaused();
_;
}
/**
* @dev functions marked by this modifier can only be called by the LendingPoolConfigurator
**/
modifier onlyLendingPoolConfigurator() {
_onlyLendingPoolConfigurator();
_;
}
/**
* @dev only lending pools configurator can use functions affected by this modifier
**/
@ -92,8 +106,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
uint256 amount,
address onBehalfOf,
uint16 referralCode
) external override {
_whenNotPaused();
) external override whenNotPaused {
ReserveLogic.ReserveData storage reserve = _reserves[asset];
ValidationLogic.validateDeposit(reserve, amount);
@ -126,8 +139,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
address asset,
uint256 amount,
address to
) external override {
_whenNotPaused();
) external override whenNotPaused {
ReserveLogic.ReserveData storage reserve = _reserves[asset];
address aToken = reserve.aTokenAddress;
@ -181,8 +193,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
uint256 interestRateMode,
uint16 referralCode,
address onBehalfOf
) external override {
_whenNotPaused();
) external override whenNotPaused {
ReserveLogic.ReserveData storage reserve = _reserves[asset];
_executeBorrow(
@ -212,9 +223,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
uint256 amount,
uint256 rateMode,
address onBehalfOf
) external override {
_whenNotPaused();
) external override whenNotPaused {
ReserveLogic.ReserveData storage reserve = _reserves[asset];
(uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(onBehalfOf, reserve);
@ -269,8 +278,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
* @param asset the address of the reserve on which the user borrowed
* @param rateMode the rate mode that the user wants to swap
**/
function swapBorrowRateMode(address asset, uint256 rateMode) external override {
_whenNotPaused();
function swapBorrowRateMode(address asset, uint256 rateMode) external override whenNotPaused {
ReserveLogic.ReserveData storage reserve = _reserves[asset];
(uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(msg.sender, reserve);
@ -324,51 +332,30 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
* @param asset the address of the reserve
* @param user the address of the user to be rebalanced
**/
function rebalanceStableBorrowRate(address asset, address user) external override {
_whenNotPaused();
function rebalanceStableBorrowRate(address asset, address user) external override whenNotPaused {
ReserveLogic.ReserveData storage reserve = _reserves[asset];
IERC20 stableDebtToken = IERC20(reserve.stableDebtTokenAddress);
IERC20 variableDebtToken = IERC20(reserve.variableDebtTokenAddress);
address aTokenAddress = reserve.aTokenAddress;
uint256 stableBorrowBalance = IERC20(stableDebtToken).balanceOf(user);
uint256 stableDebt = IERC20(stableDebtToken).balanceOf(user);
//if the usage ratio is below 95%, no rebalances are needed
uint256 totalBorrows = stableDebtToken
.totalSupply()
.add(variableDebtToken.totalSupply())
.wadToRay();
uint256 availableLiquidity = IERC20(asset).balanceOf(aTokenAddress).wadToRay();
uint256 usageRatio = totalBorrows == 0
? 0
: totalBorrows.rayDiv(availableLiquidity.add(totalBorrows));
//if the liquidity rate is below REBALANCE_UP_THRESHOLD of the max variable APR at 95% usage,
//then we allow rebalancing of the stable rate positions.
uint256 currentLiquidityRate = reserve.currentLiquidityRate;
uint256 maxVariableBorrowRate = IReserveInterestRateStrategy(
reserve
.interestRateStrategyAddress
)
.getMaxVariableBorrowRate();
require(
usageRatio >= REBALANCE_UP_USAGE_RATIO_THRESHOLD &&
currentLiquidityRate <=
maxVariableBorrowRate.percentMul(REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD),
Errors.LP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET
ValidationLogic.validateRebalanceStableBorrowRate(
reserve,
asset,
stableDebtToken,
variableDebtToken,
aTokenAddress
);
reserve.updateState();
IStableDebtToken(address(stableDebtToken)).burn(user, stableBorrowBalance);
IStableDebtToken(address(stableDebtToken)).burn(user, stableDebt);
IStableDebtToken(address(stableDebtToken)).mint(
user,
user,
stableBorrowBalance,
stableDebt,
reserve.currentStableBorrowRate
);
@ -382,8 +369,11 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
* @param asset the address of the reserve
* @param useAsCollateral true if the user wants to use the deposit as collateral, false otherwise.
**/
function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external override {
_whenNotPaused();
function setUserUseReserveAsCollateral(address asset, bool useAsCollateral)
external
override
whenNotPaused
{
ReserveLogic.ReserveData storage reserve = _reserves[asset];
ValidationLogic.validateSetUseReserveAsCollateral(
@ -421,8 +411,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
address user,
uint256 purchaseAmount,
bool receiveAToken
) external override {
_whenNotPaused();
) external override whenNotPaused {
address collateralManager = _addressesProvider.getLendingPoolCollateralManager();
//solium-disable-next-line
@ -478,9 +467,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
address onBehalfOf,
bytes calldata params,
uint16 referralCode
) external override {
_whenNotPaused();
) external override whenNotPaused {
FlashLoanLocalVars memory vars;
ValidationLogic.validateFlashloan(assets, amounts);
@ -715,9 +702,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
uint256 amount,
uint256 balanceFromBefore,
uint256 balanceToBefore
) external override {
_whenNotPaused();
) external override whenNotPaused {
require(msg.sender == _reserves[asset].aTokenAddress, Errors.LP_CALLER_MUST_BE_AN_ATOKEN);
ValidationLogic.validateTransfer(
@ -765,8 +750,8 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
address stableDebtAddress,
address variableDebtAddress,
address interestRateStrategyAddress
) external override {
_onlyLendingPoolConfigurator();
) external override onlyLendingPoolConfigurator {
require(Address.isContract(asset), Errors.LP_NOT_CONTRACT);
_reserves[asset].init(
aTokenAddress,
stableDebtAddress,
@ -784,8 +769,8 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
function setReserveInterestRateStrategyAddress(address asset, address rateStrategyAddress)
external
override
onlyLendingPoolConfigurator
{
_onlyLendingPoolConfigurator();
_reserves[asset].interestRateStrategyAddress = rateStrategyAddress;
}
@ -794,8 +779,11 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
* @param asset the address of the reserve
* @param configuration the configuration map
**/
function setConfiguration(address asset, uint256 configuration) external override {
_onlyLendingPoolConfigurator();
function setConfiguration(address asset, uint256 configuration)
external
override
onlyLendingPoolConfigurator
{
_reserves[asset].configuration.data = configuration;
}
@ -803,9 +791,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
* @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();
function setPause(bool val) external override onlyLendingPoolConfigurator {
_paused = val;
if (_paused) {
emit Paused();
@ -923,7 +909,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
_reserves[asset].id = uint8(reservesCount);
_reservesList[reservesCount] = asset;
_reservesCount++;
_reservesCount = reservesCount + 1;
}
}
}

