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Contract Name:
MWethDelegate
Compiler Version
v0.8.19+commit.7dd6d404
Optimization Enabled:
Yes with 1 runs
Other Settings:
paris EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; import {SafeERC20} from "@openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol"; import {IERC20} from "@openzeppelin-contracts/contracts/token/ERC20/IERC20.sol"; import {WethUnwrapper} from "@protocol/WethUnwrapper.sol"; import {MErc20Delegate} from "@protocol/MErc20Delegate.sol"; /** * @title Moonwell's MWethDelegate Contract * @notice MToken which wraps underlying ETH * @author Moonwell */ contract MWethDelegate is MErc20Delegate { using SafeERC20 for IERC20; /// @notice the WETH unwrapper address address public immutable wethUnwrapper; /// @notice construct a new MWethDelegate /// @param _wethUnwrapper the WETH Unwrapper address constructor(address _wethUnwrapper) { wethUnwrapper = _wethUnwrapper; } /// @notice transfer ETH underlying to the recipient /// first unwrap the WETH into raw ETH, then transfer /// @param to the recipient address /// @param amount the amount of ETH to transfer function doTransferOut( address payable to, uint256 amount ) internal virtual override { IERC20 weth = IERC20(underlying); weth.safeTransfer(wethUnwrapper, amount); WethUnwrapper(payable(wethUnwrapper)).send(to, amount); /// send to user through wethUnwrapper } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; /** * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } /** * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful. */ function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } /** * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 oldAllowance = token.allowance(address(this), spender); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value)); } /** * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value)); } } /** * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to * 0 before setting it to a non-zero value. */ function forceApprove(IERC20 token, address spender, uint256 value) internal { bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value); if (!_callOptionalReturnBool(token, approvalCall)) { _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0)); _callOptionalReturn(token, approvalCall); } } /** * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`. * Revert on invalid signature. */ function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). * * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead. */ function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false // and not revert is the subcall reverts. (bool success, bytes memory returndata) = address(token).call(data); return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address from, address to, uint256 amount) external returns (bool); }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; import {WETH9} from "@protocol/router/IWETH.sol"; contract WethUnwrapper { /// @notice reference to the WETH contract address public immutable weth; /// @notice construct a new WethUnwrapper /// @param _weth the WETH contract address constructor(address _weth) { weth = _weth; } /// @notice transfer ETH underlying to the recipient /// first unwrap the WETH into raw ETH, then transfer /// @param to the recipient address /// @param amount the amount of ETH to transfer function send(address payable to, uint256 amount) external { WETH9(weth).withdraw(amount); (bool success, bytes memory returndata) = to.call{value: amount}(""); if (!success) { if (returndata.length == 0) revert(); assembly { revert(add(32, returndata), mload(returndata)) } } } receive() external payable { require(msg.sender == weth, "not accepting eth"); } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; import "./MErc20.sol"; /** * @title Moonwell's MErc20Delegate Contract * @notice MTokens which wrap an EIP-20 underlying and are delegated to * @author Moonwell */ contract MErc20Delegate is MErc20, MDelegateInterface { /** * @notice Construct an empty delegate */ constructor() {} /** * @notice Called by the delegator on a delegate to initialize it for duty * @param data The encoded bytes data for any initialization */ function _becomeImplementation(bytes memory data) public virtual override { // Shh -- currently unused data; // Shh -- we don't ever want this hook to be marked pure if (false) { implementation = address(0); } require( msg.sender == admin, "only the admin may call _becomeImplementation" ); } /** * @notice Called by the delegator on a delegate to forfeit its responsibility */ function _resignImplementation() public virtual override { // Shh -- we don't ever want this hook to be marked pure if (false) { implementation = address(0); } require( msg.sender == admin, "only the admin may call _resignImplementation" ); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (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 * * Furthermore, `isContract` will also return true if the target contract within * the same transaction is already scheduled for destruction by `SELFDESTRUCT`, * which only has an effect at the end of a transaction. * ==== * * [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://consensys.net/diligence/blog/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/v0.8.0/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 functionCallWithValue(target, data, 0, "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"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or 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 { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // 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 /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
/** *Submitted for verification at Etherscan.io on 2017-12-12 */ // Copyright (C) 2015, 2016, 2017 Dapphub // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. pragma solidity 0.8.19; interface WETH9 { function balanceOf(address guy) external view returns (uint); function allowance(address, address) external view returns (uint); function deposit() external payable; function withdraw(uint wad) external; function totalSupply() external view returns (uint); function approve(address guy, uint wad) external returns (bool); function transfer(address dst, uint wad) external returns (bool); function transferFrom( address src, address dst, uint wad ) external returns (bool); }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; import "@openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol"; import "./MToken.sol"; /** * @title Moonwell's MErc20 Contract * @notice MTokens which wrap an EIP-20 underlying * @author Moonwell */ contract MErc20 is MToken, MErc20Interface { /** * @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 */ function initialize( address underlying_, ComptrollerInterface comptroller_, InterestRateModel interestRateModel_, uint initialExchangeRateMantissa_, string memory name_, string memory symbol_, uint8 decimals_ ) public { // MToken initialize does the bulk of the work super.initialize( comptroller_, interestRateModel_, initialExchangeRateMantissa_, name_, symbol_, decimals_ ); // Set underlying and sanity check it underlying = underlying_; EIP20Interface(underlying).totalSupply(); } /*** User Interface ***/ /** * @notice Sender supplies assets into the market and receives mTokens in exchange * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param mintAmount The amount of the underlying asset to supply * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function mint(uint mintAmount) external override returns (uint) { (uint err, ) = mintInternal(mintAmount); return err; } /** * @notice Supply assets but without a 2-step approval process, EIP-2612 * @dev Simply calls the underlying token's `permit()` function and then assumes things worked * @param mintAmount The amount of the underlying asset to supply * @param deadline The amount of the underlying asset to supply * @param v ECDSA recovery id for the signature * @param r ECDSA r parameter for the signature * @param s ECDSA s parameter for the signature * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function mintWithPermit( uint mintAmount, uint deadline, uint8 v, bytes32 r, bytes32 s ) external override returns (uint) { IERC20Permit token = IERC20Permit(underlying); // Go submit our pre-approval signature data to the underlying