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Private Name Tags
ContractCreator
Latest 25 from a total of 3,775 transactions
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| Deposit | 20452883 | 153 days ago | IN | 0 ETH | 0.00020636 | ||||
| Withdraw | 14422827 | 1020 days ago | IN | 0 ETH | 0.00256101 | ||||
| Withdraw | 14300284 | 1039 days ago | IN | 0 ETH | 0.00898921 | ||||
| Withdraw | 13308688 | 1194 days ago | IN | 0 ETH | 0.01089523 | ||||
| Withdraw | 13291676 | 1197 days ago | IN | 0 ETH | 0.00813474 | ||||
| Withdraw | 13275684 | 1199 days ago | IN | 0 ETH | 0.00751046 | ||||
| Withdraw | 13274732 | 1199 days ago | IN | 0 ETH | 0.00851364 | ||||
| Withdraw | 13273743 | 1200 days ago | IN | 0 ETH | 0.00807814 | ||||
| Withdraw | 13273592 | 1200 days ago | IN | 0 ETH | 0.00832392 | ||||
| Withdraw | 13273493 | 1200 days ago | IN | 0 ETH | 0.01225424 | ||||
| Withdraw | 13273361 | 1200 days ago | IN | 0 ETH | 0.01153431 | ||||
| Claim | 13223829 | 1207 days ago | IN | 0 ETH | 0.00527398 | ||||
| Withdraw | 13176357 | 1215 days ago | IN | 0 ETH | 0.01479308 | ||||
| Withdraw | 13173018 | 1215 days ago | IN | 0 ETH | 0.01777096 | ||||
| Withdraw | 13169814 | 1216 days ago | IN | 0 ETH | 0.01705448 | ||||
| Withdraw | 13162320 | 1217 days ago | IN | 0 ETH | 0.01956109 | ||||
| Claim | 13162119 | 1217 days ago | IN | 0 ETH | 0.0134961 | ||||
| Withdraw | 13156398 | 1218 days ago | IN | 0 ETH | 0.02621902 | ||||
| Claim | 13120022 | 1223 days ago | IN | 0 ETH | 0.00656936 | ||||
| Withdraw | 13117433 | 1224 days ago | IN | 0 ETH | 0.06011406 | ||||
| Claim | 13117370 | 1224 days ago | IN | 0 ETH | 0.01301678 | ||||
| Withdraw | 13114667 | 1224 days ago | IN | 0 ETH | 0.01010811 | ||||
| Claim | 13114647 | 1224 days ago | IN | 0 ETH | 0.01090665 | ||||
| Withdraw | 13082872 | 1229 days ago | IN | 0 ETH | 0.0102425 | ||||
| Withdraw | 13082830 | 1229 days ago | IN | 0 ETH | 0.0100981 |
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Contract Name:
StakingDFL
Compiler Version
v0.5.17+commit.d19bba13
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2020-11-20
*/
// File: contracts\EIP20Interface.sol
pragma solidity ^0.5.8;
/**
* @title ERC 20 Token Standard Interface
* https://eips.ethereum.org/EIPS/eip-20
*/
interface EIP20Interface {
/**
* @notice Get the total number of tokens in circulation
* @return The supply of tokens
*/
function totalSupply() external view returns (uint256);
/**
* @notice Gets the balance of the specified address
* @param owner The address from which the balance will be retrieved
* @return The balance
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @notice Transfer `amount` tokens from `msg.sender` to `dst`
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transfer(address dst, uint256 amount) external returns (bool success);
/**
* @notice Transfer `amount` tokens from `src` to `dst`
* @param src The address of the source account
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transferFrom(address src, address dst, uint256 amount) external returns (bool success);
/**
* @notice Approve `spender` to transfer up to `amount` from `src`
* @dev This will overwrite the approval amount for `spender`
* and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
* @param spender The address of the account which may transfer tokens
* @param amount The number of tokens that are approved (-1 means infinite)
* @return Whether or not the approval succeeded
*/
function approve(address spender, uint256 amount) external returns (bool success);
/**
* @notice Get the current allowance from `owner` for `spender`
* @param owner The address of the account which owns the tokens to be spent
* @param spender The address of the account which may transfer tokens
* @return The number of tokens allowed to be spent (-1 means infinite)
*/
function allowance(address owner, address spender) external view returns (uint256 remaining);
event Transfer(address indexed from, address indexed to, uint256 amount);
event Approval(address indexed owner, address indexed spender, uint256 amount);
}
// File: contracts\EIP20NonStandardInterface.sol
pragma solidity ^0.5.8;
/**
* @title EIP20NonStandardInterface
* @dev Version of ERC20 with no return values for `transfer` and `transferFrom`
* See https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
*/
interface EIP20NonStandardInterface {
/**
* @notice Get the total number of tokens in circulation
* @return The supply of tokens
*/
function totalSupply() external view returns (uint256);
/**
* @notice Gets the balance of the specified address
* @param owner The address from which the balance will be retrieved
* @return The balance
*/
function balanceOf(address owner) external view returns (uint256 balance);
///
/// !!!!!!!!!!!!!!
/// !!! NOTICE !!! `transfer` does not return a value, in violation of the ERC-20 specification
/// !!!!!!!!!!!!!!
///
/**
* @notice Transfer `amount` tokens from `msg.sender` to `dst`
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
*/
function transfer(address dst, uint256 amount) external;
///
/// !!!!!!!!!!!!!!
/// !!! NOTICE !!! `transferFrom` does not return a value, in violation of the ERC-20 specification
/// !!!!!!!!!!!!!!
///
/**
* @notice Transfer `amount` tokens from `src` to `dst`
* @param src The address of the source account
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
*/
function transferFrom(address src, address dst, uint256 amount) external;
/**
* @notice Approve `spender` to transfer up to `amount` from `src`
* @dev This will overwrite the approval amount for `spender`
* and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
* @param spender The address of the account which may transfer tokens
* @param amount The number of tokens that are approved
* @return Whether or not the approval succeeded
*/
function approve(address spender, uint256 amount) external returns (bool success);
/**
* @notice Get the current allowance from `owner` for `spender`
* @param owner The address of the account which owns the tokens to be spent
* @param spender The address of the account which may transfer tokens
* @return The number of tokens allowed to be spent
*/
function allowance(address owner, address spender) external view returns (uint256 remaining);
event Transfer(address indexed from, address indexed to, uint256 amount);
event Approval(address indexed owner, address indexed spender, uint256 amount);
}
// File: contracts\CarefulMath.sol
// File: contracts/CarefulMath.sol
pragma solidity ^0.5.8;
/**
* @title Careful Math
* @author Compound
* @notice Derived from OpenZeppelin's SafeMath library
* https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/math/SafeMath.sol
*/
contract CarefulMath {
/**
* @dev Possible error codes that we can return
*/
enum MathError {
NO_ERROR,
DIVISION_BY_ZERO,
INTEGER_OVERFLOW,
INTEGER_UNDERFLOW
}
/**
* @dev Multiplies two numbers, returns an error on overflow.
*/
function mulUInt(uint a, uint b) internal pure returns (MathError, uint) {
if (a == 0) {
return (MathError.NO_ERROR, 0);
}
uint c = a * b;
if (c / a != b) {
return (MathError.INTEGER_OVERFLOW, 0);
} else {
return (MathError.NO_ERROR, c);
}
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function divUInt(uint a, uint b) internal pure returns (MathError, uint) {
if (b == 0) {
return (MathError.DIVISION_BY_ZERO, 0);
}
return (MathError.NO_ERROR, a / b);
}
/**
* @dev Subtracts two numbers, returns an error on overflow (i.e. if subtrahend is greater than minuend).
*/
function subUInt(uint a, uint b) internal pure returns (MathError, uint) {
if (b <= a) {
return (MathError.NO_ERROR, a - b);
} else {
return (MathError.INTEGER_UNDERFLOW, 0);
}
}
/**
* @dev Adds two numbers, returns an error on overflow.
*/
function addUInt(uint a, uint b) internal pure returns (MathError, uint) {
uint c = a + b;
if (c >= a) {
return (MathError.NO_ERROR, c);
} else {
return (MathError.INTEGER_OVERFLOW, 0);
}
}
/**
* @dev add a and b and then subtract c
*/
function addThenSubUInt(uint a, uint b, uint c) internal pure returns (MathError, uint) {
(MathError err0, uint sum) = addUInt(a, b);
if (err0 != MathError.NO_ERROR) {
return (err0, 0);
}
return subUInt(sum, c);
}
}
// File: contracts\Exponential.sol
pragma solidity ^0.5.16;
/**
* @title Exponential module for storing fixed-precision decimals
* @author Compound
* @notice Exp is a struct which stores decimals with a fixed precision of 18 decimal places.
* Thus, if we wanted to store the 5.1, mantissa would store 5.1e18. That is:
* `Exp({mantissa: 5100000000000000000})`.
*/
contract Exponential is CarefulMath {
uint constant expScale = 1e18;
uint constant doubleScale = 1e36;
uint constant halfExpScale = expScale/2;
uint constant mantissaOne = expScale;
struct Exp {
uint mantissa;
}
struct Double {
uint mantissa;
}
/**
* @dev Creates an exponential from numerator and denominator values.
* Note: Returns an error if (`num` * 10e18) > MAX_INT,
* or if `denom` is zero.
*/
function getExp(uint num, uint denom) pure internal returns (MathError, Exp memory) {
(MathError err0, uint scaledNumerator) = mulUInt(num, expScale);
if (err0 != MathError.NO_ERROR) {
return (err0, Exp({mantissa: 0}));
}
(MathError err1, uint rational) = divUInt(scaledNumerator, denom);
if (err1 != MathError.NO_ERROR) {
return (err1, Exp({mantissa: 0}));
}
return (MathError.NO_ERROR, Exp({mantissa: rational}));
}
/**
* @dev Adds two exponentials, returning a new exponential.
*/
function addExp(Exp memory a, Exp memory b) pure internal returns (MathError, Exp memory) {
(MathError error, uint result) = addUInt(a.mantissa, b.mantissa);
return (error, Exp({mantissa: result}));
}
/**
* @dev Subtracts two exponentials, returning a new exponential.
*/
function subExp(Exp memory a, Exp memory b) pure internal returns (MathError, Exp memory) {
(MathError error, uint result) = subUInt(a.mantissa, b.mantissa);
return (error, Exp({mantissa: result}));
}
/**
* @dev Multiply an Exp by a scalar, returning a new Exp.
*/
function mulScalar(Exp memory a, uint scalar) pure internal returns (MathError, Exp memory) {
(MathError err0, uint scaledMantissa) = mulUInt(a.mantissa, scalar);
if (err0 != MathError.NO_ERROR) {
return (err0, Exp({mantissa: 0}));
}
return (MathError.NO_ERROR, Exp({mantissa: scaledMantissa}));
}
/**
* @dev Multiply an Exp by a scalar, then truncate to return an unsigned integer.
*/
function mulScalarTruncate(Exp memory a, uint scalar) pure internal returns (MathError, uint) {
(MathError err, Exp memory product) = mulScalar(a, scalar);
if (err != MathError.NO_ERROR) {
return (err, 0);
}
return (MathError.NO_ERROR, truncate(product));
}
/**
* @dev Multiply an Exp by a scalar, truncate, then add an to an unsigned integer, returning an unsigned integer.
*/
function mulScalarTruncateAddUInt(Exp memory a, uint scalar, uint addend) pure internal returns (MathError, uint) {
(MathError err, Exp memory product) = mulScalar(a, scalar);
if (err != MathError.NO_ERROR) {
return (err, 0);
}
return addUInt(truncate(product), addend);
}
/**
* @dev Divide an Exp by a scalar, returning a new Exp.
*/
function divScalar(Exp memory a, uint scalar) pure internal returns (MathError, Exp memory) {
(MathError err0, uint descaledMantissa) = divUInt(a.mantissa, scalar);
if (err0 != MathError.NO_ERROR) {
return (err0, Exp({mantissa: 0}));
}
return (MathError.NO_ERROR, Exp({mantissa: descaledMantissa}));
}
/**
* @dev Divide a scalar by an Exp, returning a new Exp.
*/
function divScalarByExp(uint scalar, Exp memory divisor) pure internal returns (MathError, Exp memory) {
/*
We are doing this as:
getExp(mulUInt(expScale, scalar), divisor.mantissa)
How it works:
Exp = a / b;
Scalar = s;
`s / (a / b)` = `b * s / a` and since for an Exp `a = mantissa, b = expScale`
*/
(MathError err0, uint numerator) = mulUInt(expScale, scalar);
if (err0 != MathError.NO_ERROR) {
return (err0, Exp({mantissa: 0}));
}
return getExp(numerator, divisor.mantissa);
}
/**
* @dev Divide a scalar by an Exp, then truncate to return an unsigned integer.
*/
function divScalarByExpTruncate(uint scalar, Exp memory divisor) pure internal returns (MathError, uint) {
(MathError err, Exp memory fraction) = divScalarByExp(scalar, divisor);
if (err != MathError.NO_ERROR) {
return (err, 0);
}
return (MathError.NO_ERROR, truncate(fraction));
}
/**
* @dev Multiplies two exponentials, returning a new exponential.
*/
function mulExp(Exp memory a, Exp memory b) pure internal returns (MathError, Exp memory) {
(MathError err0, uint doubleScaledProduct) = mulUInt(a.mantissa, b.mantissa);
if (err0 != MathError.NO_ERROR) {
return (err0, Exp({mantissa: 0}));
}
// We add half the scale before dividing so that we get rounding instead of truncation.
// See "Listing 6" and text above it at https://accu.org/index.php/journals/1717
// Without this change, a result like 6.6...e-19 will be truncated to 0 instead of being rounded to 1e-18.
