Contract 0x592c6A6419fB86BAD15926c840A9f9306f69f590

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;
pragma experimental ABIEncoderV2;

import "./KeeperWhitelist.sol";
import "./PoolCreatorV2.sol";

contract PoolCreator is PoolCreatorV2 {
    bool public override isUniverseSettled;
    uint256 public poolVersion;
    uint256 public guardianCount;
    mapping(address => bool) public guardians;

    event AddGuardian(address indexed account);
    event TransferGuardian(address indexed fromAccount, address indexed toAccount);
    event RenounceGuardian(address indexed account);
    event SetUniverseSettled();

    modifier onlyGuardian() {
        require(isGuardian(_msgSender()), "sender is not guardian");
        _;
    }

    function isGuardian(address account) public view returns (bool) {
        return guardians[account];
    }

    /**
     * @notice  Set the guardian who is able to set `isUniverseSettled` flag.
     */
    function addGuardian(address account) public onlyOwner {
        _addGuardian(account);
    }

    /**
     * @notice  Transfer guardian from sender to some account.
     */
    function transferGuardian(address toAccount) public onlyGuardian {
        require(toAccount != address(0), "guardian is zero address");
        require(!isGuardian(toAccount), "guardian is already set");
        address fromAccount = _msgSender();
        guardians[fromAccount] = false;
        guardians[toAccount] = true;
        emit TransferGuardian(fromAccount, toAccount);
    }

    /**
     * @notice  Renounce guardian.
     */
    function renounceGuardian() external onlyGuardian {
        address account = _msgSender();
        guardians[account] = false;
        guardianCount--;
        emit RenounceGuardian(account);
    }

    /**
     * @notice  Indicates the universe settle state. When called:
     *          - all the perpetual created by this poolCreator can be settled immediately;
     *          - all the trading method will be unavailable.
     */
    function setUniverseSettled() external onlyGuardian {
        require(!isUniverseSettled, "state is not changed");
        isUniverseSettled = true;
        emit SetUniverseSettled();
    }

    function _addGuardian(address account) internal {
        require(account != address(0), "guardian is zero address");
        require(!isGuardian(account), "guardian is already set");
        guardians[account] = true;
        guardianCount++;
        emit AddGuardian(account);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/EnumerableSetUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/Initializable.sol";

import "../interface/IKeeperWhitelist.sol";

import "../libraries/Utils.sol";

contract KeeperWhitelist is Initializable, OwnableUpgradeable, IKeeperWhitelist {
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.AddressSet;
    using Utils for EnumerableSetUpgradeable.AddressSet;

    EnumerableSetUpgradeable.AddressSet internal _keepers;

    event AddKeeperToWhitelist(address indexed keeper);
    event RemoveKeeperFromWhitelist(address indexed keeper);

    /**
     * @notice Add an address to keeper whitelist.
     */
    function addKeeper(address keeper) external virtual override onlyOwner {
        require(keeper != address(0), "account is zero-address");
        require(!isKeeper(keeper), "keeper is already in the whitelist");
        bool success = _keepers.add(keeper);
        require(success, "fail to add keeper");
        emit AddKeeperToWhitelist(keeper);
    }

    /**
     * @notice Remove an address from keeper whitelist.
     */
    function removeKeeper(address keeper) external virtual override onlyOwner {
        require(keeper != address(0), "account is zero-address");
        require(isKeeper(keeper), "keeper is not in the whitelist");
        bool success = _keepers.remove(keeper);
        require(success, "fail to remove keeper");
        emit RemoveKeeperFromWhitelist(keeper);
    }

    /**
     * @notice Check if an address is in keeper whitelist.
     */
    function isKeeper(address keeper) public view virtual override returns (bool) {
        return _keepers.contains(keeper);
    }

    /**
     * @notice  Get count of current keepers.
     * @return  Number of keepers.
     */
    function getKeeperCount() public view returns (uint256) {
        return _keepers.length();
    }

    /**
     * @notice  List all local keepers.
     * @param   begin   The begin index of keeper to retrieve.
     * @param   end     The end index of keeper, exclusive.
     * @return  result  An array of keeper addresses.
     */
    function listKeepers(uint256 begin, uint256 end)
        public
        view
        virtual
        returns (address[] memory)
    {
        return _keepers.toArray(begin, end);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;
pragma experimental ABIEncoderV2;

import "./KeeperWhitelist.sol";
import "./PoolCreatorV1.sol";

abstract contract PoolCreatorV2 is PoolCreatorV1, KeeperWhitelist {
    /**
     * @notice Owner of version control.
     */
    function owner() public view override(OwnableUpgradeable, PoolCreatorV1) returns (address) {
        return OwnableUpgradeable.owner();
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.sol";
/**
 * @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 initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSetUpgradeable {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT

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

import "../utils/AddressUpgradeable.sol";

/**
 * @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) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;

interface IKeeperWhitelist {
    /**
     * @notice Add an address to keeper whitelist.
     */
    function addKeeper(address keeper) external;

    /**
     * @notice Remove an address from keeper whitelist.
     */
    function removeKeeper(address keeper) external;

    /**
     * @notice Check if an address is in keeper whitelist.
     */
    function isKeeper(address keeper) external view returns (bool);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

import "@openzeppelin/contracts/utils/EnumerableSet.sol";
import "@openzeppelin/contracts-upgradeable/utils/EnumerableSetUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/math/SignedSafeMathUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol";

import "./SafeMathExt.sol";

library Utils {
    using SafeMathExt for int256;
    using SafeMathExt for uint256;
    using SafeMathUpgradeable for uint256;
    using SignedSafeMathUpgradeable for int256;
    using EnumerableSet for EnumerableSet.AddressSet;
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.AddressSet;
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.Bytes32Set;

    /*
     * @dev Check if two numbers have the same sign. Zero has the same sign with any number
     */
    function hasTheSameSign(int256 x, int256 y) internal pure returns (bool) {
        if (x == 0 || y == 0) {
            return true;
        }
        return (x ^ y) >> 255 == 0;
    }

