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Contract Name:
KErc20
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 1 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "./abstract/KToken.sol";
import "./abstract/KErc20Storage.sol";
/**
* @title KEOM's KErc20 Contract
* @notice KTokens which wrap an EIP-20 underlying
* @author KEOM
*/
contract KErc20 is KToken, KErc20Storage {
/**
* @notice Initialize the new money market
* @param underlying_ The address of the underlying asset
* @param comptroller_ The address of the Comptroller
* @param interestRateModel_ The address of the interest rate model
* @param initialExchangeRateMantissa_ The initial exchange rate, scaled by 1e18
* @param name_ ERC-20 name of this token
* @param symbol_ ERC-20 symbol of this token
* @param decimals_ ERC-20 decimal precision of this token
* @param admin_ Address of the administrator of this token
*/
function initialize(
address underlying_,
IComptroller comptroller_,
IInterestRateModel interestRateModel_,
uint256 initialExchangeRateMantissa_,
string memory name_,
string memory symbol_,
uint8 decimals_,
address payable admin_
) external initializer {
admin = payable(msg.sender);
super.initialize(
comptroller_,
interestRateModel_,
initialExchangeRateMantissa_,
name_,
symbol_,
decimals_
);
// Set underlying and sanity check it
underlying = underlying_;
IEIP20(underlying).totalSupply();
// Set the proper admin now that initialization is done
admin = admin_;
}
/*** User Interface ***/
/**
* @notice Sender supplies assets into the market and receives kTokens in exchange
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param mintAmount The amount of the underlying asset to supply
* @dev Reverts upon any failure
*/
function mint(uint256 mintAmount) external override {
(uint256 err, ) = mintInternal(mintAmount);
requireNoError(err, "mint failed");
}
/**
* @notice Sender redeems kTokens in exchange for the underlying asset
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param redeemTokens The number of kTokens to redeem into underlying
*/
function redeem(uint256 redeemTokens) external override {
redeemInternal(redeemTokens);
}
/**
* @notice Sender redeems kTokens 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
*/
function redeemUnderlying(uint256 redeemAmount) external override{
redeemUnderlyingInternal(redeemAmount);
}
/**
* @notice Sender borrows assets from the protocol to their own address
* @param borrowAmount The amount of the underlying asset to borrow
*/
function borrow(uint256 borrowAmount) external override {
borrowInternal(borrowAmount);
}
/**
* @notice Sender repays their own borrow
* @param repayAmount The amount to repay
* @dev Reverts upon any failure
*/
function repayBorrow(uint256 repayAmount) external override {
(uint256 err, ) = repayBorrowInternal(repayAmount);
requireNoError(err, "repayBorrow failed");
}
/**
* @notice Sender repays a borrow belonging to borrower
* @param borrower the account with the debt being payed off
* @param repayAmount The amount to repay
* @dev Reverts upon any failure
*/
function repayBorrowBehalf(address borrower, uint256 repayAmount)
external override
{
(uint256 err, ) = repayBorrowBehalfInternal(borrower, repayAmount);
requireNoError(err, "repayBorrowBehalf failed");
}
/**
* @notice The sender liquidates the borrowers collateral.
* The collateral seized is transferred to the liquidator.
* @param borrower The borrower of this kToken to be liquidated
* @param repayAmount The amount of the underlying borrowed asset to repay
* @param kTokenCollateral The market in which to seize collateral from the borrower
* @dev Reverts upon any failure
*/
function liquidateBorrow(
address borrower,
uint256 repayAmount,
IKToken kTokenCollateral
) external override {
(uint256 err, ) = liquidateBorrowInternal(
borrower,
repayAmount,
kTokenCollateral
);
requireNoError(err, "liquidateBorrow failed");
}
/**
* @notice The sender liquidates the borrowers collateral and updates prices at Pyth's oracle.
* The collateral seized is transferred to the liquidator.
* @param borrower The borrower of this kToken to be liquidated
* @param repayAmount The amount of the underlying borrowed asset to repay
* @param kTokenCollateral The market in which to seize collateral from the borrower
* @param priceUpdateData data for updating prices on Pyth smart contract
* @dev Reverts upon any failure
*/
function liquidateBorrowWithPriceUpdate(
address borrower,
uint256 repayAmount,
IKToken kTokenCollateral,
bytes[] calldata priceUpdateData
) external {
comptroller.updatePrices(priceUpdateData);
(uint256 err, ) = liquidateBorrowInternal(
borrower,
repayAmount,
kTokenCollateral
);
requireNoError(err, "liquidateBorrow failed");
}
/**
* @notice The sender adds to reserves.
* @param addAmount The amount fo underlying token to add as reserves
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _addReserves(uint256 addAmount) external override returns (uint256) {
return _addReservesInternal(addAmount);
}
/*** 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 override view returns (uint256) {
IEIP20 token = IEIP20(underlying);
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 from, uint256 amount)
internal override
returns (uint256)
{
IEIP20NonStandard token = IEIP20NonStandard(underlying);
uint256 balanceBefore = IEIP20(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
uint256 balanceAfter = IEIP20(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 payable to, uint256 amount) internal override virtual {
IEIP20NonStandard token = IEIP20NonStandard(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");
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/utils/Initializable.sol)
pragma solidity ^0.8.0;
import "../../utils/Address.sol";
/**
* @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
* behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
* external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
* function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
*
* TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
* possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
*
* CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
* that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
*
* [CAUTION]
* ====
* Avoid leaving a contract uninitialized.
*
* An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
* contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
* initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
*
* [.hljs-theme-light.nopadding]
* ```
* /// @custom:oz-upgrades-unsafe-allow constructor
* constructor() initializer {}
* ```
* ====
*/
abstract contract Initializable {
/**
* @dev Indicates that the contract has been initialized.
*/
bool private _initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private _initializing;
/**
* @dev Modifier to protect an initializer function from being invoked twice.
*/
modifier initializer() {
// If the contract is initializing we ignore whether _initialized is set in order to support multiple
// inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
// contract may have been reentered.
require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");
bool isTopLevelCall = !_initializing;
if (isTopLevelCall) {
_initializing = true;
_initialized = true;
}
_;
if (isTopLevelCall) {
_initializing = false;
}
}
/**
* @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
* {initializer} modifier, directly or indirectly.
*/
modifier onlyInitializing() {
require(_initializing, "Initializable: contract is not initializing");
_;
}
function _isConstructor() private view returns (bool) {
return !Address.isContract(address(this));
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
/**
* @title KEOM's IInterestRateModel Interface
* @author KEOM
*/
interface IInterestRateModel {
/// @notice Indicator that this is an InterestRateModel contract (for inspection)
function isInterestRateModel() external view returns(bool);
/**
* @notice Calculates the current borrow interest rate per timestmp
* @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 amount of reserves the market has
* @return The borrow rate per timestmp (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 timestmp
* @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 amount of reserves the market has
* @param reserveFactorMantissa The current reserve factor the market has
* @return The supply rate per timestmp (as a percentage, and scaled by 1e18)
*/
function getSupplyRate(uint cash, uint borrows, uint reserves, uint reserveFactorMantissa) external view returns (uint);
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "../ktokens/interfaces/IKToken.sol";
import "../oracles/PriceOracle.sol";
interface IComptroller {
/// @notice Indicator that this is a Comptroller contract (for inspection)
function isComptroller() external view returns(bool);
/*** Assets You Are In ***/
function enterMarkets(address[] calldata kTokens) external returns (uint[] memory);
function exitMarket(address kToken) external returns (uint);
/*** Policy Hooks ***/
function mintAllowed(address kToken, address minter, uint mintAmount) external returns (uint);
function redeemAllowed(address kToken, address redeemer, uint redeemTokens) external returns (uint);
function redeemVerify(address kToken, address redeemer, uint redeemAmount, uint redeemTokens) external;
function borrowAllowed(address kToken, address borrower, uint borrowAmount) external returns (uint);
function repayBorrowAllowed(
address kToken,
address payer,
address borrower,
uint repayAmount) external returns (uint);
function liquidateBorrowAllowed(
address kTokenBorrowed,
address kTokenCollateral,
address liquidator,
address borrower,
uint repayAmount) external returns (uint, uint);
function seizeAllowed(
address kTokenCollateral,
address kTokenBorrowed,
address liquidator,
address borrower,
uint seizeTokens) external returns (uint);
function transferAllowed(address kToken, address src, address dst, uint transferTokens) external returns (uint);
/*** Liquidity/Liquidation Calculations ***/
function liquidateCalculateSeizeTokens(
address kTokenBorrowed,
address kTokenCollateral,
uint repayAmount,
uint dynamicLiquidationIncentive) external view returns (uint, uint);
function isMarket(address market) external view returns(bool);
function getAllMarkets() external view returns(IKToken[] memory);
function oracle() external view returns(PriceOracle);
function updatePrices(bytes[] calldata priceUpdateData) external;
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "../interfaces/IKErc20.sol";
abstract contract KErc20Storage is IKErc20 {
