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Latest 25 from a total of 889 transactions
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Borrow | 21844040 | 30 hrs ago | IN | 0 ETH | 0.00042642 | ||||
Redeem Underlyin... | 21831364 | 3 days ago | IN | 0 ETH | 0.00069791 | ||||
Mint | 21829277 | 3 days ago | IN | 0 ETH | 0.00031478 | ||||
Redeem Underlyin... | 21818903 | 4 days ago | IN | 0 ETH | 0.00038674 | ||||
Redeem Underlyin... | 21816721 | 5 days ago | IN | 0 ETH | 0.00083756 | ||||
Repay Borrow | 21814385 | 5 days ago | IN | 0 ETH | 0.00018421 | ||||
Repay Borrow | 21814379 | 5 days ago | IN | 0 ETH | 0.00011739 | ||||
Repay Borrow | 21810541 | 5 days ago | IN | 0 ETH | 0.00012105 | ||||
Repay Borrow | 21810531 | 5 days ago | IN | 0 ETH | 0.00012464 | ||||
Redeem Underlyin... | 21810293 | 5 days ago | IN | 0 ETH | 0.00052748 | ||||
Repay Borrow | 21809456 | 6 days ago | IN | 0 ETH | 0.00013809 | ||||
Repay Borrow | 21809447 | 6 days ago | IN | 0 ETH | 0.00016557 | ||||
Mint | 21808823 | 6 days ago | IN | 0 ETH | 0.00019547 | ||||
Borrow | 21807838 | 6 days ago | IN | 0 ETH | 0.00027301 | ||||
Borrow | 21807303 | 6 days ago | IN | 0 ETH | 0.00025222 | ||||
Redeem Underlyin... | 21805513 | 6 days ago | IN | 0 ETH | 0.0004366 | ||||
Redeem Underlyin... | 21804982 | 6 days ago | IN | 0 ETH | 0.00039464 | ||||
Mint | 21804226 | 6 days ago | IN | 0 ETH | 0.00019235 | ||||
Redeem Underlyin... | 21804166 | 6 days ago | IN | 0 ETH | 0.00047172 | ||||
Mint | 21804156 | 6 days ago | IN | 0 ETH | 0.00020471 | ||||
Repay Borrow | 21803130 | 6 days ago | IN | 0 ETH | 0.00014214 | ||||
Repay Borrow | 21803120 | 6 days ago | IN | 0 ETH | 0.0001485 | ||||
Repay Borrow | 21800356 | 7 days ago | IN | 0 ETH | 0.00014446 | ||||
Redeem Underlyin... | 21800350 | 7 days ago | IN | 0 ETH | 0.00027612 | ||||
Repay Borrow | 21800316 | 7 days ago | IN | 0 ETH | 0.0001079 |
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Contract Source Code Verified (Exact Match)
Contract Name:
CErc20InterestMarketDelegator
Compiler Version
v0.8.23+commit.f704f362
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; import "CTokenInterfaces.sol"; import "CErc20InterestMarket.sol"; /** * @title Compound's CErc20Delegator Contract * @notice CTokens which wrap an EIP-20 underlying and delegate to an implementation * @author Compound */ contract CErc20InterestMarketDelegator is CTokenInterface, CErc20InterestMarketInterface, CDelegatorInterface { error Unauthorized(); /** * @notice Construct a new money market * @param underlying_ The address of the underlying asset * @param comptroller_ The address of the Comptroller * @param interestRateModel_ The address of the interest rate model * @param initialExchangeRateMantissa_ The initial exchange rate, scaled by 1e18 * @param name_ ERC-20 name of this token * @param symbol_ ERC-20 symbol of this token * @param decimals_ ERC-20 decimal precision of this token * @param admin_ Address of the administrator of this token * @param implementation_ The address of the implementation the contract delegates to * @param becomeImplementationData The encoded args for becomeImplementation */ constructor(address underlying_, ComptrollerInterface comptroller_, InterestRateModel interestRateModel_, uint initialExchangeRateMantissa_, string memory name_, string memory symbol_, uint8 decimals_, address payable admin_, address implementation_, bytes memory becomeImplementationData) { // Creator of the contract is admin during initialization admin = payable(msg.sender); // First delegate gets to initialize the delegator (i.e. storage contract) delegateTo(implementation_, abi.encodeWithSignature("initialize(address,address,address,uint256,string,string,uint8)", underlying_, comptroller_, interestRateModel_, initialExchangeRateMantissa_, name_, symbol_, decimals_)); // New implementations always get set via the settor (post-initialize) _setImplementation(implementation_, false, becomeImplementationData); // Set the proper admin now that initialization is done admin = admin_; } /** * @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)override public { if (msg.sender != admin) { revert Unauthorized(); } if (allowResign) { delegateToImplementation(abi.encodeWithSignature("_resignImplementation()")); } address oldImplementation = implementation; implementation = implementation_; delegateToImplementation(abi.encodeWithSignature("_becomeImplementation(bytes)", becomeImplementationData)); emit NewImplementation(oldImplementation, implementation); } /** * @notice Collect the interest from supplied ERC721 tokens for the lender and adds them to his supply. * Must be called by the supply market. * @param lender The address for which the interest should be collected * @param interestTokens The amount of market tokens to claim * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function collectInterest(address lender, uint interestTokens) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("collectInterest(address,uint256)", lender, interestTokens)); return abi.decode(data, (uint)); } /** * @notice Pay the interest for borrowed ERC721 tokens. * Must be called by the borrow market. * @param payer The address that pays the interest * @param interestTokens The amount of market tokens to pay * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function payInterest(address payer, uint interestTokens) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("payInterest(address,uint256)", payer, interestTokens)); return abi.decode(data, (uint)); } /** * @notice Sender supplies assets into the market and receives cTokens in exchange * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param mintAmount The amount of the underlying asset to supply * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function mint(uint mintAmount) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("mint(uint256)", mintAmount)); return abi.decode(data, (uint)); } /** * @notice Sender redeems cTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of cTokens to redeem into underlying * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeem(uint redeemTokens) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("redeem(uint256)", redeemTokens)); return abi.decode(data, (uint)); } /** * @notice Sender redeems cTokens in exchange for a specified amount of underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemAmount The amount of underlying to redeem * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlying(uint redeemAmount) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("redeemUnderlying(uint256)", redeemAmount)); return abi.decode(data, (uint)); } /** * @notice Sender claims interest from NFT markets then redeems cTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of cTokens to redeem into underlying * @param cTokens The list of cToken addresses to redeem interest from. * Only possible for cErc721 markets. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemWithClaim(uint redeemTokens, address[] memory cTokens) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("redeemWithClaim(uint256,address[])", redeemTokens, cTokens)); return abi.decode(data, (uint)); } /** * @notice Sender claims interest from NFT markets then redeems cTokens in exchange for a specified amount of underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemAmount The amount of underlying to redeem * @param cTokens The list of cToken addresses to redeem interest from. * Only possible for cErc721 markets. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlyingWithClaim(uint redeemAmount, address[] memory cTokens) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("redeemUnderlyingWithClaim(uint256,address[])", redeemAmount, cTokens)); return abi.decode(data, (uint)); } /** * @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) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("borrow(uint256)", borrowAmount)); return abi.decode(data, (uint)); } /** * @notice Sender repays their own borrow * @param repayAmount The amount to repay, or -1 for the full outstanding amount * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function repayBorrow(uint repayAmount) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("repayBorrow(uint256)", repayAmount)); return abi.decode(data, (uint)); } /** * @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 -1 for the full outstanding amount * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function repayBorrowBehalf(address borrower, uint repayAmount) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("repayBorrowBehalf(address,uint256)", borrower, repayAmount)); return abi.decode(data, (uint)); } /** * @notice The liquidator liquidates the borrowers collateral. * This function can only be called by the Comptroller. * @param liquidator The liquidator who called Comptroller::batchLiquidateBorrow * @param borrower The borrower of this cToken to be liquidated * @param repayAmount The amount of the underlying borrowed asset to repay * @return uint The amount of the underlying borrowed asset that was actually repaid */ function _liquidateBorrow(address liquidator, address borrower, uint repayAmount) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_liquidateBorrow(address,address,uint256)", liquidator, borrower, repayAmount)); return abi.decode(data, (uint)); } /** * @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, uint amount) override external returns (bool) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("transfer(address,uint256)", dst, amount)); return abi.decode(data, (bool)); } /** * @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) override external returns (bool) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("transferFrom(address,address,uint256)", src, dst, amount)); return abi.decode(data, (bool)); } /** * @notice Approve `spender` to transfer up to `amount` from `src` * @dev This will overwrite the approval amount for `spender` * and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve) * @param spender The address of the account which may transfer tokens * @param amount The number of tokens that are approved (-1 means infinite) * @return Whether or not the approval succeeded */ function approve(address spender, uint256 amount) override external returns (bool) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("approve(address,uint256)", spender, amount)); return abi.decode(data, (bool)); } /** * @notice Get the current allowance from `owner` for `spender` * @param owner The address of the account which owns the tokens to be spent * @param spender The address of the account which may transfer tokens * @return The number of tokens allowed to be spent (-1 means infinite) */ function allowance(address owner, address spender) override external view returns (uint) { bytes memory data = delegateToViewImplementation(abi.encodeWithSignature("allowance(address,address)", owner, spender)); return abi.decode(data, (uint)); } /** * @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) override external view returns (uint) { bytes memory data = delegateToViewImplementation(abi.encodeWithSignature("balanceOf(address)", owner)); return abi.decode(data, (uint)); } /** * @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) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("balanceOfUnderlying(address)", owner)); return abi.decode(data, (uint)); } /** * @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 mantissav, borrow interest balance (always 0)) */ function getAccountSnapshot(address account) override external view returns (uint, uint, uint, uint, uint) { bytes memory data = delegateToViewImplementation(abi.encodeWithSignature("getAccountSnapshot(address)", account)); return abi.decode(data, (uint, uint, uint, uint, uint)); } /** * @notice Returns the current per-block borrow interest rate for this cToken * @return The borrow interest rate per block, scaled by 1e18 */ function borrowRatePerBlock() override external view returns (uint) { bytes memory data = delegateToViewImplementation(abi.encodeWithSignature("borrowRatePerBlock()")); return abi.decode(data, (uint)); } /** * @notice Returns the current per-block supply interest rate for this cToken * @return The supply interest rate per block, scaled by 1e18 */ function supplyRatePerBlock() override external view returns (uint) { bytes memory data = delegateToViewImplementation(abi.encodeWithSignature("supplyRatePerBlock()")); return abi.decode(data, (uint)); } /** * @notice Returns the current total borrows plus accrued interest * @return The total borrows with interest */ function totalBorrowsCurrent() override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("totalBorrowsCurrent()")); return abi.decode(data, (uint)); } /** * @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) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("borrowBalanceCurrent(address)", account)); return abi.decode(data, (uint)); } /** * @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) override public view returns (uint) { bytes memory data = delegateToViewImplementation(abi.encodeWithSignature("borrowBalanceStored(address)", account)); return abi.decode(data, (uint)); } /** * @notice Accrue interest then return the up-to-date exchange rate * @return Calculated exchange rate scaled by 1e18 */ function exchangeRateCurrent() override public returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("exchangeRateCurrent()")); return abi.decode(data, (uint)); } /** * @notice Calculates the exchange rate from the underlying to the CToken * @dev This function does not accrue interest before calculating the exchange rate * @return Calculated exchange rate scaled by 1e18 */ function exchangeRateStored() override public view returns (uint) { bytes memory data = delegateToViewImplementation(abi.encodeWithSignature("exchangeRateStored()")); return abi.decode(data, (uint)); } /** * @notice Get cash balance of this cToken in the underlying asset * @return The quantity of underlying asset owned by this contract */ function getCash() override external view returns (uint) { bytes memory data = delegateToViewImplementation(abi.encodeWithSignature("getCash()")); return abi.decode(data, (uint)); } /** * @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() override public returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("accrueInterest()")); return abi.decode(data, (uint)); } /** * @notice Transfers collateral tokens (this market) to the liquidator. * This function can only be called by the Comptroller. * @param liquidator The account receiving seized collateral * @param borrower The account having collateral seized * @param seizeTokens The number of cTokens to seize * @return uint actual seizeTokens */ function _seize(address liquidator, address borrower, uint seizeTokens) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_seize(address,address,uint256)", liquidator, borrower, seizeTokens)); return abi.decode(data, (uint)); } /** * @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) override external { delegateToImplementation(abi.encodeWithSignature("sweepToken(address)", token)); } /*** 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) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_setPendingAdmin(address)", newPendingAdmin)); return abi.decode(data, (uint)); } /** * @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) override public returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_setComptroller(address)", newComptroller)); return abi.decode(data, (uint)); } /** * @notice Sets protocolSeizeShareMantissa * @dev Admin function to set protocolSeizeShareMantissa * @param newProtocolSeizeShareMantissa New protocolSeizeShareMantissa scaled by 1e18 * @return uint 0=success, otherwise a failure. (See ErrorReporter for details) */ function _setProtocolSeizeShare(uint newProtocolSeizeShareMantissa) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_setProtocolSeizeShare(uint256)", newProtocolSeizeShareMantissa)); return abi.decode(data, (uint)); } /** * @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) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_setReserveFactor(uint256)", newReserveFactorMantissa)); return abi.decode(data, (uint)); } /** * @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() override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_acceptAdmin()")); return abi.decode(data, (uint)); } /** * @notice Accrues interest and adds reserves by transferring from admin * @param addAmount Amount of reserves to add * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _addReserves(uint addAmount) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_addReserves(uint256)", addAmount)); return abi.decode(data, (uint)); } /** * @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) override external returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_reduceReserves(uint256)", reduceAmount)); return abi.decode(data, (uint)); } /** * @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) override public returns (uint) { bytes memory data = delegateToImplementation(abi.encodeWithSignature("_setInterestRateModel(address)", newInterestRateModel)); return abi.decode(data, (uint)); } /** * @notice Internal method to delegate execution to another contract * @dev It returns to the external caller whatever the implementation returns or forwards reverts * @param callee The contract to delegatecall * @param data The raw data to delegatecall * @return The returned bytes from the delegatecall */ function delegateTo(address callee, bytes memory data) internal returns (bytes memory) { (bool success, bytes memory returnData) = callee.delegatecall(data); assembly { if eq(success, 0) { revert(add(returnData, 0x20), returndatasize()) } } return returnData; } /** * @notice Delegates execution to the implementation contract * @dev It returns to the external caller whatever the implementation returns or forwards reverts * @param data The raw data to delegatecall * @return The returned bytes from the delegatecall */ function delegateToImplementation(bytes memory data) public returns (bytes memory) { return delegateTo(implementation, data); } /** * @notice Delegates execution to an implementation contract * @dev It returns to the external caller whatever the implementation returns or forwards reverts * There are an additional 2 prefix uints from the wrapper returndata, which we ignore since we make an extra hop. * @param data The raw data to delegatecall * @return The returned bytes from the delegatecall */ function delegateToViewImplementation(bytes memory data) public view returns (bytes memory) { (bool success, bytes memory returnData) = address(this).staticcall(abi.encodeWithSignature("delegateToImplementation(bytes)", data)); assembly { if eq(success, 0) { revert(add(returnData, 0x20), returndatasize()) } } return abi.decode(returnData, (bytes)); } /** * @notice Delegates execution to an implementation contract * @dev It returns to the external caller whatever the implementation returns or forwards reverts */ fallback() external payable { if (msg.value != 0) { revert CannotReceiveValueGtZero(); } // delegate all other functions to current implementation (bool success, ) = implementation.delegatecall(msg.data); assembly { let free_mem_ptr := mload(0x40) returndatacopy(free_mem_ptr, 0, returndatasize()) switch success case 0 { revert(free_mem_ptr, returndatasize()) } default { return(free_mem_ptr, returndatasize()) } } } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; import "ComptrollerInterface.sol"; import "InterestRateModel.sol"; import "EIP20NonStandardInterface.sol"; import "ErrorReporter.sol"; contract CTokenStorage { /** * @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; // Maximum borrow rate that can ever be applied (.0005% / block) uint internal constant borrowRateMaxMantissa = 0.0005e16; // Maximum fraction of interest that can be set aside for reserves uint internal constant reserveFactorMaxMantissa = 1e18; // Maximum protocol seize share that can be set uint internal constant protocolSeizeShareMaxMantissa = 20e16; /** * @notice Administrator for this contract */ address payable public admin; /** * @notice Pending administrator for this contract */ address payable public pendingAdmin; /** * @notice Contract which oversees inter-cToken operations */ ComptrollerInterface public comptroller; /** * @notice Model which tells what the current interest rate should be */ InterestRateModel public interestRateModel; // Initial exchange rate used when minting the first CTokens (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 accrualBlockNumber; /** * @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; // Official record of token balances for each account mapping (address => uint) internal accountTokens; // 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 * @member interestAccrued Total interest accrued for markets that track it separately from borrow balance */ struct BorrowSnapshot { uint principal; uint interestIndex; uint interestAccrued; } // 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 = 2.8e16; //2.8% /** * @notice MarketType enum */ enum MarketType { UNDEFINED_MARKET, ERC20_MARKET, ERC721_MARKET, ERC20_INTEREST_MARKET } /** * @notice Indicates a token market type */ MarketType public marketType; } abstract contract CTokenInterface is CTokenStorage { /** * @notice Indicator that