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•  contract ErrorReporter
•    - function fail(Error err, FailureInfo ...
•    - function failOpaque(FailureInfo info, ...
•  contract DSValue
•    - function peek()
•    - function read()
•  contract CarefulMath is ErrorRepor ...
•    - function mul(uint a, uint b)
•    - function div(uint a, uint b)
•    - function sub(uint a, uint b)
•    - function add(uint a, uint b)
•    - function addThenSub(uint a, uint b, u ...
•  contract Exponential is ErrorRepor ...
•    - function getExp(uint num, uint denom)
•    - function addExp(Exp memory a, Exp mem ...
•    - function subExp(Exp memory a, Exp mem ...
•    - function mulScalar(Exp memory a, uint ...
•    - function divScalar(Exp memory a, uint ...
•    - function divScalarByExp(uint scalar, ...
•    - function mulExp(Exp memory a, Exp mem ...
•    - function divExp(Exp memory a, Exp mem ...
•    - function truncate(Exp memory exp)
•    - function lessThanExp(Exp memory left, ...
•    - function lessThanOrEqualExp(Exp memor ...
•    - function greaterThanExp(Exp memory le ...
•    - function isZeroExp(Exp memory value)
•  contract PriceOracle is Exponentia ... *
•    - function()
•    - function failOracle(address asset, Or ...
•    - function failOracleWithDetails(addres ...
•    - function _setPendingAnchor(address as ...
•    - function _setPaused(bool requestedSta ...
•    - function _setPendingAnchorAdmin(addre ...
•    - function _acceptAnchorAdmin()
•    - function assetPrices(address asset)
•    - function getPrice(address asset)
•    - function setPrice(address asset, uint ...
•    - function setPriceInternal(address ass ...
•    - function setPriceStorageInternal(addr ...
•    - function calculateSwing(Exp memory an ...
•    - function capToMax(Exp memory anchorPr ...
•    - function setPrices(address[] assets, ...

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/**
 *Submitted for verification at Etherscan.io on 2020-08-02
*/

/**
 *Submitted for verification at Etherscan.io on 2020-07-29
*/

pragma solidity ^0.4.24;
contract ErrorReporter {

    /**
      * @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);

    enum Error {
        NO_ERROR,
        OPAQUE_ERROR, // To be used when reporting errors from upgradeable contracts; the opaque code should be given as `detail` in the `Failure` event
        UNAUTHORIZED,
        INTEGER_OVERFLOW,
        INTEGER_UNDERFLOW,
        DIVISION_BY_ZERO,
        BAD_INPUT,
        TOKEN_INSUFFICIENT_ALLOWANCE,
        TOKEN_INSUFFICIENT_BALANCE,
        TOKEN_TRANSFER_FAILED,
        MARKET_NOT_SUPPORTED,
        SUPPLY_RATE_CALCULATION_FAILED,
        BORROW_RATE_CALCULATION_FAILED,
        TOKEN_INSUFFICIENT_CASH,
        TOKEN_TRANSFER_OUT_FAILED,
        INSUFFICIENT_LIQUIDITY,
        INSUFFICIENT_BALANCE,
        INVALID_COLLATERAL_RATIO,
        MISSING_ASSET_PRICE,
        EQUITY_INSUFFICIENT_BALANCE,
        INVALID_CLOSE_AMOUNT_REQUESTED,
        ASSET_NOT_PRICED,
        INVALID_LIQUIDATION_DISCOUNT,
        INVALID_COMBINED_RISK_PARAMETERS
    }

