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0x60806040 | 13335213 | 962 days ago | IN | Create: RewardsDistributorDelegate | 0 ETH | 0.27223038 |
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Contract Name:
RewardsDistributorDelegate
Compiler Version
v0.5.17+commit.d19bba13
Contract Source Code (Solidity Multiple files format)
pragma solidity ^0.5.16; import "./CToken.sol"; import "./ExponentialNoError.sol"; import "./Comptroller.sol"; import "./RewardsDistributorStorage.sol"; /** * @title RewardsDistributorDelegate (COMP distribution logic extracted from `Comptroller`) * @author Compound */ contract RewardsDistributorDelegate is RewardsDistributorDelegateStorageV1, ExponentialNoError { /// @dev Notice that this contract is a RewardsDistributor bool public constant isRewardsDistributor = true; /// @notice Emitted when pendingAdmin is changed event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin); /// @notice Emitted when pendingAdmin is accepted, which means admin is updated event NewAdmin(address oldAdmin, address newAdmin); /// @notice Emitted when a new COMP speed is calculated for a market event CompSupplySpeedUpdated(CToken indexed cToken, uint newSpeed); /// @notice Emitted when a new COMP speed is calculated for a market event CompBorrowSpeedUpdated(CToken indexed cToken, uint newSpeed); /// @notice Emitted when a new COMP speed is set for a contributor event ContributorCompSpeedUpdated(address indexed contributor, uint newSpeed); /// @notice Emitted when COMP is distributed to a supplier event DistributedSupplierComp(CToken indexed cToken, address indexed supplier, uint compDelta, uint compSupplyIndex); /// @notice Emitted when COMP is distributed to a borrower event DistributedBorrowerComp(CToken indexed cToken, address indexed borrower, uint compDelta, uint compBorrowIndex); /// @notice Emitted when COMP is granted by admin event CompGranted(address recipient, uint amount); /// @notice The initial COMP index for a market uint224 public constant compInitialIndex = 1e36; /// @dev Intitializer to set admin to caller and set reward token function initialize(address _rewardToken) external { require(msg.sender == admin, "Only admin can initialize."); require(rewardToken == address(0), "Already initialized."); require(_rewardToken != address(0), "Cannot initialize reward token to the zero address."); rewardToken = _rewardToken; } /*** Set Admin ***/ /** * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer. * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer. * @param newPendingAdmin New pending admin. */ function _setPendingAdmin(address newPendingAdmin) external { // Check caller = admin require(msg.sender == admin, "RewardsDistributor:_setPendingAdmin: admin only"); // Save current value, if any, for inclusion in log address oldPendingAdmin = pendingAdmin; // Store pendingAdmin with value newPendingAdmin pendingAdmin = newPendingAdmin; // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin) emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin); } /** * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin * @dev Admin function for pending admin to accept role and update admin */ function _acceptAdmin() external { // Check caller is pendingAdmin and pendingAdmin ≠ address(0) require(msg.sender == pendingAdmin && msg.sender != address(0), "RewardsDistributor:_acceptAdmin: pending admin only"); // Save current values for inclusion in log address oldAdmin = admin; address oldPendingAdmin = pendingAdmin; // Store admin with value pendingAdmin admin = pendingAdmin; // Clear the pending value pendingAdmin = address(0); emit NewAdmin(oldAdmin, admin); emit NewPendingAdmin(oldPendingAdmin, pendingAdmin); } /*** Comp Distribution ***/ /** * @notice Check the cToken before adding * @param cToken The market to add */ function checkCToken(CToken cToken) internal view { // Make sure cToken is listed Comptroller comptroller = Comptroller(address(cToken.comptroller())); (bool isListed, ) = comptroller.markets(address(cToken)); require(isListed == true, "comp market is not listed"); // Make sure distributor is added bool distributorAdded = false; address[] memory distributors = comptroller.getRewardsDistributors(); for (uint256 i = 0; i < distributors.length; i++) if (distributors[i] == address(this)) distributorAdded = true; require(distributorAdded == true, "distributor not added"); } /** * @notice Set COMP speed for a single market * @param cToken The market whose COMP speed to update * @param compSpeed New COMP speed for market */ function setCompSupplySpeedInternal(CToken cToken, uint compSpeed) internal { uint currentCompSpeed = compSupplySpeeds[address(cToken)]; if (currentCompSpeed != 0) { // note that COMP speed could be set to 0 to halt liquidity rewards for a market updateCompSupplyIndex(address(cToken)); } else if (compSpeed != 0) { // Make sure cToken is listed and distributor is added checkCToken(cToken); // Add the COMP market if (compSupplyState[address(cToken)].index == 0) { compSupplyState[address(cToken)] = CompMarketState({ index: compInitialIndex, block: safe32(getBlockNumber(), "block number exceeds 32 bits") }); // Add to allMarkets array if not already there if (compBorrowState[address(cToken)].index == 0) { allMarkets.push(cToken); } } else { // Update block number to ensure extra interest is not accrued during the prior period compSupplyState[address(cToken)].block = safe32(getBlockNumber(), "block number exceeds 32 bits"); } } if (currentCompSpeed != compSpeed) { compSupplySpeeds[address(cToken)] = compSpeed; emit CompSupplySpeedUpdated(cToken, compSpeed); } } /** * @notice Set COMP speed for a single market * @param cToken The market whose COMP speed to update * @param compSpeed New COMP speed for market */ function setCompBorrowSpeedInternal(CToken cToken, uint compSpeed) internal { uint currentCompSpeed = compBorrowSpeeds[address(cToken)]; if (currentCompSpeed != 0) { // note that COMP speed could be set to 0 to halt liquidity rewards for a market Exp memory borrowIndex = Exp({mantissa: cToken.borrowIndex()}); updateCompBorrowIndex(address(cToken), borrowIndex); } else if (compSpeed != 0) { // Make sure cToken is listed and distributor is added checkCToken(cToken); // Add the COMP market if (compBorrowState[address(cToken)].index == 0) { compBorrowState[address(cToken)] = CompMarketState({ index: compInitialIndex, block: safe32(getBlockNumber(), "block number exceeds 32 bits") }); // Add to allMarkets array if not already there if (compSupplyState[address(cToken)].index == 0) { allMarkets.push(cToken); } } else { // Update block number to ensure extra interest is not accrued during the prior period compBorrowState[address(cToken)].block = safe32(getBlockNumber(), "block number exceeds 32 bits"); } } if (currentCompSpeed != compSpeed) { compBorrowSpeeds[address(cToken)] = compSpeed; emit CompBorrowSpeedUpdated(cToken, compSpeed); } } /** * @notice Accrue COMP to the market by updating the supply index * @param cToken The market whose supply index to update */ function updateCompSupplyIndex(address cToken) internal { CompMarketState storage supplyState = compSupplyState[cToken]; uint supplySpeed = compSupplySpeeds[cToken]; uint blockNumber = getBlockNumber(); uint deltaBlocks = sub_(blockNumber, uint(supplyState.block)); if (deltaBlocks > 0 && supplySpeed > 0) { uint supplyTokens = CToken(cToken).totalSupply(); uint compAccrued_ = mul_(deltaBlocks, supplySpeed); Double memory ratio = supplyTokens > 0 ? fraction(compAccrued_, supplyTokens) : Double({mantissa: 0}); Double memory index = add_(Double({mantissa: supplyState.index}), ratio); compSupplyState[cToken] = CompMarketState({ index: safe224(index.mantissa, "new index exceeds 224 bits"), block: safe32(blockNumber, "block number exceeds 32 bits") }); } else if (deltaBlocks > 0 && supplyState.index > 0) { supplyState.block = safe32(blockNumber, "block number exceeds 32 bits"); } } /** * @notice Accrue COMP to the market by updating the borrow index * @param cToken The market whose borrow index to update */ function updateCompBorrowIndex(address cToken, Exp memory marketBorrowIndex) internal { CompMarketState storage borrowState = compBorrowState[cToken]; uint borrowSpeed = compBorrowSpeeds[cToken]; uint blockNumber = getBlockNumber(); uint deltaBlocks = sub_(blockNumber, uint(borrowState.block)); if (deltaBlocks > 0 && borrowSpeed > 0) { uint borrowAmount = div_(CToken(cToken).totalBorrows(), marketBorrowIndex); uint compAccrued_ = mul_(deltaBlocks, borrowSpeed); Double memory ratio = borrowAmount > 0 ? fraction(compAccrued_, borrowAmount) : Double({mantissa: 0}); Double memory index = add_(Double({mantissa: borrowState.index}), ratio); compBorrowState[cToken] = CompMarketState({ index: safe224(index.mantissa, "new index exceeds 224 bits"), block: safe32(blockNumber, "block number exceeds 32 bits") }); } else if (deltaBlocks > 0 && borrowState.index > 0) { borrowState.block = safe32(blockNumber, "block number exceeds 32 bits"); } } /** * @notice Calculate COMP accrued by a supplier and possibly transfer it to them * @param cToken The market in which the supplier is interacting * @param supplier The address of the supplier to distribute COMP to */ function distributeSupplierComp(address cToken, address supplier) internal { CompMarketState storage supplyState = compSupplyState[cToken]; Double memory supplyIndex = Double({mantissa: supplyState.index}); Double memory supplierIndex = Double({mantissa: compSupplierIndex[cToken][supplier]}); compSupplierIndex[cToken][supplier] = supplyIndex.mantissa; if (supplierIndex.mantissa == 0 && supplyIndex.mantissa > 0) { supplierIndex.mantissa = compInitialIndex; } Double memory deltaIndex = sub_(supplyIndex, supplierIndex); uint supplierTokens = CToken(cToken).balanceOf(supplier); uint supplierDelta = mul_(supplierTokens, deltaIndex); uint supplierAccrued = add_(compAccrued[supplier], supplierDelta); compAccrued[supplier] = supplierAccrued; emit DistributedSupplierComp(CToken(cToken), supplier, supplierDelta, supplyIndex.mantissa); } /** * @notice Calculate COMP accrued by a borrower and possibly transfer it to them * @dev Borrowers will not begin to accrue until after the first interaction with the protocol. * @param cToken The market in which the borrower is interacting * @param borrower The address of the borrower to distribute COMP to */ function distributeBorrowerComp(address cToken, address borrower, Exp memory marketBorrowIndex) internal { CompMarketState storage borrowState = compBorrowState[cToken]; Double memory borrowIndex = Double({mantissa: borrowState.index}); Double memory borrowerIndex = Double({mantissa: compBorrowerIndex[cToken][borrower]}); compBorrowerIndex[cToken][borrower] = borrowIndex.mantissa; if (borrowerIndex.mantissa > 0) { Double memory deltaIndex = sub_(borrowIndex, borrowerIndex); uint borrowerAmount = div_(CToken(cToken).borrowBalanceStored(borrower), marketBorrowIndex); uint borrowerDelta = mul_(borrowerAmount, deltaIndex); uint borrowerAccrued = add_(compAccrued[borrower], borrowerDelta); compAccrued[borrower] = borrowerAccrued; emit DistributedBorrowerComp(CToken(cToken), borrower, borrowerDelta, borrowIndex.mantissa); } } /** * @notice Keeps the flywheel moving pre-mint and pre-redeem * @dev Called by the Comptroller * @param cToken The relevant market * @param supplier The minter/redeemer */ function flywheelPreSupplierAction(address cToken, address supplier) external { if (compSupplyState[cToken].index > 0) { updateCompSupplyIndex(cToken); distributeSupplierComp(cToken, supplier); } } /** * @notice Keeps the flywheel moving pre-borrow and pre-repay * @dev Called by the Comptroller * @param cToken The relevant market * @param borrower The borrower */ function flywheelPreBorrowerAction(address cToken, address borrower) external { if (compBorrowState[cToken].index > 0) { Exp memory borrowIndex = Exp({mantissa: CToken(cToken).borrowIndex()}); updateCompBorrowIndex(cToken, borrowIndex); distributeBorrowerComp(cToken, borrower, borrowIndex); } } /** * @notice Keeps the flywheel moving pre-transfer and pre-seize * @dev Called by the Comptroller * @param cToken The relevant market * @param src The account which sources the tokens * @param dst The account which receives the tokens */ function flywheelPreTransferAction(address cToken, address src, address dst) external { if (compSupplyState[cToken].index > 0) { updateCompSupplyIndex(cToken); distributeSupplierComp(cToken, src); distributeSupplierComp(cToken, dst); } } /** * @notice Calculate additional accrued COMP for a contributor since last accrual * @param contributor The address to calculate contributor rewards for */ function updateContributorRewards(address contributor) public { uint compSpeed = compContributorSpeeds[contributor]; uint blockNumber = getBlockNumber(); uint deltaBlocks = sub_(blockNumber, lastContributorBlock[contributor]); if (deltaBlocks > 0 && compSpeed > 0) { uint newAccrued = mul_(deltaBlocks, compSpeed); uint contributorAccrued = add_(compAccrued[contributor], newAccrued); compAccrued[contributor] = contributorAccrued; lastContributorBlock[contributor] = blockNumber; } } /** * @notice Claim all the comp accrued by holder in all markets * @param holder The address to claim COMP for */ function claimRewards(address holder) public { return claimRewards(holder, allMarkets); } /** * @notice Claim all the comp accrued by holder in the specified markets * @param holder The address to claim COMP for * @param cTokens The list of markets to claim COMP in */ function claimRewards(address holder, CToken[] memory cTokens) public { address[] memory holders = new address[](1); holders[0] = holder; claimRewards(holders, cTokens, true, true); } /** * @notice Claim all comp accrued by the holders * @param holders The addresses to claim COMP for * @param cTokens The list of markets to claim COMP in * @param borrowers Whether or not to claim COMP earned by borrowing * @param suppliers Whether or not to claim COMP earned by supplying */ function claimRewards(address[] memory holders, CToken[] memory cTokens, bool borrowers, bool suppliers) public { for (uint i = 0; i < cTokens.length; i++) { CToken cToken = cTokens[i]; if (borrowers == true && compBorrowState[address(cToken)].index > 0) { Exp memory borrowIndex = Exp({mantissa: cToken.borrowIndex()}); updateCompBorrowIndex(address(cToken), borrowIndex); for (uint j = 0; j < holders.length; j++) { distributeBorrowerComp(address(cToken), holders[j], borrowIndex); } } if (suppliers == true && compSupplyState[address(cToken)].index > 0) { updateCompSupplyIndex(address(cToken)); for (uint j = 0; j < holders.length; j++) { distributeSupplierComp(address(cToken), holders[j]); } } } for (uint j = 0; j < holders.length; j++) { compAccrued[holders[j]] = grantCompInternal(holders[j], compAccrued[holders[j]]); } } /** * @notice Transfer COMP to the user * @dev Note: If there is not enough COMP, we do not perform the transfer all. * @param user The address of the user to transfer COMP to * @param amount The amount of COMP to (possibly) transfer * @return The amount of COMP which was NOT transferred to the user */ function grantCompInternal(address user, uint amount) internal returns (uint) { EIP20NonStandardInterface comp = EIP20NonStandardInterface(rewardToken); uint compRemaining = comp.balanceOf(address(this)); if (amount > 0 && amount <= compRemaining) { comp.transfer(user, amount); return 0; } return amount; } /*** Comp Distribution Admin ***/ /** * @notice Transfer COMP to the recipient * @dev Note: If there is not enough COMP, we do not perform the transfer all. * @param recipient The address of the recipient to transfer COMP to * @param amount The amount of COMP to (possibly) transfer */ function _grantComp(address recipient, uint amount) public { require(msg.sender == admin, "only admin can grant comp"); uint amountLeft = grantCompInternal(recipient, amount); require(amountLeft == 0, "insufficient comp for grant"); emit CompGranted(recipient, amount); } /** * @notice Set COMP speed for a single market * @param cToken The market whose COMP speed to update * @param compSpeed New COMP speed for market */ function _setCompSupplySpeed(CToken cToken, uint compSpeed) public { require(msg.sender == admin, "only admin can set comp speed"); setCompSupplySpeedInternal(cToken, compSpeed); } /** * @notice Set COMP speed for a single market * @param cToken The market whose COMP speed to update * @param compSpeed New COMP speed for market */ function _setCompBorrowSpeed(CToken cToken, uint compSpeed) public { require(msg.sender == admin, "only admin can set comp speed"); setCompBorrowSpeedInternal(cToken, compSpeed); } /** * @notice Set COMP borrow and supply speeds for the specified markets. * @param cTokens The markets whose COMP speed to update. * @param supplySpeeds New supply-side COMP speed for the corresponding market. * @param borrowSpeeds New borrow-side COMP speed for the corresponding market. */ function _setCompSpeeds(CToken[] memory cTokens, uint[] memory supplySpeeds, uint[] memory borrowSpeeds) public { require(msg.sender == admin, "only admin can set comp speed"); uint numTokens = cTokens.length; require(numTokens == supplySpeeds.length && numTokens == borrowSpeeds.length, "RewardsDistributor::_setCompSpeeds invalid input"); for (uint i = 0; i < numTokens; ++i) { setCompSupplySpeedInternal(cTokens[i], supplySpeeds[i]); setCompBorrowSpeedInternal(cTokens[i], borrowSpeeds[i]); } } /** * @notice Set COMP speed for a single contributor * @param contributor The contributor whose COMP speed to update * @param compSpeed New COMP speed for contributor */ function _setContributorCompSpeed(address contributor, uint compSpeed) public { require(msg.sender == admin, "only admin can set comp speed"); // note that COMP speed could be set to 0 to halt liquidity rewards for a contributor updateContributorRewards(contributor); if (compSpeed == 0) { // release storage delete lastContributorBlock[contributor]; } else { lastContributorBlock[contributor] = getBlockNumber(); } compContributorSpeeds[contributor] = compSpeed; emit ContributorCompSpeedUpdated(contributor, compSpeed); } /*** Helper Functions */ function getBlockNumber() public view returns (uint) { return block.number; } /** * @notice Returns an array of all markets. */ function getAllMarkets() external view returns (CToken[] memory) { return allMarkets; } }
pragma solidity ^0.5.16; /** * @title Careful Math * @author Compound * @notice Derived from OpenZeppelin's SafeMath library * https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/math/SafeMath.sol */ contract CarefulMath { /** * @dev Possible error codes that we can return */ enum MathError { NO_ERROR, DIVISION_BY_ZERO, INTEGER_OVERFLOW, INTEGER_UNDERFLOW } /** * @dev Multiplies two numbers, returns an error on overflow. */ function mulUInt(uint a, uint b) internal pure returns (MathError, uint) { if (a == 0) { return (MathError.NO_ERROR, 0); } uint c = a * b; if (c / a != b) { return (MathError.INTEGER_OVERFLOW, 0); } else { return (MathError.NO_ERROR, c); } } /** * @dev Integer division of two numbers, truncating the quotient. */ function divUInt(uint a, uint b) internal pure returns (MathError, uint) { if (b == 0) { return (MathError.DIVISION_BY_ZERO, 0); } return (MathError.NO_ERROR, a / b); } /** * @dev Subtracts two numbers, returns an error on overflow (i.e. if subtrahend is greater than minuend). */ function subUInt(uint a, uint b) internal pure returns (MathError, uint) { if (b <= a) { return (MathError.NO_ERROR, a - b); } else { return (MathError.INTEGER_UNDERFLOW, 0); } } /** * @dev Adds two numbers, returns an error on overflow. */ function addUInt(uint a, uint b) internal pure returns (MathError, uint) { uint c = a + b; if (c >= a) { return (MathError.NO_ERROR, c); } else { return (MathError.INTEGER_OVERFLOW, 0); } } /** * @dev add a and b and then subtract c */ function addThenSubUInt(uint a, uint b, uint c) internal pure returns (MathError, uint) { (MathError err0, uint sum) = addUInt(a, b); if (err0 != MathError.NO_ERROR) { return (err0, 0); } return subUInt(sum, c); } }
