Contract Source Code:
File 1 of 1 : BDeployer
// File: contracts\libraries\SafeMath.sol
pragma solidity =0.5.16;
// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/Math.sol
// Subject to the MIT license.
/**
* @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 addition of two unsigned integers, reverting with custom message on overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, errorMessage);
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on underflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot underflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction underflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on underflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot underflow.
*/
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 multiplication of two unsigned integers, reverting on overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b, string memory errorMessage) 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, errorMessage);
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;
}
}
// File: contracts\ImpermaxERC20.sol
pragma solidity =0.5.16;
// This contract is basically UniswapV2ERC20 with small modifications
// src: https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol
contract ImpermaxERC20 {
using SafeMath for uint;
string public name;
string public symbol;
uint8 public decimals = 18;
uint public totalSupply;
mapping(address => uint) public balanceOf;
mapping(address => mapping(address => uint)) public allowance;
bytes32 public DOMAIN_SEPARATOR;
mapping(address => uint) public nonces;
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
constructor() public {}
function _setName(string memory _name, string memory _symbol) internal {
name = _name;
symbol = _symbol;
uint chainId;
assembly {
chainId := chainid
}
DOMAIN_SEPARATOR = keccak256(
abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(_name)),
keccak256(bytes("1")),
chainId,
address(this)
)
);
}
function _mint(address to, uint value) internal {
totalSupply = totalSupply.add(value);
balanceOf[to] = balanceOf[to].add(value);
emit Transfer(address(0), to, value);
}
function _burn(address from, uint value) internal {
balanceOf[from] = balanceOf[from].sub(value);
totalSupply = totalSupply.sub(value);
emit Transfer(from, address(0), value);
}
function _approve(address owner, address spender, uint value) private {
allowance[owner][spender] = value;
emit Approval(owner, spender, value);
}
function _transfer(address from, address to, uint value) internal {
balanceOf[from] = balanceOf[from].sub(value, "Impermax: TRANSFER_TOO_HIGH");
balanceOf[to] = balanceOf[to].add(value);
emit Transfer(from, to, value);
}
function approve(address spender, uint value) external returns (bool) {
_approve(msg.sender, spender, value);
return true;
}
function transfer(address to, uint value) external returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
function transferFrom(address from, address to, uint value) external returns (bool) {
if (allowance[from][msg.sender] != uint(-1)) {
allowance[from][msg.sender] = allowance[from][msg.sender].sub(value, "Impermax: TRANSFER_NOT_ALLOWED");
}
_transfer(from, to, value);
return true;
}
function _checkSignature(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s, bytes32 typehash) internal {
require(deadline >= block.timestamp, "Impermax: EXPIRED");
bytes32 digest = keccak256(
abi.encodePacked(
'\x19\x01',
DOMAIN_SEPARATOR,
keccak256(abi.encode(typehash, owner, spender, value, nonces[owner]++, deadline))
)
);
address recoveredAddress = ecrecover(digest, v, r, s);
require(recoveredAddress != address(0) && recoveredAddress == owner, "Impermax: INVALID_SIGNATURE");
}
// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
_checkSignature(owner, spender, value, deadline, v, r, s, PERMIT_TYPEHASH);
_approve(owner, spender, value);
}
}
// File: contracts\interfaces\IERC20.sol
pragma solidity >=0.5.0;