    /*
     * 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 {
        BORROW_ACCOUNT_LIQUIDITY_CALCULATION_FAILED,
        BORROW_ACCOUNT_SHORTFALL_PRESENT,
        BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED,
        BORROW_AMOUNT_LIQUIDITY_SHORTFALL,
        BORROW_AMOUNT_VALUE_CALCULATION_FAILED,
        BORROW_MARKET_NOT_SUPPORTED,
        BORROW_NEW_BORROW_INDEX_CALCULATION_FAILED,
        BORROW_NEW_BORROW_RATE_CALCULATION_FAILED,
        BORROW_NEW_SUPPLY_INDEX_CALCULATION_FAILED,
        BORROW_NEW_SUPPLY_RATE_CALCULATION_FAILED,
        BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
        BORROW_NEW_TOTAL_BORROW_CALCULATION_FAILED,
        BORROW_NEW_TOTAL_CASH_CALCULATION_FAILED,
        BORROW_ORIGINATION_FEE_CALCULATION_FAILED,
        BORROW_TRANSFER_OUT_FAILED,
        EQUITY_WITHDRAWAL_AMOUNT_VALIDATION,
        EQUITY_WITHDRAWAL_CALCULATE_EQUITY,
        EQUITY_WITHDRAWAL_MODEL_OWNER_CHECK,
        EQUITY_WITHDRAWAL_TRANSFER_OUT_FAILED,
        LIQUIDATE_ACCUMULATED_BORROW_BALANCE_CALCULATION_FAILED,
        LIQUIDATE_ACCUMULATED_SUPPLY_BALANCE_CALCULATION_FAILED_BORROWER_COLLATERAL_ASSET,
        LIQUIDATE_ACCUMULATED_SUPPLY_BALANCE_CALCULATION_FAILED_LIQUIDATOR_COLLATERAL_ASSET,
        LIQUIDATE_AMOUNT_SEIZE_CALCULATION_FAILED,
        LIQUIDATE_BORROW_DENOMINATED_COLLATERAL_CALCULATION_FAILED,
        LIQUIDATE_CLOSE_AMOUNT_TOO_HIGH,
        LIQUIDATE_DISCOUNTED_REPAY_TO_EVEN_AMOUNT_CALCULATION_FAILED,
        LIQUIDATE_NEW_BORROW_INDEX_CALCULATION_FAILED_BORROWED_ASSET,
        LIQUIDATE_NEW_BORROW_INDEX_CALCULATION_FAILED_COLLATERAL_ASSET,
        LIQUIDATE_NEW_BORROW_RATE_CALCULATION_FAILED_BORROWED_ASSET,
        LIQUIDATE_NEW_SUPPLY_INDEX_CALCULATION_FAILED_BORROWED_ASSET,
        LIQUIDATE_NEW_SUPPLY_INDEX_CALCULATION_FAILED_COLLATERAL_ASSET,
        LIQUIDATE_NEW_SUPPLY_RATE_CALCULATION_FAILED_BORROWED_ASSET,
        LIQUIDATE_NEW_TOTAL_BORROW_CALCULATION_FAILED_BORROWED_ASSET,
        LIQUIDATE_NEW_TOTAL_CASH_CALCULATION_FAILED_BORROWED_ASSET,
        LIQUIDATE_NEW_TOTAL_SUPPLY_BALANCE_CALCULATION_FAILED_BORROWER_COLLATERAL_ASSET,
        LIQUIDATE_NEW_TOTAL_SUPPLY_BALANCE_CALCULATION_FAILED_LIQUIDATOR_COLLATERAL_ASSET,
        LIQUIDATE_TRANSFER_IN_FAILED,
        LIQUIDATE_TRANSFER_IN_NOT_POSSIBLE,
        REPAY_BORROW_ACCUMULATED_BALANCE_CALCULATION_FAILED,
        REPAY_BORROW_NEW_BORROW_INDEX_CALCULATION_FAILED,
        REPAY_BORROW_NEW_BORROW_RATE_CALCULATION_FAILED,
        REPAY_BORROW_NEW_SUPPLY_INDEX_CALCULATION_FAILED,
        REPAY_BORROW_NEW_SUPPLY_RATE_CALCULATION_FAILED,
        REPAY_BORROW_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
        REPAY_BORROW_NEW_TOTAL_BORROW_CALCULATION_FAILED,
        REPAY_BORROW_NEW_TOTAL_CASH_CALCULATION_FAILED,
        REPAY_BORROW_TRANSFER_IN_FAILED,
        REPAY_BORROW_TRANSFER_IN_NOT_POSSIBLE,
        SET_ADMIN_OWNER_CHECK,
        SET_ASSET_PRICE_CHECK_ORACLE,
        SET_MARKET_INTEREST_RATE_MODEL_OWNER_CHECK,
        SET_ORACLE_OWNER_CHECK,
        SET_ORIGINATION_FEE_OWNER_CHECK,
        SET_RISK_PARAMETERS_OWNER_CHECK,
        SET_RISK_PARAMETERS_VALIDATION,
        SUPPLY_ACCUMULATED_BALANCE_CALCULATION_FAILED,
        SUPPLY_MARKET_NOT_SUPPORTED,
        SUPPLY_NEW_BORROW_INDEX_CALCULATION_FAILED,
        SUPPLY_NEW_BORROW_RATE_CALCULATION_FAILED,
        SUPPLY_NEW_SUPPLY_INDEX_CALCULATION_FAILED,
        SUPPLY_NEW_SUPPLY_RATE_CALCULATION_FAILED,
        SUPPLY_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
        SUPPLY_NEW_TOTAL_CASH_CALCULATION_FAILED,
        SUPPLY_NEW_TOTAL_SUPPLY_CALCULATION_FAILED,
        SUPPLY_TRANSFER_IN_FAILED,
        SUPPLY_TRANSFER_IN_NOT_POSSIBLE,
        SUPPORT_MARKET_OWNER_CHECK,
        SUPPORT_MARKET_PRICE_CHECK,
        SUSPEND_MARKET_OWNER_CHECK,
        WITHDRAW_ACCOUNT_LIQUIDITY_CALCULATION_FAILED,
        WITHDRAW_ACCOUNT_SHORTFALL_PRESENT,
        WITHDRAW_ACCUMULATED_BALANCE_CALCULATION_FAILED,
        WITHDRAW_AMOUNT_LIQUIDITY_SHORTFALL,
        WITHDRAW_AMOUNT_VALUE_CALCULATION_FAILED,
        WITHDRAW_CAPACITY_CALCULATION_FAILED,
        WITHDRAW_NEW_BORROW_INDEX_CALCULATION_FAILED,
        WITHDRAW_NEW_BORROW_RATE_CALCULATION_FAILED,
        WITHDRAW_NEW_SUPPLY_INDEX_CALCULATION_FAILED,
        WITHDRAW_NEW_SUPPLY_RATE_CALCULATION_FAILED,
        WITHDRAW_NEW_TOTAL_BALANCE_CALCULATION_FAILED,
        WITHDRAW_NEW_TOTAL_SUPPLY_CALCULATION_FAILED,
        WITHDRAW_TRANSFER_OUT_FAILED,
        WITHDRAW_TRANSFER_OUT_NOT_POSSIBLE
    }