token, but // explicitly fail if there is an issue. SafeERC20.safePermit( token, msg.sender, address(this), mintAmount, deadline, v, r, s ); (uint err, ) = mintInternal(mintAmount); return err; } /** * @notice Sender redeems mTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of mTokens to redeem into underlying * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeem(uint redeemTokens) external override returns (uint) { return redeemInternal(redeemTokens); } /** * @notice Sender redeems mTokens in exchange for a specified amount of underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemAmount The amount of underlying to redeem * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlying( uint redeemAmount ) external override returns (uint) { return redeemUnderlyingInternal(redeemAmount); } /** * @notice Sender borrows assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function borrow(uint borrowAmount) external override returns (uint) { return borrowInternal(borrowAmount); } /** * @notice Sender repays their own borrow * @param repayAmount The amount to repay, or uint.max for the full outstanding amount * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function repayBorrow(uint repayAmount) external override returns (uint) { (uint err, ) = repayBorrowInternal(repayAmount); return err; } /** * @notice Sender repays a borrow belonging to borrower * @param borrower the account with the debt being payed off * @param repayAmount The amount to repay, or uint.max for the full outstanding amount * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function repayBorrowBehalf( address borrower, uint repayAmount ) external override returns (uint) { (uint err, ) = repayBorrowBehalfInternal(borrower, repayAmount); return err; } /** * @notice The sender liquidates the borrowers collateral. * The collateral seized is transferred to the liquidator. * @param borrower The borrower of this mToken to be liquidated * @param repayAmount The amount of the underlying borrowed asset to repay * @param mTokenCollateral The market in which to seize collateral from the borrower * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function liquidateBorrow( address borrower, uint repayAmount, MTokenInterface mTokenCollateral ) external override returns (uint) { (uint err, ) = liquidateBorrowInternal( borrower, repayAmount, mTokenCollateral ); return err; } /** * @notice A public function to sweep accidental ERC-20 transfers to this contract. Tokens are sent to admin (timelock) * @param token The address of the ERC-20 token to sweep */ function sweepToken(EIP20NonStandardInterface token) external override { require( msg.sender == admin, "MErc20::sweepToken: only admin can sweep tokens" ); require( address(token) != underlying, "MErc20::sweepToken: can not sweep underlying token" ); uint256 balance = token.balanceOf(address(this)); token.transfer(admin, balance); } /** * @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(uint addAmount) external override returns (uint) { 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 view virtual override returns (uint) { EIP20Interface token = EIP20Interface(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, uint amount ) internal virtual override returns (uint) { // Read from storage once address underlying_ = underlying; EIP20NonStandardInterface token = EIP20NonStandardInterface( underlying_ ); uint balanceBefore = EIP20Interface(underlying_).balanceOf( address(this) ); token.transferFrom(from, address(this), amount); bool success; assembly { switch returndatasize() case 0 { // This is a non-standard ERC-20 success := not(0) // set success to true } case 32 { // This is a compliant ERC-20 returndatacopy(0, 0, 32) success := mload(0) // Set `success = returndata` of external call } default { // This is an excessively non-compliant ERC-20, revert. revert(0, 0) } } require(success, "TOKEN_TRANSFER_IN_FAILED"); // Calculate the amount that was *actually* transferred uint balanceAfter = EIP20Interface(underlying_).balanceOf( address(this) ); require(balanceAfter >= balanceBefore, "TOKEN_TRANSFER_IN_OVERFLOW"); return balanceAfter - balanceBefore; // underflow already checked above, just subtract } /** * @dev Similar to EIP20 transfer, except it handles a False success from `transfer` and returns an explanatory * error code rather than reverting. If caller has not called checked protocol's balance, this may revert due to * insufficient cash held in this contract. If caller has checked protocol's balance prior to this call, and verified * it is >= amount, this should not revert in normal conditions. * * Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value. * See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca */ function doTransferOut( address payable to, uint amount ) internal virtual override { EIP20NonStandardInterface token = EIP20NonStandardInterface(underlying); token.transfer(to, amount); bool success; assembly { switch returndatasize() case 0 { // This is a non-standard ERC-20 success := not(0) // set success to true } case 32 { // This is a compliant ERC-20 returndatacopy(0, 0, 32) success := mload(0) // Set `success = returndata` of override external call } default { // This is an excessively non-compliant ERC-20, revert. revert(0, 0) } } require(success, "TOKEN_TRANSFER_OUT_FAILED"); } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; import "./ComptrollerInterface.sol"; import "./MTokenInterfaces.sol"; import "./ErrorReporter.sol"; import "./Exponential.sol"; import "./EIP20Interface.sol"; import "./irm/InterestRateModel.sol"; /** * @title Moonwell's MToken Contract * @notice Abstract base for MTokens * @author Moonwell */ abstract contract MToken is MTokenInterface, Exponential, TokenErrorReporter { /** * @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( ComptrollerInterface comptroller_, InterestRateModel interestRateModel_, uint initialExchangeRateMantissa_, string memory name_, string memory symbol_, uint8 decimals_ ) public { require(msg.sender == admin, "only admin may initialize the market"); require( accrualBlockTimestamp == 0 && borrowIndex == 0, "market may only be initialized once" ); // Set initial exchange rate initialExchangeRateMantissa = initialExchangeRateMantissa_; require( initialExchangeRateMantissa > 0, "initial exchange rate must be greater than zero." ); // Set the comptroller uint err = _setComptroller(comptroller_); require(err == uint(Error.NO_ERROR), "setting 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) err = _setInterestRateModelFresh(interestRateModel_); require( err == uint(Error.NO_ERROR), "setting 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, uint tokens ) internal returns (uint) { /* Fail if transfer not allowed */ uint allowed = comptroller.transferAllowed( address(this), src, dst, tokens ); if (allowed != 0) { return failOpaque( Error.COMPTROLLER_REJECTION, FailureInfo.TRANSFER_COMPTROLLER_REJECTION, allowed ); } /* Do not allow self-transfers */ if (src == dst) { return fail(Error.BAD_INPUT, FailureInfo.TRANSFER_NOT_ALLOWED); } /* Get the allowance, infinite for the account owner */ uint startingAllowance = 0; if (spender == src) { startingAllowance = type(uint).max; } else { startingAllowance = transferAllowances[src][spender]; } /* Do the calculations, checking for {under,over}flow */ MathError mathErr; uint allowanceNew; uint srcTokensNew; uint dstTokensNew; (mathErr, allowanceNew) = subUInt(startingAllowance, tokens); if (mathErr != MathError.NO_ERROR) { return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_NOT_ALLOWED); } (mathErr, srcTokensNew) = subUInt(accountTokens[src], tokens); if (mathErr != MathError.NO_ERROR) { return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_NOT_ENOUGH); } (mathErr, dstTokensNew) = addUInt(accountTokens[dst], tokens); if (mathErr != MathError.NO_ERROR) { return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_TOO_MUCH); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) accountTokens[src] = srcTokensNew; accountTokens[dst] = dstTokensNew; /* Eat some of the allowance (if necessary) */ if (startingAllowance != type(uint).