Contract Library is the blockchain sleuth's favorite tool chest, allowing developers to easily debug, monitor, query, and analyze any deployed smart contract and its actions.

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_router

addRouter

_amount

_tokenDiv

_tokenMul

adjustForDecimals

allWhitelistedTokens

allWhitelistedTokensLength

approvedRouters

bufferAmounts

_token

_receiver

buyUSDG

clearTokenConfig

cumulativeFundingRates

_account

_collateralToken

_indexToken

_collateralDelta

_sizeDelta

_isLong

decreasePosition

directPoolDeposit

errorController

feeReserves

fundingInterval

fundingRateFactor

getMaxPrice

getMinPrice

_size

_averagePrice

_nextPrice

_lastIncreasedTime

getNextAveragePrice

getNextFundingRate

getNextGlobalShortAveragePrice

getPosition

getPositionKey

_usdgAmount

getRedemptionAmount

globalShortAveragePrices

globalShortSizes

guaranteedUsd

hasDynamicFees

inManagerMode

inPrivateLiquidationMode

increasePosition

initialize

_usdg

_priceFeed

_liquidationFeeUsd

_fundingRateFactor

_stableFundingRateFactor

initializeConfig

isInitialized

isLeverageEnabled

isLiquidator

isManager

isSwapEnabled

lastFundingTimes

_feeReceiver

signedQuoteData

liquidatePosition

liquidationFeeUsd

marginFeeBasisPoints

maxGasPrice

maxGlobalShortSizes

maxLeverage

maxUsdgAmounts

minProfitBasisPoints

minProfitTime

mintBurnFeeBasisPoints

poolAmounts

positions

size

collateral

averagePrice

entryFundingRate

reserveAmount

realisedPnl

lastIncreasedTime

priceFeed

removeRouter

reservedAmounts

router

sellUSDG

setBufferAmount

_errorCode

_error

setError

_errorController

setErrorController

_taxBasisPoints

_stableTaxBasisPoints

_mintBurnFeeBasisPoints

_swapFeeBasisPoints

_stableSwapFeeBasisPoints

_marginFeeBasisPoints

_minProfitTime

_hasDynamicFees

setFees

_fundingInterval

setFundingRate

_gov

setGov

_inManagerMode

setInManagerMode

_inPrivateLiquidationMode

setInPrivateLiquidationMode

_isLeverageEnabled

setIsLeverageEnabled

_isSwapEnabled

setIsSwapEnabled

_liquidator

_isActive

setLiquidator

_manager

_isManager

setManager

_maxGasPrice

setMaxGasPrice

setMaxGlobalShortSize

_maxLeverage

setMaxLeverage

setPriceFeed

_rebates

setRebates

setRouter

_tokenDecimals

_tokenWeight

_minProfitBps

_maxUsdgAmount

_isStable

_isShortable

setTokenConfig

setUsdgAmount

_vaultUtils

setVaultUtils

shortableTokens

stableFundingRateFactor

stableSwapFeeBasisPoints

stableTaxBasisPoints

stableTokens

_tokenIn

_tokenOut

swap

swapFeeBasisPoints

_rebateReceiver

swapWithRebateReceiver

taxBasisPoints

tokenBalances

tokenDecimals

_tokenAmount

tokenToUsdMin

tokenWeights

totalTokenWeights

updateCumulativeFundingRate

_newVault

upgradeVault

_usdAmount

_price

usdToToken

usdToTokenMax

usdToTokenMin

usdg

usdgAmounts

vaultUtils

whitelistedTokenCount

contracts/core/Vault.sol

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.6.12;

/// @title IRebates
/// @notice Interface for Rebates
interface IRebates {
    /// @dev sets whether {rebater} can allocate rebates
    /// @param rebater the address that can call rebates
    /// @param canRebate whether or not {rebater} can rebate
    function setCanInitiateRebate(address rebater, bool canRebate) external;

    /// @dev sets the address that handles actions
    /// @param action the id of the rebate action
    /// @param handler the address of the contract that handles {action}
    function setRebateHandler(bytes32 action, address handler) external;

    /// @dev allocates rebates based on an arbitrary action / params
    /// @param action the id of the rebate action
    /// @param params the abi encoded parameters to pass to the handler
    function initiateRebate(bytes32 action, bytes calldata params) external;