    /**
      * @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(FailureInfo info, uint opaqueError) internal returns (uint) {
        emit Failure(uint(Error.OPAQUE_ERROR), uint(info), opaqueError);

        return uint(Error.OPAQUE_ERROR);
    }

}
contract DSValue {
    // TODO: View or constant? It's clearly a view...
    function peek() public view returns (bytes32, bool);

    function read() public view returns (bytes32);
}
contract CarefulMath is ErrorReporter {

    /**
    * @dev Multiplies two numbers, returns an error on overflow.
    */
    function mul(uint a, uint b) internal pure returns (Error, uint) {
        if (a == 0) {
            return (Error.NO_ERROR, 0);
        }

        uint c = a * b;

        if (c / a != b) {
            return (Error.INTEGER_OVERFLOW, 0);
        } else {
            return (Error.NO_ERROR, c);
        }
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint a, uint b) internal pure returns (Error, uint) {
        if (b == 0) {
            return (Error.DIVISION_BY_ZERO, 0);
        }

        return (Error.NO_ERROR, a / b);
    }

    /**
    * @dev Subtracts two numbers, returns an error on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint a, uint b) internal pure returns (Error, uint) {
        if (b <= a) {
            return (Error.NO_ERROR, a - b);
        } else {
            return (Error.INTEGER_UNDERFLOW, 0);
        }
    }

    /**
    * @dev Adds two numbers, returns an error on overflow.
    */
    function add(uint a, uint b) internal pure returns (Error, uint) {
        uint c = a + b;

        if (c >= a) {
            return (Error.NO_ERROR, c);
        } else {
            return (Error.INTEGER_OVERFLOW, 0);
        }
    }

    /**
    * @dev add a and b and then subtract c
    */
    function addThenSub(uint a, uint b, uint c) internal pure returns (Error, uint) {
        (Error err0, uint sum) = add(a, b);

        if (err0 != Error.NO_ERROR) {
            return (err0, 0);
        }

        return sub(sum, c);
    }
}
contract Exponential is ErrorReporter, CarefulMath {

    // TODO: We may wish to put the result of 10**18 here instead of the expression.
    // Per https://solidity.readthedocs.io/en/latest/contracts.html#constant-state-variables
    // the optimizer MAY replace the expression 10**18 with its calculated value.
    uint constant expScale = 10**18;

    // See TODO on expScale
    uint constant halfExpScale = expScale/2;

    struct Exp {
        uint mantissa;
    }

    uint constant mantissaOne = 10**18;
    uint constant mantissaOneTenth = 10**17;

    /**
    * @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 (Error, Exp memory) {
        (Error err0, uint scaledNumerator) = mul(num, expScale);
        if (err0 != Error.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }

        (Error err1, uint rational) = div(scaledNumerator, denom);
        if (err1 != Error.NO_ERROR) {
            return (err1, Exp({mantissa: 0}));
        }

        return (Error.NO_ERROR, Exp({mantissa: rational}));
    }

    /**
    * @dev Adds two exponentials, returning a new exponential.
    */
    function addExp(Exp memory a, Exp memory b) pure internal returns (Error, Exp memory) {
        (Error error, uint result) = add(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 (Error, Exp memory) {
        (Error error, uint result) = sub(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 (Error, Exp memory) {
        (Error err0, uint scaledMantissa) = mul(a.mantissa, scalar);
        if (err0 != Error.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }

        return (Error.NO_ERROR, Exp({mantissa: scaledMantissa}));
    }

    /**
    * @dev Divide an Exp by a scalar, returning a new Exp.
    */
    function divScalar(Exp memory a, uint scalar) pure internal returns (Error, Exp memory) {
        (Error err0, uint descaledMantissa) = div(a.mantissa, scalar);
        if (err0 != Error.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }

        return (Error.NO_ERROR, Exp({mantissa: descaledMantissa}));
    }

    /**
    * @dev Divide a scalar by an Exp, returning a new Exp.
    */
    function divScalarByExp(uint scalar, Exp divisor) pure internal returns (Error, Exp memory) {
        /*
            We are doing this as:
            getExp(mul(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`
        */
        (Error err0, uint numerator) = mul(expScale, scalar);
        if (err0 != Error.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }
        return getExp(numerator, divisor.mantissa);
    }