pragma solidity ^0.5.16; import "./CToken.sol"; interface CompLike { function delegate(address delegatee) external; } /** * @title Compound's CErc20 Contract * @notice CTokens which wrap an EIP-20 underlying * @dev This contract should not to be deployed on its own; instead, deploy `CErc20Delegator` (proxy contract) and `CErc20Delegate` (logic/implementation contract). * @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 name_ ERC-20 name of this token * @param symbol_ ERC-20 symbol of this token */ function initialize(address underlying_, ComptrollerInterface comptroller_, InterestRateModel interestRateModel_, string memory name_, string memory symbol_, uint256 reserveFactorMantissa_, uint256 adminFeeMantissa_) public { // CToken initialize does the bulk of the work uint256 initialExchangeRateMantissa_ = 0.2e18; uint8 decimals_ = EIP20Interface(underlying_).decimals(); super.initialize(comptroller_, interestRateModel_, initialExchangeRateMantissa_, name_, symbol_, decimals_, reserveFactorMantissa_, adminFeeMantissa_); // 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) external returns (uint) { (uint err,) = mintInternal(mintAmount); return err; } /** * @notice Sender redeems cTokens in exchange for the underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemTokens The number of cTokens to redeem into underlying * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeem(uint redeemTokens) external returns (uint) { return redeemInternal(redeemTokens); } /** * @notice Sender redeems cTokens in exchange for a specified amount of underlying asset * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param redeemAmount The amount of underlying to redeem * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlying(uint redeemAmount) external returns (uint) { return redeemUnderlyingInternal(redeemAmount); } /** * @notice Sender borrows assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function borrow(uint borrowAmount) external returns (uint) { return borrowInternal(borrowAmount); } /** * @notice Sender repays their own borrow * @param repayAmount The amount to repay * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function repayBorrow(uint repayAmount) external returns (uint) { (uint err,) = repayBorrowInternal(repayAmount); return err; } /** * @notice Sender repays a borrow belonging to borrower * @param borrower the account with the debt being payed off * @param repayAmount The amount to repay * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function repayBorrowBehalf(address borrower, uint repayAmount) external returns (uint) { (uint err,) = repayBorrowBehalfInternal(borrower, repayAmount); return err; } /** * @notice The sender liquidates the borrowers collateral. * The collateral seized is transferred to the liquidator. * @param borrower The borrower of this cToken to be liquidated * @param repayAmount The amount of the underlying borrowed asset to repay * @param cTokenCollateral The market in which to seize collateral from the borrower * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function liquidateBorrow(address borrower, uint repayAmount, CTokenInterface cTokenCollateral) external returns (uint) { (uint err,) = liquidateBorrowInternal(borrower, repayAmount, cTokenCollateral); return err; } /*** Safe Token ***/ /** * @notice Gets balance of this contract in terms of the underlying * @dev This excludes the value of the current message, if any * @return The quantity of underlying tokens owned by this contract */ function getCashPrior() internal view returns (uint) { EIP20Interface token = EIP20Interface(underlying); return token.balanceOf(address(this)); } /** * @dev Similar to EIP20 transfer, except it handles a False result from `transferFrom` and reverts in that case. * This will revert due to insufficient balance or insufficient allowance. * This function returns the actual amount received, * which may be less than `amount` if there is a fee attached to the transfer. * * Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value. * See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca */ function doTransferIn(address from, uint amount) internal returns (uint) { uint balanceBefore = EIP20Interface(underlying).balanceOf(address(this)); _callOptionalReturn(abi.encodeWithSelector(EIP20NonStandardInterface(underlying).transferFrom.selector, from, address(this), amount), "TOKEN_TRANSFER_IN_FAILED"); // Calculate the amount that was *actually* transferred uint balanceAfter = EIP20Interface(underlying).balanceOf(address(this)); require(balanceAfter >= balanceBefore, "TOKEN_TRANSFER_IN_OVERFLOW"); return balanceAfter - balanceBefore; // underflow already checked above, just subtract } /** * @dev Similar to EIP20 transfer, except it handles a False success from `transfer` and returns an explanatory * error code rather than reverting. If caller has not called checked protocol's balance, this may revert due to * insufficient cash held in this contract. If caller has checked protocol's balance prior to this call, and verified * it is >= amount, this should not revert in normal conditions. * * Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value. * See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca */ function doTransferOut(address payable to, uint amount) internal { _callOptionalReturn(abi.encodeWithSelector(EIP20NonStandardInterface(underlying).transfer.selector, to, amount), "TOKEN_TRANSFER_OUT_FAILED"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param data The call data (encoded using abi.encode or one of its variants). * @param errorMessage The revert string to return on failure. */ function _callOptionalReturn(bytes memory data, string memory errorMessage) internal { bytes memory returndata = _functionCall(underlying, data, errorMessage); if (returndata.length > 0) require(abi.decode(returndata, (bool)), errorMessage); } /** * @notice Admin call to delegate the votes of the COMP-like underlying * @param compLikeDelegatee The address to delegate votes to * @dev CTokens whose underlying are not CompLike should revert here */ function _delegateCompLikeTo(address compLikeDelegatee) external { require(hasAdminRights(), "only the admin may set the comp-like delegate"); CompLike(underlying).delegate(compLikeDelegatee); } }
pragma solidity ^0.5.16; import "./CToken.sol"; import "./CErc20.sol"; import "./ErrorReporter.sol"; import "./Exponential.sol"; import "./PriceOracle.sol"; import "./ComptrollerInterface.sol"; import "./ComptrollerStorage.sol"; import "./Unitroller.sol"; import "./RewardsDistributorDelegate.sol"; /** * @title Compound's Comptroller Contract * @author Compound * @dev This contract should not to be deployed alone; instead, deploy `Unitroller` (proxy contract) on top of this `Comptroller` (logic/implementation contract). */ contract Comptroller is ComptrollerV3Storage, ComptrollerInterface, ComptrollerErrorReporter, Exponential { /// @notice Emitted when an admin supports a market event MarketListed(CToken cToken); /// @notice Emitted when an admin unsupports a market event MarketUnlisted(CToken cToken); /// @notice Emitted when an account enters a market event MarketEntered(CToken cToken, address account); /// @notice Emitted when an account exits a market event MarketExited(CToken cToken, address account); /// @notice Emitted when close factor is changed by admin event NewCloseFactor(uint oldCloseFactorMantissa, uint newCloseFactorMantissa); /// @notice Emitted when a collateral factor is changed by admin event NewCollateralFactor(CToken cToken, uint oldCollateralFactorMantissa, uint newCollateralFactorMantissa); /// @notice Emitted when liquidation incentive is changed by admin event NewLiquidationIncentive(uint oldLiquidationIncentiveMantissa, uint newLiquidationIncentiveMantissa); /// @notice Emitted when price oracle is changed event NewPriceOracle(PriceOracle oldPriceOracle, PriceOracle newPriceOracle); /// @notice Emitted when pause guardian is changed event NewPauseGuardian(address oldPauseGuardian, address newPauseGuardian); /// @notice Emitted when an action is paused globally event ActionPaused(string action, bool pauseState); /// @notice Emitted when an action is paused on a market event ActionPaused(CToken cToken, string action, bool pauseState); /// @notice Emitted when the whitelist enforcement is changed event WhitelistEnforcementChanged(bool enforce); /// @notice Emitted when auto implementations are toggled event AutoImplementationsToggled(bool enabled); /// @notice Emitted when supply cap for a cToken is changed event NewSupplyCap(CToken indexed cToken, uint newSupplyCap); /// @notice Emitted when borrow cap for a cToken is changed event NewBorrowCap(CToken indexed cToken, uint newBorrowCap); /// @notice Emitted when borrow cap guardian is changed event NewBorrowCapGuardian(address oldBorrowCapGuardian, address newBorrowCapGuardian); /// @notice Emitted when a new RewardsDistributor contract is added to hooks event AddedRewardsDistributor(address rewardsDistributor); // closeFactorMantissa must be strictly greater than this value uint internal constant closeFactorMinMantissa = 0.05e18; // 0.05 // closeFactorMantissa must not exceed this value uint internal constant closeFactorMaxMantissa = 0.9e18; // 0.9 // No collateralFactorMantissa may exceed this value uint internal constant collateralFactorMaxMantissa = 0.9e18; // 0.9 // liquidationIncentiveMantissa must be no less than this value uint internal constant liquidationIncentiveMinMantissa = 1.0e18; // 1.0 // liquidationIncentiveMantissa must be no greater than this value uint internal constant liquidationIncentiveMaxMantissa = 1.5e18; // 1.5 /*** Assets You Are In ***/ /** * @notice Returns the assets an account has entered * @param account The address of the account to pull assets for * @return A dynamic list with the assets the account has entered */ function getAssetsIn(address account) external view returns (CToken[] memory) { CToken[] memory assetsIn = accountAssets[account]; return assetsIn; } /** * @notice Returns whether the given account is entered in the given asset * @param account The address of the account to check * @param cToken The cToken to check * @return True if the account is in the asset, otherwise false. */ function checkMembership(address account, CToken cToken) external view returns (bool) { return markets[address(cToken)].accountMembership[account]; } /** * @notice Add assets to be included in account liquidity calculation * @param cTokens The list of addresses of the cToken markets to be enabled * @return Success indicator for whether each corresponding market was entered */ function enterMarkets(address[] memory cTokens) public returns (uint[] memory) { uint len = cTokens.length; uint[] memory results = new uint[](len); for (uint i = 0; i < len; i++) { CToken cToken = CToken(cTokens[i]); results[i] = uint(addToMarketInternal(cToken, msg.sender)); } return results; } /** * @notice Add the market to the borrower's "assets in" for liquidity calculations * @param cToken The market to enter * @param borrower The address of the account to modify * @return Success indicator for whether the market was entered */ function addToMarketInternal(CToken cToken, address borrower) internal returns (Error) { Market storage marketToJoin = markets[address(cToken)]; if (!marketToJoin.isListed) { // market is not listed, cannot join return Error.MARKET_NOT_LISTED; } if (marketToJoin.accountMembership[borrower] == true) { // already joined return Error.NO_ERROR; } // survived the gauntlet, add to list // NOTE: we store these somewhat redundantly as a significant optimization // this avoids having to iterate through the list for the most common use cases // that is, only when we need to perform liquidity checks // and not whenever we want to check if an account is in a particular market marketToJoin.accountMembership[borrower] = true; accountAssets[borrower].push(cToken); // Add to allBorrowers if (!borrowers[borrower]) { allBorrowers.push(borrower); borrowers[borrower] = true; borrowerIndexes[borrower] = allBorrowers.length - 1; } emit MarketEntered(cToken, borrower); return Error.NO_ERROR; } /** * @notice Removes asset from sender's account liquidity calculation * @dev Sender must not have an outstanding borrow balance in the asset, * or be providing neccessary collateral for an outstanding borrow. * @param cTokenAddress The address of the asset to be removed * @return Whether or not the account successfully exited the market */ function exitMarket(address cTokenAddress) external returns (uint) { CToken cToken = CToken(cTokenAddress); /* Get sender tokensHeld and amountOwed underlying from the cToken */ (uint oErr, uint tokensHeld, uint amountOwed, ) = cToken.getAccountSnapshot(msg.sender); require(oErr == 0, "exitMarket: getAccountSnapshot failed"); // semi-opaque error code /* Fail if the sender has a borrow balance */ if (amountOwed != 0) { return fail(Error.NONZERO_BORROW_BALANCE, FailureInfo.EXIT_MARKET_BALANCE_OWED); } /* Fail if the sender is not permitted to redeem all of their tokens */ uint allowed = redeemAllowedInternal(cTokenAddress, msg.sender, tokensHeld); if (allowed != 0) { return failOpaque(Error.REJECTION, FailureInfo.EXIT_MARKET_REJECTION, allowed); } Market storage marketToExit = markets[address(cToken)]; /* Return true if the sender is not already ‘in’ the market */ if (!marketToExit.accountMembership[msg.sender]) { return uint(Error.NO_ERROR); } /* Set cToken account membership to false */ delete marketToExit.accountMembership[msg.sender]; /* Delete cToken from the account’s list of assets */ // load into memory for faster iteration CToken[] memory userAssetList = accountAssets[msg.sender]; uint len = userAssetList.length; uint assetIndex = len; for (uint i = 0; i < len; i++) { if (userAssetList[i] == cToken) { assetIndex = i; break; } } // We *must* have found the asset in the list or our redundant data structure is broken assert(assetIndex < len); // copy last item in list to location of item to be removed, reduce length by 1 CToken[] storage storedList = accountAssets[msg.sender]; storedList[assetIndex] = storedList[storedList.length - 1]; storedList.length--; // If the user has exited all markets, remove them from the `allBorrowers` array if (storedList.length == 0) { allBorrowers[borrowerIndexes[msg.sender]] = allBorrowers[allBorrowers.length - 1]; // Copy last item in list to location of item to be removed allBorrowers.length--; // Reduce length by 1 borrowerIndexes[allBorrowers[borrowerIndexes[msg.sender]]] = borrowerIndexes[msg.sender]; // Set borrower index of moved item to correct index borrowerIndexes[msg.sender] = 0; // Reset sender borrower index to 0 for a gas refund borrowers[msg.sender] = false; // Tell the contract that the sender is no longer a borrower (so it knows to add the borrower back if they enter a market in the future) } emit MarketExited(cToken, msg.sender); return uint(Error.NO_ERROR); } /*** Policy Hooks ***/ /** * @notice Checks if the account should be allowed to mint tokens in the given market * @param cToken The market to verify the mint against * @param minter The account which would get the minted tokens * @param mintAmount The amount of underlying being supplied to the market in exchange for tokens * @return 0 if the mint is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol) */ function mintAllowed(address cToken, address minter, uint mintAmount) external returns (uint) { // Pausing is a very serious situation - we revert to sound the alarms require(!mintGuardianPaused[cToken], "mint is paused"); // Shh - currently unused minter; mintAmount; // Make sure market is listed if (!markets[cToken].isListed) { return uint(Error.MARKET_NOT_LISTED); } // Make sure minter is whitelisted if (enforceWhitelist && !whitelist[minter]) { return uint(Error.SUPPLIER_NOT_WHITELISTED); } // Check supply cap uint supplyCap = supplyCaps[cToken]; // Supply cap of 0 corresponds to unlimited supplying if (supplyCap != 0) { uint totalCash = CToken(cToken).getCash(); uint totalBorrows = CToken(cToken).totalBorrows(); uint totalReserves = CToken(cToken).totalReserves(); uint totalFuseFees = CToken(cToken).totalFuseFees(); uint totalAdminFees = CToken(cToken).totalAdminFees(); // totalUnderlyingSupply = totalCash + totalBorrows - (totalReserves + totalFuseFees + totalAdminFees) (MathError mathErr, uint totalUnderlyingSupply) = addThenSubUInt(totalCash, totalBorrows, add_(add_(totalReserves, totalFuseFees), totalAdminFees)); if (mathErr != MathError.NO_ERROR) return uint(Error.MATH_ERROR); uint nextTotalUnderlyingSupply; (mathErr, nextTotalUnderlyingSupply) = addUInt(totalUnderlyingSupply, mintAmount); if (mathErr != MathError.NO_ERROR) return uint(Error.MATH_ERROR); require(nextTotalUnderlyingSupply < supplyCap, "market supply cap reached"); } // Keep the flywheel moving flywheelPreSupplierAction(cToken, minter); return uint(Error.NO_ERROR); } /** * @notice Validates mint and reverts on rejection. May emit logs. * @param cToken Asset being minted * @param minter The address minting the tokens * @param actualMintAmount The amount of the underlying asset being minted * @param mintTokens The number of tokens being minted */ function mintVerify(address cToken, address minter, uint actualMintAmount, uint mintTokens) external { // Shh - currently unused cToken; minter; actualMintAmount; mintTokens; // Shh - we don't ever want this hook to be marked pure if (false) { maxAssets = maxAssets; } // Add minter to suppliers mapping suppliers[minter] = true; } /** * @notice Checks if the account should be allowed to redeem tokens in the given market * @param cToken The market to verify the redeem against * @param redeemer The account which would redeem the tokens * @param redeemTokens The number of cTokens to exchange for the underlying asset in the market * @return 0 if the redeem is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol) */ function redeemAllowed(address cToken, address redeemer, uint redeemTokens) external returns (uint) { uint allowed = redeemAllowedInternal(cToken, redeemer, redeemTokens); if (allowed != uint(Error.NO_ERROR)) { return allowed; } // Keep the flywheel moving flywheelPreSupplierAction(cToken, redeemer); return uint(Error.NO_ERROR); } function redeemAllowedInternal(address cToken, address redeemer, uint redeemTokens) internal view returns (uint) { if (!markets[cToken].isListed) { return uint(Error.MARKET_NOT_LISTED); } /* If the redeemer is not 'in' the market, then we can bypass the liquidity check */ if (!markets[cToken].accountMembership[redeemer]) { return uint(Error.NO_ERROR); } /* Otherwise, perform a hypothetical liquidity check to guard against shortfall */ (Error err, , uint shortfall) = getHypotheticalAccountLiquidityInternal(redeemer, CToken(cToken), redeemTokens, 0); if (err != Error.NO_ERROR) { return uint(err); } if (shortfall > 0) { return uint(Error.INSUFFICIENT_LIQUIDITY); } return uint(Error.NO_ERROR); } /** * @notice Validates redeem and reverts on rejection. May emit logs. * @param cToken Asset being redeemed * @param redeemer The address redeeming the tokens * @param redeemAmount The amount of the underlying asset being redeemed * @param redeemTokens The number of tokens being redeemed */ function redeemVerify(address cToken, address redeemer, uint redeemAmount, uint redeemTokens) external { // Shh - currently unused cToken; redeemer; // Require tokens is zero or amount is also zero if (redeemTokens == 0 && redeemAmount > 0) { revert("redeemTokens zero"); } } /** * @notice Checks if the account should be allowed to borrow the underlying asset of the given market * @param cToken The market to verify the borrow against * @param borrower The account which would borrow the asset * @param borrowAmount The amount of underlying the account would borrow * @return 0 if the borrow is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol) */ function borrowAllowed(address cToken, address borrower, uint borrowAmount) external returns (uint) { // Pausing is a very serious situation - we revert to sound the alarms require(!borrowGuardianPaused[cToken], "borrow is paused"); // Make sure market is listed if (!markets[cToken].isListed) { return uint(Error.MARKET_NOT_LISTED); } if (!markets[cToken].accountMembership[borrower]) { // only cTokens may call borrowAllowed if borrower not in market require(msg.sender == cToken, "sender must be cToken"); // attempt to add borrower to the market Error err = addToMarketInternal(CToken(msg.sender), borrower); if (err != Error.NO_ERROR) { return uint(err); } // it should be impossible to break the important invariant assert(markets[cToken].accountMembership[borrower]); } // Make sure oracle price is available if (oracle.getUnderlyingPrice(CToken(cToken)) == 0) { return uint(Error.PRICE_ERROR); } // Make sure borrower is whitelisted if (enforceWhitelist && !whitelist[borrower]) { return uint(Error.SUPPLIER_NOT_WHITELISTED); } // Check borrow cap uint borrowCap = borrowCaps[cToken]; // Borrow cap of 0 corresponds to unlimited borrowing if (borrowCap != 0) { uint totalBorrows = CToken(cToken).totalBorrows(); (MathError mathErr, uint nextTotalBorrows) = addUInt(totalBorrows, borrowAmount); if (mathErr != MathError.NO_ERROR) return uint(Error.MATH_ERROR); require(nextTotalBorrows < borrowCap, "market borrow cap reached"); } // Keep the flywheel moving flywheelPreBorrowerAction(cToken, borrower); // Perform a hypothetical liquidity check to guard against shortfall (Error err, , uint shortfall) = getHypotheticalAccountLiquidityInternal(borrower, CToken(cToken), 0, borrowAmount); if (err != Error.NO_ERROR) { return uint(err); } if (shortfall > 0) { return uint(Error.INSUFFICIENT_LIQUIDITY); } return uint(Error.NO_ERROR); } /** * @notice Checks if the account should be allowed to borrow the underlying asset of the given market * @param cToken Asset whose underlying is being borrowed * @param accountBorrowsNew The user's new borrow balance of the underlying asset */ function borrowWithinLimits(address cToken, uint accountBorrowsNew) external returns (uint) { // Check if min borrow exists uint minBorrowEth = fuseAdmin.minBorrowEth(); if (minBorrowEth > 0) { // Get new underlying borrow balance of account for this cToken uint oraclePriceMantissa = oracle.getUnderlyingPrice(CToken(cToken)); if (oraclePriceMantissa == 0) return uint(Error.PRICE_ERROR); (MathError mathErr, uint borrowBalanceEth) = mulScalarTruncate(Exp({mantissa: oraclePriceMantissa}), accountBorrowsNew); if (mathErr != MathError.NO_ERROR) return uint(Error.MATH_ERROR); // Check against min borrow if (borrowBalanceEth < minBorrowEth) return uint(Error.BORROW_BELOW_MIN); } // Return no error return uint(Error.NO_ERROR); } /** * @notice Checks if the account should be allowed to borrow the underlying asset of the given market * @param cToken Asset whose underlying is being borrowed * @param exchangeRateMantissa Underlying/cToken exchange rate * @param accountTokens Initial account cToken balance * @param accountTokens Underlying amount to mint */ function mintWithinLimits(address cToken, uint exchangeRateMantissa, uint accountTokens, uint mintAmount) external returns (uint) { // Return no error return uint(Error.NO_ERROR); } /** * @notice Validates borrow and reverts on rejection. May emit logs. * @param cToken Asset whose underlying is being borrowed * @param borrower The address borrowing the underlying * @param borrowAmount The amount of the underlying asset requested to borrow */ function borrowVerify(address cToken, address borrower, uint borrowAmount) external { // Shh - currently unused cToken; borrower; borrowAmount; // Shh - we don't ever want this hook to be marked pure if (false) { maxAssets = maxAssets; } } /** * @notice Checks if the account should be allowed to repay a borrow in the given market * @param cToken The market to verify the repay against * @param payer The account which would repay the asset * @param borrower The account which would borrowed the asset * @param repayAmount The amount of the underlying asset the account would repay * @return 0 if the repay is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol) */ function repayBorrowAllowed( address cToken, address payer, address borrower, uint repayAmount) external returns (uint) { // Shh - currently unused payer; borrower; repayAmount; // Make sure market is listed if (!markets[cToken].isListed) { return uint(Error.MARKET_NOT_LISTED); } // Keep the flywheel moving flywheelPreBorrowerAction(cToken, borrower); return uint(Error.NO_ERROR); } /** * @notice Validates repayBorrow and reverts on rejection. May emit logs. * @param cToken Asset being repaid * @param payer The address repaying the borrow * @param borrower The address of the borrower * @param actualRepayAmount The amount of underlying being repaid */ function repayBorrowVerify( address cToken, address payer, address borrower, uint actualRepayAmount, uint borrowerIndex) external { // Shh - currently unused cToken; payer; borrower; actualRepayAmount; borrowerIndex; // Shh - we don't ever want this hook to be marked pure if (false) { maxAssets = maxAssets; } } /** * @notice Checks if the liquidation should be allowed to occur * @param cTokenBorrowed Asset which was borrowed by the borrower * @param cTokenCollateral Asset which was used as collateral and will be seized * @param liquidator The address repaying the borrow and seizing the collateral * @param borrower The address of the borrower * @param repayAmount The amount of underlying being repaid */ function liquidateBorrowAllowed( address cTokenBorrowed, address cTokenCollateral, address liquidator, address borrower, uint repayAmount) external returns (uint) { // Shh - currently unused liquidator; // Make sure markets are listed if (!markets[cTokenBorrowed].isListed || !markets[cTokenCollateral].isListed) { return uint(Error.MARKET_NOT_LISTED); } // Get borrowers's underlying borrow balance uint borrowBalance = CToken(cTokenBorrowed).borrowBalanceStored(borrower); /* allow accounts to be liquidated if the market is deprecated */ if (isDeprecated(CToken(cTokenBorrowed))) { require(borrowBalance >= repayAmount, "Can not repay more than the total borrow"); } else { /* The borrower must have shortfall in order to be liquidatable */ (Error err, , uint shortfall) = getAccountLiquidityInternal(borrower); if (err != Error.NO_ERROR) { return uint(err); } if (shortfall == 0) { return uint(Error.INSUFFICIENT_SHORTFALL); } /* The liquidator may not repay more than what is allowed by the closeFactor */ uint maxClose = mul_ScalarTruncate(Exp({mantissa: closeFactorMantissa}), borrowBalance); if (repayAmount > maxClose) { return uint(Error.TOO_MUCH_REPAY); } } return uint(Error.NO_ERROR); } /** * @notice Validates liquidateBorrow and reverts on rejection. May emit logs. * @param cTokenBorrowed Asset which was borrowed by the borrower * @param cTokenCollateral Asset which was used as collateral and will be seized * @param liquidator The address repaying the borrow and seizing the collateral * @param borrower The address of the borrower * @param actualRepayAmount The amount of underlying being repaid */ function liquidateBorrowVerify( address cTokenBorrowed, address cTokenCollateral, address liquidator, address borrower, uint actualRepayAmount, uint seizeTokens) external { // Shh - currently unused cTokenBorrowed; cTokenCollateral; liquidator; borrower; actualRepayAmount; seizeTokens; // Shh - we don't ever want this hook to be marked pure if (false) { maxAssets = maxAssets; } } /** * @notice Checks if the seizing of assets should be allowed to occur * @param cTokenCollateral Asset which was used as collateral and will be seized * @param cTokenBorrowed Asset which was borrowed by the borrower * @param liquidator The address repaying the borrow and seizing the collateral * @param borrower The address of the borrower * @param seizeTokens The number of collateral tokens to seize */ function seizeAllowed( address cTokenCollateral, address cTokenBorrowed, address liquidator, address borrower, uint seizeTokens) external returns (uint) { // Pausing is a very serious situation - we revert to sound the alarms require(!seizeGuardianPaused, "seize is paused"); // Shh - currently unused liquidator; borrower; seizeTokens; // Make sure markets are listed if (!markets[cTokenCollateral].isListed || !markets[cTokenBorrowed].isListed) { return uint(Error.MARKET_NOT_LISTED); } // Make sure cToken Comptrollers are identical if (CToken(cTokenCollateral).comptroller() != CToken(cTokenBorrowed).comptroller()) { return uint(Error.COMPTROLLER_MISMATCH); } // Keep the flywheel moving flywheelPreTransferAction(cTokenCollateral, borrower, liquidator); return uint(Error.NO_ERROR); } /** * @notice Validates seize and reverts on rejection. May emit logs. * @param cTokenCollateral Asset which was used as collateral and will be seized * @param cTokenBorrowed Asset which was borrowed by the borrower * @param liquidator The address repaying the borrow and seizing the collateral * @param borrower The address of the borrower * @param seizeTokens The number of collateral tokens to seize */ function seizeVerify( address cTokenCollateral, address cTokenBorrowed, address liquidator, address borrower, uint seizeTokens) external { // Shh - currently unused cTokenCollateral; cTokenBorrowed; liquidator; borrower; seizeTokens; // Shh - we don't ever want this hook to be marked pure if (false) { maxAssets = maxAssets; } } /** * @notice Checks if the account should be allowed to transfer tokens in the given market * @param cToken The market to verify the transfer against * @param src The account which sources the tokens * @param dst The account which receives the tokens * @param transferTokens The number of cTokens to transfer * @return 0 if the transfer is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol) */ function transferAllowed(address cToken, address src, address dst, uint transferTokens) external returns (uint) { // Pausing is a very serious situation - we revert to sound the alarms require(!transferGuardianPaused, "transfer is paused"); // Currently the only consideration is whether or not // the src is allowed to redeem this many tokens uint allowed = redeemAllowedInternal(cToken, src, transferTokens); if (allowed != uint(Error.NO_ERROR)) { return allowed; } // Keep the flywheel moving flywheelPreTransferAction(cToken, src, dst); return uint(Error.NO_ERROR); } /** * @notice Validates transfer and reverts on rejection. May emit logs. * @param cToken Asset being transferred * @param src The account which sources the tokens * @param dst The account which receives the tokens * @param transferTokens The number of cTokens to transfer */ function transferVerify(address cToken, address src, address dst, uint transferTokens) external { // Shh - currently unused cToken; src; dst; transferTokens; // Shh - we don't ever want this hook to be marked pure if (false) { maxAssets = maxAssets; } } /*** Flywheel Hooks ***/ /** * @notice Keeps the flywheel moving pre-mint and pre-redeem * @param cToken The relevant market * @param supplier The minter/redeemer */ function flywheelPreSupplierAction(address cToken, address supplier) internal { for (uint256 i = 0; i < rewardsDistributors.length; i++) RewardsDistributorDelegate(rewardsDistributors[i]).flywheelPreSupplierAction(cToken, supplier); } /** * @notice Keeps the flywheel moving pre-borrow and pre-repay * @param cToken The relevant market * @param borrower The borrower */ function flywheelPreBorrowerAction(address cToken, address borrower) internal { for (uint256 i = 0; i < rewardsDistributors.length; i++) RewardsDistributorDelegate(rewardsDistributors[i]).flywheelPreBorrowerAction(cToken, borrower); } /** * @notice Keeps the flywheel moving pre-transfer and pre-seize * @param cToken The relevant market * @param src The account which sources the tokens * @param dst The account which receives the tokens */ function flywheelPreTransferAction(address cToken, address src, address dst) internal { for (uint256 i = 0; i < rewardsDistributors.length; i++) RewardsDistributorDelegate(rewardsDistributors[i]).flywheelPreTransferAction(cToken, src, dst); } /*** Liquidity/Liquidation Calculations ***/ /** * @dev Local vars for avoiding stack-depth limits in calculating account liquidity. * Note that `cTokenBalance` is the number of cTokens the account owns in the market, * whereas `borrowBalance` is the amount of underlying that the account has borrowed. */ struct AccountLiquidityLocalVars { uint sumCollateral; uint sumBorrowPlusEffects; uint cTokenBalance; uint borrowBalance; uint exchangeRateMantissa; uint oraclePriceMantissa; Exp collateralFactor; Exp exchangeRate; Exp oraclePrice; Exp tokensToDenom; } /** * @notice Determine the current account liquidity wrt collateral requirements * @return (possible error code (semi-opaque), account liquidity in excess of collateral requirements, * account shortfall below collateral requirements) */ function getAccountLiquidity(address account) public view returns (uint, uint, uint) { (Error err, uint liquidity, uint shortfall) = getHypotheticalAccountLiquidityInternal(account, CToken(0), 0, 0); return (uint(err), liquidity, shortfall); } /** * @notice Determine the current account liquidity wrt collateral requirements * @return (possible error code, account liquidity in excess of collateral requirements, * account shortfall below collateral requirements) */ function getAccountLiquidityInternal(address account) internal view returns (Error, uint, uint) { return getHypotheticalAccountLiquidityInternal(account, CToken(0), 0, 0); } /** * @notice Determine what the account liquidity would be if the given amounts were redeemed/borrowed * @param cTokenModify The market to hypothetically redeem/borrow in * @param account The account to determine liquidity for * @param redeemTokens The number of tokens to hypothetically redeem * @param borrowAmount The amount of underlying to hypothetically borrow * @return (possible error code (semi-opaque), hypothetical account liquidity in excess of collateral requirements, * hypothetical account shortfall below collateral requirements) */ function getHypotheticalAccountLiquidity( address account, address cTokenModify, uint redeemTokens, uint borrowAmount) public view returns (uint, uint, uint) { (Error err, uint liquidity, uint shortfall) = getHypotheticalAccountLiquidityInternal(account, CToken(cTokenModify), redeemTokens, borrowAmount); return (uint(err), liquidity, shortfall); } /** * @notice Determine what the account liquidity would be if the given amounts were redeemed/borrowed * @param cTokenModify The market to hypothetically redeem/borrow in * @param account The account to determine liquidity for * @param redeemTokens The number of tokens to hypothetically redeem * @param borrowAmount The amount of underlying to hypothetically borrow * @dev Note that we calculate the exchangeRateStored for each collateral cToken using stored data, * without calculating accumulated interest. * @return (possible error code, hypothetical account liquidity in excess of collateral requirements, * hypothetical account shortfall below collateral requirements) */ function getHypotheticalAccountLiquidityInternal( address account, CToken cTokenModify, uint redeemTokens, uint borrowAmount) internal view returns (Error, uint, uint) { AccountLiquidityLocalVars memory vars; // Holds all our calculation results uint oErr; // For each asset the account is in CToken[] memory assets = accountAssets[account]; for (uint i = 0; i < assets.length; i++) { CToken asset = assets[i]; // Read the balances and exchange rate from the cToken (oErr, vars.cTokenBalance, vars.borrowBalance, vars.exchangeRateMantissa) = asset.getAccountSnapshot(account); if (oErr != 0) { // semi-opaque error code, we assume NO_ERROR == 0 is invariant between upgrades return (Error.SNAPSHOT_ERROR, 0, 0); } vars.collateralFactor = Exp({mantissa: markets[address(asset)].collateralFactorMantissa}); vars.exchangeRate = Exp({mantissa: vars.exchangeRateMantissa}); // Get the normalized price of the asset vars.oraclePriceMantissa = oracle.getUnderlyingPrice(asset); if (vars.oraclePriceMantissa == 0) { return (Error.PRICE_ERROR, 0, 0); } vars.oraclePrice = Exp({mantissa: vars.oraclePriceMantissa}); // Pre-compute a conversion factor from tokens -> ether (normalized price value) vars.tokensToDenom = mul_(mul_(vars.collateralFactor, vars.exchangeRate), vars.oraclePrice); // sumCollateral += tokensToDenom * cTokenBalance vars.sumCollateral = mul_ScalarTruncateAddUInt(vars.tokensToDenom, vars.cTokenBalance, vars.sumCollateral); // sumBorrowPlusEffects += oraclePrice * borrowBalance vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(vars.oraclePrice, vars.borrowBalance, vars.sumBorrowPlusEffects); // Calculate effects of interacting with cTokenModify if (asset == cTokenModify) { // redeem effect // sumBorrowPlusEffects += tokensToDenom * redeemTokens vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(vars.tokensToDenom, redeemTokens, vars.sumBorrowPlusEffects); // borrow effect // sumBorrowPlusEffects += oraclePrice * borrowAmount vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(vars.oraclePrice, borrowAmount, vars.sumBorrowPlusEffects); } } // These are safe, as the underflow condition is checked first if (vars.sumCollateral > vars.sumBorrowPlusEffects) { return (Error.NO_ERROR, vars.sumCollateral - vars.sumBorrowPlusEffects, 0); } else { return (Error.NO_ERROR, 0, vars.sumBorrowPlusEffects - vars.sumCollateral); } } /** * @notice Calculate number of tokens of collateral asset to seize given an underlying amount * @dev Used in liquidation (called in cToken.liquidateBorrowFresh) * @param cTokenBorrowed The address of the borrowed cToken * @param cTokenCollateral The address of the collateral cToken * @param actualRepayAmount The amount of cTokenBorrowed underlying to convert into cTokenCollateral tokens * @return (errorCode, number of cTokenCollateral tokens to be seized in a liquidation) */ function liquidateCalculateSeizeTokens(address cTokenBorrowed, address cTokenCollateral, uint actualRepayAmount) external view returns (uint, uint) { /* Read oracle prices for borrowed and collateral markets */ uint priceBorrowedMantissa = oracle.getUnderlyingPrice(CToken(cTokenBorrowed)); uint priceCollateralMantissa = oracle.getUnderlyingPrice(CToken(cTokenCollateral)); if (priceBorrowedMantissa == 0 || priceCollateralMantissa == 0) { return (uint(Error.PRICE_ERROR), 0); } /* * Get the exchange rate and calculate the number of collateral tokens to seize: * seizeAmount = actualRepayAmount * liquidationIncentive * priceBorrowed / priceCollateral * seizeTokens = seizeAmount / exchangeRate * = actualRepayAmount * (liquidationIncentive * priceBorrowed) / (priceCollateral * exchangeRate) */ uint exchangeRateMantissa = CToken(cTokenCollateral).exchangeRateStored(); // Note: reverts on error uint seizeTokens; Exp memory numerator; Exp memory denominator; Exp memory ratio; numerator = mul_(Exp({mantissa: liquidationIncentiveMantissa}), Exp({mantissa: priceBorrowedMantissa})); denominator = mul_(Exp({mantissa: priceCollateralMantissa}), Exp({mantissa: exchangeRateMantissa})); ratio = div_(numerator, denominator); seizeTokens = mul_ScalarTruncate(ratio, actualRepayAmount); return (uint(Error.NO_ERROR), seizeTokens); } /*** Admin Functions ***/ /** * @notice Add a RewardsDistributor contracts. * @dev Admin function to add a RewardsDistributor contract * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _addRewardsDistributor(address distributor) external returns (uint) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.ADD_REWARDS_DISTRIBUTOR_OWNER_CHECK); } // Check marker method require(RewardsDistributorDelegate(distributor).isRewardsDistributor(), "marker method returned false"); // Check for existing RewardsDistributor for (uint i = 0; i < rewardsDistributors.length; i++) require(distributor != rewardsDistributors[i], "RewardsDistributor contract already added"); // Add RewardsDistributor to array rewardsDistributors.push(distributor); emit AddedRewardsDistributor(distributor); return uint(Error.NO_ERROR); } /** * @notice Sets the whitelist enforcement for the comptroller * @dev Admin function to set a new whitelist enforcement boolean * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setWhitelistEnforcement(bool enforce) external returns (uint) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_WHITELIST_ENFORCEMENT_OWNER_CHECK); } // Check if `enforceWhitelist` already equals `enforce` if (enforceWhitelist == enforce) { return uint(Error.NO_ERROR); } // Set comptroller's `enforceWhitelist` to `enforce` enforceWhitelist = enforce; // Emit WhitelistEnforcementChanged(bool enforce); emit WhitelistEnforcementChanged(enforce); return uint(Error.NO_ERROR); } /** * @notice Sets the whitelist `statuses` for `suppliers` * @dev Admin function to set the whitelist `statuses` for `suppliers` * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setWhitelistStatuses(address[] calldata suppliers, bool[] calldata statuses) external returns (uint) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_WHITELIST_STATUS_OWNER_CHECK); } // Set whitelist statuses for suppliers for (uint i = 0; i < suppliers.length; i++) { address supplier = suppliers[i]; if (statuses[i]) { // If not already whitelisted, add to whitelist if (!whitelist[supplier]) { whitelist[supplier] = true; whitelistArray.push(supplier); whitelistIndexes[supplier] = whitelistArray.length - 1; } } else { // If whitelisted, remove from whitelist if (whitelist[supplier]) { whitelistArray[whitelistIndexes[supplier]] = whitelistArray[whitelistArray.length - 1]; // Copy last item in list to location of item to be removed whitelistArray.length--; // Reduce length by 1 whitelistIndexes[whitelistArray[whitelistIndexes[supplier]]] = whitelistIndexes[supplier]; // Set whitelist index of moved item to correct index whitelistIndexes[supplier] = 0; // Reset supplier whitelist index to 0 for a gas refund whitelist[supplier] = false; // Tell the contract that the supplier is no longer whitelisted } } } return uint(Error.NO_ERROR); } /** * @notice Sets a new price oracle for the comptroller * @dev Admin function to set a new price oracle * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setPriceOracle(PriceOracle newOracle) public returns (uint) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_PRICE_ORACLE_OWNER_CHECK); } // Track the old oracle for the comptroller PriceOracle oldOracle = oracle; // Set comptroller's oracle to newOracle oracle = newOracle; // Emit NewPriceOracle(oldOracle, newOracle) emit NewPriceOracle(oldOracle, newOracle); return uint(Error.NO_ERROR); } /** * @notice Sets the closeFactor used when liquidating borrows * @dev Admin function to set closeFactor * @param newCloseFactorMantissa New close factor, scaled by 1e18 * @return uint 0=success, otherwise a failure. (See ErrorReporter for details) */ function _setCloseFactor(uint newCloseFactorMantissa) external returns (uint256) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_CLOSE_FACTOR_OWNER_CHECK); } // Check limits Exp memory newCloseFactorExp = Exp({mantissa: newCloseFactorMantissa}); Exp memory lowLimit = Exp({mantissa: closeFactorMinMantissa}); if (lessThanOrEqualExp(newCloseFactorExp, lowLimit)) { return fail(Error.INVALID_CLOSE_FACTOR, FailureInfo.SET_CLOSE_FACTOR_VALIDATION); } Exp memory highLimit = Exp({mantissa: closeFactorMaxMantissa}); if (lessThanExp(highLimit, newCloseFactorExp)) { return fail(Error.INVALID_CLOSE_FACTOR, FailureInfo.SET_CLOSE_FACTOR_VALIDATION); } // Set pool close factor to new close factor, remember old value uint oldCloseFactorMantissa = closeFactorMantissa; closeFactorMantissa = newCloseFactorMantissa; // Emit event emit NewCloseFactor(oldCloseFactorMantissa, closeFactorMantissa); return uint(Error.NO_ERROR); } /** * @notice Sets the collateralFactor for a market * @dev Admin function to set per-market collateralFactor * @param cToken The market to set the factor on * @param newCollateralFactorMantissa The new collateral factor, scaled by 1e18 * @return uint 0=success, otherwise a failure. (See ErrorReporter for details) */ function _setCollateralFactor(CToken cToken, uint newCollateralFactorMantissa) public returns (uint256) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_COLLATERAL_FACTOR_OWNER_CHECK); } // Verify market is listed Market storage market = markets[address(cToken)]; if (!market.isListed) { return fail(Error.MARKET_NOT_LISTED, FailureInfo.SET_COLLATERAL_FACTOR_NO_EXISTS); } Exp memory newCollateralFactorExp = Exp({mantissa: newCollateralFactorMantissa}); // Check collateral factor <= 0.9 Exp memory highLimit = Exp({mantissa: collateralFactorMaxMantissa}); if (lessThanExp(highLimit, newCollateralFactorExp)) { return fail(Error.INVALID_COLLATERAL_FACTOR, FailureInfo.SET_COLLATERAL_FACTOR_VALIDATION); } // If collateral factor != 0, fail if price == 0 if (newCollateralFactorMantissa != 0 && oracle.getUnderlyingPrice(cToken) == 0) { return fail(Error.PRICE_ERROR, FailureInfo.SET_COLLATERAL_FACTOR_WITHOUT_PRICE); } // Set market's collateral factor to new collateral factor, remember old value uint oldCollateralFactorMantissa = market.collateralFactorMantissa; market.collateralFactorMantissa = newCollateralFactorMantissa; // Emit event with asset, old collateral factor, and new collateral factor emit NewCollateralFactor(cToken, oldCollateralFactorMantissa, newCollateralFactorMantissa); return uint(Error.NO_ERROR); } /** * @notice Sets liquidationIncentive * @dev Admin function to set liquidationIncentive * @param newLiquidationIncentiveMantissa New liquidationIncentive scaled by 1e18 * @return uint 0=success, otherwise a failure. (See ErrorReporter for details) */ function _setLiquidationIncentive(uint newLiquidationIncentiveMantissa) external returns (uint) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_LIQUIDATION_INCENTIVE_OWNER_CHECK); } // Check de-scaled min <= newLiquidationIncentive <= max Exp memory newLiquidationIncentive = Exp({mantissa: newLiquidationIncentiveMantissa}); Exp memory minLiquidationIncentive = Exp({mantissa: liquidationIncentiveMinMantissa}); if (lessThanExp(newLiquidationIncentive, minLiquidationIncentive)) { return fail(Error.INVALID_LIQUIDATION_INCENTIVE, FailureInfo.SET_LIQUIDATION_INCENTIVE_VALIDATION); } Exp memory maxLiquidationIncentive = Exp({mantissa: liquidationIncentiveMaxMantissa}); if (lessThanExp(maxLiquidationIncentive, newLiquidationIncentive)) { return fail(Error.INVALID_LIQUIDATION_INCENTIVE, FailureInfo.SET_LIQUIDATION_INCENTIVE_VALIDATION); } // Save current value for use in log uint oldLiquidationIncentiveMantissa = liquidationIncentiveMantissa; // Set liquidation incentive to new incentive liquidationIncentiveMantissa = newLiquidationIncentiveMantissa; // Emit event with old incentive, new incentive emit NewLiquidationIncentive(oldLiquidationIncentiveMantissa, newLiquidationIncentiveMantissa); return uint(Error.NO_ERROR); } /** * @notice Add the market to the markets mapping and set it as listed * @dev Admin function to set isListed and add support for the market * @param cToken The address of the market (token) to list * @return uint 0=success, otherwise a failure. (See enum Error for details) */ function _supportMarket(CToken cToken) internal returns (uint) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SUPPORT_MARKET_OWNER_CHECK); } // Is market already listed? if (markets[address(cToken)].isListed) { return fail(Error.MARKET_ALREADY_LISTED, FailureInfo.SUPPORT_MARKET_EXISTS); } // Sanity check to make sure its really a CToken require(cToken.isCToken(), "marker method returned false"); // Check cToken.comptroller == this require(address(cToken.comptroller()) == address(this), "Cannot support a market with a different Comptroller."); // Make sure market is not already listed address underlying = cToken.isCEther() ? address(0) : CErc20(address(cToken)).underlying(); if (address(cTokensByUnderlying[underlying]) != address(0)) { return fail(Error.MARKET_ALREADY_LISTED, FailureInfo.SUPPORT_MARKET_EXISTS); } // List market and emit event markets[address(cToken)] = Market({isListed: true, collateralFactorMantissa: 0}); allMarkets.push(cToken); cTokensByUnderlying[underlying] = cToken; emit MarketListed(cToken); return uint(Error.NO_ERROR); } /** * @notice Deploy cToken, add the market to the markets mapping, and set it as listed and set the collateral factor * @dev Admin function to deploy cToken, set isListed, and add support for the market and set the collateral factor * @return uint 0=success, otherwise a failure. (See enum Error for details) */ function _deployMarket( bool isCEther, bytes calldata constructorData, uint collateralFactorMantissa ) external returns (uint) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SUPPORT_MARKET_OWNER_CHECK); } // Temporarily enable Fuse admin rights for asset deployment (storing the original value) bool oldFuseAdminHasRights = fuseAdminHasRights; fuseAdminHasRights = true; // Deploy via Fuse admin CToken cToken = CToken(isCEther ? fuseAdmin.deployCEther(constructorData) : fuseAdmin.deployCErc20(constructorData)); // Reset