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 uint(Error.NO_ERROR); } /** * @notice Transfer `amount` tokens from `msg.sender` to `dst` * @param dst The address of the destination account * @param amount The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transfer( address dst, uint256 amount ) external override nonReentrant returns (bool) { return transferTokens(msg.sender, msg.sender, dst, amount) == uint(Error.NO_ERROR); } /** * @notice Transfer `amount` tokens from `src` to `dst` * @param src The address of the source account * @param dst The address of the destination account * @param amount The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transferFrom( address src, address dst, uint256 amount ) external override nonReentrant returns (bool) { return transferTokens(msg.sender, src, dst, amount) == uint(Error.NO_ERROR); } /** * @notice Approve `spender` to transfer up to `amount` from `src` * @dev This will overwrite the approval amount for `spender` * and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve) * @param spender The address of the account which may transfer tokens * @param amount The number of tokens that are approved (uint.max 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 (uint.max 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 (uint) { Exp memory exchangeRate = Exp({mantissa: exchangeRateCurrent()}); (MathError mErr, uint balance) = mulScalarTruncate( exchangeRate, accountTokens[owner] ); require(mErr == MathError.NO_ERROR, "balance could not be calculated"); return balance; } /** * @notice Get 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 (uint, uint, uint, uint) { uint mTokenBalance = accountTokens[account]; uint borrowBalance; uint exchangeRateMantissa; MathError mErr; (mErr, borrowBalance) = borrowBalanceStoredInternal(account); if (mErr != MathError.NO_ERROR) { return (uint(Error.MATH_ERROR), 0, 0, 0); } (mErr, exchangeRateMantissa) = exchangeRateStoredInternal(); if (mErr != MathError.NO_ERROR) { return (uint(Error.MATH_ERROR), 0, 0, 0); } return ( uint(Error.NO_ERROR), mTokenBalance, 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 (uint) { return block.timestamp; } /** * @notice Returns the current per-timestamp borrow interest rate for this mToken * @return The borrow interest rate per timestamp, scaled by 1e18 */ function borrowRatePerTimestamp() external view override returns (uint) { return interestRateModel.getBorrowRate( getCashPrior(), totalBorrows, totalReserves ); } /** * @notice Returns the current per-timestamp supply interest rate for this mToken * @return The supply interest rate per timestamp, scaled by 1e18 */ function supplyRatePerTimestamp() external view override returns (uint) { return interestRateModel.getSupplyRate( getCashPrior(), totalBorrows, totalReserves, reserveFactorMantissa ); } /** * @notice Returns the current total borrows plus accrued interest * @return The total borrows with interest */ function totalBorrowsCurrent() external override nonReentrant returns (uint) { require( accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed" ); return totalBorrows; } /** * @notice Accrue interest to updated borrowIndex and then calculate account's borrow balance using the updated borrowIndex * @param account The address whose balance should be calculated after updating borrowIndex * @return The calculated balance */ function borrowBalanceCurrent( address account ) external override nonReentrant returns (uint) { require( accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed" ); return borrowBalanceStored(account); } /** * @notice Return the borrow balance of account based on stored data * @param account The address whose balance should be calculated * @return The calculated balance */ function borrowBalanceStored( address account ) public view override returns (uint) { (MathError err, uint result) = borrowBalanceStoredInternal(account); require( err == MathError.NO_ERROR, "borrowBalanceStored: borrowBalanceStoredInternal failed" ); return result; } /** * @notice Return the borrow balance of account based on stored data * @param account The address whose balance should be calculated * @return (error code, the calculated balance or 0 if error code is non-zero) */ function borrowBalanceStoredInternal( address account ) internal view returns (MathError, uint) { /* Note: we do not assert that the market is up to date */ MathError mathErr; uint principalTimesIndex; uint result; /* Get borrowBalance and borrowIndex */ BorrowSnapshot storage borrowSnapshot = accountBorrows[account]; /* If borrowBalance = 0 then borrowIndex is likely also 0. * Rather than failing the calculation with a division by 0, we immediately return 0 in this case. */ if (borrowSnapshot.principal == 0) { return (MathError.NO_ERROR, 0); } /* Calculate new borrow balance using the interest index: * recentBorrowBalance = borrower.borrowBalance * 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 (uint) { require( accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed" ); return exchangeRateStored(); } /** * @notice Calculates the exchange rate from the underlying to the MToken * @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 (uint) { (MathError err, uint result) = exchangeRateStoredInternal(); require( err == MathError.NO_ERROR, "exchangeRateStored: exchangeRateStoredInternal failed" ); return result; } /** * @notice Calculates the exchange rate from the underlying to the MToken * @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, uint) { uint _totalSupply = totalSupply; if (_totalSupply == 0) { /* * If there are no tokens minted: * exchangeRate = initialExchangeRate */ return (MathError.NO_ERROR, initialExchangeRateMantissa); } else { /* * Otherwise: * exchangeRate = (totalCash + totalBorrows - totalReserves) / totalSupply */ uint totalCash = getCashPrior(); uint cashPlusBorrowsMinusReserves; Exp memory exchangeRate; MathError mathErr; (mathErr, cashPlusBorrowsMinusReserves) = addThenSubUInt( totalCash, totalBorrows, totalReserves ); if (mathErr != MathError.NO_ERROR) { return (mathErr, 0); } (mathErr, exchangeRate) = getExp( cashPlusBorrowsMinusReserves, _totalSupply ); if (mathErr != MathError.NO_ERROR) { return (mathErr, 0); } return (MathError.NO_ERROR, exchangeRate.mantissa); } } /** * @notice Get cash balance of this mToken in the underlying asset * @return The quantity of underlying asset owned by this contract */ function getCash() external view override returns (uint) { return getCashPrior(); } /** * @notice Applies accrued interest to total borrows and reserves * @dev This calculates interest accrued from the last checkpointed block * up to the current block and writes new checkpoint to storage. */ function accrueInterest() public virtual override returns (uint) { /* Remember the initial block timestamp */ uint currentBlockTimestamp = getBlockTimestamp(); uint accrualBlockTimestampPrior = accrualBlockTimestamp; /* Short-circuit accumulating 0 interest */ if (accrualBlockTimestampPrior == currentBlockTimestamp) { return uint(Error.NO_ERROR); } /* Read the previous values out of storage */ uint cashPrior = getCashPrior(); uint borrowsPrior = totalBorrows; uint reservesPrior = totalReserves; uint borrowIndexPrior = borrowIndex; /* Calculate the current borrow interest rate */ uint borrowRateMantissa = interestRateModel.getBorrowRate( cashPrior, borrowsPrior, reservesPrior ); require( borrowRateMantissa <= borrowRateMaxMantissa, "borrow rate is absurdly high" ); /* Calculate the number of blocks elapsed since the last accrual */ (MathError mathErr, uint 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; uint interestAccumulated; uint totalBorrowsNew; uint totalReservesNew; uint borrowIndexNew; (mathErr, simpleInterestFactor) = mulScalar( Exp({mantissa: borrowRateMantissa}), blockDelta ); if (mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo .ACCRUE_INTEREST_SIMPLE_INTEREST_FACTOR_CALCULATION_FAILED, uint(mathErr) ); } (mathErr, interestAccumulated) = mulScalarTruncate( simpleInterestFactor, borrowsPrior ); if (mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo .ACCRUE_INTEREST_ACCUMULATED_INTEREST_CALCULATION_FAILED, uint(mathErr) ); } (mathErr, totalBorrowsNew) = addUInt(interestAccumulated, borrowsPrior); if (mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo .ACCRUE_INTEREST_NEW_TOTAL_BORROWS_CALCULATION_FAILED, uint(mathErr) ); } (mathErr, totalReservesNew) = mulScalarTruncateAddUInt( Exp({mantissa: reserveFactorMantissa}), interestAccumulated, reservesPrior ); if (mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo .ACCRUE_INTEREST_NEW_TOTAL_RESERVES_CALCULATION_FAILED, uint(mathErr) ); } (mathErr, borrowIndexNew) = mulScalarTruncateAddUInt( simpleInterestFactor, borrowIndexPrior, borrowIndexPrior ); if (mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo .ACCRUE_INTEREST_NEW_BORROW_INDEX_CALCULATION_FAILED, uint(mathErr) ); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* We write the previously calculated values into storage */ accrualBlockTimestamp = currentBlockTimestamp; borrowIndex = borrowIndexNew; totalBorrows = totalBorrowsNew; totalReserves = totalReservesNew; /* We emit an AccrueInterest event */ emit AccrueInterest( cashPrior, interestAccumulated, borrowIndexNew, totalBorrowsNew ); return uint(Error.NO_ERROR); } /** * @notice Sender supplies assets into the market and receives mTokens 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( uint mintAmount ) internal nonReentrant returns (uint, uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed return ( fail(Error(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; uint exchangeRateMantissa; uint mintTokens; uint totalSupplyNew; uint accountTokensNew; uint actualMintAmount; } /** * @notice User supplies assets into the market and receives mTokens in exchange * @dev Assumes interest has already been accrued up to the current block * @param minter The address of the account which is supplying the assets * @param mintAmount The amount of the underlying asset to supply * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual mint amount. */ function mintFresh( address minter, uint mintAmount ) internal returns (uint, uint) { /* Fail if mint not allowed */ uint 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; ( vars.mathErr, vars.exchangeRateMantissa ) = exchangeRateStoredInternal(); if (vars.mathErr != MathError.NO_ERROR) { return ( failOpaque( Error.MATH_ERROR, FailureInfo.MINT_EXCHANGE_RATE_READ_FAILED, uint(vars.mathErr) ), 0 ); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We call `doTransferIn` for the minter and the mintAmount. * Note: The mToken must handle variations between ERC-20 and GLMR 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 mToken holds an additional `actualMintAmount` * of cash. */ vars.actualMintAmount = doTransferIn(minter, mintAmount); /* * We get the current exchange rate and calculate the number of mTokens to be minted: * mintTokens = actualMintAmount / exchangeRate */ (vars.mathErr, vars.mintTokens) = divScalarByExpTruncate( vars.actualMintAmount, Exp({mantissa: vars.exchangeRateMantissa}) ); require( vars.mathErr == MathError.NO_ERROR, "MINT_EXCHANGE_CALCULATION_FAILED" ); /* * We calculate the new total supply of mTokens and minter token balance, checking for overflow: * totalSupplyNew = totalSupply + mintTokens * accountTokensNew = accountTokens[minter] + mintTokens */ (vars.mathErr, vars.totalSupplyNew) = addUInt( totalSupply, vars.mintTokens ); require( vars.mathErr == MathError.NO_ERROR, "MINT_NEW_TOTAL_SUPPLY_CALCULATION_FAILED" ); (vars.mathErr, vars.accountTokensNew) = addUInt( accountTokens[minter], vars.mintTokens ); require( vars.mathErr == MathError.NO_ERROR, "MINT_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED" ); /* We write previously calculated values into storage */ totalSupply = vars.totalSupplyNew; accountTokens[minter] = vars.accountTokensNew; /* We emit a Mint event, and a Transfer event */ emit Mint(minter, vars.actualMintAmount, vars.mintTokens); emit Transfer(address(this), minter, vars.mintTokens); /* We call the defense hook */ // unused function // comptroller.mintVerify(address(this), minter, vars.actualMintAmount, vars.mintTokens); return (uint(Error.NO_ERROR), vars.actualMintAmount); } /** * @notice Sender redeems mTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of mTokens to redeem into underlying * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemInternal( uint redeemTokens ) internal nonReentrant returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed return fail(Error(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 mTokens 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 mTokens * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlyingInternal( uint redeemAmount ) internal nonReentrant returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed return fail(Error(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; uint exchangeRateMantissa; uint redeemTokens; uint redeemAmount; uint totalSupplyNew; uint accountTokensNew; } /** * @notice User redeems mTokens 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 mTokens 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 mTokens (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, uint redeemTokensIn, uint redeemAmountIn ) internal returns (uint) { require( redeemTokensIn == 0 || redeemAmountIn == 0, "one of redeemTokensIn or redeemAmountIn must be zero" ); RedeemLocalVars memory vars; /* exchangeRate = invoke Exchange Rate Stored() */ ( vars.mathErr, vars.exchangeRateMantissa ) = exchangeRateStoredInternal(); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo.REDEEM_EXCHANGE_RATE_READ_FAILED, uint(vars.mathErr) ); } /* If redeemTokensIn > 0: */ if (redeemTokensIn > 0) { /* * We calculate the exchange rate and the amount of underlying to be redeemed: * redeemTokens = redeemTokensIn * redeemAmount = redeemTokensIn x exchangeRateCurrent */ if (redeemTokensIn == type(uint).max) { 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, uint(vars.mathErr) ); } } else { /* * We get the current exchange rate and calculate the amount to be redeemed: * redeemTokens = redeemAmountIn / exchangeRate * redeemAmount = redeemAmountIn */ if (redeemAmountIn == type(uint).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, uint(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, uint(vars.mathErr) ); } } } /* Fail if redeem not allowed */ uint 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, uint(vars.mathErr) ); } (vars.mathErr, vars.accountTokensNew) = subUInt( accountTokens[redeemer], vars.redeemTokens ); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo.REDEEM_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED, uint(vars.mathErr) ); } /* Fail gracefully if protocol has insufficient cash */ if (getCashPrior() < vars.redeemAmount) { return fail( Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.REDEEM_TRANSFER_OUT_NOT_POSSIBLE ); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* 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 mToken must handle variations between ERC-20 and GLMR underlying. * On success, the mToken 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 uint(Error.NO_ERROR); } /** * @notice Sender borrows assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function borrowInternal( uint borrowAmount ) internal nonReentrant returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed return fail(Error(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); } struct BorrowLocalVars { MathError mathErr; uint accountBorrows; uint accountBorrowsNew; uint totalBorrowsNew; } /** * @notice Users borrow assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function borrowFresh( address payable borrower, uint borrowAmount ) internal returns (uint) { /* Fail if borrow not allowed */ uint 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 ); } BorrowLocalVars memory vars; /* * We calculate the new borrower and total borrow balances, failing on overflow: * accountBorrowsNew = accountBorrows + borrowAmount * totalBorrowsNew = totalBorrows + borrowAmount */ (vars.mathErr, vars.accountBorrows) = borrowBalanceStoredInternal( borrower ); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo.BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED, uint(vars.mathErr) ); } (vars.mathErr, vars.accountBorrowsNew) = addUInt( vars.accountBorrows, borrowAmount ); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo .BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED, uint(vars.mathErr) ); } (vars.mathErr, vars.totalBorrowsNew) = addUInt( totalBorrows, borrowAmount ); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque( Error.MATH_ERROR, FailureInfo.BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED, uint(vars.mathErr) ); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* We write the previously calculated values into storage */ accountBorrows[borrower].principal = vars.accountBorrowsNew; accountBorrows[borrower].interestIndex = borrowIndex; totalBorrows = vars.totalBorrowsNew; /* We emit a Borrow event */ emit Borrow( borrower, borrowAmount, vars.accountBorrowsNew, vars.totalBorrowsNew ); /* * We invoke doTransferOut for the borrower and the borrowAmount. * Note: The mToken must handle variations between ERC-20 and GLMR underlying. * On success, the mToken borrowAmount less of cash. * doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred. */ doTransferOut(borrower, borrowAmount); /* We call the defense hook */ // unused function // comptroller.borrowVerify(address(this), borrower, borrowAmount); return uint(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( uint repayAmount ) internal nonReentrant returns (uint, uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed return ( fail( Error(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, uint repayAmount ) internal nonReentrant returns (uint, uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed return ( fail( Error(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; uint repayAmount; uint borrowerIndex; uint accountBorrows; uint accountBorrowsNew; uint totalBorrowsNew; uint actualRepayAmount; } /** * @notice Borrows are repaid by another user (possibly the borrower). * @param payer the account paying off the borrow * @param borrower the account with the debt being payed off * @param repayAmount the amount of underlying tokens being returned * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount. */ function repayBorrowFresh( address payer, address borrower, uint repayAmount ) internal returns (uint, uint) { /* Fail if repayBorrow not allowed */ uint 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, uint(vars.mathErr) ), 0 ); } /* If repayAmount == uint.max, repayAmount = accountBorrows */ if (repayAmount == type(uint).max) { 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 mToken must handle variations between ERC-20 and GLMR underlying. * On success, the mToken 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_BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED" ); (vars.mathErr, vars.totalBorrowsNew) = subUInt( totalBorrows, vars.actualRepayAmount ); require( vars.mathErr == MathError.NO_ERROR, "REPAY_BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED" ); /* We write the previously calculated values into storage */ accountBorrows[borrower].principal = vars.accountBorrowsNew; accountBorrows[borrower].interestIndex = borrowIndex; totalBorrows = vars.totalBorrowsNew; /* We emit a RepayBorrow event */ emit RepayBorrow( payer, borrower, vars.actualRepayAmount, vars.accountBorrowsNew, vars.totalBorrowsNew ); /* We call the defense hook */ // unused function // comptroller.repayBorrowVerify(address(this), payer, borrower, vars.actualRepayAmount, vars.borrowerIndex); return (uint(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 mToken to be liquidated * @param mTokenCollateral 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, uint repayAmount, MTokenInterface mTokenCollateral ) internal nonReentrant returns (uint, uint) { uint error = accrueInterest(); if (error != uint(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 = mTokenCollateral.accrueInterest(); if (error != uint(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, mTokenCollateral ); } /** * @notice The liquidator liquidates the borrowers collateral. * The collateral seized is transferred to the liquidator. * @param borrower The borrower of this mToken to be liquidated * @param liquidator The address repaying the borrow and seizing collateral * @param mTokenCollateral 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, uint repayAmount, MTokenInterface mTokenCollateral ) internal returns (uint, uint) { /* Fail if liquidate not allowed */ uint allowed = comptroller.liquidateBorrowAllowed( address(this), address(mTokenCollateral), 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 mTokenCollateral market's block timestamp equals current block timestamp */ if (mTokenCollateral.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 = uint.max */ if (repayAmount == type(uint).max) { return ( fail( Error.INVALID_CLOSE_AMOUNT_REQUESTED, FailureInfo.LIQUIDATE_CLOSE_AMOUNT_IS_UINT_MAX ), 0 ); } /* Fail if repayBorrow fails */ (uint repayBorrowError, uint actualRepayAmount) = repayBorrowFresh( liquidator, borrower, repayAmount ); if (repayBorrowError != uint(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 */ (uint amountSeizeError, uint seizeTokens) = comptroller .liquidateCalculateSeizeTokens( address(this), address(mTokenCollateral), actualRepayAmount ); require( amountSeizeError == uint(Error.NO_ERROR), "LIQUIDATE_COMPTROLLER_CALCULATE_AMOUNT_SEIZE_FAILED" ); /* Revert if borrower collateral token balance < seizeTokens */ require( mTokenCollateral.balanceOf(borrower) >= seizeTokens, "LIQUIDATE_SEIZE_TOO_MUCH" ); // If this is also the collateral, run seizeInternal to avoid re-entrancy, otherwise make an external call uint seizeError; if (address(mTokenCollateral) == address(this)) { seizeError = seizeInternal( address(this), liquidator, borrower, seizeTokens ); } else { seizeError = mTokenCollateral.seize( liquidator, borrower, seizeTokens ); } /* Revert if seize tokens fails (since we cannot be sure of side effects) */ require(seizeError == uint(Error.NO_ERROR), "token seizure failed"); /* We emit a LiquidateBorrow event */ emit LiquidateBorrow( liquidator, borrower, actualRepayAmount, address(mTokenCollateral), seizeTokens ); /* We call the defense hook */ // unused function // comptroller.liquidateBorrowVerify(address(this), address(mTokenCollateral), liquidator, borrower, actualRepayAmount, seizeTokens); return (uint(Error.NO_ERROR), actualRepayAmount); } /** * @notice Transfers collateral tokens (this market) to the liquidator. * @dev Will fail unless called by another mToken during the process of liquidation. * Its absolutely critical to use msg.sender as the borrowed mToken and not a parameter. * @param liquidator The account receiving seized collateral * @param borrower The account having collateral seized * @param seizeTokens The number of mTokens to seize * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function seize( address liquidator, address borrower, uint seizeTokens ) external override nonReentrant returns (uint) { return seizeInternal(msg.sender, liquidator, borrower, seizeTokens); } struct SeizeInternalLocalVars { MathError mathErr; uint borrowerTokensNew; uint liquidatorTokensNew; uint liquidatorSeizeTokens; uint protocolSeizeTokens; uint protocolSeizeAmount; uint exchangeRateMantissa; uint totalReservesNew; uint 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 MToken. * Its absolutely critical to use msg.sender as the seizer mToken and not a parameter. * @param seizerToken The contract seizing the collateral (i.e. borrowed mToken) * @param liquidator The account receiving seized collateral * @param borrower The account having collateral seized * @param seizeTokens The number of mTokens to seize * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function seizeInternal( address seizerToken, address liquidator, address borrower, uint seizeTokens ) internal returns (uint) { /* Fail if seize not allowed */ uint 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, uint(vars.mathErr) ); } vars.protocolSeizeTokens = mul_( seizeTokens, Exp({mantissa: protocolSeizeShareMantissa}) ); vars.liquidatorSeizeTokens = sub_( 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 = add_(totalReserves, vars.protocolSeizeAmount); vars.totalSupplyNew = sub_(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, uint(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 ); /* We call the defense hook */ // unused function // comptroller.seizeVerify(address(this), seizerToken, liquidator, borrower, seizeTokens); return uint(Error.NO_ERROR); } /*** Admin Functions ***/ /** * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer. * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer. * @param newPendingAdmin New pending admin. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setPendingAdmin( address payable newPendingAdmin ) external override returns (uint) { // Check caller = admin if (msg.sender != admin) { return fail( Error.UNAUTHORIZED, FailureInfo.SET_PENDING_ADMIN_OWNER_CHECK ); } // Save current value, if any, for inclusion in log address oldPendingAdmin = pendingAdmin; // Store pendingAdmin with value newPendingAdmin pendingAdmin = newPendingAdmin; // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin) emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin); return uint(Error.NO_ERROR); } /** * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin * @dev Admin function for pending admin to accept role and update admin * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _acceptAdmin() external override returns (uint) { // Check caller is pendingAdmin and pendingAdmin ≠ address(0) if (msg.sender != pendingAdmin || msg.sender == address(0)) { return fail( Error.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 uint(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( ComptrollerInterface newComptroller ) public override returns (uint) { // Check caller is admin if (msg.sender != admin) { return fail( Error.UNAUTHORIZED, FailureInfo.SET_COMPTROLLER_OWNER_CHECK ); } ComptrollerInterface 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 uint(Error.NO_ERROR); } /** * @notice accrues interest and sets a new reserve factor for the protocol using _setReserveFactorFresh * @dev Admin function to accrue interest and set a new reserve factor * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setReserveFactor( uint newReserveFactorMantissa ) external override nonReentrant returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reserve factor change failed. return fail( Error(error), FailureInfo.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( uint newReserveFactorMantissa ) internal returns (uint) { // Check caller is admin if (msg.sender != admin) { return fail( Error.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 ); } uint oldReserveFactorMantissa = reserveFactorMantissa; reserveFactorMantissa = newReserveFactorMantissa; emit NewReserveFactor( oldReserveFactorMantissa, newReserveFactorMantissa ); return uint(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( uint addAmount ) internal nonReentrant returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted 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(uint addAmount) internal returns (uint, uint) { // totalReserves + actualAddAmount uint totalReservesNew; uint 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 mToken must handle variations between ERC-20 and GLMR underlying. * On success, the mToken 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); totalReservesNew = totalReserves + actualAddAmount; /* Revert on overflow */ require( totalReservesNew >= totalReserves, "add reserves unexpected overflow" ); // 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 (uint(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( uint reduceAmount ) external override nonReentrant returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted 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(uint reduceAmount) internal returns (uint) { // totalReserves - reduceAmount uint totalReservesNew; // Check caller is admin if (msg.sender != admin) { return fail( Error.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) totalReservesNew = totalReserves - reduceAmount; // We checked reduceAmount <= totalReserves above, so this should never revert. require( totalReservesNew <= totalReserves, "reduce reserves unexpected underflow" ); // 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 uint(Error.NO_ERROR); } /** * @notice accrues interest and updates the interest rate model using _setInterestRateModelFresh * @dev Admin function to accrue interest and update the interest rate model * @param newInterestRateModel the new interest rate model to use * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setInterestRateModel( InterestRateModel newInterestRateModel ) public override returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted change of interest rate model failed return fail( Error(error), FailureInfo.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( InterestRateModel newInterestRateModel ) internal returns (uint) { // Used to store old model for use in the event that is emitted on success InterestRateModel oldInterestRateModel; // Check caller is admin if (msg.sender != admin) { return fail( Error.UNAUTHORIZED, FailureInfo.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 uint(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( uint newProtocolSeizeShareMantissa ) external override nonReentrant returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted change of 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( uint newProtocolSeizeShareMantissa ) internal returns (uint) { // Used to store old share for use in the event that is emitted on success uint oldProtocolSeizeShareMantissa; // Check caller is admin if (msg.sender != admin) { return fail( Error.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 ); } // Track the market's current protocol seize share oldProtocolSeizeShareMantissa = protocolSeizeShareMantissa; // Set the protocol seize share to newProtocolSeizeShareMantissa protocolSeizeShareMantissa = newProtocolSeizeShareMantissa; // Emit NewProtocolSeizeShareMantissa(oldProtocolSeizeShareMantissa, newProtocolSeizeShareMantissa) emit NewProtocolSeizeShare( oldProtocolSeizeShareMantissa, newProtocolSeizeShareMantissa ); return uint(Error.NO_ERROR); } /*** Safe Token ***/ /** * @notice Gets balance of this contract in terms of the underlying * @dev This excludes the value of the current message, if any * @return The quantity of underlying owned by this contract */ function getCashPrior() internal view virtual returns (uint); /** * @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, uint amount ) internal virtual returns (uint); /** * @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, uint 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 } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; abstract contract ComptrollerInterface { /// @notice Indicator that this is a Comptroller contract (for inspection) bool public constant isComptroller = true; /*** Assets You Are In ***/ function enterMarkets( address[] calldata mTokens ) external virtual returns (uint[] memory); function exitMarket(address mToken) external virtual returns (uint); /*** Policy Hooks ***/ function mintAllowed( address mToken, address minter, uint mintAmount ) external virtual returns (uint); function redeemAllowed( address mToken, address redeemer, uint redeemTokens ) external virtual returns (uint); // Do not remove, still used by MToken function redeemVerify( address mToken, address redeemer, uint redeemAmount, uint redeemTokens ) external pure virtual; function borrowAllowed( address mToken, address borrower, uint borrowAmount ) external virtual returns (uint); function repayBorrowAllowed( address mToken, address payer, address borrower, uint repayAmount ) external virtual returns (uint); function liquidateBorrowAllowed( address mTokenBorrowed, address mTokenCollateral, address liquidator, address borrower, uint repayAmount ) external view virtual returns (uint); function seizeAllowed( address mTokenCollateral, address mTokenBorrowed, address liquidator, address borrower, uint seizeTokens ) external virtual returns (uint); function transferAllowed( address mToken, address src, address dst, uint transferTokens ) external virtual returns (uint); /*** Liquidity/Liquidation Calculations ***/ function liquidateCalculateSeizeTokens( address mTokenBorrowed, address mTokenCollateral, uint repayAmount ) external view virtual returns (uint, uint); } // The hooks that were patched out of the comptroller to make room for the supply caps, if we need them abstract contract ComptrollerInterfaceWithAllVerificationHooks is ComptrollerInterface { function mintVerify( address mToken, address minter, uint mintAmount, uint mintTokens ) external virtual; // Included in ComptrollerInterface already // function redeemVerify(address mToken, address redeemer, uint redeemAmount, uint redeemTokens) virtual external; function borrowVerify( address mToken, address borrower, uint borrowAmount ) external virtual; function repayBorrowVerify( address mToken, address payer, address borrower, uint repayAmount, uint borrowerIndex ) external virtual; function liquidateBorrowVerify( address mTokenBorrowed, address mTokenCollateral, address