OP Sepolia Testnet

Contract

0xF36789ABc1f0F11a23B9e2184455919e437D0e3B

Overview

ETH Balance

0 ETH

Sponsored

Transaction Hash
Method
Block
From
To
Value
Take Debt Snapsh...107405442024-04-16 16:07:0869 days ago1713283628IN
0xF36789AB...e437D0e3B
0 ETH0.013154721.50000025
Take Debt Snapsh...105282212024-04-11 18:09:4273 days ago1712858982IN
0xF36789AB...e437D0e3B
0 ETH0.013315011.50000025
Import Excluded ...105281832024-04-11 18:08:2673 days ago1712858906IN
0xF36789AB...e437D0e3B
0 ETH00.00010025
0x60806040105281322024-04-11 18:06:4473 days ago1712858804IN
 Create: DebtCache
0 ETH0.00000030.00010025

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Contract Source Code Verified (Exact Match)

Contract Name:
DebtCache

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at sepolia-optimm.etherscan.io on 2024-04-11
*/

/*
   ____            __   __        __   _
  / __/__ __ ___  / /_ / /  ___  / /_ (_)__ __
 _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
     /___/

* Synthetix: DebtCache.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/DebtCache.sol
* Docs: https://docs.synthetix.io/contracts/DebtCache
*
* Contract Dependencies: 
*	- BaseDebtCache
*	- IAddressResolver
*	- IDebtCache
*	- MixinResolver
*	- MixinSystemSettings
*	- Owned
* Libraries: 
*	- SafeDecimalMath
*	- SafeMath
*
* MIT License
* ===========
*
* Copyright (c) 2024 Synthetix
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/



pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}


// Libraries


// https://docs.synthetix.io/contracts/source/libraries/safedecimalmath
library SafeDecimalMath {
    using SafeMath for uint;

    /* Number of decimal places in the representations. */
    uint8 public constant decimals = 18;
    uint8 public constant highPrecisionDecimals = 27;

    /* The number representing 1.0. */
    uint public constant UNIT = 10**uint(decimals);

    /* The number representing 1.0 for higher fidelity numbers. */
    uint public constant PRECISE_UNIT = 10**uint(highPrecisionDecimals);
    uint private constant UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR = 10**uint(highPrecisionDecimals - decimals);

    /**
     * @return Provides an interface to UNIT.
     */
    function unit() external pure returns (uint) {
        return UNIT;
    }

    /**
     * @return Provides an interface to PRECISE_UNIT.
     */
    function preciseUnit() external pure returns (uint) {
        return PRECISE_UNIT;
    }

    /**
     * @return The result of multiplying x and y, interpreting the operands as fixed-point
     * decimals.
     *
     * @dev A unit factor is divided out after the product of x and y is evaluated,
     * so that product must be less than 2**256. As this is an integer division,
     * the internal division always rounds down. This helps save on gas. Rounding
     * is more expensive on gas.
     */
    function multiplyDecimal(uint x, uint y) internal pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        return x.mul(y) / UNIT;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of the specified precision unit.
     *
     * @dev The operands should be in the form of a the specified unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function _multiplyDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        uint quotientTimesTen = x.mul(y) / (precisionUnit / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a precise unit.
     *
     * @dev The operands should be in the precise unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a standard unit.
     *
     * @dev The operands should be in the standard unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is a high
     * precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and UNIT must be less than 2**256. As
     * this is an integer division, the result is always rounded down.
     * This helps save on gas. Rounding is more expensive on gas.
     */
    function divideDecimal(uint x, uint y) internal pure returns (uint) {
        /* Reintroduce the UNIT factor that will be divided out by y. */
        return x.mul(UNIT).div(y);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * decimal in the precision unit specified in the parameter.
     *
     * @dev y is divided after the product of x and the specified precision unit
     * is evaluated, so the product of x and the specified precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function _divideDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        uint resultTimesTen = x.mul(precisionUnit * 10).div(y);

        if (resultTimesTen % 10 >= 5) {
            resultTimesTen += 10;
        }

        return resultTimesTen / 10;
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * standard precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and the standard precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * high precision decimal.
     *
     * @dev y is divided after the product of x and the high precision unit
     * is evaluated, so the product of x and the high precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @dev Convert a standard decimal representation to a high precision one.
     */
    function decimalToPreciseDecimal(uint i) internal pure returns (uint) {
        return i.mul(UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR);
    }

    /**
     * @dev Convert a high precision decimal to a standard decimal representation.
     */
    function preciseDecimalToDecimal(uint i) internal pure returns (uint) {
        uint quotientTimesTen = i / (UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    // Computes `a - b`, setting the value to 0 if b > a.
    function floorsub(uint a, uint b) internal pure returns (uint) {
        return b >= a ? 0 : a - b;
    }

    /* ---------- Utilities ---------- */
    /*
     * Absolute value of the input, returned as a signed number.
     */
    function signedAbs(int x) internal pure returns (int) {
        return x < 0 ? -x : x;
    }

    /*
     * Absolute value of the input, returned as an unsigned number.
     */
    function abs(int x) internal pure returns (uint) {
        return uint(signedAbs(x));
    }
}


// https://docs.synthetix.io/contracts/source/contracts/owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}


// https://docs.synthetix.io/contracts/source/interfaces/iaddressresolver
interface IAddressResolver {
    function getAddress(bytes32 name) external view returns (address);

    function getSynth(bytes32 key) external view returns (address);

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address);
}


// https://docs.synthetix.io/contracts/source/interfaces/isynth
interface ISynth {
    // Views
    function currencyKey() external view returns (bytes32);

    function transferableSynths(address account) external view returns (uint);

    // Mutative functions
    function transferAndSettle(address to, uint value) external returns (bool);

    function transferFromAndSettle(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Restricted: used internally to Synthetix
    function burn(address account, uint amount) external;

    function issue(address account, uint amount) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/iissuer
interface IIssuer {
    // Views

    function allNetworksDebtInfo()
        external
        view
        returns (
            uint256 debt,
            uint256 sharesSupply,
            bool isStale
        );

    function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid);

    function availableCurrencyKeys() external view returns (bytes32[] memory);

    function availableSynthCount() external view returns (uint);

    function availableSynths(uint index) external view returns (ISynth);

    function canBurnSynths(address account) external view returns (bool);

    function collateral(address account) external view returns (uint);

    function collateralisationRatio(address issuer) external view returns (uint);

    function collateralisationRatioAndAnyRatesInvalid(address _issuer)
        external
        view
        returns (uint cratio, bool anyRateIsInvalid);

    function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint debtBalance);

    function issuanceRatio() external view returns (uint);

    function lastIssueEvent(address account) external view returns (uint);

    function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);

    function minimumStakeTime() external view returns (uint);

    function remainingIssuableSynths(address issuer)
        external
        view
        returns (
            uint maxIssuable,
            uint alreadyIssued,
            uint totalSystemDebt
        );

    function synths(bytes32 currencyKey) external view returns (ISynth);

    function getSynths(bytes32[] calldata currencyKeys) external view returns (ISynth[] memory);

    function synthsByAddress(address synthAddress) external view returns (bytes32);

    function totalIssuedSynths(bytes32 currencyKey, bool excludeOtherCollateral) external view returns (uint);

    function transferableSynthetixAndAnyRateIsInvalid(address account, uint balance)
        external
        view
        returns (uint transferable, bool anyRateIsInvalid);

    function liquidationAmounts(address account, bool isSelfLiquidation)
        external
        view
        returns (
            uint totalRedeemed,
            uint debtToRemove,
            uint escrowToLiquidate,
            uint initialDebtBalance
        );

    // Restricted: used internally to Synthetix
    function addSynths(ISynth[] calldata synthsToAdd) external;

    function issueSynths(address from, uint amount) external;

    function issueSynthsOnBehalf(
        address issueFor,
        address from,
        uint amount
    ) external;

    function issueMaxSynths(address from) external;

    function issueMaxSynthsOnBehalf(address issueFor, address from) external;

    function burnSynths(address from, uint amount) external;

    function burnSynthsOnBehalf(
        address burnForAddress,
        address from,
        uint amount
    ) external;

    function burnSynthsToTarget(address from) external;

    function burnSynthsToTargetOnBehalf(address burnForAddress, address from) external;

    function burnForRedemption(
        address deprecatedSynthProxy,
        address account,
        uint balance
    ) external;

    function setCurrentPeriodId(uint128 periodId) external;

    function liquidateAccount(address account, bool isSelfLiquidation)
        external
        returns (
            uint totalRedeemed,
            uint debtRemoved,
            uint escrowToLiquidate
        );

    function issueSynthsWithoutDebt(
        bytes32 currencyKey,
        address to,
        uint amount
    ) external returns (bool rateInvalid);

    function burnSynthsWithoutDebt(
        bytes32 currencyKey,
        address to,
        uint amount
    ) external returns (bool rateInvalid);

    function burnAndIssueSynthsWithoutDebtCache(
        address account,
        bytes32 currencyKey,
        uint amountOfSynth,
        uint amountInsUSD
    ) external;

    function modifyDebtSharesForMigration(address account, uint amount) external;
}


// Inheritance


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/addressresolver
contract AddressResolver is Owned, IAddressResolver {
    mapping(bytes32 => address) public repository;

    constructor(address _owner) public Owned(_owner) {}

    /* ========== RESTRICTED FUNCTIONS ========== */

    function importAddresses(bytes32[] calldata names, address[] calldata destinations) external onlyOwner {
        require(names.length == destinations.length, "Input lengths must match");

        for (uint i = 0; i < names.length; i++) {
            bytes32 name = names[i];
            address destination = destinations[i];
            repository[name] = destination;
            emit AddressImported(name, destination);
        }
    }