(MathError err1, uint doubleScaledProductWithHalfScale) = addUInt(halfExpScale, doubleScaledProduct);
if (err1 != MathError.NO_ERROR) {
return (err1, Exp({mantissa: 0}));
}
(MathError err2, uint product) = divUInt(doubleScaledProductWithHalfScale, expScale);
// The only error `div` can return is MathError.DIVISION_BY_ZERO but we control `expScale` and it is not zero.
assert(err2 == MathError.NO_ERROR);
return (MathError.NO_ERROR, Exp({mantissa: product}));
}
/**
* @dev Multiplies two exponentials given their mantissas, returning a new exponential.
*/
function mulExp(uint a, uint b) pure internal returns (MathError, Exp memory) {
return mulExp(Exp({mantissa: a}), Exp({mantissa: b}));
}
/**
* @dev Multiplies three exponentials, returning a new exponential.
*/
function mulExp3(Exp memory a, Exp memory b, Exp memory c) pure internal returns (MathError, Exp memory) {
(MathError err, Exp memory ab) = mulExp(a, b);
if (err != MathError.NO_ERROR) {
return (err, ab);
}
return mulExp(ab, c);
}
/**
* @dev Divides two exponentials, returning a new exponential.
* (a/scale) / (b/scale) = (a/scale) * (scale/b) = a/b,
* which we can scale as an Exp by calling getExp(a.mantissa, b.mantissa)
*/
function divExp(Exp memory a, Exp memory b) pure internal returns (MathError, Exp memory) {
return getExp(a.mantissa, b.mantissa);
}
/**
* @dev Truncates the given exp to a whole number value.
* For example, truncate(Exp{mantissa: 15 * expScale}) = 15
*/
function truncate(Exp memory exp) pure internal returns (uint) {
// Note: We are not using careful math here as we're performing a division that cannot fail
return exp.mantissa / expScale;
}
/**
* @dev Checks if first Exp is less than second Exp.
*/
function lessThanExp(Exp memory left, Exp memory right) pure internal returns (bool) {
return left.mantissa < right.mantissa;
}
/**
* @dev Checks if left Exp <= right Exp.
*/
function lessThanOrEqualExp(Exp memory left, Exp memory right) pure internal returns (bool) {
return left.mantissa <= right.mantissa;
}
/**
* @dev Checks if left Exp > right Exp.
*/
function greaterThanExp(Exp memory left, Exp memory right) pure internal returns (bool) {
return left.mantissa > right.mantissa;
}
/**
* @dev returns true if Exp is exactly zero
*/
function isZeroExp(Exp memory value) pure internal returns (bool) {
return value.mantissa == 0;
}
function safe224(uint n, string memory errorMessage) pure internal returns (uint224) {
require(n < 2**224, errorMessage);
return uint224(n);
}
function safe32(uint n, string memory errorMessage) pure internal returns (uint32) {
require(n < 2**32, errorMessage);
return uint32(n);
}
function add_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
return Exp({mantissa: add_(a.mantissa, b.mantissa)});
}
function add_(Double memory a, Double memory b) pure internal returns (Double memory) {
return Double({mantissa: add_(a.mantissa, b.mantissa)});
}
function add_(uint a, uint b) pure internal returns (uint) {
return add_(a, b, "addition overflow");
}
function add_(uint a, uint b, string memory errorMessage) pure internal returns (uint) {
uint c = a + b;
require(c >= a, errorMessage);
return c;
}
function sub_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
return Exp({mantissa: sub_(a.mantissa, b.mantissa)});
}
function sub_(Double memory a, Double memory b) pure internal returns (Double memory) {
return Double({mantissa: sub_(a.mantissa, b.mantissa)});
}
function sub_(uint a, uint b) pure internal returns (uint) {
return sub_(a, b, "subtraction underflow");
}
function sub_(uint a, uint b, string memory errorMessage) pure internal returns (uint) {
require(b <= a, errorMessage);
return a - b;
}
function mul_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
return Exp({mantissa: mul_(a.mantissa, b.mantissa) / expScale});
}
function mul_(Exp memory a, uint b) pure internal returns (Exp memory) {
return Exp({mantissa: mul_(a.mantissa, b)});
}
function mul_(uint a, Exp memory b) pure internal returns (uint) {
return mul_(a, b.mantissa) / expScale;
}
function mul_(Double memory a, Double memory b) pure internal returns (Double memory) {
return Double({mantissa: mul_(a.mantissa, b.mantissa) / doubleScale});
}
function mul_(Double memory a, uint b) pure internal returns (Double memory) {
return Double({mantissa: mul_(a.mantissa, b)});
}
function mul_(uint a, Double memory b) pure internal returns (uint) {
return mul_(a, b.mantissa) / doubleScale;
}
function mul_(uint a, uint b) pure internal returns (uint) {
return mul_(a, b, "multiplication overflow");
}
function mul_(uint a, uint b, string memory errorMessage) pure internal returns (uint) {
if (a == 0 || b == 0) {
return 0;
}
uint c = a * b;
require(c / a == b, errorMessage);
return c;
}
function div_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
return Exp({mantissa: div_(mul_(a.mantissa, expScale), b.mantissa)});
}
function div_(Exp memory a, uint b) pure internal returns (Exp memory) {
return Exp({mantissa: div_(a.mantissa, b)});
}
function div_(uint a, Exp memory b) pure internal returns (uint) {
return div_(mul_(a, expScale), b.mantissa);
}
function div_(Double memory a, Double memory b) pure internal returns (Double memory) {
return Double({mantissa: div_(mul_(a.mantissa, doubleScale), b.mantissa)});
}
function div_(Double memory a, uint b) pure internal returns (Double memory) {
return Double({mantissa: div_(a.mantissa, b)});
}
function div_(uint a, Double memory b) pure internal returns (uint) {
return div_(mul_(a, doubleScale), b.mantissa);
}
function div_(uint a, uint b) pure internal returns (uint) {
return div_(a, b, "divide by zero");
}
function div_(uint a, uint b, string memory errorMessage) pure internal returns (uint) {
require(b > 0, errorMessage);
return a / b;
}
function fraction(uint a, uint b) pure internal returns (Double memory) {
return Double({mantissa: div_(mul_(a, doubleScale), b)});
}
}
// File: contracts\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\ReentrancyGuard.sol
pragma solidity ^0.5.16;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied 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.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @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() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// File: contracts\ErrorReporter.sol
pragma solidity ^0.5.16;
contract ErrorReporter {
enum Error {
NO_ERROR,
UNAUTHORIZED,
BAD_INPUT,
REJECTION,
MATH_ERROR,
NOT_FRESH,
TOKEN_INSUFFICIENT_CASH,
TOKEN_TRANSFER_IN_FAILED,
TOKEN_TRANSFER_OUT_FAILED,
INSUFFICIENT_COLLATERAL
}
/*
* Note: FailureInfo (but not Error) is kept in alphabetical order
* This is because FailureInfo grows significantly faster, and
* the order of Error has some meaning, while the order of FailureInfo
* is entirely arbitrary.
*/
enum FailureInfo {
ADMIN_CHECK,
PARTICIPANT_CHECK,
ACCRUE_INTEREST_FAILED,
ACCRUE_INTEREST_ACCUMULATED_INTEREST_CALCULATION_FAILED,
ACCRUE_INTEREST_NEW_BORROW_INDEX_CALCULATION_FAILED,
ACCRUE_INTEREST_NEW_TOTAL_BORROWS_CALCULATION_FAILED,
ACCRUE_INTEREST_NEW_TOTAL_RESERVES_CALCULATION_FAILED,
ACCRUE_INTEREST_SIMPLE_INTEREST_FACTOR_CALCULATION_FAILED,
BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED,
BORROW_CASH_NOT_AVAILABLE,
BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED,
BORROW_REJECTION,
BORROW_INSUFFICIENT_COLLATERAL,
MINT_REJECTION,
MINT_EXCHANGE_CALCULATION_FAILED,
MINT_EXCHANGE_RATE_READ_FAILED,
MINT_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED,
MINT_NEW_TOTAL_SUPPLY_CALCULATION_FAILED,
REDEEM_EXCHANGE_TOKENS_CALCULATION_FAILED,
REDEEM_EXCHANGE_AMOUNT_CALCULATION_FAILED,
REDEEM_EXCHANGE_RATE_READ_FAILED,
REDEEM_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED,
REDEEM_NEW_TOTAL_SUPPLY_CALCULATION_FAILED,
REDEEM_TRANSFER_OUT_NOT_POSSIBLE,
REPAY_BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED,
REPAY_BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED,
REPAY_BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
COLLATERALIZE_REJECTION,
REDEEM_COLLATERAL_ACCUMULATED_BORROW_CALCULATION_FAILED,
REDEEM_COLLATERAL_NEW_ACCOUNT_COLLATERAL_CALCULATION_FAILED,
REDEEM_COLLATERAL_INSUFFICIENT_COLLATERAL,
LIQUIDATE_BORROW_REJECTION,
LIQUIDATE_BORROW_COLLATERAL_RATE_CALCULATION_FAILED,
LIQUIDATE_BORROW_NOT_SATISFIED,
SET_RESERVE_FACTOR_BOUNDS_CHECK,
SET_LIQUIDATE_FACTOR_BOUNDS_CHECK,
TRANSFER_NOT_ALLOWED,
TRANSFER_NOT_ENOUGH,
TRANSFER_TOO_MUCH
}
/**
* @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary
* contract-specific code that enables us to report opaque error codes from upgradeable contracts.
**/
event Failure(uint error, uint info, uint detail);
/**
* @dev use this when reporting a known error from the money market or a non-upgradeable collaborator
*/
function fail(Error err, FailureInfo info) internal returns (uint) {
emit Failure(uint(err), uint(info), 0);
return uint(err);
}
/**
* @dev use this when reporting an opaque error from an upgradeable collaborator contract
*/
function failOpaque(Error err, FailureInfo info, uint opaqueError) internal returns (uint) {
emit Failure(uint(err), uint(info), opaqueError);
return uint(err);
}
}
// File: contracts\InterestRateModel.sol
pragma solidity ^0.5.16;
/**
* @title Compound's InterestRateModel Interface
* @author Compound
*/
contract InterestRateModel {
/// @notice Indicator that this is an InterestRateModel contract (for inspection)
bool public constant isInterestRateModel = true;
/**
* @notice Calculates the current borrow interest rate per block
* @param cash The total amount of cash the market has
* @param borrows The total amount of borrows the market has outstanding
* @param reserves The total amnount of reserves the market has
* @return The borrow rate per block (as a percentage, and scaled by 1e18)
*/
function getBorrowRate(uint cash, uint borrows, uint reserves) external view returns (uint);
/**
* @notice Calculates the current supply interest rate per block
* @param cash The total amount of cash the market has
* @param borrows The total amount of borrows the market has outstanding
* @param reserves The total amnount of reserves the market has
* @param reserveFactorMantissa The current reserve factor the market has
* @return The supply rate per block (as a percentage, and scaled by 1e18)
*/
function getSupplyRate(uint cash, uint borrows, uint reserves, uint reserveFactorMantissa) external view returns (uint);
}
// File: contracts\DFL.sol
pragma solidity ^0.5.16;
pragma experimental ABIEncoderV2;
// forked from Compound/COMP
/**
* @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 {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
_owner = msg.sender;
emit OwnershipTransferred(address(0), msg.sender);
}
/**
* @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 == msg.sender, "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 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 onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
contract DFL is EIP20Interface, Ownable {
/// @notice EIP-20 token name for this token
string public constant name = "DeFIL";
/// @notice EIP-20 token symbol for this token
string public constant symbol = "DFL";
/// @notice EIP-20 token decimals for this token
uint8 public constant decimals = 18;
/// @notice Total number of tokens in circulation
uint96 internal _totalSupply;
/// @notice Allowance amounts on behalf of others
mapping (address => mapping (address => uint96)) internal allowances;
/// @notice Official record of token balances for each account
mapping (address => uint96) internal balances;
/// @notice A record of each accounts delegate
mapping (address => address) public delegates;
/// @notice A checkpoint for marking number of votes from a given block
struct Checkpoint {
uint32 fromBlock;
uint96 votes;
}
/// @notice A record of votes checkpoints for each account, by index
mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;
/// @notice The number of checkpoints for each account
mapping (address => uint32) public numCheckpoints;
/// @notice The EIP-712 typehash for the contract's domain
bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");
/// @notice The EIP-712 typehash for the delegation struct used by the contract
bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
/// @notice A record of states for signing / validating signatures
mapping (address => uint) public nonces;
/// @notice An event thats emitted when an account changes its delegate
event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);
/// @notice An event thats emitted when a delegate account's vote balance changes
event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);
/// @notice The standard EIP-20 transfer event
event Transfer(address indexed from, address indexed to, uint256 amount);
/// @notice The standard EIP-20 approval event
event Approval(address indexed owner, address indexed spender, uint256 amount);
/**
* @notice Construct a new DFL token
*/
constructor() public {
emit Transfer(address(0), address(this), 0);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
* Emits a {Transfer} event with `from` set to the zero address.