this is a CToken contract (for inspection) */ bool public constant isCToken = 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); /*** 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 seize share is changed */ event NewProtocolSeizeShare(uint oldProtocolSeizeShareMantissa, uint newProtocolSeizeShareMantissa); /** * @notice Event emitted when the reserve factor is changed */ event NewReserveFactor(uint oldReserveFactorMantissa, uint newReserveFactorMantissa); /** * @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) virtual external returns (bool); function transferFrom(address src, address dst, uint amount) virtual external returns (bool); function approve(address spender, uint amount) virtual external returns (bool); function allowance(address owner, address spender) virtual external view returns (uint); function balanceOf(address owner) virtual external view returns (uint); function balanceOfUnderlying(address owner) virtual external returns (uint); function getAccountSnapshot(address account) virtual external view returns (uint, uint, uint, uint, uint); function borrowRatePerBlock() virtual external view returns (uint); function supplyRatePerBlock() virtual external view returns (uint); function totalBorrowsCurrent() virtual external returns (uint); function borrowBalanceCurrent(address account) virtual external returns (uint); function borrowBalanceStored(address account) virtual external view returns (uint); function exchangeRateCurrent() virtual external returns (uint); function exchangeRateStored() virtual external view returns (uint); function getCash() virtual external view returns (uint); function accrueInterest() virtual external returns (uint); function _seize(address liquidator, address borrower, uint seizeTokens) virtual external returns (uint); function sweepToken(EIP20NonStandardInterface token) virtual external; /*** Admin Functions ***/ function _setPendingAdmin(address payable newPendingAdmin) virtual external returns (uint); function _acceptAdmin() virtual external returns (uint); function _setComptroller(ComptrollerInterface newComptroller) virtual external returns (uint); function _setProtocolSeizeShare(uint newProtocolSeizeShareMantissa) virtual external returns (uint); function _setReserveFactor(uint newReserveFactorMantissa) virtual external returns (uint); function _reduceReserves(uint reduceAmount) virtual external returns (uint); function _setInterestRateModel(InterestRateModel newInterestRateModel) virtual external returns (uint); } contract CErc20Storage { /** * @notice Underlying asset for this CToken */ address public underlying; } abstract contract CErc20Interface is CErc20Storage { /*** User Interface ***/ function mint(uint mintAmount) virtual external returns (uint); function redeem(uint redeemTokens) virtual external returns (uint); function redeemUnderlying(uint redeemAmount) virtual external returns (uint); function borrow(uint borrowAmount) virtual external returns (uint); function repayBorrow(uint repayAmount) virtual external returns (uint); function repayBorrowBehalf(address borrower, uint repayAmount) virtual external returns (uint); function _liquidateBorrow(address liquidator, address borrower, uint repayAmount) virtual external returns (uint); /*** Admin Functions ***/ function _addReserves(uint addAmount) virtual external returns (uint); } interface IWeth { function transferFrom(address src, address dst, uint wad) external; function withdraw(uint256 wad) external; } abstract contract CEtherInterface is CErc20Storage { /*** User Interface ***/ function mint() virtual external payable; function redeem(uint redeemTokens) virtual external returns (uint); function redeemUnderlying(uint redeemAmount) virtual external returns (uint); function borrow(uint borrowAmount) virtual external returns (uint); function repayBorrow() virtual external payable; function repayBorrowBehalf(address borrower) virtual external payable; function _liquidateBorrow(address liquidator, address borrower, uint repayAmount) virtual external returns (uint); /*** Admin Functions ***/ function _addReserves() virtual external payable returns (uint); } contract CDelegationStorage { /** * @notice Implementation address for this contract */ address public implementation; } abstract contract CDelegatorInterface is CDelegationStorage { /** * @notice Emitted when implementation is changed */ event NewImplementation(address oldImplementation, address newImplementation); error CannotReceiveValueGtZero(); /** * @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) virtual external; } abstract contract CDelegateInterface is CDelegationStorage { /** * @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) virtual external; /** * @notice Called by the delegator on a delegate to forfeit its responsibility */ function _resignImplementation() virtual external; }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; abstract contract ComptrollerInterface { /// @notice Indicator that this is a Comptroller contract (for inspection) bool public constant isComptroller = true; /*** Assets You Are In ***/ function autoEnterMarkets(address account) virtual external; function autoExitMarkets(address account) virtual external; function enterMarkets(address[] calldata cTokens) virtual external returns (uint[] memory); function exitMarket(address cToken) virtual external returns (uint); function redeemAllInterest(address lender, address[] memory cTokens) virtual external returns (uint[] memory); /*** Policy Hooks ***/ function mintAllowed(address cToken, address minter, uint mintAmount) virtual external returns (uint); function redeemAllowed(address cToken, address redeemer, uint redeemTokens) virtual external returns (uint); function borrowAllowed(address cToken, address borrower, uint borrowAmount) virtual external returns (uint); function repayBorrowAllowed( address cToken, address payer, address borrower, uint repayAmount) virtual external returns (uint); function collectInterestAllowed( address cTokenInterestMarket, address cTokenSupplyMarket, address lender, uint interestAmount) virtual external returns (uint); function payInterestAllowed( address cTokenInterestMarket, address cTokenBorrowMarket, address payer, uint payTokens) virtual external returns (uint); function transferAllowed(address cToken, address src, address dst, uint transferTokens) virtual external returns (uint); function isListed(address cToken) virtual external view returns (bool); function getAssetsExchangeRate(address cTokenA, address cTokenB) virtual external view returns (uint); function _checkEoaOrWL(address msgSender) virtual external view returns (bool); /*** Liquidity/Liquidation Calculations ***/ struct Liquidatables { address cToken; // token to liquidate uint amount; // non-NFT markets uint[] nftIds; // NFT markets } function topUpInterestShortfall(address borrower, uint maxTopUpTokens, address cTokenCollateral) virtual external returns (uint[2] memory); function batchLiquidateBorrow(address borrower, Liquidatables[] memory liquidatables, address[] memory cTokenCollaterals, uint minSeizedValue) virtual external returns (uint[][2] memory results); function liquidateCalculateSeizeTokensNormed(address cTokenCollateral, uint normedRepayAmount) virtual public view returns (uint); function interestMarket() virtual external view returns (address); }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; /** * @title Compound's InterestRateModel Interface * @author Compound */ 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 block * @param cash The total amount of cash the market has * @param borrows The total amount of borrows the market has outstanding * @param reserves The total amount of reserves the market has * @return The borrow rate per block (as a percentage, and scaled by 1e18) */ function getBorrowRate(uint cash, uint borrows, uint reserves) virtual public view returns (uint); /** * @notice Calculates the current supply interest rate per block * @param cash The total amount of cash the market has * @param borrows The total amount of borrows the market has outstanding * @param reserves The total amount of reserves the market has * @param reserveFactorMantissa The current reserve factor the market has * @return The supply rate per block (as a percentage, and scaled by 1e18) */ function getSupplyRate(uint cash, uint borrows, uint reserves, uint reserveFactorMantissa) virtual public view returns (uint); /** * @notice Calculates the current borrow and supply rate per block * @param cash The amount of cash in the market * @param borrows The amount of borrows in the market * @param reserves The amount of reserves in the market * @param reserveFactorMantissa The current reserve factor for the market * @return (uint, uint) The borrow rate percentage per block as a mantissa (scaled by BASE), * supply rate percentage per block as a mantissa (scaled by BASE) */ function getMarketRates(uint cash, uint borrows, uint reserves, uint reserveFactorMantissa) virtual public view returns (uint, uint) { return (getBorrowRate(cash, borrows, reserves), getSupplyRate(cash, borrows, reserves, reserveFactorMantissa)); } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; /** * @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 0.8.23; 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, INVALID_MARKET_TYPE, TOO_LITTLE_INTEREST_RESERVE, NONZERO_INTEREST_BALANCE, LIQUIDATE_SEIZE_TOO_LITTLE } enum FailureInfo { ACCEPT_ADMIN_PENDING_ADMIN_CHECK, ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK, EXIT_MARKET_BALANCE_OWED, EXIT_MARKET_REJECTION, SET_CLOSE_FACTOR_OWNER_CHECK, SET_CLOSE_FACTOR_VALIDATION, SET_COLLATERAL_FACTOR_OWNER_CHECK, SET_COLLATERAL_FACTOR_NO_EXISTS, SET_COLLATERAL_FACTOR_VALIDATION, SET_COLLATERAL_FACTOR_WITHOUT_PRICE, SET_IMPLEMENTATION_OWNER_CHECK, SET_LIQUIDATION_INCENTIVE_OWNER_CHECK, SET_LIQUIDATION_INCENTIVE_VALIDATION, SET_MAX_ASSETS_OWNER_CHECK, SET_PENDING_ADMIN_OWNER_CHECK, SET_PENDING_IMPLEMENTATION_OWNER_CHECK, SET_PRICE_ORACLE_OWNER_CHECK, SUPPORT_MARKET_EXISTS, SUPPORT_MARKET_OWNER_CHECK, SET_PAUSE_GUARDIAN_OWNER_CHECK } /** * @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary * contract-specific code that enables us to report opaque error codes from upgradeable contracts. **/ event Failure(uint error, uint info, uint detail); error Unauthorized(); error InitializationFailed(); error GetAccountSnapshotFailed(uint256 errorCode); error SeizePaused(); error MintPaused(); error BorrowPaused(); error CollectInterestPaused(); error PayInterestPaused(); error TransferPaused(); error InsufficientShortfall(uint errorCode, uint value); error InvalidTopUpLimit(); error TopUpLimitExceeded(); error TopUpZero(); error