Fuse admin rights to the original value fuseAdminHasRights = oldFuseAdminHasRights; // Support market here in the Comptroller uint256 err = _supportMarket(cToken); // Set collateral factor return err == uint(Error.NO_ERROR) ? _setCollateralFactor(cToken, collateralFactorMantissa) : err; } /** * @notice Removed a market from the markets mapping and sets it as unlisted * @dev Admin function unset isListed and collateralFactorMantissa and unadd support for the market * @param cToken The address of the market (token) to unlist * @return uint 0=success, otherwise a failure. (See enum Error for details) */ function _unsupportMarket(CToken cToken) external returns (uint) { // Check admin rights if (!hasAdminRights()) return fail(Error.UNAUTHORIZED, FailureInfo.UNSUPPORT_MARKET_OWNER_CHECK); // Check if market is already unlisted if (!markets[address(cToken)].isListed) return fail(Error.MARKET_NOT_LISTED, FailureInfo.UNSUPPORT_MARKET_DOES_NOT_EXIST); // Check if market is in use if (cToken.totalSupply() > 0) return fail(Error.NONZERO_TOTAL_SUPPLY, FailureInfo.UNSUPPORT_MARKET_IN_USE); // Unlist market delete markets[address(cToken)]; /* Delete cToken from allMarkets */ // load into memory for faster iteration CToken[] memory _allMarkets = allMarkets; uint len = _allMarkets.length; uint assetIndex = len; for (uint i = 0; i < len; i++) { if (_allMarkets[i] == cToken) { assetIndex = i; break; } } // We *must* have found the asset in the list or our redundant data structure is broken assert(assetIndex < len); // copy last item in list to location of item to be removed, reduce length by 1 allMarkets[assetIndex] = allMarkets[allMarkets.length - 1]; allMarkets.length--; cTokensByUnderlying[cToken.isCEther() ? address(0) : CErc20(address(cToken)).underlying()] = CToken(address(0)); emit MarketUnlisted(cToken); return uint(Error.NO_ERROR); } /** * @notice Toggles the auto-implementation feature * @param enabled If the feature is to be enabled * @return uint 0=success, otherwise a failure. (See enum Error for details) */ function _toggleAutoImplementations(bool enabled) public returns (uint) { if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.TOGGLE_AUTO_IMPLEMENTATIONS_ENABLED_OWNER_CHECK); } // Return no error if already set to the desired value if (autoImplementation == enabled) return uint(Error.NO_ERROR); // Store autoImplementation with value enabled autoImplementation = enabled; // Emit AutoImplementationsToggled(enabled) emit AutoImplementationsToggled(enabled); return uint(Error.NO_ERROR); } /** * @notice Set the given supply caps for the given cToken markets. Supplying that brings total underlying supply to or above supply cap will revert. * @dev Admin or borrowCapGuardian function to set the supply caps. A supply cap of 0 corresponds to unlimited supplying. * @param cTokens The addresses of the markets (tokens) to change the supply caps for * @param newSupplyCaps The new supply cap values in underlying to be set. A value of 0 corresponds to unlimited supplying. */ function _setMarketSupplyCaps(CToken[] calldata cTokens, uint[] calldata newSupplyCaps) external { require(msg.sender == admin || msg.sender == borrowCapGuardian, "only admin or borrow cap guardian can set supply caps"); uint numMarkets = cTokens.length; uint numSupplyCaps = newSupplyCaps.length; require(numMarkets != 0 && numMarkets == numSupplyCaps, "invalid input"); for(uint i = 0; i < numMarkets; i++) { supplyCaps[address(cTokens[i])] = newSupplyCaps[i]; emit NewSupplyCap(cTokens[i], newSupplyCaps[i]); } } /** * @notice Set the given borrow caps for the given cToken markets. Borrowing that brings total borrows to or above borrow cap will revert. * @dev Admin or borrowCapGuardian function to set the borrow caps. A borrow cap of 0 corresponds to unlimited borrowing. * @param cTokens The addresses of the markets (tokens) to change the borrow caps for * @param newBorrowCaps The new borrow cap values in underlying to be set. A value of 0 corresponds to unlimited borrowing. */ function _setMarketBorrowCaps(CToken[] calldata cTokens, uint[] calldata newBorrowCaps) external { require(msg.sender == admin || msg.sender == borrowCapGuardian, "only admin or borrow cap guardian can set borrow caps"); uint numMarkets = cTokens.length; uint numBorrowCaps = newBorrowCaps.length; require(numMarkets != 0 && numMarkets == numBorrowCaps, "invalid input"); for(uint i = 0; i < numMarkets; i++) { borrowCaps[address(cTokens[i])] = newBorrowCaps[i]; emit NewBorrowCap(cTokens[i], newBorrowCaps[i]); } } /** * @notice Admin function to change the Borrow Cap Guardian * @param newBorrowCapGuardian The address of the new Borrow Cap Guardian */ function _setBorrowCapGuardian(address newBorrowCapGuardian) external { require(msg.sender == admin, "only admin can set borrow cap guardian"); // Save current value for inclusion in log address oldBorrowCapGuardian = borrowCapGuardian; // Store borrowCapGuardian with value newBorrowCapGuardian borrowCapGuardian = newBorrowCapGuardian; // Emit NewBorrowCapGuardian(OldBorrowCapGuardian, NewBorrowCapGuardian) emit NewBorrowCapGuardian(oldBorrowCapGuardian, newBorrowCapGuardian); } /** * @notice Admin function to change the Pause Guardian * @param newPauseGuardian The address of the new Pause Guardian * @return uint 0=success, otherwise a failure. (See enum Error for details) */ function _setPauseGuardian(address newPauseGuardian) public returns (uint) { if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_PAUSE_GUARDIAN_OWNER_CHECK); } // Save current value for inclusion in log address oldPauseGuardian = pauseGuardian; // Store pauseGuardian with value newPauseGuardian pauseGuardian = newPauseGuardian; // Emit NewPauseGuardian(OldPauseGuardian, NewPauseGuardian) emit NewPauseGuardian(oldPauseGuardian, pauseGuardian); return uint(Error.NO_ERROR); } function _setMintPaused(CToken cToken, bool state) public returns (bool) { require(markets[address(cToken)].isListed, "cannot pause a market that is not listed"); require(msg.sender == pauseGuardian || hasAdminRights(), "only pause guardian and admin can pause"); require(hasAdminRights() || state == true, "only admin can unpause"); mintGuardianPaused[address(cToken)] = state; emit ActionPaused(cToken, "Mint", state); return state; } function _setBorrowPaused(CToken cToken, bool state) public returns (bool) { require(markets[address(cToken)].isListed, "cannot pause a market that is not listed"); require(msg.sender == pauseGuardian || hasAdminRights(), "only pause guardian and admin can pause"); require(hasAdminRights() || state == true, "only admin can unpause"); borrowGuardianPaused[address(cToken)] = state; emit ActionPaused(cToken, "Borrow", state); return state; } function _setTransferPaused(bool state) public returns (bool) { require(msg.sender == pauseGuardian || hasAdminRights(), "only pause guardian and admin can pause"); require(hasAdminRights() || state == true, "only admin can unpause"); transferGuardianPaused = state; emit ActionPaused("Transfer", state); return state; } function _setSeizePaused(bool state) public returns (bool) { require(msg.sender == pauseGuardian || hasAdminRights(), "only pause guardian and admin can pause"); require(hasAdminRights() || state == true, "only admin can unpause"); seizeGuardianPaused = state; emit ActionPaused("Seize", state); return state; } function _become(Unitroller unitroller) public { require((msg.sender == address(fuseAdmin) && unitroller.fuseAdminHasRights()) || (msg.sender == unitroller.admin() && unitroller.adminHasRights()), "only unitroller admin can change brains"); uint changeStatus = unitroller._acceptImplementation(); require(changeStatus == 0, "change not authorized"); Comptroller(address(unitroller))._becomeImplementation(); } function _becomeImplementation() external { require(msg.sender == comptrollerImplementation, "only implementation may call _becomeImplementation"); if (!_notEnteredInitialized) { _notEntered = true; _notEnteredInitialized = true; } } /*** Helper Functions ***/ /** * @notice Return all of the markets * @dev The automatic getter may be used to access an individual market. * @return The list of market addresses */ function getAllMarkets() public view returns (CToken[] memory) { return allMarkets; } /** * @notice Return all of the borrowers * @dev The automatic getter may be used to access an individual borrower. * @return The list of borrower account addresses */ function getAllBorrowers() public view returns (address[] memory) { return allBorrowers; } /** * @notice Return all of the whitelist * @dev The automatic getter may be used to access an individual whitelist status. * @return The list of borrower account addresses */ function getWhitelist() external view returns (address[] memory) { return whitelistArray; } /** * @notice Returns an array of all RewardsDistributors */ function getRewardsDistributors() external view returns (address[] memory) { return rewardsDistributors; } /** * @notice Returns true if the given cToken market has been deprecated * @dev All borrows in a deprecated cToken market can be immediately liquidated * @param cToken The market to check if deprecated */ function isDeprecated(CToken cToken) public view returns (bool) { return markets[address(cToken)].collateralFactorMantissa == 0 && borrowGuardianPaused[address(cToken)] == true && add_(add_(cToken.reserveFactorMantissa(), cToken.adminFeeMantissa()), cToken.fuseFeeMantissa()) == 1e18 ; } /*** Pool-Wide/Cross-Asset Reentrancy Prevention ***/ /** * @dev Called by cTokens before a non-reentrant function for pool-wide reentrancy prevention. * Prevents pool-wide/cross-asset reentrancy exploits like AMP on Cream. */ function _beforeNonReentrant() external { require(markets[msg.sender].isListed, "Comptroller:_beforeNonReentrant: caller not listed as market"); require(_notEntered, "re-entered across assets"); _notEntered = false; } /** * @dev Called by cTokens after a non-reentrant function for pool-wide reentrancy prevention. * Prevents pool-wide/cross-asset reentrancy exploits like AMP on Cream. */ function _afterNonReentrant() external { require(markets[msg.sender].isListed, "Comptroller:_afterNonReentrant: caller not listed as market"); _notEntered = true; // get a gas-refund post-Istanbul } }
pragma solidity ^0.5.16; contract ComptrollerInterface { /// @notice Indicator that this is a Comptroller contract (for inspection) bool public constant isComptroller = true; /*** Assets You Are In ***/ function enterMarkets(address[] calldata cTokens) external returns (uint[] memory); function exitMarket(address cToken) external returns (uint); /*** Policy Hooks ***/ function mintAllowed(address cToken, address minter, uint mintAmount) external returns (uint); function mintWithinLimits(address cToken, uint exchangeRateMantissa, uint accountTokens, uint mintAmount) external returns (uint); function mintVerify(address cToken, address minter, uint mintAmount, uint mintTokens) external; function redeemAllowed(address cToken, address redeemer, uint redeemTokens) external returns (uint); function redeemVerify(address cToken, address redeemer, uint redeemAmount, uint redeemTokens) external; function borrowAllowed(address cToken, address borrower, uint borrowAmount) external returns (uint); function borrowWithinLimits(address cToken, uint accountBorrowsNew) external returns (uint); function borrowVerify(address cToken, address borrower, uint borrowAmount) external; function repayBorrowAllowed( address cToken, address payer, address borrower, uint repayAmount) external returns (uint); function repayBorrowVerify( address cToken, address payer, address borrower, uint repayAmount, uint borrowerIndex) external; function liquidateBorrowAllowed( address cTokenBorrowed, address cTokenCollateral, address liquidator, address borrower, uint repayAmount) external returns (uint); function liquidateBorrowVerify( address cTokenBorrowed, address cTokenCollateral, address liquidator, address borrower, uint repayAmount, uint seizeTokens) external; function seizeAllowed( address cTokenCollateral, address cTokenBorrowed, address liquidator, address borrower, uint seizeTokens) external returns (uint); function seizeVerify( address cTokenCollateral, address cTokenBorrowed, address liquidator, address borrower, uint seizeTokens) external; function transferAllowed(address cToken, address src, address dst, uint transferTokens) external returns (uint); function transferVerify(address cToken, address src, address dst, uint transferTokens) external; /*** Liquidity/Liquidation Calculations ***/ function liquidateCalculateSeizeTokens( address cTokenBorrowed, address cTokenCollateral, uint repayAmount) external view returns (uint, uint); /*** Pool-Wide/Cross-Asset Reentrancy Prevention ***/ function _beforeNonReentrant() external; function _afterNonReentrant() external; }
pragma solidity ^0.5.16; import "./IFuseFeeDistributor.sol"; import "./CToken.sol"; import "./PriceOracle.sol"; contract UnitrollerAdminStorage { /** * @notice Administrator for Fuse */ IFuseFeeDistributor internal constant fuseAdmin = IFuseFeeDistributor(0xa731585ab05fC9f83555cf9Bff8F58ee94e18F85); /** * @notice Administrator for this contract */ address public admin; /** * @notice Pending administrator for this contract */ address public pendingAdmin; /** * @notice Whether or not the Fuse admin has admin rights */ bool public fuseAdminHasRights = true; /** * @notice Whether or not the admin has admin rights */ bool public adminHasRights = true; /** * @notice Returns a boolean indicating if the sender has admin rights */ function hasAdminRights() internal view returns (bool) { return (msg.sender == admin && adminHasRights) || (msg.sender == address(fuseAdmin) && fuseAdminHasRights); } /** * @notice Active brains of Unitroller */ address public comptrollerImplementation; /** * @notice Pending brains of Unitroller */ address public pendingComptrollerImplementation; } contract ComptrollerV1Storage is UnitrollerAdminStorage { /** * @notice Oracle which gives the price of any given asset */ PriceOracle public oracle; /** * @notice Multiplier used to calculate the maximum repayAmount when liquidating a borrow */ uint public closeFactorMantissa; /** * @notice Multiplier representing the discount on collateral that a liquidator receives */ uint public liquidationIncentiveMantissa; /** * @notice UNUSED AFTER UPGRADE: Max number of assets a single account can participate in (borrow or use as collateral) */ uint internal maxAssets; /** * @notice Per-account mapping of "assets you are in", capped by maxAssets */ mapping(address => CToken[]) public accountAssets; } contract ComptrollerV2Storage is ComptrollerV1Storage { struct Market { /** * @notice Whether or not this market is listed */ bool isListed; /** * @notice Multiplier representing the most one can borrow against their collateral in this market. * For instance, 0.9 to allow borrowing 90% of collateral value. * Must be between 0 and 1, and stored as a mantissa. */ uint collateralFactorMantissa; /** * @notice Per-market mapping of "accounts in this asset" */ mapping(address => bool) accountMembership; } /** * @notice Official mapping of cTokens -> Market metadata * @dev Used e.g. to determine if a market is supported */ mapping(address => Market) public markets; /// @notice A list of all markets CToken[] public allMarkets; /** * @dev Maps borrowers to booleans indicating if they have entered any markets */ mapping(address => bool) internal borrowers; /// @notice A list of all borrowers who have entered markets address[] public allBorrowers; /// @notice Indexes of borrower account addresses in the `allBorrowers` array mapping(address => uint256) internal borrowerIndexes; /** * @dev Maps suppliers to booleans indicating if they have ever supplied to any markets */ mapping(address => bool) public suppliers; /// @notice All cTokens addresses mapped by their underlying token addresses mapping(address => CToken) public cTokensByUnderlying; /// @notice Whether or not the supplier whitelist is enforced bool public enforceWhitelist; /// @notice Maps addresses to booleans indicating if they are allowed to supply assets (i.e., mint cTokens) mapping(address => bool) public whitelist; /// @notice An array of all whitelisted accounts address[] public whitelistArray; /// @notice Indexes of account addresses in the `whitelistArray` array mapping(address => uint256) internal whitelistIndexes; /** * @notice The Pause Guardian can pause certain actions as a safety mechanism. * Actions which allow users to remove their own assets cannot be paused. * Liquidation / seizing / transfer can only be paused globally, not by market. */ address public pauseGuardian; bool public _mintGuardianPaused; bool public _borrowGuardianPaused; bool public transferGuardianPaused; bool public seizeGuardianPaused; mapping(address => bool) public mintGuardianPaused; mapping(address => bool) public borrowGuardianPaused; } contract ComptrollerV3Storage is ComptrollerV2Storage { /** * @dev Whether or not the implementation should be auto-upgraded. */ bool public autoImplementation; /// @notice The borrowCapGuardian can set borrowCaps to any number for any market. Lowering the borrow cap could disable borrowing on the given market. address public borrowCapGuardian; /// @notice Borrow caps enforced by borrowAllowed for each cToken address. Defaults to zero which corresponds to unlimited borrowing. mapping(address => uint) public borrowCaps; /// @notice Supply caps enforced by mintAllowed for each cToken address. Defaults to zero which corresponds to unlimited supplying. mapping(address => uint) public supplyCaps; /// @notice RewardsDistributor contracts to notify of flywheel changes. address[] public rewardsDistributors; /// @dev Guard variable for pool-wide/cross-asset re-entrancy checks bool internal _notEntered; /// @dev Whether or not _notEntered has been initialized bool internal _notEnteredInitialized; }
pragma solidity ^0.5.16; import "./ComptrollerInterface.sol"; import "./CTokenInterfaces.sol"; import "./ErrorReporter.sol"; import "./Exponential.sol"; import "./EIP20Interface.sol"; import "./EIP20NonStandardInterface.sol"; import "./InterestRateModel.sol"; /** * @title Compound's CToken Contract * @notice Abstract base for CTokens * @author Compound */ contract CToken is CTokenInterface, Exponential, TokenErrorReporter { /** * @notice Returns a boolean indicating if the sender has admin rights */ function hasAdminRights() internal view returns (bool) { ComptrollerV3Storage comptrollerStorage = ComptrollerV3Storage(address(comptroller)); return (msg.sender == comptrollerStorage.admin() && comptrollerStorage.adminHasRights()) || (msg.sender == address(fuseAdmin) && comptrollerStorage.fuseAdminHasRights()); } /** * @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_, uint256 reserveFactorMantissa_, uint256 adminFeeMantissa_) public { require(msg.sender == address(fuseAdmin), "only Fuse admin may initialize the market"); require(accrualBlockNumber == 0 && borrowIndex == 0, "market may only be initialized once"); // Set initial exchange rate initialExchangeRateMantissa = initialExchangeRateMantissa_; require(initialExchangeRateMantissa > 0, "initial exchange rate must be greater than zero."); // Set the comptroller uint err = _setComptroller(comptroller_); require(err == uint(Error.NO_ERROR), "setting comptroller failed"); // Initialize block 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_); require(err == uint(Error.NO_ERROR), "setting interest rate model failed"); name = name_; symbol = symbol_; decimals = decimals_; // Set reserve factor err = _setReserveFactorFresh(reserveFactorMantissa_); require(err == uint(Error.NO_ERROR), "setting reserve factor failed"); // Set admin fee err = _setAdminFeeFresh(adminFeeMantissa_); require(err == uint(Error.NO_ERROR), "setting admin fee failed"); // The counter starts true to prevent changing it from zero to non-zero (i.e. smaller cost/refund) _notEntered = true; } /** * @dev Returns latest pending Fuse fee (to be set with `_setFuseFeeFresh`) */ function getPendingFuseFeeFromAdmin() internal view returns (uint) { return fuseAdmin.interestFeeRate(); } /** * @notice Transfer `tokens` tokens from `src` to `dst` by `spender` * @dev Called by both `transfer` and `transferFrom` internally * @param spender The address of the account performing the transfer * @param src The address of the source account * @param dst The address of the destination account * @param tokens The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transferTokens(address spender, address src, address dst, uint tokens) internal returns (uint) { /* Fail if transfer not allowed */ uint allowed = comptroller.transferAllowed(address(this), src, dst, tokens); if (allowed != 0) { return failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.TRANSFER_COMPTROLLER_REJECTION, allowed); } /* Do not allow self-transfers */ if (src == dst) { return fail(Error.BAD_INPUT, FailureInfo.TRANSFER_NOT_ALLOWED); } /* Get the allowance, infinite for the account owner */ uint startingAllowance = 0; if (spender == src) { startingAllowance = uint(-1); } else { startingAllowance = transferAllowances[src][spender]; } /* Do the calculations, checking for {under,over}flow */ MathError mathErr; uint allowanceNew; uint srcTokensNew; uint dstTokensNew; (mathErr, allowanceNew) = subUInt(startingAllowance, tokens); if (mathErr != MathError.NO_ERROR) { return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_NOT_ALLOWED); } (mathErr, srcTokensNew) = subUInt(accountTokens[src], tokens); if (mathErr != MathError.NO_ERROR) { return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_NOT_ENOUGH); } (mathErr, dstTokensNew) = addUInt(accountTokens[dst], tokens); if (mathErr != MathError.NO_ERROR) { return fail(Error.MATH_ERROR, FailureInfo.TRANSFER_TOO_MUCH); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) accountTokens[src] = srcTokensNew; accountTokens[dst] = dstTokensNew; /* Eat some of the allowance (if necessary) */ if (startingAllowance != uint(-1)) { transferAllowances[src][spender] = allowanceNew; } /* We emit a Transfer event */ emit Transfer(src, dst, tokens); /* We call the defense hook */ // unused function // comptroller.transferVerify(address(this), src, dst, tokens); return uint(Error.NO_ERROR); } /** * @notice Transfer `amount` tokens from `msg.sender` to `dst` * @param dst The address of the destination account * @param amount The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transfer(address dst, uint256 amount) external nonReentrant(false) returns (bool) { return transferTokens(msg.sender, msg.sender, dst, amount) == uint(Error.NO_ERROR); } /** * @notice Transfer `amount` tokens from `src` to `dst` * @param src The address of the source account * @param dst The address of the destination account * @param amount The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transferFrom(address src, address dst, uint256 amount) external nonReentrant(false) returns (bool) { return transferTokens(msg.sender, src, dst, amount) == uint(Error.NO_ERROR); } /** * @notice