* @param account The address of the account holding the new funds
* @param rawAmount The number of tokens that are minted
*/
function mint(address account, uint rawAmount) public onlyOwner {
require(account != address(0), "DFL:: mint: cannot mint to the zero address");
uint96 amount = safe96(rawAmount, "DFL::mint: amount exceeds 96 bits");
_totalSupply = add96(_totalSupply, amount, "DFL::mint: total supply exceeds");
balances[account] = add96(balances[account], amount, "DFL::mint: mint amount exceeds balance");
_moveDelegates(address(0), delegates[account], amount);
emit Transfer(address(0), account, amount);
}
/**
* @notice Get the number of tokens `spender` is approved to spend on behalf of `account`
* @param account The address of the account holding the funds
* @param spender The address of the account spending the funds
* @return The number of tokens approved
*/
function allowance(address account, address spender) external view returns (uint) {
return allowances[account][spender];
}
/**
* @notice Approve `spender` to transfer up to `amount` from `src`
* @dev This will overwrite the approval amount for `spender`
* and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
* @param spender The address of the account which may transfer tokens
* @param rawAmount The number of tokens that are approved (2^256-1 means infinite)
* @return Whether or not the approval succeeded
*/
function approve(address spender, uint rawAmount) external returns (bool) {
uint96 amount;
if (rawAmount == uint(-1)) {
amount = uint96(-1);
} else {
amount = safe96(rawAmount, "DFL::approve: amount exceeds 96 bits");
}
allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
/**
* @notice Get the total supply of tokens
* @return The total supply of tokens
*/
function totalSupply() external view returns (uint) {
return _totalSupply;
}
/**
* @notice Get the number of tokens held by the `account`
* @param account The address of the account to get the balance of
* @return The number of tokens held
*/
function balanceOf(address account) external view returns (uint) {
return balances[account];
}
/**
* @notice Transfer `amount` tokens from `msg.sender` to `dst`
* @param dst The address of the destination account
* @param rawAmount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transfer(address dst, uint rawAmount) external returns (bool) {
uint96 amount = safe96(rawAmount, "DFL::transfer: amount exceeds 96 bits");
_transferTokens(msg.sender, dst, amount);
return true;
}
/**
* @notice Transfer `amount` tokens from `src` to `dst`
* @param src The address of the source account
* @param dst The address of the destination account
* @param rawAmount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transferFrom(address src, address dst, uint rawAmount) external returns (bool) {
address spender = msg.sender;
uint96 spenderAllowance = allowances[src][spender];
uint96 amount = safe96(rawAmount, "DFL::approve: amount exceeds 96 bits");
if (spender != src && spenderAllowance != uint96(-1)) {
uint96 newAllowance = sub96(spenderAllowance, amount, "DFL::transferFrom: transfer amount exceeds spender allowance");
allowances[src][spender] = newAllowance;
emit Approval(src, spender, newAllowance);
}
_transferTokens(src, dst, amount);
return true;
}
/**
* @notice Delegate votes from `msg.sender` to `delegatee`
* @param delegatee The address to delegate votes to
*/
function delegate(address delegatee) public {
return _delegate(msg.sender, delegatee);
}
/**
* @notice Delegates votes from signatory to `delegatee`
* @param delegatee The address to delegate votes to
* @param nonce The contract state required to match the signature
* @param expiry The time at which to expire the signature
* @param v The recovery byte of the signature
* @param r Half of the ECDSA signature pair
* @param s Half of the ECDSA signature pair
*/
function delegateBySig(address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s) public {
bytes32 domainSeparator = keccak256(abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name)), getChainId(), address(this)));
bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));
bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
address signatory = ecrecover(digest, v, r, s);
require(signatory != address(0), "DFL::delegateBySig: invalid signature");
require(nonce == nonces[signatory]++, "DFL::delegateBySig: invalid nonce");
require(block.timestamp <= expiry, "DFL::delegateBySig: signature expired");
return _delegate(signatory, delegatee);
}
/**
* @notice Gets the current votes balance for `account`
* @param account The address to get votes balance
* @return The number of current votes for `account`
*/
function getCurrentVotes(address account) external view returns (uint96) {
uint32 nCheckpoints = numCheckpoints[account];
return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
}
/**
* @notice Determine the prior number of votes for an account as of a block number
* @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
* @param account The address of the account to check
* @param blockNumber The block number to get the vote balance at
* @return The number of votes the account had as of the given block
*/
function getPriorVotes(address account, uint blockNumber) public view returns (uint96) {
require(blockNumber < block.number, "DFL::getPriorVotes: not yet determined");
uint32 nCheckpoints = numCheckpoints[account];
if (nCheckpoints == 0) {
return 0;
}
// First check most recent balance
if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
return checkpoints[account][nCheckpoints - 1].votes;
}
// Next check implicit zero balance
if (checkpoints[account][0].fromBlock > blockNumber) {
return 0;
}
uint32 lower = 0;
uint32 upper = nCheckpoints - 1;
while (upper > lower) {
uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
Checkpoint memory cp = checkpoints[account][center];
if (cp.fromBlock == blockNumber) {
return cp.votes;
} else if (cp.fromBlock < blockNumber) {
lower = center;
} else {
upper = center - 1;
}
}
return checkpoints[account][lower].votes;
}
function _delegate(address delegator, address delegatee) internal {
address currentDelegate = delegates[delegator];
uint96 delegatorBalance = balances[delegator];
delegates[delegator] = delegatee;
emit DelegateChanged(delegator, currentDelegate, delegatee);
_moveDelegates(currentDelegate, delegatee, delegatorBalance);
}
function _transferTokens(address src, address dst, uint96 amount) internal {
require(src != address(0), "DFL::_transferTokens: cannot transfer from the zero address");
require(dst != address(0), "DFL::_transferTokens: cannot transfer to the zero address");
balances[src] = sub96(balances[src], amount, "DFL::_transferTokens: transfer amount exceeds balance");
balances[dst] = add96(balances[dst], amount, "DFL::_transferTokens: transfer amount overflows");
emit Transfer(src, dst, amount);
_moveDelegates(delegates[src], delegates[dst], amount);
}
function _moveDelegates(address srcRep, address dstRep, uint96 amount) internal {
if (srcRep != dstRep && amount > 0) {
if (srcRep != address(0)) {
uint32 srcRepNum = numCheckpoints[srcRep];
uint96 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
uint96 srcRepNew = sub96(srcRepOld, amount, "DFL::_moveVotes: vote amount underflows");
_writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
}
if (dstRep != address(0)) {
uint32 dstRepNum = numCheckpoints[dstRep];
uint96 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
uint96 dstRepNew = add96(dstRepOld, amount, "DFL::_moveVotes: vote amount overflows");
_writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
}
}
}
function _writeCheckpoint(address delegatee, uint32 nCheckpoints, uint96 oldVotes, uint96 newVotes) internal {
uint32 blockNumber = safe32(block.number, "DFL::_writeCheckpoint: block number exceeds 32 bits");
if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
} else {
checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
numCheckpoints[delegatee] = nCheckpoints + 1;
}
emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
}
function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
require(n < 2**32, errorMessage);
return uint32(n);
}
function safe96(uint n, string memory errorMessage) internal pure returns (uint96) {
require(n < 2**96, errorMessage);
return uint96(n);
}
function add96(uint96 a, uint96 b, string memory errorMessage) internal pure returns (uint96) {
uint96 c = a + b;
require(c >= a, errorMessage);
return c;
}
function sub96(uint96 a, uint96 b, string memory errorMessage) internal pure returns (uint96) {
require(b <= a, errorMessage);
return a - b;
}
function getChainId() internal pure returns (uint) {
uint256 chainId;
assembly { chainId := chainid() }
return chainId;
}
}
// File: contracts\DeFIL.sol
pragma solidity ^0.5.16;
// Forked from Compound/CToken
contract DeFIL is ReentrancyGuard, EIP20Interface, Exponential, ErrorReporter {
/**
* @notice EIP-20 token name for this token
*/
string public constant name = "Certificate of eFIL";
/**
* @notice EIP-20 token symbol for this token
*/
string public constant symbol = "ceFIL";
/**
* @notice EIP-20 token decimals for this token
*/
uint8 public constant decimals = 18;
/**
* @notice Maximum fraction of interest that can be set aside for reserves
*/
uint internal constant reserveFactorMaxMantissa = 1e18;
/**
* @notice Address of eFIL token
*/
address public eFILAddress;
/**
* @notice Address of mFIL token
*/
address public mFILAddress;
/**
* @notice The address who owns the reserves
*/
address public reservesOwner;
/**
* @notice Administrator for this contract
*/
address public admin;
/**
* @notice Pending administrator for this contract
*/
address public pendingAdmin;
/**
* @notice Model which tells what the current interest rate should be
*/
InterestRateModel public interestRateModel;
/**
* @notice Initial exchange rate used when minting the first CTokens (used when totalSupply = 0)
*/
uint internal constant initialExchangeRateMantissa = 0.002e18; // 1 eFIL = 500 ceFIL
/**
* @notice Fraction of interest currently set aside for reserves
*/
uint public reserveFactorMantissa;
/**
* @notice Block number that interest was last accrued at
*/
uint public accrualBlockNumber;
/**
* @notice Accumulator of the total earned interest rate since the opening
*/
uint public borrowIndex;
/**
* @notice Total amount of outstanding borrows of the underlying
*/
uint public totalBorrows;
/**
* @notice Total amount of reserves of the underlying held
*/
uint public totalReserves;
/**
* @notice Total number of tokens in circulation
*/
uint public totalSupply;
// Is mint allowed.
bool public mintAllowed;
// Is borrow allowed.
bool public borrowAllowed;
/**
* @notice Official record of token balances for each account
*/
mapping (address => uint) internal accountTokens;
/**
* @notice Approved token transfer amounts on behalf of others
*/
mapping (address => mapping (address => uint)) internal transferAllowances;
/**
* @notice Container for borrow balance information
* @member principal Total balance (with accrued interest), after applying the most recent balance-changing action
* @member interestIndex Global borrowIndex as of the most recent balance-changing action
*/
struct BorrowSnapshot {
uint principal;
uint interestIndex;
}
/**
* @notice Mapping of account addresses to outstanding borrow balances
*/
mapping(address => BorrowSnapshot) internal accountBorrows;
// Total collaterals
uint public totalCollaterals;
// Mapping of account to outstanding collateral balances
mapping (address => uint) internal accountCollaterals;
// Multiplier used to decide when liquidate borrow is allowed
uint public liquidateFactorMantissa;
// No liquidateFactorMantissa may bellows this value
uint internal constant liquidateFactorMinMantissa = 1e18; // 100%
/*** For DFL ***/
/**
* @notice Address of DFL token
*/
DFL public dflToken;
// By using the special 'min speed=0.00017e18' and 'start speed=86.805721e18'
// We will got 99999999.8568 DFLs in the end.