    /// @dev creates a rebate of {amount} of {token} to {rebateReceiver}.
    /// @param token the token to rebate to {rebateReceiver}
    /// @param amount the amount of {token} to rebate to {rebateReceiver}
    /// @param rebateReceiver the receiver of the rebate
    /// @param action the action corresponding to this rebate
    function registerRebate(
        address rebateReceiver,
        address token,
        uint256 amount,
        bytes32 action
    ) external;

    /// @dev withdraws rebates of {token} to msg.sender
    /// @param token the token to claim rebates for
    function claim(address token) external;

    /// @dev withdraws rebates of {token} to {receiver}
    /// @param token the token to claim rebates for
    /// @param receiver the receiver of the rebate
    function claimFor(address token, address receiver) external;
}


contracts/rebates/IRebates.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "./IVaultUtils.sol";

interface IVault {
    function isInitialized() external view returns (bool);

    function isSwapEnabled() external view returns (bool);

    function isLeverageEnabled() external view returns (bool);

    function setVaultUtils(IVaultUtils _vaultUtils) external;

    function setError(uint256 _errorCode, string calldata _error) external;

    function router() external view returns (address);

    function usdg() external view returns (address);

    function gov() external view returns (address);

    function whitelistedTokenCount() external view returns (uint256);

    function maxLeverage() external view returns (uint256);

    function minProfitTime() external view returns (uint256);

    function hasDynamicFees() external view returns (bool);

    function fundingInterval() external view returns (uint256);

    function totalTokenWeights() external view returns (uint256);

    function inManagerMode() external view returns (bool);

    function inPrivateLiquidationMode() external view returns (bool);

    function maxGasPrice() external view returns (uint256);

    function approvedRouters(address _account, address _router)
        external
        view
        returns (bool);

    function isLiquidator(address _account) external view returns (bool);

    function isManager(address _account) external view returns (bool);

    function minProfitBasisPoints(address _token)
        external
        view
        returns (uint256);

    function tokenBalances(address _token) external view returns (uint256);

    function lastFundingTimes(address _token) external view returns (uint256);

    function setMaxLeverage(uint256 _maxLeverage) external;

    function setInManagerMode(bool _inManagerMode) external;

    function setManager(address _manager, bool _isManager) external;

    function setIsSwapEnabled(bool _isSwapEnabled) external;

    function setIsLeverageEnabled(bool _isLeverageEnabled) external;

    function setMaxGasPrice(uint256 _maxGasPrice) external;

    function setUsdgAmount(address _token, uint256 _amount) external;

    function setBufferAmount(address _token, uint256 _amount) external;

    function setMaxGlobalShortSize(address _token, uint256 _amount) external;

    function setInPrivateLiquidationMode(bool _inPrivateLiquidationMode)
        external;

    function setLiquidator(address _liquidator, bool _isActive) external;

    function setFundingRate(
        uint256 _fundingInterval,
        uint256 _fundingRateFactor,
        uint256 _stableFundingRateFactor
    ) external;

    function setFees(
        uint256 _taxBasisPoints,
        uint256 _stableTaxBasisPoints,
        uint256 _mintBurnFeeBasisPoints,
        uint256 _swapFeeBasisPoints,
        uint256 _stableSwapFeeBasisPoints,
        uint256 _marginFeeBasisPoints,
        uint256 _liquidationFeeUsd,
        uint256 _minProfitTime,
        bool _hasDynamicFees
    ) external;

    function setTokenConfig(
        address _token,
        uint256 _tokenDecimals,
        uint256 _redemptionBps,
        uint256 _minProfitBps,
        uint256 _maxUsdgAmount,
        bool _isStable,
        bool _isShortable
    ) external;

    function setPriceFeed(address _priceFeed) external;

    function withdrawFees(address _token, address _receiver)
        external
        returns (uint256);

    function directPoolDeposit(address _token) external;

    function buyUSDG(address _token, address _receiver)
        external
        returns (uint256);

    function sellUSDG(address _token, address _receiver)
        external
        returns (uint256);

    function swap(
        address _tokenIn,
        address _tokenOut,
        address _receiver
    ) external returns (uint256);