Approve `spender` to transfer up to `amount` from `src` * @dev This will overwrite the approval amount for `spender` * and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve) * @param spender The address of the account which may transfer tokens * @param amount The number of tokens that are approved (-1 means infinite) * @return Whether or not the approval succeeded */ function approve(address spender, uint256 amount) external returns (bool) { address src = msg.sender; transferAllowances[src][spender] = amount; emit Approval(src, spender, amount); return true; } /** * @notice Get the current allowance from `owner` for `spender` * @param owner The address of the account which owns the tokens to be spent * @param spender The address of the account which may transfer tokens * @return The number of tokens allowed to be spent (-1 means infinite) */ function allowance(address owner, address spender) external view returns (uint256) { return transferAllowances[owner][spender]; } /** * @notice Get the token balance of the `owner` * @param owner The address of the account to query * @return The number of tokens owned by `owner` */ function balanceOf(address owner) external view returns (uint256) { return accountTokens[owner]; } /** * @notice Get the underlying balance of the `owner` * @dev This also accrues interest in a transaction * @param owner The address of the account to query * @return The amount of underlying owned by `owner` */ function balanceOfUnderlying(address owner) external returns (uint) { Exp memory exchangeRate = Exp({mantissa: exchangeRateCurrent()}); (MathError mErr, uint balance) = mulScalarTruncate(exchangeRate, accountTokens[owner]); require(mErr == MathError.NO_ERROR, "balance could not be calculated"); return balance; } /** * @notice Get a snapshot of the account's balances, and the cached exchange rate * @dev This is used by comptroller to more efficiently perform liquidity checks. * @param account Address of the account to snapshot * @return (possible error, token balance, borrow balance, exchange rate mantissa) */ function getAccountSnapshot(address account) external view returns (uint, uint, uint, uint) { uint cTokenBalance = accountTokens[account]; uint borrowBalance; uint exchangeRateMantissa; MathError mErr; (mErr, borrowBalance) = borrowBalanceStoredInternal(account); if (mErr != MathError.NO_ERROR) { return (uint(Error.MATH_ERROR), 0, 0, 0); } (mErr, exchangeRateMantissa) = exchangeRateStoredInternal(); if (mErr != MathError.NO_ERROR) { return (uint(Error.MATH_ERROR), 0, 0, 0); } return (uint(Error.NO_ERROR), cTokenBalance, borrowBalance, exchangeRateMantissa); } /** * @dev Function to simply retrieve block number * This exists mainly for inheriting test contracts to stub this result. */ function getBlockNumber() internal view returns (uint) { return block.number; } /** * @notice Returns the current per-block borrow interest rate for this cToken * @return The borrow interest rate per block, scaled by 1e18 */ function borrowRatePerBlock() external view returns (uint) { return interestRateModel.getBorrowRate(getCashPrior(), totalBorrows, add_(totalReserves, add_(totalAdminFees, totalFuseFees))); } /** * @notice Returns the current per-block supply interest rate for this cToken * @return The supply interest rate per block, scaled by 1e18 */ function supplyRatePerBlock() external view returns (uint) { return interestRateModel.getSupplyRate(getCashPrior(), totalBorrows, add_(totalReserves, add_(totalAdminFees, totalFuseFees)), reserveFactorMantissa + fuseFeeMantissa + adminFeeMantissa); } /** * @notice Returns the current total borrows plus accrued interest * @return The total borrows with interest */ function totalBorrowsCurrent() external nonReentrant(false) returns (uint) { require(accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed"); return totalBorrows; } /** * @notice Accrue interest to updated borrowIndex and then calculate account's borrow balance using the updated borrowIndex * @param account The address whose balance should be calculated after updating borrowIndex * @return The calculated balance */ function borrowBalanceCurrent(address account) external nonReentrant(false) returns (uint) { require(accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed"); return borrowBalanceStored(account); } /** * @notice Return the borrow balance of account based on stored data * @param account The address whose balance should be calculated * @return The calculated balance */ function borrowBalanceStored(address account) public view returns (uint) { (MathError err, uint result) = borrowBalanceStoredInternal(account); require(err == MathError.NO_ERROR, "borrowBalanceStored: borrowBalanceStoredInternal failed"); return result; } /** * @notice Return the borrow balance of account based on stored data * @param account The address whose balance should be calculated * @return (error code, the calculated balance or 0 if error code is non-zero) */ function borrowBalanceStoredInternal(address account) internal view returns (MathError, uint) { /* Note: we do not assert that the market is up to date */ MathError mathErr; uint principalTimesIndex; uint result; /* Get borrowBalance and borrowIndex */ BorrowSnapshot storage borrowSnapshot = accountBorrows[account]; /* If borrowBalance = 0 then borrowIndex is likely also 0. * Rather than failing the calculation with a division by 0, we immediately return 0 in this case. */ if (borrowSnapshot.principal == 0) { return (MathError.NO_ERROR, 0); } /* Calculate new borrow balance using the interest index: * recentBorrowBalance = borrower.borrowBalance * market.borrowIndex / borrower.borrowIndex */ (mathErr, principalTimesIndex) = mulUInt(borrowSnapshot.principal, borrowIndex); if (mathErr != MathError.NO_ERROR) { return (mathErr, 0); } (mathErr, result) = divUInt(principalTimesIndex, borrowSnapshot.interestIndex); if (mathErr != MathError.NO_ERROR) { return (mathErr, 0); } return (MathError.NO_ERROR, result); } /** * @notice Accrue interest then return the up-to-date exchange rate * @return Calculated exchange rate scaled by 1e18 */ function exchangeRateCurrent() public nonReentrant(false) returns (uint) { require(accrueInterest() == uint(Error.NO_ERROR), "accrue interest failed"); 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() public view returns (uint) { (MathError err, uint result) = exchangeRateStoredInternal(); require(err == MathError.NO_ERROR, "exchangeRateStored: exchangeRateStoredInternal failed"); return result; } /** * @notice Calculates the exchange rate from the underlying to the CToken * @dev This function does not accrue interest before calculating the exchange rate * @return (error code, calculated exchange rate scaled by 1e18) */ function exchangeRateStoredInternal() internal view returns (MathError, uint) { uint _totalSupply = totalSupply; if (_totalSupply == 0) { /* * If there are no tokens minted: * exchangeRate = initialExchangeRate */ return (MathError.NO_ERROR, initialExchangeRateMantissa); } else { /* * Otherwise: * exchangeRate = (totalCash + totalBorrows - (totalReserves + totalFuseFees + totalAdminFees)) / totalSupply */ uint totalCash = getCashPrior(); uint cashPlusBorrowsMinusReserves; Exp memory exchangeRate; MathError mathErr; (mathErr, cashPlusBorrowsMinusReserves) = addThenSubUInt(totalCash, totalBorrows, add_(totalReserves, add_(totalAdminFees, totalFuseFees))); if (mathErr != MathError.NO_ERROR) { return (mathErr, 0); } (mathErr, exchangeRate) = getExp(cashPlusBorrowsMinusReserves, _totalSupply); if (mathErr != MathError.NO_ERROR) { return (mathErr, 0); } return (MathError.NO_ERROR, exchangeRate.mantissa); } } /** * @notice Get cash balance of this cToken in the underlying asset * @return The quantity of underlying asset owned by this contract */ function getCash() external view returns (uint) { return getCashPrior(); } /** * @notice Applies accrued interest to total borrows and reserves * @dev This calculates interest accrued from the last checkpointed block * up to the current block and writes new checkpoint to storage. */ function accrueInterest() public returns (uint) { /* Remember the initial block number */ uint currentBlockNumber = getBlockNumber(); /* Short-circuit accumulating 0 interest */ if (accrualBlockNumber == currentBlockNumber) { return uint(Error.NO_ERROR); } /* Read the previous values out of storage */ uint cashPrior = getCashPrior(); /* Calculate the current borrow interest rate */ uint borrowRateMantissa = interestRateModel.getBorrowRate(cashPrior, totalBorrows, add_(totalReserves, add_(totalAdminFees, totalFuseFees))); require(borrowRateMantissa <= borrowRateMaxMantissa, "borrow rate is absurdly high"); /* Calculate the number of blocks elapsed since the last accrual */ (MathError mathErr, uint blockDelta) = subUInt(currentBlockNumber, accrualBlockNumber); require(mathErr == MathError.NO_ERROR, "could not calculate block delta"); return finishInterestAccrual(currentBlockNumber, cashPrior, borrowRateMantissa, blockDelta); } /** * @dev Split off from `accrueInterest` to avoid "stack too deep" error". */ function finishInterestAccrual(uint currentBlockNumber, uint cashPrior, uint borrowRateMantissa, uint blockDelta) private returns (uint) { /* * 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 * totalFuseFeesNew = interestAccumulated * fuseFee + totalFuseFees * totalAdminFeesNew = interestAccumulated * adminFee + totalAdminFees * borrowIndexNew = simpleInterestFactor * borrowIndex + borrowIndex */ Exp memory simpleInterestFactor = mul_(Exp({mantissa: borrowRateMantissa}), blockDelta); uint interestAccumulated = mul_ScalarTruncate(simpleInterestFactor, totalBorrows); uint totalBorrowsNew = add_(interestAccumulated, totalBorrows); uint totalReservesNew = mul_ScalarTruncateAddUInt(Exp({mantissa: reserveFactorMantissa}), interestAccumulated, totalReserves); uint totalFuseFeesNew = mul_ScalarTruncateAddUInt(Exp({mantissa: fuseFeeMantissa}), interestAccumulated, totalFuseFees); uint totalAdminFeesNew = mul_ScalarTruncateAddUInt(Exp({mantissa: adminFeeMantissa}), interestAccumulated, totalAdminFees); uint borrowIndexNew = mul_ScalarTruncateAddUInt(simpleInterestFactor, borrowIndex, borrowIndex); ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* We write the previously calculated values into storage */ accrualBlockNumber = currentBlockNumber; borrowIndex = borrowIndexNew; totalBorrows = totalBorrowsNew; totalReserves = totalReservesNew; totalFuseFees = totalFuseFeesNew; totalAdminFees = totalAdminFeesNew; /* We emit an AccrueInterest event */ emit AccrueInterest(cashPrior, interestAccumulated, borrowIndexNew, totalBorrowsNew); // Attempt to add interest checkpoint address(interestRateModel).call(abi.encodeWithSignature("checkpointInterest(uint256)", borrowRateMantissa)); return uint(Error.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 * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual mint amount. */ function mintInternal(uint mintAmount) internal nonReentrant(false) returns (uint, uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed return (fail(Error(error), FailureInfo.MINT_ACCRUE_INTEREST_FAILED), 0); } // mintFresh emits the actual Mint event if successful and logs on errors, so we don't need to return mintFresh(msg.sender, mintAmount); } struct MintLocalVars { Error err; MathError mathErr; uint exchangeRateMantissa; uint mintTokens; uint totalSupplyNew; uint accountTokensNew; uint actualMintAmount; } /** * @notice User supplies assets into the market and receives cTokens in exchange * @dev Assumes interest has already been accrued up to the current block * @param minter The address of the account which is supplying the assets * @param mintAmount The amount of the underlying asset to supply * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual mint amount. */ function mintFresh(address minter, uint mintAmount) internal returns (uint, uint) { /* Fail if mint not allowed */ uint allowed = comptroller.mintAllowed(address(this), minter, mintAmount); if (allowed != 0) { return (failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.MINT_COMPTROLLER_REJECTION, allowed), 0); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { return (fail(Error.MARKET_NOT_FRESH, FailureInfo.MINT_FRESHNESS_CHECK), 0); } MintLocalVars memory vars; (vars.mathErr, vars.exchangeRateMantissa) = exchangeRateStoredInternal(); if (vars.mathErr != MathError.NO_ERROR) { return (failOpaque(Error.MATH_ERROR, FailureInfo.MINT_EXCHANGE_RATE_READ_FAILED, uint(vars.mathErr)), 0); } // Check max supply // unused function /* allowed = comptroller.mintWithinLimits(address(this), vars.exchangeRateMantissa, accountTokens[minter], mintAmount); if (allowed != 0) { return (failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.MINT_COMPTROLLER_REJECTION, allowed), 0); } */ ///////////////////////// // 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. */ vars.actualMintAmount = doTransferIn(minter, mintAmount); /* * We get the current exchange rate and calculate the number of cTokens to be minted: * mintTokens = actualMintAmount / exchangeRate */ (vars.mathErr, vars.mintTokens) = divScalarByExpTruncate(vars.actualMintAmount, Exp({mantissa: vars.exchangeRateMantissa})); require(vars.mathErr == MathError.NO_ERROR, "MINT_EXCHANGE_CALCULATION_FAILED"); /* * We calculate the new total supply of cTokens and minter token balance, checking for overflow: * totalSupplyNew = totalSupply + mintTokens * accountTokensNew = accountTokens[minter] + mintTokens */ vars.totalSupplyNew = add_(totalSupply, vars.mintTokens); vars.accountTokensNew = add_(accountTokens[minter], vars.mintTokens); /* We write previously calculated values into storage */ totalSupply = vars.totalSupplyNew; accountTokens[minter] = vars.accountTokensNew; /* We emit a Mint event, and a Transfer event */ emit Mint(minter, vars.actualMintAmount, vars.mintTokens); emit Transfer(address(this), minter, vars.mintTokens); /* We call the defense hook */ comptroller.mintVerify(address(this), minter, vars.actualMintAmount, vars.mintTokens); return (uint(Error.NO_ERROR), vars.actualMintAmount); } /** * @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 redeemInternal(uint redeemTokens) internal nonReentrant(false) returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed return fail(Error(error), FailureInfo.REDEEM_ACCRUE_INTEREST_FAILED); } // redeemFresh emits redeem-specific logs on errors, so we don't need to return redeemFresh(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 * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemUnderlyingInternal(uint redeemAmount) internal nonReentrant(false) returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed return fail(Error(error), FailureInfo.REDEEM_ACCRUE_INTEREST_FAILED); } // redeemFresh emits redeem-specific logs on errors, so we don't need to return redeemFresh(msg.sender, 0, redeemAmount); } struct RedeemLocalVars { Error err; MathError mathErr; uint exchangeRateMantissa; uint redeemTokens; uint redeemAmount; uint totalSupplyNew; uint accountTokensNew; } /** * @notice User redeems cTokens in exchange for the underlying asset * @dev Assumes interest has already been accrued up to the current block * @param redeemer The address of the account which is redeeming the tokens * @param redeemTokensIn The number of cTokens to redeem into underlying (only one of redeemTokensIn or redeemAmountIn may be non-zero) * @param redeemAmountIn The number of underlying tokens to receive from redeeming cTokens (only one of redeemTokensIn or redeemAmountIn may be non-zero) * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function redeemFresh(address payable redeemer, uint redeemTokensIn, uint redeemAmountIn) internal returns (uint) { require(redeemTokensIn == 0 || redeemAmountIn == 0, "one of redeemTokensIn or redeemAmountIn must be zero"); RedeemLocalVars memory vars; /* exchangeRate = invoke Exchange Rate Stored() */ (vars.mathErr, vars.exchangeRateMantissa) = exchangeRateStoredInternal(); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_EXCHANGE_RATE_READ_FAILED, uint(vars.mathErr)); } /* If redeemTokensIn > 0: */ if (redeemTokensIn > 0) { /* * We calculate the exchange rate and the amount of underlying to be redeemed: * redeemTokens = redeemTokensIn * redeemAmount = redeemTokensIn x exchangeRateCurrent */ vars.redeemTokens = redeemTokensIn; (vars.mathErr, vars.redeemAmount) = mulScalarTruncate(Exp({mantissa: vars.exchangeRateMantissa}), redeemTokensIn); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_EXCHANGE_TOKENS_CALCULATION_FAILED, uint(vars.mathErr)); } } else { /* * We get the current exchange rate and calculate the amount to be redeemed: * redeemTokens = redeemAmountIn / exchangeRate * redeemAmount = redeemAmountIn */ (vars.mathErr, vars.redeemTokens) = divScalarByExpTruncate(redeemAmountIn, Exp({mantissa: vars.exchangeRateMantissa})); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_EXCHANGE_AMOUNT_CALCULATION_FAILED, uint(vars.mathErr)); } vars.redeemAmount = redeemAmountIn; } /* Fail if redeem not allowed */ uint allowed = comptroller.redeemAllowed(address(this), redeemer, vars.redeemTokens); if (allowed != 0) { return failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.REDEEM_COMPTROLLER_REJECTION, allowed); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { return fail(Error.MARKET_NOT_FRESH, FailureInfo.REDEEM_FRESHNESS_CHECK); } /* * We calculate the new total supply and redeemer balance, checking for underflow: * totalSupplyNew = totalSupply - redeemTokens * accountTokensNew = accountTokens[redeemer] - redeemTokens */ (vars.mathErr, vars.totalSupplyNew) = subUInt(totalSupply, vars.redeemTokens); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_NEW_TOTAL_SUPPLY_CALCULATION_FAILED, uint(vars.mathErr)); } (vars.mathErr, vars.accountTokensNew) = subUInt(accountTokens[redeemer], vars.redeemTokens); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.REDEEM_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED, uint(vars.mathErr)); } /* Fail gracefully if protocol has insufficient cash */ if (getCashPrior() < vars.redeemAmount) { return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.REDEEM_TRANSFER_OUT_NOT_POSSIBLE); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We 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, vars.redeemAmount); /* We write previously calculated values into storage */ totalSupply = vars.totalSupplyNew; accountTokens[redeemer] = vars.accountTokensNew; /* We emit a Transfer event, and a Redeem event */ emit Transfer(redeemer, address(this), vars.redeemTokens); emit Redeem(redeemer, vars.redeemAmount, vars.redeemTokens); /* We call the defense hook */ comptroller.redeemVerify(address(this), redeemer, vars.redeemAmount, vars.redeemTokens); return uint(Error.NO_ERROR); } /** * @notice Sender borrows assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function borrowInternal(uint borrowAmount) internal nonReentrant(false) returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed return fail(Error(error), FailureInfo.BORROW_ACCRUE_INTEREST_FAILED); } // borrowFresh emits borrow-specific logs on errors, so we don't need to return borrowFresh(msg.sender, borrowAmount); } struct BorrowLocalVars { MathError mathErr; uint accountBorrows; uint accountBorrowsNew; uint totalBorrowsNew; } /** * @notice Users borrow assets from the protocol to their own address * @param borrowAmount The amount of the underlying asset to borrow * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function borrowFresh(address payable borrower, uint borrowAmount) internal returns (uint) { /* Fail if borrow not allowed */ uint allowed = comptroller.borrowAllowed(address(this), borrower, borrowAmount); if (allowed != 0) { return failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.BORROW_COMPTROLLER_REJECTION, allowed); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { return fail(Error.MARKET_NOT_FRESH, FailureInfo.BORROW_FRESHNESS_CHECK); } /* Fail gracefully if protocol has insufficient underlying cash */ uint cashPrior = getCashPrior(); if (cashPrior < borrowAmount) { return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.BORROW_CASH_NOT_AVAILABLE); } BorrowLocalVars memory vars; /* * We calculate the new borrower and total borrow balances, failing on overflow: * accountBorrowsNew = accountBorrows + borrowAmount * totalBorrowsNew = totalBorrows + borrowAmount */ (vars.mathErr, vars.accountBorrows) = borrowBalanceStoredInternal(borrower); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED, uint(vars.mathErr)); } (vars.mathErr, vars.accountBorrowsNew) = addUInt(vars.accountBorrows, borrowAmount); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED, uint(vars.mathErr)); } // Check min borrow for this user for this asset allowed = comptroller.borrowWithinLimits(address(this), vars.accountBorrowsNew); if (allowed != 0) { return failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.BORROW_COMPTROLLER_REJECTION, allowed); } (vars.mathErr, vars.totalBorrowsNew) = addUInt(totalBorrows, borrowAmount); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED, uint(vars.mathErr)); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We 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 write the previously calculated values into storage */ accountBorrows[borrower].principal = vars.accountBorrowsNew; accountBorrows[borrower].interestIndex = borrowIndex; totalBorrows = vars.totalBorrowsNew; /* We emit a Borrow event */ emit Borrow(borrower, borrowAmount, vars.accountBorrowsNew, vars.totalBorrowsNew); /* We call the defense hook */ // unused function // comptroller.borrowVerify(address(this), borrower, borrowAmount); return uint(Error.NO_ERROR); } /** * @notice Sender repays their own borrow * @param repayAmount The amount to repay * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount. */ function repayBorrowInternal(uint repayAmount) internal nonReentrant(false) returns (uint, uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed return (fail(Error(error), FailureInfo.REPAY_BORROW_ACCRUE_INTEREST_FAILED), 0); } // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to return repayBorrowFresh(msg.sender, msg.sender, repayAmount); } /** * @notice Sender repays a borrow belonging to borrower * @param borrower the account with the debt being payed off * @param repayAmount The amount to repay * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount. */ function repayBorrowBehalfInternal(address borrower, uint repayAmount) internal nonReentrant(false) returns (uint, uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed return (fail(Error(error), FailureInfo.REPAY_BEHALF_ACCRUE_INTEREST_FAILED), 0); } // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to return repayBorrowFresh(msg.sender, borrower, repayAmount); } struct RepayBorrowLocalVars { Error err; MathError mathErr; uint repayAmount; uint borrowerIndex; uint accountBorrows; uint accountBorrowsNew; uint totalBorrowsNew; uint actualRepayAmount; } /** * @notice Borrows are repaid by another user (possibly the borrower). * @param payer