// The havle period in block number
uint internal constant halvePeriod = 576000; // 100 days
// Minimum speed
uint internal constant minSpeed = 0.00017e18; // 1e18 / 5760
// Current speed (per block)
uint public currentSpeed = 86.805721e18; // 500000e18 / 5760; // start with 500,000 per day
// The block number when next havle will happens
uint public nextHalveBlockNumber;
// The address of uniswap incentive contract for receiving DFL
address public uniswapAddress;
// The address of miner league for receiving DFL
address public minerLeagueAddress;
// The address of operator for receiving DFL
address public operatorAddress;
// The address of technical support for receiving DFL
address public technicalAddress;
// The address for undistributed DFL
address public undistributedAddress;
// The percentage of DFL distributes to uniswap incentive
uint public uniswapPercentage;
// The percentage of DFL distributes to miner league
uint public minerLeaguePercentage;
// The percentage of DFL distributes to operator
uint public operatorPercentage;
// The percentage of DFL distributes to technical support, unupdatable
uint internal constant technicalPercentage = 0.02e18; // 2%
// The threshold above which the flywheel transfers DFL
uint internal constant dflClaimThreshold = 0.1e18; // 0.1 DFL
// Block number that DFL was last accrued at
uint public dflAccrualBlockNumber;
// The last updated index of DFL for suppliers
uint public dflSupplyIndex;
// The initial dfl supply index
uint internal constant dflInitialSupplyIndex = 1e36;
// The index for each supplier as of the last time they accrued DFL
mapping(address => uint) public dflSupplierIndex;
// The DFL accrued but not yet transferred to each user
mapping(address => uint) public dflAccrued;
/*** Events ***/
/**
* @notice Event emitted when interest is accrued
*/
event AccrueInterest(uint cashPrior, uint interestAccumulated, uint borrowIndex, uint totalBorrows);
/**
* @notice Event emitted when tokens are minted
*/
event Mint(address minter, uint mintAmount, uint mintTokens);
/**
* @notice Event emitted when mFIL are collateralized
*/
event Collateralize(address collateralizer, uint collateralizeAmount);
/**
* @notice Event emitted when tokens are redeemed
*/
event Redeem(address redeemer, uint redeemAmount, uint redeemTokens);
/**
* @notice Event emitted when underlying is borrowed
*/
event Borrow(address borrower, uint borrowAmount, uint accountBorrows, uint totalBorrows);
/**
* @notice Event emitted when a borrow is repaid
*/
event RepayBorrow(address payer, address borrower, uint repayAmount, uint accountBorrows, uint totalBorrows);
/**
* @notice Event emitted when collaterals are redeemed
*/
event RedeemCollateral(address redeemer, uint redeemAmount);
/**
* @notice Event emitted when a liquidate borrow is repaid
*/
event LiquidateBorrow(address liquidator, address borrower, uint accountBorrows, uint accountCollaterals);
/*** Admin Events ***/
/**
* @notice Event emitted when pendingAdmin is changed
*/
event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);
/**
* @notice Event emitted when pendingAdmin is accepted, which means admin is updated
*/
event NewAdmin(address oldAdmin, address newAdmin);
/**
* @notice Event emitted when mintAllowed is changed
*/
event MintAllowed(bool mintAllowed);
/**
* @notice Event emitted when borrowAllowed is changed
*/
event BorrowAllowed(bool borrowAllowed);
/**
* @notice Event emitted when interestRateModel is changed
*/
event NewInterestRateModel(InterestRateModel oldInterestRateModel, InterestRateModel newInterestRateModel);
/**
* @notice Event emitted when the reserve factor is changed
*/
event NewReserveFactor(uint oldReserveFactorMantissa, uint newReserveFactorMantissa);
/**
* @notice Event emitted when the liquidate factor is changed
*/
event NewLiquidateFactor(uint oldLiquidateFactorMantissa, uint newLiquidateFactorMantissa);
/**
* @notice EIP20 Transfer event
*/
event Transfer(address indexed from, address indexed to, uint amount);
/**
* @notice EIP20 Approval event
*/
event Approval(address indexed owner, address indexed spender, uint amount);
/**
* @notice Failure event
*/
event Failure(uint error, uint info, uint detail);
// Event emitted when reserves owner is changed
event ReservesOwnerChanged(address oldAddress, address newAddress);
// Event emitted when uniswap address is changed
event UniswapAddressChanged(address oldAddress, address newAddress);
// Event emitted when miner leagure address is changed
event MinerLeagueAddressChanged(address oldAddress, address newAddress);
// Event emitted when operator address is changed
event OperatorAddressChanged(address oldAddress, address newAddress);
// Event emitted when technical address is changed
event TechnicalAddressChanged(address oldAddress, address newAddress);
// Event emitted when undistributed address is changed
event UndistributedAddressChanged(address oldAddress, address newAddress);
// Event emitted when reserved is reduced
event ReservesReduced(address toTho, uint amount);
// Event emitted when DFL is accrued
event AccrueDFL(uint uniswapPart, uint minerLeaguePart, uint operatorPart, uint technicalPart, uint supplyPart, uint dflSupplyIndex);
// Emitted when DFL is distributed to a supplier
event DistributedDFL(address supplier, uint supplierDelta);
// Event emitted when DFL percentage is changed
event PercentagesChanged(uint uniswapPercentage, uint minerLeaguePercentage, uint operatorPercentage);
/**
* @notice constructor
*/
constructor(address interestRateModelAddress,
address eFILAddress_,
address mFILAddress_,
address dflAddress_,
address reservesOwner_,
address uniswapAddress_,
address minerLeagueAddress_,
address operatorAddress_,
address technicalAddress_,
address undistributedAddress_) public {
// set admin
admin = msg.sender;
// Initialize block number and borrow index
accrualBlockNumber = getBlockNumber();
borrowIndex = mantissaOne;
// reserve 50%
uint err = _setReserveFactorFresh(0.5e18);
require(err == uint(Error.NO_ERROR), "setting reserve factor failed");
// set liquidate factor to 200%
err = _setLiquidateFactorFresh(2e18);
require(err == uint(Error.NO_ERROR), "setting liquidate factor failed");
// Set the interest rate model (depends on block number / borrow index)
err = _setInterestRateModelFresh(InterestRateModel(interestRateModelAddress));
require(err == uint(Error.NO_ERROR), "setting interest rate model failed");
// uniswapPercentage = 0.25e18; // 25%
// minerLeaguePercentage = 0.1e18; // 10%
// operatorPercentage = 0.03e18; // 3%
err = _setDFLPercentagesFresh(0.25e18, 0.1e18, 0.03e18);
require(err == uint(Error.NO_ERROR), "setting DFL percentages failed");
// allow mint/borrow
mintAllowed = true;
borrowAllowed = true;
// token addresses & tokens
eFILAddress = eFILAddress_;
mFILAddress = mFILAddress_;
dflToken = DFL(dflAddress_);
// set owner of reserves
reservesOwner = reservesOwner_;
// DFL
dflAccrualBlockNumber = getBlockNumber();
dflSupplyIndex = dflInitialSupplyIndex;
nextHalveBlockNumber = dflAccrualBlockNumber + halvePeriod;
// DFL addresses
uniswapAddress = uniswapAddress_;
minerLeagueAddress = minerLeagueAddress_;
operatorAddress = operatorAddress_;
technicalAddress = technicalAddress_;
undistributedAddress = undistributedAddress_;
emit Transfer(address(0), address(this), 0);
}
/**
* @notice Transfer `tokens` tokens from `src` to `dst` by `spender`
* @dev Called by both `transfer` and `transferFrom` internally
* @param spender The address of the account performing the transfer
* @param src The address of the source account
* @param dst The address of the destination account
* @param tokens The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transferTokens(address spender, address src, address dst, uint tokens) internal returns (uint) {
/* Do not allow self-transfers */
if (src == dst || dst == address(0)) {
return fail(Error.BAD_INPUT, FailureInfo.TRANSFER_NOT_ALLOWED);
}
// Keep the flywheel moving
accrueDFL();
distributeSupplierDFL(src, false);
distributeSupplierDFL(dst, false);
/* Get the allowance, infinite for the account owner */
uint startingAllowance = 0;
if (spender == src) {
startingAllowance = uint(-1);
} else {
startingAllowance = transferAllowances[src][spender];
}
/* Do the calculations, checking for {under,over}flow */
MathError mathErr;
uint allowanceNew;
uint srcTokensNew;
uint dstTokensNew;
(mathErr, allowanceNew) = subUInt(startingAllowance, tokens);
if (mathErr != MathError.NO_ERROR) {
return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_NOT_ALLOWED);
}
(mathErr, srcTokensNew) = subUInt(accountTokens[src], tokens);
if (mathErr != MathError.NO_ERROR) {
return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_NOT_ENOUGH);
}
(mathErr, dstTokensNew) = addUInt(accountTokens[dst], tokens);
if (mathErr != MathError.NO_ERROR) {
return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_TOO_MUCH);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
accountTokens[src] = srcTokensNew;
accountTokens[dst] = dstTokensNew;
/* Eat some of the allowance (if necessary) */
if (startingAllowance != uint(-1)) {
transferAllowances[src][spender] = allowanceNew;
}
/* We emit a Transfer event */
emit Transfer(src, dst, tokens);
return uint(Error.NO_ERROR);
}
/**
* @notice Transfer `amount` tokens from `msg.sender` to `dst`
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transfer(address dst, uint256 amount) external nonReentrant returns (bool) {
return transferTokens(msg.sender, msg.sender, dst, amount) == uint(Error.NO_ERROR);
}
/**
* @notice Transfer `amount` tokens from `src` to `dst`
* @param src The address of the source account
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transferFrom(address src, address dst, uint256 amount) external nonReentrant returns (bool) {
return transferTokens(msg.sender, src, dst, amount) == uint(Error.NO_ERROR);
}
/**
* @notice Approve `spender` to transfer up to `amount` from `src`
* @dev This will overwrite the approval amount for `spender`
* and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
* @param spender The address of the account which may transfer tokens
* @param amount The number of tokens that are approved (-1 means infinite)
* @return Whether or not the approval succeeded
*/
function approve(address spender, uint256 amount) external returns (bool) {
require(spender != address(0), "cannot approve to the zero address");
address src = msg.sender;
transferAllowances[src][spender] = amount;
emit Approval(src, spender, amount);
return true;
}
/**
* @notice Get the current allowance from `owner` for `spender`
* @param owner The address of the account which owns the tokens to be spent
* @param spender The address of the account which may transfer tokens
* @return The number of tokens allowed to be spent (-1 means infinite)
*/
function allowance(address owner, address spender) external view returns (uint256) {
return transferAllowances[owner][spender];
}
/**
* @notice Get the token balance of the `owner`
* @param owner The address of the account to query
* @return The number of tokens owned by `owner`
*/
function balanceOf(address owner) external view returns (uint256) {
return accountTokens[owner];
}
/**
* @notice Get the underlying balance of the `owner`
* @dev This also accrues interest in a transaction
* @param owner The address of the account to query
* @return The amount of underlying owned by `owner`
*/
function balanceOfUnderlying(address owner) external returns (uint) {
Exp memory exchangeRate = Exp({mantissa: exchangeRateCurrent()});
(MathError mErr, uint balance) = mulScalarTruncate(exchangeRate, accountTokens[owner]);
require(mErr == MathError.NO_ERROR, "balance could not be calculated");
return balance;
}
/**
* @notice Get the collateral of the `account`
* @param account The address of the account to query
* @return The number of collaterals owned by `account`
*/
function getCollateral(address account) external view returns (uint256) {
return accountCollaterals[account];
}
/**
* @dev Function to simply retrieve block number
* This exists mainly for inheriting test contracts to stub this result.
*/
function getBlockNumber() internal view returns (uint) {
return block.number;
}
/**
* @notice Returns the current per-block borrow interest rate
* @return The borrow interest rate per block, scaled by 1e18
*/
function borrowRatePerBlock() external view returns (uint) {
return interestRateModel.getBorrowRate(getCashPrior(), totalBorrows, totalReserves);
}
/**
* @notice Returns the current per-block supply interest rate
* @return The supply interest rate per block, scaled by 1e18
*/
function supplyRatePerBlock() external view returns (uint) {
return interestRateModel.getSupplyRate(getCashPrior(), totalBorrows, totalReserves, reserveFactorMantissa);
}
/**
* @notice Returns the current total borrows plus accrued interest
* @return The total borrows with interest
*/
function totalBorrowsCurrent() external nonReentrant returns (uint) {
require(accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed");
return totalBorrows;
}
/**
* @notice Accrue interest to updated borrowIndex and then calculate account's borrow balance using the updated borrowIndex
* @param account The address whose balance should be calculated after updating borrowIndex
* @return The calculated balance
*/
function borrowBalanceCurrent(address account) external nonReentrant returns (uint) {
require(accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed");
return borrowBalanceStored(account);
}
/**
* @notice Return the borrow balance of account based on stored data
* @param account The address whose balance should be calculated
* @return The calculated balance
*/
function borrowBalanceStored(address account) public view returns (uint) {
(MathError err, uint result) = borrowBalanceStoredInternal(account);
require(err == MathError.NO_ERROR, "borrowBalanceStored: borrowBalanceStoredInternal failed");
return result;
}
/**
* @notice Return the borrow balance of account based on stored data
* @param account The address whose balance should be calculated
* @return (error code, the calculated balance or 0 if error code is non-zero)
*/
function borrowBalanceStoredInternal(address account) internal view returns (MathError, uint) {
/* Note: we do not assert that is up to date */
MathError mathErr;
uint principalTimesIndex;
uint result;
/* Get borrowBalance and borrowIndex */
BorrowSnapshot storage borrowSnapshot = accountBorrows[account];
/* If borrowBalance = 0 then borrowIndex is likely also 0.
* Rather than failing the calculation with a division by 0, we immediately return 0 in this case.
*/
if (borrowSnapshot.principal == 0) {
return (MathError.NO_ERROR, 0);
}
/* Calculate new borrow balance using the interest index:
* recentBorrowBalance = borrower.borrowBalance * global.borrowIndex / borrower.borrowIndex
*/
(mathErr, principalTimesIndex) = mulUInt(borrowSnapshot.principal, borrowIndex);
if (mathErr != MathError.NO_ERROR) {
return (mathErr, 0);
}
(mathErr, result) = divUInt(principalTimesIndex, borrowSnapshot.interestIndex);
if (mathErr != MathError.NO_ERROR) {
return (mathErr, 0);
}
return (MathError.NO_ERROR, result);
}
/**
* @notice Accrue interest then return the up-to-date exchange rate
* @return Calculated exchange rate scaled by 1e18
*/
function exchangeRateCurrent() public returns (uint) {
require(accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed");
return exchangeRateStored();
}
/**
* @notice Calculates the exchange rate from the underlying to the ceFIL
* @dev This function does not accrue interest before calculating the exchange rate
* @return Calculated exchange rate scaled by 1e18
*/
function exchangeRateStored() public view returns (uint) {
(MathError err, uint result) = exchangeRateStoredInternal();
require(err == MathError.NO_ERROR, "exchangeRateStored: exchangeRateStoredInternal failed");
return result;
}
/**
* @notice Calculates the exchange rate from the underlying to the ceFIL
* @dev This function does not accrue interest before calculating the exchange rate
* @return (error code, calculated exchange rate scaled by 1e18)
*/
function exchangeRateStoredInternal() internal view returns (MathError, uint) {
uint _totalSupply = totalSupply;
if (_totalSupply == 0) {
/*
* If there are no tokens minted:
* exchangeRate = initialExchangeRate
*/
return (MathError.NO_ERROR, initialExchangeRateMantissa);
} else {
/*
* Otherwise:
* exchangeRate = (totalCash + totalBorrows - totalReserves) / totalSupply
*/
uint totalCash = getCashPrior();
uint cashPlusBorrowsMinusReserves;
Exp memory exchangeRate;
MathError mathErr;
(mathErr, cashPlusBorrowsMinusReserves) = addThenSubUInt(totalCash, totalBorrows, totalReserves);
if (mathErr != MathError.NO_ERROR) {
return (mathErr, 0);
}
(mathErr, exchangeRate) = getExp(cashPlusBorrowsMinusReserves, _totalSupply);
if (mathErr != MathError.NO_ERROR) {
return (mathErr, 0);
}
return (MathError.NO_ERROR, exchangeRate.mantissa);
}
}
/**
* @notice Accrue interest then return the up-to-date collateral rate
* @return Calculated collateral rate scaled by 1e18
*/
function collateralRateCurrent(address borrower) external returns (uint) {
require(accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed");
return collateralRateStored(borrower);
}
/**
* @notice Calculates the collateral rate of borrower from stored states
* @dev This function does not accrue interest before calculating the collateral rate
* @return Calculated exchange rate scaled by 1e18
*/
function collateralRateStored(address borrower) public view returns (uint) {
(MathError err, uint rate, ,) = collateralRateInternal(borrower);
require(err == MathError.NO_ERROR, "collateralRateStored: collateralRateInternal failed");
return rate;
}
function collateralRateInternal(address borrower) internal view returns (MathError, uint, uint, uint) {
MathError mathErr;
uint _accountBorrows;
uint _accountCollaterals;
Exp memory collateralRate;
(mathErr, _accountBorrows) = borrowBalanceStoredInternal(borrower);
if (mathErr != MathError.NO_ERROR) {
return (mathErr, 0, 0, 0);
}
_accountCollaterals = accountCollaterals[borrower];
(mathErr, collateralRate) = getExp(_accountBorrows, _accountCollaterals);
if (mathErr != MathError.NO_ERROR) {
return (mathErr, 0, 0, 0);
}
return (MathError.NO_ERROR, collateralRate.mantissa, _accountBorrows, _accountCollaterals);
}
// Accrue DFL then return the up-to-date accrued amount
function accruedDFLCurrent(address supplier) external nonReentrant returns (uint) {
accrueDFL();
return accruedDFLStoredInternal(supplier);
}
// Accrue DFL then return the up-to-date accrued amount
function accruedDFLStored(address supplier) public view returns (uint) {
return accruedDFLStoredInternal(supplier);
}
// Return the accrued DFL of account based on stored data
function accruedDFLStoredInternal(address supplier) internal view returns(uint) {
Double memory supplyIndex = Double({mantissa: dflSupplyIndex});
Double memory supplierIndex = Double({mantissa: dflSupplierIndex[supplier]});
if (supplierIndex.mantissa == 0 && supplyIndex.mantissa > 0) {
supplierIndex.mantissa = dflInitialSupplyIndex;
}
Double memory deltaIndex = sub_(supplyIndex, supplierIndex);
uint supplierDelta = mul_(accountTokens[supplier], deltaIndex);
uint supplierAccrued = add_(dflAccrued[supplier], supplierDelta);
return supplierAccrued;
}
/**
* @notice Get cash balance of this in the underlying asset
* @return The quantity of underlying asset owned by this contract
*/
function getCash() external view returns (uint) {
return getCashPrior();
}
/**
* @notice Applies accrued interest to total borrows and reserves
* @dev This calculates interest accrued from the last checkpointed block
* up to the current block and writes new checkpoint to storage.