/**
* @notice Underlying asset for this KToken
*/
address public override underlying;
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "./KTokenStorage.sol";
import "../../interfaces/IComptroller.sol";
import "../../libraries/ErrorReporter.sol";
import "../../libraries/Exponential.sol";
import "../interfaces/IEIP20.sol";
import "../../interest-rate-models/interfaces/IInterestRateModel.sol";
import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
/**
* @title KEOM's KToken Contract
* @notice Abstract base for KTokens
* @author KEOM
*/
abstract contract KToken is KTokenStorage, Exponential, TokenErrorReporter, Initializable {
/**
* @notice Initialize the money market
* @param comptroller_ The address of the Comptroller
* @param interestRateModel_ The address of the interest rate model
* @param initialExchangeRateMantissa_ The initial exchange rate, scaled by 1e18
* @param name_ EIP-20 name of this token
* @param symbol_ EIP-20 symbol of this token
* @param decimals_ EIP-20 decimal precision of this token
*/
function initialize(
IComptroller comptroller_,
IInterestRateModel interestRateModel_,
uint256 initialExchangeRateMantissa_,
string memory name_,
string memory symbol_,
uint8 decimals_
) internal {
require(msg.sender == admin, "only admin may initialize");
require(
accrualBlockTimestamp == 0 && borrowIndex == 0,
"already initialized"
);
// Set initial exchange rate
initialExchangeRateMantissa = initialExchangeRateMantissa_;
require(
initialExchangeRateMantissa > 0,
"init exchange rate must be > 0"
);
// Set the comptroller
require(
_setComptroller(comptroller_) == uint256(Error.NO_ERROR),
"set comptroller failed"
);
// Initialize block timestamp and borrow index (block timestamp mocks depend on comptroller being set)
accrualBlockTimestamp = getBlockTimestamp();
borrowIndex = mantissaOne;
// Set the interest rate model (depends on block timestamp / borrow index)
require(
_setInterestRateModelFresh(interestRateModel_) ==
uint256(Error.NO_ERROR),
"set interest rate model failed"
);
name = name_;
symbol = symbol_;
decimals = decimals_;
// The counter starts true to prevent changing it from zero to non-zero (i.e. smaller cost/refund)
_notEntered = true;
}
/**
* @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,
uint256 tokens
) internal returns (uint256) {
/* Fail if transfer not allowed */
uint256 allowed = comptroller.transferAllowed(
address(this),
src,
dst,
tokens
);
require(allowed == 0, "ERC20: transfer not allowed");
/* Do not allow self-transfers */
require(src != dst, "ERC20: self-transfer not allowed");
/* Get the allowance, infinite for the account owner */
uint256 startingAllowance = 0;
if (spender == src) {
startingAllowance = type(uint256).max;
} else {
startingAllowance = transferAllowances[src][spender];
}
/* Do the calculations, checking for {under,over}flow */
MathError mathErr;
uint256 allowanceNew;
uint256 srkTokensNew;
uint256 dstTokensNew;
(mathErr, allowanceNew) = subUInt(startingAllowance, tokens);
require(
mathErr == MathError.NO_ERROR,
"ERC20: decreased allowance below zero"
);
(mathErr, srkTokensNew) = subUInt(accountTokens[src], tokens);
require(
mathErr == MathError.NO_ERROR,
"ERC20: transfer amount exceeds balance"
);
(mathErr, dstTokensNew) = addUInt(accountTokens[dst], tokens);
require(
mathErr == MathError.NO_ERROR,
"ERC20: maximum destination balance reached"
);
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
accountTokens[src] = srkTokensNew;
accountTokens[dst] = dstTokensNew;
/* Eat some of the allowance (if necessary) */
if (startingAllowance != type(uint256).max) {
transferAllowances[src][spender] = allowanceNew;
}
/* We emit a Transfer event */
emit Transfer(src, dst, tokens);
// unused function
// comptroller.transferVerify(address(this), src, dst, tokens);
return uint256(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
override
nonReentrant
returns (bool)
{
return
transferTokens(msg.sender, msg.sender, dst, amount) ==
uint256(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 override nonReentrant returns (bool) {
return
transferTokens(msg.sender, src, dst, amount) ==
uint256(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
override
returns (bool)
{
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
override
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 override 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
override
returns (uint256)
{
Exp memory exchangeRate = Exp({mantissa: exchangeRateCurrent()});
(MathError mErr, uint256 balance) = mulScalarTruncate(
exchangeRate,
accountTokens[owner]
);
require(mErr == MathError.NO_ERROR, "balance could not be calculated");
return balance;
}
/**
* @notice Get a snapshot of the account's balances, and the cached exchange rate
* @dev This is used by comptroller to more efficiently perform liquidity checks.
* @param account Address of the account to snapshot
* @return (possible error, token balance, borrow balance, exchange rate mantissa)
*/
function getAccountSnapshot(address account)
external
view
override
returns (
uint256,
uint256,
uint256,
uint256
)
{
uint256 kTokenBalance = accountTokens[account];
uint256 borrowBalance;
uint256 exchangeRateMantissa;
MathError mErr;
(mErr, borrowBalance) = borrowBalanceStoredInternal(account);
if (mErr != MathError.NO_ERROR) {
return (uint256(Error.MATH_ERROR), 0, 0, 0);
}
(mErr, exchangeRateMantissa) = exchangeRateStoredInternal();
if (mErr != MathError.NO_ERROR) {
return (uint256(Error.MATH_ERROR), 0, 0, 0);
}
return (
uint256(Error.NO_ERROR),
kTokenBalance,
borrowBalance,
exchangeRateMantissa
);
}
/**
* @dev Function to simply retrieve block timestamp
* This exists mainly for inheriting test contracts to stub this result.
*/
function getBlockTimestamp() internal view virtual returns (uint256) {
return block.timestamp;
}
/**
* @notice Returns the current per-timestamp borrow interest rate for this kToken
* @return The borrow interest rate per timestmp, scaled by 1e18
*/
function borrowRatePerTimestamp() external view override returns (uint256) {
return
interestRateModel.getBorrowRate(
getCashPrior(),
totalBorrows,
totalReserves
);
}
/**
* @notice Returns the current per-timestamp supply interest rate for this kToken
* @return The supply interest rate per timestmp, scaled by 1e18
*/
function supplyRatePerTimestamp() external view override returns (uint256) {
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
override
nonReentrant
returns (uint256)
{
require(
accrueInterest() == uint256(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
override
nonReentrant
returns (uint256)
{
require(
accrueInterest() == uint256(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
override
returns (uint256)
{
(MathError err, uint256 result) = borrowBalanceStoredInternal(account);
require(err == MathError.NO_ERROR, "borrowBalanceStored 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, uint256)
{
/* Note: we do not assert that the market is up to date */
MathError mathErr;
uint256 principalTimesIndex;
uint256 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 * market.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
override
nonReentrant
returns (uint256)
{
require(
accrueInterest() == uint256(Error.NO_ERROR),
"accrue interest failed"
);
return exchangeRateStored();
}
/**
* @notice Calculates the exchange rate from the underlying to the KToken
* @dev This function does not accrue interest before calculating the exchange rate
* @return Calculated exchange rate scaled by 1e18
*/
function exchangeRateStored() public view override returns (uint256) {
(MathError err, uint256 result) = exchangeRateStoredInternal();
require(err == MathError.NO_ERROR, "exchangeRateStored failed");
return result;
}
/**
* @notice Calculates the exchange rate from the underlying to the KToken
* @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
virtual
returns (MathError, uint256)
{
uint256 _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
*/
uint256 totalCash = getCashPrior();
uint256 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 Get cash balance of this kToken in the underlying asset
* @return The quantity of underlying asset owned by this contract
*/
function getCash() external view override returns (uint256) {
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 override returns (uint256) {
/* Remember the initial block timestamp */
uint256 currentBlockTimestamp = getBlockTimestamp();
uint256 accrualBlockTimestampPrior = accrualBlockTimestamp;
/* Short-circuit accumulating 0 interest */
if (accrualBlockTimestampPrior == currentBlockTimestamp) {
return uint256(Error.NO_ERROR);
}
/* Read the previous values out of storage */
uint256 cashPrior = getCashPrior();
uint256 borrowsPrior = totalBorrows;
uint256 reservesPrior = totalReserves;
uint256 borrowIndexPrior = borrowIndex;
/* Calculate the current borrow interest rate */
uint256 borrowRateMantissa = interestRateModel.getBorrowRate(
cashPrior,
borrowsPrior,
reservesPrior
);
require(
borrowRateMantissa <= borrowRateMaxMantissa,
"borrow rate is absurdly high"
);
/* Calculate the number of blocks elapsed since the last accrual */
(MathError mathErr, uint256 blockDelta) = subUInt(
currentBlockTimestamp,
accrualBlockTimestampPrior
);
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;
uint256 interestAccumulated;
uint256 totalBorrowsNew;
uint256 totalReservesNew;
uint256 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,
uint256(mathErr)
);
}
(mathErr, interestAccumulated) = mulScalarTruncate(
simpleInterestFactor,
borrowsPrior
);
if (mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo
.ACCRUE_INTEREST_ACCUMULATED_INTEREST_CALCULATION_FAILED,
uint256(mathErr)
);
}
(mathErr, totalBorrowsNew) = addUInt(interestAccumulated, borrowsPrior);
if (mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo
.ACCRUE_INTEREST_NEW_TOTAL_BORROWS_CALCULATION_FAILED,
uint256(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,
uint256(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,
uint256(mathErr)
);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
/* We write the previously calculated values into storage */
accrualBlockTimestamp = currentBlockTimestamp;
borrowIndex = borrowIndexNew;
totalBorrows = totalBorrowsNew;
totalReserves = totalReservesNew;
/* We emit an AccrueInterest event */
emit AccrueInterest(
cashPrior,
interestAccumulated,
borrowIndexNew,
totalBorrowsNew
);
return uint256(Error.NO_ERROR);
}
/**
* @notice Sender supplies assets into the market and receives kTokens 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, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual mint amount.