    /**
    * @dev Multiplies two exponentials, returning a new exponential.
    */
    function mulExp(Exp memory a, Exp memory b) pure internal returns (Error, Exp memory) {

        (Error err0, uint doubleScaledProduct) = mul(a.mantissa, b.mantissa);
        if (err0 != Error.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.
        (Error err1, uint doubleScaledProductWithHalfScale) = add(halfExpScale, doubleScaledProduct);
        if (err1 != Error.NO_ERROR) {
            return (err1, Exp({mantissa: 0}));
        }

        (Error err2, uint product) = div(doubleScaledProductWithHalfScale, expScale);
        // The only error `div` can return is Error.DIVISION_BY_ZERO but we control `expScale` and it is not zero.
        assert(err2 == Error.NO_ERROR);

        return (Error.NO_ERROR, Exp({mantissa: product}));
    }

    /**
      * @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 (Error, Exp memory) {
        return getExp(a.mantissa, b.mantissa);
    }

    /**
      * @dev Truncates the given exp to a whole number value.
      *      For example, truncate(Exp{mantissa: 15 * (10**18)}) = 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 / 10**18;
    }

    /**
      * @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; //TODO: Add some simple tests and this in another PR yo.
    }

    /**
      * @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 first Exp is greater than second 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;
    }
}
contract PriceOracle is Exponential {

    /**
      * @dev flag for whether or not contract is paused
      *
      */
    bool public paused;

    uint public constant numBlocksPerPeriod = 240; // approximately 1 hour: 60 seconds/minute * 60 minutes/hour * 1 block/15 seconds

    uint public constant maxSwingMantissa = (10 ** 17); // 0.1

    /**
      * @dev Mapping of asset addresses to DSValue price oracle contracts. The price contracts
      *      should be DSValue contracts whose value is the `eth:asset` price scaled by 1e18.
      *      That is, 1 eth is worth how much of the asset (e.g. 1 eth = 100 USD). We want
      *      to know the inverse, which is how much eth is one asset worth. This `asset:eth`
      *      is the multiplicative inverse (in that example, 1/100). The math is a bit trickier
      *      since we need to descale the number by 1e18, inverse, and then rescale the number.
      *      We perform this operation to return the `asset:eth` price for these reader assets.
      *
      * map: assetAddress -> DSValue price oracle
      */
    mapping(address => DSValue) public readers;

    /**
      * @dev Mapping of asset addresses and their corresponding price in terms of Eth-Wei
      *      which is simply equal to AssetWeiPrice * 10e18. For instance, if OMG token was
      *      worth 5x Eth then the price for OMG would be 5*10e18 or Exp({mantissa: 5000000000000000000}).
      * map: assetAddress -> Exp
      */
    mapping(address => Exp) public _assetPrices;

    constructor(address _poster, address addr0, address reader0, address addr1, address reader1) public {
        anchorAdmin = msg.sender;
        poster = _poster;
        maxSwing = Exp({mantissa : maxSwingMantissa});

        // Make sure the assets are zero or different
        assert(addr0 == address(0) || (addr0 != addr1));

        if (addr0 != address(0)) {
            assert(reader0 != address(0));
            readers[addr0] = DSValue(reader0);
        } else {
            assert(reader0 == address(0));
        }

        if (addr1 != address(0)) {
            assert(reader1 != address(0));
            readers[addr1] = DSValue(reader1);
        } else {
            assert(reader1 == address(0));
        }
    }

    /**
      * @notice Do not pay into PriceOracle
      */
    function() payable public {
        revert();
    }

    enum OracleError {
        NO_ERROR,
        UNAUTHORIZED,
        FAILED_TO_SET_PRICE
    }

    enum OracleFailureInfo {
        ACCEPT_ANCHOR_ADMIN_PENDING_ANCHOR_ADMIN_CHECK,
        SET_PAUSED_OWNER_CHECK,
        SET_PENDING_ANCHOR_ADMIN_OWNER_CHECK,
        SET_PENDING_ANCHOR_PERMISSION_CHECK,
        SET_PRICE_CALCULATE_SWING,
        SET_PRICE_CAP_TO_MAX,
        SET_PRICE_MAX_SWING_CHECK,
        SET_PRICE_NO_ANCHOR_PRICE_OR_INITIAL_PRICE_ZERO,
        SET_PRICE_PERMISSION_CHECK,
        SET_PRICE_ZERO_PRICE,
        SET_PRICES_PARAM_VALIDATION,
        SET_PRICE_IS_READER_ASSET
    }