*/
function accrueInterest() public returns (uint) {
/* Remember the initial block number */
uint currentBlockNumber = getBlockNumber();
uint accrualBlockNumberPrior = accrualBlockNumber;
/* Short-circuit accumulating 0 interest */
if (accrualBlockNumberPrior == currentBlockNumber) {
return uint(Error.NO_ERROR);
}
/* Read the previous values out of storage */
uint cashPrior = getCashPrior();
uint borrowsPrior = totalBorrows;
uint reservesPrior = totalReserves;
uint borrowIndexPrior = borrowIndex;
/* Calculate the current borrow interest rate */
uint borrowRateMantissa = interestRateModel.getBorrowRate(cashPrior, borrowsPrior, reservesPrior);
/* Calculate the number of blocks elapsed since the last accrual */
(MathError mathErr, uint blockDelta) = subUInt(currentBlockNumber, accrualBlockNumberPrior);
require(mathErr == MathError.NO_ERROR, "could not calculate block delta");
/*
* Calculate the interest accumulated into borrows and reserves and the new index:
* simpleInterestFactor = borrowRate * blockDelta
* interestAccumulated = simpleInterestFactor * totalBorrows
* totalBorrowsNew = interestAccumulated + totalBorrows
* totalReservesNew = interestAccumulated * reserveFactor + totalReserves
* borrowIndexNew = simpleInterestFactor * borrowIndex + borrowIndex
*/
Exp memory simpleInterestFactor;
uint interestAccumulated;
uint totalBorrowsNew;
uint totalReservesNew;
uint borrowIndexNew;
(mathErr, simpleInterestFactor) = mulScalar(Exp({mantissa: borrowRateMantissa}), blockDelta);
if (mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.ACCRUE_INTEREST_SIMPLE_INTEREST_FACTOR_CALCULATION_FAILED, uint(mathErr));
}
(mathErr, interestAccumulated) = mulScalarTruncate(simpleInterestFactor, borrowsPrior);
if (mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.ACCRUE_INTEREST_ACCUMULATED_INTEREST_CALCULATION_FAILED, uint(mathErr));
}
(mathErr, totalBorrowsNew) = addUInt(interestAccumulated, borrowsPrior);
if (mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.ACCRUE_INTEREST_NEW_TOTAL_BORROWS_CALCULATION_FAILED, uint(mathErr));
}
(mathErr, totalReservesNew) = mulScalarTruncateAddUInt(Exp({mantissa: reserveFactorMantissa}), interestAccumulated, reservesPrior);
if (mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.ACCRUE_INTEREST_NEW_TOTAL_RESERVES_CALCULATION_FAILED, uint(mathErr));
}
(mathErr, borrowIndexNew) = mulScalarTruncateAddUInt(simpleInterestFactor, borrowIndexPrior, borrowIndexPrior);
if (mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.ACCRUE_INTEREST_NEW_BORROW_INDEX_CALCULATION_FAILED, uint(mathErr));
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
/* We write the previously calculated values into storage */
accrualBlockNumber = currentBlockNumber;
borrowIndex = borrowIndexNew;
totalBorrows = totalBorrowsNew;
totalReserves = totalReservesNew;
/* We emit an AccrueInterest event */
emit AccrueInterest(cashPrior, interestAccumulated, borrowIndexNew, totalBorrowsNew);
return uint(Error.NO_ERROR);
}
/**
* @notice Sender supplies assets into and receives cTokens in exchange
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param mintAmount The amount of the underlying asset to supply
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function mint(uint mintAmount) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
distributeSupplierDFL(msg.sender, false);
// mintFresh emits the actual Mint event if successful and logs on errors, so we don't need to
(err,) = mintFresh(msg.sender, mintAmount);
return err;
}
struct MintLocalVars {
Error err;
MathError mathErr;
uint exchangeRateMantissa;
uint mintTokens;
uint totalSupplyNew;
uint accountTokensNew;
uint actualMintAmount;
}
/**
* @notice User supplies assets into and receives cTokens in exchange
* @dev Assumes interest has already been accrued up to the current block
* @param minter The address of the account which is supplying the assets
* @param mintAmount The amount of the underlying asset to supply
* @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual mint amount.
*/
function mintFresh(address minter, uint mintAmount) internal returns (uint, uint) {
if (!mintAllowed || accountCollaterals[minter] != 0) {
return (fail(Error.REJECTION, FailureInfo.MINT_REJECTION), 0);
}
MintLocalVars memory vars;
(vars.mathErr, vars.exchangeRateMantissa) = exchangeRateStoredInternal();
if (vars.mathErr != MathError.NO_ERROR) {
return (failOpaque(Error.MATH_ERROR, FailureInfo.MINT_EXCHANGE_RATE_READ_FAILED, uint(vars.mathErr)), 0);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
vars.actualMintAmount = doTransferIn(eFILAddress, minter, mintAmount);
/*
* We get the current exchange rate and calculate the number of cTokens to be minted:
* mintTokens = actualMintAmount / exchangeRate
*/
(vars.mathErr, vars.mintTokens) = divScalarByExpTruncate(vars.actualMintAmount, Exp({mantissa: vars.exchangeRateMantissa}));
require(vars.mathErr == MathError.NO_ERROR, "MINT_EXCHANGE_CALCULATION_FAILED");
/*
* We calculate the new total supply of cTokens and minter token balance, checking for overflow:
* totalSupplyNew = totalSupply + mintTokens
* accountTokensNew = accountTokens[minter] + mintTokens
*/
(vars.mathErr, vars.totalSupplyNew) = addUInt(totalSupply, vars.mintTokens);
require(vars.mathErr == MathError.NO_ERROR, "MINT_NEW_TOTAL_SUPPLY_CALCULATION_FAILED");
(vars.mathErr, vars.accountTokensNew) = addUInt(accountTokens[minter], vars.mintTokens);
require(vars.mathErr == MathError.NO_ERROR, "MINT_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED");
/* We write previously calculated values into storage */
totalSupply = vars.totalSupplyNew;
accountTokens[minter] = vars.accountTokensNew;
/* We emit a Mint event, and a Transfer event */
emit Mint(minter, vars.actualMintAmount, vars.mintTokens);
emit Transfer(address(this), minter, vars.mintTokens);
return (uint(Error.NO_ERROR), vars.actualMintAmount);
}
/**
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param collateralizeAmount The amount of the underlying asset to collateralize
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function collateralize(uint collateralizeAmount) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
(err,) = collateralizeFresh(msg.sender, collateralizeAmount);
return err;
}
struct CollateralizeLocalVars {
Error err;
MathError mathErr;
uint totalCollateralsNew;
uint accountCollateralsNew;
uint actualCollateralizeAmount;
}
/**
* @param collateralizer The address of the account which is supplying the assets
* @param collateralizeAmount The amount of the underlying asset to supply
* @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual collateralize amount.
*/
function collateralizeFresh(address collateralizer, uint collateralizeAmount) internal returns (uint, uint) {
if (accountTokens[collateralizer] != 0) {
return (fail(Error.REJECTION, FailureInfo.COLLATERALIZE_REJECTION), 0);
}
CollateralizeLocalVars memory vars;
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
vars.actualCollateralizeAmount = doTransferIn(mFILAddress, collateralizer, collateralizeAmount);
(vars.mathErr, vars.totalCollateralsNew) = addUInt(totalCollaterals, vars.actualCollateralizeAmount);
require(vars.mathErr == MathError.NO_ERROR, "COLLATERALIZE_NEW_TOTAL_COLLATERALS_CALCULATION_FAILED");
(vars.mathErr, vars.accountCollateralsNew) = addUInt(accountCollaterals[collateralizer], vars.actualCollateralizeAmount);
require(vars.mathErr == MathError.NO_ERROR, "COLLATERALIZE_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED");
/* We write previously calculated values into storage */
totalCollaterals = vars.totalCollateralsNew;
accountCollaterals[collateralizer] = vars.accountCollateralsNew;
/* We emit a Collateralize event, and a Transfer event */
emit Collateralize(collateralizer, vars.actualCollateralizeAmount);
return (uint(Error.NO_ERROR), vars.actualCollateralizeAmount);
}
/**
* @notice Sender redeems cTokens in exchange for the underlying asset
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param redeemTokens The number of cTokens to redeem into underlying
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeem(uint redeemTokens) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
distributeSupplierDFL(msg.sender, false);
// redeemFresh emits redeem-specific logs on errors, so we don't need to
return redeemFresh(msg.sender, redeemTokens, 0);
}
/**
* @notice Sender redeems cTokens in exchange for a specified amount of underlying asset
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param redeemAmount The amount of underlying to redeem
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeemUnderlying(uint redeemAmount) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
distributeSupplierDFL(msg.sender, false);
// redeemFresh emits redeem-specific logs on errors, so we don't need to
return redeemFresh(msg.sender, 0, redeemAmount);
}
struct RedeemLocalVars {
Error err;
MathError mathErr;
uint exchangeRateMantissa;
uint redeemTokens;
uint redeemAmount;
uint totalSupplyNew;
uint accountTokensNew;
}
/**
* @notice User redeems cTokens in exchange for the underlying asset
* @dev Assumes interest has already been accrued up to the current block
* @param redeemer The address of the account which is redeeming the tokens
* @param redeemTokensIn The number of cTokens to redeem into underlying (only one of redeemTokensIn or redeemAmountIn may be non-zero)
* @param redeemAmountIn The number of underlying tokens to receive from redeeming cTokens (only one of redeemTokensIn or redeemAmountIn may be non-zero)
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeemFresh(address redeemer, uint redeemTokensIn, uint redeemAmountIn) internal returns (uint) {
require(redeemTokensIn == 0 || redeemAmountIn == 0, "one of redeemTokensIn or redeemAmountIn must be zero");
RedeemLocalVars memory vars;
/* exchangeRate = invoke Exchange Rate Stored() */
(vars.mathErr, vars.exchangeRateMantissa) = exchangeRateStoredInternal();
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_EXCHANGE_RATE_READ_FAILED, uint(vars.mathErr));
}
/* If redeemTokensIn > 0: */
if (redeemTokensIn > 0) {
/*
* We calculate the exchange rate and the amount of underlying to be redeemed:
* redeemTokens = redeemTokensIn
* redeemAmount = redeemTokensIn x exchangeRateCurrent
*/
vars.redeemTokens = redeemTokensIn;
(vars.mathErr, vars.redeemAmount) = mulScalarTruncate(Exp({mantissa: vars.exchangeRateMantissa}), redeemTokensIn);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_EXCHANGE_TOKENS_CALCULATION_FAILED, uint(vars.mathErr));
}
} else {
/*
* We get the current exchange rate and calculate the amount to be redeemed:
* redeemTokens = redeemAmountIn / exchangeRate
* redeemAmount = redeemAmountIn
*/
(vars.mathErr, vars.redeemTokens) = divScalarByExpTruncate(redeemAmountIn, Exp({mantissa: vars.exchangeRateMantissa}));
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_EXCHANGE_AMOUNT_CALCULATION_FAILED, uint(vars.mathErr));
}
vars.redeemAmount = redeemAmountIn;
}
/*
* We calculate the new total supply and redeemer balance, checking for underflow:
* totalSupplyNew = totalSupply - redeemTokens
* accountTokensNew = accountTokens[redeemer] - redeemTokens
*/
(vars.mathErr, vars.totalSupplyNew) = subUInt(totalSupply, vars.redeemTokens);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_NEW_TOTAL_SUPPLY_CALCULATION_FAILED, uint(vars.mathErr));
}
(vars.mathErr, vars.accountTokensNew) = subUInt(accountTokens[redeemer], vars.redeemTokens);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED, uint(vars.mathErr));
}
/* Fail gracefully if protocol has insufficient cash */
if (getCashPrior() < vars.redeemAmount) {
return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.REDEEM_TRANSFER_OUT_NOT_POSSIBLE);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
doTransferOut(eFILAddress, redeemer, vars.redeemAmount);
/* We write previously calculated values into storage */
totalSupply = vars.totalSupplyNew;
accountTokens[redeemer] = vars.accountTokensNew;
/* We emit a Transfer event, and a Redeem event */
emit Transfer(redeemer, address(this), vars.redeemTokens);
emit Redeem(redeemer, vars.redeemAmount, vars.redeemTokens);
return uint(Error.NO_ERROR);
}
/**
* @notice Sender borrows assets from the protocol to their own address
* @param borrowAmount The amount of the underlying asset to borrow
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function borrow(uint borrowAmount) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
// borrowFresh emits borrow-specific logs on errors, so we don't need to
return borrowFresh(msg.sender, borrowAmount);
}
struct BorrowLocalVars {
MathError mathErr;
uint actualBorrowAmount;
uint accountBorrows;
uint accountBorrowsNew;
uint totalBorrowsNew;
}
/**
* @notice Users borrow assets from the protocol to their own address
* @param borrowAmount The amount of the underlying asset to borrow
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function borrowFresh(address borrower, uint borrowAmount) internal returns (uint) {
if (!borrowAllowed) {
return fail(Error.REJECTION, FailureInfo.BORROW_REJECTION);
}
BorrowLocalVars memory vars;
(vars.mathErr, vars.accountBorrows) = borrowBalanceStoredInternal(borrower);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED, uint(vars.mathErr));
}
if (borrowAmount == uint(-1)) {
vars.actualBorrowAmount = accountCollaterals[borrower] > vars.accountBorrows ? accountCollaterals[borrower] - vars.accountBorrows : 0;
} else {
vars.actualBorrowAmount = borrowAmount;
}
/* Fail gracefully if protocol has insufficient underlying cash */
if (getCashPrior() < vars.actualBorrowAmount) {
return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.BORROW_CASH_NOT_AVAILABLE);
}
/*
* We calculate the new borrower and total borrow balances, failing on overflow:
* accountBorrowsNew = accountBorrows + actualBorrowAmount
* totalBorrowsNew = totalBorrows + actualBorrowAmount
*/
(vars.mathErr, vars.accountBorrowsNew) = addUInt(vars.accountBorrows, vars.actualBorrowAmount);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED, uint(vars.mathErr));
}
// Check collaterals
if (accountCollaterals[borrower] < vars.accountBorrowsNew) {
return fail(Error.INSUFFICIENT_COLLATERAL, FailureInfo.BORROW_INSUFFICIENT_COLLATERAL);
}
(vars.mathErr, vars.totalBorrowsNew) = addUInt(totalBorrows, vars.actualBorrowAmount);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED, uint(vars.mathErr));
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
doTransferOut(eFILAddress, borrower, vars.actualBorrowAmount);
/* We write the previously calculated values into storage */
accountBorrows[borrower].principal = vars.accountBorrowsNew;
accountBorrows[borrower].interestIndex = borrowIndex;
totalBorrows = vars.totalBorrowsNew;
/* We emit a Borrow event */
emit Borrow(borrower, vars.actualBorrowAmount, vars.accountBorrowsNew, vars.totalBorrowsNew);
return uint(Error.NO_ERROR);
}
/**
* @notice Sender repays their own borrow
* @param repayAmount The amount to repay
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function repayBorrow(uint repayAmount) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
// repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
(err,) = repayBorrowFresh(msg.sender, msg.sender, repayAmount);
return err;
}
/**
* @notice Sender repays a borrow belonging to borrower
* @param borrower the account with the debt being payed off
* @param repayAmount The amount to repay
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function repayBorrowBehalf(address borrower, uint repayAmount) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
// repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
(err,) = repayBorrowFresh(msg.sender, borrower, repayAmount);
return err;
}
struct RepayBorrowLocalVars {
Error err;
MathError mathErr;
uint repayAmount;
uint borrowerIndex;
uint accountBorrows;
uint accountBorrowsNew;
uint totalBorrowsNew;
uint actualRepayAmount;
}
/**
* @notice Borrows are repaid by another user (possibly the borrower).
