Contract Source Code:
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly {
codehash := extcodehash(account)
}
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, 'Address: insufficient balance');
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{value: amount}('');
require(success, 'Address: unable to send value, recipient may have reverted');
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import './BaseAdminUpgradeabilityProxy.sol';
/**
* @title AdminUpgradeabilityProxy
* @dev Extends from BaseAdminUpgradeabilityProxy with a constructor for
* initializing the implementation, admin, and init data.
*/
contract AdminUpgradeabilityProxy is BaseAdminUpgradeabilityProxy, UpgradeabilityProxy {
/**
* Contract constructor.
* @param _logic address of the initial implementation.
* @param _admin Address of the proxy administrator.
* @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
* It should include the signature and the parameters of the function to be called, as described in
* https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
* This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
*/
constructor(
address _logic,
address _admin,
bytes memory _data
) public payable UpgradeabilityProxy(_logic, _data) {
assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1));
_setAdmin(_admin);
}
/**
* @dev Only fall back when the sender is not the admin.
*/
function _willFallback() internal override(BaseAdminUpgradeabilityProxy, Proxy) {
BaseAdminUpgradeabilityProxy._willFallback();
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import './UpgradeabilityProxy.sol';
/**
* @title BaseAdminUpgradeabilityProxy
* @dev This contract combines an upgradeability proxy with an authorization
* mechanism for administrative tasks.
* All external functions in this contract must be guarded by the
* `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
* feature proposal that would enable this to be done automatically.
*/
contract BaseAdminUpgradeabilityProxy is BaseUpgradeabilityProxy {
/**
* @dev Emitted when the administration has been transferred.
* @param previousAdmin Address of the previous admin.
* @param newAdmin Address of the new admin.
*/
event AdminChanged(address previousAdmin, address newAdmin);
/**
* @dev Storage slot with the admin of the contract.
* This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
* validated in the constructor.
*/
bytes32 internal constant ADMIN_SLOT =
0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
/**
* @dev Modifier to check whether the `msg.sender` is the admin.
* If it is, it will run the function. Otherwise, it will delegate the call
* to the implementation.
*/
modifier ifAdmin() {
if (msg.sender == _admin()) {
_;
} else {
_fallback();
}
}
/**
* @return The address of the proxy admin.
*/
function admin() external ifAdmin returns (address) {
return _admin();
}
/**
* @return The address of the implementation.
*/
function implementation() external ifAdmin returns (address) {
return _implementation();
}
/**
* @dev Changes the admin of the proxy.
* Only the current admin can call this function.
* @param newAdmin Address to transfer proxy administration to.
*/
function changeAdmin(address newAdmin) external ifAdmin {
require(newAdmin != address(0), 'Cannot change the admin of a proxy to the zero address');
emit AdminChanged(_admin(), newAdmin);
_setAdmin(newAdmin);
}
/**
* @dev Upgrade the backing implementation of the proxy.
* Only the admin can call this function.
* @param newImplementation Address of the new implementation.
*/
function upgradeTo(address newImplementation) external ifAdmin {
_upgradeTo(newImplementation);
}
/**
* @dev Upgrade the backing implementation of the proxy and call a function
* on the new implementation.
* This is useful to initialize the proxied contract.
* @param newImplementation Address of the new implementation.
* @param data Data to send as msg.data in the low level call.
* It should include the signature and the parameters of the function to be called, as described in
* https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
*/
function upgradeToAndCall(address newImplementation, bytes calldata data)
external
payable
ifAdmin
{
_upgradeTo(newImplementation);
(bool success, ) = newImplementation.delegatecall(data);
require(success, "upgradeToAndCall failed");
}
/**
* @return adm The admin slot.
*/
function _admin() internal view returns (address adm) {
bytes32 slot = ADMIN_SLOT;
//solium-disable-next-line
assembly {
adm := sload(slot)
}
}
/**
* @dev Sets the address of the proxy admin.
* @param newAdmin Address of the new proxy admin.
*/
function _setAdmin(address newAdmin) internal {
bytes32 slot = ADMIN_SLOT;
//solium-disable-next-line
assembly {
sstore(slot, newAdmin)
}
}
/**
* @dev Only fall back when the sender is not the admin.
*/
function _willFallback() internal virtual override {
require(msg.sender != _admin(), 'Cannot call fallback function from the proxy admin');
super._willFallback();
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import './BaseUpgradeabilityProxy.sol';
/**
* @title BaseImmutableAdminUpgradeabilityProxy
* @author Lever, inspired by the OpenZeppelin upgradeability proxy pattern
* @dev This contract combines an upgradeability proxy with an authorization
* mechanism for administrative tasks. The admin role is stored in an immutable, which
* helps saving transactions costs
* All external functions in this contract must be guarded by the
* `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
* feature proposal that would enable this to be done automatically.
*/
contract BaseImmutableAdminUpgradeabilityProxy is BaseUpgradeabilityProxy {
address immutable ADMIN;
constructor(address admin) public {
ADMIN = admin;
}
modifier ifAdmin() {
if (msg.sender == ADMIN) {
_;
} else {
_fallback();
}
}
/**
* @return The address of the proxy admin.
*/
function admin() external ifAdmin returns (address) {
return ADMIN;
}
/**
* @return The address of the implementation.
*/
function implementation() external ifAdmin returns (address) {
return _implementation();
}
/**
* @dev Upgrade the backing implementation of the proxy.
* Only the admin can call this function.
* @param newImplementation Address of the new implementation.
*/
function upgradeTo(address newImplementation) external ifAdmin {
_upgradeTo(newImplementation);
}
/**
* @dev Upgrade the backing implementation of the proxy and call a function
* on the new implementation.
* This is useful to initialize the proxied contract.
* @param newImplementation Address of the new implementation.
* @param data Data to send as msg.data in the low level call.
* It should include the signature and the parameters of the function to be called, as described in
* https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
*/
function upgradeToAndCall(address newImplementation, bytes calldata data)
external
payable
ifAdmin
{
_upgradeTo(newImplementation);
(bool success, ) = newImplementation.delegatecall(data);
require(success, "upgradeToAndCall failed");
}
/**
* @dev Only fall back when the sender is not the admin.
*/
function _willFallback() internal virtual override {
require(msg.sender != ADMIN, 'Cannot call fallback function from the proxy admin');
super._willFallback();
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import './Proxy.sol';
import './Address.sol';
/**
* @title BaseUpgradeabilityProxy
* @dev This contract implements a proxy that allows to change the
* implementation address to which it will delegate.
* Such a change is called an implementation upgrade.
*/
contract BaseUpgradeabilityProxy is Proxy {
/**
* @dev Emitted when the implementation is upgraded.
* @param implementation Address of the new implementation.
*/
event Upgraded(address indexed implementation);
/**
* @dev Storage slot with the address of the current implementation.
* This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
* validated in the constructor.
*/
bytes32 internal constant IMPLEMENTATION_SLOT =
0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
/**
* @dev Returns the current implementation.
* @return impl Address of the current implementation
*/
function _implementation() internal view override returns (address impl) {
bytes32 slot = IMPLEMENTATION_SLOT;
//solium-disable-next-line
assembly {
impl := sload(slot)
}
}
/**
* @dev Upgrades the proxy to a new implementation.
* @param newImplementation Address of the new implementation.
*/
function _upgradeTo(address newImplementation) internal {
_setImplementation(newImplementation);
emit Upgraded(newImplementation);
}
/**
* @dev Sets the implementation address of the proxy.
* @param newImplementation Address of the new implementation.
*/
function _setImplementation(address newImplementation) internal {
require(
Address.isContract(newImplementation),
'Cannot set a proxy implementation to a non-contract address'
);
bytes32 slot = IMPLEMENTATION_SLOT;
//solium-disable-next-line
assembly {
sstore(slot, newImplementation)
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
library DataTypes {
// refer to the whitepaper, section 1.1 basic concepts for a formal description of these properties.
struct ReserveData {
//stores the reserve configuration
ReserveConfigurationMap configuration;
//the liquidity index. Expressed in ray
uint128 liquidityIndex;
//variable borrow index. Expressed in ray
uint128 variableBorrowIndex;
//the current supply rate. Expressed in ray
uint128 currentLiquidityRate;
//the current variable borrow rate. Expressed in ray
uint128 currentVariableBorrowRate;
uint40 lastUpdateTimestamp;
//tokens addresses
address xTokenAddress;
address variableDebtTokenAddress;
//address of the interest rate strategy
address interestRateStrategyAddress;
//the id of the reserve. Represents the position in the list of the active reserves
uint8 id;
}
struct ReserveConfigurationMap {
//bit 0-15: LTV
//bit 16-31: Liq. threshold
//bit 32-47: Liq. bonus
//bit 48-55: Decimals
//bit 56: Reserve is active
//bit 57: reserve is frozen
//bit 58: borrowing is enabled
//bit 60-63: reserved
//bit 64-79: reserve factor
uint256 data;
}
struct UserConfigurationMap {
uint256 data;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IMarginPool} from './IMarginPool.sol';
import {ICreditDelegationToken} from './ICreditDelegationToken.sol';
import {IncentivizedERC20} from './IncentivizedERC20.sol';
import {Errors} from './Errors.sol';
/**
* @title DebtTokenBase
* @author Lever
*/
abstract contract DebtTokenBase is
IncentivizedERC20,
ICreditDelegationToken
{
address public immutable UNDERLYING_ASSET_ADDRESS;
IMarginPool public immutable POOL;
mapping(address => mapping(address => uint256)) internal _borrowAllowances;
/**
* @dev Only margin pool can call functions marked by this modifier
**/
modifier onlyMarginPool {
require(_msgSender() == address(POOL), Errors.CT_CALLER_MUST_BE_MARGIN_POOL);
_;
}
/**
* @dev The metadata of the token will be set on the proxy, that the reason of
* passing "NULL" and 0 as metadata
*/
constructor(
address pool,
address underlyingAssetAddress,
string memory name,
string memory symbol,
uint8 decimals
) public IncentivizedERC20(name, symbol, decimals) {
POOL = IMarginPool(pool);
UNDERLYING_ASSET_ADDRESS = underlyingAssetAddress;
}
/**
* @dev delegates borrowing power to a user on the specific debt token
* @param delegatee the address receiving the delegated borrowing power
* @param amount the maximum amount being delegated. Delegation will still
* respect the liquidation constraints (even if delegated, a delegatee cannot
* force a delegator HF to go below 1)
**/
function approveDelegation(address delegatee, uint256 amount) external override {
_borrowAllowances[_msgSender()][delegatee] = amount;
emit BorrowAllowanceDelegated(_msgSender(), delegatee, UNDERLYING_ASSET_ADDRESS, amount);
}
/**
* @dev returns the borrow allowance of the user
* @param fromUser The user to giving allowance
* @param toUser The user to give allowance to
* @return the current allowance of toUser
**/
function borrowAllowance(address fromUser, address toUser)
external
view
override
returns (uint256)
{
return _borrowAllowances[fromUser][toUser];
}
/**
* @dev Being non transferrable, the debt token does not implement any of the
* standard ERC20 functions for transfer and allowance.
**/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
recipient;
amount;
revert('TRANSFER_NOT_SUPPORTED');
}
function allowance(address owner, address spender)
public
view
virtual
override
returns (uint256)
{
owner;
spender;
revert('ALLOWANCE_NOT_SUPPORTED');
}
function approve(address spender, uint256 amount) public virtual override returns (bool) {
spender;
amount;
revert('APPROVAL_NOT_SUPPORTED');
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
sender;
recipient;
amount;
revert('TRANSFER_NOT_SUPPORTED');
}
function increaseAllowance(address spender, uint256 addedValue)
public
virtual
override
returns (bool)
{
spender;
addedValue;
revert('ALLOWANCE_NOT_SUPPORTED');
}
function decreaseAllowance(address spender, uint256 subtractedValue)
public
virtual
override
returns (bool)
{
spender;
subtractedValue;
revert('ALLOWANCE_NOT_SUPPORTED');
}
function _decreaseBorrowAllowance(
address delegator,
address delegatee,
uint256 amount
) internal {
uint256 newAllowance =
_borrowAllowances[delegator][delegatee].sub(amount, Errors.BORROW_ALLOWANCE_NOT_ENOUGH);
_borrowAllowances[delegator][delegatee] = newAllowance;
emit BorrowAllowanceDelegated(delegator, delegatee, UNDERLYING_ASSET_ADDRESS, newAllowance);
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {SafeMath} from './SafeMath.sol';
import {IReserveInterestRateStrategy} from './IReserveInterestRateStrategy.sol';
import {WadRayMath} from './WadRayMath.sol';
import {PercentageMath} from './PercentageMath.sol';
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
/**
* @title DefaultReserveInterestRateStrategy contract
* @notice Implements the calculation of the interest rates depending on the reserve state
* @dev The model of interest rate is based on 2 slopes, one before the `OPTIMAL_UTILIZATION_RATE`
* point of utilization and another from that one to 100%
* @author Lever
**/
contract DefaultReserveInterestRateStrategy is IReserveInterestRateStrategy {
using WadRayMath for uint256;
using SafeMath for uint256;
using PercentageMath for uint256;
/**
* @dev this constant represents the utilization rate at which the pool aims to obtain most competitive borrow rates.
* Expressed in ray
**/
uint256 public immutable OPTIMAL_UTILIZATION_RATE;
/**
* @dev This constant represents the excess utilization rate above the optimal. It's always equal to
* 1-optimal utilization rate. Added as a constant here for gas optimizations.
* Expressed in ray
**/
uint256 public immutable EXCESS_UTILIZATION_RATE;
IMarginPoolAddressesProvider public immutable addressesProvider;
// Base variable borrow rate when Utilization rate = 0. Expressed in ray
uint256 internal immutable _baseVariableBorrowRate;
// Slope of the variable interest curve when utilization rate > 0 and <= OPTIMAL_UTILIZATION_RATE. Expressed in ray
uint256 internal immutable _variableRateSlope1;
// Slope of the variable interest curve when utilization rate > OPTIMAL_UTILIZATION_RATE. Expressed in ray
uint256 internal immutable _variableRateSlope2;
constructor(
IMarginPoolAddressesProvider provider,
uint256 optimalUtilizationRate,
uint256 baseVariableBorrowRate,
uint256 variableRateSlope1,
uint256 variableRateSlope2
) public {
OPTIMAL_UTILIZATION_RATE = optimalUtilizationRate;
EXCESS_UTILIZATION_RATE = WadRayMath.ray().sub(optimalUtilizationRate);
addressesProvider = provider;
_baseVariableBorrowRate = baseVariableBorrowRate;
_variableRateSlope1 = variableRateSlope1;
_variableRateSlope2 = variableRateSlope2;
}
function variableRateSlope1() external view returns (uint256) {
return _variableRateSlope1;
}
function variableRateSlope2() external view returns (uint256) {
return _variableRateSlope2;
}
function baseVariableBorrowRate() external view override returns (uint256) {
return _baseVariableBorrowRate;
}
function getMaxVariableBorrowRate() external view override returns (uint256) {
return _baseVariableBorrowRate.add(_variableRateSlope1).add(_variableRateSlope2);
}
struct CalcInterestRatesLocalVars {
uint256 totalDebt;
uint256 currentVariableBorrowRate;
uint256 currentLiquidityRate;
uint256 utilizationRate;
}
/**
* @dev Calculates the interest rates depending on the reserve's state and configurations
* @param availableLiquidity The liquidity available in the reserve
* @param totalVariableDebt The total borrowed from the reserve at a variable rate
* @param reserveFactor The reserve portion of the interest that goes to the treasury address.
* @return The liquidity rate, the variable borrow rate
**/
function calculateInterestRates(
uint256 availableLiquidity,
uint256 totalVariableDebt,
uint256 reserveFactor
)
external
view
override
returns (
uint256,
uint256
)
{
CalcInterestRatesLocalVars memory vars;
vars.totalDebt = totalVariableDebt;
vars.currentVariableBorrowRate = 0;
vars.currentLiquidityRate = 0;
uint256 utilizationRate =
vars.totalDebt == 0 ? 0 : vars.totalDebt.rayDiv(availableLiquidity.add(vars.totalDebt));
if (utilizationRate > OPTIMAL_UTILIZATION_RATE) {
uint256 excessUtilizationRateRatio =
utilizationRate.sub(OPTIMAL_UTILIZATION_RATE).rayDiv(EXCESS_UTILIZATION_RATE);
vars.currentVariableBorrowRate = _baseVariableBorrowRate.add(_variableRateSlope1).add(
_variableRateSlope2.rayMul(excessUtilizationRateRatio)
);
} else {
vars.currentVariableBorrowRate = _baseVariableBorrowRate.add(
utilizationRate.rayMul(_variableRateSlope1).rayDiv(OPTIMAL_UTILIZATION_RATE)
);
}
vars.currentLiquidityRate = _getOverallBorrowRate(
totalVariableDebt,
vars.currentVariableBorrowRate
)
.rayMul(utilizationRate)
.percentMul(PercentageMath.PERCENTAGE_FACTOR.sub(reserveFactor));
return (
vars.currentLiquidityRate,
vars.currentVariableBorrowRate
);
}
/**
* @dev Calculates the overall borrow rate as the weighted average between the total variable debt
* @param totalVariableDebt The total borrowed from the reserve at a variable rate
* @param currentVariableBorrowRate The current variable borrow rate of the reserve
* @return The weighted averaged borrow rate
**/
function _getOverallBorrowRate(
uint256 totalVariableDebt,
uint256 currentVariableBorrowRate
) internal pure returns (uint256) {
if (totalVariableDebt == 0) return 0;
uint256 weightedVariableRate = totalVariableDebt.wadToRay().rayMul(currentVariableBorrowRate);
uint256 overallBorrowRate =
weightedVariableRate.rayDiv(totalVariableDebt.wadToRay());
return overallBorrowRate;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import './Context.sol';
import './IERC20.sol';
import './SafeMath.sol';
import './Address.sol';
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
using Address for address;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
* called.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender)
public
view
virtual
override
returns (uint256)
{
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(
sender,
_msgSender(),
_allowances[sender][_msgSender()].sub(amount, 'ERC20: transfer amount exceeds allowance')
);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue)
public
virtual
returns (bool)
{
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].sub(
subtractedValue,
'ERC20: decreased allowance below zero'
)
);
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), 'ERC20: transfer from the zero address');
require(recipient != address(0), 'ERC20: transfer to the zero address');
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, 'ERC20: transfer amount exceeds balance');
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), 'ERC20: mint to the zero address');
_beforeTokenTransfer(address(0), account, amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), 'ERC20: burn from the zero address');
_beforeTokenTransfer(account, address(0), amount);
_balances[account] = _balances[account].sub(amount, 'ERC20: burn amount exceeds balance');
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), 'ERC20: approve from the zero address');
require(spender != address(0), 'ERC20: approve to the zero address');
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be to transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/**
* @title Errors library
* @author Lever
* @notice Defines the error messages emitted by the different contracts of the Lever protocol
* @dev Error messages prefix glossary:
* - VL = ValidationLogic
* - MATH = Math libraries
* - CT = Common errors between tokens (XToken, VariableDebtToken)
* - XT = XToken
* - DT = VariableDebtToken
* - MP = MarginPool
* - MPAPR = MarginPoolAddressesProviderRegistry
* - MPC = MarginPoolConfiguration
* - RL = ReserveLogic
* - MPCM = MarginPoolCollateralManager
* - P = Pausable
*/
library Errors {
//common errors
string public constant CALLER_NOT_POOL_ADMIN = '33'; // 'The caller must be the pool admin'
string public constant BORROW_ALLOWANCE_NOT_ENOUGH = '59'; // User borrows on behalf, but allowance are too small
//contract specific errors
string public constant VL_INVALID_AMOUNT = '1'; // 'Amount must be greater than 0'
string public constant VL_NO_ACTIVE_RESERVE = '2'; // 'Action requires an active reserve'
string public constant VL_RESERVE_FROZEN = '3'; // 'Action cannot be performed because the reserve is frozen'
string public constant VL_CURRENT_AVAILABLE_LIQUIDITY_NOT_ENOUGH = '4'; // 'The current liquidity is not enough'
string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = '5'; // 'User cannot withdraw more than the available balance'
string public constant VL_TRANSFER_NOT_ALLOWED = '6'; // 'Transfer cannot be allowed.'
string public constant VL_BORROWING_NOT_ENABLED = '7'; // 'Borrowing is not enabled'
string public constant VL_INVALID_INTEREST_RATE_MODE_SELECTED = '8'; // 'Invalid interest rate mode selected'
string public constant VL_COLLATERAL_BALANCE_IS_0 = '9'; // 'The collateral balance is 0'
string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = '10'; // 'Health factor is lesser than the liquidation threshold'
string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = '11'; // 'There is not enough collateral to cover a new borrow'
string public constant VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY = '13'; // collateral is (mostly) the same currency that is being borrowed
string public constant VL_NO_DEBT_OF_SELECTED_TYPE = '15'; // 'he needs to have variable debt'
string public constant VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF = '16'; // 'To repay on behalf of an user an explicit amount to repay is needed'
string public constant VL_NO_VARIABLE_RATE_LOAN_IN_RESERVE = '18'; // 'User does not have a variable rate loan in progress on this reserve'
string public constant VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0 = '19'; // 'The underlying balance needs to be greater than 0'
string public constant VL_DEPOSIT_ALREADY_IN_USE = '20'; // 'User deposit is already being used as collateral'
string public constant MP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET = '22'; // 'Interest rate rebalance conditions were not met'
string public constant MP_LIQUIDATION_CALL_FAILED = '23'; // 'Liquidation call failed'
string public constant MP_NOT_ENOUGH_LIQUIDITY_TO_BORROW = '24'; // 'There is not enough liquidity available to borrow'
string public constant MP_REQUESTED_AMOUNT_TOO_SMALL = '25'; // 'The requested amount is too small for a FlashLoan.'
