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Contract

0x9693A3a9776ee66e40711AF59286453EC6bBD892

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Contract Source Code Verified (Exact Match)

Contract Name:
ExchangeSystem

Compiler Version
v0.8.15+commit.e14f2714

Optimization Enabled:
Yes with 999999 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at moonbeam.moonscan.io on 2022-08-23
*/

// SPDX-License-Identifier: MIT
pragma solidity =0.8.15;

// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

// OpenZeppelin Contracts (last updated v4.7.0) (proxy/utils/Initializable.sol)

// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(bool success, bytes memory returndata, string memory errorMessage)
        internal
        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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

/**
 * @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 proxied contracts do not make use of 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.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 * function initialize() initializer public {
 * __ERC20_init("MyToken", "MTK");
 * }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 * function initializeV2() reinitializer(2) public {
 * __ERC20Permit_init("MyToken");
 * }
 * }
 * ```
 *
 * 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 {ERC1967Proxy-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.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 * _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

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

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
}

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {}

    function __Context_init_unchained() internal onlyInitializing {}

    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) {
                return (false, 0);
            }
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) {
                return (false, 0);
            }
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // 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 (true, 0);
            }
            uint256 c = a * b;
            if (c / a != b) {
                return (false, 0);
            }
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) {
                return (false, 0);
            }
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) {
                return (false, 0);
            }
            return (true, a % b);
        }
    }

    /**
     * @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) {
        return a + b;
    }

    /**
     * @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 a - b;
    }

    /**
     * @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) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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 a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

interface IAsset {
    function keyName() external view returns (bytes32);

    function mint(address account, uint256 amount) external;

    function burn(address account, uint256 amount) external;

    function move(address from, address to, uint256 amount) external;
}

interface IAssetRegistry {
    function assetSymbolToAddresses(bytes32 key) external view returns (address value);

    function perpAddresses(bytes32 symbol) external view returns (address);

    function perpSymbols(address perpAddress) external view returns (bytes32);

    function isPerpAddressRegistered(address perpAddress) external view returns (bool);

    function totalAssetsInUsd() external view returns (uint256 rTotal);
}

interface IConfig {
    function getUint(bytes32 key) external view returns (uint256);
}

interface IOracleRouter {
    function getPrice(bytes32 currencyKey) external view returns (uint256);

    function exchange(bytes32 sourceKey, uint256 sourceAmount, bytes32 destKey) external view returns (uint256);
}

library SafeDecimalMath {
    uint8 internal constant decimals = 18;
    uint8 internal constant highPrecisionDecimals = 27;

    uint256 internal constant UNIT = 10 ** uint256(decimals);

    uint256 internal constant PRECISE_UNIT = 10 ** uint256(highPrecisionDecimals);
    uint256 private constant UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR = 10 ** uint256(highPrecisionDecimals - decimals);

    function unit() internal pure returns (uint256) {
        return UNIT;
    }

    function preciseUnit() internal pure returns (uint256) {
        return PRECISE_UNIT;
    }

    function multiplyDecimal(uint256 x, uint256 y) internal pure returns (uint256) {
        return x * y / UNIT;
    }

    function _multiplyDecimalRound(uint256 x, uint256 y, uint256 precisionUnit) private pure returns (uint256) {
        uint256 quotientTimesTen = x * y / (precisionUnit / 10);

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

        return quotientTimesTen / 10;
    }

    function multiplyDecimalRoundPrecise(uint256 x, uint256 y) internal pure returns (uint256) {
        return _multiplyDecimalRound(x, y, PRECISE_UNIT);
    }

    function multiplyDecimalRound(uint256 x, uint256 y) internal pure returns (uint256) {
        return _multiplyDecimalRound(x, y, UNIT);
    }

    function divideDecimal(uint256 x, uint256 y) internal pure returns (uint256) {
        return x * UNIT / y;
    }

    function _divideDecimalRound(uint256 x, uint256 y, uint256 precisionUnit) private pure returns (uint256) {