    /**
      * @dev `msgSender` is msg.sender; `error` corresponds to enum OracleError; `info` corresponds to enum OracleFailureInfo, and `detail` is an arbitrary
      * contract-specific code that enables us to report opaque error codes from upgradeable contracts.
      **/
    event OracleFailure(address msgSender, address asset, uint error, uint info, uint detail);

    /**
      * @dev use this when reporting a known error from the price oracle or a non-upgradeable collaborator
      *      Using Oracle in name because we already inherit a `fail` function from ErrorReporter.sol via Exponential.sol
      */
    function failOracle(address asset, OracleError err, OracleFailureInfo info) internal returns (uint) {
        emit OracleFailure(msg.sender, asset, uint(err), uint(info), 0);

        return uint(err);
    }

    /**
      * @dev Use this when reporting an error from the money market. Give the money market result as `details`
      */
    function failOracleWithDetails(address asset, OracleError err, OracleFailureInfo info, uint details) internal returns (uint) {
        emit OracleFailure(msg.sender, asset, uint(err), uint(info), details);

        return uint(err);
    }

    /**
      * @dev An administrator who can set the pending anchor value for assets.
      *      Set in the constructor.
      */
    address public anchorAdmin;

    /**
      * @dev pending anchor administrator for this contract.
      */
    address public pendingAnchorAdmin;

    /**
      * @dev Address of the price poster.
      *      Set in the constructor.
      */
    address public poster;

    /**
      * @dev maxSwing the maximum allowed percentage difference between a new price and the anchor's price
      *      Set only in the constructor
      */
    Exp public maxSwing;

    struct Anchor {
        // floor(block.number / numBlocksPerPeriod) + 1
        uint period;

        // Price in ETH, scaled by 10**18
        uint priceMantissa;
    }

    /**
      * @dev anchors by asset
      */
    mapping(address => Anchor) public anchors;

    /**
      * @dev pending anchor prices by asset
      */
    mapping(address => uint) public pendingAnchors;

    /**
      * @dev emitted when a pending anchor is set
      * @param asset Asset for which to set a pending anchor
      * @param oldScaledPrice if an unused pending anchor was present, its value; otherwise 0.
      * @param newScaledPrice the new scaled pending anchor price
      */
    event NewPendingAnchor(address anchorAdmin, address asset, uint oldScaledPrice, uint newScaledPrice);

    /**
      * @notice provides ability to override the anchor price for an asset
      * @dev Admin function to set the anchor price for an asset
      * @param asset Asset for which to override the anchor price
      * @param newScaledPrice New anchor price
      * @return uint 0=success, otherwise a failure (see enum OracleError for details)
      */
    function _setPendingAnchor(address asset, uint newScaledPrice) public returns (uint) {
        // Check caller = anchorAdmin. Note: Deliberately not allowing admin. They can just change anchorAdmin if desired.
        if (msg.sender != anchorAdmin) {
            return failOracle(asset, OracleError.UNAUTHORIZED, OracleFailureInfo.SET_PENDING_ANCHOR_PERMISSION_CHECK);
        }

        uint oldScaledPrice = pendingAnchors[asset];
        pendingAnchors[asset] = newScaledPrice;

        emit NewPendingAnchor(msg.sender, asset, oldScaledPrice, newScaledPrice);

        return uint(OracleError.NO_ERROR);
    }

    /**
      * @dev emitted for all price changes
      */
    event PricePosted(address asset, uint previousPriceMantissa, uint requestedPriceMantissa, uint newPriceMantissa);

    /**
      * @dev emitted if this contract successfully posts a capped-to-max price to the money market
      */
    event CappedPricePosted(address asset, uint requestedPriceMantissa, uint anchorPriceMantissa, uint cappedPriceMantissa);

    /**
      * @dev emitted when admin either pauses or resumes the contract; newState is the resulting state
      */
    event SetPaused(bool newState);

    /**
      * @dev emitted when pendingAnchorAdmin is changed
      */
    event NewPendingAnchorAdmin(address oldPendingAnchorAdmin, address newPendingAnchorAdmin);

    /**
      * @dev emitted when pendingAnchorAdmin is accepted, which means anchor admin is updated
      */
    event NewAnchorAdmin(address oldAnchorAdmin, address newAnchorAdmin);