SeizeFailed(); error TopUpFailed(); error LiquidateError(); error LiquidateSeizeTooLittle(); error LiquidateSeizeTooMuch(); error LiquidateSeizeBellowMinValue(uint minSeizedValue, uint liquidatedValueTotal); error ExcessRefundFailed(); error BorrowCapReached(); error MarketAlreadyAdded(); error InvalidInput(); error OnlyAdminCanUnpause(); error ChangeNotAuthorized(); error MarketNotListed(); error SameMarket(); error WrongMarketType(); error PriceError(); error ComptrollerMismatch(); error InvalidMarket(); /** * @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 { uint public constant NO_ERROR = 0; // support legacy return codes error Unauthorized(); error Unsupported(); error AlreadyInitialized(); error InitializeExchangeRateInvalid(); error InitializeSetComptrollerFailed(uint256 errorCode); error InitializeSetInterestRateModelFailed(uint256 errorCode); error InitializeMarketTypeNotSet(); error InitializeInvalidMarketType(); error EnsureNonEmptyAmountTooSmall(); error TransferComptrollerRejection(uint256 errorCode); error TransferNotAllowed(); error TransferNotEnough(); error TransferTooMuch(); error TransferInvalidAmount(); error TransferInFailed(); error InsufficientBalanceAfterTransfer(); error TransferOutFailed(); error MintComptrollerRejection(uint256 errorCode); error MintFreshnessCheck(); error RedeemComptrollerRejection(uint256 errorCode); error RedeemFreshnessCheck(); error RedeemTransferOutNotPossible(); error RedeemInvalidInputs(); error BorrowComptrollerRejection(uint256 errorCode); error BorrowFreshnessCheck(); error BorrowCashNotAvailable(); error RepayBorrowComptrollerRejection(uint256 errorCode); error RepayBorrowFreshnessCheck(); error RepayTooHigh(); error LiquidateComptrollerRejection(uint256 errorCode); error LiquidateFreshnessCheck(); error LiquidateCollateralFreshnessCheck(); error LiquidateAccrueBorrowInterestFailed(uint256 errorCode); error LiquidateAccrueCollateralInterestFailed(uint256 errorCode); error LiquidateLiquidatorIsBorrower(); error LiquidateCloseAmountIsZero(); error LiquidateCloseAmountIsUintMax(); error LiquidateRepayBorrowFreshFailed(uint256 errorCode); error LiquidateSeizeComptrollerRejection(uint256 errorCode); error LiquidateSeizeLiquidatorIsBorrower(); error AcceptAdminPendingAdminCheck(); error SetComptrollerOwnerCheck(); error SetPendingAdminOwnerCheck(); error SetReserveFactorAdminCheck(); error SetReserveFactorFreshCheck(); error SetReserveFactorBoundsCheck(); error AddReservesFactorFreshCheck(uint256 actualAddAmount); error ReduceReservesAdminCheck(); error ReduceReservesFreshCheck(); error ReduceReservesCashNotAvailable(); error ReduceReservesCashValidation(); error SetInterestRateModelOwnerCheck(); error SetInterestRateModelFreshCheck(); error SetProtocolSeizeShareAdminCheck(); error SetProtocolSeizeShareTooHigh(); error BorrowRateIsAbsurdlyHigh(uint borrowRateMantissa); error InvalidComptrollerAddress(address comptrollerAddress); error InvalidRateModelAddress(address interestRateModelAddress); error Reentry(); error CannotSweepUnderlying(); error CollectInterestFailed(); error CollectInterestNotAllowed(); error PayInterestNotAllowed(); error InsufficientBalance(); error PayInterestError(); error SenderMismatch(); error ValueMismatch(); error PriceError(); }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; import "CErc20.sol"; import "CErc20InterestMarketInterfaces.sol"; contract CErc20InterestMarket is CErc20, CErc20InterestMarketInterface { function initialize(address underlying_, ComptrollerInterface comptroller_, InterestRateModel interestRateModel_, uint initialExchangeRateMantissa_, string memory name_, string memory symbol_, uint8 decimals_) public { super.initialize(underlying_, comptroller_, interestRateModel_, initialExchangeRateMantissa_, name_, symbol_, decimals_, CTokenStorage.MarketType.ERC20_INTEREST_MARKET); } /** * @notice Collect the interest from supplied ERC721 tokens for the lender and adds them to his supply. * Must be called by the supply market. * @param lender The address for which the interest should be collected * @param interestTokens The amount of market tokens to claim * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function collectInterest(address lender, uint interestTokens) override external nonReentrant returns (uint) { accrueInterest(); collectInterestInternal(msg.sender, lender, interestTokens); return NO_ERROR; } /** * @notice Collect the interest from supplied ERC721 tokens for the lender and adds them to his supply. * @param supplyMarket The market on which the interest accrued * @param lender The address for which the interest should be collected * @param interestTokens The amount of market tokens to claim */ function collectInterestInternal(address supplyMarket, address lender, uint interestTokens) internal { if (interestTokens == 0) { return; } /* Fail if collect interest not allowed */ uint allowed = comptroller.collectInterestAllowed(address(this), supplyMarket, lender, interestTokens); if (allowed != 0) { revert CollectInterestNotAllowed(); } uint remainingTokens; uint heldBalance = accountTokens[address(this)]; if (heldBalance > interestTokens) { accountTokens[address(this)] = heldBalance - interestTokens; emit Transfer(address(this), address(0), interestTokens); } else { accountTokens[address(this)] = 0; emit Transfer(address(this), address(0), heldBalance); remainingTokens = interestTokens - heldBalance; } if (remainingTokens != 0) { /* We artificially inflate the supply with a virtual balance */ totalSupply = totalSupply + remainingTokens; totalVirtual = totalVirtual + remainingTokens; } accountTokens[lender] = accountTokens[lender] + interestTokens; emit Transfer(address(0), lender, interestTokens); } /** * @notice Pay the interest for borrowed ERC721 tokens. * Must be called by the borrow market. * @param payer The address that pays the interest * @param interestTokens The amount of market tokens to pay * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function payInterest(address payer, uint interestTokens) override external nonReentrant returns (uint) { accrueInterest(); payInterestInternal(msg.sender, payer, interestTokens); return NO_ERROR; } /** * @notice Pay the interest for borrowed ERC721 tokens. * @param borrowMarket The market on which the interest accrued * @param payer The address that pays the interest * @param interestTokens The amount of market tokens to pay */ function payInterestInternal(address borrowMarket, address payer, uint interestTokens) internal { if (interestTokens == 0) { return; } // payer interest market balance is reduced to cover interest being paid uint balancePayer = accountTokens[payer]; if (balancePayer < interestTokens) { revert InsufficientBalance(); } /* Fail if pay interest not allowed */ uint allowed = comptroller.payInterestAllowed(address(this), borrowMarket, payer, interestTokens); if (allowed != 0) { revert PayInterestNotAllowed(); } accountTokens[payer] = balancePayer - interestTokens; emit Transfer(payer, address(0), interestTokens); uint totalVirtual_ = totalVirtual; uint heldBalance; if (interestTokens > totalVirtual_) { heldBalance = interestTokens - totalVirtual_; totalSupply = totalSupply - totalVirtual_; totalVirtual = 0; } else { totalSupply = totalSupply - interestTokens; totalVirtual = totalVirtual_ - interestTokens; } if (heldBalance != 0) { // keep a reserve of cToken accountTokens[address(this)] = accountTokens[address(this)] + heldBalance; emit Transfer(address(0), address(this), heldBalance); } } /** * @notice Sender claims interest from NFT markets then redeems cTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of cTokens to redeem into underlying * @param cTokens The list of cToken addresses to redeem interest from. * Only possible for cErc721 markets. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemWithClaim(uint redeemTokens, address[] memory cTokens) override external returns (uint) { comptroller.redeemAllInterest(msg.sender, cTokens); redeemInternal(redeemTokens); return NO_ERROR; } /** * @notice Sender claims interest from NFT markets then redeems cTokens in exchange for a specified amount of underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemAmount The amount of underlying to redeem * @param cTokens The list of cToken addresses to redeem interest from. * Only possible for cErc721 markets. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlyingWithClaim(uint redeemAmount, address[] memory cTokens) override external returns (uint) { comptroller.redeemAllInterest(msg.sender, cTokens); redeemUnderlyingInternal(redeemAmount); return NO_ERROR; } /** * @notice Calculates the exchange rate from the underlying to the CToken * @dev This function does not accrue interest before calculating the exchange rate * @return calculated exchange rate scaled by 1e18 */ function exchangeRateStoredInternal() override internal view returns (uint) { uint _totalSupply = totalSupply; uint _totalVirtual = totalVirtual; // it should be impossible for totalVirtual to be greater than totalSupply assert(_totalSupply >= _totalVirtual); _totalSupply = _totalSupply - _totalVirtual; if (_totalSupply == 0) { /* * If there are no tokens minted: * exchangeRate = initialExchangeRate */ return initialExchangeRateMantissa; } else { /* * Otherwise: * exchangeRate = (totalCash + totalBorrows - totalReserves) / totalSupply */ uint totalCash = getCashPrior(); uint cashPlusBorrowsMinusReserves = totalCash + totalBorrows - totalReserves; uint exchangeRate = cashPlusBorrowsMinusReserves * expScale / _totalSupply; return exchangeRate; } } /** * @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) override external { if (msg.sender != admin) { revert Unauthorized(); } if (address(token) == underlying || address(token) == address(this)) { revert CannotSweepUnderlying(); } uint256 balance = token.balanceOf(address(this)); token.transfer(admin, balance); } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; import "CToken.sol"; /** * @title Compound's CErc20 Contract * @notice CTokens which wrap an EIP-20 underlying * @author Compound */ contract CErc20 is CToken, CErc20Interface { /** * @notice Initialize the new money market * @param underlying_ The address of the underlying asset * @param comptroller_ The address of the Comptroller * @param interestRateModel_ The address of the interest rate model * @param initialExchangeRateMantissa_ The initial exchange rate, scaled by 1e18 * @param name_ ERC-20 name of this token * @param symbol_ ERC-20 symbol of this token * @param decimals_ ERC-20 decimal precision of this token * @param marketType_ MarketType enum of the token */ function initialize(address underlying_, ComptrollerInterface comptroller_, InterestRateModel