string public constant MP_INCONSISTENT_PROTOCOL_ACTUAL_BALANCE = '26'; // 'The actual balance of the protocol is inconsistent'
string public constant MP_CALLER_NOT_MARGIN_POOL_CONFIGURATOR = '27'; // 'The caller of the function is not the margin pool configurator'
string public constant MP_INCONSISTENT_FLASHLOAN_PARAMS = '28';
string public constant CT_CALLER_MUST_BE_MARGIN_POOL = '29'; // 'The caller of this function must be a margin pool'
string public constant CT_CANNOT_GIVE_ALLOWANCE_TO_HIMSELF = '30'; // 'User cannot give allowance to himself'
string public constant CT_TRANSFER_AMOUNT_NOT_GT_0 = '31'; // 'Transferred amount needs to be greater than zero'
string public constant RL_RESERVE_ALREADY_INITIALIZED = '32'; // 'Reserve has already been initialized'
string public constant MPC_RESERVE_LIQUIDITY_NOT_0 = '34'; // 'The liquidity of the reserve needs to be 0'
string public constant MPC_INVALID_XTOKEN_POOL_ADDRESS = '35'; // 'The liquidity of the reserve needs to be 0'
string public constant MPC_INVALID_VARIABLE_DEBT_TOKEN_POOL_ADDRESS = '37'; // 'The liquidity of the reserve needs to be 0'
string public constant MPC_INVALID_VARIABLE_DEBT_TOKEN_UNDERLYING_ADDRESS = '39'; // 'The liquidity of the reserve needs to be 0'
string public constant MPC_INVALID_ADDRESSES_PROVIDER_ID = '40'; // 'The liquidity of the reserve needs to be 0'
string public constant MPC_INVALID_CONFIGURATION = '75'; // 'Invalid risk parameters for the reserve'
string public constant MPC_CALLER_NOT_EMERGENCY_ADMIN = '76'; // 'The caller must be the emergency admin'
string public constant MPAPR_PROVIDER_NOT_REGISTERED = '41'; // 'Provider is not registered'
string public constant MPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD = '42'; // 'Health factor is not below the threshold'
string public constant MPCM_COLLATERAL_CANNOT_BE_LIQUIDATED = '43'; // 'The collateral chosen cannot be liquidated'
string public constant MPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = '44'; // 'User did not borrow the specified currency'
string public constant MPCM_NOT_ENOUGH_LIQUIDITY_TO_LIQUIDATE = '45'; // "There isn't enough liquidity available to liquidate"
string public constant MPCM_NO_ERRORS = '46'; // 'No errors'
string public constant MP_INVALID_FLASHLOAN_MODE = '47'; //Invalid flashloan mode selected
string public constant MATH_MULTIPLICATION_OVERFLOW = '48';
string public constant MATH_ADDITION_OVERFLOW = '49';
string public constant MATH_DIVISION_BY_ZERO = '50';
string public constant RL_LIQUIDITY_INDEX_OVERFLOW = '51'; // Liquidity index overflows uint128
string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = '52'; // Variable borrow index overflows uint128
string public constant RL_LIQUIDITY_RATE_OVERFLOW = '53'; // Liquidity rate overflows uint128
string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = '54'; // Variable borrow rate overflows uint128
string public constant CT_INVALID_MINT_AMOUNT = '56'; //invalid amount to mint
string public constant MP_FAILED_REPAY_WITH_COLLATERAL = '57';
string public constant CT_INVALID_BURN_AMOUNT = '58'; //invalid amount to burn
string public constant MP_FAILED_COLLATERAL_SWAP = '60';
string public constant MP_INVALID_EQUAL_ASSETS_TO_SWAP = '61';
string public constant MP_REENTRANCY_NOT_ALLOWED = '62';
string public constant MP_CALLER_MUST_BE_AN_XTOKEN = '63';
string public constant MP_IS_PAUSED = '64'; // 'Pool is paused'
string public constant MP_NO_MORE_RESERVES_ALLOWED = '65';
string public constant MP_INVALID_FLASH_LOAN_EXECUTOR_RETURN = '66';
string public constant RC_INVALID_LTV = '67';
string public constant RC_INVALID_LIQ_THRESHOLD = '68';
string public constant RC_INVALID_LIQ_BONUS = '69';
string public constant RC_INVALID_DECIMALS = '70';
string public constant RC_INVALID_RESERVE_FACTOR = '71';
string public constant MPAPR_INVALID_ADDRESSES_PROVIDER_ID = '72';
string public constant VL_INCONSISTENT_FLASHLOAN_PARAMS = '73';
string public constant MP_INCONSISTENT_PARAMS_LENGTH = '74';
string public constant UL_INVALID_INDEX = '77';
string public constant MP_NOT_CONTRACT = '78';
string public constant SDT_BURN_EXCEEDS_BALANCE = '80';
enum CollateralManagerErrors {
NO_ERROR,
NO_COLLATERAL_AVAILABLE,
COLLATERAL_CANNOT_BE_LIQUIDATED,
CURRRENCY_NOT_BORROWED,
HEALTH_FACTOR_ABOVE_THRESHOLD,
NOT_ENOUGH_LIQUIDITY,
NO_ACTIVE_RESERVE,
HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD,
INVALID_EQUAL_ASSETS_TO_SWAP,
FROZEN_RESERVE
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import {SafeMath} from './SafeMath.sol';
import {IERC20} from './IERC20.sol';
import {ReserveLogic} from './ReserveLogic.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {UserConfiguration} from './UserConfiguration.sol';
import {WadRayMath} from './WadRayMath.sol';
import {PercentageMath} from './PercentageMath.sol';
import {IPriceOracleGetter} from './IPriceOracleGetter.sol';
import {DataTypes} from './DataTypes.sol';
/**
* @title GenericLogic library
* @author Lever
* @title Implements protocol-level logic to calculate and validate the state of a user
*/
library GenericLogic {
using ReserveLogic for DataTypes.ReserveData;
using SafeMath for uint256;
using WadRayMath for uint256;
using PercentageMath for uint256;
using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
using UserConfiguration for DataTypes.UserConfigurationMap;
uint256 public constant HEALTH_FACTOR_LIQUIDATION_THRESHOLD = 1 ether;
struct balanceDecreaseAllowedLocalVars {
uint256 decimals;
uint256 liquidationThreshold;
uint256 totalCollateralInETH;
uint256 totalDebtInETH;
uint256 avgLiquidationThreshold;
uint256 amountToDecreaseInETH;
uint256 collateralBalanceAfterDecrease;
uint256 liquidationThresholdAfterDecrease;
uint256 healthFactorAfterDecrease;
bool reserveUsageAsCollateralEnabled;
}
/**
* @dev Checks if a specific balance decrease is allowed
* (i.e. doesn't bring the user borrow position health factor under HEALTH_FACTOR_LIQUIDATION_THRESHOLD)
* @param asset The address of the underlying asset of the reserve
* @param user The address of the user
* @param amount The amount to decrease
* @param reservesData The data of all the reserves
* @param userConfig The user configuration
* @param reserves The list of all the active reserves
* @param oracle The address of the oracle contract
* @return true if the decrease of the balance is allowed
**/
function balanceDecreaseAllowed(
address asset,
address user,
uint256 amount,
mapping(address => DataTypes.ReserveData) storage reservesData,
DataTypes.UserConfigurationMap calldata userConfig,
mapping(uint256 => address) storage reserves,
uint256 reservesCount,
address oracle
) external view returns (bool) {
if (!userConfig.isBorrowingAny() || !userConfig.isUsingAsCollateral(reservesData[asset].id)) {
return true;
}
balanceDecreaseAllowedLocalVars memory vars;
(, vars.liquidationThreshold, , vars.decimals, ) = reservesData[asset]
.configuration
.getParams();
if (vars.liquidationThreshold == 0) {
return true;
}
(
vars.totalCollateralInETH,
vars.totalDebtInETH,
,
vars.avgLiquidationThreshold,
) = calculateUserAccountData(user, reservesData, userConfig, reserves, reservesCount, oracle);
if (vars.totalDebtInETH == 0) {
return true;
}
vars.amountToDecreaseInETH = IPriceOracleGetter(oracle).getAssetPrice(asset).mul(amount).div(
10**vars.decimals
);
vars.collateralBalanceAfterDecrease = vars.totalCollateralInETH.sub(vars.amountToDecreaseInETH);
//if there is a borrow, there can't be 0 collateral
if (vars.collateralBalanceAfterDecrease == 0) {
return false;
}
vars.liquidationThresholdAfterDecrease = vars
.totalCollateralInETH
.mul(vars.avgLiquidationThreshold)
.sub(vars.amountToDecreaseInETH.mul(vars.liquidationThreshold))
.div(vars.collateralBalanceAfterDecrease);
uint256 healthFactorAfterDecrease =
calculateHealthFactorFromBalances(
vars.collateralBalanceAfterDecrease,
vars.totalDebtInETH,
vars.liquidationThresholdAfterDecrease
);
return healthFactorAfterDecrease >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD;
}
struct CalculateUserAccountDataVars {
uint256 reserveUnitPrice;
uint256 tokenUnit;
uint256 compoundedLiquidityBalance;
uint256 compoundedBorrowBalance;
uint256 decimals;
uint256 ltv;
uint256 liquidationThreshold;
uint256 i;
uint256 healthFactor;
uint256 totalCollateralInETH;
uint256 totalDebtInETH;
uint256 avgLtv;
uint256 avgLiquidationThreshold;
uint256 reservesLength;
bool healthFactorBelowThreshold;
address currentReserveAddress;
bool usageAsCollateralEnabled;
bool userUsesReserveAsCollateral;
}
/**
* @dev Calculates the user data across the reserves.
* this includes the total liquidity/collateral/borrow balances in ETH,
* the average Loan To Value, the average Liquidation Ratio, and the Health factor.
* @param user The address of the user
* @param reservesData Data of all the reserves
* @param userConfig The configuration of the user
* @param reserves The list of the available reserves
* @param oracle The price oracle address
* @return The total collateral and total debt of the user in ETH, the avg ltv, liquidation threshold and the HF
**/
function calculateUserAccountData(
address user,
mapping(address => DataTypes.ReserveData) storage reservesData,
DataTypes.UserConfigurationMap memory userConfig,
mapping(uint256 => address) storage reserves,
uint256 reservesCount,
address oracle
)
internal
view
returns (
uint256,
uint256,
uint256,
uint256,
uint256
)
{
CalculateUserAccountDataVars memory vars;
if (userConfig.isEmpty()) {
return (0, 0, 0, 0, uint256(-1));
}
for (vars.i = 0; vars.i < reservesCount; vars.i++) {
if (!userConfig.isUsingAsCollateralOrBorrowing(vars.i)) {
continue;
}
vars.currentReserveAddress = reserves[vars.i];
DataTypes.ReserveData storage currentReserve = reservesData[vars.currentReserveAddress];
(vars.ltv, vars.liquidationThreshold, , vars.decimals, ) = currentReserve
.configuration
.getParams();
vars.tokenUnit = 10**vars.decimals;
vars.reserveUnitPrice = IPriceOracleGetter(oracle).getAssetPrice(vars.currentReserveAddress);
if (vars.liquidationThreshold != 0 && userConfig.isUsingAsCollateral(vars.i)) {
vars.compoundedLiquidityBalance = IERC20(currentReserve.xTokenAddress).balanceOf(user);
uint256 liquidityBalanceETH =
vars.reserveUnitPrice.mul(vars.compoundedLiquidityBalance).div(vars.tokenUnit);
vars.totalCollateralInETH = vars.totalCollateralInETH.add(liquidityBalanceETH);
vars.avgLtv = vars.avgLtv.add(liquidityBalanceETH.mul(vars.ltv));
vars.avgLiquidationThreshold = vars.avgLiquidationThreshold.add(
liquidityBalanceETH.mul(vars.liquidationThreshold)
);
}
if (userConfig.isBorrowing(vars.i)) {
vars.compoundedBorrowBalance = IERC20(currentReserve.variableDebtTokenAddress).balanceOf(
user
);
vars.totalDebtInETH = vars.totalDebtInETH.add(
vars.reserveUnitPrice.mul(vars.compoundedBorrowBalance).div(vars.tokenUnit)
);
}
}
vars.avgLtv = vars.totalCollateralInETH > 0 ? vars.avgLtv.div(vars.totalCollateralInETH) : 0;
vars.avgLiquidationThreshold = vars.totalCollateralInETH > 0
? vars.avgLiquidationThreshold.div(vars.totalCollateralInETH)
: 0;
vars.healthFactor = calculateHealthFactorFromBalances(
vars.totalCollateralInETH,
vars.totalDebtInETH,
vars.avgLiquidationThreshold
);
return (
vars.totalCollateralInETH,
vars.totalDebtInETH,
vars.avgLtv,
vars.avgLiquidationThreshold,
vars.healthFactor
);
}
/**
* @dev Calculates the health factor from the corresponding balances
* @param totalCollateralInETH The total collateral in ETH
* @param totalDebtInETH The total debt in ETH
* @param liquidationThreshold The avg liquidation threshold
* @return The health factor calculated from the balances provided
**/
function calculateHealthFactorFromBalances(
uint256 totalCollateralInETH,
uint256 totalDebtInETH,
uint256 liquidationThreshold
) internal pure returns (uint256) {
if (totalDebtInETH == 0) return uint256(-1);
return (totalCollateralInETH.percentMul(liquidationThreshold)).wadDiv(totalDebtInETH);
}
/**
* @dev Calculates the equivalent amount in ETH that an user can borrow, depending on the available collateral and the
* average Loan To Value
* @param totalCollateralInETH The total collateral in ETH
* @param totalDebtInETH The total borrow balance
* @param ltv The average loan to value
* @return the amount available to borrow in ETH for the user
**/
function calculateAvailableBorrowsETH(
uint256 totalCollateralInETH,
uint256 totalDebtInETH,
uint256 ltv
) internal pure returns (uint256) {
uint256 availableBorrowsETH = totalCollateralInETH.percentMul(ltv);
if (availableBorrowsETH < totalDebtInETH) {
return 0;
}
availableBorrowsETH = availableBorrowsETH.sub(totalDebtInETH);
return availableBorrowsETH;
}
struct AvailableCollateralToLiquidateLocalVars {
uint256 userCompoundedBorrowBalance;
uint256 liquidationBonus;
uint256 collateralPrice;
uint256 debtAssetPrice;
uint256 maxAmountCollateralToLiquidate;
uint256 debtAssetDecimals;
uint256 collateralDecimals;
}
/**
* @dev Calculates how much of a specific collateral can be liquidated, given
* a certain amount of debt asset.
* - This function needs to be called after all the checks to validate the liquidation have been performed,
* otherwise it might fail.
* @param collateralReserve The data of the collateral reserve
* @param debtReserve The data of the debt reserve
* @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
* @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
* @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
* @param userCollateralBalance The collateral balance for the specific `collateralAsset` of the user being liquidated
* @return collateralAmount: The maximum amount that is possible to liquidate given all the liquidation constraints
* (user balance, close factor)
* debtAmountNeeded: The amount to repay with the liquidation
**/
function calculateAvailableCollateralToLiquidate(
DataTypes.ReserveData storage collateralReserve,
DataTypes.ReserveData storage debtReserve,
address collateralAsset,
address debtAsset,
uint256 debtToCover,
uint256 userCollateralBalance,
address oracle
) internal view returns (uint256, uint256) {
uint256 collateralAmount = 0;
AvailableCollateralToLiquidateLocalVars memory vars;
vars.collateralPrice = IPriceOracleGetter(oracle).getAssetPrice(
collateralAsset
);
vars.debtAssetPrice = IPriceOracleGetter(oracle).getAssetPrice(
debtAsset
);
(
,
,
vars.liquidationBonus,
vars.collateralDecimals,
) = collateralReserve.configuration.getParams();
vars.debtAssetDecimals = debtReserve.configuration.getDecimals();
// This is the maximum possible amount of the selected collateral that can be liquidated, given the
// max amount of liquidatable debt
vars.maxAmountCollateralToLiquidate = vars
.debtAssetPrice
.mul(debtToCover)
.mul(10**vars.collateralDecimals)
.percentMul(vars.liquidationBonus)
.div(vars.collateralPrice.mul(10**vars.debtAssetDecimals));
if (vars.maxAmountCollateralToLiquidate > userCollateralBalance) {
collateralAmount = userCollateralBalance;
} else {
collateralAmount = vars.maxAmountCollateralToLiquidate;
}
return (
collateralAmount,
collateralAmount.percentDiv(vars.liquidationBonus)
);
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IERC20} from './IERC20.sol';
import {DataTypes} from './DataTypes.sol';
/**
* @title Helpers library
* @author Lever
*/
library Helpers {
/**
* @dev Fetches the user current variable debt balances
* @param user The user address
* @param reserve The reserve data object
* @return The variable debt balance
**/
function getUserCurrentDebt(address user, DataTypes.ReserveData storage reserve)
internal
view
returns (uint256)
{
return IERC20(reserve.variableDebtTokenAddress).balanceOf(user);
}
function getUserCurrentDebtMemory(address user, DataTypes.ReserveData memory reserve)
internal
view
returns (uint256)
{
return IERC20(reserve.variableDebtTokenAddress).balanceOf(user);
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
interface IChainlinkAggregator {
function latestAnswer() external view returns (int256);
function latestTimestamp() external view returns (uint256);
function latestRound() external view returns (uint256);
function getAnswer(uint256 roundId) external view returns (int256);
function getTimestamp(uint256 roundId) external view returns (uint256);
event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 timestamp);
event NewRound(uint256 indexed roundId, address indexed startedBy);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
interface ICreditDelegationToken {
event BorrowAllowanceDelegated(
address indexed fromUser,
address indexed toUser,
address asset,
uint256 amount
);
/**
* @dev delegates borrowing power to a user on the specific debt token
* @param delegatee the address receiving the delegated borrowing power
* @param amount the maximum amount being delegated. Delegation will still
* respect the liquidation constraints (even if delegated, a delegatee cannot
* force a delegator HF to go below 1)
**/
function approveDelegation(address delegatee, uint256 amount) external;
/**
* @dev returns the borrow allowance of the user
* @param fromUser The user to giving allowance
* @param toUser The user to give allowance to
* @return the current allowance of toUser
**/
function borrowAllowance(address fromUser, address toUser) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IERC20} from './IERC20.sol';
interface IERC20Detailed is IERC20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
contract IERC20DetailedBytes {
bytes32 public name;
bytes32 public symbol;
uint256 public decimals;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IERC20} from './IERC20.sol';
interface IERC20WithPermit is IERC20 {
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
interface IExtendedPriceAggregator {
event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 timestamp);
function getToken() external view returns (address);
function getTokenType() external view returns (uint256);
function getPlatformId() external view returns (uint256);
function getSubTokens() external view returns (address[] memory);
function latestAnswer() external view returns (int256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
import {DataTypes} from './DataTypes.sol';
interface IMarginPool {
/**
* @dev Emitted on deposit()
* @param reserve The address of the underlying asset of the reserve
* @param user The address initiating the deposit
* @param onBehalfOf The beneficiary of the deposit, receiving the xTokens
* @param amount The amount deposited
**/
event Deposit(
address indexed reserve,
address indexed user,
address indexed onBehalfOf,
uint256 amount
);
/**
* @dev Emitted on withdraw()
* @param reserve The address of the underlyng asset being withdrawn
* @param user The address initiating the withdrawal, owner of xTokens
* @param to Address that will receive the underlying
* @param amount The amount to be withdrawn
**/
event Withdraw(address indexed reserve, address indexed user, address indexed to, uint256 amount);
/**
* @dev Emitted on borrow() when debt needs to be opened
* @param reserve The address of the underlying asset being borrowed
* @param user The address of the user initiating the borrow(), receiving the funds on borrow()
* @param onBehalfOf The address that will be getting the debt
* @param amount The amount borrowed out
* @param borrowRate The numeric rate at which the user has borrowed
**/
event Borrow(
address indexed reserve,
address indexed user,
address indexed onBehalfOf,
uint256 amount,
uint256 borrowRate
);
/**
* @dev Emitted on repay()
* @param reserve The address of the underlying asset of the reserve
* @param user The beneficiary of the repayment, getting his debt reduced
* @param repayer The address of the user initiating the repay(), providing the funds
* @param amount The amount repaid
**/
event Repay(
address indexed reserve,
address indexed user,
address indexed repayer,
uint256 amount
);
/**
* @dev Emitted on swapTokensForTokens() swapTokensForClosePosition() swapWithAggregation() closeWithAggregation()
* @param user The address initiating the swap
* @param srcReserve The address of the underlying asset of the source reserve
* @param dstReserve The address of the underlying asset of the destination reserve
* @param srcAmount The amount of source reserve
* @param dstAmount The amount of destination reserve
**/
event Swap(
address indexed user,
address indexed srcReserve,
address indexed dstReserve,
uint256 srcAmount,
uint256 dstAmount
);
/**
* @dev Emitted on setUserUseReserveAsCollateral()
* @param reserve The address of the underlying asset of the reserve
* @param user The address of the user enabling the usage as collateral
**/
event ReserveUsedAsCollateralEnabled(address indexed reserve, address indexed user);
/**
* @dev Emitted on setUserUseReserveAsCollateral()
* @param reserve The address of the underlying asset of the reserve
* @param user The address of the user enabling the usage as collateral
**/
event ReserveUsedAsCollateralDisabled(address indexed reserve, address indexed user);
/**
* @dev Emitted when the pause is triggered.
*/
event Paused();
/**
* @dev Emitted when the pause is lifted.
*/
event Unpaused();
/**
* @dev Emitted when a borrower is liquidated. This event is emitted by the MarginPool via
* MarginPoolCollateral manager using a DELEGATECALL
* This allows to have the events in the generated ABI for MarginPool.
* @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
* @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
* @param user The address of the borrower getting liquidated
* @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
* @param liquidatedCollateralAmount The amount of collateral received by the liiquidator
* @param liquidator The address of the liquidator
**/
event LiquidationCall(
address indexed collateralAsset,
address indexed debtAsset,
address indexed user,
uint256 debtToCover,
uint256 liquidatedCollateralAmount,
address liquidator
);
/**
* @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared
* in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal,
* the event will actually be fired by the MarginPool contract. The event is therefore replicated here so it
* gets added to the MarginPool ABI
* @param reserve The address of the underlying asset of the reserve
* @param liquidityRate The new liquidity rate
* @param variableBorrowRate The new variable borrow rate
* @param liquidityIndex The new liquidity index
* @param variableBorrowIndex The new variable borrow index
**/
event ReserveDataUpdated(
address indexed reserve,
uint256 liquidityRate,
uint256 variableBorrowRate,
uint256 liquidityIndex,
uint256 variableBorrowIndex
);
/**
* @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying xTokens.