interface IERC20 {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
}
// File: contracts\interfaces\IPoolToken.sol
pragma solidity >=0.5.0;
interface IPoolToken {
/*** Impermax ERC20 ***/
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
/*** Pool Token ***/
event Mint(address indexed sender, address indexed minter, uint mintAmount, uint mintTokens);
event Redeem(address indexed sender, address indexed redeemer, uint redeemAmount, uint redeemTokens);
event Sync(uint totalBalance);
function underlying() external view returns (address);
function factory() external view returns (address);
function totalBalance() external view returns (uint);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function exchangeRate() external returns (uint);
function mint(address minter) external returns (uint mintTokens);
function redeem(address redeemer) external returns (uint redeemAmount);
function skim(address to) external;
function sync() external;
function _setFactory() external;
}
// File: contracts\PoolToken.sol
pragma solidity =0.5.16;
contract PoolToken is IPoolToken, ImpermaxERC20 {
uint internal constant initialExchangeRate = 1e18;
address public underlying;
address public factory;
uint public totalBalance;
uint public constant MINIMUM_LIQUIDITY = 1000;
event Mint(address indexed sender, address indexed minter, uint mintAmount, uint mintTokens);
event Redeem(address indexed sender, address indexed redeemer, uint redeemAmount, uint redeemTokens);
event Sync(uint totalBalance);
/*** Initialize ***/
// called once by the factory
function _setFactory() external {
require(factory == address(0), "Impermax: FACTORY_ALREADY_SET");
factory = msg.sender;
}
/*** PoolToken ***/
function _update() internal {
totalBalance = IERC20(underlying).balanceOf(address(this));
emit Sync(totalBalance);
}
function exchangeRate() public returns (uint)
{
uint _totalSupply = totalSupply; // gas savings
uint _totalBalance = totalBalance; // gas savings
if (_totalSupply == 0 || _totalBalance == 0) return initialExchangeRate;
return _totalBalance.mul(1e18).div(_totalSupply);
}
// this low-level function should be called from another contract
function mint(address minter) external nonReentrant update returns (uint mintTokens) {
uint balance = IERC20(underlying).balanceOf(address(this));
uint mintAmount = balance.sub(totalBalance);
mintTokens = mintAmount.mul(1e18).div(exchangeRate());
if(totalSupply == 0) {
// permanently lock the first MINIMUM_LIQUIDITY tokens
mintTokens = mintTokens.sub(MINIMUM_LIQUIDITY);
_mint(address(0), MINIMUM_LIQUIDITY);
}
require(mintTokens > 0, "Impermax: MINT_AMOUNT_ZERO");
_mint(minter, mintTokens);
emit Mint(msg.sender, minter, mintAmount, mintTokens);
}
// this low-level function should be called from another contract
function redeem(address redeemer) external nonReentrant update returns (uint redeemAmount) {
uint redeemTokens = balanceOf[address(this)];
redeemAmount = redeemTokens.mul(exchangeRate()).div(1e18);
require(redeemAmount > 0, "Impermax: REDEEM_AMOUNT_ZERO");
require(redeemAmount <= totalBalance, "Impermax: INSUFFICIENT_CASH");
_burn(address(this), redeemTokens);
_safeTransfer(redeemer, redeemAmount);
emit Redeem(msg.sender, redeemer, redeemAmount, redeemTokens);
}
// force real balance to match totalBalance
function skim(address to) external nonReentrant {
_safeTransfer(to, IERC20(underlying).balanceOf(address(this)).sub(totalBalance));
}
// force totalBalance to match real balance
function sync() external nonReentrant update {}
/*** Utilities ***/
// same safe transfer function used by UniSwapV2 (with fixed underlying)
bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
function _safeTransfer(address to, uint amount) internal {
(bool success, bytes memory data) = underlying.call(abi.encodeWithSelector(SELECTOR, to, amount));
require(success && (data.length == 0 || abi.decode(data, (bool))), "Impermax: TRANSFER_FAILED");
}
// prevents a contract from calling itself, directly or indirectly.