    /**
      * @notice set `paused` to the specified state
      * @dev Admin function to pause or resume the market
      * @param requestedState value to assign to `paused`
      * @return uint 0=success, otherwise a failure
      */
    function _setPaused(bool requestedState) public returns (uint) {
        // Check caller = anchorAdmin
        if (msg.sender != anchorAdmin) {
            return failOracle(0, OracleError.UNAUTHORIZED, OracleFailureInfo.SET_PAUSED_OWNER_CHECK);
        }

        paused = requestedState;
        emit SetPaused(requestedState);

        return uint(Error.NO_ERROR);
    }

    /**
      * @notice Begins transfer of anchor admin rights. The newPendingAnchorAdmin must call `_acceptAnchorAdmin` to finalize the transfer.
      * @dev Admin function to begin change of anchor admin. The newPendingAnchorAdmin must call `_acceptAnchorAdmin` to finalize the transfer.
      * @param newPendingAnchorAdmin New pending anchor admin.
      * @return uint 0=success, otherwise a failure
      *
      * TODO: Should we add a second arg to verify, like a checksum of `newAnchorAdmin` address?
      */
    function _setPendingAnchorAdmin(address newPendingAnchorAdmin) public returns (uint) {
        // Check caller = anchorAdmin
        if (msg.sender != anchorAdmin) {
            return failOracle(0, OracleError.UNAUTHORIZED, OracleFailureInfo.SET_PENDING_ANCHOR_ADMIN_OWNER_CHECK);
        }

        // save current value, if any, for inclusion in log
        address oldPendingAnchorAdmin = pendingAnchorAdmin;
        // Store pendingAdmin = newPendingAdmin
        pendingAnchorAdmin = newPendingAnchorAdmin;

        emit NewPendingAnchorAdmin(oldPendingAnchorAdmin, newPendingAnchorAdmin);

        return uint(Error.NO_ERROR);
    }

    /**
      * @notice Accepts transfer of anchor admin rights. msg.sender must be pendingAnchorAdmin
      * @dev Admin function for pending anchor admin to accept role and update anchor admin
      * @return uint 0=success, otherwise a failure
      */
    function _acceptAnchorAdmin() public returns (uint) {
        // Check caller = pendingAnchorAdmin
        // msg.sender can't be zero
        if (msg.sender != pendingAnchorAdmin) {
            return failOracle(0, OracleError.UNAUTHORIZED, OracleFailureInfo.ACCEPT_ANCHOR_ADMIN_PENDING_ANCHOR_ADMIN_CHECK);
        }

        // Save current value for inclusion in log
        address oldAnchorAdmin = anchorAdmin;
        // Store admin = pendingAnchorAdmin
        anchorAdmin = pendingAnchorAdmin;
        // Clear the pending value
        pendingAnchorAdmin = 0;

        emit NewAnchorAdmin(oldAnchorAdmin, msg.sender);

        return uint(Error.NO_ERROR);
    }

    /**
      * @notice retrieves price of an asset
      * @dev function to get price for an asset
      * @param asset Asset for which to get the price
      * @return uint mantissa of asset price (scaled by 1e18) or zero if unset or contract paused
      */
    function assetPrices(address asset) public view returns (uint) {
        // Note: zero is treated by the money market as an invalid
        //       price and will cease operations with that asset
        //       when zero.
        //
        // We get the price as:
        //
        //  1. If the contract is paused, return 0.
        //  2. If the asset is a reader asset:
        //    a. If the reader has a value set, invert it and return.
        //    b. Else, return 0.
        //  3. Return price in `_assetPrices`, which may be zero.

        if (paused) {
            return 0;
        } else {
            if (readers[asset] != address(0)) {
                (bytes32 readValue, bool foundValue) = readers[asset].peek();

                if (foundValue) {
                    (Error error, Exp memory invertedVal) = getExp(mantissaOne, uint256(readValue));

                    if (error != Error.NO_ERROR) {
                        return 0;
                    }

                    return invertedVal.mantissa;
                } else {
                    return 0;
                }
            } else {
                return _assetPrices[asset].mantissa;
            }
        }
    }

    /**
      * @notice retrieves price of an asset
      * @dev function to get price for an asset
      * @param asset Asset for which to get the price
      * @return uint mantissa of asset price (scaled by 1e18) or zero if unset or contract paused
      */
    function getPrice(address asset) public view returns (uint) {
        return assetPrices(asset);
    }

    struct SetPriceLocalVars {
        Exp price;
        Exp swing;
        Exp anchorPrice;
        uint anchorPeriod;
        uint currentPeriod;
        bool priceCapped;
        uint cappingAnchorPriceMantissa;
        uint pendingAnchorMantissa;
    }