    /* ========= PUBLIC FUNCTIONS ========== */

    function rebuildCaches(MixinResolver[] calldata destinations) external {
        for (uint i = 0; i < destinations.length; i++) {
            destinations[i].rebuildCache();
        }
    }

    /* ========== VIEWS ========== */

    function areAddressesImported(bytes32[] calldata names, address[] calldata destinations) external view returns (bool) {
        for (uint i = 0; i < names.length; i++) {
            if (repository[names[i]] != destinations[i]) {
                return false;
            }
        }
        return true;
    }

    function getAddress(bytes32 name) external view returns (address) {
        return repository[name];
    }

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address) {
        address _foundAddress = repository[name];
        require(_foundAddress != address(0), reason);
        return _foundAddress;
    }

    function getSynth(bytes32 key) external view returns (address) {
        IIssuer issuer = IIssuer(repository["Issuer"]);
        require(address(issuer) != address(0), "Cannot find Issuer address");
        return address(issuer.synths(key));
    }

    /* ========== EVENTS ========== */

    event AddressImported(bytes32 name, address destination);
}


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/mixinresolver
contract MixinResolver {
    AddressResolver public resolver;

    mapping(bytes32 => address) private addressCache;

    constructor(address _resolver) internal {
        resolver = AddressResolver(_resolver);
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    function combineArrays(bytes32[] memory first, bytes32[] memory second)
        internal
        pure
        returns (bytes32[] memory combination)
    {
        combination = new bytes32[](first.length + second.length);

        for (uint i = 0; i < first.length; i++) {
            combination[i] = first[i];
        }

        for (uint j = 0; j < second.length; j++) {
            combination[first.length + j] = second[j];
        }
    }

    /* ========== PUBLIC FUNCTIONS ========== */

    // Note: this function is public not external in order for it to be overridden and invoked via super in subclasses
    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {}

    function rebuildCache() public {
        bytes32[] memory requiredAddresses = resolverAddressesRequired();
        // The resolver must call this function whenver it updates its state
        for (uint i = 0; i < requiredAddresses.length; i++) {
            bytes32 name = requiredAddresses[i];
            // Note: can only be invoked once the resolver has all the targets needed added
            address destination =
                resolver.requireAndGetAddress(name, string(abi.encodePacked("Resolver missing target: ", name)));
            addressCache[name] = destination;
            emit CacheUpdated(name, destination);
        }
    }

    /* ========== VIEWS ========== */

    function isResolverCached() external view returns (bool) {
        bytes32[] memory requiredAddresses = resolverAddressesRequired();
        for (uint i = 0; i < requiredAddresses.length; i++) {
            bytes32 name = requiredAddresses[i];
            // false if our cache is invalid or if the resolver doesn't have the required address
            if (resolver.getAddress(name) != addressCache[name] || addressCache[name] == address(0)) {
                return false;
            }
        }

        return true;
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    function requireAndGetAddress(bytes32 name) internal view returns (address) {
        address _foundAddress = addressCache[name];
        require(_foundAddress != address(0), string(abi.encodePacked("Missing address: ", name)));
        return _foundAddress;
    }

    /* ========== EVENTS ========== */

    event CacheUpdated(bytes32 name, address destination);
}


// https://docs.synthetix.io/contracts/source/interfaces/iflexiblestorage
interface IFlexibleStorage {
    // Views
    function getUIntValue(bytes32 contractName, bytes32 record) external view returns (uint);

    function getUIntValues(bytes32 contractName, bytes32[] calldata records) external view returns (uint[] memory);

    function getIntValue(bytes32 contractName, bytes32 record) external view returns (int);

    function getIntValues(bytes32 contractName, bytes32[] calldata records) external view returns (int[] memory);

    function getAddressValue(bytes32 contractName, bytes32 record) external view returns (address);

    function getAddressValues(bytes32 contractName, bytes32[] calldata records) external view returns (address[] memory);

    function getBoolValue(bytes32 contractName, bytes32 record) external view returns (bool);

    function getBoolValues(bytes32 contractName, bytes32[] calldata records) external view returns (bool[] memory);

    function getBytes32Value(bytes32 contractName, bytes32 record) external view returns (bytes32);

    function getBytes32Values(bytes32 contractName, bytes32[] calldata records) external view returns (bytes32[] memory);

    // Mutative functions
    function deleteUIntValue(bytes32 contractName, bytes32 record) external;

    function deleteIntValue(bytes32 contractName, bytes32 record) external;

    function deleteAddressValue(bytes32 contractName, bytes32 record) external;

    function deleteBoolValue(bytes32 contractName, bytes32 record) external;

    function deleteBytes32Value(bytes32 contractName, bytes32 record) external;

    function setUIntValue(
        bytes32 contractName,
        bytes32 record,
        uint value
    ) external;

    function setUIntValues(
        bytes32 contractName,
        bytes32[] calldata records,
        uint[] calldata values
    ) external;

    function setIntValue(
        bytes32 contractName,
        bytes32 record,
        int value
    ) external;

    function setIntValues(
        bytes32 contractName,
        bytes32[] calldata records,
        int[] calldata values
    ) external;

    function setAddressValue(
        bytes32 contractName,
        bytes32 record,
        address value
    ) external;

    function setAddressValues(
        bytes32 contractName,
        bytes32[] calldata records,
        address[] calldata values
    ) external;

    function setBoolValue(
        bytes32 contractName,
        bytes32 record,
        bool value
    ) external;

    function setBoolValues(
        bytes32 contractName,
        bytes32[] calldata records,
        bool[] calldata values
    ) external;

    function setBytes32Value(
        bytes32 contractName,
        bytes32 record,
        bytes32 value
    ) external;

    function setBytes32Values(
        bytes32 contractName,
        bytes32[] calldata records,
        bytes32[] calldata values
    ) external;
}


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/mixinsystemsettings
contract MixinSystemSettings is MixinResolver {
    // must match the one defined SystemSettingsLib, defined in both places due to sol v0.5 limitations
    bytes32 internal constant SETTING_CONTRACT_NAME = "SystemSettings";