the account paying off the borrow * @param borrower the account with the debt being payed off * @param repayAmount the amount of undelrying tokens being returned * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount. */ function repayBorrowFresh(address payer, address borrower, uint repayAmount) internal returns (uint, uint) { /* Fail if repayBorrow not allowed */ uint allowed = comptroller.repayBorrowAllowed(address(this), payer, borrower, repayAmount); if (allowed != 0) { return (failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.REPAY_BORROW_COMPTROLLER_REJECTION, allowed), 0); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { return (fail(Error.MARKET_NOT_FRESH, FailureInfo.REPAY_BORROW_FRESHNESS_CHECK), 0); } RepayBorrowLocalVars memory vars; /* We remember the original borrowerIndex for verification purposes */ vars.borrowerIndex = accountBorrows[borrower].interestIndex; /* We fetch the amount the borrower owes, with accumulated interest */ (vars.mathErr, vars.accountBorrows) = borrowBalanceStoredInternal(borrower); if (vars.mathErr != MathError.NO_ERROR) { return (failOpaque(Error.MATH_ERROR, FailureInfo.REPAY_BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED, uint(vars.mathErr)), 0); } /* If repayAmount == -1, repayAmount = accountBorrows */ if (repayAmount == uint(-1)) { vars.repayAmount = vars.accountBorrows; } else { vars.repayAmount = repayAmount; } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* * We call doTransferIn for the payer and the repayAmount * Note: The 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. */ vars.actualRepayAmount = doTransferIn(payer, vars.repayAmount); /* * We calculate the new borrower and total borrow balances, failing on underflow: * accountBorrowsNew = accountBorrows - actualRepayAmount * totalBorrowsNew = totalBorrows - actualRepayAmount */ (vars.mathErr, vars.accountBorrowsNew) = subUInt(vars.accountBorrows, vars.actualRepayAmount); require(vars.mathErr == MathError.NO_ERROR, "REPAY_BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED"); (vars.mathErr, vars.totalBorrowsNew) = subUInt(totalBorrows, vars.actualRepayAmount); require(vars.mathErr == MathError.NO_ERROR, "REPAY_BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED"); /* We write the previously calculated values into storage */ accountBorrows[borrower].principal = vars.accountBorrowsNew; accountBorrows[borrower].interestIndex = borrowIndex; totalBorrows = vars.totalBorrowsNew; /* We emit a RepayBorrow event */ emit RepayBorrow(payer, borrower, vars.actualRepayAmount, vars.accountBorrowsNew, vars.totalBorrowsNew); /* We call the defense hook */ // unused function // comptroller.repayBorrowVerify(address(this), payer, borrower, vars.actualRepayAmount, vars.borrowerIndex); return (uint(Error.NO_ERROR), vars.actualRepayAmount); } /** * @notice The sender liquidates the borrowers collateral. * The collateral seized is transferred to the liquidator. * @param borrower The borrower of this cToken to be liquidated * @param cTokenCollateral The market in which to seize collateral from the borrower * @param repayAmount The amount of the underlying borrowed asset to repay * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount. */ function liquidateBorrowInternal(address borrower, uint repayAmount, CTokenInterface cTokenCollateral) internal nonReentrant(false) returns (uint, uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted liquidation failed return (fail(Error(error), FailureInfo.LIQUIDATE_ACCRUE_BORROW_INTEREST_FAILED), 0); } error = cTokenCollateral.accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but we still want to log the fact that an attempted liquidation failed return (fail(Error(error), FailureInfo.LIQUIDATE_ACCRUE_COLLATERAL_INTEREST_FAILED), 0); } // liquidateBorrowFresh emits borrow-specific logs on errors, so we don't need to return liquidateBorrowFresh(msg.sender, borrower, repayAmount, cTokenCollateral); } /** * @notice The liquidator liquidates the borrowers collateral. * The collateral seized is transferred to the liquidator. * @param borrower The borrower of this cToken to be liquidated * @param liquidator The address repaying the borrow and seizing collateral * @param cTokenCollateral The market in which to seize collateral from the borrower * @param repayAmount The amount of the underlying borrowed asset to repay * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount. */ function liquidateBorrowFresh(address liquidator, address borrower, uint repayAmount, CTokenInterface cTokenCollateral) internal returns (uint, uint) { /* Fail if liquidate not allowed */ uint allowed = comptroller.liquidateBorrowAllowed(address(this), address(cTokenCollateral), liquidator, borrower, repayAmount); if (allowed != 0) { return (failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.LIQUIDATE_COMPTROLLER_REJECTION, allowed), 0); } /* Verify market's block number equals current block number */ if (accrualBlockNumber != getBlockNumber()) { return (fail(Error.MARKET_NOT_FRESH, FailureInfo.LIQUIDATE_FRESHNESS_CHECK), 0); } /* Verify cTokenCollateral market's block number equals current block number */ if (cTokenCollateral.accrualBlockNumber() != getBlockNumber()) { return (fail(Error.MARKET_NOT_FRESH, FailureInfo.LIQUIDATE_COLLATERAL_FRESHNESS_CHECK), 0); } /* Fail if borrower = liquidator */ if (borrower == liquidator) { return (fail(Error.INVALID_ACCOUNT_PAIR, FailureInfo.LIQUIDATE_LIQUIDATOR_IS_BORROWER), 0); } /* Fail if repayAmount = 0 */ if (repayAmount == 0) { return (fail(Error.INVALID_CLOSE_AMOUNT_REQUESTED, FailureInfo.LIQUIDATE_CLOSE_AMOUNT_IS_ZERO), 0); } /* Fail if repayAmount = -1 */ if (repayAmount == uint(-1)) { return (fail(Error.INVALID_CLOSE_AMOUNT_REQUESTED, FailureInfo.LIQUIDATE_CLOSE_AMOUNT_IS_UINT_MAX), 0); } /* Fail if repayBorrow fails */ (uint repayBorrowError, uint actualRepayAmount) = repayBorrowFresh(liquidator, borrower, repayAmount); if (repayBorrowError != uint(Error.NO_ERROR)) { return (fail(Error(repayBorrowError), FailureInfo.LIQUIDATE_REPAY_BORROW_FRESH_FAILED), 0); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* We calculate the number of collateral tokens that will be seized */ (uint amountSeizeError, uint seizeTokens) = comptroller.liquidateCalculateSeizeTokens(address(this), address(cTokenCollateral), actualRepayAmount); require(amountSeizeError == uint(Error.NO_ERROR), "LIQUIDATE_COMPTROLLER_CALCULATE_AMOUNT_SEIZE_FAILED"); /* Revert if borrower collateral token balance < seizeTokens */ require(cTokenCollateral.balanceOf(borrower) >= seizeTokens, "LIQUIDATE_SEIZE_TOO_MUCH"); // If this is also the collateral, run seizeInternal to avoid re-entrancy, otherwise make an external call uint seizeError; if (address(cTokenCollateral) == address(this)) { seizeError = seizeInternal(address(this), liquidator, borrower, seizeTokens); } else { seizeError = cTokenCollateral.seize(liquidator, borrower, seizeTokens); } /* Revert if seize tokens fails (since we cannot be sure of side effects) */ require(seizeError == uint(Error.NO_ERROR), "token seizure failed"); /* We emit a LiquidateBorrow event */ emit LiquidateBorrow(liquidator, borrower, actualRepayAmount, address(cTokenCollateral), seizeTokens); /* We call the defense hook */ // unused function // comptroller.liquidateBorrowVerify(address(this), address(cTokenCollateral), liquidator, borrower, actualRepayAmount, seizeTokens); return (uint(Error.NO_ERROR), actualRepayAmount); } /** * @notice Transfers collateral tokens (this market) to the liquidator. * @dev Will fail unless called by another cToken during the process of liquidation. * Its absolutely critical to use msg.sender as the borrowed cToken and not a parameter. * @param liquidator The account receiving seized collateral * @param borrower The account having collateral seized * @param seizeTokens The number of cTokens to seize * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function seize(address liquidator, address borrower, uint seizeTokens) external nonReentrant(true) returns (uint) { return seizeInternal(msg.sender, liquidator, borrower, seizeTokens); } struct SeizeInternalLocalVars { MathError mathErr; uint borrowerTokensNew; uint liquidatorTokensNew; uint liquidatorSeizeTokens; uint protocolSeizeTokens; uint protocolSeizeAmount; uint exchangeRateMantissa; uint totalReservesNew; uint totalSupplyNew; } /** * @notice Transfers collateral tokens (this market) to the liquidator. * @dev Called only during an in-kind liquidation, or by liquidateBorrow during the liquidation of another CToken. * Its absolutely critical to use msg.sender as the seizer cToken and not a parameter. * @param seizerToken The contract seizing the collateral (i.e. borrowed cToken) * @param liquidator The account receiving seized collateral * @param borrower The account having collateral seized * @param seizeTokens The number of cTokens to seize * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function seizeInternal(address seizerToken, address liquidator, address borrower, uint seizeTokens) internal returns (uint) { /* Fail if seize not allowed */ uint allowed = comptroller.seizeAllowed(address(this), seizerToken, liquidator, borrower, seizeTokens); if (allowed != 0) { return failOpaque(Error.COMPTROLLER_REJECTION, FailureInfo.LIQUIDATE_SEIZE_COMPTROLLER_REJECTION, allowed); } /* Fail if borrower = liquidator */ if (borrower == liquidator) { return fail(Error.INVALID_ACCOUNT_PAIR, FailureInfo.LIQUIDATE_SEIZE_LIQUIDATOR_IS_BORROWER); } SeizeInternalLocalVars memory vars; /* * We calculate the new borrower and liquidator token balances, failing on underflow/overflow: * borrowerTokensNew = accountTokens[borrower] - seizeTokens * liquidatorTokensNew = accountTokens[liquidator] + seizeTokens */ (vars.mathErr, vars.borrowerTokensNew) = subUInt(accountTokens[borrower], seizeTokens); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.LIQUIDATE_SEIZE_BALANCE_DECREMENT_FAILED, uint(vars.mathErr)); } vars.protocolSeizeTokens = mul_(seizeTokens, Exp({mantissa: protocolSeizeShareMantissa})); vars.liquidatorSeizeTokens = sub_(seizeTokens, vars.protocolSeizeTokens); (vars.mathErr, vars.exchangeRateMantissa) = exchangeRateStoredInternal(); require(vars.mathErr == MathError.NO_ERROR, "exchange rate math error"); vars.protocolSeizeAmount = mul_ScalarTruncate(Exp({mantissa: vars.exchangeRateMantissa}), vars.protocolSeizeTokens); vars.totalReservesNew = add_(totalReserves, vars.protocolSeizeAmount); vars.totalSupplyNew = sub_(totalSupply, vars.protocolSeizeTokens); (vars.mathErr, vars.liquidatorTokensNew) = addUInt(accountTokens[liquidator], vars.liquidatorSeizeTokens); if (vars.mathErr != MathError.NO_ERROR) { return failOpaque(Error.MATH_ERROR, FailureInfo.LIQUIDATE_SEIZE_BALANCE_INCREMENT_FAILED, uint(vars.mathErr)); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) /* We write the previously calculated values into storage */ totalReserves = vars.totalReservesNew; totalSupply = vars.totalSupplyNew; accountTokens[borrower] = vars.borrowerTokensNew; accountTokens[liquidator] = vars.liquidatorTokensNew; /* Emit a Transfer event */ emit Transfer(borrower, liquidator, vars.liquidatorSeizeTokens); emit Transfer(borrower, address(this), vars.protocolSeizeTokens); emit ReservesAdded(address(this), vars.protocolSeizeAmount, vars.totalReservesNew); /* We call the defense hook */ // unused function // comptroller.seizeVerify(address(this), seizerToken, liquidator, borrower, seizeTokens); return uint(Error.NO_ERROR); } /*** Admin Functions ***/ /** * @notice Sets a new comptroller for the market * @dev Internal function to set a new comptroller * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setComptroller(ComptrollerInterface newComptroller) internal returns (uint) { ComptrollerInterface oldComptroller = comptroller; // Ensure invoke comptroller.isComptroller() returns true require(newComptroller.isComptroller(), "marker method returned false"); // Set market's comptroller to newComptroller comptroller = newComptroller; // Emit NewComptroller(oldComptroller, newComptroller) emit NewComptroller(oldComptroller, newComptroller); return uint(Error.NO_ERROR); } /** * @notice accrues interest and sets a new admin fee for the protocol using _setAdminFeeFresh * @dev Admin function to accrue interest and set a new admin fee * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setAdminFee(uint newAdminFeeMantissa) external nonReentrant(false) returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted admin fee change failed. return fail(Error(error), FailureInfo.SET_ADMIN_FEE_ACCRUE_INTEREST_FAILED); } // _setAdminFeeFresh emits reserve-factor-specific logs on errors, so we don't need to. return _setAdminFeeFresh(newAdminFeeMantissa); } /** * @notice Sets a new admin fee for the protocol (*requires fresh interest accrual) * @dev Admin function to set a new admin fee * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setAdminFeeFresh(uint newAdminFeeMantissa) internal returns (uint) { // Verify market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { return fail(Error.MARKET_NOT_FRESH, FailureInfo.SET_ADMIN_FEE_FRESH_CHECK); } // Sanitize newAdminFeeMantissa if (newAdminFeeMantissa == uint(-1)) newAdminFeeMantissa = adminFeeMantissa; // Get latest Fuse fee uint newFuseFeeMantissa = getPendingFuseFeeFromAdmin(); // Check reserveFactorMantissa + newAdminFeeMantissa + newFuseFeeMantissa ≤ reserveFactorPlusFeesMaxMantissa if (add_(add_(reserveFactorMantissa, newAdminFeeMantissa), newFuseFeeMantissa) > reserveFactorPlusFeesMaxMantissa) { return fail(Error.BAD_INPUT, FailureInfo.SET_ADMIN_FEE_BOUNDS_CHECK); } // If setting admin fee if (adminFeeMantissa != newAdminFeeMantissa) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_ADMIN_FEE_ADMIN_CHECK); } // Set admin fee uint oldAdminFeeMantissa = adminFeeMantissa; adminFeeMantissa = newAdminFeeMantissa; // Emit event emit NewAdminFee(oldAdminFeeMantissa, newAdminFeeMantissa); } // If setting Fuse fee if (fuseFeeMantissa != newFuseFeeMantissa) { // Set Fuse fee uint oldFuseFeeMantissa = fuseFeeMantissa; fuseFeeMantissa = newFuseFeeMantissa; // Emit event emit NewFuseFee(oldFuseFeeMantissa, newFuseFeeMantissa); } return uint(Error.NO_ERROR); } /** * @notice accrues interest and sets a new reserve factor for the protocol using _setReserveFactorFresh * @dev Admin function to accrue interest and set a new reserve factor * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setReserveFactor(uint newReserveFactorMantissa) external nonReentrant(false) returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reserve factor change failed. return fail(Error(error), FailureInfo.SET_RESERVE_FACTOR_ACCRUE_INTEREST_FAILED); } // _setReserveFactorFresh emits reserve-factor-specific logs on errors, so we don't need to. return _setReserveFactorFresh(newReserveFactorMantissa); } /** * @notice Sets a new reserve factor for the protocol (*requires fresh interest accrual) * @dev Admin function to set a new reserve factor * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setReserveFactorFresh(uint newReserveFactorMantissa) internal returns (uint) { // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_RESERVE_FACTOR_ADMIN_CHECK); } // Verify market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { return fail(Error.MARKET_NOT_FRESH, FailureInfo.SET_RESERVE_FACTOR_FRESH_CHECK); } // Check newReserveFactor ≤ maxReserveFactor if (add_(add_(newReserveFactorMantissa, adminFeeMantissa), fuseFeeMantissa) > reserveFactorPlusFeesMaxMantissa) { return fail(Error.BAD_INPUT, FailureInfo.SET_RESERVE_FACTOR_BOUNDS_CHECK); } uint oldReserveFactorMantissa = reserveFactorMantissa; reserveFactorMantissa = newReserveFactorMantissa; emit NewReserveFactor(oldReserveFactorMantissa, newReserveFactorMantissa); return uint(Error.NO_ERROR); } /** * @notice Accrues interest and reduces reserves by transferring to admin * @param reduceAmount Amount of reduction to reserves * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _reduceReserves(uint reduceAmount) external nonReentrant(false) returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reduce reserves failed. return fail(Error(error), FailureInfo.REDUCE_RESERVES_ACCRUE_INTEREST_FAILED); } // _reduceReservesFresh emits reserve-reduction-specific logs on errors, so we don't need to. return _reduceReservesFresh(reduceAmount); } /** * @notice Reduces reserves by transferring to admin * @dev Requires fresh interest accrual * @param reduceAmount Amount of reduction to reserves * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _reduceReservesFresh(uint reduceAmount) internal returns (uint) { // totalReserves - reduceAmount uint totalReservesNew; // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.REDUCE_RESERVES_ADMIN_CHECK); } // We fail gracefully unless market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { return fail(Error.MARKET_NOT_FRESH, FailureInfo.REDUCE_RESERVES_FRESH_CHECK); } // Fail gracefully if protocol has insufficient underlying cash if (getCashPrior() < reduceAmount) { return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.REDUCE_RESERVES_CASH_NOT_AVAILABLE); } // Check reduceAmount ≤ reserves[n] (totalReserves) if (reduceAmount > totalReserves) { return fail(Error.BAD_INPUT, FailureInfo.REDUCE_RESERVES_VALIDATION); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) // We checked reduceAmount <= totalReserves above, so this should never revert. totalReservesNew = sub_(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(msg.sender, reduceAmount); emit ReservesReduced(msg.sender, reduceAmount, totalReservesNew); return uint(Error.NO_ERROR); } /** * @notice Accrues interest and reduces Fuse fees by transferring to Fuse * @param withdrawAmount Amount of fees to withdraw * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _withdrawFuseFees(uint withdrawAmount) external nonReentrant(false) returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted Fuse fee withdrawal failed. return fail(Error(error), FailureInfo.WITHDRAW_FUSE_FEES_ACCRUE_INTEREST_FAILED); } // _withdrawFuseFeesFresh emits reserve-reduction-specific logs on errors, so we don't need to. return _withdrawFuseFeesFresh(withdrawAmount); } /** * @notice Reduces Fuse fees by transferring to Fuse * @dev Requires fresh interest accrual * @param withdrawAmount Amount of fees to withdraw * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _withdrawFuseFeesFresh(uint withdrawAmount) internal returns (uint) { // totalFuseFees - reduceAmount uint totalFuseFeesNew; // We fail gracefully unless market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { return fail(Error.MARKET_NOT_FRESH, FailureInfo.WITHDRAW_FUSE_FEES_FRESH_CHECK); } // Fail gracefully if protocol has insufficient underlying cash if (getCashPrior() < withdrawAmount) { return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.WITHDRAW_FUSE_FEES_CASH_NOT_AVAILABLE); } // Check withdrawAmount ≤ fuseFees[n] (totalFuseFees) if (withdrawAmount > totalFuseFees) { return fail(Error.BAD_INPUT, FailureInfo.WITHDRAW_FUSE_FEES_VALIDATION); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) // We checked withdrawAmount <= totalFuseFees above, so this should never revert. totalFuseFeesNew = sub_(totalFuseFees, withdrawAmount); // Store fuseFees[n+1] = fuseFees[n] - withdrawAmount totalFuseFees = totalFuseFeesNew; // doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred. doTransferOut(address(fuseAdmin), withdrawAmount); return uint(Error.NO_ERROR); } /** * @notice Accrues interest and reduces admin fees by transferring to admin * @param withdrawAmount Amount of fees to withdraw * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _withdrawAdminFees(uint withdrawAmount) external nonReentrant(false) returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted admin fee withdrawal failed. return fail(Error(error), FailureInfo.WITHDRAW_ADMIN_FEES_ACCRUE_INTEREST_FAILED); } // _withdrawAdminFeesFresh emits reserve-reduction-specific logs on errors, so we don't need to. return _withdrawAdminFeesFresh(withdrawAmount); } /** * @notice Reduces admin fees by transferring to admin * @dev Requires fresh interest accrual * @param withdrawAmount Amount of fees to withdraw * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _withdrawAdminFeesFresh(uint withdrawAmount) internal returns (uint) { // totalAdminFees - reduceAmount uint totalAdminFeesNew; // We fail gracefully unless market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { return fail(Error.MARKET_NOT_FRESH, FailureInfo.WITHDRAW_ADMIN_FEES_FRESH_CHECK); } // Fail gracefully if protocol has insufficient underlying cash if (getCashPrior() < withdrawAmount) { return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.WITHDRAW_ADMIN_FEES_CASH_NOT_AVAILABLE); } // Check withdrawAmount ≤ adminFees[n] (totalAdminFees) if (withdrawAmount > totalAdminFees) { return fail(Error.BAD_INPUT, FailureInfo.WITHDRAW_ADMIN_FEES_VALIDATION); } ///////////////////////// // EFFECTS & INTERACTIONS // (No safe failures beyond this point) // We checked withdrawAmount <= totalAdminFees above, so this should never revert. totalAdminFeesNew = sub_(totalAdminFees, withdrawAmount); // Store adminFees[n+1] = adminFees[n] - withdrawAmount totalAdminFees = totalAdminFeesNew; // doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred. doTransferOut(address(uint160(UnitrollerAdminStorage(address(comptroller)).admin())), withdrawAmount); return uint(Error.NO_ERROR); } /** * @notice accrues interest and updates the interest rate model using _setInterestRateModelFresh * @dev Admin function to accrue interest and update the interest rate model * @param newInterestRateModel the new interest rate model to use * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setInterestRateModel(InterestRateModel newInterestRateModel) public returns (uint) { uint error = accrueInterest(); if (error != uint(Error.NO_ERROR)) { // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted change of interest rate model failed return fail(Error(error), FailureInfo.SET_INTEREST_RATE_MODEL_ACCRUE_INTEREST_FAILED); } // _setInterestRateModelFresh emits interest-rate-model-update-specific logs on errors, so we don't need to. return _setInterestRateModelFresh(newInterestRateModel); } /** * @notice updates the interest rate model (*requires fresh interest accrual) * @dev Admin function to update the interest rate model * @param newInterestRateModel the new interest rate model to use * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setInterestRateModelFresh(InterestRateModel newInterestRateModel) internal returns (uint) { // Used to store old model for use in the event that is emitted on success InterestRateModel oldInterestRateModel; // Check caller is admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_INTEREST_RATE_MODEL_OWNER_CHECK); } // We fail gracefully unless market's block number equals current block number if (accrualBlockNumber != getBlockNumber()) { return fail(Error.MARKET_NOT_FRESH, FailureInfo.SET_INTEREST_RATE_MODEL_FRESH_CHECK); } // Track the market's current interest rate model oldInterestRateModel = interestRateModel; // Ensure invoke newInterestRateModel.isInterestRateModel() returns true require(newInterestRateModel.isInterestRateModel(), "marker method returned false"); // Set the interest rate model to newInterestRateModel interestRateModel = newInterestRateModel; // Emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel) emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel); // Attempt to reset interest checkpoints on old IRM if (address(oldInterestRateModel) != address(0)) address(oldInterestRateModel).call(abi.encodeWithSignature("resetInterestCheckpoints()")); // Attempt to add first interest checkpoint on new IRM address(newInterestRateModel).call(abi.encodeWithSignature("checkpointInterest()")); return uint(Error.NO_ERROR); } /** * @notice updates the cToken ERC20 name and symbol * @dev Admin function to update the cToken ERC20 name and symbol * @param _name the new ERC20 token name to use * @param _symbol the new ERC20 token symbol to use * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setNameAndSymbol(string calldata _name, string calldata _symbol) external { // Check caller is admin require(hasAdminRights(), "caller not admin"); // Set ERC20 name and symbol name = _name; symbol = _symbol; } /*** Safe Token ***/ /** * @notice Gets balance of this contract in terms of the underlying * @dev This excludes the value of the current message, if any * @return The quantity of underlying owned by this contract */ function getCashPrior() internal view returns (uint); /** * @dev Performs a transfer in, reverting upon failure. Returns the amount actually transferred to the protocol, in case of a fee. * This may revert due to insufficient balance or insufficient allowance. */ function doTransferIn(address from, uint amount) internal returns (uint); /** * @dev Performs a transfer out, ideally returning an explanatory error code upon failure tather than reverting. * If caller has not called checked protocol's balance, may revert due to insufficient cash held in the contract. * If caller has checked protocol's balance, and verified it is >= amount, this should not revert in normal conditions. */ function doTransferOut(address payable to, uint amount) internal; /*** Reentrancy Guard ***/ /** * @dev Prevents a contract from calling itself, directly or indirectly. */ modifier nonReentrant(bool localOnly) { _beforeNonReentrant(localOnly); _; _afterNonReentrant(localOnly); } /** * @dev Split off from `nonReentrant` to keep contract below the 24 KB size limit. * Saves space because function modifier code is "inlined" into every function with the modifier). * In this specific case, the optimization saves around 1500 bytes of that valuable 24 KB limit. */ function _beforeNonReentrant(bool localOnly) private { require(_notEntered, "re-entered"); if (!localOnly) comptroller._beforeNonReentrant(); _notEntered = false; } /** * @dev Split off from `nonReentrant` to keep contract below the 24 KB size limit. * Saves space because function modifier code is "inlined" into every function with the modifier). * In this specific case, the optimization saves around 150 bytes of that valuable 24 KB limit. */ function _afterNonReentrant(bool localOnly) private { _notEntered = true; // get a gas-refund post-Istanbul if (!localOnly) comptroller._afterNonReentrant(); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * @param data The call data (encoded using abi.encode or one of its variants). * @param errorMessage The revert string to return on failure. */ function _functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.call(data); if (!success) { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } return returndata; } }
pragma solidity ^0.5.16; import "./IFuseFeeDistributor.sol"; import "./ComptrollerStorage.sol"; import "./ComptrollerInterface.sol"; import "./InterestRateModel.sol"; contract CTokenAdminStorage { /** * @notice Administrator for Fuse */ IFuseFeeDistributor internal constant fuseAdmin = IFuseFeeDistributor(0xa731585ab05fC9f83555cf9Bff8F58ee94e18F85); /** * @dev LEGACY USE ONLY: Administrator for this contract */ address payable internal __admin; /** * @dev LEGACY USE ONLY: Whether or not the Fuse admin has admin rights */ bool internal __fuseAdminHasRights; /** * @dev LEGACY USE ONLY: Whether or not the admin has admin rights */ bool internal __adminHasRights; } contract CTokenStorage is CTokenAdminStorage { /** * @dev Guard variable for re-entrancy checks */ bool internal _notEntered; /** * @notice EIP-20 token name for this token */ string public name; /** * @notice EIP-20 token symbol for this token */ string public symbol; /** * @notice EIP-20 token decimals for this token */ uint8 public decimals; /** * @notice Maximum borrow rate that can ever be applied (.0005% / block) */ uint internal constant borrowRateMaxMantissa = 0.0005e16; /** * @notice Maximum fraction of interest that can be set aside for reserves + fees */ uint internal constant reserveFactorPlusFeesMaxMantissa = 1e18; /** * @notice LEGACY USE ONLY: Pending administrator for this contract */ address payable private __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; /** * @notice Initial exchange rate used when minting the first CTokens (used when totalSupply = 0) */ uint internal initialExchangeRateMantissa; /** * @notice Fraction of interest currently set aside for admin fees */ uint public adminFeeMantissa; /** * @notice Fraction of interest currently set aside for Fuse fees */ uint public fuseFeeMantissa; /** * @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 amount of admin fees of the underlying held in this market */ uint public totalAdminFees; /** * @notice Total amount of Fuse fees of the underlying held in this market */ uint public totalFuseFees; /** * @notice Total number of tokens in circulation */ uint public totalSupply; /** * @notice Official record of token balances for each account */ mapping (address => uint) internal accountTokens; /** * @notice Approved token transfer amounts on behalf of others */ mapping (address => mapping (address => uint)) internal transferAllowances; /** * @notice Container for borrow balance information * @member principal Total balance (with accrued interest), after applying the most recent balance-changing action * @member interestIndex Global borrowIndex as of the most recent balance-changing action */ struct BorrowSnapshot { uint principal; uint interestIndex; } /** * @notice Mapping of account addresses to outstanding borrow balances */ mapping(address => BorrowSnapshot) internal accountBorrows; /** * @notice Share of seized collateral that is added to reserves */ uint public constant protocolSeizeShareMantissa = 2.8e16; //2.8% } contract CTokenInterface is CTokenStorage { /** * @notice Indicator that this is a CToken contract (for inspection) */ bool public constant isCToken = true; /** * @notice Indicator that this is or is not a CEther contract (for inspection) */ bool public constant isCEther = false; /*** Market Events ***/ /** * @notice Event emitted when interest is accrued */ event AccrueInterest(uint cashPrior, uint interestAccumulated, uint borrowIndex, uint totalBorrows); /** * @notice Event emitted when tokens are minted */ event Mint(address minter, uint mintAmount, uint mintTokens); /** * @notice Event emitted when tokens are redeemed */ event Redeem(address redeemer, uint redeemAmount, uint redeemTokens); /** * @notice Event emitted when underlying is borrowed */ event Borrow(address borrower, uint borrowAmount, uint accountBorrows, uint totalBorrows); /** * @notice Event emitted when a borrow is repaid */ event RepayBorrow(address payer, address borrower, uint repayAmount, uint accountBorrows, uint totalBorrows); /** * @notice Event emitted when a borrow is liquidated */ event LiquidateBorrow(address liquidator, address borrower, uint repayAmount, address cTokenCollateral, uint seizeTokens); /*** Admin Events ***/ /** * @notice Event emitted when comptroller is changed */ event NewComptroller(ComptrollerInterface oldComptroller, ComptrollerInterface newComptroller); /** * @notice Event emitted when interestRateModel is changed */ event NewMarketInterestRateModel(InterestRateModel oldInterestRateModel, InterestRateModel newInterestRateModel); /** * @notice Event emitted when the reserve factor is changed */ event NewReserveFactor(uint oldReserveFactorMantissa, uint newReserveFactorMantissa); /** * @notice Event emitted when the 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 Event emitted when the admin fee is changed */ event NewAdminFee(uint oldAdminFeeMantissa, uint newAdminFeeMantissa); /** * @notice Event emitted when the Fuse fee is changed */ event NewFuseFee(uint oldFuseFeeMantissa, uint newFuseFeeMantissa); /** * @notice EIP20 Transfer event */ event Transfer(address indexed from, address indexed to, uint amount); /** * @notice EIP20 Approval event */ event Approval(address indexed owner, address indexed spender, uint amount); /** * @notice Failure event */ event Failure(uint error, uint info, uint detail); /*** User Interface ***/ function transfer(address dst, uint amount) external returns (bool); function transferFrom(address src, address dst, uint amount) external returns (bool); function approve(address spender, uint amount) external returns (bool); function allowance(address owner, address spender) external view returns (uint); function balanceOf(address owner) external view returns (uint); function balanceOfUnderlying(address owner) external returns (uint); function getAccountSnapshot(address account) external view returns (uint, uint, uint, uint); function borrowRatePerBlock() external view returns (uint); function supplyRatePerBlock() external view returns (uint); function totalBorrowsCurrent() external returns (uint); function borrowBalanceCurrent(address account) external returns (uint); function borrowBalanceStored(address account) public view returns (uint); function exchangeRateCurrent() public returns (uint); function exchangeRateStored() public view returns (uint); function getCash() external view returns (uint); function accrueInterest() public returns (uint); function seize(address liquidator, address borrower, uint seizeTokens) external returns (uint); /*** Admin Functions ***/ function _setReserveFactor(uint newReserveFactorMantissa) external returns (uint); function _reduceReserves(uint reduceAmount) external returns (uint); function _setInterestRateModel(InterestRateModel newInterestRateModel) public returns (uint); } contract CErc20Storage { /** * @notice Underlying asset for this CToken */ address public underlying; } contract CErc20Interface is CErc20Storage { /*** User Interface ***/ function mint(uint mintAmount) external returns (uint); function redeem(uint redeemTokens) external returns (uint); function redeemUnderlying(uint redeemAmount) external returns (uint); function borrow(uint borrowAmount) external returns (uint); function repayBorrow(uint repayAmount) external returns (uint); function repayBorrowBehalf(address borrower, uint repayAmount) external returns (uint); function liquidateBorrow(address borrower, uint repayAmount, CTokenInterface cTokenCollateral) external returns (uint); } contract CEtherInterface is CErc20Storage { /** * @notice Indicator that this is a CEther contract (for inspection) */ bool public constant isCEther = true; } contract CDelegationStorage { /** * @notice Implementation address for this contract */ address public implementation; } contract CDelegateInterface is CDelegationStorage { /** * @notice Emitted when implementation is changed */ event NewImplementation(address oldImplementation, address newImplementation); /** * @notice Called by the admin to update the implementation of the delegator * @param implementation_ The address of the new implementation for delegation * @param allowResign Flag to indicate whether to call _resignImplementation on the old implementation * @param becomeImplementationData The encoded bytes data to be passed to _becomeImplementation */ function _setImplementationSafe(address implementation_, bool allowResign, bytes calldata becomeImplementationData) external; /** * @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 calldata data) external; /** * @notice Function called before all delegator functions * @dev Checks comptroller.autoImplementation and upgrades the implementation if necessary */ function _prepare() external payable; }
pragma solidity ^0.5.16; /** * @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 The balance */ function balanceOf(address owner) external view returns (uint256 balance); /** * @notice Transfer `amount` tokens from `msg.sender` to `dst` * @param dst The address of the destination account * @param amount The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transfer(address dst, uint256 amount) external returns (bool success); /** * @notice Transfer `amount` tokens from `src` to `dst` * @param src The address of the source account * @param dst The address of the destination account * @param amount The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transferFrom(address src, address dst, uint256 amount) external returns (bool success); /** * @notice Approve `spender` to transfer up to `amount` from `src` * @dev This will overwrite the approval amount for `spender` * and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve) * @param spender The address of the account which may transfer tokens * @param amount The number of tokens that are approved (-1 means infinite) * @return Whether or not the approval succeeded */ function approve(address spender, uint256 amount) external returns (bool success); /** * @notice Get the current allowance from `owner` for `spender` * @param owner The address of the account which owns the tokens to be spent * @param spender The address of the account which may transfer tokens * @return The number of tokens allowed to be spent (-1 means infinite) */ function allowance(address owner, address spender) external view returns (uint256 remaining); event Transfer(address indexed from, address indexed to, uint256 amount); event Approval(address indexed owner, address indexed spender, uint256 amount); }
pragma solidity ^0.5.16; /** * @title EIP20NonStandardInterface * @dev Version of ERC20 with no return values for `transfer` and `transferFrom` * See https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca */ interface EIP20NonStandardInterface { /** * @notice Get the total number of tokens in circulation * @return The supply of tokens */ function totalSupply() external view returns (uint256); /** * @notice Gets the balance of the specified address * @param owner The address from which the balance will be retrieved * @return The balance */ function balanceOf(address owner) external view returns (uint256 balance); /// /// !!!!!!!!!!!!!! /// !!! NOTICE !!! `transfer` does not return a value, in violation of the ERC-20 specification /// !!!!!!!!!!!!!! /// /** * @notice Transfer `amount` tokens from `msg.sender` to `dst` * @param dst The address of the destination account * @param amount The number of tokens to transfer */ function transfer(address dst, uint256 amount) external; /// /// !!!!!!!!!!!!!! /// !!! NOTICE !!! `transferFrom` does not return a value, in violation of the ERC-20 specification /// !!!!!!!!!!!!!! /// /** * @notice Transfer `amount` tokens from `src` to `dst` * @param src The address of the source account * @param dst The address of the destination account * @param amount The number of tokens to transfer */ function transferFrom(address src, address dst, uint256 amount) external; /** * @notice Approve `spender` to transfer up to `amount` from `src` * @dev This will overwrite the approval amount for `spender` * and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve) * @param spender The address of the account which may transfer tokens * @param amount The number of tokens that are approved * @return Whether or not the approval succeeded */ function approve(address spender, uint256 amount) external returns (bool success); /** * @notice Get the current allowance from `owner` for `spender` * @param owner The address of the account which owns the tokens to be spent * @param spender The address of the account which may transfer tokens * @return The number of tokens allowed to be spent */ function allowance(address owner, address spender) external view returns (uint256 remaining); event Transfer(address indexed from, address indexed to, uint256 amount); event Approval(address indexed owner, address indexed spender, uint256 amount); }
pragma solidity ^0.5.16; 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, SUPPLIER_NOT_WHITELISTED, BORROW_BELOW_MIN, SUPPLY_ABOVE_MAX, NONZERO_TOTAL_SUPPLY } enum FailureInfo { ACCEPT_ADMIN_PENDING_ADMIN_CHECK, ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK, ADD_REWARDS_DISTRIBUTOR_OWNER_CHECK, EXIT_MARKET_BALANCE_OWED, EXIT_MARKET_REJECTION, TOGGLE_ADMIN_RIGHTS_OWNER_CHECK, TOGGLE_AUTO_IMPLEMENTATIONS_ENABLED_OWNER_CHECK, 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_LIQUIDATION_INCENTIVE_OWNER_CHECK, SET_LIQUIDATION_INCENTIVE_VALIDATION, SET_MAX_ASSETS_OWNER_CHECK, SET_PENDING_ADMIN_OWNER_CHECK, SET_PENDING_IMPLEMENTATION_CONTRACT_CHECK, SET_PENDING_IMPLEMENTATION_OWNER_CHECK, SET_PRICE_ORACLE_OWNER_CHECK, SET_WHITELIST_ENFORCEMENT_OWNER_CHECK, SET_WHITELIST_STATUS_OWNER_CHECK, SUPPORT_MARKET_EXISTS, SUPPORT_MARKET_OWNER_CHECK, SET_PAUSE_GUARDIAN_OWNER_CHECK, UNSUPPORT_MARKET_OWNER_CHECK, UNSUPPORT_MARKET_DOES_NOT_EXIST, UNSUPPORT_MARKET_IN_USE } /** * @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary * contract-specific code that enables us to report opaque error codes from upgradeable contracts. **/ event Failure(uint error, uint info, uint detail); /** * @dev use this when reporting a known error from the money market or a non-upgradeable collaborator */ function fail(Error err, FailureInfo info) internal returns (uint) { emit Failure(uint(err), uint(info), 0); return uint(err); } /** * @dev use this when reporting an opaque error from an upgradeable collaborator contract */ function failOpaque(Error err, FailureInfo info, uint opaqueError) internal returns (uint) { emit Failure(uint(err), uint(info), opaqueError); return uint(err); } } contract TokenErrorReporter { enum Error { NO_ERROR, UNAUTHORIZED, BAD_INPUT, COMPTROLLER_REJECTION, COMPTROLLER_CALCULATION_ERROR, INTEREST_RATE_MODEL_ERROR, INVALID_ACCOUNT_PAIR, INVALID_CLOSE_AMOUNT_REQUESTED, INVALID_COLLATERAL_FACTOR, MATH_ERROR, MARKET_NOT_FRESH, MARKET_NOT_LISTED, TOKEN_INSUFFICIENT_ALLOWANCE, TOKEN_INSUFFICIENT_BALANCE, TOKEN_INSUFFICIENT_CASH, TOKEN_TRANSFER_IN_FAILED, TOKEN_TRANSFER_OUT_FAILED, UTILIZATION_ABOVE_MAX } /* * Note: FailureInfo (but not Error) is kept in alphabetical order * This is because FailureInfo grows significantly faster, and * the order of Error has some meaning, while the order of FailureInfo * is entirely arbitrary. */ enum FailureInfo { ACCEPT_ADMIN_PENDING_ADMIN_CHECK, ACCRUE_INTEREST_ACCUMULATED_INTEREST_CALCULATION_FAILED, ACCRUE_INTEREST_BORROW_RATE_CALCULATION_FAILED, ACCRUE_INTEREST_NEW_BORROW_INDEX_CALCULATION_FAILED, ACCRUE_INTEREST_NEW_TOTAL_BORROWS_CALCULATION_FAILED, ACCRUE_INTEREST_NEW_TOTAL_RESERVES_CALCULATION_FAILED, ACCRUE_INTEREST_NEW_TOTAL_FUSE_FEES_CALCULATION_FAILED, ACCRUE_INTEREST_NEW_TOTAL_ADMIN_FEES_CALCULATION_FAILED, ACCRUE_INTEREST_SIMPLE_INTEREST_FACTOR_CALCULATION_FAILED, BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED, BORROW_ACCRUE_INTEREST_FAILED, BORROW_CASH_NOT_AVAILABLE, BORROW_FRESHNESS_CHECK, BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED, BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED, BORROW_MARKET_NOT_LISTED, BORROW_COMPTROLLER_REJECTION, LIQUIDATE_ACCRUE_BORROW_INTEREST_FAILED, LIQUIDATE_ACCRUE_COLLATERAL_INTEREST_FAILED, LIQUIDATE_COLLATERAL_FRESHNESS_CHECK, LIQUIDATE_COMPTROLLER_REJECTION, LIQUIDATE_COMPTROLLER_CALCULATE_AMOUNT_SEIZE_FAILED, LIQUIDATE_CLOSE_AMOUNT_IS_UINT_MAX, LIQUIDATE_CLOSE_AMOUNT_IS_ZERO, LIQUIDATE_FRESHNESS_CHECK, LIQUIDATE_LIQUIDATOR_IS_BORROWER, LIQUIDATE_REPAY_BORROW_FRESH_FAILED, LIQUIDATE_SEIZE_BALANCE_INCREMENT_FAILED, LIQUIDATE_SEIZE_BALANCE_DECREMENT_FAILED, LIQUIDATE_SEIZE_COMPTROLLER_REJECTION, LIQUIDATE_SEIZE_LIQUIDATOR_IS_BORROWER, LIQUIDATE_SEIZE_TOO_MUCH, MINT_ACCRUE_INTEREST_FAILED, MINT_COMPTROLLER_REJECTION, MINT_EXCHANGE_CALCULATION_FAILED, MINT_EXCHANGE_RATE_READ_FAILED, MINT_FRESHNESS_CHECK, MINT_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED, MINT_NEW_TOTAL_SUPPLY_CALCULATION_FAILED, MINT_TRANSFER_IN_FAILED, MINT_TRANSFER_IN_NOT_POSSIBLE, NEW_UTILIZATION_RATE_ABOVE_MAX, REDEEM_ACCRUE_INTEREST_FAILED, REDEEM_COMPTROLLER_REJECTION, REDEEM_EXCHANGE_TOKENS_CALCULATION_FAILED, REDEEM_EXCHANGE_AMOUNT_CALCULATION_FAILED, REDEEM_EXCHANGE_RATE_READ_FAILED, REDEEM_FRESHNESS_CHECK, REDEEM_NEW_ACCOUNT_BALANCE_CALCULATION_FAILED, REDEEM_NEW_TOTAL_SUPPLY_CALCULATION_FAILED, REDEEM_TRANSFER_OUT_NOT_POSSIBLE, WITHDRAW_FUSE_FEES_ACCRUE_INTEREST_FAILED, WITHDRAW_FUSE_FEES_CASH_NOT_AVAILABLE, WITHDRAW_FUSE_FEES_FRESH_CHECK, WITHDRAW_FUSE_FEES_VALIDATION, WITHDRAW_ADMIN_FEES_ACCRUE_INTEREST_FAILED, WITHDRAW_ADMIN_FEES_CASH_NOT_AVAILABLE, WITHDRAW_ADMIN_FEES_FRESH_CHECK, WITHDRAW_ADMIN_FEES_VALIDATION, REDUCE_RESERVES_ACCRUE_INTEREST_FAILED, REDUCE_RESERVES_ADMIN_CHECK, REDUCE_RESERVES_CASH_NOT_AVAILABLE, REDUCE_RESERVES_FRESH_CHECK, REDUCE_RESERVES_VALIDATION, REPAY_BEHALF_ACCRUE_INTEREST_FAILED, REPAY_BORROW_ACCRUE_INTEREST_FAILED, REPAY_BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED, REPAY_BORROW_COMPTROLLER_REJECTION, REPAY_BORROW_FRESHNESS_CHECK, REPAY_BORROW_NEW_ACCOUNT_BORROW_BALANCE_CALCULATION_FAILED, REPAY_BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED, REPAY_BORROW_TRANSFER_IN_NOT_POSSIBLE, SET_COLLATERAL_FACTOR_OWNER_CHECK, SET_COLLATERAL_FACTOR_VALIDATION, SET_COMPTROLLER_OWNER_CHECK, SET_INTEREST_RATE_MODEL_ACCRUE_INTEREST_FAILED, SET_INTEREST_RATE_MODEL_FRESH_CHECK, SET_INTEREST_RATE_MODEL_OWNER_CHECK, SET_MAX_ASSETS_OWNER_CHECK, SET_ORACLE_MARKET_NOT_LISTED, TOGGLE_ADMIN_RIGHTS_OWNER_CHECK, SET_PENDING_ADMIN_OWNER_CHECK, SET_ADMIN_FEE_ACCRUE_INTEREST_FAILED, SET_ADMIN_FEE_ADMIN_CHECK, SET_ADMIN_FEE_FRESH_CHECK, SET_ADMIN_FEE_BOUNDS_CHECK, SET_FUSE_FEE_ACCRUE_INTEREST_FAILED, SET_FUSE_FEE_FRESH_CHECK, SET_FUSE_FEE_BOUNDS_CHECK, SET_RESERVE_FACTOR_ACCRUE_INTEREST_FAILED, SET_RESERVE_FACTOR_ADMIN_CHECK, SET_RESERVE_FACTOR_FRESH_CHECK, SET_RESERVE_FACTOR_BOUNDS_CHECK, TRANSFER_COMPTROLLER_REJECTION, TRANSFER_NOT_ALLOWED, TRANSFER_NOT_ENOUGH, TRANSFER_TOO_MUCH, ADD_RESERVES_ACCRUE_INTEREST_FAILED, ADD_RESERVES_FRESH_CHECK, ADD_RESERVES_TRANSFER_IN_NOT_POSSIBLE } /** * @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary * contract-specific code that enables us to report opaque error codes from upgradeable contracts. **/ event Failure(uint error, uint info, uint detail); /** * @dev use this when reporting a known error from the money market or a non-upgradeable collaborator */ function fail(Error err, FailureInfo info) internal returns (uint) { emit Failure(uint(err), uint(info), 0); return uint(err); } /** * @dev use this when reporting an opaque error from an upgradeable collaborator contract */ function failOpaque(Error err, FailureInfo info, uint opaqueError) internal returns (uint) { emit Failure(uint(err), uint(info), opaqueError); return err == Error.COMPTROLLER_REJECTION ? 1000 + opaqueError : uint(err); } }