    function swapWithRebateReceiver(
        address _tokenIn,
        address _tokenOut,
        address _receiver,
        address rebateReceiver
    ) external returns (uint256);

    function increasePosition(
        address _account,
        address _collateralToken,
        address _indexToken,
        uint256 _sizeDelta,
        bool _isLong
    ) external;

    function decreasePosition(
        address _account,
        address _collateralToken,
        address _indexToken,
        uint256 _collateralDelta,
        uint256 _sizeDelta,
        bool _isLong,
        address _receiver
    ) external returns (uint256);

    function tokenToUsdMin(address _token, uint256 _tokenAmount)
        external
        view
        returns (uint256);

    function priceFeed() external view returns (address);

    function fundingRateFactor() external view returns (uint256);

    function stableFundingRateFactor() external view returns (uint256);

    function cumulativeFundingRates(address _token)
        external
        view
        returns (uint256);

    function getNextFundingRate(address _token) external view returns (uint256);

    function liquidationFeeUsd() external view returns (uint256);

    function taxBasisPoints() external view returns (uint256);

    function stableTaxBasisPoints() external view returns (uint256);

    function mintBurnFeeBasisPoints() external view returns (uint256);

    function swapFeeBasisPoints() external view returns (uint256);

    function stableSwapFeeBasisPoints() external view returns (uint256);

    function marginFeeBasisPoints() external view returns (uint256);

    function allWhitelistedTokensLength() external view returns (uint256);

    function allWhitelistedTokens(uint256) external view returns (address);

    function whitelistedTokens(address _token) external view returns (bool);

    function stableTokens(address _token) external view returns (bool);

    function shortableTokens(address _token) external view returns (bool);

    function feeReserves(address _token) external view returns (uint256);

    function globalShortSizes(address _token) external view returns (uint256);

    function globalShortAveragePrices(address _token)
        external
        view
        returns (uint256);

    function maxGlobalShortSizes(address _token)
        external
        view
        returns (uint256);

    function tokenDecimals(address _token) external view returns (uint256);

    function tokenWeights(address _token) external view returns (uint256);

    function guaranteedUsd(address _token) external view returns (uint256);

    function poolAmounts(address _token) external view returns (uint256);

    function bufferAmounts(address _token) external view returns (uint256);

    function reservedAmounts(address _token) external view returns (uint256);

    function usdgAmounts(address _token) external view returns (uint256);

    function maxUsdgAmounts(address _token) external view returns (uint256);

    function getRedemptionAmount(address _token, uint256 _usdgAmount)
        external
        view
        returns (uint256);

    function getMaxPrice(address _token) external view returns (uint256);

    function getMinPrice(address _token) external view returns (uint256);

    function getPosition(
        address _account,
        address _collateralToken,
        address _indexToken,
        bool _isLong
    )
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256,
            bool,
            uint256
        );

    function vaultUtils() external view returns (IVaultUtils);

    function usdToTokenMax(address _token, uint256 _usdAmount)
        external
        view
        returns (uint256);

    function usdToTokenMin(address _token, uint256 _usdAmount)
        external
        view
        returns (uint256);

    function getPositionKey(
        address _account,
        address _collateralToken,
        address _indexToken,
        bool _isLong
    ) external pure returns (bytes32);
}


contracts/core/interfaces/IVault.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IUSDG {
    function addVault(address _vault) external;

    function removeVault(address _vault) external;

    function mint(address _account, uint256 _amount) external;

    function burn(address _account, uint256 _amount) external;
}


contracts/tokens/interfaces/IUSDG.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IVaultUtils {
    function updateCumulativeFundingRate(
        address _collateralToken,
        address _indexToken
    ) external returns (bool);

    function validateIncreasePosition(
        address _account,
        address _collateralToken,
        address _indexToken,
        uint256 _sizeDelta,
        bool _isLong
    ) external view;

    function validateDecreasePosition(
        address _account,
        address _collateralToken,
        address _indexToken,
        uint256 _collateralDelta,
        uint256 _sizeDelta,
        bool _isLong,
        address _receiver
    ) external view;

    function validateLiquidation(
        address _account,
        address _collateralToken,
        address _indexToken,
        bool _isLong,
        bool _raise
    ) external view returns (uint256, uint256);