interestRateModel_, uint initialExchangeRateMantissa_, string memory name_, string memory symbol_, uint8 decimals_, MarketType marketType_) virtual public { if (marketType_ != CTokenStorage.MarketType.ERC20_MARKET && marketType_ != CTokenStorage.MarketType.ERC20_INTEREST_MARKET) { revert InitializeInvalidMarketType(); } marketType = marketType_; // CToken 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 cTokens in exchange * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param mintAmount The amount of the underlying asset to supply * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function mint(uint mintAmount) override external returns (uint) { comptroller.autoEnterMarkets(msg.sender); // silent failure allowed mintInternal(mintAmount); return NO_ERROR; } /** * @notice Sender redeems cTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of cTokens to redeem into underlying * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeem(uint redeemTokens) override external returns (uint) { redeemInternal(redeemTokens); return NO_ERROR; } /** * @notice Sender redeems cTokens in exchange for a specified amount of underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemAmount The amount of underlying to redeem * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlying(uint redeemAmount) override external returns (uint) { redeemUnderlyingInternal(redeemAmount); return NO_ERROR; } /** * @notice Sender borrows assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function borrow(uint borrowAmount) override external returns (uint) { comptroller.autoEnterMarkets(msg.sender); // silent failure allowed borrowInternal(borrowAmount); return NO_ERROR; } /** * @notice Sender repays their own borrow * @param repayAmount The amount to repay, or -1 for the full outstanding amount * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function repayBorrow(uint repayAmount) override external returns (uint) { repayBorrowInternal(repayAmount); return NO_ERROR; } /** * @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 -1 for the full outstanding amount * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function repayBorrowBehalf(address borrower, uint repayAmount) override external returns (uint) { repayBorrowBehalfInternal(borrower, repayAmount); return NO_ERROR; } /** * @notice The liquidator liquidates the borrowers collateral. * This function can only be called by the Comptroller. * @param liquidator The liquidator who called Comptroller::batchLiquidateBorrow * @param borrower The borrower of this cToken to be liquidated * @param repayAmount The amount of the underlying borrowed asset to repay * @return uint The amount of the underlying borrowed asset that was actually repaid */ function _liquidateBorrow(address liquidator, address borrower, uint repayAmount) override external returns (uint) { return _liquidateBorrowInternal(liquidator, borrower, repayAmount); } /** * @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) virtual override external { if (msg.sender != admin) { revert Unauthorized(); } if (address(token) == underlying) { revert CannotSweepUnderlying(); } 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) override external 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() virtual override internal view 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) virtual override internal 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 override external call } default { // This is an excessively non-compliant ERC-20, revert. revert(0, 0) } } if (!success) { revert TransferInFailed(); } // Calculate the amount that was *actually* transferred uint balanceAfter = EIP20Interface(underlying_).balanceOf(address(this)); 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) virtual override internal { EIP20NonStandardInterface token = EIP20NonStandardInterface(underlying); token.transfer(to, amount); bool success; assembly { switch returndatasize() case 0 { // This is a non-standard ERC-20 success := not(0) // set success to true } case 32 { // This is a 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) } } if (!success) { revert TransferOutFailed(); } } // called only once by the comptroller during _supportMarket function _ensureNonEmpty(address minter, uint amount) virtual override external { _ensureNonEmptyInternal(minter, amount); } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; import "ComptrollerInterface.sol"; import "CTokenInterfaces.sol"; import "ErrorReporter.sol"; import "EIP20Interface.sol"; import "InterestRateModel.sol"; import "ExponentialNoError.sol"; /** * @title Compound's CToken Contract * @notice Abstract base for CTokens * @author Compound */ abstract contract CToken is CTokenInterface, ExponentialNoError, 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_) virtual public { if (msg.sender != admin) { revert Unauthorized(); } if (accrualBlockNumber != 0 || borrowIndex != 0) { revert AlreadyInitialized(); } // Set initial exchange rate initialExchangeRateMantissa = initialExchangeRateMantissa_; if (initialExchangeRateMantissa == 0) { revert InitializeExchangeRateInvalid(); } // Set the comptroller uint err = _setComptroller(comptroller_); if (err != NO_ERROR) { revert InitializeSetComptrollerFailed(err); } // Initialize block number and borrow index (block number mocks depend on comptroller being set) accrualBlockNumber = getBlockNumber(); borrowIndex = mantissaOne; // Set the interest rate model (depends on block number / borrow index) err = _setInterestRateModelFresh(interestRateModel_); if (err != NO_ERROR) { revert InitializeSetInterestRateModelFailed(err); } 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; if (marketType == CTokenStorage.MarketType.UNDEFINED_MARKET) { revert InitializeMarketTypeNotSet(); } } /** * @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 0 if the transfer succeeded, else revert */ function transferTokens(address spender, address src, address dst, uint tokens) virtual internal returns (uint) { /* Fail if transfer not allowed */ uint allowed = comptroller.transferAllowed(address(this), src, dst, tokens); if (allowed != 0) { revert TransferComptrollerRejection(allowed); } /* Do not allow self-transfers */ if (src == dst) { revert TransferNotAllowed(); } /* 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 */ uint allowanceNew = startingAllowance - tokens; uint srcTokensNew = accountTokens[src] - tokens; uint dstTokensNew = accountTokens[dst] + tokens; ///////////////////////// // 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); return 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) override external nonReentrant returns (bool) { return transferTokens(msg.sender, msg.sender, dst, amount) == 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) override external nonReentrant returns (bool) { return transferTokens(msg.sender, src, dst, amount) == 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 (uint256.max means infinite) * @return Whether or not the approval succeeded */ function approve(address spender, uint256 amount) override external returns (bool) { address src = msg.sender; transferAllowances[src][spender] = amount; emit Approval(src, spender, amount); return true; } /** * @notice Get the current allowance from `owner` for `spender` * @param owner The address of the account which owns the tokens to be spent * @param spender The address of the account which may transfer tokens * @return The number of tokens allowed to be spent (-1 means infinite) */ function allowance(address owner, address spender) override external view returns (uint256) { return transferAllowances[owner][spender]; } /** * @notice Get the token balance of the `owner` * @param owner The address of the account to query * @return The number of tokens owned by `owner` */ function balanceOf(address owner) override external view returns (uint256) { return accountTokens[owner]; } /** * @notice Get the underlying balance of the `owner` * @dev This also accrues interest in a transaction * @param owner The address of the account to query * @return The amount of underlying owned by `owner` */ function balanceOfUnderlying(address owner) override external returns (uint) { Exp memory exchangeRate = Exp({mantissa: exchangeRateCurrent()}); return mul_ScalarTruncate(exchangeRate, accountTokens[owner]); } /** * @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, borrow interest balance (always 0)) */ function getAccountSnapshot(address account) virtual override external view returns (uint, uint, uint, uint, uint) { return ( NO_ERROR, accountTokens[account], borrowBalanceStoredInternal(account), exchangeRateStoredInternal(), 0 ); } /** * @dev Function to simply retrieve block number * This exists mainly for inheriting test contracts to stub this result. */ function getBlockNumber() virtual internal view returns (uint) { return block.number; } /** * @notice Returns the current per-block borrow interest rate for this cToken * @return The borrow interest rate per block, scaled by 1e18 */ function borrowRatePerBlock() override external view returns (uint) { return interestRateModel.getBorrowRate(getCashPrior(), totalBorrows, totalReserves); } /** * @notice Returns the current per-block supply interest rate for this cToken * @return The supply interest rate per block, scaled by 1e18 */ function supplyRatePerBlock() override external view returns (uint) { return interestRateModel.getSupplyRate(getCashPrior(), totalBorrows, totalReserves, reserveFactorMantissa); } /** * @notice Returns the current total borrows plus accrued interest * @return The total borrows with interest */ function totalBorrowsCurrent() override external nonReentrant returns (uint) { accrueInterest(); 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) override external nonReentrant returns (uint) { accrueInterest(); 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) override public view returns (uint) { return borrowBalanceStoredInternal(account); } /** * @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) virtual internal view returns (uint) { /* 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 0; } /* Calculate new borrow balance using the interest index: * recentBorrowBalance = borrower.borrowBalance * market.borrowIndex / borrower.borrowIndex */ uint principalTimesIndex = borrowSnapshot.principal * borrowIndex; return principalTimesIndex / borrowSnapshot.interestIndex; } /** * @notice Accrue interest then return the up-to-date exchange rate * @return Calculated exchange rate scaled by 1e18 */ function exchangeRateCurrent() override public nonReentrant returns (uint) { accrueInterest(); return exchangeRateStored(); } /** * @notice Calculates the exchange rate from