17
contracts/lendingpool/LendingPoolCollateralManager.sol
View File

@ -57,6 +57,13 @@ contract LendingPoolCollateralManager is VersionedInitializable, LendingPoolStor
bool receiveAToken
);
/**
* @dev emitted when a user disables a reserve as collateral
* @param reserve the address of the reserve
* @param user the address of the user
**/
event ReserveUsedAsCollateralDisabled(address indexed reserve, address indexed user);
struct LiquidationCallLocalVars {
uint256 userCollateralBalance;
uint256 userStableDebt;
@ -120,7 +127,7 @@ contract LendingPoolCollateralManager is VersionedInitializable, LendingPoolStor
(, , , , vars.healthFactor) = GenericLogic.calculateUserAccountData(
user,
_reserves,
_usersConfig[user],
userConfig,
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
@ -246,6 +253,14 @@ contract LendingPoolCollateralManager is VersionedInitializable, LendingPoolStor
);
}
//if the collateral being liquidated is equal to the user balance,
//we set the currency as not being used as collateral anymore
if (vars.maxCollateralToLiquidate == vars.userCollateralBalance) {
userConfig.setUsingAsCollateral(collateralReserve.id, false);
emit ReserveUsedAsCollateralDisabled(collateral, user);
}
//transfers the principal currency to the aToken
IERC20(principal).safeTransferFrom(
msg.sender,