    /**
     * @dev     Check if the trader has opened position in the trade.
     *          Example: 2, 1 => true; 2, -1 => false; -2, -3 => true
     * @param   amount  The position of the trader after the trade
     * @param   delta   The update position amount of the trader after the trade
     * @return  True if the trader has opened position in the trade
     */
    function hasOpenedPosition(int256 amount, int256 delta) internal pure returns (bool) {
        if (amount == 0) {
            return false;
        }
        return Utils.hasTheSameSign(amount, delta);
    }

    /*
     * @dev Split the delta to two numbers.
     *      Use for splitting the trading amount to the amount to close position and the amount to open position.
     *      Examples: 2, 1 => 0, 1; 2, -1 => -1, 0; 2, -3 => -2, -1
     */
    function splitAmount(int256 amount, int256 delta) internal pure returns (int256, int256) {
        if (Utils.hasTheSameSign(amount, delta)) {
            return (0, delta);
        } else if (amount.abs() >= delta.abs()) {
            return (delta, 0);
        } else {
            return (amount.neg(), amount.add(delta));
        }
    }

    /*
     * @dev Check if amount will be away from zero or cross zero if added the delta.
     *      Use for checking if trading amount will make trader open position.
     *      Example: 2, 1 => true; 2, -1 => false; 2, -3 => true
     */
    function isOpen(int256 amount, int256 delta) internal pure returns (bool) {
        return Utils.hasTheSameSign(amount, delta) || amount.abs() < delta.abs();
    }

    /*
     * @dev Get the id of the current chain
     */
    function chainID() internal pure returns (uint256 id) {
        assembly {
            id := chainid()
        }
    }

    // function toArray(
    //     EnumerableSet.AddressSet storage set,
    //     uint256 begin,
    //     uint256 end
    // ) internal view returns (address[] memory result) {
    //     require(end > begin, "begin should be lower than end");
    //     uint256 length = set.length();
    //     if (begin >= length) {
    //         return result;
    //     }
    //     uint256 safeEnd = end.min(length);
    //     result = new address[](safeEnd.sub(begin));
    //     for (uint256 i = begin; i < safeEnd; i++) {
    //         result[i.sub(begin)] = set.at(i);
    //     }
    //     return result;
    // }

    function toArray(
        EnumerableSetUpgradeable.AddressSet storage set,
        uint256 begin,
        uint256 end
    ) internal view returns (address[] memory result) {
        require(end > begin, "begin should be lower than end");
        uint256 length = set.length();
        if (begin >= length) {
            return result;
        }
        uint256 safeEnd = end.min(length);
        result = new address[](safeEnd.sub(begin));
        for (uint256 i = begin; i < safeEnd; i++) {
            result[i.sub(begin)] = set.at(i);
        }
        return result;
    }

    function toArray(
        EnumerableSetUpgradeable.Bytes32Set storage set,
        uint256 begin,
        uint256 end
    ) internal view returns (bytes32[] memory result) {
        require(end > begin, "begin should be lower than end");
        uint256 length = set.length();
        if (begin >= length) {
            return result;
        }
        uint256 safeEnd = end.min(length);
        result = new bytes32[](safeEnd.sub(begin));
        for (uint256 i = begin; i < safeEnd; i++) {
            result[i.sub(begin)] = set.at(i);
        }
        return result;
    }
}

// SPDX-License-Identifier: MIT

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

/*
 * @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 GSN 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 initializer {
        __Context_init_unchained();
    }

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

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
    uint256[50] private __gap;
}

// 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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @title SignedSafeMath
 * @dev Signed math operations with safety checks that revert on error.
 */
library SignedSafeMathUpgradeable {
    int256 constant private _INT256_MIN = -2**255;

    /**
     * @dev Returns the multiplication of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(int256 a, int256 b) internal pure returns (int256) {
        // 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;
        }

        require(!(a == -1 && b == _INT256_MIN), "SignedSafeMath: multiplication overflow");

        int256 c = a * b;
        require(c / a == b, "SignedSafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two signed 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(int256 a, int256 b) internal pure returns (int256) {
        require(b != 0, "SignedSafeMath: division by zero");
        require(!(b == -1 && a == _INT256_MIN), "SignedSafeMath: division overflow");

        int256 c = a / b;

        return c;
    }

    /**
     * @dev Returns the subtraction of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a - b;
        require((b >= 0 && c <= a) || (b < 0 && c > a), "SignedSafeMath: subtraction overflow");

        return c;
    }

    /**
     * @dev Returns the addition of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a), "SignedSafeMath: addition overflow");

        return c;
    }
}

// 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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        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) {
        // 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) {
        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) {
        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) {
        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");
        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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b > 0, "SafeMath: modulo by zero");
        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) {
        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.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        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) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

import "@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/math/SignedSafeMathUpgradeable.sol";

import "./Constant.sol";
import "./Utils.sol";

enum Round {
    CEIL,
    FLOOR
}

library SafeMathExt {
    using SafeMathUpgradeable for uint256;
    using SignedSafeMathUpgradeable for int256;

    /*
     * @dev Always half up for uint256
     */
    function wmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x.mul(y).add(Constant.UNSIGNED_ONE / 2) / Constant.UNSIGNED_ONE;
    }

    /*
     * @dev Always half up for uint256
     */
    function wdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x.mul(Constant.UNSIGNED_ONE).add(y / 2).div(y);
    }

    /*
     * @dev Always half up for uint256
     */
    function wfrac(
        uint256 x,
        uint256 y,
        uint256 z
    ) internal pure returns (uint256 r) {
        r = x.mul(y).add(z / 2).div(z);
    }

    /*
     * @dev Always half up if no rounding parameter
     */
    function wmul(int256 x, int256 y) internal pure returns (int256 z) {
        z = roundHalfUp(x.mul(y), Constant.SIGNED_ONE) / Constant.SIGNED_ONE;
    }