* @param payer the account paying off the borrow
* @param borrower the account with the debt being payed off
* @param repayAmount the amount of undelrying tokens being returned
* @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
*/
function repayBorrowFresh(address payer, address borrower, uint repayAmount) internal returns (uint, uint) {
RepayBorrowLocalVars memory vars;
/* We remember the original borrowerIndex for verification purposes */
vars.borrowerIndex = accountBorrows[borrower].interestIndex;
/* We fetch the amount the borrower owes, with accumulated interest */
(vars.mathErr, vars.accountBorrows) = borrowBalanceStoredInternal(borrower);
if (vars.mathErr != MathError.NO_ERROR) {
return (failOpaque(Error.MATH_ERROR, FailureInfo.REPAY_BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED, uint(vars.mathErr)), 0);
}
/* If repayAmount == -1, repayAmount = accountBorrows */
if (repayAmount == uint(-1)) {
vars.repayAmount = vars.accountBorrows;
} else {
vars.repayAmount = repayAmount;
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
vars.actualRepayAmount = doTransferIn(eFILAddress, payer, vars.repayAmount);
/*
* We calculate the new borrower and total borrow balances, failing on underflow:
* accountBorrowsNew = accountBorrows - actualRepayAmount
* totalBorrowsNew = totalBorrows - actualRepayAmount
*/
(vars.mathErr, vars.accountBorrowsNew) = subUInt(vars.accountBorrows, vars.actualRepayAmount);
require(vars.mathErr == MathError.NO_ERROR, "REPAY_BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED");
(vars.mathErr, vars.totalBorrowsNew) = subUInt(totalBorrows, vars.actualRepayAmount);
require(vars.mathErr == MathError.NO_ERROR, "REPAY_BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED");
/* We write the previously calculated values into storage */
accountBorrows[borrower].principal = vars.accountBorrowsNew;
accountBorrows[borrower].interestIndex = borrowIndex;
totalBorrows = vars.totalBorrowsNew;
/* We emit a RepayBorrow event */
emit RepayBorrow(payer, borrower, vars.actualRepayAmount, vars.accountBorrowsNew, vars.totalBorrowsNew);
return (uint(Error.NO_ERROR), vars.actualRepayAmount);
}
/**
* redeem collaterals
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param redeemAmount The number of collateral to redeem into underlying
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeemCollateral(uint redeemAmount) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
// redeemCollateralFresh emits redeem-collaterals-specific logs on errors, so we don't need to
return redeemCollateralFresh(msg.sender, redeemAmount);
}
struct RedeemCollateralLocalVars {
Error err;
MathError mathErr;
uint redeemAmount;
uint accountBorrows;
uint accountCollateralsOld;
uint accountCollateralsNew;
uint totalCollateralsNew;
}
/**
* redeem collaterals
* @dev Assumes interest has already been accrued up to the current block
* @param redeemer The address of the account which is redeeming
* @param redeemAmount The number of collaterals to redeem into underlying
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeemCollateralFresh(address redeemer, uint redeemAmount) internal returns (uint) {
RedeemCollateralLocalVars memory vars;
(vars.mathErr, vars.accountBorrows) = borrowBalanceStoredInternal(redeemer);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_COLLATERAL_ACCUMULATED_BORROW_CALCULATION_FAILED, uint(vars.mathErr));
}
vars.accountCollateralsOld = accountCollaterals[redeemer];
if (redeemAmount == uint(-1)) {
vars.redeemAmount = vars.accountCollateralsOld >= vars.accountBorrows ? vars.accountCollateralsOld - vars.accountBorrows : 0;
} else {
vars.redeemAmount = redeemAmount;
}
(vars.mathErr, vars.accountCollateralsNew) = subUInt(accountCollaterals[redeemer], vars.redeemAmount);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_COLLATERAL_NEW_ACCOUNT_COLLATERAL_CALCULATION_FAILED, uint(vars.mathErr));
}
// Check collateral
if (vars.accountCollateralsNew < vars.accountBorrows) {
return fail(Error.INSUFFICIENT_COLLATERAL, FailureInfo.REDEEM_COLLATERAL_INSUFFICIENT_COLLATERAL);
}
(vars.mathErr, vars.totalCollateralsNew) = subUInt(totalCollaterals, vars.redeemAmount);
require(vars.mathErr == MathError.NO_ERROR, "REDEEM_COLLATERALS_NEW_TOTAL_COLLATERALS_CALCULATION_FAILED");
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
doTransferOut(mFILAddress, redeemer, vars.redeemAmount);
/* We write previously calculated values into storage */
totalCollaterals = vars.totalCollateralsNew;
accountCollaterals[redeemer] = vars.accountCollateralsNew;
/* We emit a RedeemCollateral event */
emit RedeemCollateral(redeemer, vars.redeemAmount);
return uint(Error.NO_ERROR);
}
/**
* liquidate borrow
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param borrower The borrower's address
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function liquidateBorrow(address borrower) external nonReentrant returns (uint) {
uint err = accrueInterest();
if (err != uint(Error.NO_ERROR)) {
return fail(Error(err), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// Keep the flywheel moving
accrueDFL();
return liquidateBorrowFresh(msg.sender, borrower);
}
struct LiquidateBorrowLocalVars {
Error err;
MathError mathErr;
uint accountBorrows;
uint accountCollaterals;
uint collateralRate;
uint totalBorrowsNew;
}
/**
* liquidate borrow
* @dev Assumes interest has already been accrued up to the current block
* @param liquidator The liquidator's address
* @param borrower The borrower's address
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function liquidateBorrowFresh(address liquidator, address borrower) internal returns (uint) {
// make things simple
if (accountCollaterals[liquidator] != 0 || accountTokens[liquidator] != 0) {
return fail(Error.REJECTION, FailureInfo.LIQUIDATE_BORROW_REJECTION);
}
LiquidateBorrowLocalVars memory vars;
(vars.mathErr, vars.collateralRate, vars.accountBorrows, vars.accountCollaterals) = collateralRateInternal(borrower);
if (vars.mathErr != MathError.NO_ERROR) {
return failOpaque(Error.MATH_ERROR, FailureInfo.LIQUIDATE_BORROW_COLLATERAL_RATE_CALCULATION_FAILED, uint(vars.mathErr));
}
if (vars.collateralRate < liquidateFactorMantissa) {
return fail(Error.REJECTION, FailureInfo.LIQUIDATE_BORROW_NOT_SATISFIED);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
require(doTransferIn(eFILAddress, liquidator, vars.accountBorrows) == vars.accountBorrows, "LIQUIDATE_BORROW_TRANSFER_IN_FAILED");
(vars.mathErr, vars.totalBorrowsNew) = subUInt(totalBorrows, vars.accountBorrows);
require(vars.mathErr == MathError.NO_ERROR, "LIQUIDATE_BORROW_NEW_TOTAL_BORROWS_CALCULATION_FAILED");
/* We write the previously calculated values into storage */
accountBorrows[borrower].principal = 0;
accountBorrows[borrower].interestIndex = borrowIndex;
totalBorrows = vars.totalBorrowsNew;
accountCollaterals[borrower] = 0;
accountCollaterals[liquidator] = vars.accountCollaterals;
/* We emit a RepayBorrow event */
emit LiquidateBorrow(liquidator, borrower, vars.accountBorrows, vars.accountCollaterals);
return uint(Error.NO_ERROR);
}
/*** DFL ***/
// accrue DFL
function accrueDFL() internal {
uint startBlockNumber = dflAccrualBlockNumber;
uint endBlockNumber = startBlockNumber;
uint currentBlockNumber = getBlockNumber();
while (endBlockNumber < currentBlockNumber) {
if (currentSpeed < minSpeed) {
break;
}
startBlockNumber = endBlockNumber;
if (currentBlockNumber < nextHalveBlockNumber) {
endBlockNumber = currentBlockNumber;
} else {
endBlockNumber = nextHalveBlockNumber;
}
distributeAndUpdateSupplyIndex(startBlockNumber, endBlockNumber);
if (endBlockNumber == nextHalveBlockNumber) {
nextHalveBlockNumber = nextHalveBlockNumber + halvePeriod;
currentSpeed = currentSpeed / 2;
}
}
// update dflAccrualBlockNumber
dflAccrualBlockNumber = currentBlockNumber;
}
// Accrue DFL for suppliers by updating the supply index
function distributeAndUpdateSupplyIndex(uint startBlockNumber, uint endBlockNumber) internal {
uint deltaBlocks = sub_(endBlockNumber, startBlockNumber);
if (deltaBlocks > 0) {
uint deltaDFLs = mul_(deltaBlocks, currentSpeed);
dflToken.mint(address(this), deltaDFLs);
uint uniswapPart = div_(mul_(uniswapPercentage, deltaDFLs), mantissaOne);
uint minerLeaguePart = div_(mul_(minerLeaguePercentage, deltaDFLs), mantissaOne);
uint operatorPart = div_(mul_(operatorPercentage, deltaDFLs), mantissaOne);
uint technicalPart = div_(mul_(technicalPercentage, deltaDFLs), mantissaOne);
uint supplyPart = sub_(sub_(sub_(sub_(deltaDFLs, uniswapPart), minerLeaguePart), operatorPart), technicalPart);
// accrue, not transfer directly
dflAccrued[uniswapAddress] = add_(dflAccrued[uniswapAddress], uniswapPart);
dflAccrued[minerLeagueAddress] = add_(dflAccrued[minerLeagueAddress], minerLeaguePart);
dflAccrued[operatorAddress] = add_(dflAccrued[operatorAddress], operatorPart);
dflAccrued[technicalAddress] = add_(dflAccrued[technicalAddress], technicalPart);
if (totalSupply > 0) {
Double memory ratio = fraction(supplyPart, totalSupply);
Double memory index = add_(Double({mantissa: dflSupplyIndex}), ratio);
dflSupplyIndex = index.mantissa;
} else {
dflAccrued[undistributedAddress] = add_(dflAccrued[undistributedAddress], supplyPart);
}
emit AccrueDFL(uniswapPart, minerLeaguePart, operatorPart, technicalPart, supplyPart, dflSupplyIndex);
}
}
// Calculate DFL accrued by a supplier and possibly transfer it to them
function distributeSupplierDFL(address supplier, bool distributeAll) internal {
/* Verify accrued block number equals current block number */
require(dflAccrualBlockNumber == getBlockNumber(), "FRESHNESS_CHECK");
uint supplierAccrued = accruedDFLStoredInternal(supplier);
dflAccrued[supplier] = transferDFL(supplier, supplierAccrued, distributeAll ? 0 : dflClaimThreshold);
dflSupplierIndex[supplier] = dflSupplyIndex;
emit DistributedDFL(supplier, supplierAccrued - dflAccrued[supplier]);
}
// Transfer DFL to the user, if they are above the threshold
function transferDFL(address user, uint userAccrued, uint threshold) internal returns (uint) {
if (userAccrued >= threshold && userAccrued > 0) {
uint dflRemaining = dflToken.balanceOf(address(this));
if (userAccrued <= dflRemaining) {
dflToken.transfer(user, userAccrued);
return 0;
}
}
return userAccrued;
}
function claimDFL() public nonReentrant {
accrueDFL();
distributeSupplierDFL(msg.sender, true);
}
// Claim all DFL accrued by the suppliers
function claimDFL(address[] memory holders) public nonReentrant {
accrueDFL();
for (uint i = 0; i < holders.length; i++) {
distributeSupplierDFL(holders[i], true);
}
}
// Reduce reserves, only by staking contract
function claimReserves() public nonReentrant {
require(accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed");
uint cash = getCashPrior();
uint actualAmount = cash > totalReserves ? totalReserves : cash;
doTransferOut(eFILAddress, reservesOwner, actualAmount);
totalReserves = sub_(totalReserves, actualAmount);
emit ReservesReduced(reservesOwner, actualAmount);
}
/*** Admin Functions ***/
/**
* @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
* @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
* @param newPendingAdmin New pending admin.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setPendingAdmin(address newPendingAdmin) external returns (uint) {
// Check caller = admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
// Save current value, if any, for inclusion in log
address oldPendingAdmin = pendingAdmin;
// Store pendingAdmin with value newPendingAdmin
pendingAdmin = newPendingAdmin;
// Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin);
return uint(Error.NO_ERROR);
}
/**
* @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin
* @dev Admin function for pending admin to accept role and update admin
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _acceptAdmin() external returns (uint) {
// Check caller is pendingAdmin and pendingAdmin ≠ address(0)
if (msg.sender != pendingAdmin || msg.sender == address(0)) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
// Save current values for inclusion in log
address oldAdmin = admin;
address oldPendingAdmin = pendingAdmin;
// Store admin with value pendingAdmin
admin = pendingAdmin;
// Clear the pending value
pendingAdmin = address(0);
emit NewAdmin(oldAdmin, admin);
emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);
return uint(Error.NO_ERROR);
}
/**
* @dev Change mintAllowed
* @param mintAllowed_ New value.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setMintAllowed(bool mintAllowed_) external returns (uint) {
// Check caller = admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
if (mintAllowed != mintAllowed_) {
mintAllowed = mintAllowed_;
emit MintAllowed(mintAllowed_);
}
return uint(Error.NO_ERROR);
}
/**
* @dev Change borrowAllowed
* @param borrowAllowed_ New value.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setBorrowAllowed(bool borrowAllowed_) external returns (uint) {
// Check caller = admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
if (borrowAllowed != borrowAllowed_) {
borrowAllowed = borrowAllowed_;
emit BorrowAllowed(borrowAllowed_);
}
return uint(Error.NO_ERROR);
}
/**
* @notice accrues interest and sets a new reserve factor for the protocol using _setReserveFactorFresh
* @dev Admin function to accrue interest and set a new reserve factor
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setReserveFactor(uint newReserveFactorMantissa) external nonReentrant returns (uint) {
uint error = accrueInterest();
if (error != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reserve factor change failed.