* - E.g. User deposits 100 USDC and gets in return 100 xUSDC
* @param asset The address of the underlying asset to deposit
* @param amount The amount to be deposited
* @param onBehalfOf The address that will receive the xTokens, same as msg.sender if the user
* wants to receive them on his own wallet, or a different address if the beneficiary of xTokens
* is a different wallet
**/
function deposit(
address asset,
uint256 amount,
address onBehalfOf
) external;
/**
* @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent xTokens owned
* E.g. User has 100 xUSDC, calls withdraw() and receives 100 USDC, burning the 100 xUSDC
* @param asset The address of the underlying asset to withdraw
* @param amount The underlying amount to be withdrawn
* - Send the value type(uint256).max in order to withdraw the whole xToken balance
* @param to Address that will receive the underlying, same as msg.sender if the user
* wants to receive it on his own wallet, or a different address if the beneficiary is a
* different wallet
* @return The final amount withdrawn
**/
function withdraw(
address asset,
uint256 amount,
address to
) external returns (uint256);
/**
* @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
* already deposited enough collateral, or he was given enough allowance by a credit delegator on the
* corresponding debt token ( VariableDebtToken)
* - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet
* and 100 variable debt tokens
* @param asset The address of the underlying asset to borrow
* @param amount The amount to be borrowed
* @param onBehalfOf Address of the user who will receive the debt. Should be the address of the borrower itself
* calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
* if he has been given credit delegation allowance
**/
function borrow(
address asset,
uint256 amount,
address onBehalfOf
) external;
/**
* @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned
* - E.g. User repays 100 USDC, burning 100 variable debt tokens of the `onBehalfOf` address
* @param asset The address of the borrowed underlying asset previously borrowed
* @param amount The amount to repay
* - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
* @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
* user calling the function if he wants to reduce/remove his own debt, or the address of any other
* other borrower whose debt should be removed
* @return The final amount repaid
**/
function repay(
address asset,
uint256 amount,
address onBehalfOf
) external returns (uint256);
function swapTokensForTokens(
uint256 amountIn,
uint256 amountOut,
address[] calldata path,
bool isExactIn,
bool isUni
) external;
function swapTokensForClosePosition(
uint256 amountIn,
uint256 amountOut,
address[] calldata path,
bool isExactIn,
bool isUni
) external;
/**
* @dev Allows depositors to enable/disable a specific deposited asset as collateral
* @param asset The address of the underlying asset deposited
* @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise
**/
function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external;
/**
* @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1
* - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives
* a proportionally amount of the `collateralAsset` plus a bonus to cover market risk
* @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
* @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
* @param user The address of the borrower getting liquidated
* @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
**/
function liquidationCall(
address collateralAsset,
address debtAsset,
address user,
uint256 debtToCover
) external;
/**
* @dev Returns the user account data across all the reserves
* @param user The address of the user
* @return totalCollateralETH the total collateral in ETH of the user
* @return totalDebtETH the total debt in ETH of the user
* @return availableBorrowsETH the borrowing power left of the user
* @return currentLiquidationThreshold the liquidation threshold of the user
* @return ltv the loan to value of the user
* @return healthFactor the current health factor of the user
**/
function getUserAccountData(address user)
external
view
returns (
uint256 totalCollateralETH,
uint256 totalDebtETH,
uint256 availableBorrowsETH,
uint256 currentLiquidationThreshold,
uint256 ltv,
uint256 healthFactor
);
function initReserve(
address reserve,
address xTokenAddress,
address variableDebtAddress,
address interestRateStrategyAddress
) external;
function setReserveInterestRateStrategyAddress(address reserve, address rateStrategyAddress)
external;
function setConfiguration(address reserve, uint256 configuration) external;
/**
* @dev Returns the configuration of the reserve
* @param asset The address of the underlying asset of the reserve
* @return The configuration of the reserve
**/
function getConfiguration(address asset)
external
view
returns (DataTypes.ReserveConfigurationMap memory);
/**
* @dev Returns the configuration of the user across all the reserves
* @param user The user address
* @return The configuration of the user
**/
function getUserConfiguration(address user)
external
view
returns (DataTypes.UserConfigurationMap memory);
/**
* @dev Returns the normalized income normalized income of the reserve
* @param asset The address of the underlying asset of the reserve
* @return The reserve's normalized income
*/
function getReserveNormalizedIncome(address asset) external view returns (uint256);
/**
* @dev Returns the normalized variable debt per unit of asset
* @param asset The address of the underlying asset of the reserve
* @return The reserve normalized variable debt
*/
function getReserveNormalizedVariableDebt(address asset) external view returns (uint256);
/**
* @dev Returns the state and configuration of the reserve
* @param asset The address of the underlying asset of the reserve
* @return The state of the reserve
**/
function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);
function finalizeTransfer(
address asset,
address from,
address to,
uint256 amount,
uint256 balanceFromAfter,
uint256 balanceToBefore
) external;
function getReservesList() external view returns (address[] memory);
function getAddressesProvider() external view returns (IMarginPoolAddressesProvider);
function setPause(bool val) external;
function paused() external view returns (bool);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/**
* @title MarginPoolAddressesProvider contract
* @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
* - Acting also as factory of proxies and admin of those, so with right to change its implementations
* - Owned by the Lever Governance
* @author Lever
**/
interface IMarginPoolAddressesProvider {
event MarginPoolUpdated(address indexed newAddress);
event ConfigurationAdminUpdated(address indexed newAddress);
event EmergencyAdminUpdated(address indexed newAddress);
event MarginPoolConfiguratorUpdated(address indexed newAddress);
event MarginPoolCollateralManagerUpdated(address indexed newAddress);
event PriceOracleUpdated(address indexed newAddress);
event ProxyCreated(bytes32 id, address indexed newAddress);
event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy);
event LeverTokenUpdated(address indexed newAddress);
event TreasuryAddressUpdated(address indexed newAddress);
event RewardsDistributionUpdated(address indexed newAddress);
event OrderBookUpdated(address indexed newAddress);
event SwapMinerUpdated(address indexed newAddress);
function setAddress(bytes32 id, address newAddress) external;
function setAddressAsProxy(bytes32 id, address impl) external;
function getAddress(bytes32 id) external view returns (address);
function getMarginPool() external view returns (address);
function setMarginPoolImpl(address pool, address UniswapRouter,address SushiswapRouter, address weth) external;
function getMarginPoolConfigurator() external view returns (address);
function setMarginPoolConfiguratorImpl(address configurator) external;
function getPoolAdmin() external view returns (address);
function setPoolAdmin(address admin) external;
function getEmergencyAdmin() external view returns (address);
function setEmergencyAdmin(address admin) external;
function getPriceOracle() external view returns (address);
function setPriceOracle(address priceOracle) external;
function getLeverToken() external view returns (address);
function setLeverToken(address lever) external;
function getTreasuryAddress() external view returns (address);
function setTreasuryAddress(address treasuryAddress) external;
function getRewardsDistribution() external view returns (address);
function setRewardsDistribution(address rewardsDistribution) external;
function getOrderBook() external view returns (address);
function setOrderBookImpl(address addressProvider, address UniswapRouter, address weth) external;
function getSwapMiner() external view returns (address);
function setSwapMinerImpl(address _swapMiner, address UniswapRouter, address _uniswapLevPairToken, address LeverUsdOracle) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {Context} from './Context.sol';
import {IERC20} from './IERC20.sol';
import {IERC20Detailed} from './IERC20Detailed.sol';
import {SafeMath} from './SafeMath.sol';
/**
* @title ERC20
* @notice Basic ERC20 implementation
* @author Lever, inspired by the Openzeppelin ERC20 implementation
**/
contract IncentivizedERC20 is Context, IERC20, IERC20Detailed {
using SafeMath for uint256;
mapping(address => uint256) internal _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 internal _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
constructor(
string memory name,
string memory symbol,
uint8 decimals
) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @return The name of the token
**/
function name() public view override returns (string memory) {
return _name;
}
/**
* @return The symbol of the token
**/
function symbol() public view override returns (string memory) {
return _symbol;
}
/**
* @return The decimals of the token
**/
function decimals() public view override returns (uint8) {
return _decimals;
}
/**
* @return The total supply of the token
**/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @return The balance of the token
**/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev Executes a transfer of tokens from _msgSender() to recipient
* @param recipient The recipient of the tokens
* @param amount The amount of tokens being transferred
* @return `true` if the transfer succeeds, `false` otherwise
**/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
emit Transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev Returns the allowance of spender on the tokens owned by owner
* @param owner The owner of the tokens
* @param spender The user allowed to spend the owner's tokens
* @return The amount of owner's tokens spender is allowed to spend
**/
function allowance(address owner, address spender)
public
view
virtual
override
returns (uint256)
{
return _allowances[owner][spender];
}
/**
* @dev Allows `spender` to spend the tokens owned by _msgSender()
* @param spender The user allowed to spend _msgSender() tokens
* @return `true`
**/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev Executes a transfer of token from sender to recipient, if _msgSender() is allowed to do so
* @param sender The owner of the tokens
* @param recipient The recipient of the tokens
* @param amount The amount of tokens being transferred
* @return `true` if the transfer succeeds, `false` otherwise
**/
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(
sender,
_msgSender(),
_allowances[sender][_msgSender()].sub(amount, 'ERC20: transfer amount exceeds allowance')
);
emit Transfer(sender, recipient, amount);
return true;
}
/**
* @dev Increases the allowance of spender to spend _msgSender() tokens
* @param spender The user allowed to spend on behalf of _msgSender()
* @param addedValue The amount being added to the allowance
* @return `true`
**/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Decreases the allowance of spender to spend _msgSender() tokens
* @param spender The user allowed to spend on behalf of _msgSender()
* @param subtractedValue The amount being subtracted to the allowance
* @return `true`
**/
function decreaseAllowance(address spender, uint256 subtractedValue)
public
virtual
returns (bool)
{
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].sub(
subtractedValue,
'ERC20: decreased allowance below zero'
)
);
return true;
}
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), 'ERC20: transfer from the zero address');
require(recipient != address(0), 'ERC20: transfer to the zero address');
_beforeTokenTransfer(sender, recipient, amount);
uint256 oldSenderBalance = _balances[sender];
_balances[sender] = oldSenderBalance.sub(amount, 'ERC20: transfer amount exceeds balance');
_balances[recipient] = _balances[recipient].add(amount);
}
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), 'ERC20: mint to the zero address');
_beforeTokenTransfer(address(0), account, amount);
uint256 oldTotalSupply = _totalSupply;
_totalSupply = oldTotalSupply.add(amount);
uint256 oldAccountBalance = _balances[account];
_balances[account] = oldAccountBalance.add(amount);
}
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), 'ERC20: burn from the zero address');
_beforeTokenTransfer(account, address(0), amount);
uint256 oldTotalSupply = _totalSupply;
_totalSupply = oldTotalSupply.sub(amount);
uint256 oldAccountBalance = _balances[account];
_balances[account] = oldAccountBalance.sub(amount, 'ERC20: burn amount exceeds balance');
}
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), 'ERC20: approve from the zero address');
require(spender != address(0), 'ERC20: approve to the zero address');
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _setName(string memory newName) internal {
_name = newName;
}
function _setSymbol(string memory newSymbol) internal {
_symbol = newSymbol;
}
function _setDecimals(uint8 newDecimals) internal {
_decimals = newDecimals;
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity >=0.4.24 <0.7.0;
/**
* @title Initializable
*
* @dev Helper contract to support initializer functions. To use it, replace
* the constructor with a function that has the `initializer` modifier.
* WARNING: Unlike constructors, initializer functions must be manually
* invoked. This applies both to deploying an Initializable contract, as well
* as extending an Initializable contract via inheritance.
* WARNING: When used with inheritance, manual care must be taken to not invoke
* a parent initializer twice, or ensure that all initializers are idempotent,
* because this is not dealt with automatically as with constructors.
*/
contract Initializable {
/**
* @dev Indicates that the contract has been initialized.
*/
bool private initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private initializing;
/**
* @dev Modifier to use in the initializer function of a contract.
*/
modifier initializer() {
require(
initializing || isConstructor() || !initialized,
'Contract instance has already been initialized'
);
bool isTopLevelCall = !initializing;
if (isTopLevelCall) {
initializing = true;
initialized = true;
}
_;
if (isTopLevelCall) {
initializing = false;
}
}
/// @dev Returns true if and only if the function is running in the constructor
function isConstructor() private view returns (bool) {
// extcodesize checks the size of the code stored in an address, and
// address returns the current address. Since the code is still not
// deployed when running a constructor, any checks on its code size will
// yield zero, making it an effective way to detect if a contract is
// under construction or not.
uint256 cs;
//solium-disable-next-line
assembly {
cs := extcodesize(address())
}
return cs == 0;
}
// Reserved storage space to allow for layout changes in the future.
uint256[50] private ______gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import './BaseAdminUpgradeabilityProxy.sol';
import './InitializableUpgradeabilityProxy.sol';
/**
* @title InitializableAdminUpgradeabilityProxy
* @dev Extends from BaseAdminUpgradeabilityProxy with an initializer for
* initializing the implementation, admin, and init data.
*/
contract InitializableAdminUpgradeabilityProxy is
BaseAdminUpgradeabilityProxy,
InitializableUpgradeabilityProxy
{
/**
* Contract initializer.
* @param logic address of the initial implementation.
* @param admin Address of the proxy administrator.
* @param data Data to send as msg.data to the implementation to initialize the proxied contract.
* It should include the signature and the parameters of the function to be called, as described in
* https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
* This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
*/
function initialize(
address logic,
address admin,
bytes memory data
) public payable {
require(_implementation() == address(0),"_implementation() != address(0)");
InitializableUpgradeabilityProxy.initialize(logic, data);
assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1));
_setAdmin(admin);
}
/**
* @dev Only fall back when the sender is not the admin.
*/
function _willFallback() internal override(BaseAdminUpgradeabilityProxy, Proxy) {
BaseAdminUpgradeabilityProxy._willFallback();
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import './BaseImmutableAdminUpgradeabilityProxy.sol';
import './InitializableUpgradeabilityProxy.sol';
/**
* @title InitializableAdminUpgradeabilityProxy
* @dev Extends BaseAdminUpgradeabilityProxy with an initializer function
*/
contract InitializableImmutableAdminUpgradeabilityProxy is
BaseImmutableAdminUpgradeabilityProxy,
InitializableUpgradeabilityProxy
{
constructor(address admin) public BaseImmutableAdminUpgradeabilityProxy(admin) {}
/**
* @dev Only fall back when the sender is not the admin.
*/
function _willFallback() internal override(BaseImmutableAdminUpgradeabilityProxy, Proxy) {
BaseImmutableAdminUpgradeabilityProxy._willFallback();
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import './BaseUpgradeabilityProxy.sol';
/**
* @title InitializableUpgradeabilityProxy
* @dev Extends BaseUpgradeabilityProxy with an initializer for initializing
* implementation and init data.
*/
contract InitializableUpgradeabilityProxy is BaseUpgradeabilityProxy {
/**
* @dev Contract initializer.
* @param _logic Address of the initial implementation.
* @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
* It should include the signature and the parameters of the function to be called, as described in
* https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
* This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
*/
function initialize(address _logic, bytes memory _data) public payable {
require(_implementation() == address(0),"_implementation error!");
assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1));
_setImplementation(_logic);
if (_data.length > 0) {
(bool success, ) = _logic.delegatecall(_data);
require(success,"_logic.delegatecall error!");
}
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/************
@title IPriceOracle interface
@notice Interface for the Lever price oracle.*/
interface IPriceOracle {
/***********
@dev returns the asset price in ETH
*/
function getAssetPrice(address asset) external view returns (uint256);
/***********
@dev sets the asset price, in wei
*/
function setAssetPrice(address asset, uint256 price) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/**
* @title IPriceOracleGetter interface
* @notice Interface for the Lever price oracle.
**/
interface IPriceOracleGetter {
/**
* @dev returns the asset price in ETH
* @param asset the address of the asset
* @return the ETH price of the asset
**/
function getAssetPrice(address asset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/**
* @title IReserveInterestRateStrategyInterface interface
* @dev Interface for the calculation of the interest rates
* @author Lever
*/
interface IReserveInterestRateStrategy {
function baseVariableBorrowRate() external view returns (uint256);
function getMaxVariableBorrowRate() external view returns (uint256);
function calculateInterestRates(
uint256 utilizationRate,
uint256 totalVariableDebt,
uint256 reserveFactor
)
external
view
returns (
uint256 liquidityRate,
uint256 variableBorrowRate
);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
interface IScaledBalanceToken {
/**
* @dev Returns the scaled balance of the user. The scaled balance is the sum of all the
* updated stored balance divided by the reserve's liquidity index at the moment of the update
* @param user The user whose balance is calculated
* @return The scaled balance of the user
**/
function scaledBalanceOf(address user) external view returns (uint256);
/**
* @dev Returns the scaled balance of the user and the scaled total supply.
* @param user The address of the user
* @return The scaled balance of the user
* @return The scaled balance and the scaled total supply
**/
function getScaledUserBalanceAndSupply(address user) external view returns (uint256, uint256);
/**
* @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
* @return The scaled total supply
**/
function scaledTotalSupply() external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.6.12;
/**
* @title ITokenConfiguration
* @author Lever
* @dev Common interface between xTokens and debt tokens to fetch the
* token configuration
**/
interface ITokenConfiguration {
function UNDERLYING_ASSET_ADDRESS() external view returns (address);
function POOL() external view returns (address);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity >=0.6.2;
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
)
external
returns (
uint256 amountA,
uint256 amountB,
uint256 liquidity
);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
external
payable
returns (
uint256 amountToken,
uint256 amountETH,
uint256 liquidity
);
function removeLiquidity(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETH(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountToken, uint256 amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETHWithPermit(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountToken, uint256 amountETH);
function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapTokensForExactTokens(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function swapTokensForExactETH(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) external pure returns (uint256 amountB);
function getAmountOut(
uint256 amountIn,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountOut);
function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountIn);
function getAmountsOut(uint256 amountIn, address[] calldata path)
external
view
returns (uint256[] memory amounts);
function getAmountsIn(uint256 amountOut, address[] calldata path)
external
view
returns (uint256[] memory amounts);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IScaledBalanceToken} from './IScaledBalanceToken.sol';
/**
* @title IVariableDebtToken
* @author Lever
* @notice Defines the basic interface for a variable debt token.
**/
interface IVariableDebtToken is IScaledBalanceToken {
/**
* @dev Emitted after the mint action
* @param from The address performing the mint
* @param onBehalfOf The address of the user on which behalf minting has been performed
* @param value The amount to be minted
* @param index The last index of the reserve
**/
event Mint(address indexed from, address indexed onBehalfOf, uint256 value, uint256 index);
/**
* @dev Mints debt token to the `onBehalfOf` address
* @param user The address receiving the borrowed underlying, being the delegatee in case
* of credit delegate, or same as `onBehalfOf` otherwise
* @param onBehalfOf The address receiving the debt tokens
* @param amount The amount of debt being minted
* @param index The variable debt index of the reserve
* @return `true` if the the previous balance of the user is 0
**/
function mint(
address user,
address onBehalfOf,
uint256 amount,
uint256 index
) external returns (bool);
/**
* @dev Emitted when variable debt is burnt
* @param user The user which debt has been burned
* @param amount The amount of debt being burned
* @param index The index of the user
**/
event Burn(address indexed user, uint256 amount, uint256 index);
/**
* @dev Burns user variable debt
* @param user The user which debt is burnt
* @param index The variable debt index of the reserve
**/
function burn(
address user,
uint256 amount,
uint256 index
) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
interface IWETH {
function deposit() external payable;
function withdraw(uint256) external;
function approve(address guy, uint256 wad) external returns (bool);
function transferFrom(
address src,
address dst,
uint256 wad
) external returns (bool);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
interface IWETHGateway {
function depositETH(address onBehalfOf) external payable;
function withdrawETH(uint256 amount, address onBehalfOf) external;
function borrowETH(
uint256 amount
) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IERC20} from './IERC20.sol';
import {IScaledBalanceToken} from './IScaledBalanceToken.sol';
interface IXToken is IERC20, IScaledBalanceToken {
/**
* @dev Emitted after the mint action
* @param from The address performing the mint
* @param value The amount being
* @param index The new liquidity index of the reserve
**/
event Mint(address indexed from, uint256 value, uint256 index);
/**
* @dev Mints `amount` xTokens to `user`
* @param user The address receiving the minted tokens
* @param amount The amount of tokens getting minted
* @param index The new liquidity index of the reserve
* @return `true` if the the previous balance of the user was 0
*/
function mint(
address user,
uint256 amount,
uint256 index
) external returns (bool);
/**
* @dev Emitted after xTokens are burned
* @param from The owner of the xTokens, getting them burned
* @param target The address that will receive the underlying
* @param value The amount being burned
* @param index The new liquidity index of the reserve
**/
event Burn(address indexed from, address indexed target, uint256 value, uint256 index);
/**
* @dev Emitted during the transfer action
* @param from The user whose tokens are being transferred
* @param to The recipient
* @param value The amount being transferred
* @param index The new liquidity index of the reserve
**/
event BalanceTransfer(address indexed from, address indexed to, uint256 value, uint256 index);
/**
* @dev Burns xTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
* @param user The owner of the xTokens, getting them burned
* @param receiverOfUnderlying The address that will receive the underlying
* @param amount The amount being burned
* @param index The new liquidity index of the reserve
**/
function burn(
address user,
address receiverOfUnderlying,
uint256 amount,
uint256 index
) external;
/**
* @dev Mints xTokens to the reserve treasury
* @param amount The amount of tokens getting minted
* @param index The new liquidity index of the reserve
*/
function mintToTreasury(uint256 amount, uint256 index) external;
/**
* @dev Transfers xTokens in the event of a borrow being liquidated, in case the liquidators reclaims the xToken
* @param from The address getting liquidated, current owner of the xTokens
* @param to The recipient
* @param value The amount of tokens getting transferred
**/
function transferOnLiquidation(
address from,
address to,
uint256 value
) external;
/**
* @dev Transfers the underlying asset to `target`. Used by the MarginPool to transfer
* assets in borrow(), withdraw() and flashLoan()
* @param user The recipient of the xTokens
* @param amount The amount getting transferred
* @return The amount transferred
**/
function transferUnderlyingTo(address user, uint256 amount) external returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {Ownable} from './Ownable.sol';
import {IERC20} from './IERC20.sol';
import {IPriceOracleGetter} from './IPriceOracleGetter.sol';
import {IChainlinkAggregator} from './IChainlinkAggregator.sol';
import {SafeERC20} from './SafeERC20.sol';
/// @title LeverOracle
/// @author Lever
/// @notice Proxy smart contract to get the price of an asset from a price source, with Chainlink Aggregator
/// smart contracts as primary option
/// - If the returned price by a Chainlink aggregator is <= 0, the call is forwarded to a fallbackOracle
/// - Owned by the Lever governance system, allowed to add sources for assets, replace them
/// and change the fallbackOracle
contract LeverOracle is IPriceOracleGetter, Ownable {
using SafeERC20 for IERC20;
event WethSet(address indexed weth);
event AssetSourceUpdated(address indexed asset, address indexed source);
event FallbackOracleUpdated(address indexed fallbackOracle);
mapping(address => IChainlinkAggregator) private assetsSources;
IPriceOracleGetter private _fallbackOracle;
address public immutable WETH;
/// @notice Constructor
/// @param assets The addresses of the assets
/// @param sources The address of the source of each asset
/// @param fallbackOracle The address of the fallback oracle to use if the data of an
/// aggregator is not consistent
constructor(
address[] memory assets,
address[] memory sources,
address fallbackOracle,
address weth
) public {
_setFallbackOracle(fallbackOracle);
_setAssetsSources(assets, sources);
WETH = weth;
emit WethSet(weth);
}
/// @notice External function called by the Lever governance to set or replace sources of assets
/// @param assets The addresses of the assets
/// @param sources The address of the source of each asset
function setAssetSources(address[] calldata assets, address[] calldata sources)
external
onlyOwner
{
_setAssetsSources(assets, sources);
}
/// @notice Sets the fallbackOracle
/// - Callable only by the Lever governance
/// @param fallbackOracle The address of the fallbackOracle
function setFallbackOracle(address fallbackOracle) external onlyOwner {
_setFallbackOracle(fallbackOracle);
}
/// @notice Internal function to set the sources for each asset
/// @param assets The addresses of the assets
/// @param sources The address of the source of each asset
function _setAssetsSources(address[] memory assets, address[] memory sources) internal {
require(assets.length == sources.length, 'INCONSISTENT_PARAMS_LENGTH');
for (uint256 i = 0; i < assets.length; i++) {
assetsSources[assets[i]] = IChainlinkAggregator(sources[i]);
emit AssetSourceUpdated(assets[i], sources[i]);
}
}
/// @notice Internal function to set the fallbackOracle
/// @param fallbackOracle The address of the fallbackOracle
function _setFallbackOracle(address fallbackOracle) internal {
_fallbackOracle = IPriceOracleGetter(fallbackOracle);
emit FallbackOracleUpdated(fallbackOracle);
}
/// @notice Gets an asset price by address
/// @param asset The asset address
function getAssetPrice(address asset) public view override returns (uint256) {
IChainlinkAggregator source = assetsSources[asset];
if (asset == WETH) {
return 1 ether;
} else if (address(source) == address(0)) {
return _fallbackOracle.getAssetPrice(asset);
} else {
int256 price = IChainlinkAggregator(source).latestAnswer();
if (price > 0) {
return uint256(price);
} else {
return _fallbackOracle.getAssetPrice(asset);
}
}
}
/// @notice Gets a list of prices from a list of assets addresses
/// @param assets The list of assets addresses
function getAssetsPrices(address[] calldata assets) external view returns (uint256[] memory) {
uint256[] memory prices = new uint256[](assets.length);
for (uint256 i = 0; i < assets.length; i++) {
prices[i] = getAssetPrice(assets[i]);
}
return prices;
}
/// @notice Gets the address of the source for an asset address
/// @param asset The address of the asset
/// @return address The address of the source
function getSourceOfAsset(address asset) external view returns (address) {
return address(assetsSources[asset]);
}
/// @notice Gets the address of the fallback oracle
/// @return address The addres of the fallback oracle
function getFallbackOracle() external view returns (address) {
return address(_fallbackOracle);
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import {SafeMath} from "./SafeMath.sol";
import {IERC20} from "./IERC20.sol";
import {SafeERC20} from "./SafeERC20.sol";
import {Address} from "./Address.sol";
import {IMarginPoolAddressesProvider} from "./IMarginPoolAddressesProvider.sol";
import {IXToken} from "./IXToken.sol";
import {IVariableDebtToken} from "./IVariableDebtToken.sol";
import {IPriceOracleGetter} from "./IPriceOracleGetter.sol";
import {IMarginPool} from "./IMarginPool.sol";
import {VersionedInitializable} from "./VersionedInitializable.sol";
import {Helpers} from "./Helpers.sol";
import {Errors} from "./Errors.sol";
import {WadRayMath} from "./WadRayMath.sol";
import {PercentageMath} from "./PercentageMath.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {ValidationLogic} from "./ValidationLogic.sol";
import {ReserveConfiguration} from "./ReserveConfiguration.sol";
import {UserConfiguration} from "./UserConfiguration.sol";
import {DataTypes} from "./DataTypes.sol";
import {MarginPoolStorage} from "./MarginPoolStorage.sol";
import {IUniswapV2Router02} from "./IUniswapV2Router02.sol";
interface ISwapMining {
function swapMint(
address account,
address input,
address output,
uint256 amount
) external returns (bool);
}
/**
* @title MarginPool contract
* @dev Main point of interaction with an Lever protocol's market
* - Users can:
* # Deposit
* # Withdraw
* # Borrow
* # Repay
* # Liquidate positions
* - To be covered by a proxy contract, owned by the MarginPoolAddressesProvider of the specific market
* - All admin functions are callable by the MarginPoolConfigurator contract defined also in the
* MarginPoolAddressesProvider
* @author Lever
**/
contract MarginPool is VersionedInitializable, IMarginPool, MarginPoolStorage {
using SafeMath for uint256;
using WadRayMath for uint256;
using PercentageMath for uint256;
using SafeERC20 for IERC20;
//main configuration parameters
uint256 public constant MAX_NUMBER_RESERVES = 128;
uint256 public constant MARGINPOOL_REVISION = 0x1;
IUniswapV2Router02 public uniswaper;
IUniswapV2Router02 public sushiSwaper;
address public wethAddress;
address public constant inchor = 0x11111112542D85B3EF69AE05771c2dCCff4fAa26;
modifier whenNotPaused() {
_whenNotPaused();
_;
}
modifier onlyMarginPoolConfigurator() {
_onlyMarginPoolConfigurator();
_;
}
function _whenNotPaused() internal view {
require(!_paused, Errors.MP_IS_PAUSED);
}
function _onlyMarginPoolConfigurator() internal view {
require(
_addressesProvider.getMarginPoolConfigurator() == msg.sender,
Errors.MP_CALLER_NOT_MARGIN_POOL_CONFIGURATOR
);
}
function getRevision() internal pure override returns (uint256) {
return MARGINPOOL_REVISION;
}
/**
* @dev Function is invoked by the proxy contract when the MarginPool contract is added to the
* MarginPoolAddressesProvider of the market.
* - Caching the address of the MarginPoolAddressesProvider in order to reduce gas consumption
* on subsequent operations
* @param provider The address of the MarginPoolAddressesProvider
**/
function initialize(
IMarginPoolAddressesProvider provider,
IUniswapV2Router02 _uniswaper,
IUniswapV2Router02 _sushiSwaper,
address _weth
) public initializer {
_addressesProvider = provider;
uniswaper = _uniswaper;
sushiSwaper = _sushiSwaper;
wethAddress = _weth;
}
/**
* @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying xTokens.