bool internal _notEntered = true;
modifier nonReentrant() {
require(_notEntered, "Impermax: REENTERED");
_notEntered = false;
_;
_notEntered = true;
}
// update totalBalance with current balance
modifier update() {
_;
_update();
}
}
// File: contracts\BStorage.sol
pragma solidity =0.5.16;
contract BStorage {
address public collateral;
mapping (address => mapping (address => uint256)) public borrowAllowance;
struct BorrowSnapshot {
uint112 principal; // amount in underlying when the borrow was last updated
uint112 interestIndex; // borrow index when borrow was last updated
}
mapping(address => BorrowSnapshot) internal borrowBalances;
// use one memory slot
uint112 public borrowIndex = 1e18;
uint112 public totalBorrows;
uint32 public accrualTimestamp = uint32(block.timestamp % 2**32);
uint public exchangeRateLast;
// use one memory slot
uint48 public borrowRate;
uint48 public kinkBorrowRate = 6.3419584e9; //20% per year
uint32 public rateUpdateTimestamp = uint32(block.timestamp % 2**32);
uint public reserveFactor = 0.10e18; //10%
uint public kinkUtilizationRate = 0.75e18; //75%
uint public adjustSpeed = 5.787037e12; //50% per day
address public borrowTracker;
function safe112(uint n) internal pure returns (uint112) {
require(n < 2**112, "Impermax: SAFE112");
return uint112(n);
}
}
// File: contracts\BAllowance.sol
pragma solidity =0.5.16;
contract BAllowance is PoolToken, BStorage {
event BorrowApproval(address indexed owner, address indexed spender, uint256 value);
function _borrowApprove(address owner, address spender, uint256 value) private {
borrowAllowance[owner][spender] = value;
emit BorrowApproval(owner, spender, value);
}
function borrowApprove(address spender, uint256 value) external returns (bool) {
_borrowApprove(msg.sender, spender, value);
return true;
}
function _checkBorrowAllowance(address owner, address spender, uint256 value) internal {
uint _borrowAllowance = borrowAllowance[owner][spender];
if (spender != owner && _borrowAllowance != uint256(-1)) {
require(_borrowAllowance >= value, "Impermax: BORROW_NOT_ALLOWED");
borrowAllowance[owner][spender] = _borrowAllowance - value;
}
}
// keccak256("BorrowPermit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
bytes32 public constant BORROW_PERMIT_TYPEHASH = 0xf6d86ed606f871fa1a557ac0ba607adce07767acf53f492fb215a1a4db4aea6f;
function borrowPermit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
_checkSignature(owner, spender, value, deadline, v, r, s, BORROW_PERMIT_TYPEHASH);
_borrowApprove(owner, spender, value);
}
}
// File: contracts\BInterestRateModel.sol
pragma solidity =0.5.16;
contract BInterestRateModel is PoolToken, BStorage {
// When utilization is 100% borrowRate is kinkBorrowRate * KINK_MULTIPLIER
// kinkBorrowRate relative adjustment per second belongs to [1-adjustSpeed, 1+adjustSpeed*(KINK_MULTIPLIER-1)]
uint public constant KINK_MULTIPLIER = 2;
uint public constant KINK_BORROW_RATE_MAX = 317.097920e9; //1000% per year
uint public constant KINK_BORROW_RATE_MIN = 0.31709792e9; //1% per year
event AccrueInterest(uint interestAccumulated, uint borrowIndex, uint totalBorrows);
event CalculateKinkBorrowRate(uint kinkBorrowRate);
event CalculateBorrowRate(uint borrowRate);
function _calculateBorrowRate() internal {
uint _kinkUtilizationRate = kinkUtilizationRate;
uint _adjustSpeed = adjustSpeed;
uint _borrowRate = borrowRate;
uint _kinkBorrowRate = kinkBorrowRate;
uint32 _rateUpdateTimestamp = rateUpdateTimestamp;
// update kinkBorrowRate using previous borrowRate
uint32 timeElapsed = getBlockTimestamp() - _rateUpdateTimestamp; // underflow is desired
if(timeElapsed > 0) {
rateUpdateTimestamp = getBlockTimestamp();
uint adjustFactor;
if (_borrowRate < _kinkBorrowRate) {
// never overflows, _kinkBorrowRate is never 0
uint tmp = (_kinkBorrowRate - _borrowRate) * 1e18 / _kinkBorrowRate * _adjustSpeed * timeElapsed / 1e18;
adjustFactor = tmp > 1e18 ? 0 : 1e18 - tmp;
} else {
// never overflows, _kinkBorrowRate is never 0
uint tmp = (_borrowRate - _kinkBorrowRate) * 1e18 / _kinkBorrowRate * _adjustSpeed * timeElapsed / 1e18;
adjustFactor = tmp + 1e18;