    /*
     * @dev Always half up if no rounding parameter
     */
    function wdiv(int256 x, int256 y) internal pure returns (int256 z) {
        if (y < 0) {
            y = neg(y);
            x = neg(x);
        }
        z = roundHalfUp(x.mul(Constant.SIGNED_ONE), y).div(y);
    }

    /*
     * @dev Always half up if no rounding parameter
     */
    function wfrac(
        int256 x,
        int256 y,
        int256 z
    ) internal pure returns (int256 r) {
        int256 t = x.mul(y);
        if (z < 0) {
            z = neg(z);
            t = neg(t);
        }
        r = roundHalfUp(t, z).div(z);
    }

    function wmul(
        int256 x,
        int256 y,
        Round round
    ) internal pure returns (int256 z) {
        z = div(x.mul(y), Constant.SIGNED_ONE, round);
    }

    function wdiv(
        int256 x,
        int256 y,
        Round round
    ) internal pure returns (int256 z) {
        z = div(x.mul(Constant.SIGNED_ONE), y, round);
    }

    function wfrac(
        int256 x,
        int256 y,
        int256 z,
        Round round
    ) internal pure returns (int256 r) {
        int256 t = x.mul(y);
        r = div(t, z, round);
    }

    function abs(int256 x) internal pure returns (int256) {
        return x >= 0 ? x : neg(x);
    }

    function neg(int256 a) internal pure returns (int256) {
        return SignedSafeMathUpgradeable.sub(int256(0), a);
    }

    /*
     * @dev ROUND_HALF_UP rule helper.
     *      You have to call roundHalfUp(x, y) / y to finish the rounding operation.
     *      0.5 ≈ 1, 0.4 ≈ 0, -0.5 ≈ -1, -0.4 ≈ 0
     */
    function roundHalfUp(int256 x, int256 y) internal pure returns (int256) {
        require(y > 0, "roundHalfUp only supports y > 0");
        if (x >= 0) {
            return x.add(y / 2);
        }
        return x.sub(y / 2);
    }

    /*
     * @dev Division, rounding ceil or rounding floor
     */
    function div(
        int256 x,
        int256 y,
        Round round
    ) internal pure returns (int256 divResult) {
        require(y != 0, "division by zero");
        divResult = x.div(y);
        if (x % y == 0) {
            return divResult;
        }
        bool isSameSign = Utils.hasTheSameSign(x, y);
        if (round == Round.CEIL && isSameSign) {
            divResult = divResult.add(1);
        }
        if (round == Round.FLOOR && !isSameSign) {
            divResult = divResult.sub(1);
        }
    }

    function max(int256 a, int256 b) internal pure returns (int256) {
        return a >= b ? a : b;
    }

    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

library Constant {
    address internal constant INVALID_ADDRESS = address(0);

    int256 internal constant SIGNED_ONE = 10**18;
    uint256 internal constant UNSIGNED_ONE = 10**18;

    uint256 internal constant PRIVILEGE_DEPOSIT = 0x1;
    uint256 internal constant PRIVILEGE_WITHDRAW = 0x2;
    uint256 internal constant PRIVILEGE_TRADE = 0x4;
    uint256 internal constant PRIVILEGE_LIQUIDATE = 0x8;
    uint256 internal constant PRIVILEGE_GUARD =
        PRIVILEGE_DEPOSIT | PRIVILEGE_WITHDRAW | PRIVILEGE_TRADE | PRIVILEGE_LIQUIDATE;
    // max number of uint256
    uint256 internal constant SET_ALL_PERPETUALS_TO_EMERGENCY_STATE =
        0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/Initializable.sol";
import "@openzeppelin/contracts/proxy/TransparentUpgradeableProxy.sol";
import "@openzeppelin/contracts/proxy/ProxyAdmin.sol";

import "../interface/IGovernor.sol";
import "../interface/ILiquidityPool.sol";
import "../interface/IProxyAdmin.sol";
import "../interface/IPoolCreator.sol";

import "./Tracer.sol";
import "./VersionControl.sol";
import "./Variables.sol";
import "./AccessControl.sol";

abstract contract PoolCreatorV1 is
    Initializable,
    Tracer,
    VersionControl,
    Variables,
    AccessControl,
    IPoolCreator
{
    using AddressUpgradeable for address;

    IProxyAdmin public override upgradeAdmin;

    event CreateLiquidityPool(
        bytes32 versionKey,
        address indexed liquidityPool,
        address indexed governor,
        address indexed operator,
        address shareToken, //  downward compatibility for offline infrastructure
        address collateral,
        uint256 collateralDecimals,
        bytes initData
    );
    event UpgradeLiquidityPool(
        bytes32 versionKey,
        address indexed liquidityPool,
        address indexed governor
    );

    function initialize(
        address symbolService,
        address globalVault,
        int256 globalVaultFeeRate
    ) external initializer {
        __Ownable_init();
        __Variables_init(symbolService, globalVault, globalVaultFeeRate);

        upgradeAdmin = IProxyAdmin(address(new ProxyAdmin()));
    }

    /**
     * @notice Owner of version control.
     */
    function owner() public view virtual override(VersionControl, Variables) returns (address) {
        return OwnableUpgradeable.owner();
    }

    /**
     * @notice  Create a liquidity pool with the latest version.
     *          The sender will be the operator of pool.
     *
     * @param   collateral              he collateral address of the liquidity pool.
     * @param   collateralDecimals      The collateral's decimals of the liquidity pool.
     * @param   nonce                   A random nonce to calculate the address of deployed contracts.
     * @param   initData                A bytes array contains data to initialize new created liquidity pool.
     * @return  liquidityPool           The address of the created liquidity pool.
     */
    function createLiquidityPool(
        address collateral,
        uint256 collateralDecimals,
        int256 nonce,
        bytes calldata initData
    ) external override returns (address liquidityPool, address governor) {
        (liquidityPool, governor) = _createLiquidityPoolWith(
            getLatestVersion(),
            collateral,
            collateralDecimals,
            nonce,
            initData
        );
    }