*/
function mintInternal(uint256 mintAmount)
internal
nonReentrant
returns (uint256, uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return (
fail(Error(error), FailureInfo.MINT_ACCRUE_INTEREST_FAILED),
0
);
}
// mintFresh emits the actual Mint event if successful and logs on errors, so we don't need to
return mintFresh(msg.sender, mintAmount);
}
struct MintLocalVars {
Error err;
MathError mathErr;
}
/**
* @notice User supplies assets into the market and receives kTokens 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, uint256 mintAmount)
internal
returns (uint256, uint256)
{
/* Fail if mint not allowed */
{
uint256 allowed = comptroller.mintAllowed(
address(this),
minter,
mintAmount
);
if (allowed != 0) {
return (
failOpaque(
Error.COMPTROLLER_REJECTION,
FailureInfo.MINT_COMPTROLLER_REJECTION,
allowed
),
0
);
}
}
/* Verify market's block timestamp equals current block timestamp */
if (accrualBlockTimestamp != getBlockTimestamp()) {
return (
fail(Error.MARKET_NOT_FRESH, FailureInfo.MINT_FRESHNESS_CHECK),
0
);
}
MintLocalVars memory vars;
uint256 exchangeRateMantissa;
(vars.mathErr, exchangeRateMantissa) = exchangeRateStoredInternal();
if (vars.mathErr != MathError.NO_ERROR) {
return (
failOpaque(
Error.MATH_ERROR,
FailureInfo.MINT_EXCHANGE_RATE_READ_FAILED,
uint256(vars.mathErr)
),
0
);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
/*
* We call `doTransferIn` for the minter and the mintAmount.
* Note: The kToken must handle variations between ERC-20 and NATIVE underlying.
* `doTransferIn` reverts if anything goes wrong, since we can't be sure if
* side-effects occurred. The function returns the amount actually transferred,
* in case of a fee. On success, the kToken holds an additional `actualMintAmount`
* of cash.
*/
uint256 actualMintAmount = doTransferIn(minter, mintAmount);
/*
* We get the current exchange rate and calculate the number of kTokens to be minted:
* mintTokens = actualMintAmount / exchangeRate
*/
uint256 mintTokens;
(vars.mathErr, mintTokens) = divScalarByExpTruncate(
actualMintAmount,
Exp({mantissa: exchangeRateMantissa})
);
require(
vars.mathErr == MathError.NO_ERROR,
"MINT_EXCHANGE_CALCULATION_FAILED"
);
/*
* We calculate the new total supply of kTokens and minter token balance, checking for overflow:
* totalSupplyNew = totalSupply + mintTokens
* accountTokensNew = accountTokens[minter] + mintTokens
*/
uint256 totalSupplyNew;
(vars.mathErr, totalSupplyNew) = addUInt(totalSupply, mintTokens);
require(
vars.mathErr == MathError.NO_ERROR,
"MINT_NEW_TOTAL_SUPPLY_FAILED"
);
uint256 accountTokensNew;
(vars.mathErr, accountTokensNew) = addUInt(
accountTokens[minter],
mintTokens
);
require(
vars.mathErr == MathError.NO_ERROR,
"MINT_NEW_ACCOUNT_BALANCE_FAILED"
);
/* We write previously calculated values into storage */
totalSupply = totalSupplyNew;
accountTokens[minter] = accountTokensNew;
/* We emit a Mint event, and a Transfer event */
emit Mint(minter, actualMintAmount, mintTokens);
emit Transfer(address(0), minter, mintTokens);
return (uint256(Error.NO_ERROR), actualMintAmount);
}
/**
* @notice Sender redeems kTokens in exchange for the underlying asset
* @dev Accrues interest whether or not the operation succeeds, unless reverted
* @param redeemTokens The number of kTokens to redeem into underlying
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeemInternal(uint256 redeemTokens)
internal
nonReentrant
returns (uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed
return
fail(Error(error), FailureInfo.REDEEM_ACCRUE_INTEREST_FAILED);
}
// redeemFresh emits redeem-specific logs on errors, so we don't need to
return redeemFresh(payable(msg.sender), redeemTokens, 0);
}
/**
* @notice Sender redeems kTokens 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 receive from redeeming kTokens
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeemUnderlyingInternal(uint256 redeemAmount)
internal
nonReentrant
returns (uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed
return
fail(Error(error), FailureInfo.REDEEM_ACCRUE_INTEREST_FAILED);
}
// redeemFresh emits redeem-specific logs on errors, so we don't need to
return redeemFresh(payable(msg.sender), 0, redeemAmount);
}
struct RedeemLocalVars {
Error err;
MathError mathErr;
uint256 exchangeRateMantissa;
uint256 redeemTokens;
uint256 redeemAmount;
uint256 totalSupplyNew;
uint256 accountTokensNew;
}
/**
* @notice User redeems kTokens 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 kTokens 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 kTokens (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 payable redeemer,
uint256 redeemTokensIn,
uint256 redeemAmountIn
) internal returns (uint256) {
require(
redeemTokensIn == 0 || redeemAmountIn == 0,
"tokensIn or amountIn must be 0"
);
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,
uint256(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
*/
if (redeemTokensIn >= accountTokens[redeemer]) {
vars.redeemTokens = accountTokens[redeemer];
} else {
vars.redeemTokens = redeemTokensIn;
}
(vars.mathErr, vars.redeemAmount) = mulScalarTruncate(
Exp({mantissa: vars.exchangeRateMantissa}),
vars.redeemTokens
);
if (vars.mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo.REDEEM_EXCHANGE_TOKENS_CALCULATION_FAILED,
uint256(vars.mathErr)
);
}
} else {
/*
* We get the current exchange rate and calculate the amount to be redeemed:
* redeemTokens = redeemAmountIn / exchangeRate
* redeemAmount = redeemAmountIn
*/
if (redeemAmountIn == type(uint256).max) {
vars.redeemTokens = accountTokens[redeemer];
(vars.mathErr, vars.redeemAmount) = mulScalarTruncate(
Exp({mantissa: vars.exchangeRateMantissa}),
vars.redeemTokens
);
if (vars.mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo
.REDEEM_EXCHANGE_TOKENS_CALCULATION_FAILED,
uint256(vars.mathErr)
);
}
} else {
vars.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,
uint256(vars.mathErr)
);
}
}
}
/* Fail if redeem not allowed */
uint256 allowed = comptroller.redeemAllowed(
address(this),
redeemer,
vars.redeemTokens
);
if (allowed != 0) {
return
failOpaque(
Error.COMPTROLLER_REJECTION,
FailureInfo.REDEEM_COMPTROLLER_REJECTION,
allowed
);
}
/* Verify market's block timestamp equals current block timestamp */
if (accrualBlockTimestamp != getBlockTimestamp()) {
return
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.REDEEM_FRESHNESS_CHECK
);
}
/*
* 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,
uint256(vars.mathErr)
);
}
if (vars.redeemTokens > accountTokens[redeemer])
vars.redeemTokens = accountTokens[redeemer];
(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,
uint256(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)
/* 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);
/* We call the defense hook */
comptroller.redeemVerify(
address(this),
redeemer,
vars.redeemAmount,
vars.redeemTokens
);
/*
* We invoke doTransferOut for the redeemer and the redeemAmount.
* Note: The kToken must handle variations between ERC-20 and NATIVE underlying.
* On success, the kToken has redeemAmount less of cash.
* doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
*/
doTransferOut(redeemer, vars.redeemAmount);
return uint256(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 borrowInternal(uint256 borrowAmount)
internal
nonReentrant
returns (uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return
fail(Error(error), FailureInfo.BORROW_ACCRUE_INTEREST_FAILED);
}
// borrowFresh emits borrow-specific logs on errors, so we don't need to
return borrowFresh(payable(msg.sender), borrowAmount);
}
/**
* @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 payable borrower, uint256 borrowAmount)
internal
returns (uint256)
{
/* Fail if borrow not allowed */
{
uint256 allowed = comptroller.borrowAllowed(
address(this),
borrower,
borrowAmount
);
if (allowed != 0) {
return
failOpaque(
Error.COMPTROLLER_REJECTION,
FailureInfo.BORROW_COMPTROLLER_REJECTION,
allowed
);
}
}
/* Verify market's block timestamp equals current block timestamp */
if (accrualBlockTimestamp != getBlockTimestamp()) {
return
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.BORROW_FRESHNESS_CHECK
);
}
/* Fail gracefully if protocol has insufficient underlying cash */
if (getCashPrior() < borrowAmount) {
return
fail(
Error.TOKEN_INSUFFICIENT_CASH,
FailureInfo.BORROW_CASH_NOT_AVAILABLE
);
}
MathError mathErr;
/*
* We calculate the new borrower and total borrow balances, failing on overflow:
* accountBorrowsNew = accountBorrows + borrowAmount
* totalBorrowsNew = totalBorrows + borrowAmount
*/
uint256 _accountBorrows;
(mathErr, _accountBorrows) = borrowBalanceStoredInternal(borrower);
if (mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo.BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED,
uint256(mathErr)
);
}
uint256 accountBorrowsNew;
(mathErr, accountBorrowsNew) = addUInt(_accountBorrows, borrowAmount);
if (mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo
.BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED,
uint256(mathErr)
);
}
uint256 totalBorrowsNew;
(mathErr, totalBorrowsNew) = addUInt(totalBorrows, borrowAmount);
if (mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo.BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
uint256(mathErr)
);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
/* We write the previously calculated values into storage */
accountBorrows[borrower].principal = accountBorrowsNew;
accountBorrows[borrower].interestIndex = borrowIndex;
totalBorrows = totalBorrowsNew;
/* We emit a Borrow event */
emit Borrow(borrower, borrowAmount, accountBorrowsNew, totalBorrowsNew);
/* We call the defense hook */
// unused function
// comptroller.borrowVerify(address(this), borrower, borrowAmount);
/*
* We invoke doTransferOut for the borrower and the borrowAmount.
* Note: The kToken must handle variations between ERC-20 and NATIVE underlying.