return fail(Error(error), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// _setReserveFactorFresh emits reserve-factor-specific logs on errors, so we don't need to.
return _setReserveFactorFresh(newReserveFactorMantissa);
}
/**
* @notice Sets a new reserve factor for the protocol (*requires fresh interest accrual)
* @dev Admin function to set a new reserve factor
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setReserveFactorFresh(uint newReserveFactorMantissa) internal returns (uint) {
// Check caller is admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
// Check newReserveFactor ≤ maxReserveFactor
if (newReserveFactorMantissa > reserveFactorMaxMantissa) {
return fail(Error.BAD_INPUT, FailureInfo.SET_RESERVE_FACTOR_BOUNDS_CHECK);
}
uint oldReserveFactorMantissa = reserveFactorMantissa;
reserveFactorMantissa = newReserveFactorMantissa;
emit NewReserveFactor(oldReserveFactorMantissa, newReserveFactorMantissa);
return uint(Error.NO_ERROR);
}
/**
* @notice accrues interest and sets a new liquidate factor for the protocol using _setLiquidateFactorFresh
* @dev Admin function to accrue interest and set a new liquidate factor
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setLiquidateFactor(uint newLiquidateFactorMantissa) external nonReentrant returns (uint) {
uint error = accrueInterest();
if (error != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted liquidate factor change failed.
return fail(Error(error), FailureInfo.ACCRUE_INTEREST_FAILED);
}
return _setLiquidateFactorFresh(newLiquidateFactorMantissa);
}
function _setLiquidateFactorFresh(uint newLiquidateFactorMantissa) internal returns (uint) {
// Check caller is admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
if (newLiquidateFactorMantissa < liquidateFactorMinMantissa) {
return fail(Error.BAD_INPUT, FailureInfo.SET_LIQUIDATE_FACTOR_BOUNDS_CHECK);
}
uint oldLiquidateFactorMantissa = liquidateFactorMantissa;
liquidateFactorMantissa = newLiquidateFactorMantissa;
emit NewLiquidateFactor(oldLiquidateFactorMantissa, newLiquidateFactorMantissa);
return uint(Error.NO_ERROR);
}
/**
* @notice accrues interest and updates the interest rate model using _setInterestRateModelFresh
* @dev Admin function to accrue interest and update the interest rate model
* @param newInterestRateModel the new interest rate model to use
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setInterestRateModel(InterestRateModel newInterestRateModel) public nonReentrant returns (uint) {
uint error = accrueInterest();
if (error != uint(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted change of interest rate model failed
return fail(Error(error), FailureInfo.ACCRUE_INTEREST_FAILED);
}
// _setInterestRateModelFresh emits interest-rate-model-update-specific logs on errors, so we don't need to.
return _setInterestRateModelFresh(newInterestRateModel);
}
/**
* @notice updates the interest rate model (*requires fresh interest accrual)
* @dev Admin function to update the interest rate model
* @param newInterestRateModel the new interest rate model to use
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setInterestRateModelFresh(InterestRateModel newInterestRateModel) internal returns (uint) {
// Used to store old model for use in the event that is emitted on success
InterestRateModel oldInterestRateModel;
// Check caller is admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
// Track the current interest rate model
oldInterestRateModel = interestRateModel;
// Ensure invoke newInterestRateModel.isInterestRateModel() returns true
require(newInterestRateModel.isInterestRateModel(), "marker method returned false");
// Set the interest rate model to newInterestRateModel
interestRateModel = newInterestRateModel;
// Emit NewInterestRateModel(oldInterestRateModel, newInterestRateModel)
emit NewInterestRateModel(oldInterestRateModel, newInterestRateModel);
return uint(Error.NO_ERROR);
}
/**
* @dev Change reservesOwner
* @param newReservesOwner New value.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setReservesOwner(address newReservesOwner) public returns (uint) {
claimReserves();
return _setReservesOwnerFresh(newReservesOwner);
}
function _setReservesOwnerFresh(address newReservesOwner) internal returns (uint) {
// Check caller = admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
address oldReservesOwner = reservesOwner;
reservesOwner = newReservesOwner;
emit ReservesOwnerChanged(oldReservesOwner, newReservesOwner);
return uint(Error.NO_ERROR);
}
/**
* @dev Change minerLeagueAddress
* @param newMinerLeagueAddress New value.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setMinerLeagueAddress(address newMinerLeagueAddress) external nonReentrant returns (uint) {
// accrue
accrueDFL();
return _setMinerLeagueAddressFresh(newMinerLeagueAddress);
}
function _setMinerLeagueAddressFresh(address newMinerLeagueAddress) internal returns (uint) {
if (msg.sender != minerLeagueAddress) {
return fail(Error.UNAUTHORIZED, FailureInfo.PARTICIPANT_CHECK);
}
// transfers accrued
if (dflAccrued[minerLeagueAddress] != 0) {
doTransferOut(address(dflToken), minerLeagueAddress, dflAccrued[minerLeagueAddress]);
delete dflAccrued[minerLeagueAddress];
}
address oldMinerLeagueAddress = minerLeagueAddress;
minerLeagueAddress = newMinerLeagueAddress;
emit MinerLeagueAddressChanged(oldMinerLeagueAddress, newMinerLeagueAddress);
return uint(Error.NO_ERROR);
}
/**
* @dev Change operatorAddress
* @param newOperatorAddress New value.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setOperatorAddress(address newOperatorAddress) external nonReentrant returns (uint) {
// accrue
accrueDFL();
return _setOperatorAddressFresh(newOperatorAddress);
}
function _setOperatorAddressFresh(address newOperatorAddress) internal returns (uint) {
if (msg.sender != operatorAddress) {
return fail(Error.UNAUTHORIZED, FailureInfo.PARTICIPANT_CHECK);
}
// transfers accrued
if (dflAccrued[operatorAddress] != 0) {
doTransferOut(address(dflToken), operatorAddress, dflAccrued[operatorAddress]);
delete dflAccrued[operatorAddress];
}
address oldOperatorAddress = operatorAddress;
operatorAddress = newOperatorAddress;
emit OperatorAddressChanged(oldOperatorAddress, newOperatorAddress);
return uint(Error.NO_ERROR);
}
/**
* @dev Change technicalAddress
* @param newTechnicalAddress New value.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setTechnicalAddress(address newTechnicalAddress) external nonReentrant returns (uint) {
// accrue
accrueDFL();
return _setTechnicalAddressFresh(newTechnicalAddress);
}
function _setTechnicalAddressFresh(address newTechnicalAddress) internal returns (uint) {
if (msg.sender != technicalAddress) {
return fail(Error.UNAUTHORIZED, FailureInfo.PARTICIPANT_CHECK);
}
// transfers accrued
if (dflAccrued[technicalAddress] != 0) {
doTransferOut(address(dflToken), technicalAddress, dflAccrued[technicalAddress]);
delete dflAccrued[technicalAddress];
}
address oldTechnicalAddress = technicalAddress;
technicalAddress = newTechnicalAddress;
emit TechnicalAddressChanged(oldTechnicalAddress, newTechnicalAddress);
return uint(Error.NO_ERROR);
}
/**
* @dev Change uniswapAddress
* @param newUniswapAddress New value.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setUniswapAddress(address newUniswapAddress) external nonReentrant returns (uint) {
// accrue
accrueDFL();
return _setUniswapAddressFresh(newUniswapAddress);
}
function _setUniswapAddressFresh(address newUniswapAddress) internal returns (uint) {
// Check caller = admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
// transfers accrued
if (dflAccrued[uniswapAddress] != 0) {
doTransferOut(address(dflToken), uniswapAddress, dflAccrued[uniswapAddress]);
delete dflAccrued[uniswapAddress];
}
address oldUniswapAddress = uniswapAddress;
uniswapAddress = newUniswapAddress;
emit UniswapAddressChanged(oldUniswapAddress, newUniswapAddress);
return uint(Error.NO_ERROR);
}
/**
* @dev Change undistributedAddress
* @param newUndistributedAddress New value.
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setUndistributedAddress(address newUndistributedAddress) external nonReentrant returns (uint) {
// accrue
accrueDFL();
return _setUndistributedAddressFresh(newUndistributedAddress);
}
function _setUndistributedAddressFresh(address newUndistributedAddress) internal returns (uint) {
// Check caller = admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
// transfers accrued to old address
if (dflAccrued[undistributedAddress] != 0) {
doTransferOut(address(dflToken), undistributedAddress, dflAccrued[undistributedAddress]);
delete dflAccrued[undistributedAddress];
}
address oldUndistributedAddress = undistributedAddress;
undistributedAddress = newUndistributedAddress;
emit UndistributedAddressChanged(oldUndistributedAddress, newUndistributedAddress);
return uint(Error.NO_ERROR);
}
/**
* @dev Change DFL percentages
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setDFLPercentages(uint uniswapPercentage_,
uint minerLeaguePercentage_,
uint operatorPercentage_) external nonReentrant returns (uint) {
accrueDFL();
return _setDFLPercentagesFresh(uniswapPercentage_, minerLeaguePercentage_, operatorPercentage_);
}
function _setDFLPercentagesFresh(uint uniswapPercentage_,
uint minerLeaguePercentage_,
uint operatorPercentage_) internal returns (uint) {
// Check caller = admin
if (msg.sender != admin) {
return fail(Error.UNAUTHORIZED, FailureInfo.ADMIN_CHECK);
}
uint sumPercentage = add_(add_(add_(uniswapPercentage_, minerLeaguePercentage_), operatorPercentage_), technicalPercentage);
require(sumPercentage <= mantissaOne, "PERCENTAGE_EXCEEDS");
uniswapPercentage = uniswapPercentage_;
minerLeaguePercentage = minerLeaguePercentage_;
operatorPercentage = operatorPercentage_;
emit PercentagesChanged(uniswapPercentage_, minerLeaguePercentage_, operatorPercentage_);
return uint(Error.NO_ERROR);
}
/*** Safe Token ***/
/**
* @notice Gets balance of this contract in terms of the underlying
* @dev This excludes the value of the current message, if any
* @return The quantity of underlying tokens owned by this contract
*/
function getCashPrior() internal view returns (uint) {
EIP20Interface token = EIP20Interface(eFILAddress);
return token.balanceOf(address(this));
}
/**
* @dev Similar to EIP20 transfer, except it handles a False result from `transferFrom` and reverts in that case.