the underlying to the CToken * @dev This function does not accrue interest before calculating the exchange rate * @return Calculated exchange rate scaled by 1e18 */ function exchangeRateStored() override public view returns (uint) { return exchangeRateStoredInternal(); } /** * @notice Calculates the exchange rate from the underlying to the CToken * @dev This function does not accrue interest before calculating the exchange rate * @return calculated exchange rate scaled by 1e18 */ function exchangeRateStoredInternal() virtual internal view returns (uint) { uint _totalSupply = totalSupply; if (_totalSupply == 0) { /* * If there are no tokens minted: * exchangeRate = initialExchangeRate */ return initialExchangeRateMantissa; } else { /* * Otherwise: * exchangeRate = (totalCash + totalBorrows - totalReserves) / totalSupply */ uint totalCash = getCashPrior(); uint cashPlusBorrowsMinusReserves = totalCash + totalBorrows - totalReserves; uint exchangeRate = cashPlusBorrowsMinusReserves * expScale / _totalSupply; return exchangeRate; } } /** * @notice Get cash balance of this cToken in the underlying asset * @return The quantity of underlying asset owned by this contract */ function getCash() override external view returns (uint) { return getCashPrior(); } /** * @notice Applies accrued interest to total borrows and reserves * @dev This calculates interest accrued from the last checkpointed block * up to the current block and writes new checkpoint to storage. */ function accrueInterest() virtual override public returns (uint) { /* Remember the initial block number */ uint currentBlockNumber = getBlockNumber(); uint accrualBlockNumberPrior = accrualBlockNumber; /* Short-circuit accumulating 0 interest */ if (accrualBlockNumberPrior == currentBlockNumber) { return 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); if (borrowRateMantissa > borrowRateMaxMantissa) { revert BorrowRateIsAbsurdlyHigh(borrowRateMantissa); } /* Calculate the number of blocks elapsed since the last accrual */ uint blockDelta = currentBlockNumber - accrualBlockNumberPrior; /* * 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 = mul_(Exp({mantissa: borrowRateMantissa}), blockDelta); uint interestAccumulated = mul_ScalarTruncate(simpleInterestFactor, borrowsPrior); uint totalBorrowsNew = interestAccumulated + borrowsPrior; uint totalReservesNew = mul_ScalarTruncateAddUInt(Exp({mantissa: reserveFactorMantissa}), interestAccumulated, reservesPrior); uint borrowIndexNew = mul_ScalarTruncateAddUInt(simpleInterestFactor, borrowIndexPrior, borrowIndexPrior); ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* We write the previously calculated values into storage */ accrualBlockNumber = currentBlockNumber; borrowIndex = borrowIndexNew; totalBorrows = totalBorrowsNew; totalReserves = totalReservesNew; /* We emit an AccrueInterest event */ emit AccrueInterest(cashPrior, interestAccumulated, borrowIndexNew, totalBorrowsNew); return NO_ERROR; } /** * @notice Sender supplies assets into the market and receives cTokens in exchange * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param mintAmount The amount of the underlying asset to supply */ function mintInternal(uint mintAmount) internal nonReentrantWL { accrueInterest(); // mintFresh emits the actual Mint event if successful and logs on errors, so we don't need to mintFresh(msg.sender, mintAmount); } /** * @notice User supplies assets into the market and receives cTokens in exchange * @dev Assumes interest has already been accrued up to the current block * @param minter The address of the account which is supplying the assets * @param mintAmount The amount of the underlying asset to supply */ function mintFresh(address minter, uint mintAmount) internal { /* Fail if mint not allowed */ uint allowed = comptroller.mintAllowed(address(this), minter, mintAmount); if (allowed != 0) { revert MintComptrollerRejection(allowed); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { revert MintFreshnessCheck(); } Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal()}); ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We call `doTransferIn` for the minter and the mintAmount. * Note: The cToken must handle variations between ERC-20 and ETH 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 cToken holds an additional `actualMintAmount` * of cash. */ uint actualMintAmount = doTransferIn(minter, mintAmount); /* * We get the current exchange rate and calculate the number of cTokens to be minted: * mintTokens = actualMintAmount / exchangeRate */ uint mintTokens = div_(actualMintAmount, exchangeRate); /* * We calculate the new total supply of cTokens and minter token balance, checking for overflow: * totalSupplyNew = totalSupply + mintTokens * accountTokensNew = accountTokens[minter] + mintTokens * And write them into storage */ totalSupply = totalSupply + mintTokens; accountTokens[minter] = accountTokens[minter] + mintTokens; /* We emit a Mint event, and a Transfer event */ emit Mint(minter, actualMintAmount, mintTokens); emit Transfer(address(this), minter, mintTokens); } /** * @notice Sender redeems cTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of cTokens to redeem into underlying */ function redeemInternal(uint redeemTokens) internal nonReentrantWL { accrueInterest(); // redeemFresh emits redeem-specific logs on errors, so we don't need to redeemFresh(payable(msg.sender), redeemTokens, 0); } /** * @notice Sender redeems cTokens in exchange for a specified amount of underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemAmount The amount of underlying to receive from redeeming cTokens */ function redeemUnderlyingInternal(uint redeemAmount) internal nonReentrantWL { accrueInterest(); // redeemFresh emits redeem-specific logs on errors, so we don't need to redeemFresh(payable(msg.sender), 0, redeemAmount); } /** * @notice User redeems cTokens in exchange for the underlying asset * @dev Assumes interest has already been accrued up to the current block * @param redeemer The address of the account which is redeeming the tokens * @param redeemTokensIn The number of cTokens to redeem into underlying (only one of redeemTokensIn or redeemAmountIn may be non-zero) * @param redeemAmountIn The number of underlying tokens to receive from redeeming cTokens (only one of redeemTokensIn or redeemAmountIn may be non-zero) */ function redeemFresh(address payable redeemer, uint redeemTokensIn, uint redeemAmountIn) internal virtual { // Fail if both redeemTokensIn and redeemAmountIn are non-zero if (redeemTokensIn != 0 && redeemAmountIn != 0) { revert RedeemInvalidInputs(); } /* exchangeRate = invoke Exchange Rate Stored() */ Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal() }); uint redeemTokens; uint redeemAmount; /* 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 */ redeemTokens = redeemTokensIn; redeemAmount = mul_ScalarTruncate(exchangeRate, redeemTokensIn); } else { /* * We get the current exchange rate and calculate the amount to be redeemed: * redeemTokens = redeemAmountIn / exchangeRate * redeemAmount = redeemAmountIn */ redeemTokens = div_(redeemAmountIn, exchangeRate); redeemAmount = redeemAmountIn; } /* Fail if redeem not allowed */ uint allowed = comptroller.redeemAllowed(address(this), redeemer, redeemTokens); if (allowed != 0) { revert RedeemComptrollerRejection(allowed); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { revert RedeemFreshnessCheck(); } /* Fail gracefully if protocol has insufficient cash */ if (getCashPrior() < redeemAmount) { revert RedeemTransferOutNotPossible(); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We write the previously calculated values into storage. * Note: Avoid token reentrancy attacks by writing reduced supply before external transfer. */ totalSupply = totalSupply - redeemTokens; uint accountTokensNew = accountTokens[redeemer] - redeemTokens; accountTokens[redeemer] = accountTokensNew; /* * We invoke doTransferOut for the redeemer and the redeemAmount. * Note: The cToken must handle variations between ERC-20 and ETH underlying. * On success, the cToken has redeemAmount less of cash. * doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred. */ doTransferOut(redeemer, redeemAmount); /* We emit a Transfer event, and a Redeem event */ emit Transfer(redeemer, address(this), redeemTokens); emit Redeem(redeemer, redeemAmount, redeemTokens); // Require tokens is zero or amount is also zero (defense check) if (redeemTokens == 0 && redeemAmount > 0) { revert("redeemTokens zero"); } if (accountTokensNew == 0 && borrowBalanceStoredInternal(redeemer) == 0) { comptroller.autoExitMarkets(redeemer); // silent failure allowed } } /** * @notice Sender borrows assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow */ function borrowInternal(uint borrowAmount) internal nonReentrantWL { accrueInterest(); // borrowFresh emits borrow-specific logs on errors, so we don't need to borrowFresh(payable(msg.sender), borrowAmount); } /** * @notice Users borrow assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow */ function borrowFresh(address payable borrower, uint borrowAmount) internal virtual { /* Fail if borrow not allowed */ uint allowed = comptroller.borrowAllowed(address(this), borrower, borrowAmount); if (allowed != 0) { revert BorrowComptrollerRejection(allowed); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { revert BorrowFreshnessCheck(); } /* Fail gracefully if protocol has insufficient underlying cash */ if (getCashPrior() < borrowAmount) { revert BorrowCashNotAvailable(); } /* * We calculate the new borrower and total borrow balances, failing on overflow: * accountBorrowNew = accountBorrow + borrowAmount * totalBorrowsNew = totalBorrows + borrowAmount */ uint accountBorrowsPrev = borrowBalanceStoredInternal(borrower); uint accountBorrowsNew = accountBorrowsPrev + borrowAmount; uint totalBorrowsNew = totalBorrows + borrowAmount; ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We write the previously calculated values into storage. * Note: Avoid token reentrancy attacks by writing increased borrow before external transfer. `*/ accountBorrows[borrower].principal = accountBorrowsNew; accountBorrows[borrower].interestIndex = borrowIndex; totalBorrows = totalBorrowsNew; /* * We invoke doTransferOut for the borrower and the borrowAmount. * Note: The cToken must handle variations between ERC-20 and ETH underlying. * On success, the cToken borrowAmount less of cash. * doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred. */ doTransferOut(borrower, borrowAmount); /* We emit a Borrow event */ emit Borrow(borrower, borrowAmount, accountBorrowsNew, totalBorrowsNew); } /** * @notice Sender repays their own borrow * @param repayAmount The