    bytes32 internal constant SETTING_WAITING_PERIOD_SECS = "waitingPeriodSecs";
    bytes32 internal constant SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR = "priceDeviationThresholdFactor";
    bytes32 internal constant SETTING_ISSUANCE_RATIO = "issuanceRatio";
    bytes32 internal constant SETTING_FEE_PERIOD_DURATION = "feePeriodDuration";
    bytes32 internal constant SETTING_TARGET_THRESHOLD = "targetThreshold";
    bytes32 internal constant SETTING_LIQUIDATION_DELAY = "liquidationDelay";
    bytes32 internal constant SETTING_LIQUIDATION_RATIO = "liquidationRatio";
    bytes32 internal constant SETTING_LIQUIDATION_ESCROW_DURATION = "liquidationEscrowDuration";
    bytes32 internal constant SETTING_LIQUIDATION_PENALTY = "liquidationPenalty";
    bytes32 internal constant SETTING_SNX_LIQUIDATION_PENALTY = "snxLiquidationPenalty";
    bytes32 internal constant SETTING_SELF_LIQUIDATION_PENALTY = "selfLiquidationPenalty";
    bytes32 internal constant SETTING_FLAG_REWARD = "flagReward";
    bytes32 internal constant SETTING_LIQUIDATE_REWARD = "liquidateReward";
    bytes32 internal constant SETTING_RATE_STALE_PERIOD = "rateStalePeriod";
    /* ========== Exchange Fees Related ========== */
    bytes32 internal constant SETTING_EXCHANGE_FEE_RATE = "exchangeFeeRate";
    bytes32 internal constant SETTING_EXCHANGE_DYNAMIC_FEE_THRESHOLD = "exchangeDynamicFeeThreshold";
    bytes32 internal constant SETTING_EXCHANGE_DYNAMIC_FEE_WEIGHT_DECAY = "exchangeDynamicFeeWeightDecay";
    bytes32 internal constant SETTING_EXCHANGE_DYNAMIC_FEE_ROUNDS = "exchangeDynamicFeeRounds";
    bytes32 internal constant SETTING_EXCHANGE_MAX_DYNAMIC_FEE = "exchangeMaxDynamicFee";
    /* ========== End Exchange Fees Related ========== */
    bytes32 internal constant SETTING_MINIMUM_STAKE_TIME = "minimumStakeTime";
    bytes32 internal constant SETTING_AGGREGATOR_WARNING_FLAGS = "aggregatorWarningFlags";
    bytes32 internal constant SETTING_TRADING_REWARDS_ENABLED = "tradingRewardsEnabled";
    bytes32 internal constant SETTING_DEBT_SNAPSHOT_STALE_TIME = "debtSnapshotStaleTime";
    bytes32 internal constant SETTING_CROSS_DOMAIN_DEPOSIT_GAS_LIMIT = "crossDomainDepositGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_ESCROW_GAS_LIMIT = "crossDomainEscrowGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_REWARD_GAS_LIMIT = "crossDomainRewardGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_WITHDRAWAL_GAS_LIMIT = "crossDomainWithdrawalGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_FEE_PERIOD_CLOSE_GAS_LIMIT = "crossDomainCloseGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_RELAY_GAS_LIMIT = "crossDomainRelayGasLimit";
    bytes32 internal constant SETTING_ETHER_WRAPPER_MAX_ETH = "etherWrapperMaxETH";
    bytes32 internal constant SETTING_ETHER_WRAPPER_MINT_FEE_RATE = "etherWrapperMintFeeRate";
    bytes32 internal constant SETTING_ETHER_WRAPPER_BURN_FEE_RATE = "etherWrapperBurnFeeRate";
    bytes32 internal constant SETTING_WRAPPER_MAX_TOKEN_AMOUNT = "wrapperMaxTokens";
    bytes32 internal constant SETTING_WRAPPER_MINT_FEE_RATE = "wrapperMintFeeRate";
    bytes32 internal constant SETTING_WRAPPER_BURN_FEE_RATE = "wrapperBurnFeeRate";
    bytes32 internal constant SETTING_INTERACTION_DELAY = "interactionDelay";
    bytes32 internal constant SETTING_COLLAPSE_FEE_RATE = "collapseFeeRate";
    bytes32 internal constant SETTING_ATOMIC_MAX_VOLUME_PER_BLOCK = "atomicMaxVolumePerBlock";
    bytes32 internal constant SETTING_ATOMIC_TWAP_WINDOW = "atomicTwapWindow";
    bytes32 internal constant SETTING_ATOMIC_EQUIVALENT_FOR_DEX_PRICING = "atomicEquivalentForDexPricing";
    bytes32 internal constant SETTING_ATOMIC_EXCHANGE_FEE_RATE = "atomicExchangeFeeRate";
    bytes32 internal constant SETTING_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW = "atomicVolConsiderationWindow";
    bytes32 internal constant SETTING_ATOMIC_VOLATILITY_UPDATE_THRESHOLD = "atomicVolUpdateThreshold";
    bytes32 internal constant SETTING_PURE_CHAINLINK_PRICE_FOR_ATOMIC_SWAPS_ENABLED = "pureChainlinkForAtomicsEnabled";
    bytes32 internal constant SETTING_CROSS_SYNTH_TRANSFER_ENABLED = "crossChainSynthTransferEnabled";

    bytes32 internal constant CONTRACT_FLEXIBLESTORAGE = "FlexibleStorage";

    enum CrossDomainMessageGasLimits {Deposit, Escrow, Reward, Withdrawal, CloseFeePeriod, Relay}

    struct DynamicFeeConfig {
        uint threshold;
        uint weightDecay;
        uint rounds;
        uint maxFee;
    }

    constructor(address _resolver) internal MixinResolver(_resolver) {}

    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        addresses = new bytes32[](1);
        addresses[0] = CONTRACT_FLEXIBLESTORAGE;
    }

    function flexibleStorage() internal view returns (IFlexibleStorage) {
        return IFlexibleStorage(requireAndGetAddress(CONTRACT_FLEXIBLESTORAGE));
    }

    function _getGasLimitSetting(CrossDomainMessageGasLimits gasLimitType) internal pure returns (bytes32) {
        if (gasLimitType == CrossDomainMessageGasLimits.Deposit) {
            return SETTING_CROSS_DOMAIN_DEPOSIT_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Escrow) {
            return SETTING_CROSS_DOMAIN_ESCROW_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Reward) {
            return SETTING_CROSS_DOMAIN_REWARD_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Withdrawal) {
            return SETTING_CROSS_DOMAIN_WITHDRAWAL_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Relay) {
            return SETTING_CROSS_DOMAIN_RELAY_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.CloseFeePeriod) {
            return SETTING_CROSS_DOMAIN_FEE_PERIOD_CLOSE_GAS_LIMIT;
        } else {
            revert("Unknown gas limit type");
        }
    }

    function getCrossDomainMessageGasLimit(CrossDomainMessageGasLimits gasLimitType) internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, _getGasLimitSetting(gasLimitType));
    }

    function getTradingRewardsEnabled() internal view returns (bool) {
        return flexibleStorage().getBoolValue(SETTING_CONTRACT_NAME, SETTING_TRADING_REWARDS_ENABLED);
    }

    function getWaitingPeriodSecs() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_WAITING_PERIOD_SECS);
    }

    function getPriceDeviationThresholdFactor() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR);
    }

    function getIssuanceRatio() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ISSUANCE_RATIO);
    }

    function getFeePeriodDuration() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_FEE_PERIOD_DURATION);
    }

    function getTargetThreshold() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_TARGET_THRESHOLD);
    }

    function getLiquidationDelay() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_DELAY);
    }

    function getLiquidationRatio() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_RATIO);
    }

    function getLiquidationEscrowDuration() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_ESCROW_DURATION);
    }

    function getLiquidationPenalty() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_PENALTY);
    }

    function getSnxLiquidationPenalty() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_SNX_LIQUIDATION_PENALTY);
    }

    function getSelfLiquidationPenalty() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_SELF_LIQUIDATION_PENALTY);
    }

    function getFlagReward() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_FLAG_REWARD);
    }

    function getLiquidateReward() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATE_REWARD);
    }

    function getRateStalePeriod() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_RATE_STALE_PERIOD);
    }

    /* ========== Exchange Related Fees ========== */
    function getExchangeFeeRate(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_EXCHANGE_FEE_RATE, currencyKey))
            );
    }

    /// @notice Get exchange dynamic fee related keys
    /// @return threshold, weight decay, rounds, and max fee
    function getExchangeDynamicFeeConfig() internal view returns (DynamicFeeConfig memory) {
        bytes32[] memory keys = new bytes32[](4);
        keys[0] = SETTING_EXCHANGE_DYNAMIC_FEE_THRESHOLD;
        keys[1] = SETTING_EXCHANGE_DYNAMIC_FEE_WEIGHT_DECAY;
        keys[2] = SETTING_EXCHANGE_DYNAMIC_FEE_ROUNDS;
        keys[3] = SETTING_EXCHANGE_MAX_DYNAMIC_FEE;
        uint[] memory values = flexibleStorage().getUIntValues(SETTING_CONTRACT_NAME, keys);
        return DynamicFeeConfig({threshold: values[0], weightDecay: values[1], rounds: values[2], maxFee: values[3]});
    }

    /* ========== End Exchange Related Fees ========== */

    function getMinimumStakeTime() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_MINIMUM_STAKE_TIME);
    }

    function getAggregatorWarningFlags() internal view returns (address) {
        return flexibleStorage().getAddressValue(SETTING_CONTRACT_NAME, SETTING_AGGREGATOR_WARNING_FLAGS);
    }

    function getDebtSnapshotStaleTime() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_DEBT_SNAPSHOT_STALE_TIME);
    }

    function getEtherWrapperMaxETH() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_MAX_ETH);
    }

    function getEtherWrapperMintFeeRate() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_MINT_FEE_RATE);
    }

    function getEtherWrapperBurnFeeRate() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_BURN_FEE_RATE);
    }

    function getWrapperMaxTokenAmount(address wrapper) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_WRAPPER_MAX_TOKEN_AMOUNT, wrapper))
            );
    }

    function getWrapperMintFeeRate(address wrapper) internal view returns (int) {
        return
            flexibleStorage().getIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_WRAPPER_MINT_FEE_RATE, wrapper))
            );
    }

    function getWrapperBurnFeeRate(address wrapper) internal view returns (int) {
        return
            flexibleStorage().getIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_WRAPPER_BURN_FEE_RATE, wrapper))
            );
    }

    function getInteractionDelay(address collateral) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_INTERACTION_DELAY, collateral))
            );
    }

    function getCollapseFeeRate(address collateral) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_COLLAPSE_FEE_RATE, collateral))
            );
    }

    function getAtomicMaxVolumePerBlock() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ATOMIC_MAX_VOLUME_PER_BLOCK);
    }

    function getAtomicTwapWindow() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ATOMIC_TWAP_WINDOW);
    }