        uint256 resultTimesTen = x * (precisionUnit * 10) / y;

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

        return resultTimesTen / 10;
    }

    function divideDecimalRound(uint256 x, uint256 y) internal pure returns (uint256) {
        return _divideDecimalRound(x, y, UNIT);
    }

    function divideDecimalRoundPrecise(uint256 x, uint256 y) internal pure returns (uint256) {
        return _divideDecimalRound(x, y, PRECISE_UNIT);
    }

    function decimalToPreciseDecimal(uint256 i) internal pure returns (uint256) {
        return i * UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR;
    }

    function preciseDecimalToDecimal(uint256 i) internal pure returns (uint256) {
        uint256 quotientTimesTen = i / (UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR / 10);

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

        return quotientTimesTen / 10;
    }
}

contract ExchangeSystem is OwnableUpgradeable {
    using SafeDecimalMath for uint256;
    using SafeMathUpgradeable for uint256;

    event ExchangeAsset(
        address fromAddr,
        bytes32 sourceKey,
        uint256 sourceAmount,
        address destAddr,
        bytes32 destKey,
        uint256 destRecived,
        uint256 feeForPool,
        uint256 feeForFoundation
    );
    event FoundationFeeHolderChanged(address oldHolder, address newHolder);
    event ExitPositionOnlyChanged(bool oldValue, bool newValue);
    event PendingExchangeAdded(
        uint256 id, address fromAddr, address destAddr, uint256 fromAmount, bytes32 fromCurrency, bytes32 toCurrency
    );
    event PendingExchangeSettled(
        uint256 id, address settler, uint256 destRecived, uint256 feeForPool, uint256 feeForFoundation
    );
    event PendingExchangeReverted(uint256 id);
    event AssetExitPositionOnlyChanged(bytes32 asset, bool newValue);

    struct PendingExchangeEntry {
        uint64 id;
        uint64 timestamp;
        address fromAddr;
        address destAddr;
        uint256 fromAmount;
        bytes32 fromCurrency;
        bytes32 toCurrency;
    }

    IAssetRegistry mAssets;
    IOracleRouter mPrices;
    IConfig mConfig;
    address mRewardSys;
    address foundationFeeHolder;

    bool public exitPositionOnly;

    uint256 public lastPendingExchangeEntryId;
    mapping(uint256 => PendingExchangeEntry) public pendingExchangeEntries;

    mapping(bytes32 => bool) assetExitPositionOnly;

    bytes32 private constant CONFIG_FEE_SPLIT = "FoundationFeeSplit";
    bytes32 private constant CONFIG_TRADE_SETTLEMENT_DELAY = "TradeSettlementDelay";
    bytes32 private constant CONFIG_TRADE_REVERT_DELAY = "TradeRevertDelay";

    bytes32 private constant LUSD_KEY = "athUSD";

    function __ExchangeSystem_init(
        IAssetRegistry _mAssets,
        IOracleRouter _mPrices,
        IConfig _mConfig,
        address _mRewardSys
    )
        public
        initializer
    {
        __Ownable_init();

        require(address(_mAssets) != address(0), "ExchangeSystem: zero address");
        require(address(_mPrices) != address(0), "ExchangeSystem: zero address");
        require(address(_mConfig) != address(0), "ExchangeSystem: zero address");
        require(address(_mRewardSys) != address(0), "ExchangeSystem: zero address");

        mAssets = _mAssets;
        mPrices = _mPrices;
        mConfig = _mConfig;
        mRewardSys = _mRewardSys;
    }

    function setFoundationFeeHolder(address _foundationFeeHolder) public onlyOwner {
        require(_foundationFeeHolder != address(0), "ExchangeSystem: zero address");
        require(_foundationFeeHolder != foundationFeeHolder, "ExchangeSystem: foundation fee holder not changed");

        address oldHolder = foundationFeeHolder;
        foundationFeeHolder = _foundationFeeHolder;

        emit FoundationFeeHolderChanged(oldHolder, foundationFeeHolder);
    }

    function setExitPositionOnly(bool newValue) public onlyOwner {
        require(exitPositionOnly != newValue, "ExchangeSystem: value not changed");

        bool oldValue = exitPositionOnly;
        exitPositionOnly = newValue;

        emit ExitPositionOnlyChanged(oldValue, newValue);
    }

    function setAssetExitPositionOnly(bytes32 asset, bool newValue) public onlyOwner {
        require(assetExitPositionOnly[asset] != newValue, "LnExchangeSystem: value not changed");

        assetExitPositionOnly[asset] = newValue;

        emit AssetExitPositionOnlyChanged(asset, newValue);
    }

    function exchange(bytes32 sourceKey, uint256 sourceAmount, address destAddr, bytes32 destKey) external {
        return _exchange(msg.sender, sourceKey, sourceAmount, destAddr, destKey);
    }

    function settle(uint256 pendingExchangeEntryId) external {
        _settle(pendingExchangeEntryId, msg.sender);
    }

    function revert(uint256 pendingExchangeEntryId) external {
        _revert(pendingExchangeEntryId, msg.sender);
    }

    function _exchange(address fromAddr, bytes32 sourceKey, uint256 sourceAmount, address destAddr, bytes32 destKey)
        private
    {
        // The global flag forces everyone to trade into lUSD
        if (exitPositionOnly) {
            require(destKey == LUSD_KEY, "ExchangeSystem: can only exit position");
        }

        // The asset-specific flag only forbids entering (can sell into other assets)
        require(!assetExitPositionOnly[destKey], "LnExchangeSystem: can only exit position for this asset");