liquidator, address borrower, uint repayAmount, uint seizeTokens ) external virtual; function seizeVerify( address mTokenCollateral, address mTokenBorrowed, address liquidator, address borrower, uint seizeTokens ) external virtual; function transferVerify( address mToken, address src, address dst, uint transferTokens ) external virtual; }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; import "./ComptrollerInterface.sol"; import "./irm/InterestRateModel.sol"; import "./EIP20NonStandardInterface.sol"; import "./ErrorReporter.sol"; contract MTokenStorage { /// @dev Guard variable for re-entrancy checks bool internal _notEntered; /// @notice EIP-20 token name for this token string public name; /// @notice EIP-20 token symbol for this token string public symbol; /// @notice EIP-20 token decimals for this token uint8 public 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-mToken operations ComptrollerInterface public comptroller; /// @notice Model which tells what the current interest rate should be InterestRateModel public interestRateModel; // @notice Initial exchange rate used when minting the first MTokens (used when totalSupply = 0) uint internal initialExchangeRateMantissa; /// @notice Fraction of interest currently set aside for reserves uint public reserveFactorMantissa; /// @notice Block number that interest was last accrued at uint public accrualBlockTimestamp; /// @notice Accumulator of the total earned interest rate since the opening of the market uint public borrowIndex; /// @notice Total amount of outstanding borrows of the underlying in this market uint public 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 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; } abstract contract MTokenInterface is MTokenStorage { /// @notice Indicator that this is a MToken contract (for inspection) bool public constant isMToken = true; /*** 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 mTokenCollateral, 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( ComptrollerInterface oldComptroller, ComptrollerInterface newComptroller ); /// @notice Event emitted when interestRateModel is changed event NewMarketInterestRateModel( InterestRateModel oldInterestRateModel, InterestRateModel 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 ); /// @notice EIP20 Transfer event event Transfer(address indexed from, address indexed to, uint amount); /// @notice EIP20 Approval event event Approval(address indexed owner, address indexed spender, uint amount); /*** User Interface ***/ function transfer(address dst, uint amount) external virtual returns (bool); function transferFrom( address src, address dst, uint amount ) external virtual returns (bool); function approve( address spender, uint amount ) external virtual returns (bool); function allowance( address owner, address spender ) external view virtual returns (uint); function balanceOf(address owner) external view virtual returns (uint); function balanceOfUnderlying(address owner) external virtual returns (uint); function getAccountSnapshot( address account ) external view virtual returns (uint, uint, uint, uint); function borrowRatePerTimestamp() external view virtual returns (uint); function supplyRatePerTimestamp() external view virtual returns (uint); function totalBorrowsCurrent() external virtual returns (uint); function borrowBalanceCurrent( address account ) external virtual returns (uint); function borrowBalanceStored( address account ) external view virtual returns (uint); function exchangeRateCurrent() external virtual returns (uint); function exchangeRateStored() external view virtual returns (uint); function getCash() external view virtual returns (uint); function accrueInterest() external virtual returns (uint); function seize( address liquidator, address borrower, uint seizeTokens ) external virtual returns (uint); /*** Admin Functions ***/ function _setPendingAdmin( address payable newPendingAdmin ) external virtual returns (uint); function _acceptAdmin() external virtual returns (uint); function _setComptroller( ComptrollerInterface newComptroller ) external virtual returns (uint); function _setReserveFactor( uint newReserveFactorMantissa ) external virtual returns (uint); function _reduceReserves(uint reduceAmount) external virtual returns (uint); function _setInterestRateModel( InterestRateModel newInterestRateModel ) external virtual returns (uint); function _setProtocolSeizeShare( uint newProtocolSeizeShareMantissa ) external virtual returns (uint); } contract MErc20Storage { /// @notice Underlying asset for this MToken address public underlying; } abstract contract MErc20Interface is MErc20Storage { /*** User Interface ***/ function mint(uint mintAmount) external virtual returns (uint); function mintWithPermit( uint mintAmount, uint deadline, uint8 v, bytes32 r, bytes32 s ) external virtual returns (uint); function redeem(uint redeemTokens) external virtual returns (uint); function redeemUnderlying( uint redeemAmount ) external virtual returns (uint); function borrow(uint borrowAmount) external virtual returns (uint); function repayBorrow(uint repayAmount) external virtual returns (uint); function repayBorrowBehalf( address borrower, uint repayAmount ) external virtual returns (uint); function liquidateBorrow( address borrower, uint repayAmount, MTokenInterface mTokenCollateral ) external virtual returns (uint); function sweepToken(EIP20NonStandardInterface token) external virtual; /*** Admin Functions ***/ function _addReserves(uint addAmount) external virtual returns (uint); } contract MDelegationStorage { /// @notice Implementation address for this contract address public implementation; } abstract contract MDelegatorInterface is MDelegationStorage { /// @notice Emitted when implementation is changed event NewImplementation( address oldImplementation, address newImplementation ); /** * @notice Called by the admin to update the implementation of the delegator * @param implementation_ The address of the new implementation for delegation * @param allowResign Flag to indicate whether to call _resignImplementation on the old implementation * @param becomeImplementationData The encoded bytes data to be passed to _becomeImplementation */ function _setImplementation( address implementation_, bool allowResign, bytes memory becomeImplementationData ) external virtual; } abstract contract MDelegateInterface is MDelegationStorage { /** * @notice Called by the delegator on a delegate to initialize it for duty * @dev Should revert if any issues arise which make it unfit for delegation * @param data The encoded bytes data for any initialization */ function _becomeImplementation(bytes memory data) external virtual; /// @notice Called by the delegator on a delegate to forfeit its responsibility function _resignImplementation() external virtual; }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; 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, SET_GAS_AMOUNT_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: BSD-3-Clause pragma solidity 0.8.19; import "./CarefulMath.sol"; import "./ExponentialNoError.sol"; /** * @title Exponential module for storing fixed-precision decimals * @author Moonwell * @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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure 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 ) internal pure returns (MathError, Exp memory) { return getExp(a.mantissa, b.mantissa); } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; /** * @title ERC 20 Token Standard Interface * https://eips.ethereum.org/EIPS/eip-20 */ interface EIP20Interface { 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: BSD-3-Clause pragma solidity 0.8.19; /** * @title Moonwell's InterestRateModel Interface * @author Moonwell */ abstract contract InterestRateModel { /// @notice Indicator that this is an InterestRateModel contract (for inspection) bool public constant isInterestRateModel = true; /** * @notice Calculates the current borrow interest rate per timestamp * @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 timestamp (as a percentage, and scaled by 1e18) */ function getBorrowRate( uint cash, uint borrows, uint reserves ) external view virtual returns (uint); /** * @notice Calculates the current supply interest rate per timestamp * @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 