* On success, the kToken borrowAmount less of cash.
* doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
*/
doTransferOut(borrower, borrowAmount);
return uint256(Error.NO_ERROR);
}
/**
* @notice Sender repays their own borrow
* @param repayAmount The amount to repay
* @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
*/
function repayBorrowInternal(uint256 repayAmount)
internal
nonReentrant
returns (uint256, uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return (
fail(
Error(error),
FailureInfo.REPAY_BORROW_ACCRUE_INTEREST_FAILED
),
0
);
}
// repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
return repayBorrowFresh(msg.sender, msg.sender, repayAmount);
}
/**
* @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, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
*/
function repayBorrowBehalfInternal(address borrower, uint256 repayAmount)
internal
nonReentrant
returns (uint256, uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
return (
fail(
Error(error),
FailureInfo.REPAY_BEHALF_ACCRUE_INTEREST_FAILED
),
0
);
}
// repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
return repayBorrowFresh(msg.sender, borrower, repayAmount);
}
struct RepayBorrowLocalVars {
Error err;
MathError mathErr;
uint256 repayAmount;
uint256 borrowerIndex;
uint256 accountBorrows;
uint256 accountBorrowsNew;
uint256 totalBorrowsNew;
uint256 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,
uint256 repayAmount
) internal returns (uint256, uint256) {
/* Fail if repayBorrow not allowed */
uint256 allowed = comptroller.repayBorrowAllowed(
address(this),
payer,
borrower,
repayAmount
);
if (allowed != 0) {
return (
failOpaque(
Error.COMPTROLLER_REJECTION,
FailureInfo.REPAY_BORROW_COMPTROLLER_REJECTION,
allowed
),
0
);
}
/* Verify market's block timestamp equals current block timestamp */
if (accrualBlockTimestamp != getBlockTimestamp()) {
return (
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.REPAY_BORROW_FRESHNESS_CHECK
),
0
);
}
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,
uint256(vars.mathErr)
),
0
);
}
/* If repayAmount >= accountBorrows, repayAmount = accountBorrows */
if (repayAmount >= vars.accountBorrows) {
vars.repayAmount = vars.accountBorrows;
} else {
vars.repayAmount = repayAmount;
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
/*
* We call doTransferIn for the payer and the repayAmount
* Note: The kToken must handle variations between ERC-20 and NATIVE underlying.
* On success, the kToken holds an additional repayAmount of cash.
* doTransferIn reverts if anything goes wrong, since we can't be sure if side effects occurred.
* it returns the amount actually transferred, in case of a fee.
*/
vars.actualRepayAmount = doTransferIn(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_NEW_ACCOUNT_BALANCE_FAILED"
);
(vars.mathErr, vars.totalBorrowsNew) = subUInt(
totalBorrows,
vars.actualRepayAmount
);
require(
vars.mathErr == MathError.NO_ERROR,
"REPAY_NEW_TOTAL_BALANCE_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
);
/* We call the defense hook */
// unused function
// comptroller.repayBorrowVerify(address(this), payer, borrower, vars.actualRepayAmount, vars.borrowerIndex);
return (uint256(Error.NO_ERROR), vars.actualRepayAmount);
}
/**
* @notice The sender liquidates the borrowers collateral.
* The collateral seized is transferred to the liquidator.
* @param borrower The borrower of this kToken to be liquidated
* @param kTokenCollateral The market in which to seize collateral from the borrower
* @param repayAmount The amount of the underlying borrowed asset to repay
* @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
*/
function liquidateBorrowInternal(
address borrower,
uint256 repayAmount,
IKToken kTokenCollateral
) internal nonReentrant returns (uint256, uint256) {
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted liquidation failed
return (
fail(
Error(error),
FailureInfo.LIQUIDATE_ACCRUE_BORROW_INTEREST_FAILED
),
0
);
}
error = kTokenCollateral.accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but we still want to log the fact that an attempted liquidation failed
return (
fail(
Error(error),
FailureInfo.LIQUIDATE_ACCRUE_COLLATERAL_INTEREST_FAILED
),
0
);
}
// liquidateBorrowFresh emits borrow-specific logs on errors, so we don't need to
return
liquidateBorrowFresh(
msg.sender,
borrower,
repayAmount,
kTokenCollateral
);
}
/**
* @notice The liquidator liquidates the borrowers collateral.
* The collateral seized is transferred to the liquidator.
* @param borrower The borrower of this kToken to be liquidated
* @param liquidator The address repaying the borrow and seizing collateral
* @param kTokenCollateral The market in which to seize collateral from the borrower
* @param repayAmount The amount of the underlying borrowed asset to repay
* @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
*/
function liquidateBorrowFresh(
address liquidator,
address borrower,
uint256 repayAmount,
IKToken kTokenCollateral
) internal returns (uint256, uint256) {
/* Fail if liquidate not allowed */
(uint256 allowed, uint256 dynamicLiquidationIncentive) = comptroller.liquidateBorrowAllowed(
address(this),
address(kTokenCollateral),
liquidator,
borrower,
repayAmount
);
if (allowed != 0) {
return (
failOpaque(
Error.COMPTROLLER_REJECTION,
FailureInfo.LIQUIDATE_COMPTROLLER_REJECTION,
allowed
),
0
);
}
/* Verify market's block timestamp equals current block timestamp */
if (accrualBlockTimestamp != getBlockTimestamp()) {
return (
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.LIQUIDATE_FRESHNESS_CHECK
),
0
);
}
/* Verify kTokenCollateral market's block timestamp equals current block timestamp */
if (kTokenCollateral.accrualBlockTimestamp() != getBlockTimestamp()) {
return (
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.LIQUIDATE_COLLATERAL_FRESHNESS_CHECK
),
0
);
}
/* Fail if borrower = liquidator */
if (borrower == liquidator) {
return (
fail(
Error.INVALID_ACCOUNT_PAIR,
FailureInfo.LIQUIDATE_LIQUIDATOR_IS_BORROWER
),
0
);
}
/* Fail if repayAmount = 0 */
if (repayAmount == 0) {
return (
fail(
Error.INVALID_CLOSE_AMOUNT_REQUESTED,
FailureInfo.LIQUIDATE_CLOSE_AMOUNT_IS_ZERO
),
0
);
}
/* Fail if repayAmount = -1 */
if (repayAmount == type(uint256).max) {
return (
fail(
Error.INVALID_CLOSE_AMOUNT_REQUESTED,
FailureInfo.LIQUIDATE_CLOSE_AMOUNT_IS_UINT_MAX
),
0
);
}
/* Fail if repayBorrow fails */
(
uint256 repayBorrowError,
uint256 actualRepayAmount
) = repayBorrowFresh(liquidator, borrower, repayAmount);
if (repayBorrowError != uint256(Error.NO_ERROR)) {
return (
fail(
Error(repayBorrowError),
FailureInfo.LIQUIDATE_REPAY_BORROW_FRESH_FAILED
),
0
);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
/* We calculate the number of collateral tokens that will be seized */
(uint256 amountSeizeError, uint256 seizeTokens) = comptroller
.liquidateCalculateSeizeTokens(
address(this),
address(kTokenCollateral),
actualRepayAmount,
dynamicLiquidationIncentive
);
require(
amountSeizeError == uint256(Error.NO_ERROR),
"LIQUIDATE_COMPTROLLER_CALCULATE_AMOUNT_SEIZE_FAILED"
);
/* Revert if borrower collateral token balance < seizeTokens */
require(
kTokenCollateral.balanceOf(borrower) >= seizeTokens,
"LIQUIDATE_SEIZE_TOO_MUCH"
);
// If this is also the collateral, run seizeInternal to avoid re-entrancy, otherwise make an external call
uint256 seizeError;
if (address(kTokenCollateral) == address(this)) {
seizeError = seizeInternal(
address(this),
liquidator,
borrower,
seizeTokens,
dynamicLiquidationIncentive
);
} else {
seizeError = kTokenCollateral.seize(
liquidator,
borrower,
seizeTokens,
dynamicLiquidationIncentive
);
}
/* Revert if seize tokens fails (since we cannot be sure of side effects) */
require(seizeError == uint256(Error.NO_ERROR), "token seizure failed");
/* We emit a LiquidateBorrow event */
emit LiquidateBorrow(
liquidator,
borrower,
actualRepayAmount,
address(kTokenCollateral),
seizeTokens
);
/* We call the defense hook */
// unused function
// comptroller.liquidateBorrowVerify(address(this), address(kTokenCollateral), liquidator, borrower, actualRepayAmount, seizeTokens);
return (uint256(Error.NO_ERROR), actualRepayAmount);
}
/**
* @notice Transfers collateral tokens (this market) to the liquidator.
* @dev Will fail unless called by another kToken during the process of liquidation.
* Its absolutely critical to use msg.sender as the borrowed kToken and not a parameter.
* @param liquidator The account receiving seized collateral
* @param borrower The account having collateral seized
* @param seizeTokens The number of oTokens to seize
* @param dynamicLiquidationIncentive The liquidation incentive that will be used to calculate protocol seize share
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function seize(
address liquidator,
address borrower,
uint256 seizeTokens,
uint256 dynamicLiquidationIncentive
) external override nonReentrant returns (uint256) {
return seizeInternal(msg.sender, liquidator, borrower, seizeTokens, dynamicLiquidationIncentive);
}
struct SeizeInternalLocalVars {
MathError mathErr;
uint256 borrowerTokensNew;
uint256 liquidatorTokensNew;
uint256 liquidatorSeizeTokens;
uint256 protocolSeizeTokens;
uint256 protocolSeizeAmount;
uint256 exchangeRateMantissa;
uint256 totalReservesNew;
uint256 totalSupplyNew;
}
/**
* @notice Transfers collateral tokens (this market) to the liquidator.