amount to repay, or -1 for the full outstanding amount */ function repayBorrowInternal(uint repayAmount) internal nonReentrantWL { accrueInterest(); // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to 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, or -1 for the full outstanding amount */ function repayBorrowBehalfInternal(address borrower, uint repayAmount) internal nonReentrantWL { accrueInterest(); // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to repayBorrowFresh(msg.sender, borrower, repayAmount); } /** * @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, or -1 for the full outstanding amount * @return (uint) the actual repayment amount. */ function repayBorrowFresh(address payer, address borrower, uint repayAmount) internal virtual returns (uint) { /* Fail if repayBorrow not allowed */ uint allowed = comptroller.repayBorrowAllowed(address(this), payer, borrower, repayAmount); if (allowed != 0) { revert RepayBorrowComptrollerRejection(allowed); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { revert RepayBorrowFreshnessCheck(); } /* We fetch the amount the borrower owes, with accumulated interest */ uint accountBorrowsPrev = borrowBalanceStoredInternal(borrower); /* If repayAmount == -1, repayAmount = accountBorrows */ uint repayAmountFinal = repayAmount == type(uint).max ? accountBorrowsPrev : repayAmount; ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We call doTransferIn for the payer and the repayAmount * Note: The cToken must handle variations between ERC-20 and ETH underlying. * On success, the cToken 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. */ uint actualRepayAmount = doTransferIn(payer, repayAmountFinal); /* * We calculate the new borrower and total borrow balances, failing on underflow: * accountBorrowsNew = accountBorrows - actualRepayAmount * totalBorrowsNew = totalBorrows - actualRepayAmount */ uint accountBorrowsNew = accountBorrowsPrev - actualRepayAmount; uint totalBorrowsNew = totalBorrows > actualRepayAmount ? totalBorrows - actualRepayAmount : 0; /* We write the previously calculated values into storage */ accountBorrows[borrower].principal = accountBorrowsNew; accountBorrows[borrower].interestIndex = borrowIndex; totalBorrows = totalBorrowsNew; /* We emit a RepayBorrow event */ emit RepayBorrow(payer, borrower, actualRepayAmount, accountBorrowsNew, totalBorrowsNew); if (accountBorrowsNew == 0 && accountTokens[borrower] == 0) { comptroller.autoExitMarkets(borrower); // silent failure allowed } return actualRepayAmount; } /** * @notice The sender liquidates the borrowers collateral. * The collateral seized is transferred to the liquidator. * @param liquidator The liquidator repaying the borrow and seizing collateral * @param borrower The borrower of this cToken to be liquidated * @param repayAmount The amount of the underlying borrowed asset to repay */ function _liquidateBorrowInternal(address liquidator, address borrower, uint repayAmount) internal nonReentrant returns (uint) { if (msg.sender != address(comptroller)) { revert Unauthorized(); } accrueInterest(); /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { revert LiquidateFreshnessCheck(); } /* Fail if borrower = liquidator */ if (borrower == liquidator) { revert LiquidateLiquidatorIsBorrower(); } /* Fail if repayAmount = 0 */ if (repayAmount == 0) { revert LiquidateCloseAmountIsZero(); } /* Fail if repayBorrow fails */ uint actualRepayAmount = repayBorrowFresh(liquidator, borrower, repayAmount); /* We emit a LiquidateBorrow event */ emit LiquidateBorrow(liquidator, borrower, actualRepayAmount); return actualRepayAmount; } /** * @notice Transfers collateral tokens (this market) to the liquidator. * This function can only be called by the Comptroller. * @param liquidator The account receiving seized collateral * @param borrower The account having collateral seized * @param seizeTokens The number of cTokens to seize * @return uint actual seizeTokens */ function _seize(address liquidator, address borrower, uint seizeTokens) override virtual external nonReentrant returns (uint) { if (msg.sender != address(comptroller)) { revert Unauthorized(); } accrueInterest(); /* Fail if borrower = liquidator */ if (borrower == liquidator) { revert LiquidateSeizeLiquidatorIsBorrower(); } /* * We calculate the new borrower and liquidator token balances, failing on underflow/overflow: * borrowerTokensNew = accountTokens[borrower] - seizeTokens * liquidatorTokensNew = accountTokens[liquidator] + seizeTokens */ uint protocolSeizeTokens = mul_(seizeTokens, Exp({mantissa: protocolSeizeShareMantissa})); uint liquidatorSeizeTokens = seizeTokens - protocolSeizeTokens; Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal()}); uint protocolSeizeAmount = mul_ScalarTruncate(exchangeRate, protocolSeizeTokens); uint totalReservesNew = totalReserves + protocolSeizeAmount; ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* We write the calculated values into storage */ totalReserves = totalReservesNew; totalSupply = totalSupply - protocolSeizeTokens; accountTokens[borrower] = accountTokens[borrower] - seizeTokens; accountTokens[liquidator] = accountTokens[liquidator] + liquidatorSeizeTokens; /* Emit a Transfer event */ emit Transfer(borrower, liquidator, liquidatorSeizeTokens); emit Transfer(borrower, address(this), protocolSeizeTokens); emit ReservesAdded(address(this), protocolSeizeAmount, totalReservesNew); return seizeTokens; } /*** 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) override external returns (uint) { // Check caller = admin if (msg.sender != admin) { revert SetPendingAdminOwnerCheck(); } // 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 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() override external returns (uint) { // Check caller is pendingAdmin and pendingAdmin ≠address(0) if (msg.sender != pendingAdmin || msg.sender == address(0)) { revert AcceptAdminPendingAdminCheck(); } // 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 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) override public returns (uint) { // Check caller is admin if (msg.sender != admin) { revert SetComptrollerOwnerCheck(); } ComptrollerInterface oldComptroller = comptroller; // Ensure invoke comptroller.isComptroller() returns true if (!newComptroller.isComptroller()) { revert InvalidComptrollerAddress(address(newComptroller)); } // Set market's comptroller to newComptroller comptroller = newComptroller; // Emit NewComptroller(oldComptroller, newComptroller) emit NewComptroller(oldComptroller, newComptroller); return NO_ERROR; } /** * @notice Sets protocolSeizeShareMantissa * @dev Admin function to set protocolSeizeShareMantissa * @param newProtocolSeizeShareMantissa New protocolSeizeShareMantissa scaled by 1e18 * @return uint 0=success, otherwise a failure. (See ErrorReporter for details) */ function _setProtocolSeizeShare(uint newProtocolSeizeShareMantissa) virtual override external returns (uint) { // Check caller is admin if (msg.sender != admin) { revert SetProtocolSeizeShareAdminCheck(); } if (newProtocolSeizeShareMantissa > protocolSeizeShareMaxMantissa) { revert SetProtocolSeizeShareTooHigh(); } // Save current value for use in log uint oldProtocolSeizeShareMantissa = protocolSeizeShareMantissa; // Set liquidation incentive to new incentive protocolSeizeShareMantissa = newProtocolSeizeShareMantissa; // Emit event with old incentive, new incentive emit NewProtocolSeizeShare(oldProtocolSeizeShareMantissa, newProtocolSeizeShareMantissa); return 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) override external nonReentrant returns (uint) { accrueInterest(); // _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) { revert SetReserveFactorAdminCheck(); } // Verify market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { revert SetReserveFactorFreshCheck(); } // Check newReserveFactor ≤ maxReserveFactor if (newReserveFactorMantissa > reserveFactorMaxMantissa) { revert SetReserveFactorBoundsCheck(); } uint oldReserveFactorMantissa = reserveFactorMantissa; reserveFactorMantissa = newReserveFactorMantissa; emit NewReserveFactor(oldReserveFactorMantissa, newReserveFactorMantissa); return 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 nonReentrantWL returns (uint) { accrueInterest(); // _addReservesFresh emits reserve-addition-specific logs on errors, so we don't need to. _addReservesFresh(addAmount); return NO_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 virtual returns (uint, uint) { // totalReserves + actualAddAmount uint totalReservesNew; uint actualAddAmount = 0; // We fail gracefully unless market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { revert AddReservesFactorFreshCheck(actualAddAmount); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We call doTransferIn for the caller and the addAmount * Note: The cToken must handle variations between ERC-20 and ETH underlying. * On success, the cToken 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; // 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 (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) override external nonReentrant returns (uint) { accrueInterest(); // _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 virtual returns (uint) { // totalReserves - reduceAmount uint totalReservesNew; // Check caller is admin if (msg.sender != admin) { revert ReduceReservesAdminCheck(); } // We fail gracefully unless market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { revert ReduceReservesFreshCheck(); } // Fail gracefully if protocol has insufficient underlying cash if (getCashPrior() < reduceAmount) { revert ReduceReservesCashNotAvailable(); } // Check reduceAmount ≤ reserves[n] (totalReserves) if (reduceAmount > totalReserves) { revert ReduceReservesCashValidation(); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) totalReservesNew = totalReserves - reduceAmount; // Store reserves[n+1] = reserves[n] - reduceAmount totalReserves = totalReservesNew; // doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred. doTransferOut(admin, reduceAmount); emit ReservesReduced(admin, reduceAmount, totalReservesNew); return 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) override public returns (uint) { accrueInterest(); // _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) { revert SetInterestRateModelOwnerCheck(); } // We fail gracefully unless market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { revert SetInterestRateModelFreshCheck(); } // Track the market's current interest rate model oldInterestRateModel = interestRateModel; // Ensure invoke newInterestRateModel.isInterestRateModel() returns true if (!newInterestRateModel.isInterestRateModel()) { revert InvalidRateModelAddress(address(newInterestRateModel)); } // Set the interest rate model to newInterestRateModel interestRateModel = newInterestRateModel; // Emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel) emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel); return NO_ERROR; } function _ensureNonEmpty(address minter, uint amount) virtual external; // called only once by the comptroller during _supportMarket function _ensureNonEmptyInternal(address minter, uint amount) internal nonReentrant { if (msg.sender != address(comptroller)) { revert Unauthorized(); } if (amount == 0) { revert EnsureNonEmptyAmountTooSmall(); } // this function is called during market setup, so an existing totalSupply should not be possible assert(totalSupply == 0); accrueInterest(); mintFresh(minter, amount); uint totalSupply_ = totalSupply; if (totalSupply_ == 0) { revert EnsureNonEmptyAmountTooSmall(); } assert(totalSupply_ == accountTokens[minter]); // burn minted balance accountTokens[minter] = 0; accountTokens[address(0)] = totalSupply_; emit Transfer(minter, address(0), totalSupply_); } /*** 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() virtual internal view 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) virtual internal returns (uint); /** * @dev Performs a transfer out, ideally returning an explanatory error code upon failure rather 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) virtual internal; /*** Reentrancy Guard ***/ /** * @dev Prevents a contract from calling itself, directly or indirectly. */ modifier nonReentrant() { if (!