    // /**
    //  * @notice  Create a liquidity pool with the specific version. The operator will be the sender.
    //  *
    //  * @param   versionKey          The key of the version to create.
    //  * @param   collateral          The collateral address of the liquidity pool.
    //  * @param   collateralDecimals  The collateral's decimals of the liquidity pool.
    //  * @param   nonce               A random nonce to calculate the address of deployed contracts.
    //  * @param   initData            A bytes array contains data to initialize new created liquidity pool.
    //  * @return  liquidityPool       The address of the created liquidity pool.
    //  * @return  governor            The address of the created governor.
    //  */
    // function createLiquidityPoolWith(
    //     bytes32 versionKey,
    //     address collateral,
    //     uint256 collateralDecimals,
    //     int256 nonce,
    //     bytes memory initData
    // ) external override returns (address liquidityPool, address governor) {
    //     (liquidityPool, governor) = _createLiquidityPoolWith(
    //         versionKey,
    //         collateral,
    //         collateralDecimals,
    //         nonce,
    //         initData
    //     );
    // }

    /**
     * @notice  Upgrade a liquidity pool and governor pair then call a patch function on the upgraded contract (optional).
     *          This method checks the sender and forwards the request to ProxyAdmin to do upgrading.
     *
     * @param   targetVersionKey        The key of version to be upgrade up. The target version must be compatiable with
     *                                  current version.
     * @param   dataForLiquidityPool    The patch calldata for upgraded liquidity pool.
     * @param   dataForGovernor         The patch calldata of upgraded governor.
     */
    function upgradeToAndCall(
        bytes32 targetVersionKey,
        bytes memory dataForLiquidityPool,
        bytes memory dataForGovernor
    ) external override {
        (
            address liquidityPool,
            address governor,
            address liquidityPoolTemplate,
            address governorTemplate
        ) = _getUpgradeContext(targetVersionKey);

        if (dataForLiquidityPool.length > 0) {
            upgradeAdmin.upgradeAndCall(liquidityPool, liquidityPoolTemplate, dataForLiquidityPool);
        } else {
            upgradeAdmin.upgrade(liquidityPool, liquidityPoolTemplate);
        }
        if (dataForGovernor.length > 0) {
            upgradeAdmin.upgradeAndCall(governor, governorTemplate, dataForGovernor);
        } else {
            upgradeAdmin.upgrade(governor, governorTemplate);
        }
        _updateDeployedInstances(targetVersionKey, liquidityPool, governor);

        emit UpgradeLiquidityPool(targetVersionKey, liquidityPool, governor);
    }

    /**
     * @dev     Create a liquidity pool with the specific version. The operator will be the sender.
     *
     * @param   versionKey          The address of version
     * @param   collateral          The collateral address of the liquidity pool.
     * @param   collateralDecimals  The collateral's decimals of the liquidity pool.
     * @param   nonce               A random nonce to calculate the address of deployed contracts.
     * @param   initData            A bytes array contains data to initialize new created liquidity pool.
     * @return  liquidityPool       The address of the created liquidity pool.
     * @return  governor            The address of the created governor.
     */
    function _createLiquidityPoolWith(
        bytes32 versionKey,
        address collateral,
        uint256 collateralDecimals,
        int256 nonce,
        bytes memory initData
    ) internal returns (address liquidityPool, address governor) {
        require(isVersionKeyValid(versionKey), "invalid version");
        // initialize
        address operator = msg.sender;
        (address liquidityPoolTemplate, address governorTemplate, ) = getVersion(versionKey);
        bytes32 salt = keccak256(abi.encode(versionKey, collateral, initData, nonce));

        liquidityPool = _createUpgradeableProxy(liquidityPoolTemplate, salt);
        governor = _createUpgradeableProxy(governorTemplate, salt);

        ILiquidityPool(liquidityPool).initialize(
            operator,
            collateral,
            collateralDecimals,
            governor,
            initData
        );
        IGovernor(governor).initialize(
            "MCDEX Share Token",
            "STK",
            liquidityPool,
            liquidityPool,
            getMCBToken(),
            address(this)
        );
        // register pool to tracer
        _registerLiquidityPool(liquidityPool, operator);
        _updateDeployedInstances(versionKey, liquidityPool, governor);
        // [EVENT UPDATE]
        emit CreateLiquidityPool(
            versionKey,
            liquidityPool,
            governor,
            operator,
            governor,
            collateral,
            collateralDecimals,
            initData
        );
    }

    /**
     * @dev     Create an upgradeable proxy contract of the implementation of liquidity pool.
     *
     * @param   implementation The address of the implementation.
     * @param   salt        The random number for create2.
     * @return  instance    The address of the created upgradeable proxy contract.
     */
    function _createUpgradeableProxy(address implementation, bytes32 salt)
        internal
        returns (address instance)
    {
        require(implementation.isContract(), "implementation must be contract");
        bytes memory deploymentData = abi.encodePacked(
            type(TransparentUpgradeableProxy).creationCode,
            abi.encode(implementation, address(upgradeAdmin), "")
        );
        assembly {
            instance := create2(0x0, add(0x20, deploymentData), mload(deploymentData), salt)
        }
        require(instance != address(0), "create2 call failed");
    }