        // We don't need the return value here. It's just for preventing entering invalid trades
        getAssetByKey(destKey);

        IAsset source = getAssetByKey(sourceKey);

        // Only lock up the source amount here. Everything else will be performed in settlement.
        // The `move` method is a special variant of `transferForm` that doesn't require approval.
        source.move(fromAddr, address(this), sourceAmount);

        // Record the pending entry
        PendingExchangeEntry memory newPendingEntry = PendingExchangeEntry({
            id: uint64(++lastPendingExchangeEntryId),
            timestamp: uint64(block.timestamp),
            fromAddr: fromAddr,
            destAddr: destAddr,
            fromAmount: sourceAmount,
            fromCurrency: sourceKey,
            toCurrency: destKey
        });
        pendingExchangeEntries[uint256(newPendingEntry.id)] = newPendingEntry;

        // Emit event for off-chain indexing
        emit PendingExchangeAdded(newPendingEntry.id, fromAddr, destAddr, sourceAmount, sourceKey, destKey);
    }

    function _settle(uint256 pendingExchangeEntryId, address settler) private {
        PendingExchangeEntry memory exchangeEntry = pendingExchangeEntries[pendingExchangeEntryId];
        require(exchangeEntry.id > 0, "ExchangeSystem: pending entry not found");

        uint256 settlementDelay = mConfig.getUint(CONFIG_TRADE_SETTLEMENT_DELAY);
        uint256 revertDelay = mConfig.getUint(CONFIG_TRADE_REVERT_DELAY);
        require(settlementDelay > 0, "ExchangeSystem: settlement delay not set");
        require(revertDelay > 0, "ExchangeSystem: revert delay not set");
        require(
            block.timestamp >= exchangeEntry.timestamp + settlementDelay, "ExchangeSystem: settlement delay not passed"
        );
        require(
            block.timestamp <= exchangeEntry.timestamp + revertDelay, "ExchangeSystem: trade can only be reverted now"
        );

        IAsset source = getAssetByKey(exchangeEntry.fromCurrency);
        IAsset dest = getAssetByKey(exchangeEntry.toCurrency);
        uint256 destAmount =
            mPrices.exchange(exchangeEntry.fromCurrency, exchangeEntry.fromAmount, exchangeEntry.toCurrency);

        // This might cause a transaction to deadlock, but impact would be negligible
        require(destAmount > 0, "ExchangeSystem: zero dest amount");

        uint256 feeRate = mConfig.getUint(exchangeEntry.toCurrency);
        uint256 destRecived = destAmount.multiplyDecimal(SafeDecimalMath.unit().sub(feeRate));
        uint256 fee = destAmount.sub(destRecived);

        // Fee going into the pool, to be adjusted based on foundation split
        uint256 feeForPoolInUsd = mPrices.exchange(exchangeEntry.toCurrency, fee, LUSD_KEY);

        // Split the fee between pool and foundation when both holder and ratio are set
        uint256 foundationSplit;
        if (foundationFeeHolder == address(0)) {
            foundationSplit = 0;
        } else {
            uint256 splitRatio = mConfig.getUint(CONFIG_FEE_SPLIT);

            if (splitRatio == 0) {
                foundationSplit = 0;
            } else {
                foundationSplit = feeForPoolInUsd.multiplyDecimal(splitRatio);
                feeForPoolInUsd = feeForPoolInUsd.sub(foundationSplit);
            }
        }

        IAsset lusd = getAssetByKey(LUSD_KEY);

        if (feeForPoolInUsd > 0) {
            lusd.mint(mRewardSys, feeForPoolInUsd);
        }
        if (foundationSplit > 0) {
            lusd.mint(foundationFeeHolder, foundationSplit);
        }

        source.burn(address(this), exchangeEntry.fromAmount);
        dest.mint(exchangeEntry.destAddr, destRecived);

        delete pendingExchangeEntries[pendingExchangeEntryId];

        emit PendingExchangeSettled(exchangeEntry.id, settler, destRecived, feeForPoolInUsd, foundationSplit);
    }

    function _revert(uint256 pendingExchangeEntryId, address reverter) private {
        PendingExchangeEntry memory exchangeEntry = pendingExchangeEntries[pendingExchangeEntryId];
        require(exchangeEntry.id > 0, "ExchangeSystem: pending entry not found");

        uint256 revertDelay = mConfig.getUint(CONFIG_TRADE_REVERT_DELAY);
        require(revertDelay > 0, "ExchangeSystem: revert delay not set");
        require(block.timestamp > exchangeEntry.timestamp + revertDelay, "ExchangeSystem: revert delay not passed");

        IAsset source = getAssetByKey(exchangeEntry.fromCurrency);

        // Refund the amount locked
        source.move(address(this), exchangeEntry.fromAddr, exchangeEntry.fromAmount);

        delete pendingExchangeEntries[pendingExchangeEntryId];

        emit PendingExchangeReverted(exchangeEntry.id);
    }

    function getAssetByKey(bytes32 key) private view returns (IAsset asset) {
        address assetAddress = mAssets.assetSymbolToAddresses(key);
        require(assetAddress != address(0), "ExchangeSystem: asset no tfound");

        return IAsset(assetAddress);
    }
}

Contract Security Audit

Contract ABI

API
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IAssetRegistry","name":"_mAssets","type":"address"},{"internalType":"contract IOracleRouter","name":"_mPrices","type":"address"},{"internalType":"contract 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Swarm Source

ipfs://b62103c406ae9a79ff020549436b019377509cbbeb9321a4943efadcc531cc39

Block Transaction Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.