    /**
      * @notice entry point for updating prices
      * @dev function to set price for an asset
      * @param asset Asset for which to set the price
      * @param requestedPriceMantissa requested new price, scaled by 10**18
      * @return uint 0=success, otherwise a failure (see enum OracleError for details)
      */
    function setPrice(address asset, uint requestedPriceMantissa) public returns (uint) {
        // Fail when msg.sender is not poster
        if (msg.sender != poster) {
            return failOracle(asset, OracleError.UNAUTHORIZED, OracleFailureInfo.SET_PRICE_PERMISSION_CHECK);
        }

        return setPriceInternal(asset, requestedPriceMantissa);
    }

    function setPriceInternal(address asset, uint requestedPriceMantissa) internal returns (uint) {
        // re-used for intermediate errors
        Error err;
        SetPriceLocalVars memory localVars;
        // We add 1 for currentPeriod so that it can never be zero and there's no ambiguity about an unset value.
        // (It can be a problem in tests with low block numbers.)
        localVars.currentPeriod = (block.number / numBlocksPerPeriod) + 1;
        localVars.pendingAnchorMantissa = pendingAnchors[asset];
        localVars.price = Exp({mantissa : requestedPriceMantissa});

        if (readers[asset] != address(0)) {
            return failOracle(asset, OracleError.FAILED_TO_SET_PRICE, OracleFailureInfo.SET_PRICE_IS_READER_ASSET);
        }

        if (localVars.pendingAnchorMantissa != 0) {
            // let's explicitly set to 0 rather than relying on default of declaration
            localVars.anchorPeriod = 0;
            localVars.anchorPrice = Exp({mantissa : localVars.pendingAnchorMantissa});

            // Verify movement is within max swing of pending anchor (currently: 10%)
            (err, localVars.swing) = calculateSwing(localVars.anchorPrice, localVars.price);
            if (err != Error.NO_ERROR) {
                return failOracleWithDetails(asset, OracleError.FAILED_TO_SET_PRICE, OracleFailureInfo.SET_PRICE_CALCULATE_SWING, uint(err));
            }

            // Fail when swing > maxSwing
            if (greaterThanExp(localVars.swing, maxSwing)) {
                return failOracleWithDetails(asset, OracleError.FAILED_TO_SET_PRICE, OracleFailureInfo.SET_PRICE_MAX_SWING_CHECK, localVars.swing.mantissa);
            }
        } else {
            localVars.anchorPeriod = anchors[asset].period;
            localVars.anchorPrice = Exp({mantissa : anchors[asset].priceMantissa});

            if (localVars.anchorPeriod != 0) {
                (err, localVars.priceCapped, localVars.price) = capToMax(localVars.anchorPrice, localVars.price);
                if (err != Error.NO_ERROR) {
                    return failOracleWithDetails(asset, OracleError.FAILED_TO_SET_PRICE, OracleFailureInfo.SET_PRICE_CAP_TO_MAX, uint(err));
                }
                if (localVars.priceCapped) {
                    // save for use in log
                    localVars.cappingAnchorPriceMantissa = localVars.anchorPrice.mantissa;
                }
            } else {
                // Setting first price. Accept as is (already assigned above from requestedPriceMantissa) and use as anchor
                localVars.anchorPrice = Exp({mantissa : requestedPriceMantissa});
            }
        }

        // Fail if anchorPrice or price is zero.
        // zero anchor represents an unexpected situation likely due to a problem in this contract
        // zero price is more likely as the result of bad input from the caller of this function
        if (isZeroExp(localVars.anchorPrice)) {
            // If we get here price could also be zero, but it does not seem worthwhile to distinguish the 3rd case
            return failOracle(asset, OracleError.FAILED_TO_SET_PRICE, OracleFailureInfo.SET_PRICE_NO_ANCHOR_PRICE_OR_INITIAL_PRICE_ZERO);
        }

        if (isZeroExp(localVars.price)) {
            return failOracle(asset, OracleError.FAILED_TO_SET_PRICE, OracleFailureInfo.SET_PRICE_ZERO_PRICE);
        }

        // BEGIN SIDE EFFECTS

        // Set pendingAnchor = Nothing
        // Pending anchor is only used once.
        if (pendingAnchors[asset] != 0) {
            pendingAnchors[asset] = 0;
        }

        // If currentPeriod > anchorPeriod:
        //  Set anchors[asset] = (currentPeriod, price)
        //  The new anchor is if we're in a new period or we had a pending anchor, then we become the new anchor
        if (localVars.currentPeriod > localVars.anchorPeriod) {
            anchors[asset] = Anchor({period : localVars.currentPeriod, priceMantissa : localVars.price.mantissa});
        }

        uint previousPrice = _assetPrices[asset].mantissa;

        setPriceStorageInternal(asset, localVars.price.mantissa);

        emit PricePosted(asset, previousPrice, requestedPriceMantissa, localVars.price.mantissa);

        if (localVars.priceCapped) {
            // We have set a capped price. Log it so we can detect the situation and investigate.
            emit CappedPricePosted(asset, requestedPriceMantissa, localVars.cappingAnchorPriceMantissa, localVars.price.mantissa);
        }

        return uint(OracleError.NO_ERROR);
    }

    // As a function to allow harness overrides
    function setPriceStorageInternal(address asset, uint256 priceMantissa) internal {
        _assetPrices[asset] = Exp({mantissa: priceMantissa});
    }