* - E.g. User deposits 100 USDC and gets in return 100 xUSDC
* @param asset The address of the underlying asset to deposit
* @param amount The amount to be deposited
* @param onBehalfOf The address that will receive the xTokens, same as msg.sender if the user
* wants to receive them on his own wallet, or a different address if the beneficiary of xTokens
* is a different wallet
**/
function deposit(
address asset,
uint256 amount,
address onBehalfOf
) external override whenNotPaused {
DataTypes.ReserveData storage reserve = _reserves[asset];
ValidationLogic.validateDeposit(reserve, amount);
address xToken = reserve.xTokenAddress;
reserve.updateState();
reserve.updateInterestRates(asset, xToken, amount, 0);
IERC20(asset).safeTransferFrom(msg.sender, xToken, amount);
_depositLogic(asset, amount, onBehalfOf, xToken, reserve);
}
function reDeposit(
address asset,
uint256 amount,
address onBehalfOf
) internal whenNotPaused {
DataTypes.ReserveData storage reserve = _reserves[asset];
ValidationLogic.validateDeposit(reserve, amount);
address xToken = reserve.xTokenAddress;
reserve.updateState();
reserve.updateInterestRates(asset, xToken, amount, 0);
IERC20(asset).safeTransfer(xToken, amount);
_depositLogic(asset, amount, onBehalfOf, xToken, reserve);
}
function _depositLogic(
address asset,
uint256 amount,
address onBehalfOf,
address xToken,
DataTypes.ReserveData storage reserve
) internal {
uint256 variableDebt = Helpers.getUserCurrentDebt(onBehalfOf, reserve);
if (variableDebt > 0) {
uint256 paybackAmount = variableDebt;
if (amount < paybackAmount) {
paybackAmount = amount;
}
IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
onBehalfOf,
paybackAmount,
reserve.variableBorrowIndex
);
emit Repay(asset, onBehalfOf, msg.sender, paybackAmount);
if (variableDebt == paybackAmount) {
_usersConfig[onBehalfOf].setBorrowing(reserve.id, false);
}
if (amount > paybackAmount) {
bool isFirstDeposit =
IXToken(xToken).mint(
onBehalfOf,
amount.sub(paybackAmount),
reserve.liquidityIndex
);
if (isFirstDeposit) {
_usersConfig[onBehalfOf].setUsingAsCollateral(
reserve.id,
true
);
emit ReserveUsedAsCollateralEnabled(asset, onBehalfOf);
}
emit Deposit(
asset,
msg.sender,
onBehalfOf,
amount.sub(paybackAmount)
);
}
} else {
bool isFirstDeposit =
IXToken(xToken).mint(
onBehalfOf,
amount,
reserve.liquidityIndex
);
if (isFirstDeposit) {
_usersConfig[onBehalfOf].setUsingAsCollateral(reserve.id, true);
emit ReserveUsedAsCollateralEnabled(asset, onBehalfOf);
}
emit Deposit(asset, msg.sender, onBehalfOf, amount);
}
}
/**
* @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent xTokens owned
* E.g. User has 100 xUSDC, calls withdraw() and receives 100 USDC, burning the 100 xUSDC
* @param asset The address of the underlying asset to withdraw
* @param amount The underlying amount to be withdrawn
* - Send the value type(uint256).max in order to withdraw the whole xToken balance
* @param to Address that will receive the underlying, same as msg.sender if the user
* wants to receive it on his own wallet, or a different address if the beneficiary is a
* different wallet
* @return The final amount withdrawn
**/
function withdraw(
address asset,
uint256 amount,
address to
) external override whenNotPaused returns (uint256) {
DataTypes.ReserveData storage reserve = _reserves[asset];
address xToken = reserve.xTokenAddress;
uint256 userBalance = IXToken(xToken).balanceOf(msg.sender);
uint256 amountToWithdraw = amount;
if (amount == type(uint256).max) {
amountToWithdraw = userBalance;
}
ValidationLogic.validateWithdraw(
asset,
amountToWithdraw,
userBalance,
_reserves,
_usersConfig[msg.sender],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
reserve.updateState();
reserve.updateInterestRates(asset, xToken, 0, amountToWithdraw);
if (amountToWithdraw == userBalance) {
_usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
}
IXToken(xToken).burn(
msg.sender,
to,
amountToWithdraw,
reserve.liquidityIndex
);
emit Withdraw(asset, msg.sender, to, amountToWithdraw);
return amountToWithdraw;
}
/**
* @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
* already deposited enough collateral, or he was given enough allowance by a credit delegator on the
* corresponding debt token ( VariableDebtToken)
* - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet
* and 100 variable debt tokens
* @param asset The address of the underlying asset to borrow
* @param amount The amount to be borrowed
* @param onBehalfOf Address of the user who will receive the debt. Should be the address of the borrower itself
* calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
* if he has been given credit delegation allowance
**/
function borrow(
address asset,
uint256 amount,
address onBehalfOf
) external override whenNotPaused {
DataTypes.ReserveData storage reserve = _reserves[asset];
_executeBorrow(
ExecuteBorrowParams(
asset,
msg.sender,
onBehalfOf,
amount,
reserve.xTokenAddress,
true
)
);
}
function swapTokensForTokens(
uint256 amountIn,
uint256 amountOut,
address[] calldata path,
bool isExactIn,
bool isUni
) external override whenNotPaused {
_beforeSwap(path[0], amountIn);
IUniswapV2Router02 swaper = isUni ? uniswaper : sushiSwaper;
// Approves the transfer for the swap. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix.
IERC20(path[0]).safeApprove(address(swaper), 0);
IERC20(path[0]).safeApprove(address(swaper), amountIn);
uint256[] memory awards;
if (isExactIn) {
awards = swaper.swapExactTokensForTokens(
amountIn,
amountOut,
path,
address(this),
block.timestamp
);
} else {
awards = swaper.swapTokensForExactTokens(
amountOut,
amountIn,
path,
address(this),
block.timestamp
);
}
reDeposit(path[path.length - 1], awards[awards.length - 1], msg.sender);
if (amountIn > awards[0]) {
reDeposit(path[0], amountIn.sub(awards[0]), msg.sender);
}
ValidationLogic.validateSwap(
msg.sender,
_reserves,
_usersConfig[msg.sender],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
ISwapMining(_addressesProvider.getSwapMiner()).swapMint(
msg.sender,
path[0],
path[path.length - 1],
awards[awards.length - 1]
);
emit Swap(
msg.sender,
path[0],
path[path.length - 1],
awards[0],
awards[awards.length - 1]
);
}
function swapTokensForClosePosition(
uint256 amountIn,
uint256 amountOut,
address[] calldata path,
bool isExactIn,
bool isUni
) external override whenNotPaused {
_beforeClose(path[0], amountIn);
IUniswapV2Router02 swaper = isUni ? uniswaper : sushiSwaper;
// Approves the transfer for the swap. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix.
IERC20(path[0]).safeApprove(address(swaper), 0);
IERC20(path[0]).safeApprove(address(swaper), amountIn);
uint256[] memory awards;
if (isExactIn) {
awards = swaper.swapExactTokensForTokens(
amountIn,
amountOut,
path,
address(this),
block.timestamp
);
} else {
awards = swaper.swapTokensForExactTokens(
amountOut,
amountIn,
path,
address(this),
block.timestamp
);
}
reDeposit(path[path.length - 1], awards[awards.length - 1], msg.sender);
if (amountIn > awards[0]) {
reDeposit(path[0], amountIn.sub(awards[0]), msg.sender);
}
ValidationLogic.validateSwap(
msg.sender,
_reserves,
_usersConfig[msg.sender],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
ISwapMining(_addressesProvider.getSwapMiner()).swapMint(
msg.sender,
path[0],
path[path.length - 1],
awards[awards.length - 1]
);
emit Swap(
msg.sender,
path[0],
path[path.length - 1],
awards[0],
awards[awards.length - 1]
);
}
function swapWithAggregation(
address _reserve,
uint256 amount,
address _reserveTo,
bytes memory codes,
uint256 gas,
uint8 swapType
) external {
_beforeSwap(_reserve, amount);
IERC20(_reserve).safeApprove(inchor, 0);
IERC20(_reserve).safeApprove(inchor, amount);
(bool success, bytes memory result) = inchor.call{gas: gas}(codes);
require(success, "swap failed");
uint256 award;
if (swapType == 1) {
award = abi.decode(result, (uint256));
}
if (swapType == 2) {
(award, ) = abi.decode(result, (uint256, uint256));
}
if (swapType == 3) {
(award, , ) = abi.decode(result, (uint256, uint256, uint256));
}
reDeposit(_reserveTo, award, msg.sender);
ValidationLogic.validateSwap(
msg.sender,
_reserves,
_usersConfig[msg.sender],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
ISwapMining(_addressesProvider.getSwapMiner()).swapMint(
msg.sender,
_reserve,
_reserveTo,
award
);
emit Swap(msg.sender, _reserve, _reserveTo, amount, award);
}
function closeWithAggregation(
address _reserve,
uint256 amountIn,
address _reserveTo,
bytes memory codes,
uint256 gas,
uint8 swapType
) external {
_beforeClose(_reserve, amountIn);
IERC20(_reserve).safeApprove(inchor, 0);
IERC20(_reserve).safeApprove(inchor, amountIn);
(bool success, bytes memory result) = inchor.call{gas: gas}(codes);
require(success, "swap failed");
uint256 award;
if (swapType == 1) {
award = abi.decode(result, (uint256));
}
if (swapType == 2) {
(award, ) = abi.decode(result, (uint256, uint256));
}
if (swapType == 3) {
(award, , ) = abi.decode(result, (uint256, uint256, uint256));
}
reDeposit(_reserveTo, award, msg.sender);
ValidationLogic.validateSwap(
msg.sender,
_reserves,
_usersConfig[msg.sender],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
ISwapMining(_addressesProvider.getSwapMiner()).swapMint(
msg.sender,
_reserve,
_reserveTo,
award
);
emit Swap(msg.sender, _reserve, _reserveTo, amountIn, award);
}
function _beforeClose(address _reserve, uint256 amountIn) private {
DataTypes.ReserveData storage reserve = _reserves[_reserve];
ValidationLogic.validateDeposit(reserve, amountIn);
reserve.updateState();
uint256 userBalance =
IXToken(reserve.xTokenAddress).balanceOf(msg.sender);
reserve.updateInterestRates(
_reserve,
reserve.xTokenAddress,
0,
amountIn
);
IXToken(reserve.xTokenAddress).burn(
msg.sender,
address(this),
amountIn,
reserve.liquidityIndex
);
if (amountIn == userBalance) {
_usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
emit ReserveUsedAsCollateralDisabled(_reserve, msg.sender);
}
}
function _beforeSwap(address _reserve, uint256 amountIn) private {
DataTypes.ReserveData storage reserve = _reserves[_reserve];
ValidationLogic.validateDeposit(reserve, amountIn);
DataTypes.UserConfigurationMap storage userConfig =
_usersConfig[msg.sender];
reserve.updateState();
bool isFirstBorrowing = false;
isFirstBorrowing = IVariableDebtToken(reserve.variableDebtTokenAddress)
.mint(
msg.sender,
msg.sender,
amountIn,
reserve.variableBorrowIndex
);
emit Borrow(
_reserve,
msg.sender,
msg.sender,
amountIn,
reserve.currentVariableBorrowRate
);
if (isFirstBorrowing) {
userConfig.setBorrowing(reserve.id, true);
}
reserve.updateInterestRates(
_reserve,
reserve.xTokenAddress,
0,
amountIn
);
IXToken(reserve.xTokenAddress).transferUnderlyingTo(
address(this),
amountIn
);
}
/**
* @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned
* - E.g. User repays 100 USDC, burning 100 variable debt tokens of the `onBehalfOf` address
* @param asset The address of the borrowed underlying asset previously borrowed
* @param amount The amount to repay
* - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
* @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
* user calling the function if he wants to reduce/remove his own debt, or the address of any other
* other borrower whose debt should be removed
* @return The final amount repaid
**/
function repay(
address asset,
uint256 amount,
address onBehalfOf
) external override whenNotPaused returns (uint256) {
DataTypes.ReserveData storage reserve = _reserves[asset];
uint256 variableDebt = Helpers.getUserCurrentDebt(onBehalfOf, reserve);
address xToken = reserve.xTokenAddress;
uint256 userBalance = IERC20(xToken).balanceOf(msg.sender);
ValidationLogic.validateRepay(
reserve,
amount,
onBehalfOf,
variableDebt,
userBalance
);
uint256 paybackAmount = variableDebt;
if (amount < paybackAmount) {
paybackAmount = amount;
}
reserve.updateState();
IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
onBehalfOf,
paybackAmount,
reserve.variableBorrowIndex
);
reserve.updateInterestRates(asset, xToken, 0, 0);
if (variableDebt.sub(paybackAmount) == 0) {
_usersConfig[onBehalfOf].setBorrowing(reserve.id, false);
}
if (paybackAmount == userBalance) {
_usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
}
IXToken(xToken).burn(
msg.sender,
xToken,
paybackAmount,
reserve.liquidityIndex
);
emit Repay(asset, onBehalfOf, msg.sender, paybackAmount);
return paybackAmount;
}
/**
* @dev Allows depositors to enable/disable a specific deposited asset as collateral
* @param asset The address of the underlying asset deposited
* @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise
**/
function setUserUseReserveAsCollateral(address asset, bool useAsCollateral)
external
override
whenNotPaused
{
DataTypes.ReserveData storage reserve = _reserves[asset];
ValidationLogic.validateSetUseReserveAsCollateral(
reserve,
asset,
useAsCollateral,
_reserves,
_usersConfig[msg.sender],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
_usersConfig[msg.sender].setUsingAsCollateral(
reserve.id,
useAsCollateral
);
if (useAsCollateral) {
emit ReserveUsedAsCollateralEnabled(asset, msg.sender);
} else {
emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
}
}
struct LiquidationCallLocalVars {
uint256 variableDebt;
uint256 userBalance;
uint256 healthFactor;
uint256 maxCollateralToLiquidate;
uint256 collateralToSell;
uint256 liquidatorPreviousXTokenBalance;
}
/**
* @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1
* - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives
* a proportionally amount of the `collateralAsset` plus a bonus to cover market risk
* @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
* @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
* @param user The address of the borrower getting liquidated
* @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
**/
function liquidationCall(
address collateralAsset,
address debtAsset,
address user,
uint256 debtToCover
) external override whenNotPaused {
LiquidationCallLocalVars memory vars;
DataTypes.ReserveData storage collateralReserve =
_reserves[collateralAsset];
DataTypes.ReserveData storage debtReserve = _reserves[debtAsset];
DataTypes.UserConfigurationMap storage userConfig = _usersConfig[user];
vars.variableDebt = Helpers.getUserCurrentDebt(user, debtReserve).div(
2
);
(, , , , vars.healthFactor) = GenericLogic.calculateUserAccountData(
user,
_reserves,
_usersConfig[user],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
ValidationLogic.validateLiquidation(
collateralReserve,
debtReserve,
userConfig,
vars.healthFactor,
vars.variableDebt
);
vars.variableDebt = vars.variableDebt > debtToCover
? debtToCover
: vars.variableDebt;
vars.userBalance = IERC20(collateralReserve.xTokenAddress).balanceOf(
user
);
(vars.maxCollateralToLiquidate, vars.collateralToSell) = GenericLogic
.calculateAvailableCollateralToLiquidate(
collateralReserve,
debtReserve,
collateralAsset,
debtAsset,
vars.variableDebt,
vars.userBalance,
_addressesProvider.getPriceOracle()
);
collateralReserve.updateState();
vars.liquidatorPreviousXTokenBalance = IERC20(
collateralReserve
.xTokenAddress
)
.balanceOf(msg.sender);
IXToken(collateralReserve.xTokenAddress).transferOnLiquidation(
user,
msg.sender,
(vars.maxCollateralToLiquidate.sub(vars.collateralToSell))
);
if (vars.liquidatorPreviousXTokenBalance == 0) {
DataTypes.UserConfigurationMap storage liquidatorConfig =
_usersConfig[msg.sender];
liquidatorConfig.setUsingAsCollateral(collateralReserve.id, true);
emit ReserveUsedAsCollateralEnabled(collateralAsset, msg.sender);
}
if (vars.maxCollateralToLiquidate == vars.userBalance) {
userConfig.setUsingAsCollateral(collateralReserve.id, false);
emit ReserveUsedAsCollateralDisabled(collateralAsset, user);
}
if(collateralAsset == debtAsset) {
IVariableDebtToken(collateralReserve.variableDebtTokenAddress).burn(
user,
vars.collateralToSell,
collateralReserve.variableBorrowIndex
);
collateralReserve.updateInterestRates(collateralAsset, collateralReserve.xTokenAddress, 0, 0);
IXToken(collateralReserve.xTokenAddress).burn(
user,
collateralReserve.xTokenAddress,
vars.collateralToSell,
collateralReserve.liquidityIndex
);
emit LiquidationCall(
collateralAsset,
debtAsset,
user,
vars.collateralToSell,
vars.collateralToSell,
msg.sender
);
return;
}
collateralReserve.updateInterestRates(
collateralAsset,
collateralReserve.xTokenAddress,
0,
vars.collateralToSell
);
IXToken(collateralReserve.xTokenAddress).burn(
user,
address(this),
vars.collateralToSell,
collateralReserve.liquidityIndex
);
IERC20(collateralAsset).safeApprove(address(uniswaper), 0);
IERC20(collateralAsset).safeApprove(
address(uniswaper),
vars.collateralToSell
);
address[] memory path;
if (collateralAsset != wethAddress && debtAsset != wethAddress) {
path = new address[](3);
path[0] = collateralAsset;
path[1] = wethAddress;
path[2] = debtAsset;
} else {
path = new address[](2);
path[0] = collateralAsset;
path[1] = debtAsset;
}
uint256[] memory awards =
uniswaper.swapExactTokensForTokens(
vars.collateralToSell,
vars.variableDebt.mul(97).div(100),
path,
address(this),
block.timestamp
);
reDeposit(debtAsset, awards[awards.length - 1], user);
emit LiquidationCall(
collateralAsset,
debtAsset,
user,
awards[awards.length - 1],
vars.collateralToSell,
msg.sender
);
}
/**
* @dev Returns the state and configuration of the reserve
* @param asset The address of the underlying asset of the reserve
* @return The state of the reserve
**/
function getReserveData(address asset)
external
view
override
returns (DataTypes.ReserveData memory)
{
return _reserves[asset];
}
/**
* @dev Returns the user account data across all the reserves
* @param user The address of the user
* @return totalCollateralETH the total collateral in ETH of the user
* @return totalDebtETH the total debt in ETH of the user
* @return availableBorrowsETH the borrowing power left of the user
* @return currentLiquidationThreshold the liquidation threshold of the user
* @return ltv the loan to value of the user
* @return healthFactor the current health factor of the user
**/
function getUserAccountData(address user)
external
view
override
returns (
uint256 totalCollateralETH,
uint256 totalDebtETH,
uint256 availableBorrowsETH,
uint256 currentLiquidationThreshold,
uint256 ltv,
uint256 healthFactor
)
{
(
totalCollateralETH,
totalDebtETH,
ltv,
currentLiquidationThreshold,
healthFactor
) = GenericLogic.calculateUserAccountData(
user,
_reserves,
_usersConfig[user],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
availableBorrowsETH = GenericLogic.calculateAvailableBorrowsETH(
totalCollateralETH,
totalDebtETH,
ltv
);
}
/**
* @dev Returns the configuration of the reserve
* @param asset The address of the underlying asset of the reserve
* @return The configuration of the reserve
**/
function getConfiguration(address asset)
external
view
override
returns (DataTypes.ReserveConfigurationMap memory)
{
return _reserves[asset].configuration;
}
/**
* @dev Returns the configuration of the user across all the reserves
* @param user The user address
* @return The configuration of the user
**/
function getUserConfiguration(address user)
external
view
override
returns (DataTypes.UserConfigurationMap memory)
{
return _usersConfig[user];
}
/**
* @dev Returns the normalized income per unit of asset
* @param asset The address of the underlying asset of the reserve
* @return The reserve's normalized income
*/
function getReserveNormalizedIncome(address asset)
external
view
virtual
override
returns (uint256)
{
return _reserves[asset].getNormalizedIncome();
}
/**
* @dev Returns the normalized variable debt per unit of asset
* @param asset The address of the underlying asset of the reserve
* @return The reserve normalized variable debt
*/
function getReserveNormalizedVariableDebt(address asset)
external
view
override
returns (uint256)
{
return _reserves[asset].getNormalizedDebt();
}
/**
* @dev Returns if the MarginPool is paused
*/
function paused() external view override returns (bool) {
return _paused;
}
/**
* @dev Returns the list of the initialized reserves
**/
function getReservesList()
external
view
override
returns (address[] memory)
{
address[] memory _activeReserves = new address[](_reservesCount);
for (uint256 i = 0; i < _reservesCount; i++) {
_activeReserves[i] = _reservesList[i];
}
return _activeReserves;
}
/**
* @dev Returns the cached MarginPoolAddressesProvider connected to this contract
**/
function getAddressesProvider()
external
view
override
returns (IMarginPoolAddressesProvider)
{
return _addressesProvider;
}
/**
* @dev Validates and finalizes an xToken transfer
* - Only callable by the overlying xToken of the `asset`
* @param asset The address of the underlying asset of the xToken
* @param from The user from which the xTokens are transferred
* @param to The user receiving the xTokens
* @param amount The amount being transferred/withdrawn
* @param balanceFromBefore The xToken balance of the `from` user before the transfer
* @param balanceToBefore The xToken balance of the `to` user before the transfer
*/
function finalizeTransfer(
address asset,
address from,
address to,
uint256 amount,
uint256 balanceFromBefore,
uint256 balanceToBefore
) external override whenNotPaused {
require(
msg.sender == _reserves[asset].xTokenAddress,
Errors.MP_CALLER_MUST_BE_AN_XTOKEN
);
ValidationLogic.validateTransfer(
from,
_reserves,
_usersConfig[from],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
uint256 reserveId = _reserves[asset].id;
if (from != to) {
if (balanceFromBefore.sub(amount) == 0) {
DataTypes.UserConfigurationMap storage fromConfig =
_usersConfig[from];
fromConfig.setUsingAsCollateral(reserveId, false);
emit ReserveUsedAsCollateralDisabled(asset, from);
}
if (balanceToBefore == 0 && amount != 0) {
DataTypes.UserConfigurationMap storage toConfig =
_usersConfig[to];
toConfig.setUsingAsCollateral(reserveId, true);
emit ReserveUsedAsCollateralEnabled(asset, to);
}
}
}
/**
* @dev Initializes a reserve, activating it, assigning an xToken and debt tokens and an
* interest rate strategy
* - Only callable by the MarginPoolConfigurator contract
* @param asset The address of the underlying asset of the reserve
* @param xTokenAddress The address of the xToken that will be assigned to the reserve
* @param xTokenAddress The address of the VariableDebtToken that will be assigned to the reserve
* @param interestRateStrategyAddress The address of the interest rate strategy contract
**/
function initReserve(
address asset,
address xTokenAddress,
address variableDebtAddress,
address interestRateStrategyAddress
) external override onlyMarginPoolConfigurator {
require(Address.isContract(asset), Errors.MP_NOT_CONTRACT);
_reserves[asset].init(
xTokenAddress,
variableDebtAddress,
interestRateStrategyAddress
);
_addReserveToList(asset);
}
/**
* @dev Updates the address of the interest rate strategy contract
* - Only callable by the MarginPoolConfigurator contract
* @param asset The address of the underlying asset of the reserve
* @param rateStrategyAddress The address of the interest rate strategy contract
**/
function setReserveInterestRateStrategyAddress(
address asset,
address rateStrategyAddress
) external override onlyMarginPoolConfigurator {
_reserves[asset].interestRateStrategyAddress = rateStrategyAddress;
}
/**
* @dev Sets the configuration bitmap of the reserve as a whole
* - Only callable by the MarginPoolConfigurator contract
* @param asset The address of the underlying asset of the reserve
* @param configuration The new configuration bitmap
**/
function setConfiguration(address asset, uint256 configuration)
external
override
onlyMarginPoolConfigurator
{
_reserves[asset].configuration.data = configuration;
}
/**
* @dev Set the _pause state of a reserve
* - Only callable by the MarginPoolConfigurator contract
* @param val `true` to pause the reserve, `false` to un-pause it
*/
function setPause(bool val) external override onlyMarginPoolConfigurator {
_paused = val;
if (_paused) {
emit Paused();
} else {
emit Unpaused();
}
}
struct ExecuteBorrowParams {
address asset;
address user;
address onBehalfOf;
uint256 amount;
address xTokenAddress;
bool releaseUnderlying;
}
function _executeBorrow(ExecuteBorrowParams memory vars) internal {
DataTypes.ReserveData storage reserve = _reserves[vars.asset];
DataTypes.UserConfigurationMap storage userConfig =
_usersConfig[vars.onBehalfOf];
address oracle = _addressesProvider.getPriceOracle();
uint256 amountInETH =
IPriceOracleGetter(oracle)
.getAssetPrice(vars.asset)
.mul(vars.amount)
.div(10**reserve.configuration.getDecimals());
ValidationLogic.validateBorrow(
reserve,
vars.onBehalfOf,
vars.amount,
amountInETH,
_reserves,
userConfig,
_reservesList,
_reservesCount,
oracle
);
reserve.updateState();
bool isFirstBorrowing = false;
isFirstBorrowing = IVariableDebtToken(reserve.variableDebtTokenAddress)
.mint(
vars.user,
vars.onBehalfOf,
vars.amount,
reserve.variableBorrowIndex
);
if (isFirstBorrowing) {
userConfig.setBorrowing(reserve.id, true);
}
reserve.updateInterestRates(
vars.asset,
vars.xTokenAddress,
0,
vars.releaseUnderlying ? vars.amount : 0
);
if (vars.releaseUnderlying) {
IXToken(vars.xTokenAddress).transferUnderlyingTo(
vars.user,
vars.amount
);
}
emit Borrow(
vars.asset,
vars.user,
vars.onBehalfOf,
vars.amount,
reserve.currentVariableBorrowRate
);
}
function _addReserveToList(address asset) internal {
uint256 reservesCount = _reservesCount;