    function getAtomicEquivalentForDexPricing(bytes32 currencyKey) internal view returns (address) {
        return
            flexibleStorage().getAddressValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_ATOMIC_EQUIVALENT_FOR_DEX_PRICING, currencyKey))
            );
    }

    function getAtomicExchangeFeeRate(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_ATOMIC_EXCHANGE_FEE_RATE, currencyKey))
            );
    }

    function getAtomicVolatilityConsiderationWindow(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW, currencyKey))
            );
    }

    function getAtomicVolatilityUpdateThreshold(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_ATOMIC_VOLATILITY_UPDATE_THRESHOLD, currencyKey))
            );
    }

    function getPureChainlinkPriceForAtomicSwapsEnabled(bytes32 currencyKey) internal view returns (bool) {
        return
            flexibleStorage().getBoolValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_PURE_CHAINLINK_PRICE_FOR_ATOMIC_SWAPS_ENABLED, currencyKey))
            );
    }

    function getCrossChainSynthTransferEnabled(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_CROSS_SYNTH_TRANSFER_ENABLED, currencyKey))
            );
    }

    function getExchangeMaxDynamicFee() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_MAX_DYNAMIC_FEE);
    }

    function getExchangeDynamicFeeRounds() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_ROUNDS);
    }

    function getExchangeDynamicFeeThreshold() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_THRESHOLD);
    }

    function getExchangeDynamicFeeWeightDecay() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_WEIGHT_DECAY);
    }
}


interface IDebtCache {
    // Views

    function cachedDebt() external view returns (uint);

    function cachedSynthDebt(bytes32 currencyKey) external view returns (uint);

    function cacheTimestamp() external view returns (uint);

    function cacheInvalid() external view returns (bool);

    function cacheStale() external view returns (bool);

    function isInitialized() external view returns (bool);

    function currentSynthDebts(bytes32[] calldata currencyKeys)
        external
        view
        returns (
            uint[] memory debtValues,
            uint futuresDebt,
            uint excludedDebt,
            bool anyRateIsInvalid
        );

    function cachedSynthDebts(bytes32[] calldata currencyKeys) external view returns (uint[] memory debtValues);

    function totalNonSnxBackedDebt() external view returns (uint excludedDebt, bool isInvalid);

    function currentDebt() external view returns (uint debt, bool anyRateIsInvalid);

    function cacheInfo()
        external
        view
        returns (
            uint debt,
            uint timestamp,
            bool isInvalid,
            bool isStale
        );

    function excludedIssuedDebts(bytes32[] calldata currencyKeys) external view returns (uint[] memory excludedDebts);

    // Mutative functions

    function updateCachedSynthDebts(bytes32[] calldata currencyKeys) external;

    function updateCachedSynthDebtWithRate(bytes32 currencyKey, uint currencyRate) external;

    function updateCachedSynthDebtsWithRates(bytes32[] calldata currencyKeys, uint[] calldata currencyRates) external;

    function updateDebtCacheValidity(bool currentlyInvalid) external;

    function purgeCachedSynthDebt(bytes32 currencyKey) external;

    function takeDebtSnapshot() external;

    function recordExcludedDebtChange(bytes32 currencyKey, int256 delta) external;

    function updateCachedsUSDDebt(int amount) external;

    function importExcludedIssuedDebts(IDebtCache prevDebtCache, IIssuer prevIssuer) external;
}


interface IVirtualSynth {
    // Views
    function balanceOfUnderlying(address account) external view returns (uint);

    function rate() external view returns (uint);

    function readyToSettle() external view returns (bool);

    function secsLeftInWaitingPeriod() external view returns (uint);

    function settled() external view returns (bool);

    function synth() external view returns (ISynth);

    // Mutative functions
    function settle(address account) external;
}


pragma experimental ABIEncoderV2;


// https://docs.synthetix.io/contracts/source/interfaces/iexchanger
interface IExchanger {
    struct ExchangeEntrySettlement {
        bytes32 src;
        uint amount;
        bytes32 dest;
        uint reclaim;
        uint rebate;
        uint srcRoundIdAtPeriodEnd;
        uint destRoundIdAtPeriodEnd;
        uint timestamp;
    }

    struct ExchangeEntry {
        uint sourceRate;
        uint destinationRate;
        uint destinationAmount;
        uint exchangeFeeRate;
        uint exchangeDynamicFeeRate;
        uint roundIdForSrc;
        uint roundIdForDest;
        uint sourceAmountAfterSettlement;
    }

    // Views
    function calculateAmountAfterSettlement(
        address from,
        bytes32 currencyKey,
        uint amount,
        uint refunded
    ) external view returns (uint amountAfterSettlement);

    function isSynthRateInvalid(bytes32 currencyKey) external view returns (bool);

    function maxSecsLeftInWaitingPeriod(address account, bytes32 currencyKey) external view returns (uint);

    function settlementOwing(address account, bytes32 currencyKey)
        external
        view
        returns (
            uint reclaimAmount,
            uint rebateAmount,
            uint numEntries
        );

    function hasWaitingPeriodOrSettlementOwing(address account, bytes32 currencyKey) external view returns (bool);

    function feeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view returns (uint);

    function dynamicFeeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey)
        external
        view
        returns (uint feeRate, bool tooVolatile);

    function getAmountsForExchange(
        uint sourceAmount,
        bytes32 sourceCurrencyKey,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint amountReceived,
            uint fee,
            uint exchangeFeeRate
        );

    function priceDeviationThresholdFactor() external view returns (uint);

    function waitingPeriodSecs() external view returns (uint);

    function lastExchangeRate(bytes32 currencyKey) external view returns (uint);

    // Mutative functions
    function exchange(
        address exchangeForAddress,
        address from,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address destinationAddress,
        bool virtualSynth,
        address rewardAddress,
        bytes32 trackingCode
    ) external returns (uint amountReceived, IVirtualSynth vSynth);

    function exchangeAtomically(
        address from,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address destinationAddress,
        bytes32 trackingCode,
        uint minAmount
    ) external returns (uint amountReceived);

    function settle(address from, bytes32 currencyKey)
        external
        returns (
            uint reclaimed,
            uint refunded,
            uint numEntries
        );
}

// Used to have strongly-typed access to internal mutative functions in Synthetix
interface ISynthetixInternal {
    function emitExchangeTracking(
        bytes32 trackingCode,
        bytes32 toCurrencyKey,
        uint256 toAmount,
        uint256 fee
    ) external;

    function emitSynthExchange(
        address account,
        bytes32 fromCurrencyKey,
        uint fromAmount,
        bytes32 toCurrencyKey,
        uint toAmount,
        address toAddress
    ) external;

    function emitAtomicSynthExchange(
        address account,
        bytes32 fromCurrencyKey,
        uint fromAmount,
        bytes32 toCurrencyKey,
        uint toAmount,
        address toAddress
    ) external;

    function emitExchangeReclaim(
        address account,
        bytes32 currencyKey,
        uint amount
    ) external;

    function emitExchangeRebate(
        address account,
        bytes32 currencyKey,
        uint amount
    ) external;
}

interface IExchangerInternalDebtCache {
    function updateCachedSynthDebtsWithRates(bytes32[] calldata currencyKeys, uint[] calldata currencyRates) external;

    function updateCachedSynthDebts(bytes32[] calldata currencyKeys) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/IDirectIntegration
interface IDirectIntegrationManager {
    struct ParameterIntegrationSettings {
        bytes32 currencyKey;
        address dexPriceAggregator;
        address atomicEquivalentForDexPricing;
        uint atomicExchangeFeeRate;
        uint atomicTwapWindow;
        uint atomicMaxVolumePerBlock;
        uint atomicVolatilityConsiderationWindow;
        uint atomicVolatilityUpdateThreshold;
        uint exchangeFeeRate;
        uint exchangeMaxDynamicFee;
        uint exchangeDynamicFeeRounds;
        uint exchangeDynamicFeeThreshold;
        uint exchangeDynamicFeeWeightDecay;
    }

    function getExchangeParameters(address integration, bytes32 key)
        external
        view
        returns (ParameterIntegrationSettings memory settings);

    function setExchangeParameters(
        address integration,
        bytes32[] calldata currencyKeys,
        ParameterIntegrationSettings calldata params
    ) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/iexchangerates
interface IExchangeRates {
    // Structs
    struct RateAndUpdatedTime {
        uint216 rate;
        uint40 time;
    }