19
contracts/lendingpool/LendingPoolConfigurator.sol
View File

@ -365,11 +365,13 @@ contract LendingPoolConfigurator is VersionedInitializable {
}
/**
* @dev configures the reserve collateralization parameters
* @dev configures the reserve collateralization parameters.
* all the values are expressed in percentages with two decimals of precision. A valid value is 10000, which means 100.00%
* @param asset the address of the reserve
* @param ltv the loan to value of the asset when used as collateral
* @param liquidationThreshold the threshold at which loans using this asset as collateral will be considered undercollateralized
* @param liquidationBonus the bonus liquidators receive to liquidate this asset
* @param liquidationBonus the bonus liquidators receive to liquidate this asset. The values is always above 100%. A value of 105%
* means the liquidator will receive a 5% bonus
**/
function configureReserveAsCollateral(
address asset,
@ -386,11 +388,14 @@ contract LendingPoolConfigurator is VersionedInitializable {
if (liquidationThreshold != 0) {
//liquidation bonus must be bigger than 100.00%, otherwise the liquidator would receive less
//collateral than needed to cover the debt
require(
liquidationBonus > PercentageMath.PERCENTAGE_FACTOR,
Errors.LPC_INVALID_CONFIGURATION
);
//collateral than needed to cover the debt.
uint256 absoluteBonus = liquidationBonus.sub(PercentageMath.PERCENTAGE_FACTOR, Errors.LPC_INVALID_CONFIGURATION);
require(absoluteBonus > 0, Errors.LPC_INVALID_CONFIGURATION);
//we also need to require that the liq threshold is lower or equal than the liquidation bonus, to ensure that
//there is always enough margin for liquidators to receive the bonus.
require(liquidationThreshold.add(absoluteBonus) <= PercentageMath.PERCENTAGE_FACTOR, Errors.LPC_INVALID_CONFIGURATION);
} else {
require(liquidationBonus == 0, Errors.LPC_INVALID_CONFIGURATION);
//if the liquidation threshold is being set to 0,

2
contracts/libraries/configuration/ReserveConfiguration.sol
View File

@ -86,7 +86,7 @@ library ReserveConfiguration {
}
/**
* @dev gets the Loan to Value of the reserve
* @dev gets the liquidation threshold of the reserve
* @param self the reserve configuration
* @return the liquidation threshold
**/

6
contracts/libraries/configuration/UserConfiguration.sol
View File

@ -1,6 +1,7 @@
// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.6.8;
import {Errors} from '../helpers/Errors.sol';
/**
* @title UserConfiguration library
* @author Aave
@ -24,6 +25,7 @@ library UserConfiguration {
uint256 reserveIndex,
bool borrowing
) internal {
require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
self.data =
(self.data & ~(1 << (reserveIndex * 2))) |
(uint256(borrowing ? 1 : 0) << (reserveIndex * 2));
@ -40,6 +42,7 @@ library UserConfiguration {
uint256 reserveIndex,
bool _usingAsCollateral
) internal {
require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
self.data =
(self.data & ~(1 << (reserveIndex * 2 + 1))) |
(uint256(_usingAsCollateral ? 1 : 0) << (reserveIndex * 2 + 1));
@ -56,6 +59,7 @@ library UserConfiguration {
pure
returns (bool)
{
require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
return (self.data >> (reserveIndex * 2)) & 3 != 0;
}
@ -70,6 +74,7 @@ library UserConfiguration {
pure
returns (bool)
{
require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
return (self.data >> (reserveIndex * 2)) & 1 != 0;
}
@ -84,6 +89,7 @@ library UserConfiguration {
pure
returns (bool)
{
require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
return (self.data >> (reserveIndex * 2 + 1)) & 1 != 0;
}

2
contracts/libraries/helpers/Errors.sol
View File

@ -96,6 +96,8 @@ library Errors {
string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = '72';
string public constant VL_INCONSISTENT_FLASHLOAN_PARAMS = '73';
string public constant LP_INCONSISTENT_PARAMS_LENGTH = '74';
string public constant UL_INVALID_INDEX = '77';
string public constant LP_NOT_CONTRACT = '78';
enum CollateralManagerErrors {
NO_ERROR,

14
contracts/libraries/logic/ReserveLogic.sol
View File

@ -76,7 +76,7 @@ library ReserveLogic {
/**
* @dev returns the ongoing normalized income for the reserve.
* a value of 1e27 means there is no income. As time passes, the income is accrued.
* A value of 2*1e27 means for each unit of assset two units of income have been accrued.
* A value of 2*1e27 means for each unit of asset one unit of income has been accrued.
* @param reserve the reserve object
* @return the normalized income. expressed in ray
**/
@ -185,15 +185,9 @@ library ReserveLogic {
address interestRateStrategyAddress
) external {
require(reserve.aTokenAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED);
if (reserve.liquidityIndex == 0) {
//if the reserve has not been initialized yet
reserve.liquidityIndex = uint128(WadRayMath.ray());
}
if (reserve.variableBorrowIndex == 0) {
reserve.variableBorrowIndex = uint128(WadRayMath.ray());
}
reserve.liquidityIndex = uint128(WadRayMath.ray());
reserve.variableBorrowIndex = uint128(WadRayMath.ray());
reserve.aTokenAddress = aTokenAddress;
reserve.stableDebtTokenAddress = stableDebtTokenAddress;
reserve.variableDebtTokenAddress = variableDebtTokenAddress;