require(
reservesCount < MAX_NUMBER_RESERVES,
Errors.MP_NO_MORE_RESERVES_ALLOWED
);
bool reserveAlreadyAdded =
_reserves[asset].id != 0 || _reservesList[0] == asset;
if (!reserveAlreadyAdded) {
_reserves[asset].id = uint8(reservesCount);
_reservesList[reservesCount] = asset;
_reservesCount = reservesCount + 1;
}
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {Ownable} from './Ownable.sol';
import './Address.sol';
// Prettier ignore to prevent buidler flatter bug
// prettier-ignore
import {InitializableImmutableAdminUpgradeabilityProxy} from './InitializableImmutableAdminUpgradeabilityProxy.sol';
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
// import './BaseUpgradeabilityProxy.sol';
/**
* @title MarginPoolAddressesProvider contract
* @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
* - Acting also as factory of proxies and admin of those, so with right to change its implementations
* - Owned by the Lever Governance
* @author Lever
**/
contract MarginPoolAddressesProvider is Ownable, IMarginPoolAddressesProvider {
mapping(bytes32 => address) private _addresses;
bytes32 private constant MARGIN_POOL = 'MARGIN_POOL';
bytes32 private constant MARGIN_POOL_CONFIGURATOR = 'MARGIN_POOL_CONFIGURATOR';
bytes32 private constant POOL_ADMIN = 'POOL_ADMIN';
bytes32 private constant EMERGENCY_ADMIN = 'EMERGENCY_ADMIN';
bytes32 private constant PRICE_ORACLE = 'PRICE_ORACLE';
bytes32 private constant LENDING_RATE_ORACLE = 'LENDING_RATE_ORACLE';
bytes32 private constant LEVER_TOKEN = 'LEVER_TOKEN';
bytes32 private constant TREASURY_ADDRESS = 'TREASURY_ADDRESS';
bytes32 private constant REWARDS_DISTRIBUTION = 'REWARDS_DISTRIBUTION';
bytes32 private constant SWAP_MINER = 'SWAP_MINER';
bytes32 private constant ORDER_BOOK = 'ORDER_BOOK';
constructor() public {
}
/**
* @dev General function to update the implementation of a proxy registered with
* certain `id`. If there is no proxy registered, it will instantiate one and
* set as implementation the `implementationAddress`
* IMPORTANT Use this function carefully, only for ids that don't have an explicit
* setter function, in order to avoid unexpected consequences
* @param id The id
* @param implementationAddress The address of the new implementation
*/
function setAddressAsProxy(bytes32 id, address implementationAddress)
external
override
onlyOwner
{
_updateImpl(id, implementationAddress);
emit AddressSet(id, implementationAddress, true);
}
/**
* @dev Sets an address for an id replacing the address saved in the addresses map
* IMPORTANT Use this function carefully, as it will do a hard replacement
* @param id The id
* @param newAddress The address to set
*/
function setAddress(bytes32 id, address newAddress) external override onlyOwner {
_addresses[id] = newAddress;
emit AddressSet(id, newAddress, false);
}
/**
* @dev Returns an address by id
* @return The address
*/
function getAddress(bytes32 id) public view override returns (address) {
return _addresses[id];
}
/**
* @dev Returns the address of the MarginPool proxy
* @return The MarginPool proxy address
**/
function getMarginPool() external view override returns (address) {
return getAddress(MARGIN_POOL);
}
/**
* @dev Updates the implementation of the MarginPool, or creates the proxy
* setting the new `pool` implementation on the first time calling it
* @param pool The new MarginPool implementation
**/
function setMarginPoolImpl(address pool,address UniswapRouter, address SushiswapRouter,address _weth) external override onlyOwner {
_updatePoolImpl(MARGIN_POOL, pool, UniswapRouter,SushiswapRouter, _weth);
emit MarginPoolUpdated(pool);
}
/**
* @dev Returns the address of the MarginPoolConfigurator proxy
* @return The MarginPoolConfigurator proxy address
**/
function getMarginPoolConfigurator() external view override returns (address) {
return getAddress(MARGIN_POOL_CONFIGURATOR);
}
/**
* @dev Updates the implementation of the MarginPoolConfigurator, or creates the proxy
* setting the new `configurator` implementation on the first time calling it
* @param configurator The new MarginPoolConfigurator implementation
**/
function setMarginPoolConfiguratorImpl(address configurator) external override onlyOwner {
_updateImpl(MARGIN_POOL_CONFIGURATOR, configurator);
emit MarginPoolConfiguratorUpdated(configurator);
}
/**
* @dev The functions below are getters/setters of addresses that are outside the context
* of the protocol hence the upgradable proxy pattern is not used
**/
function getPoolAdmin() external view override returns (address) {
return getAddress(POOL_ADMIN);
}
function setPoolAdmin(address admin) external override onlyOwner {
_addresses[POOL_ADMIN] = admin;
emit ConfigurationAdminUpdated(admin);
}
function getEmergencyAdmin() external view override returns (address) {
return getAddress(EMERGENCY_ADMIN);
}
function setEmergencyAdmin(address emergencyAdmin) external override onlyOwner {
_addresses[EMERGENCY_ADMIN] = emergencyAdmin;
emit EmergencyAdminUpdated(emergencyAdmin);
}
function getPriceOracle() external view override returns (address) {
return getAddress(PRICE_ORACLE);
}
function setPriceOracle(address priceOracle) external override onlyOwner {
_addresses[PRICE_ORACLE] = priceOracle;
emit PriceOracleUpdated(priceOracle);
}
function getLeverToken() external view override returns (address) {
return getAddress(LEVER_TOKEN);
}
function setLeverToken(address lever) external override onlyOwner {
_addresses[LEVER_TOKEN] = lever;
emit LeverTokenUpdated(lever);
}
function getTreasuryAddress() external view override returns (address) {
return getAddress(TREASURY_ADDRESS);
}
function setTreasuryAddress(address treasuryAddress) external override onlyOwner {
_addresses[TREASURY_ADDRESS] = treasuryAddress;
emit TreasuryAddressUpdated(treasuryAddress);
}
function getRewardsDistribution() external view override returns (address) {
return getAddress(REWARDS_DISTRIBUTION);
}
function setRewardsDistribution(address rewardsDistribution) external override onlyOwner {
_addresses[REWARDS_DISTRIBUTION] = rewardsDistribution;
emit RewardsDistributionUpdated(rewardsDistribution);
}
/**
* @dev Returns the address of the OrderBook proxy
* @return The OrderBook proxy address
**/
function getOrderBook() external view override returns (address) {
return getAddress(ORDER_BOOK);
}
/**
* @dev Updates the implementation of the OrderBook, or creates the proxy
* setting the new `pool` implementation on the first time calling it
* @param orderBook The new OrderBook implementation
**/
function setOrderBookImpl(address orderBook, address UniswapRouter, address _weth) external override onlyOwner {
_updateImpl(ORDER_BOOK, orderBook, UniswapRouter, _weth);
emit OrderBookUpdated(orderBook);
}
/**
* @dev Returns the address of the SwapMiner proxy
* @return The SwapMiner proxy address
**/
function getSwapMiner() external view override returns (address) {
return getAddress(SWAP_MINER);
}
/**
* @dev Updates the implementation of the SwapMiner, or creates the proxy
* setting the new `pool` implementation on the first time calling it
* @param swapMiner The new SwapMiner implementation
**/
function setSwapMinerImpl(address swapMiner, address UniswapRouter, address _uniswapLevPairToken, address LeverUsdOracle) external override onlyOwner {
_updateSwapMinerImpl(SWAP_MINER, swapMiner, UniswapRouter, _uniswapLevPairToken, LeverUsdOracle);
emit SwapMinerUpdated(swapMiner);
}
/**
* @dev Internal function to update the implementation of a specific proxied component of the protocol
* - If there is no proxy registered in the given `id`, it creates the proxy setting `newAdress`
* as implementation and calls the initialize() function on the proxy
* - If there is already a proxy registered, it just updates the implementation to `newAddress` and
* calls the initialize() function via upgradeToAndCall() in the proxy
* @param id The id of the proxy to be updated
* @param newAddress The address of the new implementation
**/
function _updateImpl(bytes32 id, address newAddress) internal {
address payable proxyAddress = payable(_addresses[id]);
InitializableImmutableAdminUpgradeabilityProxy proxy =
InitializableImmutableAdminUpgradeabilityProxy(proxyAddress);
bytes memory params = abi.encodeWithSignature('initialize(address)', address(this));
if (proxyAddress == address(0)) {
proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this));
proxy.initialize(newAddress, params);
_addresses[id] = address(proxy);
emit ProxyCreated(id, address(proxy));
} else {
proxy.upgradeToAndCall(newAddress, params);
}
}
/**
* @dev Internal function to update the implementation of a specific proxied component of the protocol
* - If there is no proxy registered in the given `id`, it creates the proxy setting `newAdress`
* as implementation and calls the initialize() function on the proxy
* - If there is already a proxy registered, it just updates the implementation to `newAddress` and
* calls the initialize() function via upgradeToAndCall() in the proxy
* @param id The id of the proxy to be updated
* @param newAddress The address of the new implementation
**/
function _updateImpl(bytes32 id, address newAddress, address UniswapRouter,address _weth) internal {
address payable proxyAddress = payable(_addresses[id]);
InitializableImmutableAdminUpgradeabilityProxy proxy =
InitializableImmutableAdminUpgradeabilityProxy(proxyAddress);
bytes memory params = abi.encodeWithSignature('initialize(address,address,address)', address(this), UniswapRouter,_weth);
if (proxyAddress == address(0)) {
proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this));
proxy.initialize(newAddress, params);
_addresses[id] = address(proxy);
emit ProxyCreated(id, address(proxy));
} else {
proxy.upgradeToAndCall(newAddress, params);
}
}
/**
* @dev Internal function to update the implementation of a specific proxied component of the protocol
* - If there is no proxy registered in the given `id`, it creates the proxy setting `newAdress`
* as implementation and calls the initialize() function on the proxy
* - If there is already a proxy registered, it just updates the implementation to `newAddress` and
* calls the initialize() function via upgradeToAndCall() in the proxy
* @param id The id of the proxy to be updated
* @param newAddress The address of the new implementation
**/
function _updatePoolImpl(bytes32 id, address newAddress, address UniswapRouter, address SushiswapRouter,address _weth) internal {
address payable proxyAddress = payable(_addresses[id]);
InitializableImmutableAdminUpgradeabilityProxy proxy =
InitializableImmutableAdminUpgradeabilityProxy(proxyAddress);
bytes memory params = abi.encodeWithSignature('initialize(address,address,address,address)', address(this), UniswapRouter,SushiswapRouter, _weth);
if (proxyAddress == address(0)) {
proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this));
proxy.initialize(newAddress, params);
_addresses[id] = address(proxy);
emit ProxyCreated(id, address(proxy));
} else {
proxy.upgradeToAndCall(newAddress, params);
}
}
function _updateSwapMinerImpl(bytes32 id, address newAddress, address UniswapRouter,address _uniswapLevPairToken,address LeverUsdOracle) internal {
address payable proxyAddress = payable(_addresses[id]);
InitializableImmutableAdminUpgradeabilityProxy proxy =
InitializableImmutableAdminUpgradeabilityProxy(proxyAddress);
bytes memory params = abi.encodeWithSignature('initialize(address,address,address,address)', address(this), UniswapRouter,_uniswapLevPairToken,LeverUsdOracle);
if (proxyAddress == address(0)) {
proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this));
proxy.initialize(newAddress, params);
_addresses[id] = address(proxy);
emit ProxyCreated(id, address(proxy));
} else {
proxy.upgradeToAndCall(newAddress, params);
}
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import {SafeMath} from './SafeMath.sol';
import {VersionedInitializable} from './VersionedInitializable.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
import {IMarginPool} from './IMarginPool.sol';
import {ITokenConfiguration} from './ITokenConfiguration.sol';
import {IERC20Detailed} from './IERC20Detailed.sol';
import {Errors} from './Errors.sol';
import {PercentageMath} from './PercentageMath.sol';
import {DataTypes} from './DataTypes.sol';
/**
* @title MarginPoolConfigurator contract
* @author Lever
* @dev Implements the configuration methods for the Lever protocol
**/
contract MarginPoolConfigurator is VersionedInitializable {
using SafeMath for uint256;
using PercentageMath for uint256;
using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
/**
* @dev Emitted when a reserve is initialized.
* @param asset The address of the underlying asset of the reserve
* @param xToken The address of the associated xToken contract
* @param variableDebtToken The address of the associated variable rate debt token
* @param interestRateStrategyAddress The address of the interest rate strategy for the reserve
**/
event ReserveInitialized(
address indexed asset,
address indexed xToken,
address variableDebtToken,
address interestRateStrategyAddress
);
/**
* @dev Emitted when borrowing is enabled on a reserve
* @param asset The address of the underlying asset of the reserve
* @param rateEnabled false otherwise
**/
/**
* @dev Emitted when borrowing is disabled on a reserve
* @param asset The address of the underlying asset of the reserve
**/
event BorrowingDisabledOnReserve(address indexed asset);
/**
* @dev Emitted when the collateralization risk parameters for the specified asset are updated.
* @param asset The address of the underlying asset 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
**/
event CollateralConfigurationChanged(
address indexed asset,
uint256 ltv,
uint256 liquidationThreshold,
uint256 liquidationBonus
);
/**
* @dev Emitted when a reserve is activated
* @param asset The address of the underlying asset of the reserve
**/
event ReserveActivated(address indexed asset);
/**
* @dev Emitted when a reserve is deactivated
* @param asset The address of the underlying asset of the reserve
**/
event ReserveDeactivated(address indexed asset);
/**
* @dev Emitted when a reserve is frozen
* @param asset The address of the underlying asset of the reserve
**/
event ReserveFrozen(address indexed asset);
/**
* @dev Emitted when a reserve is unfrozen
* @param asset The address of the underlying asset of the reserve
**/
event ReserveUnfrozen(address indexed asset);
/**
* @dev Emitted when a reserve factor is updated
* @param asset The address of the underlying asset of the reserve
* @param factor The new reserve factor
**/
event ReserveFactorChanged(address indexed asset, uint256 factor);
/**
* @dev Emitted when the reserve decimals are updated
* @param asset The address of the underlying asset of the reserve
* @param decimals The new decimals
**/
event ReserveDecimalsChanged(address indexed asset, uint256 decimals);
/**
* @dev Emitted when a reserve interest strategy contract is updated
* @param asset The address of the underlying asset of the reserve
* @param strategy The new address of the interest strategy contract
**/
event ReserveInterestRateStrategyChanged(address indexed asset, address strategy);
/**
* @dev Emitted when an xToken implementation is upgraded
* @param asset The address of the underlying asset of the reserve
* @param proxy The xToken proxy address
* @param implementation The new xToken implementation
**/
event XTokenUpgraded(
address indexed asset,
address indexed proxy,
address indexed implementation
);
/**
* @dev Emitted when the implementation of a variable debt token is upgraded
* @param asset The address of the underlying asset of the reserve
* @param proxy The variable debt token proxy address
* @param implementation The new xToken implementation
**/
event VariableDebtTokenUpgraded(
address indexed asset,
address indexed proxy,
address indexed implementation
);
IMarginPoolAddressesProvider public addressesProvider;
IMarginPool public pool;
modifier onlyPoolAdmin {
require(addressesProvider.getPoolAdmin() == msg.sender, Errors.CALLER_NOT_POOL_ADMIN);
_;
}
modifier onlyEmergencyAdmin {
require(
addressesProvider.getEmergencyAdmin() == msg.sender,
Errors.MPC_CALLER_NOT_EMERGENCY_ADMIN
);
_;
}
uint256 internal constant CONFIGURATOR_REVISION = 0x1;
function getRevision() internal pure override returns (uint256) {
return CONFIGURATOR_REVISION;
}
function initialize(IMarginPoolAddressesProvider provider) public initializer {
addressesProvider = provider;
pool = IMarginPool(addressesProvider.getMarginPool());
}
/**
* @dev Initializes a reserve
* @param xTokenImpl The address of the xToken contract implementation
* @param variableDebtTokenImpl The address of the variable debt token contract
* @param underlyingAssetDecimals The decimals of the reserve underlying asset
* @param interestRateStrategyAddress The address of the interest rate strategy contract for this reserve
**/
function initReserve(
address xTokenImpl,
address variableDebtTokenImpl,
uint8 underlyingAssetDecimals,
address interestRateStrategyAddress
) public onlyPoolAdmin {
address asset = ITokenConfiguration(xTokenImpl).UNDERLYING_ASSET_ADDRESS();
require(
address(pool) == ITokenConfiguration(xTokenImpl).POOL(),
Errors.MPC_INVALID_XTOKEN_POOL_ADDRESS
);
require(
address(pool) == ITokenConfiguration(variableDebtTokenImpl).POOL(),
Errors.MPC_INVALID_VARIABLE_DEBT_TOKEN_POOL_ADDRESS
);
require(
asset == ITokenConfiguration(variableDebtTokenImpl).UNDERLYING_ASSET_ADDRESS(),
Errors.MPC_INVALID_VARIABLE_DEBT_TOKEN_UNDERLYING_ADDRESS
);
pool.initReserve(
asset,
xTokenImpl,
variableDebtTokenImpl,
interestRateStrategyAddress
);
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
currentConfig.setDecimals(underlyingAssetDecimals);
currentConfig.setActive(true);
currentConfig.setFrozen(false);
pool.setConfiguration(asset, currentConfig.data);
emit ReserveInitialized(
asset,
xTokenImpl,
variableDebtTokenImpl,
interestRateStrategyAddress
);
}
/**
* @dev Enables borrowing on a reserve
* @param asset The address of the underlying asset of the reserve
**/
function enableBorrowingOnReserve(address asset)
external
onlyPoolAdmin
{
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
currentConfig.setBorrowingEnabled(true);
pool.setConfiguration(asset, currentConfig.data);
}
/**
* @dev Disables borrowing on a reserve
* @param asset The address of the underlying asset of the reserve
**/
function disableBorrowingOnReserve(address asset) external onlyPoolAdmin {
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
currentConfig.setBorrowingEnabled(false);
pool.setConfiguration(asset, currentConfig.data);
emit BorrowingDisabledOnReserve(asset);
}
/**
* @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 underlying asset 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. The values is always above 100%. A value of 105%
* means the liquidator will receive a 5% bonus
**/
function configureReserveAsCollateral(
address asset,
uint256 ltv,
uint256 liquidationThreshold,
uint256 liquidationBonus
) external onlyPoolAdmin {
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
//validation of the parameters: the LTV can
//only be lower or equal than the liquidation threshold
//(otherwise a loan against the asset would cause instantaneous liquidation)
require(ltv <= liquidationThreshold, Errors.MPC_INVALID_CONFIGURATION);
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.MPC_INVALID_CONFIGURATION
);
//if threshold * bonus is less than PERCENTAGE_FACTOR, it's guaranteed that at the moment
//a loan is taken there is enough collateral available to cover the liquidation bonus
require(
liquidationThreshold.percentMul(liquidationBonus) <= PercentageMath.PERCENTAGE_FACTOR,
Errors.MPC_INVALID_CONFIGURATION
);
} else {
require(liquidationBonus == 0, Errors.MPC_INVALID_CONFIGURATION);
//if the liquidation threshold is being set to 0,
// the reserve is being disabled as collateral. To do so,
//we need to ensure no liquidity is deposited
_checkNoLiquidity(asset);
}
currentConfig.setLtv(ltv);
currentConfig.setLiquidationThreshold(liquidationThreshold);
currentConfig.setLiquidationBonus(liquidationBonus);
pool.setConfiguration(asset, currentConfig.data);
emit CollateralConfigurationChanged(asset, ltv, liquidationThreshold, liquidationBonus);
}
/**
* @dev Activates a reserve
* @param asset The address of the underlying asset of the reserve
**/
function activateReserve(address asset) external onlyPoolAdmin {
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
currentConfig.setActive(true);
pool.setConfiguration(asset, currentConfig.data);
emit ReserveActivated(asset);
}
/**
* @dev Deactivates a reserve
* @param asset The address of the underlying asset of the reserve
**/
function deactivateReserve(address asset) external onlyPoolAdmin {
_checkNoLiquidity(asset);
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
currentConfig.setActive(false);
pool.setConfiguration(asset, currentConfig.data);
emit ReserveDeactivated(asset);
}
/**
* @dev Freezes a reserve. A frozen reserve doesn't allow any new deposit, borrow or rate swap
* but allows repayments, liquidations, rate rebalances and withdrawals
* @param asset The address of the underlying asset of the reserve
**/
function freezeReserve(address asset) external onlyPoolAdmin {
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
currentConfig.setFrozen(true);
pool.setConfiguration(asset, currentConfig.data);
emit ReserveFrozen(asset);
}
/**
* @dev Unfreezes a reserve
* @param asset The address of the underlying asset of the reserve
**/
function unfreezeReserve(address asset) external onlyPoolAdmin {
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
currentConfig.setFrozen(false);
pool.setConfiguration(asset, currentConfig.data);
emit ReserveUnfrozen(asset);
}
/**
* @dev Updates the reserve factor of a reserve
* @param asset The address of the underlying asset of the reserve
* @param reserveFactor The new reserve factor of the reserve
**/
function setReserveFactor(address asset, uint256 reserveFactor) external onlyPoolAdmin {
DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);
currentConfig.setReserveFactor(reserveFactor);
pool.setConfiguration(asset, currentConfig.data);
emit ReserveFactorChanged(asset, reserveFactor);
}
/**
* @dev Sets the interest rate strategy of a reserve
* @param asset The address of the underlying asset of the reserve
* @param rateStrategyAddress The new address of the interest strategy contract
**/
function setReserveInterestRateStrategyAddress(address asset, address rateStrategyAddress)
external
onlyPoolAdmin
{
pool.setReserveInterestRateStrategyAddress(asset, rateStrategyAddress);
emit ReserveInterestRateStrategyChanged(asset, rateStrategyAddress);
}
/**
* @dev pauses or unpauses all the actions of the protocol, including xToken transfers
* @param val true if protocol needs to be paused, false otherwise
**/
function setPoolPause(bool val) external onlyEmergencyAdmin {
pool.setPause(val);
}
function _checkNoLiquidity(address asset) internal view {
DataTypes.ReserveData memory reserveData = pool.getReserveData(asset);
uint256 availableLiquidity = IERC20Detailed(asset).balanceOf(reserveData.xTokenAddress);
require(
availableLiquidity == 0 && reserveData.currentLiquidityRate == 0,
Errors.MPC_RESERVE_LIQUIDITY_NOT_0
);
}
}
pragma solidity 0.6.12;
// SPDX-License-Identifier: agpl-3.0
import {UserConfiguration} from './UserConfiguration.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {ReserveLogic} from './ReserveLogic.sol';
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
import {DataTypes} from './DataTypes.sol';
contract MarginPoolStorage {
using ReserveLogic for DataTypes.ReserveData;
using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
using UserConfiguration for DataTypes.UserConfigurationMap;
IMarginPoolAddressesProvider internal _addressesProvider;
mapping(address => DataTypes.ReserveData) internal _reserves;
mapping(address => DataTypes.UserConfigurationMap) internal _usersConfig;
// the list of the available reserves, structured as a mapping for gas savings reasons
mapping(uint256 => address) internal _reservesList;
uint256 internal _reservesCount;
bool internal _paused;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {SafeMath} from './SafeMath.sol';
import {WadRayMath} from './WadRayMath.sol';
library MathUtils {
using SafeMath for uint256;
using WadRayMath for uint256;
/// @dev Ignoring leap years
uint256 internal constant SECONDS_PER_YEAR = 365 days;
/**
* @dev Function to calculate the interest accumulated using a linear interest rate formula
* @param rate The interest rate, in ray
* @param lastUpdateTimestamp The timestamp of the last update of the interest
* @return The interest rate linearly accumulated during the timeDelta, in ray
**/
function calculateLinearInterest(uint256 rate, uint40 lastUpdateTimestamp)
internal
view
returns (uint256)
{
//solium-disable-next-line
uint256 timeDifference = block.timestamp.sub(uint256(lastUpdateTimestamp));
return (rate.mul(timeDifference) / SECONDS_PER_YEAR).add(WadRayMath.ray());
}
/**
* @dev Function to calculate the interest using a compounded interest rate formula
* To avoid expensive exponentiation, the calculation is performed using a binomial approximation:
*
* (1+x)^n = 1+n*x+[n/2*(n-1)]*x^2+[n/6*(n-1)*(n-2)*x^3...