}
// never overflows
_kinkBorrowRate = _kinkBorrowRate * adjustFactor / 1e18;
if(_kinkBorrowRate > KINK_BORROW_RATE_MAX) _kinkBorrowRate = KINK_BORROW_RATE_MAX;
if(_kinkBorrowRate < KINK_BORROW_RATE_MIN) _kinkBorrowRate = KINK_BORROW_RATE_MIN;
kinkBorrowRate = uint48(_kinkBorrowRate);
emit CalculateKinkBorrowRate(_kinkBorrowRate);
}
uint _utilizationRate;
{ // avoid stack to deep
uint _totalBorrows = totalBorrows; // gas savings
uint _actualBalance = totalBalance.add(_totalBorrows);
_utilizationRate = (_actualBalance == 0) ? 0 : _totalBorrows * 1e18 / _actualBalance;
}
// update borrowRate using the new kinkBorrowRate
if(_utilizationRate <= _kinkUtilizationRate) {
// never overflows, _kinkUtilizationRate is never 0
_borrowRate = _kinkBorrowRate * _utilizationRate / _kinkUtilizationRate;
} else {
// never overflows, _kinkUtilizationRate is always < 1e18
uint overUtilization = (_utilizationRate - _kinkUtilizationRate) * 1e18 / (1e18 - _kinkUtilizationRate);
// never overflows
_borrowRate = ((KINK_MULTIPLIER - 1) * overUtilization + 1e18) * _kinkBorrowRate / 1e18;
}
borrowRate = uint48(_borrowRate);
emit CalculateBorrowRate(_borrowRate);
}
// applies accrued interest to total borrows and reserves
function accrueInterest() public {
uint _borrowIndex = borrowIndex;
uint _totalBorrows = totalBorrows;
uint32 _accrualTimestamp = accrualTimestamp;
uint32 blockTimestamp = getBlockTimestamp();
if (_accrualTimestamp == blockTimestamp) return;
uint32 timeElapsed = blockTimestamp - _accrualTimestamp; // underflow is desired
accrualTimestamp = blockTimestamp;
uint interestFactor = uint(borrowRate).mul(timeElapsed);
uint interestAccumulated = interestFactor.mul(_totalBorrows).div(1e18);
_totalBorrows = _totalBorrows.add( interestAccumulated );
_borrowIndex = _borrowIndex.add( interestFactor.mul(_borrowIndex).div(1e18) );
borrowIndex = safe112(_borrowIndex);
totalBorrows = safe112(_totalBorrows);
emit AccrueInterest(interestAccumulated, _borrowIndex, _totalBorrows);
}
function getBlockTimestamp() public view returns (uint32) {
return uint32(block.timestamp % 2**32);
}
}
// File: contracts\interfaces\IFactory.sol
pragma solidity >=0.5.0;
interface IFactory {
event LendingPoolInitialized(address indexed uniswapV2Pair, address indexed token0, address indexed token1,
address collateral, address borrowable0, address borrowable1, uint lendingPoolId);
event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);
event NewAdmin(address oldAdmin, address newAdmin);
event NewReservesPendingAdmin(address oldReservesPendingAdmin, address newReservesPendingAdmin);
event NewReservesAdmin(address oldReservesAdmin, address newReservesAdmin);
event NewReservesManager(address oldReservesManager, address newReservesManager);
function admin() external view returns (address);
function pendingAdmin() external view returns (address);
function reservesAdmin() external view returns (address);
function reservesPendingAdmin() external view returns (address);
function reservesManager() external view returns (address);
function getLendingPool(address uniswapV2Pair) external view returns (
bool initialized,
uint24 lendingPoolId,
address collateral,
address borrowable0,
address borrowable1
);
function allLendingPools(uint) external view returns (address uniswapV2Pair);
function allLendingPoolsLength() external view returns (uint);
function bDeployer() external view returns (address);
function cDeployer() external view returns (address);
function createCollateral(address uniswapV2Pair) external returns (address collateral);
function createBorrowable0(address uniswapV2Pair) external returns (address borrowable0);
function createBorrowable1(address uniswapV2Pair) external returns (address borrowable1);
function initializeLendingPool(address uniswapV2Pair) external;
function _setPendingAdmin(address newPendingAdmin) external;
function _acceptAdmin() external;
function _setReservesPendingAdmin(address newPendingAdmin) external;
function _acceptReservesAdmin() external;
function _setReservesManager(address newReservesManager) external;
}
// File: contracts\BSetter.sol