pragma solidity ^0.5.16; import "./CarefulMath.sol"; import "./ExponentialNoError.sol"; /** * @title Exponential module for storing fixed-precision decimals * @author Compound * @dev Legacy contract for compatibility reasons with existing contracts that still use MathError * @notice Exp is a struct which stores decimals with a fixed precision of 18 decimal places. * Thus, if we wanted to store the 5.1, mantissa would store 5.1e18. That is: * `Exp({mantissa: 5100000000000000000})`. */ contract Exponential is CarefulMath, ExponentialNoError { /** * @dev Creates an exponential from numerator and denominator values. * Note: Returns an error if (`num` * 10e18) > MAX_INT, * or if `denom` is zero. */ function getExp(uint num, uint denom) pure internal returns (MathError, Exp memory) { (MathError err0, uint scaledNumerator) = mulUInt(num, expScale); if (err0 != MathError.NO_ERROR) { return (err0, Exp({mantissa: 0})); } (MathError err1, uint rational) = divUInt(scaledNumerator, denom); if (err1 != MathError.NO_ERROR) { return (err1, Exp({mantissa: 0})); } return (MathError.NO_ERROR, Exp({mantissa: rational})); } /** * @dev Adds two exponentials, returning a new exponential. */ function addExp(Exp memory a, Exp memory b) pure internal returns (MathError, Exp memory) { (MathError error, uint result) = addUInt(a.mantissa, b.mantissa); return (error, Exp({mantissa: result})); } /** * @dev Subtracts two exponentials, returning a new exponential. */ function subExp(Exp memory a, Exp memory b) pure internal returns (MathError, Exp memory) { (MathError error, uint result) = subUInt(a.mantissa, b.mantissa); return (error, Exp({mantissa: result})); } /** * @dev Multiply an Exp by a scalar, returning a new Exp. */ function mulScalar(Exp memory a, uint scalar) pure internal returns (MathError, Exp memory) { (MathError err0, uint scaledMantissa) = mulUInt(a.mantissa, scalar); if (err0 != MathError.NO_ERROR) { return (err0, Exp({mantissa: 0})); } return (MathError.NO_ERROR, Exp({mantissa: scaledMantissa})); } /** * @dev Multiply an Exp by a scalar, then truncate to return an unsigned integer. */ function mulScalarTruncate(Exp memory a, uint scalar) pure internal returns (MathError, uint) { (MathError err, Exp memory product) = mulScalar(a, scalar); if (err != MathError.NO_ERROR) { return (err, 0); } return (MathError.NO_ERROR, truncate(product)); } /** * @dev Multiply an Exp by a scalar, truncate, then add an to an unsigned integer, returning an unsigned integer. */ function mulScalarTruncateAddUInt(Exp memory a, uint scalar, uint addend) pure internal returns (MathError, uint) { (MathError err, Exp memory product) = mulScalar(a, scalar); if (err != MathError.NO_ERROR) { return (err, 0); } return addUInt(truncate(product), addend); } /** * @dev Divide an Exp by a scalar, returning a new Exp. */ function divScalar(Exp memory a, uint scalar) pure internal returns (MathError, Exp memory) { (MathError err0, uint descaledMantissa) = divUInt(a.mantissa, scalar); if (err0 != MathError.NO_ERROR) { return (err0, Exp({mantissa: 0})); } return (MathError.NO_ERROR, Exp({mantissa: descaledMantissa})); } /** * @dev Divide a scalar by an Exp, returning a new Exp. */ function divScalarByExp(uint scalar, Exp memory divisor) pure internal returns (MathError, Exp memory) { /* We are doing this as: getExp(mulUInt(expScale, scalar), divisor.mantissa) How it works: Exp = a / b; Scalar = s; `s / (a / b)` = `b * s / a` and since for an Exp `a = mantissa, b = expScale` */ (MathError err0, uint numerator) = mulUInt(expScale, scalar); if (err0 != MathError.NO_ERROR) { return (err0, Exp({mantissa: 0})); } return getExp(numerator, divisor.mantissa); } /** * @dev Divide a scalar by an Exp, then truncate to return an unsigned integer. */ function divScalarByExpTruncate(uint scalar, Exp memory divisor) pure internal returns (MathError, uint) { (MathError err, Exp memory fraction) = divScalarByExp(scalar, divisor); if (err != MathError.NO_ERROR) { return (err, 0); } return (MathError.NO_ERROR, truncate(fraction)); } /** * @dev Multiplies two exponentials, returning a new exponential. */ function mulExp(Exp memory a, Exp memory b) pure internal returns (MathError, Exp memory) { (MathError err0, uint doubleScaledProduct) = mulUInt(a.mantissa, b.mantissa); if (err0 != MathError.NO_ERROR) { return (err0, Exp({mantissa: 0})); } // We add half the scale before dividing so that we get rounding instead of truncation. // See "Listing 6" and text above it at https://accu.org/index.php/journals/1717 // Without this change, a result like 6.6...e-19 will be truncated to 0 instead of being rounded to 1e-18. (MathError err1, uint doubleScaledProductWithHalfScale) = addUInt(halfExpScale, doubleScaledProduct); if (err1 != MathError.NO_ERROR) { return (err1, Exp({mantissa: 0})); } (MathError err2, uint product) = divUInt(doubleScaledProductWithHalfScale, expScale); // The only error `div` can return is MathError.DIVISION_BY_ZERO but we control `expScale` and it is not zero. assert(err2 == MathError.NO_ERROR); return (MathError.NO_ERROR, Exp({mantissa: product})); } /** * @dev Multiplies two exponentials given their mantissas, returning a new exponential. */ function mulExp(uint a, uint b) pure internal returns (MathError, Exp memory) { return mulExp(Exp({mantissa: a}), Exp({mantissa: b})); } /** * @dev Multiplies three exponentials, returning a new exponential. */ function mulExp3(Exp memory a, Exp memory b, Exp memory c) pure internal returns (MathError, Exp memory) { (MathError err, Exp memory ab) = mulExp(a, b); if (err != MathError.NO_ERROR) { return (err, ab); } return mulExp(ab, c); } /** * @dev Divides two exponentials, returning a new exponential. * (a/scale) / (b/scale) = (a/scale) * (scale/b) = a/b, * which we can scale as an Exp by calling getExp(a.mantissa, b.mantissa) */ function divExp(Exp memory a, Exp memory b) pure internal returns (MathError, Exp memory) { return getExp(a.mantissa, b.mantissa); } }
pragma solidity ^0.5.16; /** * @title Exponential module for storing fixed-precision decimals * @author Compound * @notice Exp is a struct which stores decimals with a fixed precision of 18 decimal places. * Thus, if we wanted to store the 5.1, mantissa would store 5.1e18. That is: * `Exp({mantissa: 5100000000000000000})`. */ contract 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 add_(a, b, "addition overflow"); } function add_(uint a, uint b, string memory errorMessage) pure internal returns (uint) { uint c = a + b; require(c >= a, errorMessage); return c; } function sub_(Exp memory a, Exp memory b) pure internal returns (Exp memory) { return Exp({mantissa: sub_(a.mantissa, b.mantissa)}); } function sub_(Double memory a, Double memory b) pure internal returns (Double memory) { return Double({mantissa: sub_(a.mantissa, b.mantissa)}); } function sub_(uint a, uint b) pure internal returns (uint) { return sub_(a, b, "subtraction underflow"); } function sub_(uint a, uint b, string memory errorMessage) pure internal returns (uint) { require(b <= a, errorMessage); return a - b; } function mul_(Exp memory a, Exp memory b) pure internal returns (Exp memory) { return Exp({mantissa: mul_(a.mantissa, b.mantissa) / expScale}); } function mul_(Exp memory a, uint b) pure internal returns (Exp memory) { return Exp({mantissa: mul_(a.mantissa, b)}); } function mul_(uint a, Exp memory b) pure internal returns (uint) { return mul_(a, b.mantissa) / expScale; } function mul_(Double memory a, Double memory b) pure internal returns (Double memory) { return Double({mantissa: mul_(a.mantissa, b.mantissa) / doubleScale}); } function mul_(Double memory a, uint b) pure internal returns (Double memory) { return Double({mantissa: mul_(a.mantissa, b)}); } function mul_(uint a, Double memory b) pure internal returns (uint) { return mul_(a, b.mantissa) / doubleScale; } function mul_(uint a, uint b) pure internal returns (uint) { return mul_(a, b, "multiplication overflow"); } function mul_(uint a, uint b, string memory errorMessage) pure internal returns (uint) { if (a == 0 || b == 0) { return 0; } uint c = a * b; require(c / a == b, errorMessage); return c; } function div_(Exp memory a, Exp memory b) pure internal returns (Exp memory) { return Exp({mantissa: div_(mul_(a.mantissa, expScale), b.mantissa)}); } function div_(Exp memory a, uint b) pure internal returns (Exp memory) { return Exp({mantissa: div_(a.mantissa, b)}); } function div_(uint a, Exp memory b) pure internal returns (uint) { return div_(mul_(a, expScale), b.mantissa); } function div_(Double memory a, Double memory b) pure internal returns (Double memory) { return Double({mantissa: div_(mul_(a.mantissa, doubleScale), b.mantissa)}); } function div_(Double memory a, uint b) pure internal returns (Double memory) { return Double({mantissa: div_(a.mantissa, b)}); } function div_(uint a, Double memory b) pure internal returns (uint) { return div_(mul_(a, doubleScale), b.mantissa); } function div_(uint a, uint b) pure internal returns (uint) { return div_(a, b, "divide by zero"); } function div_(uint a, uint b, string memory errorMessage) pure internal returns (uint) { require(b > 0, errorMessage); return a / b; } function fraction(uint a, uint b) pure internal returns (Double memory) { return Double({mantissa: div_(mul_(a, doubleScale), b)}); } }
pragma solidity ^0.5.16; interface IFuseFeeDistributor { function minBorrowEth() external view returns (uint256); function maxSupplyEth() external view returns (uint256); function maxUtilizationRate() external view returns (uint256); function interestFeeRate() external view returns (uint256); function comptrollerImplementationWhitelist(address oldImplementation, address newImplementation) external view returns (bool); function cErc20DelegateWhitelist(address oldImplementation, address newImplementation, bool allowResign) external view returns (bool); function cEtherDelegateWhitelist(address oldImplementation, address newImplementation, bool allowResign) external view returns (bool); function latestComptrollerImplementation(address oldImplementation) external view returns (address); function latestCErc20Delegate(address oldImplementation) external view returns (address cErc20Delegate, bool allowResign, bytes memory becomeImplementationData); function latestCEtherDelegate(address oldImplementation) external view returns (address cEtherDelegate, bool allowResign, bytes memory becomeImplementationData); function deployCEther(bytes calldata constructorData) external returns (address); function deployCErc20(bytes calldata constructorData) external returns (address); function () external payable; }
pragma solidity ^0.5.16; /** * @title Compound's InterestRateModel Interface * @author Compound */ contract InterestRateModel { /// @notice Indicator that this is an InterestRateModel contract (for inspection) bool public constant isInterestRateModel = true; /** * @notice Calculates the current borrow interest rate per block * @param cash The total amount of cash the market has * @param borrows The total amount of borrows the market has outstanding * @param reserves The total 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) external view returns (uint); /** * @notice Calculates the current supply interest rate per block * @param cash The total amount of cash the market has * @param borrows The total amount of borrows the market has outstanding * @param reserves The total 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) external view returns (uint); }
pragma solidity ^0.5.16; import "./CToken.sol"; contract PriceOracle { /// @notice Indicator that this is a PriceOracle contract (for inspection) bool public constant isPriceOracle = true; /** * @notice Get the underlying price of a cToken asset * @param cToken The cToken to get the underlying price of * @return The underlying asset price mantissa (scaled by 1e18). * Zero means the price is unavailable. */ function getUnderlyingPrice(CToken cToken) external view returns (uint); }
pragma solidity ^0.5.16; import "./CToken.sol"; contract RewardsDistributorDelegatorStorage { /// @notice Administrator for this contract address public admin; /// @notice Pending administrator for this contract address public pendingAdmin; /// @notice Active brains of RewardsDistributor address public implementation; } /** * @title Storage for RewardsDistributorDelegate * @notice For future upgrades, do not change RewardsDistributorDelegateStorageV1. Create a new * contract which implements RewardsDistributorDelegateStorageV1 and following the naming convention * RewardsDistributorDelegateStorageVX. */ contract RewardsDistributorDelegateStorageV1 is RewardsDistributorDelegatorStorage { /// @dev The token to reward (i.e., COMP) address public rewardToken; struct CompMarketState { /// @notice The market's last updated compBorrowIndex or compSupplyIndex uint224 index; /// @notice The block number the index was last updated at uint32 block; } /// @notice A list of all markets CToken[] public allMarkets; /// @notice The portion of compRate that each market currently receives mapping(address => uint) public compSupplySpeeds; /// @notice The portion of compRate that each market currently receives mapping(address => uint) public compBorrowSpeeds; /// @notice The COMP market supply state for each market mapping(address => CompMarketState) public compSupplyState; /// @notice The COMP market borrow state for each market mapping(address => CompMarketState) public compBorrowState; /// @notice The COMP borrow index for each market for each supplier as of the last time they accrued COMP mapping(address => mapping(address => uint)) public compSupplierIndex; /// @notice The COMP borrow index for each market for each borrower as of the last time they accrued COMP mapping(address => mapping(address => uint)) public compBorrowerIndex; /// @notice The COMP accrued but not yet transferred to each user mapping(address => uint) public compAccrued; /// @notice The portion of COMP that each contributor receives per block mapping(address => uint) public compContributorSpeeds; /// @notice Last block at which a contributor's COMP rewards have been allocated mapping(address => uint) public lastContributorBlock; }
pragma solidity ^0.5.16; import "./ErrorReporter.sol"; import "./ComptrollerStorage.sol"; /** * @title Unitroller * @dev Storage for the comptroller is at this address, while execution is delegated to the `comptrollerImplementation`. * CTokens should reference this contract as their comptroller. */ contract Unitroller is UnitrollerAdminStorage, ComptrollerErrorReporter { /** * @notice Emitted when pendingComptrollerImplementation is changed */ event NewPendingImplementation(address oldPendingImplementation, address newPendingImplementation); /** * @notice Emitted when pendingComptrollerImplementation is accepted, which means comptroller implementation is updated */ event NewImplementation(address oldImplementation, address newImplementation); /** * @notice Event emitted when the Fuse admin rights are changed */ event FuseAdminRightsToggled(bool hasRights); /** * @notice Event emitted when the admin rights are changed */ event AdminRightsToggled(bool hasRights); /** * @notice Emitted when pendingAdmin is changed */ event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin); /** * @notice Emitted when pendingAdmin is accepted, which means admin is updated */ event NewAdmin(address oldAdmin, address newAdmin); constructor() public { // Set admin to caller admin = msg.sender; } /*** Admin Functions ***/ function _setPendingImplementation(address newPendingImplementation) public returns (uint) { if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_IMPLEMENTATION_OWNER_CHECK); } if (!fuseAdmin.comptrollerImplementationWhitelist(comptrollerImplementation, newPendingImplementation)) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_IMPLEMENTATION_CONTRACT_CHECK); } address oldPendingImplementation = pendingComptrollerImplementation; pendingComptrollerImplementation = newPendingImplementation; emit NewPendingImplementation(oldPendingImplementation, pendingComptrollerImplementation); return uint(Error.NO_ERROR); } /** * @notice Accepts new implementation of comptroller. msg.sender must be pendingImplementation * @dev Admin function for new implementation to accept it's role as implementation * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _acceptImplementation() public returns (uint) { // Check caller is pendingImplementation and pendingImplementation ≠ address(0) if (msg.sender != pendingComptrollerImplementation || pendingComptrollerImplementation == address(0)) { return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK); } // Save current values for inclusion in log address oldImplementation = comptrollerImplementation; address oldPendingImplementation = pendingComptrollerImplementation; comptrollerImplementation = pendingComptrollerImplementation; pendingComptrollerImplementation = address(0); emit NewImplementation(oldImplementation, comptrollerImplementation); emit NewPendingImplementation(oldPendingImplementation, pendingComptrollerImplementation); return uint(Error.NO_ERROR); } /** * @notice Toggles Fuse admin rights. * @param hasRights Boolean indicating if the Fuse admin is to have rights. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _toggleFuseAdminRights(bool hasRights) external returns (uint) { // Check caller = admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.TOGGLE_ADMIN_RIGHTS_OWNER_CHECK); } // Check that rights have not already been set to the desired value if (fuseAdminHasRights == hasRights) return uint(Error.NO_ERROR); // Set fuseAdminHasRights fuseAdminHasRights = hasRights; // Emit FuseAdminRightsToggled() emit FuseAdminRightsToggled(fuseAdminHasRights); return uint(Error.NO_ERROR); } /** * @notice Toggles admin rights. * @param hasRights Boolean indicating if the admin is to have rights. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _toggleAdminRights(bool hasRights) external returns (uint) { // Check caller = admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.TOGGLE_ADMIN_RIGHTS_OWNER_CHECK); } // Check that rights have not already been set to the desired value if (adminHasRights == hasRights) return uint(Error.NO_ERROR); // Set adminHasRights adminHasRights = hasRights; // Emit AdminRightsToggled() emit AdminRightsToggled(hasRights); return uint(Error.NO_ERROR); } /** * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer. * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer. * @param newPendingAdmin New pending admin. * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _setPendingAdmin(address newPendingAdmin) public returns (uint) { // Check caller = admin if (!hasAdminRights()) { return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_ADMIN_OWNER_CHECK); } // Save current value, if any, for inclusion in log address oldPendingAdmin = pendingAdmin; // Store pendingAdmin with value newPendingAdmin pendingAdmin = newPendingAdmin; // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin) emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin); return uint(Error.NO_ERROR); } /** * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin * @dev Admin function for pending admin to accept role and update admin * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _acceptAdmin() public returns (uint) { // Check caller is pendingAdmin and pendingAdmin ≠ address(0) if (msg.sender != pendingAdmin || msg.sender == address(0)) { return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_ADMIN_PENDING_ADMIN_CHECK); } // Save current values for inclusion in log address oldAdmin = admin; address oldPendingAdmin = pendingAdmin; // Store admin with value pendingAdmin admin = pendingAdmin; // Clear the pending value pendingAdmin = address(0); emit NewAdmin(oldAdmin, admin); emit NewPendingAdmin(oldPendingAdmin, pendingAdmin); return uint(Error.NO_ERROR); } /** * @dev Delegates execution to an implementation contract. * It returns to the external caller whatever the implementation returns * or forwards reverts. */ function () payable external { // Check for automatic implementation if (msg.sender != address(this)) { (bool callSuccess, bytes memory data) = address(this).staticcall(abi.encodeWithSignature("autoImplementation()")); bool autoImplementation; if (callSuccess) (autoImplementation) = abi.decode(data, (bool)); if (autoImplementation) { address latestComptrollerImplementation = fuseAdmin.latestComptrollerImplementation(comptrollerImplementation); if (comptrollerImplementation != latestComptrollerImplementation) { address oldImplementation = comptrollerImplementation; // Save current value for inclusion in log comptrollerImplementation = latestComptrollerImplementation; emit NewImplementation(oldImplementation, comptrollerImplementation); } } } // delegate all other functions to current implementation (bool success, ) = comptrollerImplementation.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) } } } }
Contract Security Audit
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CToken","name":"cToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"newSpeed","type":"uint256"}],"name":"CompSupplySpeedUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"contributor","type":"address"},{"indexed":false,"internalType":"uint256","name":"newSpeed","type":"uint256"}],"name":"ContributorCompSpeedUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract CToken","name":"cToken","type":"address"},{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":false,"internalType":"uint256","name":"compDelta","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"compBorrowIndex","type":"uint256"}],"name":"DistributedBorrowerComp","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract 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CToken","name":"cToken","type":"address"},{"internalType":"uint256","name":"compSpeed","type":"uint256"}],"name":"_setCompSupplySpeed","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"contributor","type":"address"},{"internalType":"uint256","name":"compSpeed","type":"uint256"}],"name":"_setContributorCompSpeed","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newPendingAdmin","type":"address"}],"name":"_setPendingAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"admin","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allMarkets","outputs":[{"internalType":"contract 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Contract Creation Code
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Swarm Source
bzzr://b9407bba61470277bd13480df9f2de9d16bd1f1fc37498f00d805247394e4cdc
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Multichain Portfolio | 25 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.