*
* The approximation slightly underpays liquidity providers and undercharges borrowers, with the advantage of great gas cost reductions
* The whitepaper contains reference to the approximation and a table showing the margin of error per different time periods
*
* @param rate The interest rate, in ray
* @param lastUpdateTimestamp The timestamp of the last update of the interest
* @return The interest rate compounded during the timeDelta, in ray
**/
function calculateCompoundedInterest(
uint256 rate,
uint40 lastUpdateTimestamp,
uint256 currentTimestamp
) internal pure returns (uint256) {
//solium-disable-next-line
uint256 exp = currentTimestamp.sub(uint256(lastUpdateTimestamp));
if (exp == 0) {
return WadRayMath.ray();
}
uint256 expMinusOne = exp - 1;
uint256 expMinusTwo = exp > 2 ? exp - 2 : 0;
uint256 ratePerSecond = rate / SECONDS_PER_YEAR;
uint256 basePowerTwo = ratePerSecond.rayMul(ratePerSecond);
uint256 basePowerThree = basePowerTwo.rayMul(ratePerSecond);
uint256 secondTerm = exp.mul(expMinusOne).mul(basePowerTwo) / 2;
uint256 thirdTerm = exp.mul(expMinusOne).mul(expMinusTwo).mul(basePowerThree) / 6;
return WadRayMath.ray().add(ratePerSecond.mul(exp)).add(secondTerm).add(thirdTerm);
}
/**
* @dev Calculates the compounded interest between the timestamp of the last update and the current block timestamp
* @param rate The interest rate (in ray)
* @param lastUpdateTimestamp The timestamp from which the interest accumulation needs to be calculated
**/
function calculateCompoundedInterest(uint256 rate, uint40 lastUpdateTimestamp)
internal
view
returns (uint256)
{
return calculateCompoundedInterest(rate, lastUpdateTimestamp, block.timestamp);
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;
contract Migrations {
address public owner = msg.sender;
uint public last_completed_migration;
modifier restricted() {
require(
msg.sender == owner,
"This function is restricted to the contract's owner"
);
_;
}
function setCompleted(uint completed) public restricted {
last_completed_migration = completed;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import './Context.sol';
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), 'Ownable: caller is not the owner');
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), 'Ownable: new owner is the zero address');
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {Errors} from './Errors.sol';
/**
* @title PercentageMath library
* @author Lever
* @notice Provides functions to perform percentage calculations
* @dev Percentages are defined by default with 2 decimals of precision (100.00). The precision is indicated by PERCENTAGE_FACTOR
* @dev Operations are rounded half up
**/
library PercentageMath {
uint256 constant PERCENTAGE_FACTOR = 1e4; //percentage plus two decimals
uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2;
/**
* @dev Executes a percentage multiplication
* @param value The value of which the percentage needs to be calculated
* @param percentage The percentage of the value to be calculated
* @return The percentage of value
**/
function percentMul(uint256 value, uint256 percentage) internal pure returns (uint256) {
if (value == 0 || percentage == 0) {
return 0;
}
require(
value <= (type(uint256).max - HALF_PERCENT) / percentage,
Errors.MATH_MULTIPLICATION_OVERFLOW
);
return (value * percentage + HALF_PERCENT) / PERCENTAGE_FACTOR;
}
/**
* @dev Executes a percentage division
* @param value The value of which the percentage needs to be calculated
* @param percentage The percentage of the value to be calculated
* @return The value divided the percentage
**/
function percentDiv(uint256 value, uint256 percentage) internal pure returns (uint256) {
require(percentage != 0, Errors.MATH_DIVISION_BY_ZERO);
uint256 halfPercentage = percentage / 2;
require(
value <= (type(uint256).max - halfPercentage) / PERCENTAGE_FACTOR,
Errors.MATH_MULTIPLICATION_OVERFLOW
);
return (value * PERCENTAGE_FACTOR + halfPercentage) / percentage;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IPriceOracle} from './IPriceOracle.sol';
contract PriceOracle is IPriceOracle {
mapping(address => uint256) prices;
uint256 ethPriceUsd;
event AssetPriceUpdated(address _asset, uint256 _price, uint256 timestamp);
event EthPriceUpdated(uint256 _price, uint256 timestamp);
function getAssetPrice(address _asset) external view override returns (uint256) {
return prices[_asset];
}
function setAssetPrice(address _asset, uint256 _price) external override {
prices[_asset] = _price;
emit AssetPriceUpdated(_asset, _price, block.timestamp);
}
function getEthUsdPrice() external view returns (uint256) {
return ethPriceUsd;
}
function setEthUsdPrice(uint256 _price) external {
ethPriceUsd = _price;
emit EthPriceUpdated(_price, block.timestamp);
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.6.0;
/**
* @title Proxy
* @dev Implements delegation of calls to other contracts, with proper
* forwarding of return values and bubbling of failures.
* It defines a fallback function that delegates all calls to the address
* returned by the abstract _implementation() internal function.
*/
abstract contract Proxy {
/**
* @dev Fallback function.
* Implemented entirely in `_fallback`.
*/
fallback() external payable {
_fallback();
}
/**
* @return The Address of the implementation.
*/
function _implementation() internal view virtual returns (address);
/**
* @dev Delegates execution to an implementation contract.
* This is a low level function that doesn't return to its internal call site.
* It will return to the external caller whatever the implementation returns.
* @param implementation Address to delegate.
*/
function _delegate(address implementation) internal {
//solium-disable-next-line
assembly {
// Copy msg.data. We take full control of memory in this inline assembly
// block because it will not return to Solidity code. We overwrite the
// Solidity scratch pad at memory position 0.
calldatacopy(0, 0, calldatasize())
// Call the implementation.
// out and outsize are 0 because we don't know the size yet.
let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
// Copy the returned data.
returndatacopy(0, 0, returndatasize())
switch result
// delegatecall returns 0 on error.
case 0 {
revert(0, returndatasize())
}
default {
return(0, returndatasize())
}
}
}
/**
* @dev Function that is run as the first thing in the fallback function.
* Can be redefined in derived contracts to add functionality.
* Redefinitions must call super._willFallback().
*/
function _willFallback() internal virtual {}
/**
* @dev fallback implementation.
* Extracted to enable manual triggering.
*/
function _fallback() internal {
_willFallback();
_delegate(_implementation());
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {Errors} from './Errors.sol';
import {DataTypes} from './DataTypes.sol';
/**
* @title ReserveConfiguration library
* @author Lever
* @notice Implements the bitmap logic to handle the reserve configuration
*/
library ReserveConfiguration {
uint256 constant LTV_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
uint256 constant LIQUIDATION_BONUS_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
uint256 constant DECIMALS_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFF; // prettier-ignore
uint256 constant ACTIVE_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
uint256 constant FROZEN_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
uint256 constant BORROWING_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFFFFFFFFFFFFF; // prettier-ignore
uint256 constant RESERVE_FACTOR_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFF; // prettier-ignore
/// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
uint256 constant RESERVE_DECIMALS_START_BIT_POSITION = 48;
uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
uint256 constant BORROWING_ENABLED_START_BIT_POSITION = 58;
uint256 constant RESERVE_FACTOR_START_BIT_POSITION = 64;
uint256 constant MAX_VALID_LTV = 65535;
uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
uint256 constant MAX_VALID_DECIMALS = 255;
uint256 constant MAX_VALID_RESERVE_FACTOR = 65535;
/**
* @dev Sets the Loan to Value of the reserve
* @param self The reserve configuration
* @param ltv the new ltv
**/
function setLtv(DataTypes.ReserveConfigurationMap memory self, uint256 ltv) internal pure {
require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);
self.data = (self.data & LTV_MASK) | ltv;
}
/**
* @dev Gets the Loan to Value of the reserve
* @param self The reserve configuration
* @return The loan to value
**/
function getLtv(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
return self.data & ~LTV_MASK;
}
/**
* @dev Sets the liquidation threshold of the reserve
* @param self The reserve configuration
* @param threshold The new liquidation threshold
**/
function setLiquidationThreshold(DataTypes.ReserveConfigurationMap memory self, uint256 threshold)
internal
pure
{
require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD);
self.data =
(self.data & LIQUIDATION_THRESHOLD_MASK) |
(threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
}
/**
* @dev Gets the liquidation threshold of the reserve
* @param self The reserve configuration
* @return The liquidation threshold
**/
function getLiquidationThreshold(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION;
}
/**
* @dev Sets the liquidation bonus of the reserve
* @param self The reserve configuration
* @param bonus The new liquidation bonus
**/
function setLiquidationBonus(DataTypes.ReserveConfigurationMap memory self, uint256 bonus)
internal
pure
{
require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS);
self.data =
(self.data & LIQUIDATION_BONUS_MASK) |
(bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
}
/**
* @dev Gets the liquidation bonus of the reserve
* @param self The reserve configuration
* @return The liquidation bonus
**/
function getLiquidationBonus(DataTypes.ReserveConfigurationMap storage self)
internal
view
returns (uint256)
{
return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION;
}
/**
* @dev Sets the decimals of the underlying asset of the reserve
* @param self The reserve configuration
* @param decimals The decimals
**/
function setDecimals(DataTypes.ReserveConfigurationMap memory self, uint256 decimals)
internal
pure
{
require(decimals <= MAX_VALID_DECIMALS, Errors.RC_INVALID_DECIMALS);
self.data = (self.data & DECIMALS_MASK) | (decimals << RESERVE_DECIMALS_START_BIT_POSITION);
}
/**
* @dev Gets the decimals of the underlying asset of the reserve
* @param self The reserve configuration
* @return The decimals of the asset
**/
function getDecimals(DataTypes.ReserveConfigurationMap storage self)
internal
view
returns (uint256)
{
return (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION;
}
/**
* @dev Sets the active state of the reserve
* @param self The reserve configuration
* @param active The active state
**/
function setActive(DataTypes.ReserveConfigurationMap memory self, bool active) internal pure {
self.data =
(self.data & ACTIVE_MASK) |
(uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
}
/**
* @dev Gets the active state of the reserve
* @param self The reserve configuration
* @return The active state
**/
function getActive(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
return (self.data & ~ACTIVE_MASK) != 0;
}
/**
* @dev Sets the frozen state of the reserve
* @param self The reserve configuration
* @param frozen The frozen state
**/
function setFrozen(DataTypes.ReserveConfigurationMap memory self, bool frozen) internal pure {
self.data =
(self.data & FROZEN_MASK) |
(uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
}
/**
* @dev Gets the frozen state of the reserve
* @param self The reserve configuration
* @return The frozen state
**/
function getFrozen(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
return (self.data & ~FROZEN_MASK) != 0;
}
/**
* @dev Enables or disables borrowing on the reserve
* @param self The reserve configuration
* @param enabled True if the borrowing needs to be enabled, false otherwise
**/
function setBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled)
internal
pure
{
self.data =
(self.data & BORROWING_MASK) |
(uint256(enabled ? 1 : 0) << BORROWING_ENABLED_START_BIT_POSITION);
}
/**
* @dev Gets the borrowing state of the reserve
* @param self The reserve configuration
* @return The borrowing state
**/
function getBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self)
internal
view
returns (bool)
{
return (self.data & ~BORROWING_MASK) != 0;
}
/**
* @dev Sets the reserve factor of the reserve
* @param self The reserve configuration
* @param reserveFactor The reserve factor
**/
function setReserveFactor(DataTypes.ReserveConfigurationMap memory self, uint256 reserveFactor)
internal
pure
{
require(reserveFactor <= MAX_VALID_RESERVE_FACTOR, Errors.RC_INVALID_RESERVE_FACTOR);
self.data =
(self.data & RESERVE_FACTOR_MASK) |
(reserveFactor << RESERVE_FACTOR_START_BIT_POSITION);
}
/**
* @dev Gets the reserve factor of the reserve
* @param self The reserve configuration
* @return The reserve factor
**/
function getReserveFactor(DataTypes.ReserveConfigurationMap storage self)
internal
view
returns (uint256)
{
return (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION;
}
/**
* @dev Gets the configuration flags of the reserve
* @param self The reserve configuration
* @return The state flags representing active, frozen, borrowing enabled
**/
function getFlags(DataTypes.ReserveConfigurationMap storage self)
internal
view
returns (
bool,
bool,
bool
)
{
uint256 dataLocal = self.data;
return (
(dataLocal & ~ACTIVE_MASK) != 0,
(dataLocal & ~FROZEN_MASK) != 0,
(dataLocal & ~BORROWING_MASK) != 0
);
}
/**
* @dev Gets the configuration paramters of the reserve
* @param self The reserve configuration
* @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
**/
function getParams(DataTypes.ReserveConfigurationMap storage self)
internal
view
returns (
uint256,
uint256,
uint256,
uint256,
uint256
)
{
uint256 dataLocal = self.data;
return (
dataLocal & ~LTV_MASK,
(dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
(dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
(dataLocal & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
(dataLocal & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
);
}
/**
* @dev Gets the configuration paramters of the reserve from a memory object
* @param self The reserve configuration
* @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
**/
function getParamsMemory(DataTypes.ReserveConfigurationMap memory self)
internal
pure
returns (
uint256,
uint256,
uint256,
uint256,
uint256
)
{
return (
self.data & ~LTV_MASK,
(self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
(self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
(self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
(self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
);
}
/**
* @dev Gets the configuration flags of the reserve from a memory object
* @param self The reserve configuration
* @return The state flags representing active, frozen, borrowing enabled
**/
function getFlagsMemory(DataTypes.ReserveConfigurationMap memory self)
internal
pure
returns (
bool,
bool,
bool
)
{
return (
(self.data & ~ACTIVE_MASK) != 0,
(self.data & ~FROZEN_MASK) != 0,
(self.data & ~BORROWING_MASK) != 0
);
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {SafeMath} from './SafeMath.sol';
import {IERC20} from './IERC20.sol';
import {SafeERC20} from './SafeERC20.sol';
import {IXToken} from './IXToken.sol';
import {IVariableDebtToken} from './IVariableDebtToken.sol';
import {IReserveInterestRateStrategy} from './IReserveInterestRateStrategy.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {MathUtils} from './MathUtils.sol';
import {WadRayMath} from './WadRayMath.sol';
import {PercentageMath} from './PercentageMath.sol';
import {Errors} from './Errors.sol';
import {DataTypes} from './DataTypes.sol';
/**
* @title ReserveLogic library
* @author Lever
* @notice Implements the logic to update the reserves state
*/
library ReserveLogic {
using SafeMath for uint256;
using WadRayMath for uint256;
using PercentageMath for uint256;
using SafeERC20 for IERC20;
/**
* @dev Emitted when the state of a reserve is updated
* @param asset The address of the underlying asset of the reserve
* @param liquidityRate The new liquidity rate
* @param variableBorrowRate The new variable borrow rate
* @param liquidityIndex The new liquidity index
* @param variableBorrowIndex The new variable borrow index
**/
event ReserveDataUpdated(
address indexed asset,
uint256 liquidityRate,
uint256 variableBorrowRate,
uint256 liquidityIndex,
uint256 variableBorrowIndex
);
using ReserveLogic for DataTypes.ReserveData;
using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
/**
* @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 asset one unit of income has been accrued
* @param reserve The reserve object
* @return the normalized income. expressed in ray
**/
function getNormalizedIncome(DataTypes.ReserveData storage reserve)
internal
view
returns (uint256)
{
uint40 timestamp = reserve.lastUpdateTimestamp;
//solium-disable-next-line
if (timestamp == uint40(block.timestamp)) {
//if the index was updated in the same block, no need to perform any calculation
return reserve.liquidityIndex;
}
uint256 cumulated =
MathUtils.calculateLinearInterest(reserve.currentLiquidityRate, timestamp).rayMul(
reserve.liquidityIndex
);
return cumulated;
}
/**
* @dev Returns the ongoing normalized variable debt for the reserve
* A value of 1e27 means there is no debt. As time passes, the income is accrued
* A value of 2*1e27 means that for each unit of debt, one unit worth of interest has been accumulated
* @param reserve The reserve object
* @return The normalized variable debt. expressed in ray
**/
function getNormalizedDebt(DataTypes.ReserveData storage reserve)
internal
view
returns (uint256)
{
uint40 timestamp = reserve.lastUpdateTimestamp;
//solium-disable-next-line
if (timestamp == uint40(block.timestamp)) {
//if the index was updated in the same block, no need to perform any calculation
return reserve.variableBorrowIndex;
}
uint256 cumulated =
MathUtils.calculateCompoundedInterest(reserve.currentVariableBorrowRate, timestamp).rayMul(
reserve.variableBorrowIndex
);
return cumulated;
}
/**
* @dev Updates the liquidity cumulative index and the variable borrow index.
* @param reserve the reserve object
**/
function updateState(DataTypes.ReserveData storage reserve) internal {
uint256 scaledVariableDebt =
IVariableDebtToken(reserve.variableDebtTokenAddress).scaledTotalSupply();
uint256 previousVariableBorrowIndex = reserve.variableBorrowIndex;
uint256 previousLiquidityIndex = reserve.liquidityIndex;
uint40 lastUpdatedTimestamp = reserve.lastUpdateTimestamp;
(uint256 newLiquidityIndex, uint256 newVariableBorrowIndex) =
_updateIndexes(
reserve,
scaledVariableDebt,
previousLiquidityIndex,
previousVariableBorrowIndex,
lastUpdatedTimestamp
);
_mintToTreasury(
reserve,
scaledVariableDebt,
previousVariableBorrowIndex,
newLiquidityIndex,
newVariableBorrowIndex
);
}
/**
* @dev Accumulates a predefined amount of asset to the reserve as a fixed, instantaneous income. Used for example to accumulate
* the flashloan fee to the reserve, and spread it between all the depositors
* @param reserve The reserve object
* @param totalLiquidity The total liquidity available in the reserve
* @param amount The amount to accomulate
**/
function cumulateToLiquidityIndex(
DataTypes.ReserveData storage reserve,
uint256 totalLiquidity,
uint256 amount
) internal {
uint256 amountToLiquidityRatio = amount.wadToRay().rayDiv(totalLiquidity.wadToRay());
uint256 result = amountToLiquidityRatio.add(WadRayMath.ray());
result = result.rayMul(reserve.liquidityIndex);
require(result <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW);
reserve.liquidityIndex = uint128(result);
}
/**
* @dev Initializes a reserve
* @param reserve The reserve object
* @param xTokenAddress The address of the overlying xtoken contract
* @param interestRateStrategyAddress The address of the interest rate strategy contract
**/
function init(
DataTypes.ReserveData storage reserve,
address xTokenAddress,
address variableDebtTokenAddress,
address interestRateStrategyAddress
) external {
require(reserve.xTokenAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED);
reserve.liquidityIndex = uint128(WadRayMath.ray());
reserve.variableBorrowIndex = uint128(WadRayMath.ray());
reserve.xTokenAddress = xTokenAddress;
reserve.variableDebtTokenAddress = variableDebtTokenAddress;
reserve.interestRateStrategyAddress = interestRateStrategyAddress;
}
struct UpdateInterestRatesLocalVars {
uint256 availableLiquidity;
uint256 newLiquidityRate;
uint256 newVariableRate;
uint256 totalVariableDebt;
}
/**
* @dev Updates the reserve current variable borrow rate and the current liquidity rate
* @param reserve The address of the reserve to be updated
* @param liquidityAdded The amount of liquidity added to the protocol (deposit or repay) in the previous action
* @param liquidityTaken The amount of liquidity taken from the protocol (redeem or borrow)
**/
function updateInterestRates(
DataTypes.ReserveData storage reserve,
address reserveAddress,
address xTokenAddress,
uint256 liquidityAdded,
uint256 liquidityTaken
) internal {
UpdateInterestRatesLocalVars memory vars;
//calculates the total variable debt locally using the scaled total supply instead
//of totalSupply(), as it's noticeably cheaper. Also, the index has been
//updated by the previous updateState() call
vars.totalVariableDebt = IVariableDebtToken(reserve.variableDebtTokenAddress)
.scaledTotalSupply()
.rayMul(reserve.variableBorrowIndex);
vars.availableLiquidity = IERC20(reserveAddress).balanceOf(xTokenAddress);
(
vars.newLiquidityRate,
vars.newVariableRate
) = IReserveInterestRateStrategy(reserve.interestRateStrategyAddress).calculateInterestRates(
vars.availableLiquidity.add(liquidityAdded).sub(liquidityTaken),
vars.totalVariableDebt,
reserve.configuration.getReserveFactor()
);
require(vars.newLiquidityRate <= type(uint128).max, Errors.RL_LIQUIDITY_RATE_OVERFLOW);
require(vars.newVariableRate <= type(uint128).max, Errors.RL_VARIABLE_BORROW_RATE_OVERFLOW);
reserve.currentLiquidityRate = uint128(vars.newLiquidityRate);
reserve.currentVariableBorrowRate = uint128(vars.newVariableRate);
emit ReserveDataUpdated(
reserveAddress,
vars.newLiquidityRate,
vars.newVariableRate,
reserve.liquidityIndex,
reserve.variableBorrowIndex
);
}
struct MintToTreasuryLocalVars {
uint256 currentVariableDebt;
uint256 previousVariableDebt;
uint256 totalDebtAccrued;
uint256 amountToMint;
uint256 reserveFactor;
}
/**
* @dev Mints part of the repaid interest to the reserve treasury as a function of the reserveFactor for the
* specific asset.
* @param reserve The reserve reserve to be updated
* @param scaledVariableDebt The current scaled total variable debt
* @param previousVariableBorrowIndex The variable borrow index before the last accumulation of the interest
* @param newLiquidityIndex The new liquidity index
* @param newVariableBorrowIndex The variable borrow index after the last accumulation of the interest
**/
function _mintToTreasury(
DataTypes.ReserveData storage reserve,
uint256 scaledVariableDebt,
uint256 previousVariableBorrowIndex,
uint256 newLiquidityIndex,
uint256 newVariableBorrowIndex
) internal {
MintToTreasuryLocalVars memory vars;
vars.reserveFactor = reserve.configuration.getReserveFactor();
if (vars.reserveFactor == 0) {
return;
}
//calculate the last principal variable debt
vars.previousVariableDebt = scaledVariableDebt.rayMul(previousVariableBorrowIndex);
//calculate the new total supply after accumulation of the index
vars.currentVariableDebt = scaledVariableDebt.rayMul(newVariableBorrowIndex);
//debt accrued is the sum of the current debt minus the sum of the debt at the last update
vars.totalDebtAccrued = vars
.currentVariableDebt
.sub(vars.previousVariableDebt);
vars.amountToMint = vars.totalDebtAccrued.percentMul(vars.reserveFactor);
if (vars.amountToMint != 0) {
IXToken(reserve.xTokenAddress).mintToTreasury(vars.amountToMint, newLiquidityIndex);
}
}
/**
* @dev Updates the reserve indexes and the timestamp of the update
* @param reserve The reserve reserve to be updated
* @param scaledVariableDebt The scaled variable debt
* @param liquidityIndex The last stored liquidity index
* @param variableBorrowIndex The last stored variable borrow index
**/
function _updateIndexes(
DataTypes.ReserveData storage reserve,
uint256 scaledVariableDebt,
uint256 liquidityIndex,
uint256 variableBorrowIndex,
uint40 timestamp
) internal returns (uint256, uint256) {
uint256 currentLiquidityRate = reserve.currentLiquidityRate;
uint256 newLiquidityIndex = liquidityIndex;
uint256 newVariableBorrowIndex = variableBorrowIndex;
//only cumulating if there is any income being produced
if (currentLiquidityRate > 0) {
uint256 cumulatedLiquidityInterest =
MathUtils.calculateLinearInterest(currentLiquidityRate, timestamp);
newLiquidityIndex = cumulatedLiquidityInterest.rayMul(liquidityIndex);
require(newLiquidityIndex <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW);
reserve.liquidityIndex = uint128(newLiquidityIndex);
//we need to ensure that there is actual variable debt before accumulating
if (scaledVariableDebt != 0) {
uint256 cumulatedVariableBorrowInterest =
MathUtils.calculateCompoundedInterest(reserve.currentVariableBorrowRate, timestamp);
newVariableBorrowIndex = cumulatedVariableBorrowInterest.rayMul(variableBorrowIndex);
require(
newVariableBorrowIndex <= type(uint128).max,
Errors.RL_VARIABLE_BORROW_INDEX_OVERFLOW
);
reserve.variableBorrowIndex = uint128(newVariableBorrowIndex);
}
}
//solium-disable-next-line
reserve.lastUpdateTimestamp = uint40(block.timestamp);
return (newLiquidityIndex, newVariableBorrowIndex);
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
import {IERC20} from './IERC20.sol';
import {SafeMath} from './SafeMath.sol';
import {Address} from './Address.sol';
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
'SafeERC20: approve from non-zero to non-zero allowance'
);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function callOptionalReturn(IERC20 token, bytes memory data) private {
require(address(token).isContract(), 'SafeERC20: call to non-contract');
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, 'SafeERC20: low-level call failed');
if (returndata.length > 0) {
// Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), 'SafeERC20: ERC20 operation did not succeed');
}
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, 'SafeMath: addition overflow');
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, 'SafeMath: subtraction overflow');
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, 'SafeMath: multiplication overflow');
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, 'SafeMath: division by zero');
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, 'SafeMath: modulo by zero');
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
library StringLib {
function concat(string memory a, string memory b) internal pure returns (string memory) {
return string(abi.encodePacked(a, b));
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import './BaseUpgradeabilityProxy.sol';
/**
* @title UpgradeabilityProxy
* @dev Extends BaseUpgradeabilityProxy with a constructor for initializing
* implementation and init data.