_notEntered) { revert Reentry(); } _notEntered = false; _; _notEntered = true; // get a gas-refund post-Istanbul } modifier nonReentrantWL() { if (!comptroller._checkEoaOrWL(msg.sender)) { revert Unauthorized(); } if (!_notEntered) { revert Reentry(); } _notEntered = false; _; _notEntered = true; // get a gas-refund post-Istanbul } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; /** * @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 0.8.23; /** * @title Exponential module for storing fixed-precision decimals * @author Compound * @notice Exp is a struct which stores decimals with a fixed precision of 18 decimal places. * Thus, if we wanted to store the 5.1, mantissa would store 5.1e18. That is: * `Exp({mantissa: 5100000000000000000})`. */ contract ExponentialNoError { uint constant expScale = 1e18; uint constant doubleScale = 1e36; uint constant halfExpScale = expScale/2; uint constant mantissaOne = expScale; struct Exp { uint mantissa; } struct Double { uint mantissa; } /** * @dev Truncates the given exp to a whole number value. * For example, truncate(Exp{mantissa: 15 * expScale}) = 15 */ function truncate(Exp memory exp) pure internal returns (uint) { // Note: We are not using careful math here as we're performing a division that cannot fail return exp.mantissa / expScale; } /** * @dev Multiply an Exp by a scalar, then truncate to return an unsigned integer. */ function mul_ScalarTruncate(Exp memory a, uint scalar) pure internal returns (uint) { 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) pure internal 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) pure internal returns (bool) { return left.mantissa < right.mantissa; } /** * @dev Checks if left Exp <= right Exp. */ function lessThanOrEqualExp(Exp memory left, Exp memory right) pure internal returns (bool) { return left.mantissa <= right.mantissa; } /** * @dev Checks if left Exp > right Exp. */ function greaterThanExp(Exp memory left, Exp memory right) pure internal returns (bool) { return left.mantissa > right.mantissa; } /** * @dev returns true if Exp is exactly zero */ function isZeroExp(Exp memory value) pure internal returns (bool) { return value.mantissa == 0; } function safe224(uint n, string memory errorMessage) pure internal returns (uint224) { require(n < 2**224, errorMessage); return uint224(n); } function safe32(uint n, string memory errorMessage) pure internal returns (uint32) { require(n < 2**32, errorMessage); return uint32(n); } function add_(Exp memory a, Exp memory b) pure internal returns (Exp memory) { return Exp({mantissa: add_(a.mantissa, b.mantissa)}); } function add_(Double memory a, Double memory b) pure internal returns (Double memory) { return Double({mantissa: add_(a.mantissa, b.mantissa)}); } function add_(uint a, uint b) pure internal returns (uint) { return a + b; } function sub_(Exp memory a, Exp memory b) pure internal returns (Exp memory) { return Exp({mantissa: sub_(a.mantissa, b.mantissa)}); } function sub_(Double memory a, Double memory b) pure internal returns (Double memory) { return Double({mantissa: sub_(a.mantissa, b.mantissa)}); } function sub_(uint a, uint b) pure internal returns (uint) { return a - b; } function mul_(Exp memory a, Exp memory b) pure internal returns (Exp memory) { return Exp({mantissa: mul_(a.mantissa, b.mantissa) / expScale}); } function mul_(Exp memory a, uint b) pure internal returns (Exp memory) { return Exp({mantissa: mul_(a.mantissa, b)}); } function mul_(uint a, Exp memory b) pure internal returns (uint) { return mul_(a, b.mantissa) / expScale; } function mul_(Double memory a, Double memory b) pure internal returns (Double memory) { return Double({mantissa: mul_(a.mantissa, b.mantissa) / doubleScale}); } function mul_(Double memory a, uint b) pure internal returns (Double memory) { return Double({mantissa: mul_(a.mantissa, b)}); } function mul_(uint a, Double memory b) pure internal returns (uint) { return mul_(a, b.mantissa) / doubleScale; } function mul_(uint a, uint b) pure internal returns (uint) { return a * b; } function div_(Exp memory a, Exp memory b) pure internal returns (Exp memory) { return Exp({mantissa: div_(mul_(a.mantissa, expScale), b.mantissa)}); } function div_(Exp memory a, uint b) pure internal returns (Exp memory) { return Exp({mantissa: div_(a.mantissa, b)}); } function div_(uint a, Exp memory b) pure internal returns (uint) { return div_(mul_(a, expScale), b.mantissa); } function div_(Double memory a, Double memory b) pure internal returns (Double memory) { return Double({mantissa: div_(mul_(a.mantissa, doubleScale), b.mantissa)}); } function div_(Double memory a, uint b) pure internal returns (Double memory) { return Double({mantissa: div_(a.mantissa, b)}); } function div_(uint a, Double memory b) pure internal returns (uint) { return div_(mul_(a, doubleScale), b.mantissa); } function div_(uint a, uint b) pure internal returns (uint) { return a / b; } function fraction(uint a, uint b) pure internal returns (Double memory) { return Double({mantissa: div_(mul_(a, doubleScale), b)}); } }
// SPDX-License-Identifier: BSD-3-Clause pragma solidity 0.8.23; import "CTokenInterfaces.sol"; contract CErc20InterestMarketStorage { uint public totalVirtual; } abstract contract CErc20InterestMarketInterface is CErc20Interface, CErc20InterestMarketStorage { /** * @notice Collect the interest from supplied ERC721 tokens for the lender and adds them to his supply. * Must be called by the supply market. * @param lender The address for which the interest should be collected * @param interestTokens The amount of market tokens to claim * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function collectInterest(address lender, uint interestTokens) virtual external returns (uint); /** * @notice Pay the interest for borrowed ERC721 tokens. * Must be called by the borrow market. * @param payer The address that pays the interest * @param interestTokens The amount of market tokens to pay * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function payInterest(address payer, uint interestTokens) virtual external returns (uint); /** * @notice Sender claims interest from NFT markets then redeems cTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of cTokens to redeem into underlying * @param cTokens The list of cToken addresses to redeem interest from. * Only possible for cErc721 markets. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemWithClaim(uint redeemTokens, address[] memory cTokens) virtual external returns (uint); /** * @notice Sender claims interest from NFT markets then redeems cTokens in exchange for a specified amount of underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemAmount The amount of underlying to redeem * @param cTokens The list of cToken addresses to redeem interest from. * Only possible for cErc721 markets. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlyingWithClaim(uint redeemAmount, address[] memory cTokens) virtual external returns (uint); }
{ "evmVersion": "shanghai", "optimizer": { "enabled": true, "runs": 200 }, "libraries": { "CErc20InterestMarketDelegator.sol": {} }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : underlying_ (address): 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
Arg [1] : comptroller_ (address): 0xf9c70750bF615dE83fE7FF62D30C7faACD8f8Ba0
Arg [2] : interestRateModel_ (address): 0x8cd2001327a919653B9E0E1ADB9298772eD8d25c
Arg [3] : initialExchangeRateMantissa_ (uint256): 200000000000000
Arg [4] : name_ (string): Fungify USDC
Arg [5] : symbol_ (string): fUSDC
Arg [6] : decimals_ (uint8): 8
Arg [7] : admin_ (address): 0x43A314183c0033528827Be7cF426523bAc412780
Arg [8] : implementation_ (address): 0xc98309df91df32867E83fbE472cEdF54Bc80C8ac
Arg [9] : becomeImplementationData (bytes): 0x
-----Encoded View---------------
16 Constructor Arguments found :
Arg [0] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
Arg [1] : 000000000000000000000000f9c70750bf615de83fe7ff62d30c7faacd8f8ba0
Arg [2] : 0000000000000000000000008cd2001327a919653b9e0e1adb9298772ed8d25c
Arg [3] : 0000000000000000000000000000000000000000000000000000b5e620f48000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000180
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [7] : 00000000000000000000000043a314183c0033528827be7cf426523bac412780
Arg [8] : 000000000000000000000000c98309df91df32867e83fbe472cedf54bc80c8ac
Arg [9] : 00000000000000000000000000000000000000000000000000000000000001c0
Arg [10] : 000000000000000000000000000000000000000000000000000000000000000c
Arg [11] : 46756e6769667920555344430000000000000000000000000000000000000000
Arg [12] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [13] : 6655534443000000000000000000000000000000000000000000000000000000
Arg [14] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [15] : 0000000000000000000000000000000000000000000000000000000000000000
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Multichain Portfolio | 31 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | 100.00% | $0.999974 | 33,788.197 | $33,787.32 |
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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.