    /**
     * @dev Validate sender:
     *      - the transaction must be sent from a governor.
     *      - the sender governor and its liquidity pool must be already registered.
     *      - the target version must be compatible with the current version.
     */
    function _getUpgradeContext(bytes32 targetVersionKey)
        internal
        view
        returns (
            address liquidityPool,
            address governor,
            address liquidityPoolTemplate,
            address governorTemplate
        )
    {
        governor = _msgSender();
        require(governor.isContract(), "sender must be a contract");
        liquidityPool = IGovernor(governor).getTarget();
        require(isLiquidityPool(liquidityPool), "sender is not the governor of a registered pool");

        bytes32 deployedAddressHash = _getVersionHash(liquidityPool, governor);
        bytes32 baseVersionKey = _deployedVersions[deployedAddressHash];
        require(
            isVersionCompatible(targetVersionKey, baseVersionKey),
            "the target version is not compatible"
        );
        (liquidityPoolTemplate, governorTemplate, ) = getVersion(targetVersionKey);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./UpgradeableProxy.sol";

/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is UpgradeableProxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(address _logic, address admin_, bytes memory _data) public payable UpgradeableProxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _setAdmin(admin_);
    }

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }

    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _admin();
    }

    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        require(newAdmin != address(0), "TransparentUpgradeableProxy: new admin is the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external virtual ifAdmin {
        _upgradeTo(newImplementation);
    }

    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable virtual ifAdmin {
        _upgradeTo(newImplementation);
        Address.functionDelegateCall(newImplementation, data);
    }

    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address adm) {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adm := sload(slot)
        }
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        bytes32 slot = _ADMIN_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newAdmin)
        }
    }

    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../access/Ownable.sol";
import "./TransparentUpgradeableProxy.sol";

/**
 * @dev This is an auxiliary contract meant to be assigned as the admin of a {TransparentUpgradeableProxy}. For an
 * explanation of why you would want to use this see the documentation for {TransparentUpgradeableProxy}.
 */
contract ProxyAdmin is Ownable {

    /**
     * @dev Returns the current implementation of `proxy`.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function getProxyImplementation(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
        // We need to manually run the static call since the getter cannot be flagged as view
        // bytes4(keccak256("implementation()")) == 0x5c60da1b
        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"5c60da1b");
        require(success);
        return abi.decode(returndata, (address));
    }

    /**
     * @dev Returns the current admin of `proxy`.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function getProxyAdmin(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
        // We need to manually run the static call since the getter cannot be flagged as view
        // bytes4(keccak256("admin()")) == 0xf851a440
        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"f851a440");
        require(success);
        return abi.decode(returndata, (address));
    }

    /**
     * @dev Changes the admin of `proxy` to `newAdmin`.
     *
     * Requirements:
     *
     * - This contract must be the current admin of `proxy`.
     */
    function changeProxyAdmin(TransparentUpgradeableProxy proxy, address newAdmin) public virtual onlyOwner {
        proxy.changeAdmin(newAdmin);
    }

    /**
     * @dev Upgrades `proxy` to `implementation`. See {TransparentUpgradeableProxy-upgradeTo}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgrade(TransparentUpgradeableProxy proxy, address implementation) public virtual onlyOwner {
        proxy.upgradeTo(implementation);
    }

    /**
     * @dev Upgrades `proxy` to `implementation` and calls a function on the new implementation. See
     * {TransparentUpgradeableProxy-upgradeToAndCall}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgradeAndCall(TransparentUpgradeableProxy proxy, address implementation, bytes memory data) public payable virtual onlyOwner {
        proxy.upgradeToAndCall{value: msg.value}(implementation, data);
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IGovernor {
    function initialize(
        string memory name,
        string memory symbol,
        address minter,
        address target_,
        address rewardToken,
        address poolCreator
    ) external;

    function totalSupply() external view returns (uint256);

    function getTarget() external view returns (address);

    function mint(address account, uint256 amount) external;

    function burn(address account, uint256 amount) external;

    function balanceOf(address account) external view returns (uint256);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;
pragma experimental ABIEncoderV2;

import "../Type.sol";

interface ILiquidityPool {
    /**
     * @notice Initialize the liquidity pool and set up its configuration.
     *
     * @param operator              The operator's address of the liquidity pool.
     * @param collateral            The collateral's address of the liquidity pool.
     * @param collateralDecimals    The collateral's decimals of the liquidity pool.
     * @param governor              The governor's address of the liquidity pool.
     * @param initData              A bytes array contains data to initialize new created liquidity pool.
     */
    function initialize(
        address operator,
        address collateral,
        uint256 collateralDecimals,
        address governor,
        bytes calldata initData
    ) external;

    /**
     * @notice  Set the liquidity pool to running state. Can be call only once by operater.m n
     */
    function runLiquidityPool() external;

    /**
     * @notice  If you want to get the real-time data, call this function first
     */
    function forceToSyncState() external;

    /**
     * @notice  Add liquidity to the liquidity pool.
     *          Liquidity provider deposits collaterals then gets share tokens back.
     *          The ratio of added cash to share token is determined by current liquidity.
     *          Can only called when the pool is running.
     *
     * @param   cashToAdd   The amount of cash to add. always use decimals 18.
     */
    function addLiquidity(int256 cashToAdd) external;

    /**
     * @notice  Remove liquidity from the liquidity pool.
     *          Liquidity providers redeems share token then gets collateral back.
     *          The amount of collateral retrieved may differ from the amount when adding liquidity,
     *          The index price, trading fee and positions holding by amm will affect the profitability of providers.
     *          Can only called when the pool is running.
     *
     * @param   shareToRemove   The amount of share token to remove. The amount always use decimals 18.
     * @param   cashToReturn    The amount of cash(collateral) to return. The amount always use decimals 18.
     */
    function removeLiquidity(int256 shareToRemove, int256 cashToReturn) external;
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;

interface IProxyAdmin {
    function getProxyImplementation(address proxy) external view returns (address);

    /**
     * @dev Upgrades `proxy` to `implementation`. See {TransparentUpgradeableProxy-upgradeTo}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgrade(address proxy, address implementation) external;

    /**
     * @dev Upgrades `proxy` to `implementation` and calls a function on the new implementation. See
     * {TransparentUpgradeableProxy-upgradeToAndCall}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgradeAndCall(
        address proxy,
        address implementation,
        bytes memory data
    ) external payable;
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;

import "./IProxyAdmin.sol";

interface IPoolCreator {
    function upgradeAdmin() external view returns (IProxyAdmin proxyAdmin);