* @dev Called only during an in-kind liquidation, or by liquidateBorrow during the liquidation of another KToken.
* Its absolutely critical to use msg.sender as the seizer kToken and not a parameter.
* @param seizerToken The contract seizing the collateral (i.e. borrowed kToken)
* @param liquidator The account receiving seized collateral
* @param borrower The account having collateral seized
* @param seizeTokens The number of oTokens to seize
* @param dynamicLiquidationIncentive The liquidation incentive that will be used to calculate protocol seize share
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function seizeInternal(
address seizerToken,
address liquidator,
address borrower,
uint256 seizeTokens,
uint256 dynamicLiquidationIncentive
) internal returns (uint256) {
/* Fail if seize not allowed */
uint256 allowed = comptroller.seizeAllowed(
address(this),
seizerToken,
liquidator,
borrower,
seizeTokens
);
if (allowed != 0) {
return
failOpaque(
Error.COMPTROLLER_REJECTION,
FailureInfo.LIQUIDATE_SEIZE_COMPTROLLER_REJECTION,
allowed
);
}
/* Fail if borrower = liquidator */
if (borrower == liquidator) {
return
fail(
Error.INVALID_ACCOUNT_PAIR,
FailureInfo.LIQUIDATE_SEIZE_LIQUIDATOR_IS_BORROWER
);
}
SeizeInternalLocalVars memory vars;
/*
* We calculate the new borrower and liquidator token balances, failing on underflow/overflow:
* borrowerTokensNew = accountTokens[borrower] - seizeTokens
* liquidatorTokensNew = accountTokens[liquidator] + seizeTokens
*/
(vars.mathErr, vars.borrowerTokensNew) = subUInt(
accountTokens[borrower],
seizeTokens
);
if (vars.mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo.LIQUIDATE_SEIZE_BALANCE_DECREMENT_FAILED,
uint256(vars.mathErr)
);
}
if (dynamicLiquidationIncentive > 1e18) {
uint256 i;
unchecked { i = dynamicLiquidationIncentive - 1e18; }
uint256 protocolSeizeShare = mul_(
i,
Exp({mantissa: protocolSeizeShareMantissa})
);
vars.protocolSeizeTokens = mul_(
seizeTokens,
Exp({mantissa: protocolSeizeShare})
);
}
vars.liquidatorSeizeTokens = seizeTokens - vars.protocolSeizeTokens;
(
vars.mathErr,
vars.exchangeRateMantissa
) = exchangeRateStoredInternal();
require(vars.mathErr == MathError.NO_ERROR, "exchange rate math error");
vars.protocolSeizeAmount = mul_ScalarTruncate(
Exp({mantissa: vars.exchangeRateMantissa}),
vars.protocolSeizeTokens
);
vars.totalReservesNew = totalReserves + vars.protocolSeizeAmount;
vars.totalSupplyNew = totalSupply - vars.protocolSeizeTokens;
(vars.mathErr, vars.liquidatorTokensNew) = addUInt(
accountTokens[liquidator],
vars.liquidatorSeizeTokens
);
if (vars.mathErr != MathError.NO_ERROR) {
return
failOpaque(
Error.MATH_ERROR,
FailureInfo.LIQUIDATE_SEIZE_BALANCE_INCREMENT_FAILED,
uint256(vars.mathErr)
);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
/* We write the previously calculated values into storage */
totalReserves = vars.totalReservesNew;
totalSupply = vars.totalSupplyNew;
accountTokens[borrower] = vars.borrowerTokensNew;
accountTokens[liquidator] = vars.liquidatorTokensNew;
/* Emit a Transfer event */
emit Transfer(borrower, liquidator, vars.liquidatorSeizeTokens);
emit Transfer(borrower, address(this), vars.protocolSeizeTokens);
emit ReservesAdded(
address(this),
vars.protocolSeizeAmount,
vars.totalReservesNew
);
return uint256(Error.NO_ERROR);
}
/*** Functions with price update ***/
/**
* @notice Sender borrows assets from the protocol to their own address and updates prices at Pyth's oracle
* @param borrowAmount The amount of the underlying asset to borrow
* @param priceUpdateData data for updating prices on Pyth smart contract
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function borrowWithPriceUpdate(uint256 borrowAmount, bytes[] calldata priceUpdateData)
external
returns (uint256)
{
comptroller.updatePrices(priceUpdateData);
return borrowInternal(borrowAmount);
}
/**
* @notice Sender redeems kTokens in exchange for the underlying asset and updates prices at Pyth's oracle
* @param redeemTokens The number of kTokens to redeem into underlying
* @param priceUpdateData data for updating prices on Pyth smart contract
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeemWithPriceUpdate(uint256 redeemTokens, bytes[] calldata priceUpdateData)
external
returns (uint256)
{
comptroller.updatePrices(priceUpdateData);
return redeemInternal(redeemTokens);
}
/**
* @notice Sender redeems kTokens in exchange for a specified amount of underlying asset and updates prices at Pyth's oracle
* @param redeemAmount The amount of underlying to receive from redeeming kTokens
* @param priceUpdateData data for updating prices on Pyth smart contract
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function redeemUnderlyingWithPriceUpdate(uint256 redeemAmount, bytes[] calldata priceUpdateData)
external
returns (uint256)
{
comptroller.updatePrices(priceUpdateData);
return redeemUnderlyingInternal(redeemAmount);
}
/**
* @notice Transfer `amount` tokens from `msg.sender` to `dst` with updating prices at Pyth's oracle
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
* @param priceUpdateData data for updating prices on Pyth smart contract
* @return Whether or not the transfer succeeded
*/
function transferWithPriceUpdate(address dst, uint256 amount, bytes[] calldata priceUpdateData)
external
nonReentrant
returns (bool)
{
comptroller.updatePrices(priceUpdateData);
return
transferTokens(msg.sender, msg.sender, dst, amount) ==
uint256(Error.NO_ERROR);
}
/**
* @notice Transfer `amount` tokens from `src` to `dst` with updating prices at Pyth's oracle
* @param src The address of the source account
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
* @param priceUpdateData data for updating prices on Pyth smart contract
* @return Whether or not the transfer succeeded
*/
function transferFromWithPriceUpdate(
address src,
address dst,
uint256 amount,
bytes[] calldata priceUpdateData
) external nonReentrant returns (bool) {
comptroller.updatePrices(priceUpdateData);
return
transferTokens(msg.sender, src, dst, amount) ==
uint256(Error.NO_ERROR);
}
/*** Admin Functions ***/
function unauthorized(FailureInfo info) internal returns (uint) {
return fail(Error.UNAUTHORIZED, info);
}
/**
* @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 payable newPendingAdmin)
external
override
returns (uint256)
{
// Check caller = admin
if (msg.sender != admin) {
return unauthorized(FailureInfo.SET_PENDING_ADMIN_OWNER_CHECK);
}
// Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
emit NewPendingAdmin(pendingAdmin, newPendingAdmin);
// Store pendingAdmin with value newPendingAdmin
pendingAdmin = newPendingAdmin;
return uint256(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 override returns (uint256) {
// Check caller is pendingAdmin and pendingAdmin ≠ address(0)
if (msg.sender != pendingAdmin || msg.sender == address(0)) {
return unauthorized(FailureInfo.ACCEPT_ADMIN_PENDING_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 = payable(address(0));
emit NewAdmin(oldAdmin, admin);
emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);
return uint256(Error.NO_ERROR);
}
/**
* @notice Sets a new comptroller for the market
* @dev Admin function to set a new comptroller
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setComptroller(IComptroller newComptroller)
public
override
returns (uint256)
{
// Check caller is admin
if (msg.sender != admin) {
return unauthorized(FailureInfo.SET_COMPTROLLER_OWNER_CHECK);
}
IComptroller oldComptroller = comptroller;
// Ensure invoke comptroller.isComptroller() returns true
require(newComptroller.isComptroller(), "marker method returned false");
// Set market's comptroller to newComptroller
comptroller = newComptroller;
// Emit NewComptroller(oldComptroller, newComptroller)
emit NewComptroller(oldComptroller, newComptroller);
return uint256(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(uint256 newReserveFactorMantissa)
external
override
nonReentrant
returns (uint256)
{
uint256 error = accrueInterest();
if (error != uint256(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.SET_RESERVE_FACTOR_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(uint256 newReserveFactorMantissa)
internal
returns (uint256)
{
// Check caller is admin
if (msg.sender != admin) {
return unauthorized(FailureInfo.SET_RESERVE_FACTOR_ADMIN_CHECK);
}
// Verify market's block timestamp equals current block timestamp
if (accrualBlockTimestamp != getBlockTimestamp()) {
return
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.SET_RESERVE_FACTOR_FRESH_CHECK
);
}
// Check newReserveFactor ≤ maxReserveFactor
if (newReserveFactorMantissa > reserveFactorMaxMantissa) {
return
fail(
Error.BAD_INPUT,
FailureInfo.SET_RESERVE_FACTOR_BOUNDS_CHECK
);
}
uint256 oldReserveFactorMantissa = reserveFactorMantissa;
reserveFactorMantissa = newReserveFactorMantissa;
emit NewReserveFactor(
oldReserveFactorMantissa,
newReserveFactorMantissa
);
return uint256(Error.NO_ERROR);
}
/**
* @notice Accrues interest and reduces reserves by transferring from msg.sender
* @param addAmount Amount of addition to reserves
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _addReservesInternal(uint256 addAmount)
internal
nonReentrant
returns (uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reduce reserves failed.
return
fail(
Error(error),
FailureInfo.ADD_RESERVES_ACCRUE_INTEREST_FAILED
);
}
// _addReservesFresh emits reserve-addition-specific logs on errors, so we don't need to.