    function getEntryFundingRate(
        address _collateralToken,
        address _indexToken,
        bool _isLong
    ) external view returns (uint256);

    function getPositionFee(
        address _account,
        address _collateralToken,
        address _indexToken,
        bool _isLong,
        uint256 _sizeDelta
    ) external view returns (uint256);

    function getFundingFee(
        address _account,
        address _collateralToken,
        address _indexToken,
        bool _isLong,
        uint256 _size,
        uint256 _entryFundingRate
    ) external view returns (uint256);

    function getBuyUsdgFeeBasisPoints(address _token, uint256 _usdgAmount)
        external
        view
        returns (uint256);

    function getSellUsdgFeeBasisPoints(address _token, uint256 _usdgAmount)
        external
        view
        returns (uint256);

    function getSwapFeeBasisPoints(
        address _tokenIn,
        address _tokenOut,
        uint256 _usdgAmount
    ) external view returns (uint256);

    function getFeeBasisPoints(
        address _token,
        uint256 _usdgDelta,
        uint256 _feeBasisPoints,
        uint256 _taxBasisPoints,
        bool _increment
    ) external view returns (uint256);

    function getDelta(
        address _indexToken,
        uint256 _size,
        uint256 _averagePrice,
        bool _isLong,
        uint256 _lastIncreasedTime
    ) external view returns (bool, uint256);

    function getTargetUsdgAmount(address _token)
        external
        view
        returns (uint256);
}


contracts/core/interfaces/IVaultUtils.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IVaultPriceFeed {
    function adjustmentBasisPoints(address _token)
        external
        view
        returns (uint256);

    function isAdjustmentAdditive(address _token) external view returns (bool);

    function setH2soQuoteLifetimeSeconds(uint256 value) external;

    function setAdjustment(
        address _token,
        bool _isAdditive,
        uint256 _adjustmentBps
    ) external;

    function setUseV2Pricing(bool _useV2Pricing) external;

    function setIsAmmEnabled(bool _isEnabled) external;

    function setIsSecondaryPriceEnabled(bool _isEnabled) external;

    function setSpreadBasisPoints(address _token, uint256 _spreadBasisPoints)
        external;

    function setSpreadThresholdBasisPoints(uint256 _spreadThresholdBasisPoints)
        external;

    function setFavorPrimaryPrice(bool _favorPrimaryPrice) external;

    function setPriceSampleSpace(uint256 _priceSampleSpace) external;

    function setMaxStrictPriceDeviation(uint256 _maxStrictPriceDeviation)
        external;

    function getPrice(
        address _token,
        bool _maximise,
        bool _includeAmmPrice,
        bool _useSwapPricing
    ) external view returns (uint256);

    function getAmmPrice(address _token) external view returns (uint256);

    function getPrimaryPrice(address _token, bool _maximise)
        external
        view
        returns (uint256);

    function setTokenConfig(
        address _token,
        address _priceFeed,
        uint256 _priceDecimals,
        bool _isStrictStable
    ) external;

    function h2sofaApplySignedQuote(bytes calldata signedQuoteData) external;
}


contracts/core/interfaces/IVaultPriceFeed.sol

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;


/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 * 
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 * 
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        // extcodesize checks the size of the code stored in an address, and
        // address returns the current address. Since the code is still not
        // deployed when running a constructor, any checks on its code size will
        // yield zero, making it an effective way to detect if a contract is
        // under construction or not.
        address self = address(this);
        uint256 cs;
        // solhint-disable-next-line no-inline-assembly
        assembly { cs := extcodesize(self) }
        return cs == 0;
    }
}


@openzeppelin/contracts-upgradeable/proxy/Initializable.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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 SafeMathUpgradeable {
    /**
     * @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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        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-contracts/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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}


@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20Upgradeable.sol";
import "../../math/SafeMathUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using SafeMathUpgradeable for uint256;
    using AddressUpgradeable for address;

    function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20Upgradeable token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


@openzeppelin/contracts-upgradeable/token/ERC20/SafeERC20Upgradeable.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    function __ReentrancyGuard_init() internal initializer {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal initializer {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
    uint256[49] private __gap;
}


@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol

__ANONYMOUS__

0x32133B143a10f7573344C7dD442481bb2299A083