57
contracts/libraries/logic/ValidationLogic.sol
View File

@ -13,6 +13,7 @@ import {ReserveConfiguration} from '../configuration/ReserveConfiguration.sol';
import {UserConfiguration} from '../configuration/UserConfiguration.sol';
import {Errors} from '../helpers/Errors.sol';
import {Helpers} from '../helpers/Helpers.sol';
import {IReserveInterestRateStrategy} from '../../interfaces/IReserveInterestRateStrategy.sol';
/**
* @title ReserveLogic library
@ -28,6 +29,9 @@ library ValidationLogic {
using ReserveConfiguration for ReserveConfiguration.Map;
using UserConfiguration for UserConfiguration.Map;
uint256 public constant REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD = 4000;
uint256 public constant REBALANCE_UP_USAGE_RATIO_THRESHOLD = 0.95 * 1e27; //usage ratio of 95%
/**
* @dev validates a deposit.
* @param reserve the reserve state on which the user is depositing
@ -62,10 +66,13 @@ library ValidationLogic {
uint256 reservesCount,
address oracle
) external view {
require(amount != 0, Errors.VL_INVALID_AMOUNT);
require(amount != 0, Errors.VL_INVALID_AMOUNT);
require(amount <= userBalance, Errors.VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE);
(bool isActive,, , ) = reservesData[reserveAddress].configuration.getFlags();
require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
require(
GenericLogic.balanceDecreaseAllowed(
reserveAddress,
@ -293,6 +300,54 @@ library ValidationLogic {
}
}
/**
* @dev validates a stable borrow rate rebalance
* @param reserve the reserve state on which the user is getting rebalanced
* @param reserveAddress the address of the reserve
* @param stableDebtToken the stable debt token instance
* @param variableDebtToken the variable debt token instance
* @param aTokenAddress the address of the aToken contract
*/
function validateRebalanceStableBorrowRate(
ReserveLogic.ReserveData storage reserve,
address reserveAddress,
IERC20 stableDebtToken,
IERC20 variableDebtToken,
address aTokenAddress) external view {
(bool isActive,,, ) = reserve.configuration.getFlags();
require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
//if the usage ratio is below 95%, no rebalances are needed
uint256 totalDebt = stableDebtToken
.totalSupply()
.add(variableDebtToken.totalSupply())
.wadToRay();
uint256 availableLiquidity = IERC20(reserveAddress).balanceOf(aTokenAddress).wadToRay();
uint256 usageRatio = totalDebt == 0
? 0
: totalDebt.rayDiv(availableLiquidity.add(totalDebt));
//if the liquidity rate is below REBALANCE_UP_THRESHOLD of the max variable APR at 95% usage,
//then we allow rebalancing of the stable rate positions.
uint256 currentLiquidityRate = reserve.currentLiquidityRate;
uint256 maxVariableBorrowRate = IReserveInterestRateStrategy(
reserve
.interestRateStrategyAddress
)
.getMaxVariableBorrowRate();
require(
usageRatio >= REBALANCE_UP_USAGE_RATIO_THRESHOLD &&
currentLiquidityRate <=
maxVariableBorrowRate.percentMul(REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD),
Errors.LP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET
);
}
/**
* @dev validates the choice of a user of setting (or not) an asset as collateral
* @param reserve the state of the reserve that the user is enabling or disabling as collateral

2
contracts/tokenization/AToken.sol
View File

@ -175,6 +175,8 @@ contract AToken is VersionedInitializable, IncentivizedERC20, IAToken {
//being a normal transfer, the Transfer() and BalanceTransfer() are emitted
//so no need to emit a specific event here
_transfer(from, to, value, false);
emit Transfer(from, to, value);
}
/**

2
deployed-contracts.json
View File

@ -1285,4 +1285,4 @@
"address": "0xaDF23b1cAa6a7B3b077c432794FfF80A4b935cdF"
}
}
}
}

174
package-lock.json generated
View File

@ -5293,13 +5293,13 @@
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@ -5308,7 +5308,7 @@
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@ -5317,7 +5317,7 @@
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"dev": true,
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@ -5326,19 +5326,19 @@
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"dev": true
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"dev": true,
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@ -5352,25 +5352,25 @@
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"dev": true
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"integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
"dev": true
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"cipher-base": {
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@ -5380,7 +5380,7 @@
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"cliui": {
"version": "5.0.0",
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@ -5391,7 +5391,7 @@
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"color-convert": {
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