pragma solidity =0.5.16;
contract BSetter is PoolToken, BStorage {
uint public constant RESERVE_FACTOR_MAX = 0.20e18; //20%
uint public constant KINK_UR_MIN = 0.50e18; //50%
uint public constant KINK_UR_MAX = 0.99e18; //99%
uint public constant ADJUST_SPEED_MIN = 0.05787037e12; //0.5% per day
uint public constant ADJUST_SPEED_MAX = 57.87037e12; //500% per day
event NewReserveFactor(uint newReserveFactor);
event NewKinkUtilizationRate(uint newKinkUtilizationRate);
event NewAdjustSpeed(uint newAdjustSpeed);
event NewBorrowTracker(address newBorrowTracker);
// called once by the factory at time of deployment
function _initialize (
string calldata _name,
string calldata _symbol,
address _underlying,
address _collateral
) external {
require(msg.sender == factory, "Impermax: UNAUTHORIZED"); // sufficient check
_setName(_name, _symbol);
underlying = _underlying;
collateral = _collateral;
exchangeRateLast = initialExchangeRate;
}
function _setReserveFactor(uint newReserveFactor) external nonReentrant {
_checkSetting(newReserveFactor, 0, RESERVE_FACTOR_MAX);
reserveFactor = newReserveFactor;
emit NewReserveFactor(newReserveFactor);
}
function _setKinkUtilizationRate(uint newKinkUtilizationRate) external nonReentrant {
_checkSetting(newKinkUtilizationRate, KINK_UR_MIN, KINK_UR_MAX);
kinkUtilizationRate = newKinkUtilizationRate;
emit NewKinkUtilizationRate(newKinkUtilizationRate);
}
function _setAdjustSpeed(uint newAdjustSpeed) external nonReentrant {
_checkSetting(newAdjustSpeed, ADJUST_SPEED_MIN, ADJUST_SPEED_MAX);
adjustSpeed = newAdjustSpeed;
emit NewAdjustSpeed(newAdjustSpeed);
}
function _setBorrowTracker(address newBorrowTracker) external nonReentrant {
_checkAdmin();
borrowTracker = newBorrowTracker;
emit NewBorrowTracker(newBorrowTracker);
}
function _checkSetting(uint parameter, uint min, uint max) internal view {
_checkAdmin();
require(parameter >= min, "Impermax: INVALID_SETTING");
require(parameter <= max, "Impermax: INVALID_SETTING");
}
function _checkAdmin() internal view {
require(msg.sender == IFactory(factory).admin(), "Impermax: UNAUTHORIZED");
}
}
// File: contracts\interfaces\IBorrowable.sol
pragma solidity >=0.5.0;
interface IBorrowable {
/*** Impermax ERC20 ***/
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
/*** Pool Token ***/
event Mint(address indexed sender, address indexed minter, uint mintAmount, uint mintTokens);
event Redeem(address indexed sender, address indexed redeemer, uint redeemAmount, uint redeemTokens);
event Sync(uint totalBalance);
function underlying() external view returns (address);
function factory() external view returns (address);
function totalBalance() external view returns (uint);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function exchangeRate() external returns (uint);
function mint(address minter) external returns (uint mintTokens);
function redeem(address redeemer) external returns (uint redeemAmount);
function skim(address to) external;
function sync() external;
function _setFactory() external;
/*** Borrowable ***/
event BorrowApproval(address indexed owner, address indexed spender, uint value);
event Borrow(address indexed sender, address indexed borrower, address indexed receiver, uint borrowAmount, uint repayAmount, uint accountBorrowsPrior, uint accountBorrows, uint totalBorrows);
event Liquidate(address indexed sender, address indexed borrower, address indexed liquidator, uint seizeTokens, uint repayAmount, uint accountBorrowsPrior, uint accountBorrows, uint totalBorrows);
function BORROW_FEE() external pure returns (uint);
function collateral() external view returns (address);
function reserveFactor() external view returns (uint);
function exchangeRateLast() external view returns (uint);
function borrowIndex() external view returns (uint);
function totalBorrows() external view returns (uint);
function borrowAllowance(address owner, address spender) external view returns (uint);
function borrowBalance(address borrower) external view returns (uint);
function borrowTracker() external view returns (address);
function BORROW_PERMIT_TYPEHASH() external pure returns (bytes32);