    // Views
    function aggregators(bytes32 currencyKey) external view returns (address);

    function aggregatorWarningFlags() external view returns (address);

    function anyRateIsInvalid(bytes32[] calldata currencyKeys) external view returns (bool);

    function anyRateIsInvalidAtRound(bytes32[] calldata currencyKeys, uint[] calldata roundIds) external view returns (bool);

    function currenciesUsingAggregator(address aggregator) external view returns (bytes32[] memory);

    function effectiveValue(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external view returns (uint value);

    function effectiveValueAndRates(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint value,
            uint sourceRate,
            uint destinationRate
        );

    function effectiveValueAndRatesAtRound(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        uint roundIdForSrc,
        uint roundIdForDest
    )
        external
        view
        returns (
            uint value,
            uint sourceRate,
            uint destinationRate
        );

    function effectiveAtomicValueAndRates(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint value,
            uint systemValue,
            uint systemSourceRate,
            uint systemDestinationRate
        );

    function effectiveAtomicValueAndRates(
        IDirectIntegrationManager.ParameterIntegrationSettings calldata sourceSettings,
        uint sourceAmount,
        IDirectIntegrationManager.ParameterIntegrationSettings calldata destinationSettings,
        IDirectIntegrationManager.ParameterIntegrationSettings calldata usdSettings
    )
        external
        view
        returns (
            uint value,
            uint systemValue,
            uint systemSourceRate,
            uint systemDestinationRate
        );

    function getCurrentRoundId(bytes32 currencyKey) external view returns (uint);

    function getLastRoundIdBeforeElapsedSecs(
        bytes32 currencyKey,
        uint startingRoundId,
        uint startingTimestamp,
        uint timediff
    ) external view returns (uint);

    function lastRateUpdateTimes(bytes32 currencyKey) external view returns (uint256);

    function rateAndTimestampAtRound(bytes32 currencyKey, uint roundId) external view returns (uint rate, uint time);

    function rateAndUpdatedTime(bytes32 currencyKey) external view returns (uint rate, uint time);

    function rateAndInvalid(bytes32 currencyKey) external view returns (uint rate, bool isInvalid);

    function rateForCurrency(bytes32 currencyKey) external view returns (uint);

    function rateIsFlagged(bytes32 currencyKey) external view returns (bool);

    function rateIsInvalid(bytes32 currencyKey) external view returns (bool);

    function rateIsStale(bytes32 currencyKey) external view returns (bool);

    function rateStalePeriod() external view returns (uint);

    function ratesAndUpdatedTimeForCurrencyLastNRounds(
        bytes32 currencyKey,
        uint numRounds,
        uint roundId
    ) external view returns (uint[] memory rates, uint[] memory times);

    function ratesAndInvalidForCurrencies(bytes32[] calldata currencyKeys)
        external
        view
        returns (uint[] memory rates, bool anyRateInvalid);

    function ratesForCurrencies(bytes32[] calldata currencyKeys) external view returns (uint[] memory);

    function synthTooVolatileForAtomicExchange(bytes32 currencyKey) external view returns (bool);

    function synthTooVolatileForAtomicExchange(IDirectIntegrationManager.ParameterIntegrationSettings calldata settings)
        external
        view
        returns (bool);

    function rateWithSafetyChecks(bytes32 currencyKey)
        external
        returns (
            uint rate,
            bool broken,
            bool invalid
        );
}


// https://docs.synthetix.io/contracts/source/interfaces/isystemstatus
interface ISystemStatus {
    struct Status {
        bool canSuspend;
        bool canResume;
    }

    struct Suspension {
        bool suspended;
        // reason is an integer code,
        // 0 => no reason, 1 => upgrading, 2+ => defined by system usage
        uint248 reason;
    }

    // Views
    function accessControl(bytes32 section, address account) external view returns (bool canSuspend, bool canResume);

    function requireSystemActive() external view;

    function systemSuspended() external view returns (bool);

    function requireIssuanceActive() external view;

    function requireExchangeActive() external view;

    function requireFuturesActive() external view;

    function requireFuturesMarketActive(bytes32 marketKey) external view;

    function requireExchangeBetweenSynthsAllowed(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;

    function requireSynthActive(bytes32 currencyKey) external view;

    function synthSuspended(bytes32 currencyKey) external view returns (bool);

    function requireSynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;

    function systemSuspension() external view returns (bool suspended, uint248 reason);

    function issuanceSuspension() external view returns (bool suspended, uint248 reason);

    function exchangeSuspension() external view returns (bool suspended, uint248 reason);

    function futuresSuspension() external view returns (bool suspended, uint248 reason);

    function synthExchangeSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason);

    function synthSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason);

    function futuresMarketSuspension(bytes32 marketKey) external view returns (bool suspended, uint248 reason);

    function getSynthExchangeSuspensions(bytes32[] calldata synths)
        external
        view
        returns (bool[] memory exchangeSuspensions, uint256[] memory reasons);

    function getSynthSuspensions(bytes32[] calldata synths)
        external
        view
        returns (bool[] memory suspensions, uint256[] memory reasons);

    function getFuturesMarketSuspensions(bytes32[] calldata marketKeys)
        external
        view
        returns (bool[] memory suspensions, uint256[] memory reasons);

    // Restricted functions
    function suspendIssuance(uint256 reason) external;

    function suspendSynth(bytes32 currencyKey, uint256 reason) external;

    function suspendFuturesMarket(bytes32 marketKey, uint256 reason) external;

    function updateAccessControl(
        bytes32 section,
        address account,
        bool canSuspend,
        bool canResume
    ) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/ierc20
interface IERC20 {
    // ERC20 Optional Views
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    // Views
    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(address owner, address spender) external view returns (uint);

    // Mutative functions
    function transfer(address to, uint value) external returns (bool);

    function approve(address spender, uint value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Events
    event Transfer(address indexed from, address indexed to, uint value);

    event Approval(address indexed owner, address indexed spender, uint value);
}


interface ICollateralManager {
    // Manager information
    function hasCollateral(address collateral) external view returns (bool);

    function isSynthManaged(bytes32 currencyKey) external view returns (bool);

    // State information
    function long(bytes32 synth) external view returns (uint amount);

    function short(bytes32 synth) external view returns (uint amount);

    function totalLong() external view returns (uint susdValue, bool anyRateIsInvalid);

    function totalShort() external view returns (uint susdValue, bool anyRateIsInvalid);

    function getBorrowRate() external view returns (uint borrowRate, bool anyRateIsInvalid);

    function getShortRate(bytes32 synth) external view returns (uint shortRate, bool rateIsInvalid);

    function getRatesAndTime(uint index)
        external
        view
        returns (
            uint entryRate,
            uint lastRate,
            uint lastUpdated,
            uint newIndex
        );

    function getShortRatesAndTime(bytes32 currency, uint index)
        external
        view
        returns (
            uint entryRate,
            uint lastRate,
            uint lastUpdated,
            uint newIndex
        );

    function exceedsDebtLimit(uint amount, bytes32 currency) external view returns (bool canIssue, bool anyRateIsInvalid);

    function areSynthsAndCurrenciesSet(bytes32[] calldata requiredSynthNamesInResolver, bytes32[] calldata synthKeys)
        external
        view
        returns (bool);

    function areShortableSynthsSet(bytes32[] calldata requiredSynthNamesInResolver, bytes32[] calldata synthKeys)
        external
        view
        returns (bool);

    // Loans
    function getNewLoanId() external returns (uint id);

    // Manager mutative
    function addCollaterals(address[] calldata collaterals) external;

    function removeCollaterals(address[] calldata collaterals) external;

    function addSynths(bytes32[] calldata synthNamesInResolver, bytes32[] calldata synthKeys) external;

    function removeSynths(bytes32[] calldata synths, bytes32[] calldata synthKeys) external;

    function addShortableSynths(bytes32[] calldata requiredSynthNamesInResolver, bytes32[] calldata synthKeys) external;

    function removeShortableSynths(bytes32[] calldata synths) external;

    // State mutative

    function incrementLongs(bytes32 synth, uint amount) external;

    function decrementLongs(bytes32 synth, uint amount) external;

    function incrementShorts(bytes32 synth, uint amount) external;

    function decrementShorts(bytes32 synth, uint amount) external;

    function accrueInterest(
        uint interestIndex,
        bytes32 currency,
        bool isShort
    ) external returns (uint difference, uint index);

    function updateBorrowRatesCollateral(uint rate) external;

    function updateShortRatesCollateral(bytes32 currency, uint rate) external;
}


interface IWETH {
    // ERC20 Optional Views
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    // Views
    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(address owner, address spender) external view returns (uint);

    // Mutative functions
    function transfer(address to, uint value) external returns (bool);

    function approve(address spender, uint value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // WETH-specific functions.
    function deposit() external payable;

    function withdraw(uint amount) external;

    // Events
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
    event Deposit(address indexed to, uint amount);
    event Withdrawal(address indexed to, uint amount);
}