(error, ) = _addReservesFresh(addAmount);
return error;
}
/**
* @notice Add reserves by transferring from caller
* @dev Requires fresh interest accrual
* @param addAmount Amount of addition to reserves
* @return (uint, uint) An error code (0=success, otherwise a failure (see ErrorReporter.sol for details)) and the actual amount added, net token fees
*/
function _addReservesFresh(uint256 addAmount)
internal
returns (uint256, uint256)
{
// totalReserves + actualAddAmount
uint256 totalReservesNew;
uint256 actualAddAmount;
// We fail gracefully unless market's block timestamp equals current block timestamp
if (accrualBlockTimestamp != getBlockTimestamp()) {
return (
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.ADD_RESERVES_FRESH_CHECK
),
actualAddAmount
);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
/*
* We call doTransferIn for the caller and the addAmount
* Note: The kToken must handle variations between ERC-20 and NATIVE underlying.
* On success, the kToken holds an additional addAmount of cash.
* doTransferIn reverts if anything goes wrong, since we can't be sure if side effects occurred.
* it returns the amount actually transferred, in case of a fee.
*/
actualAddAmount = doTransferIn(msg.sender, addAmount);
/* Reverts on overflow */
totalReservesNew = totalReserves + actualAddAmount;
// Store reserves[n+1] = reserves[n] + actualAddAmount
totalReserves = totalReservesNew;
/* Emit NewReserves(admin, actualAddAmount, reserves[n+1]) */
emit ReservesAdded(msg.sender, actualAddAmount, totalReservesNew);
/* Return (NO_ERROR, actualAddAmount) */
return (uint256(Error.NO_ERROR), actualAddAmount);
}
/**
* @notice Accrues interest and reduces reserves by transferring to admin
* @param reduceAmount Amount of reduction to reserves
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _reduceReserves(uint256 reduceAmount)
external
override
nonReentrant
returns (uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reduce reserves failed.
return
fail(
Error(error),
FailureInfo.REDUCE_RESERVES_ACCRUE_INTEREST_FAILED
);
}
// _reduceReservesFresh emits reserve-reduction-specific logs on errors, so we don't need to.
return _reduceReservesFresh(reduceAmount);
}
/**
* @notice Reduces reserves by transferring to admin
* @dev Requires fresh interest accrual
* @param reduceAmount Amount of reduction to reserves
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _reduceReservesFresh(uint256 reduceAmount)
internal
returns (uint256)
{
// totalReserves - reduceAmount
uint256 totalReservesNew;
// Check caller is admin
if (msg.sender != admin) {
return unauthorized(FailureInfo.REDUCE_RESERVES_ADMIN_CHECK);
}
// We fail gracefully unless market's block timestamp equals current block timestamp
if (accrualBlockTimestamp != getBlockTimestamp()) {
return
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.REDUCE_RESERVES_FRESH_CHECK
);
}
// Fail gracefully if protocol has insufficient underlying cash
if (getCashPrior() < reduceAmount) {
return
fail(
Error.TOKEN_INSUFFICIENT_CASH,
FailureInfo.REDUCE_RESERVES_CASH_NOT_AVAILABLE
);
}
// Check reduceAmount ≤ reserves[n] (totalReserves)
if (reduceAmount > totalReserves) {
return
fail(Error.BAD_INPUT, FailureInfo.REDUCE_RESERVES_VALIDATION);
}
/////////////////////////
// EFFECTS & INTERACTIONS
// (No safe failures beyond this point)
// We checked reduceAmount <= totalReserves above, so this should never revert.
totalReservesNew = totalReserves - reduceAmount;
// Store reserves[n+1] = reserves[n] - reduceAmount
totalReserves = totalReservesNew;
// doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
doTransferOut(admin, reduceAmount);
emit ReservesReduced(admin, reduceAmount, totalReservesNew);
return uint256(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(IInterestRateModel newInterestRateModel)
public
override
returns (uint256)
{
uint256 error = accrueInterest();
if (error != uint256(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.SET_INTEREST_RATE_MODEL_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(IInterestRateModel newInterestRateModel)
internal
returns (uint256)
{
// Used to store old model for use in the event that is emitted on success
IInterestRateModel oldInterestRateModel;
// Check caller is admin
if (msg.sender != admin) {
return
unauthorized(FailureInfo.SET_INTEREST_RATE_MODEL_OWNER_CHECK);
}
// We fail gracefully unless market's block timestamp equals current block timestamp
if (accrualBlockTimestamp != getBlockTimestamp()) {
return
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.SET_INTEREST_RATE_MODEL_FRESH_CHECK
);
}
// Track the market's 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 NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel)
emit NewMarketInterestRateModel(
oldInterestRateModel,
newInterestRateModel
);
return uint256(Error.NO_ERROR);
}
/**
* @notice accrues interest and updates the protocol seize share using _setProtocolSeizeShareFresh
* @dev Admin function to accrue interest and update the protocol seize share
* @param newProtocolSeizeShareMantissa the new protocol seize share to use
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setProtocolSeizeShare(uint256 newProtocolSeizeShareMantissa)
external
override
nonReentrant
returns (uint256)
{
uint256 error = accrueInterest();
if (error != uint256(Error.NO_ERROR)) {
// accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted change of protocol seize share failed
return
fail(
Error(error),
FailureInfo.SET_PROTOCOL_SEIZE_SHARE_ACCRUE_INTEREST_FAILED
);
}
// _setProtocolSeizeShareFresh emits protocol-seize-share-update-specific logs on errors, so we don't need to.
return _setProtocolSeizeShareFresh(newProtocolSeizeShareMantissa);
}
/**
* @notice updates the protocol seize share (*requires fresh interest accrual)
* @dev Admin function to update the protocol seize share
* @param newProtocolSeizeShareMantissa the new protocol seize share to use
* @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
*/
function _setProtocolSeizeShareFresh(uint256 newProtocolSeizeShareMantissa)
internal
returns (uint256)
{
// Check caller is admin
if (msg.sender != admin) {
return
unauthorized(FailureInfo.SET_PROTOCOL_SEIZE_SHARE_OWNER_CHECK);
}
// We fail gracefully unless market's block timestamp equals current block timestamp
if (accrualBlockTimestamp != getBlockTimestamp()) {
return
fail(
Error.MARKET_NOT_FRESH,
FailureInfo.SET_PROTOCOL_SEIZE_SHARE_FRESH_CHECK
);
}
// Emit NewProtocolSeizeShareMantissa(oldProtocolSeizeShareMantissa, newProtocolSeizeShareMantissa)
emit NewProtocolSeizeShare(
protocolSeizeShareMantissa,
newProtocolSeizeShareMantissa
);
// Set the protocol seize share to newProtocolSeizeShareMantissa
protocolSeizeShareMantissa = newProtocolSeizeShareMantissa;
return uint256(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 owned by this contract
*/
function getCashPrior() internal view virtual returns (uint256);
/**
* @dev Performs a transfer in, reverting upon failure. Returns the amount actually transferred to the protocol, in case of a fee.
* This may revert due to insufficient balance or insufficient allowance.
*/
function doTransferIn(address from, uint256 amount)
internal
virtual
returns (uint256);
/**
* @dev Performs a transfer out, ideally returning an explanatory error code upon failure tather than reverting.
* If caller has not called checked protocol's balance, may revert due to insufficient cash held in the contract.
* If caller has checked protocol's balance, and verified it is >= amount, this should not revert in normal conditions.