function borrowApprove(address spender, uint256 value) external returns (bool);
function borrowPermit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
function borrow(address borrower, address receiver, uint borrowAmount, bytes calldata data) external;
function liquidate(address borrower, address liquidator) external returns (uint seizeTokens);
function trackBorrow(address borrower) external;
/*** Borrowable Interest Rate Model ***/
event AccrueInterest(uint interestAccumulated, uint borrowIndex, uint totalBorrows);
event CalculateKink(uint kinkRate);
event CalculateBorrowRate(uint borrowRate);
function KINK_BORROW_RATE_MAX() external pure returns (uint);
function KINK_BORROW_RATE_MIN() external pure returns (uint);
function KINK_MULTIPLIER() external pure returns (uint);
function borrowRate() external view returns (uint);
function kinkBorrowRate() external view returns (uint);
function kinkUtilizationRate() external view returns (uint);
function adjustSpeed() external view returns (uint);
function rateUpdateTimestamp() external view returns (uint32);
function accrualTimestamp() external view returns (uint32);
function accrueInterest() external;
/*** Borrowable Setter ***/
event NewReserveFactor(uint newReserveFactor);
event NewKinkUtilizationRate(uint newKinkUtilizationRate);
event NewAdjustSpeed(uint newAdjustSpeed);
event NewBorrowTracker(address newBorrowTracker);
function RESERVE_FACTOR_MAX() external pure returns (uint);
function KINK_UR_MIN() external pure returns (uint);
function KINK_UR_MAX() external pure returns (uint);
function ADJUST_SPEED_MIN() external pure returns (uint);
function ADJUST_SPEED_MAX() external pure returns (uint);
function _initialize (
string calldata _name,
string calldata _symbol,
address _underlying,
address _collateral
) external;
function _setReserveFactor(uint newReserveFactor) external;
function _setKinkUtilizationRate(uint newKinkUtilizationRate) external;
function _setAdjustSpeed(uint newAdjustSpeed) external;
function _setBorrowTracker(address newBorrowTracker) external;
}
// File: contracts\interfaces\ICollateral.sol
pragma solidity >=0.5.0;
interface ICollateral {
/*** Impermax ERC20 ***/
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
/*** Pool Token ***/
event Mint(address indexed sender, address indexed minter, uint mintAmount, uint mintTokens);
event Redeem(address indexed sender, address indexed redeemer, uint redeemAmount, uint redeemTokens);
event Sync(uint totalBalance);
function underlying() external view returns (address);
function factory() external view returns (address);
function totalBalance() external view returns (uint);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function exchangeRate() external returns (uint);
function mint(address minter) external returns (uint mintTokens);
function redeem(address redeemer) external returns (uint redeemAmount);
function skim(address to) external;
function sync() external;
function _setFactory() external;
/*** Collateral ***/
function borrowable0() external view returns (address);
function borrowable1() external view returns (address);
function safetyMarginSqrt() external view returns (uint);
function liquidationIncentive() external view returns (uint);
function getPrices() external returns (uint price0, uint price1);
function tokensUnlocked(address from, uint value) external returns (bool);
function accountLiquidityAmounts(address account, uint amount0, uint amount1) external returns (uint liquidity, uint shortfall);
function accountLiquidity(address account) external returns (uint liquidity, uint shortfall);
function canBorrow(address account, address borrowable, uint accountBorrows) external returns (bool);
function seize(address liquidator, address borrower, uint repayAmount) external returns (uint seizeTokens);
function flashRedeem(address redeemer, uint redeemAmount, bytes calldata data) external;
/*** Collateral Setter ***/
event NewSafetyMargin(uint newSafetyMarginSqrt);
event NewLiquidationIncentive(uint newLiquidationIncentive);
function SAFETY_MARGIN_SQRT_MIN() external pure returns (uint);