// https://docs.synthetix.io/contracts/source/interfaces/ietherwrapper
contract IEtherWrapper {
    function mint(uint amount) external;

    function burn(uint amount) external;

    function distributeFees() external;

    function capacity() external view returns (uint);

    function getReserves() external view returns (uint);

    function totalIssuedSynths() external view returns (uint);

    function calculateMintFee(uint amount) public view returns (uint);

    function calculateBurnFee(uint amount) public view returns (uint);

    function maxETH() public view returns (uint256);

    function mintFeeRate() public view returns (uint256);

    function burnFeeRate() public view returns (uint256);

    function weth() public view returns (IWETH);
}


// https://docs.synthetix.io/contracts/source/interfaces/iwrapperfactory
interface IWrapperFactory {
    function isWrapper(address possibleWrapper) external view returns (bool);

    function createWrapper(
        IERC20 token,
        bytes32 currencyKey,
        bytes32 synthContractName
    ) external returns (address);

    function distributeFees() external;
}


interface IFuturesMarketManager {
    function markets(uint index, uint pageSize) external view returns (address[] memory);

    function markets(
        uint index,
        uint pageSize,
        bool proxiedMarkets
    ) external view returns (address[] memory);

    function numMarkets() external view returns (uint);

    function numMarkets(bool proxiedMarkets) external view returns (uint);

    function allMarkets() external view returns (address[] memory);

    function allMarkets(bool proxiedMarkets) external view returns (address[] memory);

    function marketForKey(bytes32 marketKey) external view returns (address);

    function marketsForKeys(bytes32[] calldata marketKeys) external view returns (address[] memory);

    function totalDebt() external view returns (uint debt, bool isInvalid);

    function isEndorsed(address account) external view returns (bool);

    function allEndorsedAddresses() external view returns (address[] memory);

    function addEndorsedAddresses(address[] calldata addresses) external;

    function removeEndorsedAddresses(address[] calldata addresses) external;
}


interface IDynamicSynthRedeemer {
    function suspendRedemption() external;

    function resumeRedemption() external;

    // Rate applied to chainlink price for redemptions
    function getDiscountRate() external view returns (uint);

    function redeem(bytes32 currencyKey) external;

    function redeemAll(bytes32[] calldata currencyKeys) external;

    function redeemPartial(bytes32 currencyKey, uint amountOfSynth) external;
}


// Inheritance


// Libraries


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/debtcache
contract BaseDebtCache is Owned, MixinSystemSettings, IDebtCache {
    using SafeMath for uint;
    using SafeDecimalMath for uint;

    uint internal _cachedDebt;
    mapping(bytes32 => uint) internal _cachedSynthDebt;
    mapping(bytes32 => uint) internal _excludedIssuedDebt;
    uint internal _cacheTimestamp;
    bool internal _cacheInvalid = true;

    // flag to ensure importing excluded debt is invoked only once
    bool public isInitialized = false; // public to avoid needing an event

    /* ========== ENCODED NAMES ========== */

    bytes32 internal constant sUSD = "sUSD";
    bytes32 internal constant sETH = "sETH";

    /* ========== ADDRESS RESOLVER CONFIGURATION ========== */

    bytes32 private constant CONTRACT_ISSUER = "Issuer";
    bytes32 private constant CONTRACT_EXCHANGER = "Exchanger";
    bytes32 private constant CONTRACT_EXRATES = "ExchangeRates";
    bytes32 private constant CONTRACT_SYSTEMSTATUS = "SystemStatus";
    bytes32 private constant CONTRACT_COLLATERALMANAGER = "CollateralManager";
    bytes32 private constant CONTRACT_ETHER_WRAPPER = "EtherWrapper";
    bytes32 private constant CONTRACT_FUTURESMARKETMANAGER = "FuturesMarketManager";
    bytes32 private constant CONTRACT_WRAPPER_FACTORY = "WrapperFactory";
    bytes32 private constant CONTRACT_DYNAMICSYNTHREDEEMER = "DynamicSynthRedeemer";

    constructor(address _owner, address _resolver) public Owned(_owner) MixinSystemSettings(_resolver) {}

    /* ========== VIEWS ========== */

    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        bytes32[] memory existingAddresses = MixinSystemSettings.resolverAddressesRequired();
        bytes32[] memory newAddresses = new bytes32[](9);
        newAddresses[0] = CONTRACT_ISSUER;
        newAddresses[1] = CONTRACT_EXCHANGER;
        newAddresses[2] = CONTRACT_EXRATES;
        newAddresses[3] = CONTRACT_SYSTEMSTATUS;
        newAddresses[4] = CONTRACT_COLLATERALMANAGER;
        newAddresses[5] = CONTRACT_WRAPPER_FACTORY;
        newAddresses[6] = CONTRACT_ETHER_WRAPPER;
        newAddresses[7] = CONTRACT_FUTURESMARKETMANAGER;
        newAddresses[8] = CONTRACT_DYNAMICSYNTHREDEEMER;
        addresses = combineArrays(existingAddresses, newAddresses);
    }

    function issuer() internal view returns (IIssuer) {
        return IIssuer(requireAndGetAddress(CONTRACT_ISSUER));
    }

    function exchanger() internal view returns (IExchanger) {
        return IExchanger(requireAndGetAddress(CONTRACT_EXCHANGER));
    }

    function exchangeRates() internal view returns (IExchangeRates) {
        return IExchangeRates(requireAndGetAddress(CONTRACT_EXRATES));
    }

    function systemStatus() internal view returns (ISystemStatus) {
        return ISystemStatus(requireAndGetAddress(CONTRACT_SYSTEMSTATUS));
    }

    function collateralManager() internal view returns (ICollateralManager) {
        return ICollateralManager(requireAndGetAddress(CONTRACT_COLLATERALMANAGER));
    }

    function etherWrapper() internal view returns (IEtherWrapper) {
        return IEtherWrapper(requireAndGetAddress(CONTRACT_ETHER_WRAPPER));
    }

    function futuresMarketManager() internal view returns (IFuturesMarketManager) {
        return IFuturesMarketManager(requireAndGetAddress(CONTRACT_FUTURESMARKETMANAGER));
    }

    function wrapperFactory() internal view returns (IWrapperFactory) {
        return IWrapperFactory(requireAndGetAddress(CONTRACT_WRAPPER_FACTORY));
    }

    function dynamicSynthRedeemer() internal view returns (IDynamicSynthRedeemer) {
        return IDynamicSynthRedeemer(requireAndGetAddress(CONTRACT_DYNAMICSYNTHREDEEMER));
    }

    function debtSnapshotStaleTime() external view returns (uint) {
        return getDebtSnapshotStaleTime();
    }

    function cachedDebt() external view returns (uint) {
        return _cachedDebt;
    }

    function cachedSynthDebt(bytes32 currencyKey) external view returns (uint) {
        return _cachedSynthDebt[currencyKey];
    }

    function cacheTimestamp() external view returns (uint) {
        return _cacheTimestamp;
    }

    function cacheInvalid() external view returns (bool) {
        return _cacheInvalid;
    }

    function _cacheStale(uint timestamp) internal view returns (bool) {
        // Note a 0 timestamp means that the cache is uninitialised.
        // We'll keep the check explicitly in case the stale time is
        // ever set to something higher than the current unix time (e.g. to turn off staleness).
        return getDebtSnapshotStaleTime() < block.timestamp - timestamp || timestamp == 0;
    }

    function cacheStale() external view returns (bool) {
        return _cacheStale(_cacheTimestamp);
    }

    function _issuedSynthValues(bytes32[] memory currencyKeys, uint[] memory rates)
        internal
        view
        returns (uint[] memory values)
    {
        uint numValues = currencyKeys.length;
        values = new uint[](numValues);
        ISynth[] memory synths = issuer().getSynths(currencyKeys);
        uint discountRate = dynamicSynthRedeemer().getDiscountRate();

        for (uint i = 0; i < numValues; i++) {
            address synthAddress = address(synths[i]);
            require(synthAddress != address(0), "Synth does not exist");
            uint supply = IERC20(synthAddress).totalSupply();
            uint value = supply.multiplyDecimalRound(rates[i]);
            uint multiplier = (synths[i].currencyKey() != sUSD) ? discountRate : SafeDecimalMath.unit();
            values[i] = value.multiplyDecimalRound(multiplier);
        }

        return (values);
    }

    function _currentSynthDebts(bytes32[] memory currencyKeys)
        internal
        view
        returns (
            uint[] memory snxIssuedDebts,
            uint _futuresDebt,
            uint _excludedDebt,
            bool anyRateIsInvalid
        )
    {
        (uint[] memory rates, bool isInvalid) = exchangeRates().ratesAndInvalidForCurrencies(currencyKeys);
        uint[] memory values = _issuedSynthValues(currencyKeys, rates);
        (uint excludedDebt, bool isAnyNonSnxDebtRateInvalid) = _totalNonSnxBackedDebt(currencyKeys, rates, isInvalid);
        (uint futuresDebt, bool futuresDebtIsInvalid) = futuresMarketManager().totalDebt();

        return (values, futuresDebt, excludedDebt, isInvalid || futuresDebtIsInvalid || isAnyNonSnxDebtRateInvalid);
    }

    function currentSynthDebts(bytes32[] calldata currencyKeys)
        external
        view
        returns (
            uint[] memory debtValues,
            uint futuresDebt,
            uint excludedDebt,
            bool anyRateIsInvalid
        )
    {
        return _currentSynthDebts(currencyKeys);
    }

    function _cachedSynthDebts(bytes32[] memory currencyKeys) internal view returns (uint[] memory) {
        uint numKeys = currencyKeys.length;
        uint[] memory debts = new uint[](numKeys);
        for (uint i = 0; i < numKeys; i++) {
            debts[i] = _cachedSynthDebt[currencyKeys[i]];
        }
        return debts;
    }

    function cachedSynthDebts(bytes32[] calldata currencyKeys) external view returns (uint[] memory snxIssuedDebts) {
        return _cachedSynthDebts(currencyKeys);
    }

    function _excludedIssuedDebts(bytes32[] memory currencyKeys) internal view returns (uint[] memory) {
        uint numKeys = currencyKeys.length;
        uint[] memory debts = new uint[](numKeys);
        for (uint i = 0; i < numKeys; i++) {
            debts[i] = _excludedIssuedDebt[currencyKeys[i]];
        }
        return debts;
    }

    function excludedIssuedDebts(bytes32[] calldata currencyKeys) external view returns (uint[] memory excludedDebts) {
        return _excludedIssuedDebts(currencyKeys);
    }