    // abs(price - anchorPrice) / anchorPrice
    function calculateSwing(Exp memory anchorPrice, Exp memory price) pure internal returns (Error, Exp memory) {
        Exp memory numerator;
        Error err;

        if (greaterThanExp(anchorPrice, price)) {
            (err, numerator) = subExp(anchorPrice, price);
            // can't underflow
            assert(err == Error.NO_ERROR);
        } else {
            (err, numerator) = subExp(price, anchorPrice);
            // Given greaterThan check above, price >= anchorPrice so can't underflow.
            assert(err == Error.NO_ERROR);
        }

        return divExp(numerator, anchorPrice);
    }

    function capToMax(Exp memory anchorPrice, Exp memory price) view internal returns (Error, bool, Exp memory) {
        Exp memory one = Exp({mantissa : mantissaOne});
        Exp memory onePlusMaxSwing;
        Exp memory oneMinusMaxSwing;
        Exp memory max;
        Exp memory min;
        // re-used for intermediate errors
        Error err;

        (err, onePlusMaxSwing) = addExp(one, maxSwing);
        if (err != Error.NO_ERROR) {
            return (err, false, Exp({mantissa : 0}));
        }

        // max = anchorPrice * (1 + maxSwing)
        (err, max) = mulExp(anchorPrice, onePlusMaxSwing);
        if (err != Error.NO_ERROR) {
            return (err, false, Exp({mantissa : 0}));
        }

        // If price > anchorPrice * (1 + maxSwing)
        // Set price = anchorPrice * (1 + maxSwing)
        if (greaterThanExp(price, max)) {
            return (Error.NO_ERROR, true, max);
        }

        (err, oneMinusMaxSwing) = subExp(one, maxSwing);
        if (err != Error.NO_ERROR) {
            return (err, false, Exp({mantissa : 0}));
        }

        // min = anchorPrice * (1 - maxSwing)
        (err, min) = mulExp(anchorPrice, oneMinusMaxSwing);
        // We can't overflow here or we would have already overflowed above when calculating `max`
        assert(err == Error.NO_ERROR);

        // If  price < anchorPrice * (1 - maxSwing)
        // Set price = anchorPrice * (1 - maxSwing)
        if (lessThanExp(price, min)) {
            return (Error.NO_ERROR, true, min);
        }

        return (Error.NO_ERROR, false, price);
    }

    /**
      * @notice entry point for updating multiple prices
      * @dev function to set prices for a variable number of assets.
      * @param assets a list of up to assets for which to set a price. required: 0 < assets.length == requestedPriceMantissas.length
      * @param requestedPriceMantissas requested new prices for the assets, scaled by 10**18. required: 0 < assets.length == requestedPriceMantissas.length
      * @return uint values in same order as inputs. For each: 0=success, otherwise a failure (see enum OracleError for details)
      */
    function setPrices(address[] assets, uint[] requestedPriceMantissas) public returns (uint[] memory) {
        uint numAssets = assets.length;
        uint numPrices = requestedPriceMantissas.length;
        uint[] memory result;

        // Fail when msg.sender is not poster
        if (msg.sender != poster) {
            result = new uint[](1);
            result[0] = failOracle(0, OracleError.UNAUTHORIZED, OracleFailureInfo.SET_PRICE_PERMISSION_CHECK);
            return result;
        }

        if ((numAssets == 0) || (numPrices != numAssets)) {
            result = new uint[](1);
            result[0] = failOracle(0, OracleError.FAILED_TO_SET_PRICE, OracleFailureInfo.SET_PRICES_PARAM_VALIDATION);
            return result;
        }

        result = new uint[](numAssets);

        for (uint i = 0; i < numAssets; i++) {
            result[i] = setPriceInternal(assets[i], requestedPriceMantissas[i]);
        }

        return result;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000612aca17160cc50b3aa777f9790615905d01c0bf0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _poster (address): 0x612acA17160cc50b3AA777F9790615905d01c0bF
Arg [1] : addr0 (address): 0x0000000000000000000000000000000000000000
Arg [2] : reader0 (address): 0x0000000000000000000000000000000000000000
Arg [3] : addr1 (address): 0x0000000000000000000000000000000000000000
Arg [4] : reader1 (address): 0x0000000000000000000000000000000000000000

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000612aca17160cc50b3aa777f9790615905d01c0bf
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000

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