*/
contract UpgradeabilityProxy is BaseUpgradeabilityProxy {
/**
* @dev Contract constructor.
* @param _logic Address of the initial implementation.
* @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
* It should include the signature and the parameters of the function to be called, as described in
* https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
* This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
*/
constructor(address _logic, bytes memory _data) public payable {
assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1));
_setImplementation(_logic);
if (_data.length > 0) {
(bool success, ) = _logic.delegatecall(_data);
require(success);
}
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {Errors} from './Errors.sol';
import {DataTypes} from './DataTypes.sol';
/**
* @title UserConfiguration library
* @author Lever
* @notice Implements the bitmap logic to handle the user configuration
*/
library UserConfiguration {
uint256 internal constant BORROWING_MASK =
0x5555555555555555555555555555555555555555555555555555555555555555;
/**
* @dev Sets if the user is borrowing the reserve identified by reserveIndex
* @param self The configuration object
* @param reserveIndex The index of the reserve in the bitmap
* @param borrowing True if the user is borrowing the reserve, false otherwise
**/
function setBorrowing(
DataTypes.UserConfigurationMap storage self,
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));
}
/**
* @dev Sets if the user is using as collateral the reserve identified by reserveIndex
* @param self The configuration object
* @param reserveIndex The index of the reserve in the bitmap
* @param usingAsCollateral True if the user is usin the reserve as collateral, false otherwise
**/
function setUsingAsCollateral(
DataTypes.UserConfigurationMap storage self,
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));
}
/**
* @dev Used to validate if a user has been using the reserve for borrowing or as collateral
* @param self The configuration object
* @param reserveIndex The index of the reserve in the bitmap
* @return True if the user has been using a reserve for borrowing or as collateral, false otherwise
**/
function isUsingAsCollateralOrBorrowing(
DataTypes.UserConfigurationMap memory self,
uint256 reserveIndex
) internal pure returns (bool) {
require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
return (self.data >> (reserveIndex * 2)) & 3 != 0;
}
/**
* @dev Used to validate if a user has been using the reserve for borrowing
* @param self The configuration object
* @param reserveIndex The index of the reserve in the bitmap
* @return True if the user has been using a reserve for borrowing, false otherwise
**/
function isBorrowing(DataTypes.UserConfigurationMap memory self, uint256 reserveIndex)
internal
pure
returns (bool)
{
require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
return (self.data >> (reserveIndex * 2)) & 1 != 0;
}
/**
* @dev Used to validate if a user has been using the reserve as collateral
* @param self The configuration object
* @param reserveIndex The index of the reserve in the bitmap
* @return True if the user has been using a reserve as collateral, false otherwise
**/
function isUsingAsCollateral(DataTypes.UserConfigurationMap memory self, uint256 reserveIndex)
internal
pure
returns (bool)
{
require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
return (self.data >> (reserveIndex * 2 + 1)) & 1 != 0;
}
/**
* @dev Used to validate if a user has been borrowing from any reserve
* @param self The configuration object
* @return True if the user has been borrowing any reserve, false otherwise
**/
function isBorrowingAny(DataTypes.UserConfigurationMap memory self) internal pure returns (bool) {
return self.data & BORROWING_MASK != 0;
}
/**
* @dev Used to validate if a user has not been using any reserve
* @param self The configuration object
* @return True if the user has been borrowing any reserve, false otherwise
**/
function isEmpty(DataTypes.UserConfigurationMap memory self) internal pure returns (bool) {
return self.data == 0;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import {SafeMath} from "./SafeMath.sol";
import {IERC20} from "./IERC20.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {WadRayMath} from "./WadRayMath.sol";
import {PercentageMath} from "./PercentageMath.sol";
import {SafeERC20} from "./SafeERC20.sol";
import {ReserveConfiguration} from "./ReserveConfiguration.sol";
import {UserConfiguration} from "./UserConfiguration.sol";
import {Errors} from "./Errors.sol";
import {Helpers} from "./Helpers.sol";
import {IReserveInterestRateStrategy} from "./IReserveInterestRateStrategy.sol";
import {DataTypes} from "./DataTypes.sol";
/**
* @title ReserveLogic library
* @author Lever
* @notice Implements functions to validate the different actions of the protocol
*/
library ValidationLogic {
using ReserveLogic for DataTypes.ReserveData;
using SafeMath for uint256;
using WadRayMath for uint256;
using PercentageMath for uint256;
using SafeERC20 for IERC20;
using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
using UserConfiguration for DataTypes.UserConfigurationMap;
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 action
* @param reserve The reserve object on which the user is depositing
* @param amount The amount to be deposited
*/
function validateDeposit(DataTypes.ReserveData storage reserve, uint256 amount) external view {
(bool isActive, bool isFrozen,) = reserve.configuration.getFlags();
require(amount != 0, Errors.VL_INVALID_AMOUNT);
require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
require(!isFrozen, Errors.VL_RESERVE_FROZEN);
}
/**
* @dev Validates a withdraw action
* @param reserveAddress The address of the reserve
* @param amount The amount to be withdrawn
* @param userBalance The balance of the user
* @param reservesData The reserves state
* @param userConfig The user configuration
* @param reserves The addresses of the reserves
* @param reservesCount The number of reserves
* @param oracle The price oracle
*/
function validateWithdraw(
address reserveAddress,
uint256 amount,
uint256 userBalance,
mapping(address => DataTypes.ReserveData) storage reservesData,
DataTypes.UserConfigurationMap storage userConfig,
mapping(uint256 => address) storage reserves,
uint256 reservesCount,
address oracle
) external view {
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,
msg.sender,
amount,
reservesData,
userConfig,
reserves,
reservesCount,
oracle
),
Errors.VL_TRANSFER_NOT_ALLOWED
);
}
struct ValidateBorrowLocalVars {
uint256 currentLtv;
uint256 currentLiquidationThreshold;
uint256 amountOfCollateralNeededETH;
uint256 userCollateralBalanceETH;
uint256 userBorrowBalanceETH;
uint256 availableLiquidity;
uint256 healthFactor;
bool isActive;
bool isFrozen;
bool borrowingEnabled;
}
/**
* @dev Validates a borrow action
* @param reserve The reserve state from which the user is borrowing
* @param userAddress The address of the user
* @param amount The amount to be borrowed
* @param amountInETH The amount to be borrowed, in ETH
* @param reservesData The state of all the reserves
* @param userConfig The state of the user for the specific reserve
* @param reserves The addresses of all the active reserves
* @param oracle The price oracle
*/
function validateBorrow(
DataTypes.ReserveData storage reserve,
address userAddress,
uint256 amount,
uint256 amountInETH,
mapping(address => DataTypes.ReserveData) storage reservesData,
DataTypes.UserConfigurationMap storage userConfig,
mapping(uint256 => address) storage reserves,
uint256 reservesCount,
address oracle
) external view {
ValidateBorrowLocalVars memory vars;
(vars.isActive, vars.isFrozen, vars.borrowingEnabled) = reserve
.configuration
.getFlags();
require(vars.isActive, Errors.VL_NO_ACTIVE_RESERVE);
require(!vars.isFrozen, Errors.VL_RESERVE_FROZEN);
require(amount != 0, Errors.VL_INVALID_AMOUNT);
require(vars.borrowingEnabled, Errors.VL_BORROWING_NOT_ENABLED);
(
vars.userCollateralBalanceETH,
vars.userBorrowBalanceETH,
vars.currentLtv,
vars.currentLiquidationThreshold,
vars.healthFactor
) = GenericLogic.calculateUserAccountData(
userAddress,
reservesData,
userConfig,
reserves,
reservesCount,
oracle
);
require(vars.userCollateralBalanceETH > 0, Errors.VL_COLLATERAL_BALANCE_IS_0);
require(vars.healthFactor > GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD, Errors.VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD);
//add the current already borrowed amount to the amount requested to calculate the total collateral needed.
vars.amountOfCollateralNeededETH = vars
.userBorrowBalanceETH
.add(amountInETH)
.percentDiv(vars.currentLtv); //LTV is calculated in percentage
require(
vars.amountOfCollateralNeededETH <= vars.userCollateralBalanceETH,
Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW
);
}
struct ValidateSwapLocalVars {
uint256 currentLtv;
uint256 amountOfCollateralNeededETH;
uint256 userCollateralBalanceETH;
uint256 userBorrowBalanceETH;
uint256 healthFactor;
}
/**
* @dev Validates a swap action
* @param userAddress The address of the user
* @param reservesData The state of all the reserves
* @param userConfig The state of the user for the specific reserve
* @param reserves The addresses of all the active reserves
* @param oracle The price oracle
*/
function validateSwap(
address userAddress,
mapping(address => DataTypes.ReserveData) storage reservesData,
DataTypes.UserConfigurationMap storage userConfig,
mapping(uint256 => address) storage reserves,
uint256 reservesCount,
address oracle
) external view {
ValidateSwapLocalVars memory vars;
(
vars.userCollateralBalanceETH,
vars.userBorrowBalanceETH,
vars.currentLtv,
,
vars.healthFactor
) = GenericLogic.calculateUserAccountData(
userAddress,
reservesData,
userConfig,
reserves,
reservesCount,
oracle
);
require(vars.userCollateralBalanceETH > 0, Errors.VL_COLLATERAL_BALANCE_IS_0);
require(vars.healthFactor > GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD, Errors.VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD);
//the current already borrowed amount requested to calculate the total collateral needed.
vars.amountOfCollateralNeededETH = vars.userBorrowBalanceETH.percentDiv(vars.currentLtv); //LTV is calculated in percentage
require(
vars.amountOfCollateralNeededETH <= vars.userCollateralBalanceETH,
Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW
);
}
/**
* @dev Validates a repay action
* @param reserve The reserve state from which the user is repaying
* @param amountSent The amount sent for the repayment. Can be an actual value or uint(-1)
* @param onBehalfOf The address of the user msg.sender is repaying for
* @param variableDebt The borrow balance of the user
*/
function validateRepay(
DataTypes.ReserveData storage reserve,
uint256 amountSent,
address onBehalfOf,
uint256 variableDebt,
uint256 userBalance
) external view {
bool isActive = reserve.configuration.getActive();
require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
require(amountSent > 0, Errors.VL_INVALID_AMOUNT);
require(variableDebt > 0, Errors.VL_NO_DEBT_OF_SELECTED_TYPE);
require(userBalance >= amountSent, "deposit is less than debt");
require(
amountSent != uint256(-1) || msg.sender == onBehalfOf,
Errors.VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF
);
}
/**
* @dev Validates the action of setting an asset as collateral
* @param reserve The state of the reserve that the user is enabling or disabling as collateral
* @param reserveAddress The address of the reserve
* @param reservesData The data of all the reserves
* @param userConfig The state of the user for the specific reserve
* @param reserves The addresses of all the active reserves
* @param oracle The price oracle
*/
function validateSetUseReserveAsCollateral(
DataTypes.ReserveData storage reserve,
address reserveAddress,
bool useAsCollateral,
mapping(address => DataTypes.ReserveData) storage reservesData,
DataTypes.UserConfigurationMap storage userConfig,
mapping(uint256 => address) storage reserves,
uint256 reservesCount,
address oracle
) external view {
uint256 underlyingBalance = IERC20(reserve.xTokenAddress).balanceOf(msg.sender);
require(underlyingBalance > 0, Errors.VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0);
require(
useAsCollateral ||
GenericLogic.balanceDecreaseAllowed(
reserveAddress,
msg.sender,
underlyingBalance,
reservesData,
userConfig,
reserves,
reservesCount,
oracle
),
Errors.VL_DEPOSIT_ALREADY_IN_USE
);
}
/**
* @dev Validates a flashloan action
* @param assets The assets being flashborrowed
* @param amounts The amounts for each asset being borrowed
**/
function validateFlashloan(address[] memory assets, uint256[] memory amounts) internal pure {
require(assets.length == amounts.length, Errors.VL_INCONSISTENT_FLASHLOAN_PARAMS);
}
/**
* @dev Validates the liquidation action
* @param collateralReserve The reserve data of the collateral
* @param principalReserve The reserve data of the principal
* @param userConfig The user configuration
* @param userHealthFactor The user's health factor
* @param userVariableDebt Total variable debt balance of the user
**/
function validateLiquidation(
DataTypes.ReserveData storage collateralReserve,
DataTypes.ReserveData storage principalReserve,
DataTypes.UserConfigurationMap storage userConfig,
uint256 userHealthFactor,
uint256 userVariableDebt
) external view {
require(
collateralReserve.configuration.getActive() &&
principalReserve.configuration.getActive(),
Errors.VL_NO_ACTIVE_RESERVE
);
require(
userHealthFactor < GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
Errors.MPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD
);
bool isCollateralEnabled =
collateralReserve.configuration.getLiquidationThreshold() > 0 &&
userConfig.isUsingAsCollateral(collateralReserve.id);
//if collateral isn't enabled as collateral by user, it cannot be liquidated
require(
isCollateralEnabled,
Errors.MPCM_COLLATERAL_CANNOT_BE_LIQUIDATED
);
require(
userVariableDebt > 0,
Errors.MPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER
);
}
/**
* @dev Validates an xToken transfer
* @param from The user from which the xTokens are being transferred
* @param reservesData The state of all the reserves
* @param userConfig The state of the user for the specific reserve
* @param reserves The addresses of all the active reserves
* @param oracle The price oracle
*/
function validateTransfer(
address from,
mapping(address => DataTypes.ReserveData) storage reservesData,
DataTypes.UserConfigurationMap storage userConfig,
mapping(uint256 => address) storage reserves,
uint256 reservesCount,
address oracle
) internal view {
(, , , , uint256 healthFactor) =
GenericLogic.calculateUserAccountData(
from,
reservesData,
userConfig,
reserves,
reservesCount,
oracle
);
require(
healthFactor >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
Errors.VL_TRANSFER_NOT_ALLOWED
);
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IVariableDebtToken} from "./IVariableDebtToken.sol";
import {WadRayMath} from "./WadRayMath.sol";
import {Errors} from "./Errors.sol";
import {DebtTokenBase} from "./DebtTokenBase.sol";
import {SafeMath} from "./SafeMath.sol";
import {
IMarginPoolAddressesProvider
} from "./IMarginPoolAddressesProvider.sol";
import {IERC20} from "./IERC20.sol";
import {SafeERC20} from "./SafeERC20.sol";
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow, so we distribute
return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
}
}
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
* available, which can be aplied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*/
contract ReentrancyGuard {
/// @dev counter to allow mutex lock with only one SSTORE operation
uint256 private _guardCounter;
constructor() internal {
// The counter starts at one to prevent changing it from zero to a non-zero
// value, which is a more expensive operation.
_guardCounter = 1;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_guardCounter += 1;
uint256 localCounter = _guardCounter;
_;
require(
localCounter == _guardCounter,
"ReentrancyGuard: reentrant call"
);
}
}
/**
* @title VariableDebtToken
* @notice Implements a variable debt token to track the borrowing positions of users
* at variable rate mode
* @author Lever
**/
contract VariableDebtToken is DebtTokenBase, IVariableDebtToken, ReentrancyGuard {
using WadRayMath for uint256;
using SafeERC20 for IERC20;
uint256 public constant DEBT_TOKEN_REVISION = 0x1;
// address public rewardsDistribution;
IERC20 public rewardsToken;
uint256 public periodFinish = 0;
uint256 public rewardRate = 0;
uint256 public rewardsDuration = 30 days;
uint256 public lastUpdateTime;
uint256 public rewardPerTokenStored;
mapping(address => uint256) public userRewardPerTokenPaid;
mapping(address => uint256) public rewards;
IMarginPoolAddressesProvider public addressesProvider;
constructor(
address _addressesProvider,
address underlyingAsset,
string memory name,
string memory symbol,
uint8 decimals
)
public
DebtTokenBase(
IMarginPoolAddressesProvider(_addressesProvider).getMarginPool(),
underlyingAsset,
name,
symbol,
decimals
)
{
// rewardsDistribution = IMarginPoolAddressesProvider(_addressesProvider).getRewardsDistribution();
addressesProvider = IMarginPoolAddressesProvider(_addressesProvider);
rewardsToken = IERC20(IMarginPoolAddressesProvider(_addressesProvider).getLeverToken());
}
/* ========== MODIFIERS ========== */
modifier updateReward(address account) {
rewardPerTokenStored = rewardPerToken();
lastUpdateTime = lastTimeRewardApplicable();
if (account != address(0)) {
rewards[account] = earned(account);
userRewardPerTokenPaid[account] = rewardPerTokenStored;
}
_;
}
modifier onlyRewardsDistribution() {
require(
msg.sender == addressesProvider.getRewardsDistribution(),
"Caller is not RewardsDistribution contract"
);
_;
}
/**
* @dev Calculates the accumulated debt balance of the user
* @return The debt balance of the user
**/
function balanceOf(address user)
public
view
virtual
override
returns (uint256)
{
uint256 scaledBalance = super.balanceOf(user);
if (scaledBalance == 0) {
return 0;
}
return
scaledBalance.rayMul(
POOL.getReserveNormalizedVariableDebt(UNDERLYING_ASSET_ADDRESS)
);
}
/**
* @dev Mints debt token to the `onBehalfOf` address
* - Only callable by the MarginPool
* @param user The address receiving the borrowed underlying, being the delegatee in case
* of credit delegate, or same as `onBehalfOf` otherwise
* @param onBehalfOf The address receiving the debt tokens
* @param amount The amount of debt being minted
* @param index The variable debt index of the reserve
* @return `true` if the the previous balance of the user is 0
**/
function mint(
address user,
address onBehalfOf,
uint256 amount,
uint256 index
) external override onlyMarginPool updateReward(onBehalfOf) returns (bool) {
if (user != onBehalfOf) {
_decreaseBorrowAllowance(onBehalfOf, user, amount);
}
uint256 previousBalance = super.balanceOf(onBehalfOf);
uint256 amountScaled = amount.rayDiv(index);
require(amountScaled != 0, Errors.CT_INVALID_MINT_AMOUNT);
_mint(onBehalfOf, amountScaled);
emit Transfer(address(0), onBehalfOf, amount);
emit Mint(user, onBehalfOf, amount, index);
return previousBalance == 0;
}
/**
* @dev Burns user variable debt
* - Only callable by the MarginPool
* @param user The user whose debt is getting burned
* @param amount The amount getting burned
* @param index The variable debt index of the reserve
**/
function burn(
address user,
uint256 amount,
uint256 index
) external override onlyMarginPool updateReward(user) {
uint256 amountScaled = amount.rayDiv(index);
require(amountScaled != 0, Errors.CT_INVALID_BURN_AMOUNT);
_burn(user, amountScaled);
emit Transfer(user, address(0), amount);
emit Burn(user, amount, index);
}
/**
* @dev Returns the principal debt balance of the user from
* @return The debt balance of the user since the last burn/mint action
**/
function scaledBalanceOf(address user)
public
view
virtual
override
returns (uint256)
{
return super.balanceOf(user);
}
/**
* @dev Returns the total supply of the variable debt token. Represents the total debt accrued by the users
* @return The total supply
**/
function totalSupply() public view virtual override returns (uint256) {
return
super.totalSupply().rayMul(
POOL.getReserveNormalizedVariableDebt(UNDERLYING_ASSET_ADDRESS)
);
}
/**
* @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
* @return the scaled total supply
**/
function scaledTotalSupply()
public
view
virtual
override
returns (uint256)
{
return super.totalSupply();
}
/**
* @dev Returns the principal balance of the user and principal total supply.
* @param user The address of the user
* @return The principal balance of the user
* @return The principal total supply
**/
function getScaledUserBalanceAndSupply(address user)
external
view
override
returns (uint256, uint256)
{
return (super.balanceOf(user), super.totalSupply());
}
function _transfer(
address from,
address to,
uint256 amount
) internal override updateReward(from) updateReward(to) {
super._transfer(from, to, amount);
}
function lastTimeRewardApplicable() public view returns (uint256) {
return Math.min(block.timestamp, periodFinish);
}
function rewardPerToken() public view returns (uint256) {
if (totalSupply() == 0) {
return rewardPerTokenStored;
}
return
rewardPerTokenStored.add(
lastTimeRewardApplicable()
.sub(lastUpdateTime)
.mul(rewardRate)
.mul(1e18)
.div(totalSupply())
);
}
function earned(address account) public view returns (uint256) {
return
balanceOf(account)
.mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
.div(1e18)
.add(rewards[account]);
}
function getRewardForDuration() external view returns (uint256) {
return rewardRate.mul(rewardsDuration);
}
function getReward() public nonReentrant updateReward(msg.sender) {
uint256 reward = rewards[msg.sender];
require(reward > 0);
rewards[msg.sender] = 0;
rewardsToken.safeTransfer(msg.sender, reward);
emit RewardPaid(msg.sender, reward);
}
/* ========== RESTRICTED FUNCTIONS ========== */
function notifyRewardAmount(uint256 reward, uint256 _rewardsDuration)
external
onlyRewardsDistribution
updateReward(address(0))
{
// Ensure the provided reward amount is not more than the balance in the contract.
// This keeps the reward rate in the right range, preventing overflows due to
// very high values of rewardRate in the earned and rewardsPerToken functions;
// Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
uint256 balance = rewardsToken.balanceOf(address(this));
if (block.timestamp >= periodFinish) {
rewardsDuration = _rewardsDuration;
rewardRate = reward.div(rewardsDuration);
require(
rewardRate <= balance.div(rewardsDuration),
"Provided reward too high"
);
periodFinish = block.timestamp.add(rewardsDuration);
} else {
uint256 remaining = periodFinish.sub(block.timestamp);
uint256 leftover = remaining.mul(rewardRate);
rewardRate = reward.add(leftover).div(remaining);
require(
rewardRate <= balance.div(remaining),
"Provided reward too high"
);
}
lastUpdateTime = block.timestamp;
emit RewardAdded(reward, _rewardsDuration);
}
/* ========== EVENTS ========== */
event RewardAdded(uint256 reward, uint256 _rewardsDuration);
event RewardPaid(address indexed user, uint256 reward);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import {VariableDebtToken} from './VariableDebtToken.sol';
import {Ownable} from './Ownable.sol';
import {StringLib} from './StringLib.sol';
contract VariableTokensHelper is Ownable {
address payable private pool;
address private addressesProvider;
event deployedContracts(address variableToken);
constructor(address payable _pool, address _addressesProvider) public {
pool = _pool;
addressesProvider = _addressesProvider;
}
function initDeployment(
address[] calldata tokens,
string[] calldata symbols,
uint8[] calldata decimals
) external onlyOwner {
require(tokens.length == symbols.length, 'Arrays not same length');
require(pool != address(0), 'Pool can not be zero address');
for (uint256 i = 0; i < tokens.length; i++) {
emit deployedContracts(
address(
new VariableDebtToken(
addressesProvider,
tokens[i],
StringLib.concat('Lever variable debt bearing ', symbols[i]),
StringLib.concat('d', symbols[i]),
decimals[i]
)
)
);
}
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
/**
* @title VersionedInitializable
*
* @dev Helper contract to implement initializer functions. To use it, replace
* the constructor with a function that has the `initializer` modifier.