function SAFETY_MARGIN_SQRT_MAX() external pure returns (uint);
function LIQUIDATION_INCENTIVE_MIN() external pure returns (uint);
function LIQUIDATION_INCENTIVE_MAX() external pure returns (uint);
function _initialize (
string calldata _name,
string calldata _symbol,
address _underlying,
address _borrowable0,
address _borrowable1
) external;
function _setSafetyMarginSqrt(uint newSafetyMarginSqrt) external;
function _setLiquidationIncentive(uint newLiquidationIncentive) external;
}
// File: contracts\interfaces\IImpermaxCallee.sol
pragma solidity >=0.5.0;
interface IImpermaxCallee {
function impermaxBorrow(address sender, address borrower, uint borrowAmount, bytes calldata data) external;
function impermaxRedeem(address sender, uint redeemAmount, bytes calldata data) external;
}
// File: contracts\interfaces\IBorrowTracker.sol
pragma solidity >=0.5.0;
interface IBorrowTracker {
function trackBorrow(address borrower, uint borrowBalance, uint borrowIndex) external;
}
// File: contracts\libraries\Math.sol
pragma solidity =0.5.16;
// a library for performing various math operations
// forked from: https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/libraries/Math.sol
library Math {
function min(uint x, uint y) internal pure returns (uint z) {
z = x < y ? x : y;
}
// babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
function sqrt(uint y) internal pure returns (uint z) {
if (y > 3) {
z = y;
uint x = y / 2 + 1;
while (x < z) {
z = x;
x = (y / x + x) / 2;
}
} else if (y != 0) {
z = 1;
}
}
}
// File: contracts\Borrowable.sol
pragma solidity =0.5.16;
contract Borrowable is IBorrowable, PoolToken, BStorage, BSetter, BInterestRateModel, BAllowance {
uint public constant BORROW_FEE = 0;
event Borrow(address indexed sender, address indexed borrower, address indexed receiver, uint borrowAmount, uint repayAmount, uint accountBorrowsPrior, uint accountBorrows, uint totalBorrows);
event Liquidate(address indexed sender, address indexed borrower, address indexed liquidator, uint seizeTokens, uint repayAmount, uint accountBorrowsPrior, uint accountBorrows, uint totalBorrows);
constructor() public {}
/*** PoolToken ***/
function _update() internal {
super._update();
_calculateBorrowRate();
}
function _mintReserves(uint _exchangeRate, uint _totalSupply) internal returns (uint) {
uint _exchangeRateLast = exchangeRateLast;
if (_exchangeRate > _exchangeRateLast) {
uint _exchangeRateNew = _exchangeRate.sub( _exchangeRate.sub(_exchangeRateLast).mul(reserveFactor).div(1e18) );
uint liquidity = _totalSupply.mul(_exchangeRate).div(_exchangeRateNew).sub(_totalSupply);
if (liquidity > 0) {
address reservesManager = IFactory(factory).reservesManager();
_mint(reservesManager, liquidity);
}
exchangeRateLast = _exchangeRateNew;
return _exchangeRateNew;
}
else return _exchangeRate;
}
function exchangeRate() public accrue returns (uint) {
uint _totalSupply = totalSupply;
uint _actualBalance = totalBalance.add(totalBorrows);
if (_totalSupply == 0 || _actualBalance == 0) return initialExchangeRate;
uint _exchangeRate = _actualBalance.mul(1e18).div(_totalSupply);
return _mintReserves(_exchangeRate, _totalSupply);
}
// force totalBalance to match real balance
function sync() external nonReentrant update accrue {}
/*** Borrowable ***/
// this is the stored borrow balance; the current borrow balance may be slightly higher
function borrowBalance(address borrower) public view returns (uint) {
BorrowSnapshot memory borrowSnapshot = borrowBalances[borrower];
if (borrowSnapshot.interestIndex == 0) return 0; // not initialized
return uint(borrowSnapshot.principal).mul(borrowIndex).div(borrowSnapshot.interestIndex);
}
function _trackBorrow(address borrower, uint accountBorrows, uint _borrowIndex) internal {
address _borrowTracker = borrowTracker;
if (_borrowTracker == address(0)) return;
IBorrowTracker(_borrowTracker).trackBorrow(borrower, accountBorrows, _borrowIndex);
}
function _updateBorrow(address borrower, uint borrowAmount, uint repayAmount) private returns (uint accountBorrowsPrior, uint accountBorrows, uint _totalBorrows) {