*/
function doTransferOut(address payable to, uint256 amount) internal virtual;
/*** Reentrancy Guard ***/
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
*/
modifier nonReentrant() {
require(_notEntered, "re-entered");
_notEntered = false;
_;
_notEntered = true; // get a gas-refund post-Istanbul
}
function requireNoError(uint256 errCode, string memory message)
internal
pure
{
unchecked {
if (errCode == uint256(Error.NO_ERROR)) {
return;
}
bytes memory fullMessage = new bytes(bytes(message).length + 5);
uint256 i;
for (i = 0; i < bytes(message).length; i++) {
fullMessage[i] = bytes(message)[i];
}
fullMessage[i + 0] = bytes1(uint8(32));
fullMessage[i + 1] = bytes1(uint8(40));
fullMessage[i + 2] = bytes1(uint8(48 + (errCode / 10)));
fullMessage[i + 3] = bytes1(uint8(48 + (errCode % 10)));
fullMessage[i + 4] = bytes1(uint8(41));
require(errCode == uint256(Error.NO_ERROR), string(fullMessage));
}
}
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "../interfaces/IEIP20NonStandard.sol";
import "../interfaces/IKToken.sol";
import "../interfaces/IKErc20.sol";
import "../../interfaces/IComptroller.sol";
import "../../interest-rate-models/interfaces/IInterestRateModel.sol";
abstract contract KTokenStorage is IKToken {
bool public constant override isKToken = true;
/**
* @dev Guard variable for re-entrancy checks
*/
bool internal _notEntered;
/**
* @notice EIP-20 token name for this token
*/
string public override name;
/**
* @notice EIP-20 token symbol for this token
*/
string public override symbol;
/**
* @notice EIP-20 token decimals for this token
*/
uint8 public override decimals;
/**
* @notice Maximum borrow rate that can ever be applied (.0005% / block)
*/
uint internal constant borrowRateMaxMantissa = 0.0005e16;
/**
* @notice Maximum fraction of interest that can be set aside for reserves
*/
uint internal constant reserveFactorMaxMantissa = 1e18;
/**
* @notice Administrator for this contract
*/
address payable public admin;
/**
* @notice Pending administrator for this contract
*/
address payable public pendingAdmin;
/**
* @notice Contract which oversees inter-kToken operations
*/
IComptroller public override comptroller;
/**
* @notice Model which tells what the current interest rate should be
*/
IInterestRateModel public interestRateModel;
/**
* @notice Initial exchange rate used when minting the first KTokens (used when totalSupply = 0)
*/
uint internal initialExchangeRateMantissa;
/**
* @notice Fraction of interest currently set aside for reserves
*/
uint public override reserveFactorMantissa;
/**
* @notice Block number that interest was last accrued at
*/
uint public override accrualBlockTimestamp;
/**
* @notice Accumulator of the total earned interest rate since the opening of the market
*/
uint public override borrowIndex;
/**
* @notice Total amount of outstanding borrows of the underlying in this market
*/
uint public override totalBorrows;
/**
* @notice Total amount of reserves of the underlying held in this market
*/
uint public totalReserves;
/**
* @notice Total number of tokens in circulation
*/
uint public override totalSupply;
/**
* @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;
/**
* @notice Share of seized collateral that is added to reserves
*/
uint public protocolSeizeShareMantissa;
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
/**
* @title ERC 20 Token Standard Interface
* https://eips.ethereum.org/EIPS/eip-20
*/
interface IEIP20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
/**
* @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 balance 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 success 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 success 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 success 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 remaining 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);
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
/**
* @title IEIP20NonStandard
* @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 IEIP20NonStandard {
/**
* @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 balance 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 success 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 remaining 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);
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "./IEIP20NonStandard.sol";
import "./IKToken.sol";
interface IKErc20 {
/*** User Interface ***/
function mint(uint mintAmount) external;
function redeem(uint redeemTokens) external;
function redeemUnderlying(uint redeemAmount) external;
function borrow(uint borrowAmount) external;
function repayBorrow(uint repayAmount) external;
function repayBorrowBehalf(address borrower, uint repayAmount) external;
function liquidateBorrow(address borrower, uint repayAmount, IKToken kTokenCollateral) external;
function underlying() external view returns(address);
/*** Admin Functions ***/
function _addReserves(uint addAmount) external returns (uint);
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "../../interfaces/IComptroller.sol";
import "../../interest-rate-models/interfaces/IInterestRateModel.sol";
import "./IEIP20NonStandard.sol";
import "./IEIP20.sol";
interface IKToken is IEIP20{
/**
* @notice Indicator that this is a KToken contract (for inspection)
*/
function isKToken() external view returns(bool);
/*** Market 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 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 a borrow is liquidated
*/
event LiquidateBorrow(address liquidator, address borrower, uint repayAmount, address kTokenCollateral, uint seizeTokens);
/*** 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 comptroller is changed
*/
event NewComptroller(IComptroller oldComptroller, IComptroller newComptroller);
/**
* @notice Event emitted when interestRateModel is changed
*/
event NewMarketInterestRateModel(IInterestRateModel oldInterestRateModel, IInterestRateModel newInterestRateModel);
/**
* @notice Event emitted when the reserve factor is changed
*/
event NewReserveFactor(uint oldReserveFactorMantissa, uint newReserveFactorMantissa);
/**
* @notice Event emitted when the protocol seize share is changed
*/
event NewProtocolSeizeShare(uint oldProtocolSeizeShareMantissa, uint newProtocolSeizeShareMantissa);
/**
* @notice Event emitted when the reserves are added
*/
event ReservesAdded(address benefactor, uint addAmount, uint newTotalReserves);
/**
* @notice Event emitted when the reserves are reduced
*/
event ReservesReduced(address admin, uint reduceAmount, uint newTotalReserves);
function accrualBlockTimestamp() external returns(uint256);
/*** User Interface ***/
function balanceOfUnderlying(address owner) external returns (uint);
function getAccountSnapshot(address account) external view returns (uint, uint, uint, uint);
function borrowRatePerTimestamp() external view returns (uint);
function supplyRatePerTimestamp() external view returns (uint);
function totalBorrowsCurrent() external returns (uint);
function borrowBalanceCurrent(address account) external returns (uint);
function borrowBalanceStored(address account) external view returns (uint);
function exchangeRateCurrent() external returns (uint);
function exchangeRateStored() external view returns (uint);
function getCash() external view returns (uint);
function accrueInterest() external returns (uint);
function seize(address liquidator, address borrower, uint seizeTokens, uint dynamicLiquidationIncentive) external returns (uint);
function totalBorrows() external view returns(uint);
function comptroller() external view returns(IComptroller);
function borrowIndex() external view returns(uint);
function reserveFactorMantissa() external view returns(uint);
/*** Admin Functions ***/
function _setPendingAdmin(address payable newPendingAdmin) external returns (uint);
function _acceptAdmin() external returns (uint);
function _setComptroller(IComptroller newComptroller) external returns (uint);
function _setReserveFactor(uint newReserveFactorMantissa) external returns (uint);
function _reduceReserves(uint reduceAmount) external returns (uint);
function _setInterestRateModel(IInterestRateModel newInterestRateModel) external returns (uint);
function _setProtocolSeizeShare(uint newProtocolSeizeShareMantissa) external returns (uint);
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
/**
* @title Careful Math
* @author KEOM
* @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) {
unchecked {
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) {
unchecked {
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) {
unchecked {
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) {
unchecked {
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);
}
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
contract ComptrollerErrorReporter {
enum Error {
NO_ERROR,
UNAUTHORIZED,
COMPTROLLER_MISMATCH,
INSUFFICIENT_SHORTFALL,
INSUFFICIENT_LIQUIDITY,
INVALID_CLOSE_FACTOR,
INVALID_COLLATERAL_FACTOR,
INVALID_LIQUIDATION_INCENTIVE,
MARKET_NOT_ENTERED, // no longer possible
MARKET_NOT_LISTED,
MARKET_ALREADY_LISTED,
MATH_ERROR,
NONZERO_BORROW_BALANCE,
PRICE_ERROR,
REJECTION,
SNAPSHOT_ERROR,
TOO_MANY_ASSETS,
TOO_MUCH_REPAY
}
enum FailureInfo {
ACCEPT_ADMIN_PENDING_ADMIN_CHECK,
ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK,
EXIT_MARKET_BALANCE_OWED,
EXIT_MARKET_REJECTION,
SET_CLOSE_FACTOR_OWNER_CHECK,
SET_CLOSE_FACTOR_VALIDATION,
SET_COLLATERAL_FACTOR_OWNER_CHECK,
SET_COLLATERAL_FACTOR_NO_EXISTS,
SET_COLLATERAL_FACTOR_VALIDATION,
SET_COLLATERAL_FACTOR_WITHOUT_PRICE,
SET_IMPLEMENTATION_OWNER_CHECK,
SET_LIQUIDATION_INCENTIVE_OWNER_CHECK,
SET_LIQUIDATION_INCENTIVE_VALIDATION,
SET_MAX_ASSETS_OWNER_CHECK,
SET_PENDING_ADMIN_OWNER_CHECK,
SET_PENDING_IMPLEMENTATION_OWNER_CHECK,
SET_PRICE_ORACLE_OWNER_CHECK,
SUPPORT_MARKET_EXISTS,
SUPPORT_MARKET_OWNER_CHECK,
SET_PAUSE_GUARDIAN_OWNER_CHECK
}
/**
* @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);
}
}
contract TokenErrorReporter {
enum Error {
NO_ERROR,
UNAUTHORIZED,
BAD_INPUT,
COMPTROLLER_REJECTION,
COMPTROLLER_CALCULATION_ERROR,
INTEREST_RATE_MODEL_ERROR,
INVALID_ACCOUNT_PAIR,
INVALID_CLOSE_AMOUNT_REQUESTED,
INVALID_COLLATERAL_FACTOR,
MATH_ERROR,
MARKET_NOT_FRESH,
MARKET_NOT_LISTED,
TOKEN_INSUFFICIENT_ALLOWANCE,
TOKEN_INSUFFICIENT_BALANCE,
TOKEN_INSUFFICIENT_CASH,
TOKEN_TRANSFER_IN_FAILED,
TOKEN_TRANSFER_OUT_FAILED
}
/*
* 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 {
ACCEPT_ADMIN_PENDING_ADMIN_CHECK,
ACCRUE_INTEREST_ACCUMULATED_INTEREST_CALCULATION_FAILED,
ACCRUE_INTEREST_BORROW_RATE_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_ACCRUE_INTEREST_FAILED,