    /**
     * @notice  Create a liquidity pool with the latest version.
     *          The sender will be the operator of pool.
     *
     * @param   collateral              he collateral address of the liquidity pool.
     * @param   collateralDecimals      The collateral's decimals of the liquidity pool.
     * @param   nonce                   A random nonce to calculate the address of deployed contracts.
     * @param   initData                A bytes array contains data to initialize new created liquidity pool.
     * @return  liquidityPool           The address of the created liquidity pool.
     */
    function createLiquidityPool(
        address collateral,
        uint256 collateralDecimals,
        int256 nonce,
        bytes calldata initData
    ) external returns (address liquidityPool, address governor);

    /**
     * @notice  Upgrade a liquidity pool and governor pair then call a patch function on the upgraded contract (optional).
     *          This method checks the sender and forwards the request to ProxyAdmin to do upgrading.
     *
     * @param   targetVersionKey        The key of version to be upgrade up. The target version must be compatible with
     *                                  current version.
     * @param   dataForLiquidityPool    The patch calldata for upgraded liquidity pool.
     * @param   dataForGovernor         The patch calldata of upgraded governor.
     */
    function upgradeToAndCall(
        bytes32 targetVersionKey,
        bytes memory dataForLiquidityPool,
        bytes memory dataForGovernor
    ) external;

    /**
     * @notice  Indicates the universe settle state.
     *          If the flag set to true:
     *              - all the pereptual created by this poolCreator can be settled immediately;
     *              - all the trading method will be unavailable.
     */
    function isUniverseSettled() external view returns (bool);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/EnumerableSet.sol";

import "../libraries/SafeMathExt.sol";
import "../libraries/Utils.sol";

contract Tracer {
    using SafeMath for uint256;
    using SafeMathExt for uint256;
    using Utils for EnumerableSetUpgradeable.AddressSet;
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.AddressSet;
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.Bytes32Set;

    struct PerpetualUID {
        address liquidityPool;
        uint256 perpetualIndex;
    }

    // liquidity pool address[]
    EnumerableSetUpgradeable.AddressSet internal _liquidityPoolSet;
    // hash(puid) => PerpetualUID {}
    mapping(bytes32 => PerpetualUID) internal _perpetualUIDs;
    // trader => hash(puid) []
    mapping(address => EnumerableSetUpgradeable.Bytes32Set) internal _traderActiveLiquidityPools;
    // operator => address
    mapping(address => EnumerableSetUpgradeable.AddressSet) internal _operatorOwnedLiquidityPools;
    mapping(address => address) internal _liquidityPoolOwners;

    modifier onlyLiquidityPool() {
        require(isLiquidityPool(msg.sender), "caller is not liquidity pool instance");
        _;
    }

    // =========================== Liquidity Pool ===========================
    /**
     * @notice  Get the number of all liquidity pools.
     *
     * @return  uint256 The number of all liquidity pools
     */
    function getLiquidityPoolCount() public view returns (uint256) {
        return _liquidityPoolSet.length();
    }

    /**
     * @notice  Check if the liquidity pool exists.
     *
     * @param   liquidityPool   The address of the liquidity pool.
     * @return  True if the liquidity pool exists.
     */
    function isLiquidityPool(address liquidityPool) public view returns (bool) {
        return _liquidityPoolSet.contains(liquidityPool);
    }

    /**
     * @notice  Get the liquidity pools whose index between begin and end.
     *
     * @param   begin   The begin index.
     * @param   end     The end index.
     * @return  result  An array of liquidity pool addresses whose index between begin and end.
     */
    function listLiquidityPools(uint256 begin, uint256 end)
        public
        view
        returns (address[] memory result)
    {
        result = _liquidityPoolSet.toArray(begin, end);
    }

    /**
     * @notice  Get the number of the liquidity pools owned by the operator.
     *
     * @param   operator    The address of operator.
     * @return  uint256     The number of the liquidity pools owned by the operator.
     */
    function getOwnedLiquidityPoolsCountOf(address operator) public view returns (uint256) {
        return _operatorOwnedLiquidityPools[operator].length();
    }

    /**
     * @notice  Get the liquidity pools owned by the operator and whose index between begin and end.
     *
     * @param   operator    The address of the operator.
     * @param   begin       The begin index.
     * @param   end         The end index.
     * @return  result      The liquidity pools owned by the operator and whose index between begin and end.
     */
    function listLiquidityPoolOwnedBy(
        address operator,
        uint256 begin,
        uint256 end
    ) public view returns (address[] memory result) {
        return _operatorOwnedLiquidityPools[operator].toArray(begin, end);
    }

    /**
     * @notice  Liquidity pool must call this method when changing its ownership to the new operator.
     *          Can only be called by a liquidity pool. This method does not affect 'ownership' or privileges
     *          of operator but only make a record for further query.
     *
     * @param   liquidityPool   The address of the liquidity pool.
     * @param   operator        The address of the new operator, must be different from the old operator.
     */
    function registerOperatorOfLiquidityPool(address liquidityPool, address operator)
        public
        onlyLiquidityPool
    {
        address prevOperator = _liquidityPoolOwners[liquidityPool];
        _operatorOwnedLiquidityPools[prevOperator].remove(liquidityPool);
        _operatorOwnedLiquidityPools[operator].add(liquidityPool);
        _liquidityPoolOwners[liquidityPool] = operator;
    }

    /**
     * @dev     Record the liquidity pool, the liquidity pool should not be recorded before
     *
     * @param   liquidityPool   The address of the liquidity pool.
     * @param   operator        The address of operator.
     */
    function _registerLiquidityPool(address liquidityPool, address operator) internal {
        require(liquidityPool != address(0), "invalid liquidity pool address");
        bool success = _liquidityPoolSet.add(liquidityPool);
        require(success, "liquidity pool exists");
        _operatorOwnedLiquidityPools[operator].add(liquidityPool);
        _liquidityPoolOwners[liquidityPool] = operator;
    }