* This will revert due to insufficient balance or insufficient allowance.
* This function returns the actual amount received,
* which may be less than `amount` if there is a fee attached to the transfer.
*
* Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.
* See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
*/
function doTransferIn(address underlying, address from, uint amount) internal returns (uint) {
EIP20NonStandardInterface token = EIP20NonStandardInterface(underlying);
uint balanceBefore = EIP20Interface(underlying).balanceOf(address(this));
token.transferFrom(from, address(this), amount);
bool success;
assembly {
switch returndatasize()
case 0 { // This is a non-standard ERC-20
success := not(0) // set success to true
}
case 32 { // This is a compliant ERC-20
returndatacopy(0, 0, 32)
success := mload(0) // Set `success = returndata` of external call
}
default { // This is an excessively non-compliant ERC-20, revert.
revert(0, 0)
}
}
require(success, "TOKEN_TRANSFER_IN_FAILED");
// Calculate the amount that was *actually* transferred
uint balanceAfter = EIP20Interface(underlying).balanceOf(address(this));
require(balanceAfter >= balanceBefore, "TOKEN_TRANSFER_IN_OVERFLOW");
return balanceAfter - balanceBefore; // underflow already checked above, just subtract
}
/**
* @dev Similar to EIP20 transfer, except it handles a False success from `transfer` and returns an explanatory
* error code rather than reverting. If caller has not called checked protocol's balance, this may revert due to
* insufficient cash held in this contract. If caller has checked protocol's balance prior to this call, and verified
* it is >= amount, this should not revert in normal conditions.
*
* Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.
* See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
*/
function doTransferOut(address underlying, address to, uint amount) internal {
EIP20NonStandardInterface token = EIP20NonStandardInterface(underlying);
token.transfer(to, amount);
bool success;
assembly {
switch returndatasize()
case 0 { // This is a non-standard ERC-20
success := not(0) // set success to true
}
case 32 { // This is a complaint ERC-20
returndatacopy(0, 0, 32)
success := mload(0) // Set `success = returndata` of external call
}
default { // This is an excessively non-compliant ERC-20, revert.
revert(0, 0)
}
}
require(success, "TOKEN_TRANSFER_OUT_FAILED");
}
}
// File: contracts\StakingDFL.sol
pragma solidity ^0.5.16;
contract StakingDFL is ReentrancyGuard, Exponential {
using SafeMath for uint;
/**
* @notice Address of DeFIL contract
*/
address public deFILAddress;
/**
* @notice Address of DFL
*/
address public dflAddress;
/**
* @notice Address of eFIL
*/
address public eFILAddress;
/**
* @notice Administrator for this contract
*/
address public admin;
/**
* @notice Pending administrator for this contract
*/
address public pendingAdmin;
// Minimum bonus amount per share
uint public minBonusAmount;
// Reserved part that stands for already shared bonus.
uint public sharedBonusAmount;
// Total number of deposits.
uint public totalDeposits;
// Mapping of account to outstanding deposit balances
mapping (address => uint) public accountDeposits;
// The initial accrual index
uint public constant initialAccruedIndex = 1e36;
// The last accrued index
uint public accruedIndex;
// The index for each account as of the last time they accrued
mapping(address => uint) public accountAccruedIndex;
/*** Events ***/
// Event emitted when new Staking tokens is deposited
event Deposit(address account, uint amount);
// Event emitted when new Staking tokens is withdrawed
event Withdraw(address account, uint amount);
// Emitted when bonus is accrued
event Bonus(uint amount, uint accruedIndex);
// Emitted when bonus is distributed to a participant
event Distributed(address account, uint amount);
// Event emitted when pendingAdmin is changed
event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);
// Event emitted when pendingAdmin is accepted, which means admin is updated
event NewAdmin(address oldAdmin, address newAdmin);
constructor(address dflAddress_,
address eFILAddress_,
uint minBonusAmount_) public {
// set admin
admin = msg.sender;
dflAddress = dflAddress_;
eFILAddress = eFILAddress_;
minBonusAmount = minBonusAmount_;
// init accrued index
accruedIndex = initialAccruedIndex;
}
function accrueBonus() public {
DeFIL deFIL = DeFIL(deFILAddress);
deFIL.claimReserves();
if (totalDeposits == 0) {
return;
}
EIP20Interface bonusToken = EIP20Interface(eFILAddress);
uint thisBalance = bonusToken.balanceOf(address(this));
uint avaiableBalance = thisBalance.sub(sharedBonusAmount);
if (avaiableBalance < minBonusAmount) {
return;
}
Double memory ratio = fraction(avaiableBalance, totalDeposits);
Double memory doubleAccruedIndex = add_(Double({mantissa: accruedIndex}), ratio);
// update accruedIndex
accruedIndex = doubleAccruedIndex.mantissa;
sharedBonusAmount = sharedBonusAmount.add(avaiableBalance);
emit Bonus(avaiableBalance, doubleAccruedIndex.mantissa);
}
// Accrue bonus and return the accrued bonus of account
function accruedBonusCurrent() external nonReentrant returns(uint) {
accrueBonus();
return accruedBonusStoredInternal(msg.sender);
}
// Return the accrued bonus of account based on stored data
function accruedBonusStored() public view returns(uint) {
return accruedBonusStoredInternal(msg.sender);
}
// Return the accrued bonus of account based on stored data
function accruedBonusStoredInternal(address account) public view returns(uint) {
Double memory doubleAccruedIndex = Double({mantissa: accruedIndex});
Double memory doubleAccountIndex = Double({mantissa: accountAccruedIndex[account]});
if (doubleAccountIndex.mantissa == 0 && doubleAccruedIndex.mantissa > 0) {
doubleAccountIndex.mantissa = initialAccruedIndex;
}
Double memory deltaIndex = sub_(doubleAccruedIndex, doubleAccountIndex);
uint accountDelta = mul_(accountDeposits[account], deltaIndex);
return accountDelta;
}
function claim(address[] memory accounts) public nonReentrant {
accrueBonus();
for (uint i = 0; i < accounts.length; i++) {
distributeBonus(accounts[i]);
}
}
function distributeBonus(address account) internal {
uint accountDelta = accruedBonusStoredInternal(account);
// transfer bonus token to account
doTransferOut(eFILAddress, account, accountDelta);
accountAccruedIndex[account] = accruedIndex;
sharedBonusAmount = sharedBonusAmount.sub(accountDelta);
emit Distributed(account, accountDelta);
}
// Deposit Staking tokens
function deposit(uint amount) external nonReentrant {
address account = msg.sender;
// accrue & distribute
accrueBonus();
distributeBonus(account);
// transfer staking token in
uint actualAmount = doTransferIn(dflAddress, account, amount);
// increase total deposits
totalDeposits = totalDeposits.add(actualAmount);
accountDeposits[account] = accountDeposits[account].add(actualAmount);
emit Deposit(account, actualAmount);
}
// Withdraw staking tokens
function withdraw(uint amount) external nonReentrant {
address account = msg.sender;
require(accountDeposits[account] >= amount, "withdraw: insufficient value");
// accrue & distribute
accrueBonus();
distributeBonus(account);
// transfer staking tokens back to account
doTransferOut(dflAddress, account, amount);
// decrease total deposits
totalDeposits = totalDeposits.sub(amount);
accountDeposits[account] = accountDeposits[account].sub(amount);
emit Withdraw(account, amount);
}
/*** Admin Functions ***/
/**
* @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
* @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
* @param newPendingAdmin New pending admin.
*/
function _setPendingAdmin(address newPendingAdmin) external {
require(msg.sender == admin, "Not admin");
require(newPendingAdmin != address(0), "Bad pending admin");
// Save current value, if any, for inclusion in log
address oldPendingAdmin = pendingAdmin;
// Store pendingAdmin with value newPendingAdmin
pendingAdmin = newPendingAdmin;
// Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin);
}
/**
* @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin
* @dev Admin function for pending admin to accept role and update admin
*/
function _acceptAdmin() external {
// Check caller is pendingAdmin
require(msg.sender == pendingAdmin && msg.sender != address(0), "Not pending admin");
// Save current values for inclusion in log
address oldAdmin = admin;
address oldPendingAdmin = pendingAdmin;
// Store admin with value pendingAdmin
admin = pendingAdmin;
// Clear the pending value
pendingAdmin = address(0);
emit NewAdmin(oldAdmin, admin);
emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);
}
/**
* @dev set DeFIL address
* @param deFILAddress_ New value.
*/
function _setDeFILAddress(address deFILAddress_) external {
require(deFILAddress == address(0), "Can noly set once");
require(msg.sender == admin, "Not admin");
deFILAddress = deFILAddress_;
}
/**
* @dev Change minBonusAmount
* @param minBonusAmount_ New value.
*/
function _setMinBonusAmount(uint minBonusAmount_) external {
require(msg.sender == admin, "Not admin");
accrueBonus();
minBonusAmount = minBonusAmount_;
}
/*** Safe Token ***/
/**
* @dev Similar to EIP20 transfer, except it handles a False result from `transferFrom` and reverts in that case.
* This will revert due to insufficient balance or insufficient allowance.
* This function returns the actual amount received,
* which may be less than `amount` if there is a fee attached to the transfer.
*
* Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.
* See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
*/
function doTransferIn(address underlying, address from, uint amount) internal returns (uint) {
EIP20NonStandardInterface token = EIP20NonStandardInterface(underlying);
uint balanceBefore = EIP20Interface(underlying).balanceOf(address(this));
token.transferFrom(from, address(this), amount);
bool success;
assembly {
switch returndatasize()
case 0 { // This is a non-standard ERC-20
success := not(0) // set success to true
}
case 32 { // This is a compliant ERC-20
returndatacopy(0, 0, 32)
success := mload(0) // Set `success = returndata` of external call
}
default { // This is an excessively non-compliant ERC-20, revert.
revert(0, 0)
}
}
require(success, "TOKEN_TRANSFER_IN_FAILED");
// Calculate the amount that was *actually* transferred
uint balanceAfter = EIP20Interface(underlying).balanceOf(address(this));
require(balanceAfter >= balanceBefore, "TOKEN_TRANSFER_IN_OVERFLOW");
return balanceAfter - balanceBefore; // underflow already checked above, just subtract
}
/**
* @dev Similar to EIP20 transfer, except it handles a False success from `transfer` and returns an explanatory
* error code rather than reverting. If caller has not called checked protocol's balance, this may revert due to
* insufficient cash held in this contract. If caller has checked protocol's balance prior to this call, and verified
* it is >= amount, this should not revert in normal conditions.
*
* Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.
* See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
*/
function doTransferOut(address underlying, address to, uint amount) internal {
EIP20NonStandardInterface token = EIP20NonStandardInterface(underlying);
token.transfer(to, amount);
bool success;
assembly {
switch returndatasize()
case 0 { // This is a non-standard ERC-20
success := not(0) // set success to true
}
case 32 { // This is a complaint ERC-20
returndatacopy(0, 0, 32)
success := mload(0) // Set `success = returndata` of external call
}
default { // This is an excessively non-compliant ERC-20, revert.
revert(0, 0)
}
}
require(success, "TOKEN_TRANSFER_OUT_FAILED");
}
}Contract Security Audit
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[{"inputs":[{"internalType":"address","name":"dflAddress_","type":"address"},{"internalType":"address","name":"eFILAddress_","type":"address"},{"internalType":"uint256","name":"minBonusAmount_","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"accruedIndex","type":"uint256"}],"name":"Bonus","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Distributed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"newAdmin","type":"address"}],"name":"NewAdmin","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldPendingAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"newPendingAdmin","type":"address"}],"name":"NewPendingAdmin","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"constant":false,"inputs":[],"name":"_acceptAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"deFILAddress_","type":"address"}],"name":"_setDeFILAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"minBonusAmount_","type":"uint256"}],"name":"_setMinBonusAmount","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newPendingAdmin","type":"address"}],"name":"_setPendingAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"accountAccruedIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"accountDeposits","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"accrueBonus","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"accruedBonusCurrent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"accruedBonusStored","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"accruedBonusStoredInternal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"accruedIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"admin","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address[]","name":"accounts","type":"address[]"}],"name":"claim","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"deFILAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deposit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"dflAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"eFILAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"initialAccruedIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"minBonusAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"pendingAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"sharedBonusAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalDeposits","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000006ded0f2c886568fb4bb6f04f179093d3d167c9d700000000000000000000000022b475f3e93390b7e523873ad7073337f4e56c2c000000000000000000000000000000000000000000000000016345785d8a0000
-----Decoded View---------------
Arg [0] : dflAddress_ (address): 0x6ded0F2c886568Fb4Bb6F04f179093D3D167c9D7
Arg [1] : eFILAddress_ (address): 0x22B475f3e93390b7E523873ad7073337f4E56C2c
Arg [2] : minBonusAmount_ (uint256): 100000000000000000
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000006ded0f2c886568fb4bb6f04f179093d3d167c9d7
Arg [1] : 00000000000000000000000022b475f3e93390b7e523873ad7073337f4e56c2c
Arg [2] : 000000000000000000000000000000000000000000000000016345785d8a0000
Deployed Bytecode Sourcemap
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Swarm Source
bzzr://587b23b55fdf7f57e82f8b3a884a8d9bab74f5fa71c52fa54d1830ba8c0874ac
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Multichain Portfolio | 30 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
|---|
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.