    /// used when migrating to new DebtCache instance in order to import the excluded debt records
    /// If this method is not run after upgrading the contract, the debt will be
    /// incorrect w.r.t to wrapper factory assets until the values are imported from
    /// previous instance of the contract
    /// Also, in addition to this method it's possible to use recordExcludedDebtChange since
    /// it's accessible to owner in case additional adjustments are required
    function importExcludedIssuedDebts(IDebtCache prevDebtCache, IIssuer prevIssuer) external onlyOwner {
        // this can only be run once so that recorded debt deltas aren't accidentally
        // lost or double counted
        require(!isInitialized, "already initialized");
        isInitialized = true;

        // get the currency keys from **previous** issuer, in case current issuer
        // doesn't have all the synths at this point
        // warning: if a synth won't be added to the current issuer before the next upgrade of this contract,
        // its entry will be lost (because it won't be in the prevIssuer for next time).
        // if for some reason this is a problem, it should be possible to use recordExcludedDebtChange() to amend
        bytes32[] memory keys = prevIssuer.availableCurrencyKeys();

        require(keys.length > 0, "previous Issuer has no synths");

        // query for previous debt records
        uint[] memory debts = prevDebtCache.excludedIssuedDebts(keys);

        // store the values
        for (uint i = 0; i < keys.length; i++) {
            if (debts[i] > 0) {
                // adding the values instead of overwriting in case some deltas were recorded in this
                // contract already (e.g. if the upgrade was not atomic)
                _excludedIssuedDebt[keys[i]] = _excludedIssuedDebt[keys[i]].add(debts[i]);
            }
        }
    }

    // Returns the total sUSD debt backed by non-SNX collateral.
    function totalNonSnxBackedDebt() external view returns (uint excludedDebt, bool isInvalid) {
        bytes32[] memory currencyKeys = issuer().availableCurrencyKeys();
        (uint[] memory rates, bool ratesAreInvalid) = exchangeRates().ratesAndInvalidForCurrencies(currencyKeys);

        return _totalNonSnxBackedDebt(currencyKeys, rates, ratesAreInvalid);
    }

    function _totalNonSnxBackedDebt(
        bytes32[] memory currencyKeys,
        uint[] memory rates,
        bool ratesAreInvalid
    ) internal view returns (uint excludedDebt, bool isInvalid) {
        // Calculate excluded debt.
        // 1. MultiCollateral long debt + short debt.
        (uint longValue, bool anyTotalLongRateIsInvalid) = collateralManager().totalLong();
        (uint shortValue, bool anyTotalShortRateIsInvalid) = collateralManager().totalShort();
        isInvalid = ratesAreInvalid || anyTotalLongRateIsInvalid || anyTotalShortRateIsInvalid;
        excludedDebt = longValue.add(shortValue);

        // 2. EtherWrapper.
        // Subtract sETH and sUSD issued by EtherWrapper.
        excludedDebt = excludedDebt.add(etherWrapper().totalIssuedSynths());

        // 3. WrapperFactory.
        // Get the debt issued by the Wrappers.
        for (uint i = 0; i < currencyKeys.length; i++) {
            excludedDebt = excludedDebt.add(_excludedIssuedDebt[currencyKeys[i]].multiplyDecimalRound(rates[i]));
        }

        return (excludedDebt, isInvalid);
    }

    function _currentDebt() internal view returns (uint debt, bool anyRateIsInvalid) {
        bytes32[] memory currencyKeys = issuer().availableCurrencyKeys();
        (uint[] memory rates, bool isInvalid) = exchangeRates().ratesAndInvalidForCurrencies(currencyKeys);

        // Sum all issued synth values based on their supply.
        uint[] memory values = _issuedSynthValues(currencyKeys, rates);
        (uint excludedDebt, bool isAnyNonSnxDebtRateInvalid) = _totalNonSnxBackedDebt(currencyKeys, rates, isInvalid);

        uint numValues = values.length;
        uint total;
        for (uint i; i < numValues; i++) {
            total = total.add(values[i]);
        }

        // Add in the debt accounted for by futures
        (uint futuresDebt, bool futuresDebtIsInvalid) = futuresMarketManager().totalDebt();
        total = total.add(futuresDebt);

        // Ensure that if the excluded non-SNX debt exceeds SNX-backed debt, no overflow occurs
        total = total < excludedDebt ? 0 : total.sub(excludedDebt);

        return (total, isInvalid || futuresDebtIsInvalid || isAnyNonSnxDebtRateInvalid);
    }

    function currentDebt() external view returns (uint debt, bool anyRateIsInvalid) {
        return _currentDebt();
    }

    function cacheInfo()
        external
        view
        returns (
            uint debt,
            uint timestamp,
            bool isInvalid,
            bool isStale
        )
    {
        uint time = _cacheTimestamp;
        return (_cachedDebt, time, _cacheInvalid, _cacheStale(time));
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    // Stub out all mutative functions as no-ops;
    // since they do nothing, there are no restrictions

    function updateCachedSynthDebts(bytes32[] calldata currencyKeys) external {}

    function updateCachedSynthDebtWithRate(bytes32 currencyKey, uint currencyRate) external {}

    function updateCachedSynthDebtsWithRates(bytes32[] calldata currencyKeys, uint[] calldata currencyRates) external {}

    function updateDebtCacheValidity(bool currentlyInvalid) external {}

    function purgeCachedSynthDebt(bytes32 currencyKey) external {}

    function takeDebtSnapshot() external {}

    function recordExcludedDebtChange(bytes32 currencyKey, int256 delta) external {}

    function updateCachedsUSDDebt(int amount) external {}

    /* ========== MODIFIERS ========== */

    function _requireSystemActiveIfNotOwner() internal view {
        if (msg.sender != owner) {
            systemStatus().requireSystemActive();
        }
    }

    modifier requireSystemActiveIfNotOwner() {
        _requireSystemActiveIfNotOwner();
        _;
    }

    function _onlyIssuer() internal view {
        require(msg.sender == address(issuer()), "Sender is not Issuer");
    }

    modifier onlyIssuer() {
        _onlyIssuer();
        _;
    }

    function _onlyIssuerOrExchanger() internal view {
        require(msg.sender == address(issuer()) || msg.sender == address(exchanger()), "Sender is not Issuer or Exchanger");
    }

    modifier onlyIssuerOrExchanger() {
        _onlyIssuerOrExchanger();
        _;
    }

    function _onlyDebtIssuer() internal view {
        bool isWrapper = wrapperFactory().isWrapper(msg.sender);

        // owner included for debugging and fixing in emergency situation
        bool isOwner = msg.sender == owner;

        require(isOwner || isWrapper, "Only debt issuers may call this");
    }

    modifier onlyDebtIssuer() {
        _onlyDebtIssuer();
        _;
    }
}


// Libraries


// Inheritance


// https://docs.synthetix.io/contracts/source/contracts/debtcache
contract DebtCache is BaseDebtCache {
    using SafeDecimalMath for uint;

    bytes32 public constant CONTRACT_NAME = "DebtCache";

    constructor(address _owner, address _resolver) public BaseDebtCache(_owner, _resolver) {}

    bytes32 internal constant EXCLUDED_DEBT_KEY = "EXCLUDED_DEBT";
    bytes32 internal constant FUTURES_DEBT_KEY = "FUTURES_DEBT";

    /* ========== MUTATIVE FUNCTIONS ========== */

    // This function exists in case a synth is ever somehow removed without its snapshot being updated.
    function purgeCachedSynthDebt(bytes32 currencyKey) external onlyOwner {
        require(issuer().synths(currencyKey) == ISynth(0), "Synth exists");
        delete _cachedSynthDebt[currencyKey];
    }

    function takeDebtSnapshot() external requireSystemActiveIfNotOwner {
        bytes32[] memory currencyKeys = issuer().availableCurrencyKeys();
        (uint[] memory values, uint futuresDebt, uint excludedDebt, bool isInvalid) = _currentSynthDebts(currencyKeys);