    // =========================== Active Liquidity Pool of Trader ===========================
    /**
     * @notice  Get the number of the trader's active liquidity pools. Active means the trader's account is
     *          not all empty in perpetuals of the liquidity pool. Empty means cash and position are zero.
     *
     * @param   trader  The address of the trader.
     * @return  Number of the trader's active liquidity pools.
     */
    function getActiveLiquidityPoolCountOf(address trader) public view returns (uint256) {
        return _traderActiveLiquidityPools[trader].length();
    }

    /**
     * @notice  Check if the perpetual is active for the trader. Active means the trader's account is
     *          not empty in the perpetual. Empty means cash and position are zero.
     *
     * @param   trader          The address of the trader.
     * @param   liquidityPool   The address of liquidity pool.
     * @param   perpetualIndex  The index of the perpetual in the liquidity pool.
     * @return  True if the perpetual is active for the trader.
     */
    function isActiveLiquidityPoolOf(
        address trader,
        address liquidityPool,
        uint256 perpetualIndex
    ) public view returns (bool) {
        return
            _traderActiveLiquidityPools[trader].contains(
                _getPerpetualKey(liquidityPool, perpetualIndex)
            );
    }

    /**
     * @notice Get the liquidity pools whose index between begin and end and active for the trader.
     *         Active means the trader's account is not all empty in perpetuals of the liquidity pool.
     *         Empty means cash and position are zero.
     *
     * @param   trader  The address of the trader.
     * @param   begin   The begin index.
     * @param   end     The end index.
     * @return  result  An array of active (non-empty margin account) liquidity pool address and perpetul index.
     */
    function listActiveLiquidityPoolsOf(
        address trader,
        uint256 begin,
        uint256 end
    ) public view returns (PerpetualUID[] memory result) {
        require(end > begin, "begin should be lower than end");
        uint256 length = _traderActiveLiquidityPools[trader].length();
        if (begin >= length) {
            return result;
        }
        uint256 safeEnd = end.min(length);
        result = new PerpetualUID[](safeEnd.sub(begin));
        for (uint256 i = begin; i < safeEnd; i++) {
            result[i.sub(begin)] = _perpetualUIDs[_traderActiveLiquidityPools[trader].at(i)];
        }
        return result;
    }

    /**
     * @notice  Activate the perpetual for the trader. Active means the trader's account is not empty in
     *          the perpetual. Empty means cash and position are zero. Can only called by a liquidity pool.
     *
     * @param   trader          The address of the trader.
     * @param   perpetualIndex  The index of the perpetual in the liquidity pool.
     * @return  True if the activation is successful.
     */
    function activatePerpetualFor(address trader, uint256 perpetualIndex)
        external
        onlyLiquidityPool
        returns (bool)
    {
        bytes32 key = _getPerpetualKey(msg.sender, perpetualIndex);
        if (_perpetualUIDs[key].liquidityPool == address(0)) {
            _perpetualUIDs[key] = PerpetualUID({
                liquidityPool: msg.sender,
                perpetualIndex: perpetualIndex
            });
        }
        return _traderActiveLiquidityPools[trader].add(key);
    }

    /**
     * @notice  Deactivate the perpetual for the trader. Active means the trader's account is not empty in
     *          the perpetual. Empty means cash and position are zero. Can only called by a liquidity pool.
     *
     * @param   trader          The address of the trader.
     * @param   perpetualIndex  The index of the perpetual in the liquidity pool.
     * @return  True if the deactivation is successful.
     */
    function deactivatePerpetualFor(address trader, uint256 perpetualIndex)
        external
        onlyLiquidityPool
        returns (bool)
    {
        return
            _traderActiveLiquidityPools[trader].remove(
                _getPerpetualKey(msg.sender, perpetualIndex)
            );
    }

    // =========================== Active Liquidity Pool of Trader ===========================
    /**
     * @dev     Get the key of the perpetual
     * @param   liquidityPool   The address of the liquidity pool which the perpetual belongs to.
     * @param   perpetualIndex  The index of the perpetual in the liquidity pool.
     * @return  Key hash of the perpetual.
     */
    function _getPerpetualKey(address liquidityPool, uint256 perpetualIndex)
        internal
        pure
        returns (bytes32)
    {
        return keccak256(abi.encodePacked(liquidityPool, perpetualIndex));
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/EnumerableSetUpgradeable.sol";

import "../interface/IUpgradeableProxy.sol";
import "../interface/IVersionControl.sol";

import "../libraries/SafeMathExt.sol";

contract VersionControl is OwnableUpgradeable, IVersionControl {
    using Utils for EnumerableSetUpgradeable.Bytes32Set;
    using SafeMathExt for uint256;
    using AddressUpgradeable for address;
    using SafeMathUpgradeable for uint256;
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.Bytes32Set;

    struct VersionDescription {
        address liquidityPoolTemplate;
        address governorTemplate;
        uint256 compatibility;
    }

    EnumerableSetUpgradeable.Bytes32Set internal _versionKeys;
    mapping(bytes32 => VersionDescription) internal _versionDescriptions;
    mapping(bytes32 => bytes32) internal _deployedVersions;

    event AddVersion(
        bytes32 versionKey,
        address indexed liquidityPoolTemplate,
        address indexed governorTemplate,
        address indexed creator,
        uint256 compatibility,
        string note
    );

    /**
     * @notice Owner of version control.
     */
    function owner()
        public
        view
        virtual
        override(IVersionControl, OwnableUpgradeable)
        returns (address)
    {
        return OwnableUpgradeable.owner();
    }