BORROW_CASH_NOT_AVAILABLE,
BORROW_FRESHNESS_CHECK,
BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED,
BORROW_MARKET_NOT_LISTED,
BORROW_COMPTROLLER_REJECTION,
LIQUIDATE_ACCRUE_BORROW_INTEREST_FAILED,
LIQUIDATE_ACCRUE_COLLATERAL_INTEREST_FAILED,
LIQUIDATE_COLLATERAL_FRESHNESS_CHECK,
LIQUIDATE_COMPTROLLER_REJECTION,
LIQUIDATE_COMPTROLLER_CALCULATE_AMOUNT_SEIZE_FAILED,
LIQUIDATE_CLOSE_AMOUNT_IS_UINT_MAX,
LIQUIDATE_CLOSE_AMOUNT_IS_ZERO,
LIQUIDATE_FRESHNESS_CHECK,
LIQUIDATE_LIQUIDATOR_IS_BORROWER,
LIQUIDATE_REPAY_BORROW_FRESH_FAILED,
LIQUIDATE_SEIZE_BALANCE_INCREMENT_FAILED,
LIQUIDATE_SEIZE_BALANCE_DECREMENT_FAILED,
LIQUIDATE_SEIZE_COMPTROLLER_REJECTION,
LIQUIDATE_SEIZE_LIQUIDATOR_IS_BORROWER,
LIQUIDATE_SEIZE_TOO_MUCH,
MINT_ACCRUE_INTEREST_FAILED,
MINT_COMPTROLLER_REJECTION,
MINT_EXCHANGE_CALCULATION_FAILED,
MINT_EXCHANGE_RATE_READ_FAILED,
MINT_FRESHNESS_CHECK,
MINT_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED,
MINT_NEW_TOTAL_SUPPLY_CALCULATION_FAILED,
MINT_TRANSFER_IN_FAILED,
MINT_TRANSFER_IN_NOT_POSSIBLE,
REDEEM_ACCRUE_INTEREST_FAILED,
REDEEM_COMPTROLLER_REJECTION,
REDEEM_EXCHANGE_TOKENS_CALCULATION_FAILED,
REDEEM_EXCHANGE_AMOUNT_CALCULATION_FAILED,
REDEEM_EXCHANGE_RATE_READ_FAILED,
REDEEM_FRESHNESS_CHECK,
REDEEM_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED,
REDEEM_NEW_TOTAL_SUPPLY_CALCULATION_FAILED,
REDEEM_TRANSFER_OUT_NOT_POSSIBLE,
REDUCE_RESERVES_ACCRUE_INTEREST_FAILED,
REDUCE_RESERVES_ADMIN_CHECK,
REDUCE_RESERVES_CASH_NOT_AVAILABLE,
REDUCE_RESERVES_FRESH_CHECK,
REDUCE_RESERVES_VALIDATION,
REPAY_BEHALF_ACCRUE_INTEREST_FAILED,
REPAY_BORROW_ACCRUE_INTEREST_FAILED,
REPAY_BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED,
REPAY_BORROW_COMPTROLLER_REJECTION,
REPAY_BORROW_FRESHNESS_CHECK,
REPAY_BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED,
REPAY_BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
REPAY_BORROW_TRANSFER_IN_NOT_POSSIBLE,
SET_COLLATERAL_FACTOR_OWNER_CHECK,
SET_COLLATERAL_FACTOR_VALIDATION,
SET_COMPTROLLER_OWNER_CHECK,
SET_INTEREST_RATE_MODEL_ACCRUE_INTEREST_FAILED,
SET_INTEREST_RATE_MODEL_FRESH_CHECK,
SET_INTEREST_RATE_MODEL_OWNER_CHECK,
SET_MAX_ASSETS_OWNER_CHECK,
SET_ORACLE_MARKET_NOT_LISTED,
SET_PENDING_ADMIN_OWNER_CHECK,
SET_RESERVE_FACTOR_ACCRUE_INTEREST_FAILED,
SET_RESERVE_FACTOR_ADMIN_CHECK,
SET_RESERVE_FACTOR_FRESH_CHECK,
SET_RESERVE_FACTOR_BOUNDS_CHECK,
TRANSFER_COMPTROLLER_REJECTION,
TRANSFER_NOT_ALLOWED,
TRANSFER_NOT_ENOUGH,
TRANSFER_TOO_MUCH,
ADD_RESERVES_ACCRUE_INTEREST_FAILED,
ADD_RESERVES_FRESH_CHECK,
ADD_RESERVES_TRANSFER_IN_NOT_POSSIBLE,
SET_PROTOCOL_SEIZE_SHARE_ACCRUE_INTEREST_FAILED,
SET_PROTOCOL_SEIZE_SHARE_OWNER_CHECK,
SET_PROTOCOL_SEIZE_SHARE_FRESH_CHECK
}
/**
* @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);
}
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "./CarefulMath.sol";
import "./ExponentialNoError.sol";
/**
* @title Exponential module for storing fixed-precision decimals
* @author KEOM
* @dev Legacy contract for compatibility reasons with existing contracts that still use MathError
* @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, ExponentialNoError {
/**
* @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);
}
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
/**
* @title Exponential module for storing fixed-precision decimals
* @author KEOM
* @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 ExponentialNoError {
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 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 Multiply an Exp by a scalar, then truncate to return an unsigned integer.
*/
function mul_ScalarTruncate(Exp memory a, uint scalar) pure internal returns (uint) {
return truncate(mul_(a, scalar));
}
/**
* @dev Multiply an Exp by a scalar, truncate, then add an to an unsigned integer, returning an unsigned integer.
*/
function mul_ScalarTruncateAddUInt(Exp memory a, uint scalar, uint addend) pure internal returns (uint) {
return truncate(mul_(a, scalar)) + addend;
}
/**
* @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) pure internal returns (uint224) {
require(n <= type(uint224).max, "safe224 overflow");
return uint224(n);
}
function safe32(uint n) pure internal returns (uint32) {
require(n <= type(uint32).max, "safe32 overflow");
return uint32(n);
}
function add_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
return Exp({mantissa: a.mantissa + b.mantissa});
}
function add_(Double memory a, Double memory b) pure internal returns (Double memory) {
return Double({mantissa: a.mantissa + b.mantissa});
}
function add_(uint a, uint b, string memory errorMessage) pure internal returns (uint c) {
unchecked {
require((c = a + b ) >= a, errorMessage);
}
}
function sub_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
return Exp({mantissa: a.mantissa - b.mantissa});
}
function sub_(Double memory a, Double memory b) pure internal returns (Double memory) {
return Double({mantissa: a.mantissa - b.mantissa});
}
function sub_(uint a, uint b, string memory errorMessage) pure internal returns (uint c) {
unchecked {
require((c = a - b) <= a, errorMessage);
}
}
function mul_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
return Exp({mantissa: (a.mantissa * b.mantissa) / expScale});
}
function mul_(Exp memory a, uint b) pure internal returns (Exp memory) {
return Exp({mantissa: a.mantissa * b});
}
function mul_(uint a, Exp memory b) pure internal returns (uint) {
return (a * b.mantissa) / expScale;
}
function mul_(Double memory a, Double memory b) pure internal returns (Double memory) {
return Double({mantissa: (a.mantissa * b.mantissa) / doubleScale});
}
function mul_(Double memory a, uint b) pure internal returns (Double memory) {
return Double({mantissa: a.mantissa * b});
}
function mul_(uint a, Double memory b) pure internal returns (uint) {
return (a * b.mantissa) / doubleScale;
}
function mul_(uint a, uint b, string memory errorMessage) pure internal returns (uint c) {
unchecked {
require(a == 0 || (c = a * b) / a == b, errorMessage);
}
}
function div_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
return Exp({mantissa: (a.mantissa * expScale) / b.mantissa});
}
function div_(Exp memory a, uint b) pure internal returns (Exp memory) {
return Exp({mantissa: a.mantissa / b});
}
function div_(uint a, Exp memory b) pure internal returns (uint) {
return (a * expScale) / b.mantissa;
}
function div_(Double memory a, Double memory b) pure internal returns (Double memory) {
return Double({mantissa: (a.mantissa * doubleScale) / b.mantissa});
}
function div_(Double memory a, uint b) pure internal returns (Double memory) {
return Double({mantissa: a.mantissa / b});
}
function div_(uint a, Double memory b) pure internal returns (uint) {
return (a * doubleScale) / b.mantissa;
}
function div_(uint a, uint b, string memory errorMessage) pure internal returns (uint) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
function fraction(uint a, uint b) pure internal returns (Double memory) {
return Double({mantissa: (a * doubleScale) / b});
}
}//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "../ktokens/interfaces/IKToken.sol";
abstract contract PriceOracle {
/// @notice Indicator that this is a PriceOracle contract (for inspection)
bool public constant isPriceOracle = true;
/**
* @notice Get the underlying price of a kToken asset
* @param kToken The kToken to get the underlying price of
* @return The underlying asset price mantissa (scaled by 1e18).
* Zero means the price is unavailable.
*/
function getUnderlyingPrice(IKToken kToken) external virtual view returns (uint);
/**
* @notice Updates multiple price feeds on Pyth oracle
* @param priceUpdateData received from Pyth network and used to update the oracle
*/
function updateUnderlyingPrices(bytes[] calldata priceUpdateData) external virtual;
}{
"optimizer": {
"enabled": true,
"runs": 1
},
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"remappings": [
"ds-test/=lib/forge-std/lib/ds-test/src/",
"forge-std/=lib/forge-std/src/"
],
"libraries": {}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
Contract ABI
API[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"cashPrior","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"interestAccumulated","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"borrowIndex","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"totalBorrows","type":"uint256"}],"name":"AccrueInterest","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"borrower","type":"address"},{"indexed":false,"internalType":"uint256","name":"borrowAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"accountBorrows","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"totalBorrows","type":"uint256"}],"name":"Borrow","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"error","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"info","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"detail","type":"uint256"}],"name":"Failure","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"liquidator","type":"address"},{"indexed":false,"internalType":"address","name":"borrower","type":"address"},{"indexed":false,"internalType":"uint256","name":"repayAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"kTokenCollateral","type":"address"},{"indexed":false,"internalType":"uint256","name":"seizeTokens","type":"uint256"}],"name":"LiquidateBorrow","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"minter","type":"address"},{"indexed":false,"internalType":"uint256","name":"mintAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"mintTokens","type":"uint256"}],"name":"Mint","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":"contract IComptroller","name":"oldComptroller","type":"address"},{"indexed":false,"internalType":"contract IComptroller","name":"newComptroller","type":"address"}],"name":"NewComptroller","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"contract IInterestRateModel","name":"oldInterestRateModel","type":"address"},{"indexed":false,"internalType":"contract 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IComptroller","name":"newComptroller","type":"address"}],"name":"_setComptroller","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IInterestRateModel","name":"newInterestRateModel","type":"address"}],"name":"_setInterestRateModel","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address 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Creation Code
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Multichain Portfolio | 35 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.