accountBorrowsPrior = borrowBalance(borrower);
if (borrowAmount == repayAmount) return (accountBorrowsPrior, accountBorrowsPrior, totalBorrows);
uint112 _borrowIndex = borrowIndex;
if (borrowAmount > repayAmount) {
BorrowSnapshot storage borrowSnapshot = borrowBalances[borrower];
uint increaseAmount = borrowAmount - repayAmount;
accountBorrows = accountBorrowsPrior.add(increaseAmount);
borrowSnapshot.principal = safe112(accountBorrows);
borrowSnapshot.interestIndex = _borrowIndex;
_totalBorrows = uint(totalBorrows).add(increaseAmount);
totalBorrows = safe112(_totalBorrows);
}
else {
BorrowSnapshot storage borrowSnapshot = borrowBalances[borrower];
uint decreaseAmount = repayAmount - borrowAmount;
accountBorrows = accountBorrowsPrior > decreaseAmount ? accountBorrowsPrior - decreaseAmount : 0;
borrowSnapshot.principal = safe112(accountBorrows);
if(accountBorrows == 0) {
borrowSnapshot.interestIndex = 0;
} else {
borrowSnapshot.interestIndex = _borrowIndex;
}
uint actualDecreaseAmount = accountBorrowsPrior.sub(accountBorrows);
_totalBorrows = totalBorrows; // gas savings
_totalBorrows = _totalBorrows > actualDecreaseAmount ? _totalBorrows - actualDecreaseAmount : 0;
totalBorrows = safe112(_totalBorrows);
}
_trackBorrow(borrower, accountBorrows, _borrowIndex);
}
// this low-level function should be called from another contract
function borrow(address borrower, address receiver, uint borrowAmount, bytes calldata data) external nonReentrant update accrue {
uint _totalBalance = totalBalance;
require(borrowAmount <= _totalBalance, "Impermax: INSUFFICIENT_CASH");
_checkBorrowAllowance(borrower, msg.sender, borrowAmount);
// optimistically transfer funds
if (borrowAmount > 0) _safeTransfer(receiver, borrowAmount);
if (data.length > 0) IImpermaxCallee(receiver).impermaxBorrow(msg.sender, borrower, borrowAmount, data);
uint balance = IERC20(underlying).balanceOf(address(this));
uint borrowFee = borrowAmount.mul(BORROW_FEE).div(1e18);
uint adjustedBorrowAmount = borrowAmount.add(borrowFee);
uint repayAmount = balance.add(borrowAmount).sub(_totalBalance);
(uint accountBorrowsPrior, uint accountBorrows, uint _totalBorrows) = _updateBorrow(borrower, adjustedBorrowAmount, repayAmount);
if(adjustedBorrowAmount > repayAmount) require(
ICollateral(collateral).canBorrow(borrower, address(this), accountBorrows),
"Impermax: INSUFFICIENT_LIQUIDITY"
);
emit Borrow(msg.sender, borrower, receiver, borrowAmount, repayAmount, accountBorrowsPrior, accountBorrows, _totalBorrows);
}
// this low-level function should be called from another contract
function liquidate(address borrower, address liquidator) external nonReentrant update accrue returns (uint seizeTokens) {
uint balance = IERC20(underlying).balanceOf(address(this));
uint repayAmount = balance.sub(totalBalance);
uint actualRepayAmount = Math.min(borrowBalance(borrower), repayAmount);
seizeTokens = ICollateral(collateral).seize(liquidator, borrower, actualRepayAmount);
(uint accountBorrowsPrior, uint accountBorrows, uint _totalBorrows) = _updateBorrow(borrower, 0, repayAmount);
emit Liquidate(msg.sender, borrower, liquidator, seizeTokens, repayAmount, accountBorrowsPrior, accountBorrows, _totalBorrows);
}
function trackBorrow(address borrower) external {
_trackBorrow(borrower, borrowBalance(borrower), borrowIndex);
}
modifier accrue() {
accrueInterest();
_;
}
}
// File: contracts\interfaces\IBDeployer.sol
pragma solidity >=0.5.0;
interface IBDeployer {
function deployBorrowable(address uniswapV2Pair, uint8 index) external returns (address borrowable);
}
// File: contracts\BDeployer.sol
pragma solidity =0.5.16;
/*
* This contract is used by the Factory to deploy Borrowable(s)
* The bytecode would be too long to fit in the Factory
*/
contract BDeployer is IBDeployer {
constructor () public {}
function deployBorrowable(address uniswapV2Pair, uint8 index) external returns (address borrowable) {
bytes memory bytecode = type(Borrowable).creationCode;
bytes32 salt = keccak256(abi.encodePacked(msg.sender, uniswapV2Pair, index));
assembly {
borrowable := create2(0, add(bytecode, 32), mload(bytecode), salt)
}
}
}