        // The total SNX-backed debt is the debt of futures markets plus the debt of circulating synths.
        uint snxCollateralDebt = futuresDebt;
        _cachedSynthDebt[FUTURES_DEBT_KEY] = futuresDebt;
        uint numValues = values.length;
        for (uint i; i < numValues; i++) {
            uint value = values[i];
            snxCollateralDebt = snxCollateralDebt.add(value);
            _cachedSynthDebt[currencyKeys[i]] = value;
        }

        // Subtract out the excluded non-SNX backed debt from our total
        _cachedSynthDebt[EXCLUDED_DEBT_KEY] = excludedDebt;
        uint newDebt = snxCollateralDebt.floorsub(excludedDebt);
        _cachedDebt = newDebt;
        _cacheTimestamp = block.timestamp;
        emit DebtCacheUpdated(newDebt);
        emit DebtCacheSnapshotTaken(block.timestamp);

        // (in)validate the cache if necessary
        _updateDebtCacheValidity(isInvalid);
    }

    function updateCachedSynthDebts(bytes32[] calldata currencyKeys) external requireSystemActiveIfNotOwner {
        (uint[] memory rates, bool anyRateInvalid) = exchangeRates().ratesAndInvalidForCurrencies(currencyKeys);
        _updateCachedSynthDebtsWithRates(currencyKeys, rates, anyRateInvalid);
    }

    function updateCachedSynthDebtWithRate(bytes32 currencyKey, uint currencyRate) external onlyIssuer {
        bytes32[] memory synthKeyArray = new bytes32[](1);
        synthKeyArray[0] = currencyKey;
        uint[] memory synthRateArray = new uint[](1);
        synthRateArray[0] = currencyRate;
        _updateCachedSynthDebtsWithRates(synthKeyArray, synthRateArray, false);
    }

    function updateCachedSynthDebtsWithRates(bytes32[] calldata currencyKeys, uint[] calldata currencyRates)
        external
        onlyIssuerOrExchanger
    {
        _updateCachedSynthDebtsWithRates(currencyKeys, currencyRates, false);
    }

    function updateDebtCacheValidity(bool currentlyInvalid) external onlyIssuer {
        _updateDebtCacheValidity(currentlyInvalid);
    }

    function recordExcludedDebtChange(bytes32 currencyKey, int256 delta) external onlyDebtIssuer {
        int256 newExcludedDebt = int256(_excludedIssuedDebt[currencyKey]) + delta;

        require(newExcludedDebt >= 0, "Excluded debt cannot become negative");

        _excludedIssuedDebt[currencyKey] = uint(newExcludedDebt);
    }

    function updateCachedsUSDDebt(int amount) external onlyIssuer {
        uint delta = SafeDecimalMath.abs(amount);
        if (amount > 0) {
            _cachedSynthDebt[sUSD] = _cachedSynthDebt[sUSD].add(delta);
            _cachedDebt = _cachedDebt.add(delta);
        } else {
            _cachedSynthDebt[sUSD] = _cachedSynthDebt[sUSD].sub(delta);
            _cachedDebt = _cachedDebt.sub(delta);
        }

        emit DebtCacheUpdated(_cachedDebt);
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    function _updateDebtCacheValidity(bool currentlyInvalid) internal {
        if (_cacheInvalid != currentlyInvalid) {
            _cacheInvalid = currentlyInvalid;
            emit DebtCacheValidityChanged(currentlyInvalid);
        }
    }

    // Updated the global debt according to a rate/supply change in a subset of issued synths.
    function _updateCachedSynthDebtsWithRates(
        bytes32[] memory currencyKeys,
        uint[] memory currentRates,
        bool anyRateIsInvalid
    ) internal {
        uint numKeys = currencyKeys.length;
        require(numKeys == currentRates.length, "Input array lengths differ");

        // Compute the cached and current debt sum for the subset of synths provided.
        uint cachedSum;
        uint currentSum;
        uint[] memory currentValues = _issuedSynthValues(currencyKeys, currentRates);

        for (uint i = 0; i < numKeys; i++) {
            bytes32 key = currencyKeys[i];
            uint currentSynthDebt = currentValues[i];

            cachedSum = cachedSum.add(_cachedSynthDebt[key]);
            currentSum = currentSum.add(currentSynthDebt);

            _cachedSynthDebt[key] = currentSynthDebt;
        }

        // Apply the debt update.
        if (cachedSum != currentSum) {
            uint debt = _cachedDebt;
            // apply the delta between the cachedSum and currentSum
            // add currentSum before sub cachedSum to prevent overflow as cachedSum > debt for large amount of excluded debt
            debt = debt.add(currentSum).sub(cachedSum);
            _cachedDebt = debt;
            emit DebtCacheUpdated(debt);
        }

        // Invalidate the cache if necessary
        if (anyRateIsInvalid) {
            _updateDebtCacheValidity(anyRateIsInvalid);
        }
    }

    /* ========== EVENTS ========== */

    event DebtCacheUpdated(uint cachedDebt);
    event DebtCacheSnapshotTaken(uint timestamp);
    event DebtCacheValidityChanged(bool indexed isInvalid);
}

Contract ABI

[{"inputs":[{"internalType":"address","name":"_owner","type":"address"},{"internalType":"address","name":"_resolver","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"name","type":"bytes32"},{"indexed":false,"internalType":"address","name":"destination","type":"address"}],"name":"CacheUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"DebtCacheSnapshotTaken","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"cachedDebt","type":"uint256"}],"name":"DebtCacheUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bool","name":"isInvalid","type":"bool"}],"name":"DebtCacheValidityChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerNominated","type":"event"},{"constant":true,"inputs":[],"name":"CONTRACT_NAME","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"cacheInfo","outputs":[{"internalType":"uint256","name":"debt","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"bool","name":"isInvalid","type":"bool"},{"internalType":"bool","name":"isStale","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"cacheInvalid","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"cacheStale","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"cacheTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"cachedDebt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"cachedSynthDebt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32[]","name":"currencyKeys","type":"bytes32[]"}],"name":"cachedSynthDebts","outputs":[{"internalType":"uint256[]","name":"snxIssuedDebts","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"currentDebt","outputs":[{"internalType":"uint256","name":"debt","type":"uint256"},{"internalType":"bool","name":"anyRateIsInvalid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32[]","name":"currencyKeys","type":"bytes32[]"}],"name":"currentSynthDebts","outputs":[{"internalType":"uint256[]","name":"debtValues","type":"uint256[]"},{"internalType":"uint256","name":"futuresDebt","type":"uint256"},{"internalType":"uint256","name":"excludedDebt","type":"uint256"},{"internalType":"bool","name":"anyRateIsInvalid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"debtSnapshotStaleTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32[]","name":"currencyKeys","type":"bytes32[]"}],"name":"excludedIssuedDebts","outputs":[{"internalType":"uint256[]","name":"excludedDebts","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IDebtCache","name":"prevDebtCache","type":"address"},{"internalType":"contract IIssuer","name":"prevIssuer","type":"address"}],"name":"importExcludedIssuedDebts","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"isInitialized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isResolverCached","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"nominateNewOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"nominatedOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"purgeCachedSynthDebt","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"rebuildCache","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"currencyKey","type":"bytes32"},{"internalType":"int256","name":"delta","type":"int256"}],"name":"recordExcludedDebtChange","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"resolver","outputs":[{"internalType":"contract AddressResolver","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"resolverAddressesRequired","outputs":[{"internalType":"bytes32[]","name":"addresses","type":"bytes32[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"takeDebtSnapshot","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalNonSnxBackedDebt","outputs":[{"internalType":"uint256","name":"excludedDebt","type":"uint256"},{"internalType":"bool","name":"isInvalid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"currencyKey","type":"bytes32"},{"internalType":"uint256","name":"currencyRate","type":"uint256"}],"name":"updateCachedSynthDebtWithRate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32[]","name":"currencyKeys","type":"bytes32[]"}],"name":"updateCachedSynthDebts","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32[]","name":"currencyKeys","type":"bytes32[]"},{"internalType":"uint256[]","name":"currencyRates","type":"uint256[]"}],"name":"updateCachedSynthDebtsWithRates","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"int256","name":"amount","type":"int256"}],"name":"updateCachedsUSDDebt","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bool","name":"currentlyInvalid","type":"bool"}],"name":"updateDebtCacheValidity","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000048914229dedd5a9922f44441ffccfc2cb7856ee9000000000000000000000000529c553ef2d0370279dc8abf19702b98b166d252

-----Decoded View---------------
Arg [0] : _owner (address): 0x48914229deDd5A9922f44441ffCCfC2Cb7856Ee9
Arg [1] : _resolver (address): 0x529C553eF2d0370279DC8AbF19702B98b166D252

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000048914229dedd5a9922f44441ffccfc2cb7856ee9
Arg [1] : 000000000000000000000000529c553ef2d0370279dc8abf19702b98b166d252


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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.