timestamp (as a percentage, and scaled by 1e18) */ function getSupplyRate( uint cash, uint borrows, uint reserves, uint reserveFactorMantissa ) external view virtual returns (uint); }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; /** * @title EIP20NonStandardInterface * @dev Version of ERC20 with no return values for `transfer` and `transferFrom` * See https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca */ interface EIP20NonStandardInterface { /** * @notice Get the total number of tokens in circulation * @return The supply of tokens */ function totalSupply() external view returns (uint256); /** * @notice Gets the balance of the specified address * @param owner The address from which the balance will be retrieved * @return 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: BSD-3-Clause pragma solidity 0.8.19; /** * @title Careful Math * @author Moonwell * @notice Derived from OpenZeppelin's SafeMath library * https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/math/SafeMath.sol */ contract CarefulMath { /** * @dev Possible error codes that we can return */ enum MathError { NO_ERROR, DIVISION_BY_ZERO, INTEGER_OVERFLOW, INTEGER_UNDERFLOW } /** * @dev Multiplies two numbers, returns an error on overflow. */ function mulUInt(uint a, uint b) internal pure returns (MathError, uint) { if (a == 0) { return (MathError.NO_ERROR, 0); } uint c = a * b; if (c / a != b) { return (MathError.INTEGER_OVERFLOW, 0); } else { return (MathError.NO_ERROR, c); } } /** * @dev Integer division of two numbers, truncating the quotient. */ function divUInt(uint a, uint b) internal pure returns (MathError, uint) { if (b == 0) { return (MathError.DIVISION_BY_ZERO, 0); } return (MathError.NO_ERROR, a / b); } /** * @dev Subtracts two numbers, returns an error on overflow (i.e. if subtrahend is greater than minuend). */ function subUInt(uint a, uint b) internal pure returns (MathError, uint) { if (b <= a) { return (MathError.NO_ERROR, a - b); } else { return (MathError.INTEGER_UNDERFLOW, 0); } } /** * @dev Adds two numbers, returns an error on overflow. */ function addUInt(uint a, uint b) internal pure returns (MathError, uint) { uint c = a + b; if (c >= a) { return (MathError.NO_ERROR, c); } else { return (MathError.INTEGER_OVERFLOW, 0); } } /** * @dev add a and b and then subtract c */ function addThenSubUInt( uint a, uint b, uint c ) internal pure returns (MathError, uint) { (MathError err0, uint sum) = addUInt(a, b); if (err0 != MathError.NO_ERROR) { return (err0, 0); } return subUInt(sum, c); } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.19; /** * @title Exponential module for storing fixed-precision decimals * @author Moonwell * @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) internal pure 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 ) internal pure returns (uint) { Exp memory product = mul_(a, scalar); return truncate(product); } /** * @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 ) internal pure returns (uint) { Exp memory product = mul_(a, scalar); return add_(truncate(product), addend); } /** * @dev Checks if first Exp is less than second Exp. */ function lessThanExp( Exp memory left, Exp memory right ) internal pure returns (bool) { return left.mantissa < right.mantissa; } /** * @dev Checks if left Exp <= right Exp. */ function lessThanOrEqualExp( Exp memory left, Exp memory right ) internal pure returns (bool) { return left.mantissa <= right.mantissa; } /** * @dev Checks if left Exp > right Exp. */ function greaterThanExp( Exp memory left, Exp memory right ) internal pure returns (bool) { return left.mantissa > right.mantissa; } /** * @dev returns true if Exp is exactly zero */ function isZeroExp(Exp memory value) internal pure returns (bool) { return value.mantissa == 0; } function safe224( uint n, string memory errorMessage ) internal pure returns (uint224) { require(n < 2 ** 224, errorMessage); return uint224(n); } function safe32( uint n, string memory errorMessage ) internal pure returns (uint32) { require(n < 2 ** 32, errorMessage); return uint32(n); } function add_( Exp memory a, Exp memory b ) internal pure returns (Exp memory) { return Exp({mantissa: add_(a.mantissa, b.mantissa)}); } function add_( Double memory a, Double memory b ) internal pure returns (Double memory) { return Double({mantissa: add_(a.mantissa, b.mantissa)}); } function add_(uint a, uint b) internal pure returns (uint) { return add_(a, b, "addition overflow"); } function add_( uint a, uint b, string memory errorMessage ) internal pure returns (uint) { uint c = a + b; require(c >= a, errorMessage); return c; } function sub_( Exp memory a, Exp memory b ) internal pure returns (Exp memory) { return Exp({mantissa: sub_(a.mantissa, b.mantissa)}); } function sub_( Double memory a, Double memory b ) internal pure returns (Double memory) { return Double({mantissa: sub_(a.mantissa, b.mantissa)}); } function sub_(uint a, uint b) internal pure returns (uint) { return sub_(a, b, "subtraction underflow"); } function sub_( uint a, uint b, string memory errorMessage ) internal pure returns (uint) { require(b <= a, errorMessage); return a - b; } function mul_( Exp memory a, Exp memory b ) internal pure returns (Exp memory) { return Exp({mantissa: mul_(a.mantissa, b.mantissa) / expScale}); } function mul_(Exp memory a, uint b) internal pure returns (Exp memory) { return Exp({mantissa: mul_(a.mantissa, b)}); } function mul_(uint a, Exp memory b) internal pure returns (uint) { return mul_(a, b.mantissa) / expScale; } function mul_( Double memory a, Double memory b ) internal pure returns (Double memory) { return Double({mantissa: mul_(a.mantissa, b.mantissa) / doubleScale}); } function mul_( Double memory a, uint b ) internal pure returns (Double memory) { return Double({mantissa: mul_(a.mantissa, b)}); } function mul_(uint a, Double memory b) internal pure returns (uint) { return mul_(a, b.mantissa) / doubleScale; } function mul_(uint a, uint b) internal pure returns (uint) { return mul_(a, b, "multiplication overflow"); } function mul_( uint a, uint b, string memory errorMessage ) internal pure returns (uint) { if (a == 0 || b == 0) { return 0; } uint c = a * b; require(c / a == b, errorMessage); return c; } function div_( Exp memory a, Exp memory b ) internal pure returns (Exp memory) { return Exp({mantissa: div_(mul_(a.mantissa, expScale), b.mantissa)}); } function div_(Exp memory a, uint b) internal pure returns (Exp memory) { return Exp({mantissa: div_(a.mantissa, b)}); } function div_(uint a, Exp memory b) internal pure returns (uint) { return div_(mul_(a, expScale), b.mantissa); } function div_( Double memory a, Double memory b ) internal pure returns (Double memory) { return Double({mantissa: div_(mul_(a.mantissa, doubleScale), b.mantissa)}); } function div_( Double memory a, uint b ) internal pure returns (Double memory) { return Double({mantissa: div_(a.mantissa, b)}); } function div_(uint a, Double memory b) internal pure returns (uint) { return div_(mul_(a, doubleScale), b.mantissa); } function div_(uint a, uint b) internal pure returns (uint) { return div_(a, b, "divide by zero"); } function div_( uint a, uint b, string memory errorMessage ) internal pure returns (uint) { require(b > 0, errorMessage); return a / b; } function fraction(uint a, uint b) internal pure returns (Double memory) { return Double({mantissa: div_(mul_(a, doubleScale), b)}); } }
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Contract Security Audit
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EIP20NonStandardInterface","name":"token","type":"address"}],"name":"sweepToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalBorrows","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalBorrowsCurrent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalReserves","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"underlying","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"wethUnwrapper","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000a962f2974a846b30366251f4634384c1e42aef16
-----Decoded View---------------
Arg [0] : _wethUnwrapper (address): 0xa962F2974A846b30366251f4634384C1e42aeF16
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a962f2974a846b30366251f4634384c1e42aef16
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Multichain Portfolio | 31 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.