* WARNING: Unlike constructors, initializer functions must be manually
* invoked. This applies both to deploying an Initializable contract, as well
* as extending an Initializable contract via inheritance.
* WARNING: When used with inheritance, manual care must be taken to not invoke
* a parent initializer twice, or ensure that all initializers are idempotent,
* because this is not dealt with automatically as with constructors.
*
* @author Lever, inspired by the OpenZeppelin Initializable contract
*/
abstract contract VersionedInitializable {
/**
* @dev Indicates that the contract has been initialized.
*/
uint256 private lastInitializedRevision = 0;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private initializing;
/**
* @dev Modifier to use in the initializer function of a contract.
*/
modifier initializer() {
uint256 revision = getRevision();
require(
initializing || isConstructor() || revision > lastInitializedRevision,
'Contract instance has already been initialized'
);
bool isTopLevelCall = !initializing;
if (isTopLevelCall) {
initializing = true;
lastInitializedRevision = revision;
}
_;
if (isTopLevelCall) {
initializing = false;
}
}
/**
* @dev returns the revision number of the contract
* Needs to be defined in the inherited class as a constant.
**/
function getRevision() internal pure virtual returns (uint256);
/**
* @dev Returns true if and only if the function is running in the constructor
**/
function isConstructor() private view returns (bool) {
// extcodesize checks the size of the code stored in an address, and
// address returns the current address. Since the code is still not
// deployed when running a constructor, any checks on its code size will
// yield zero, making it an effective way to detect if a contract is
// under construction or not.
uint256 cs;
//solium-disable-next-line
assembly {
cs := extcodesize(address())
}
return cs == 0;
}
// Reserved storage space to allow for layout changes in the future.
uint256[50] private ______gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {Errors} from './Errors.sol';
/**
* @title WadRayMath library
* @author Lever
* @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
**/
library WadRayMath {
uint256 internal constant WAD = 1e18;
uint256 internal constant halfWAD = WAD / 2;
uint256 internal constant RAY = 1e27;
uint256 internal constant halfRAY = RAY / 2;
uint256 internal constant WAD_RAY_RATIO = 1e9;
/**
* @return One ray, 1e27
**/
function ray() internal pure returns (uint256) {
return RAY;
}
/**
* @return One wad, 1e18
**/
function wad() internal pure returns (uint256) {
return WAD;
}
/**
* @return Half ray, 1e27/2
**/
function halfRay() internal pure returns (uint256) {
return halfRAY;
}
/**
* @return Half ray, 1e18/2
**/
function halfWad() internal pure returns (uint256) {
return halfWAD;
}
/**
* @dev Multiplies two wad, rounding half up to the nearest wad
* @param a Wad
* @param b Wad
* @return The result of a*b, in wad
**/
function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0 || b == 0) {
return 0;
}
require(a <= (type(uint256).max - halfWAD) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
return (a * b + halfWAD) / WAD;
}
/**
* @dev Divides two wad, rounding half up to the nearest wad
* @param a Wad
* @param b Wad
* @return The result of a/b, in wad
**/
function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
uint256 halfB = b / 2;
require(a <= (type(uint256).max - halfB) / WAD, Errors.MATH_MULTIPLICATION_OVERFLOW);
return (a * WAD + halfB) / b;
}
/**
* @dev Multiplies two ray, rounding half up to the nearest ray
* @param a Ray
* @param b Ray
* @return The result of a*b, in ray
**/
function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0 || b == 0) {
return 0;
}
require(a <= (type(uint256).max - halfRAY) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
return (a * b + halfRAY) / RAY;
}
/**
* @dev Divides two ray, rounding half up to the nearest ray
* @param a Ray
* @param b Ray
* @return The result of a/b, in ray
**/
function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
uint256 halfB = b / 2;
require(a <= (type(uint256).max - halfB) / RAY, Errors.MATH_MULTIPLICATION_OVERFLOW);
return (a * RAY + halfB) / b;
}
/**
* @dev Casts ray down to wad
* @param a Ray
* @return a casted to wad, rounded half up to the nearest wad
**/
function rayToWad(uint256 a) internal pure returns (uint256) {
uint256 halfRatio = WAD_RAY_RATIO / 2;
uint256 result = halfRatio + a;
require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW);
return result / WAD_RAY_RATIO;
}
/**
* @dev Converts wad up to ray
* @param a Wad
* @return a converted in ray
**/
function wadToRay(uint256 a) internal pure returns (uint256) {
uint256 result = a * WAD_RAY_RATIO;
require(result / WAD_RAY_RATIO == a, Errors.MATH_MULTIPLICATION_OVERFLOW);
return result;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import {Ownable} from './Ownable.sol';
import {IERC20} from './IERC20.sol';
import {IWETH} from './IWETH.sol';
import {IWETHGateway} from './IWETHGateway.sol';
import {IMarginPool} from './IMarginPool.sol';
import {IXToken} from './IXToken.sol';
import {ICreditDelegationToken} from './ICreditDelegationToken.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {UserConfiguration} from './UserConfiguration.sol';
import {Helpers} from './Helpers.sol';
import {DataTypes} from './DataTypes.sol';
contract WETHGateway is IWETHGateway, Ownable {
using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
using UserConfiguration for DataTypes.UserConfigurationMap;
IWETH internal immutable WETH;
IMarginPool internal immutable POOL;
IXToken internal immutable xWETH;
ICreditDelegationToken internal immutable dWETH;
/**
* @dev Sets the WETH address and the MarginPoolAddressesProvider address. Infinite approves margin pool.
* @param weth Address of the Wrapped Ether contract
* @param pool Address of the MarginPool contract
**/
constructor(address weth, address pool) public {
IMarginPool poolInstance = IMarginPool(pool);
WETH = IWETH(weth);
POOL = poolInstance;
xWETH = IXToken(poolInstance.getReserveData(weth).xTokenAddress);
dWETH = ICreditDelegationToken(poolInstance.getReserveData(weth).variableDebtTokenAddress);
IWETH(weth).approve(pool, uint256(-1));
}
/**
* @dev deposits WETH into the reserve, using native ETH. A corresponding amount of the overlying asset (xTokens)
* is minted.
* @param onBehalfOf address of the user who will receive the xTokens representing the deposit
**/
function depositETH(address onBehalfOf) external payable override {
WETH.deposit{value: msg.value}();
POOL.deposit(address(WETH), msg.value, onBehalfOf);
}
/**
* @dev withdraws the WETH _reserves of msg.sender.
* @param amount amount of xWETH to withdraw and receive native ETH
* @param to address of the user who will receive native ETH
*/
function withdrawETH(uint256 amount, address to) external override {
uint256 userBalance = xWETH.balanceOf(msg.sender);
uint256 amountToWithdraw = amount;
// if amount is equal to uint(-1), the user wants to redeem everything
if (amount == type(uint256).max) {
amountToWithdraw = userBalance;
}
xWETH.transferFrom(msg.sender, address(this), amountToWithdraw);
POOL.withdraw(address(WETH), amountToWithdraw, address(this));
WETH.withdraw(amountToWithdraw);
_safeTransferETH(to, amountToWithdraw);
}
/**
* @dev borrow WETH, unwraps to ETH and send both the ETH and DebtTokens to msg.sender, via `approveDelegation` and onBehalf argument in `MarginPool.borrow`.
* @param amount the amount of ETH to borrow
*/
function borrowETH(
uint256 amount
) external override {
POOL.borrow(address(WETH), amount, msg.sender);
WETH.withdraw(amount);
_safeTransferETH(msg.sender, amount);
}
/**
* @dev transfer ETH to an address, revert if it fails.
* @param to recipient of the transfer
* @param value the amount to send
*/
function _safeTransferETH(address to, uint256 value) internal {
(bool success, ) = to.call{value: value}(new bytes(0));
require(success, 'ETH_TRANSFER_FAILED');
}
/**
* @dev transfer ERC20 from the utility contract, for ERC20 recovery in case of stuck tokens due
* direct transfers to the contract address.
* @param token token to transfer
* @param to recipient of the transfer
* @param amount amount to send
*/
function emergencyTokenTransfer(
address token,
address to,
uint256 amount
) external onlyOwner {
IERC20(token).transfer(to, amount);
}
/**
* @dev transfer native Ether from the utility contract, for native Ether recovery in case of stuck Ether
* due selfdestructs or transfer ether to pre-computated contract address before deployment.
* @param to recipient of the transfer
* @param amount amount to send
*/
function emergencyEtherTransfer(address to, uint256 amount) external onlyOwner {
_safeTransferETH(to, amount);
}
/**
* @dev Get WETH address used by WETHGateway
*/
function getWETHAddress() external view returns (address) {
return address(WETH);
}
/**
* @dev Get xWETH address used by WETHGateway
*/
function getXWETHAddress() external view returns (address) {
return address(xWETH);
}
/**
* @dev Get MarginPool address used by WETHGateway
*/
function getMarginPoolAddress() external view returns (address) {
return address(POOL);
}
/**
* @dev Only WETH contract is allowed to transfer ETH here. Prevent other addresses to send Ether to this contract.
*/
receive() external payable {
require(msg.sender == address(WETH), 'Receive not allowed');
}
/**
* @dev Revert fallback calls
*/
fallback() external payable {
revert('Fallback not allowed');
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
import {IERC20} from "./IERC20.sol";
import {SafeERC20} from "./SafeERC20.sol";
import {IMarginPool} from "./IMarginPool.sol";
import {IXToken} from "./IXToken.sol";
import {WadRayMath} from "./WadRayMath.sol";
import {Errors} from "./Errors.sol";
import {IncentivizedERC20} from "./IncentivizedERC20.sol";
import {SafeMath} from "./SafeMath.sol";
import {
IMarginPoolAddressesProvider
} from "./IMarginPoolAddressesProvider.sol";
import {Address} from "./Address.sol";
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow, so we distribute
return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
}
}
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
* available, which can be aplied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*/
contract ReentrancyGuard {
/// @dev counter to allow mutex lock with only one SSTORE operation
uint256 private _guardCounter;
constructor() internal {
// The counter starts at one to prevent changing it from zero to a non-zero
// value, which is a more expensive operation.
_guardCounter = 1;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_guardCounter += 1;
uint256 localCounter = _guardCounter;
_;
require(
localCounter == _guardCounter,
"ReentrancyGuard: reentrant call"
);
}
}
/**
* @title Lever ERC20 XToken
* @dev Implementation of the interest bearing token for the Lever protocol
* @author Lever
*/
contract XToken is
IncentivizedERC20,
IXToken,
ReentrancyGuard
{
using WadRayMath for uint256;
using SafeERC20 for IERC20;
// address public rewardsDistribution;
IERC20 public rewardsToken;
uint256 public periodFinish = 0;
uint256 public rewardRate = 0;
uint256 public rewardsDuration = 30 days;
uint256 public lastUpdateTime;
uint256 public rewardPerTokenStored;
mapping(address => uint256) public userRewardPerTokenPaid;
mapping(address => uint256) public rewards;
bytes public constant EIP712_REVISION = bytes("1");
bytes32 internal constant EIP712_DOMAIN =
keccak256(
"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
);
bytes32 public constant PERMIT_TYPEHASH =
keccak256(
"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
);
uint256 public constant UINT_MAX_VALUE = uint256(-1);
address public immutable UNDERLYING_ASSET_ADDRESS;
address public immutable RESERVE_TREASURY_ADDRESS;
IMarginPool public immutable POOL;
IMarginPoolAddressesProvider public addressesProvider;
/// @dev owner => next valid nonce to submit with permit()
mapping(address => uint256) public _nonces;
bytes32 public DOMAIN_SEPARATOR;
/* ========== MODIFIERS ========== */
modifier updateReward(address account) {
rewardPerTokenStored = rewardPerToken();
lastUpdateTime = lastTimeRewardApplicable();
if (account != address(0)) {
rewards[account] = earned(account);
userRewardPerTokenPaid[account] = rewardPerTokenStored;
}
_;
}
modifier onlyRewardsDistribution() {
require(
msg.sender == addressesProvider.getRewardsDistribution(),
"Caller is not RewardsDistribution contract"
);
_;
}
modifier onlyMarginPool {
require(
_msgSender() == address(POOL),
Errors.CT_CALLER_MUST_BE_MARGIN_POOL
);
_;
}
constructor(
address _addressesProvider,
address underlyingAssetAddress,
string memory tokenName,
string memory tokenSymbol,
uint8 decimals
) public IncentivizedERC20(tokenName, tokenSymbol, decimals) {
addressesProvider = IMarginPoolAddressesProvider(_addressesProvider);
POOL = IMarginPool(addressesProvider.getMarginPool());
UNDERLYING_ASSET_ADDRESS = underlyingAssetAddress;
RESERVE_TREASURY_ADDRESS = addressesProvider.getTreasuryAddress();
// rewardsDistribution = addressesProvider.getRewardsDistribution();
rewardsToken = IERC20(IMarginPoolAddressesProvider(_addressesProvider).getLeverToken());
}
/**
* @dev Burns xTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
* - Only callable by the MarginPool, as extra state updates there need to be managed
* @param user The owner of the xTokens, getting them burned
* @param receiverOfUnderlying The address that will receive the underlying
* @param amount The amount being burned
* @param index The new liquidity index of the reserve
**/
function burn(
address user,
address receiverOfUnderlying,
uint256 amount,
uint256 index
) external override onlyMarginPool updateReward(user) {
uint256 amountScaled = amount.rayDiv(index);
require(amountScaled != 0, Errors.CT_INVALID_BURN_AMOUNT);
_burn(user, amountScaled);
if (receiverOfUnderlying != address(this)) {
IERC20(UNDERLYING_ASSET_ADDRESS).safeTransfer(
receiverOfUnderlying,
amount
);
}
emit Transfer(user, address(0), amount);
emit Burn(user, receiverOfUnderlying, amount, index);
}
/**
* @dev Mints `amount` xTokens to `user`
* - Only callable by the MarginPool, as extra state updates there need to be managed
* @param user The address receiving the minted tokens
* @param amount The amount of tokens getting minted
* @param index The new liquidity index of the reserve
* @return `true` if the the previous balance of the user was 0
*/
function mint(
address user,
uint256 amount,
uint256 index
) external override onlyMarginPool updateReward(user) returns (bool) {
uint256 previousBalance = super.balanceOf(user);
uint256 amountScaled = amount.rayDiv(index);
require(amountScaled != 0, Errors.CT_INVALID_MINT_AMOUNT);
_mint(user, amountScaled);
emit Transfer(address(0), user, amount);
emit Mint(user, amount, index);
return previousBalance == 0;
}
/**
* @dev Mints xTokens to the reserve treasury
* - Only callable by the MarginPool
* @param amount The amount of tokens getting minted
* @param index The new liquidity index of the reserve
*/
function mintToTreasury(uint256 amount, uint256 index)
external
override
onlyMarginPool
updateReward(RESERVE_TREASURY_ADDRESS)
{
if (amount == 0) {
return;
}
// Compared to the normal mint, we don't check for rounding errors.
// The amount to mint can easily be very small since it is a fraction of the interest ccrued.
// In that case, the treasury will experience a (very small) loss, but it
// wont cause potentially valid transactions to fail.
_mint(RESERVE_TREASURY_ADDRESS, amount.rayDiv(index));
emit Transfer(address(0), RESERVE_TREASURY_ADDRESS, amount);
emit Mint(RESERVE_TREASURY_ADDRESS, amount, index);
}
/**
* @dev Transfers xTokens in the event of a borrow being liquidated, in case the liquidators reclaims the xToken
* - Only callable by the MarginPool
* @param from The address getting liquidated, current owner of the xTokens
* @param to The recipient
* @param value The amount of tokens getting transferred
**/
function transferOnLiquidation(
address from,
address to,
uint256 value
) external override onlyMarginPool updateReward(from) updateReward(to) {
// 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);
}
/**
* @dev Calculates the balance of the user: principal balance + interest generated by the principal
* @param user The user whose balance is calculated
* @return The balance of the user
**/
function balanceOf(address user)
public
view
override(IncentivizedERC20, IERC20)
returns (uint256)
{
return
super.balanceOf(user).rayMul(
POOL.getReserveNormalizedIncome(UNDERLYING_ASSET_ADDRESS)
);
}
/**
* @dev Returns the scaled balance of the user. The scaled balance is the sum of all the
* updated stored balance divided by the reserve's liquidity index at the moment of the update
* @param user The user whose balance is calculated
* @return The scaled balance of the user
**/
function scaledBalanceOf(address user)
external
view
override
returns (uint256)
{
return super.balanceOf(user);
}
/**
* @dev Returns the scaled balance of the user and the scaled total supply.
* @param user The address of the user
* @return The scaled balance of the user
* @return The scaled balance and the scaled total supply
**/
function getScaledUserBalanceAndSupply(address user)
external
view
override
returns (uint256, uint256)
{
return (super.balanceOf(user), super.totalSupply());
}
/**
* @dev calculates the total supply of the specific xToken
* since the balance of every single user increases over time, the total supply
* does that too.
* @return the current total supply
**/
function totalSupply()
public
view
override(IncentivizedERC20, IERC20)
returns (uint256)
{
uint256 currentSupplyScaled = super.totalSupply();
if (currentSupplyScaled == 0) {
return 0;
}
return
currentSupplyScaled.rayMul(
POOL.getReserveNormalizedIncome(UNDERLYING_ASSET_ADDRESS)
);
}
/**
* @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
* @return the scaled total supply
**/
function scaledTotalSupply()
public
view
virtual
override
returns (uint256)
{
return super.totalSupply();
}
/**
* @dev Transfers the underlying asset to `target`. Used by the MarginPool to transfer
* assets in borrow(), withdraw()
* @param target The recipient of the xTokens
* @param amount The amount getting transferred
* @return The amount transferred
**/
function transferUnderlyingTo(address target, uint256 amount)
external
override
onlyMarginPool
returns (uint256)
{
IERC20(UNDERLYING_ASSET_ADDRESS).safeTransfer(target, amount);
return amount;
}
/**
* @dev implements the permit function as for
* https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
* @param owner The owner of the funds
* @param spender The spender
* @param value The amount
* @param deadline The deadline timestamp, type(uint256).max for max deadline
* @param v Signature param
* @param s Signature param
* @param r Signature param
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external {
require(owner != address(0), "INVALID_OWNER");
//solium-disable-next-line
require(block.timestamp <= deadline, "INVALID_EXPIRATION");
uint256 currentValidNonce = _nonces[owner];
bytes32 digest =
keccak256(
abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR,
keccak256(
abi.encode(
PERMIT_TYPEHASH,
owner,
spender,
value,
currentValidNonce,
deadline
)
)
)
);
require(owner == ecrecover(digest, v, r, s), "INVALID_SIGNATURE");
_nonces[owner] = currentValidNonce.add(1);
_approve(owner, spender, value);
}
/**
* @dev Transfers the xTokens between two users. Validates the transfer
* (ie checks for valid HF after the transfer) if required
* @param from The source address
* @param to The destination address
* @param amount The amount getting transferred
* @param validate `true` if the transfer needs to be validated
**/
function _transfer(
address from,
address to,
uint256 amount,
bool validate
) internal updateReward(from) updateReward(to) {
uint256 index =
POOL.getReserveNormalizedIncome(UNDERLYING_ASSET_ADDRESS);
uint256 fromBalanceBefore = super.balanceOf(from).rayMul(index);
uint256 toBalanceBefore = super.balanceOf(to).rayMul(index);
super._transfer(from, to, amount.rayDiv(index));
if (validate) {
POOL.finalizeTransfer(
UNDERLYING_ASSET_ADDRESS,
from,
to,
amount,
fromBalanceBefore,
toBalanceBefore
);
}
emit BalanceTransfer(from, to, amount, index);
}
/**
* @dev Overrides the parent _transfer to force validated transfer() and transferFrom()
* @param from The source address
* @param to The destination address
* @param amount The amount getting transferred
**/
function _transfer(
address from,
address to,
uint256 amount
) internal override {
_transfer(from, to, amount, true);
}
function lastTimeRewardApplicable() public view returns (uint256) {
return Math.min(block.timestamp, periodFinish);
}
function rewardPerToken() public view returns (uint256) {
if (totalSupply() == 0) {
return rewardPerTokenStored;
}
return
rewardPerTokenStored.add(
lastTimeRewardApplicable()
.sub(lastUpdateTime)
.mul(rewardRate)
.mul(1e18)
.div(totalSupply())
);
}
function earned(address account) public view returns (uint256) {
return
balanceOf(account)
.mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
.div(1e18)
.add(rewards[account]);
}
function getRewardForDuration() external view returns (uint256) {
return rewardRate.mul(rewardsDuration);
}
function getReward() public nonReentrant updateReward(msg.sender) {
uint256 reward = rewards[msg.sender];
require(reward > 0);
rewards[msg.sender] = 0;
rewardsToken.safeTransfer(msg.sender, reward);
emit RewardPaid(msg.sender, reward);
}
/* ========== RESTRICTED FUNCTIONS ========== */
function notifyRewardAmount(uint256 reward, uint256 _rewardsDuration)
external
onlyRewardsDistribution
updateReward(address(0))
{
// Ensure the provided reward amount is not more than the balance in the contract.
// This keeps the reward rate in the right range, preventing overflows due to
// very high values of rewardRate in the earned and rewardsPerToken functions;
// Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
uint256 balance = rewardsToken.balanceOf(address(this));
if (block.timestamp >= periodFinish) {
rewardsDuration = _rewardsDuration;
rewardRate = reward.div(rewardsDuration);
require(
rewardRate <= balance.div(rewardsDuration),
"Provided reward too high"
);
periodFinish = block.timestamp.add(rewardsDuration);
} else {
uint256 remaining = periodFinish.sub(block.timestamp);
uint256 leftover = remaining.mul(rewardRate);
rewardRate = reward.add(leftover).div(remaining);
require(
rewardRate <= balance.div(remaining),
"Provided reward too high"
);
}
lastUpdateTime = block.timestamp;
emit RewardAdded(reward, _rewardsDuration);
}
/* ========== EVENTS ========== */
event RewardAdded(uint256 reward, uint256 _rewardsDuration);
event RewardPaid(address indexed user, uint256 reward);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
import {MarginPoolConfigurator} from './MarginPoolConfigurator.sol';
import {XToken} from './XToken.sol';
import {
DefaultReserveInterestRateStrategy
} from './DefaultReserveInterestRateStrategy.sol';
import {Ownable} from './Ownable.sol';
import {StringLib} from './StringLib.sol';
contract XTokensAndRatesHelper is Ownable {
address payable private pool;
address private addressesProvider;
address private poolConfigurator;
event deployedContracts(address xToken, address strategy);
constructor(
address _addressesProvider,
address _poolConfigurator
) public {
addressesProvider = _addressesProvider;
poolConfigurator = _poolConfigurator;
}
function initDeployment(
address[] calldata assets,
string[] calldata symbols,
uint256[4][] calldata rates,
uint8[] calldata decimals
) external onlyOwner {
require(assets.length == symbols.length, 't Arrays not same length');
require(rates.length == symbols.length, 'r Arrays not same length');
for (uint256 i = 0; i < assets.length; i++) {
emit deployedContracts(
address(
new XToken(
addressesProvider,
assets[i],
StringLib.concat('Lever interest bearing ', symbols[i]),
StringLib.concat('x', symbols[i]),
decimals[i]
)
),
address(
new DefaultReserveInterestRateStrategy(
IMarginPoolAddressesProvider(addressesProvider),
rates[i][0],
rates[i][1],
rates[i][2],
rates[i][3]
)
)
);
}
}
function initReserve(
address[] calldata variables,
address[] calldata xTokens,
address[] calldata strategies,
uint8[] calldata reserveDecimals
) external onlyOwner {
require(xTokens.length == variables.length);
require(strategies.length == variables.length);
require(reserveDecimals.length == variables.length);
for (uint256 i = 0; i < variables.length; i++) {
MarginPoolConfigurator(poolConfigurator).initReserve(
xTokens[i],
variables[i],
reserveDecimals[i],
strategies[i]
);
}
}
function configureReserves(
address[] calldata assets,
uint256[] calldata baseLTVs,
uint256[] calldata liquidationThresholds,
uint256[] calldata liquidationBonuses,
uint256[] calldata reserveFactors
) external onlyOwner {
require(baseLTVs.length == assets.length);
require(liquidationThresholds.length == assets.length);
require(liquidationBonuses.length == assets.length);
require(reserveFactors.length == assets.length);
MarginPoolConfigurator configurator = MarginPoolConfigurator(poolConfigurator);
for (uint256 i = 0; i < assets.length; i++) {
configurator.configureReserveAsCollateral(
assets[i],
baseLTVs[i],
liquidationThresholds[i],
liquidationBonuses[i]
);
configurator.setReserveFactor(assets[i], reserveFactors[i]);
}
}
}