    /**
     * @notice  Create a new version with template of liquidity pool and governor.
     *
     * @param   liquidityPoolTemplate   The address of the liquidityPool implementation.
     * @param   governorTemplate        The address of the governor implementation.
     * @param   compatibility           The compatibility of the implementation
     * @param   note                    The note of the version, only in log.
     * @return  versionKey              The key of the version added.
     */
    function addVersion(
        address liquidityPoolTemplate,
        address governorTemplate,
        uint256 compatibility,
        string calldata note
    ) external onlyOwner returns (bytes32 versionKey) {
        require(liquidityPoolTemplate.isContract(), "implementation must be contract");
        require(governorTemplate.isContract(), "implementation must be contract");

        versionKey = _getVersionHash(liquidityPoolTemplate, governorTemplate);
        require(!isVersionKeyValid(versionKey), "implementation already exists");

        _versionDescriptions[versionKey] = VersionDescription({
            liquidityPoolTemplate: liquidityPoolTemplate,
            governorTemplate: governorTemplate,
            compatibility: compatibility
        });
        _versionKeys.add(versionKey);

        emit AddVersion(
            versionKey,
            liquidityPoolTemplate,
            governorTemplate,
            msg.sender,
            compatibility,
            note
        );
    }

    /**
     * @notice  Get the latest created key of template. Revert if there is no key yet.
     *
     * @return  latestVersionKey    The key of the latest template of liquidity pool and governor.
     */
    function getLatestVersion() public view override returns (bytes32 latestVersionKey) {
        require(_versionKeys.length() > 0, "no version");
        latestVersionKey = _versionKeys.at(_versionKeys.length() - 1);
    }

    /**
     * @notice  Get the details of the version.
     *
     * @param   versionKey              The key of the version to get.
     * @return  liquidityPoolTemplate   The address of the liquidity pool template.
     * @return  governorTemplate        The address of the governor template.
     * @return  compatibility           The compatibility of the specified version.
     */
    function getVersion(bytes32 versionKey)
        public
        view
        override
        returns (
            address liquidityPoolTemplate,
            address governorTemplate,
            uint256 compatibility
        )
    {
        require(isVersionKeyValid(versionKey), "implementation is invalid");
        VersionDescription storage version = _versionDescriptions[versionKey];
        liquidityPoolTemplate = version.liquidityPoolTemplate;
        governorTemplate = version.governorTemplate;
        compatibility = version.compatibility;
    }

    /**
     * @notice  Get the description of the implementation of liquidity pool.
     *          Description contains creator, create time, compatibility and note
     *
     * @param  liquidityPool        The address of the liquidity pool.
     * @param  governor             The address of the governor.
     * @return appliedVersionKey    The version key of given liquidity pool and governor.
     */
    function getAppliedVersionKey(address liquidityPool, address governor)
        external
        view
        override
        returns (bytes32 appliedVersionKey)
    {
        bytes32 deployedAddressHash = _getVersionHash(liquidityPool, governor);
        appliedVersionKey = _deployedVersions[deployedAddressHash];
    }

    /**
     * @notice  Check if a key is valid (exists).
     *
     * @param   versionKey  The key of the version to test.
     * @return  isValid     Return true if the version of given key is valid.
     */
    function isVersionKeyValid(bytes32 versionKey) public view override returns (bool isValid) {
        isValid = _versionKeys.contains(versionKey);
    }

    /**
     * @notice  Check if the implementation of liquidity pool target is compatible with the implementation base.
     *          Being compatible means having larger compatibility.
     *
     * @param   targetVersionKey    The key of the version to be upgraded to.
     * @param   baseVersionKey      The key of the version to be upgraded from.
     * @return  isCompatible        True if the target version is compatible with the base version.
     */
    function isVersionCompatible(bytes32 targetVersionKey, bytes32 baseVersionKey)
        public
        view
        override
        returns (bool isCompatible)
    {
        require(isVersionKeyValid(targetVersionKey), "target version is invalid");
        require(isVersionKeyValid(baseVersionKey), "base version is invalid");
        isCompatible =
            _versionDescriptions[targetVersionKey].compatibility >=
            _versionDescriptions[baseVersionKey].compatibility;
    }

    /**
     * @dev     Get a certain number of implementations of liquidity pool within range [begin, end).
     *
     * @param   begin       The index of first element to retrieve.
     * @param   end         The end index of element, exclusive.
     * @return  versionKeys An array contains current version keys.
     */
    function listAvailableVersions(uint256 begin, uint256 end)
        external
        view
        override
        returns (bytes32[] memory versionKeys)
    {
        versionKeys = _versionKeys.toArray(begin, end);
    }

    function _getVersionHash(address liquidityPoolTemplate, address governorTemplate)
        internal
        pure
        returns (bytes32)
    {
        return keccak256(abi.encodePacked(liquidityPoolTemplate, governorTemplate));
    }

    function _updateDeployedInstances(
        bytes32 versionKeys,
        address liquidityPool,
        address governor
    ) internal {
        bytes32 deployedAddressHash = _getVersionHash(liquidityPool, governor);
        _deployedVersions[deployedAddressHash] = versionKeys;
    }

    function _validateUpgradeVersion(
        bytes32 targetVersionKey,
        address liquidityPool,
        address governor
    ) internal view {
        bytes32 deployedAddressHash = _getVersionHash(liquidityPool, governor);
        bytes32 baseVersionKey = _deployedVersions[deployedAddressHash];
        require(
            isVersionCompatible(targetVersionKey, baseVersionKey),
            "the target version is not compatible"
        );
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/Initializable.sol";

import "../interface/IVariables.sol";

contract Variables is Initializable, OwnableUpgradeable, IVariables {
    bytes32 internal _reserved1;
    address internal _symbolService;
    address internal _vault;
    int256 internal _vaultFeeRate;

    event SetVaultFeeRate(int256 prevFeeRate, int256 newFeeRate);
    event SetVault(address previousVault, address newVault);
    event SetKeeper(address previousKeeper, address newKeeper);
    event SetRewardDistributor(address previousRewardDistributor, address newRewardDistributor);

    function __Variables_init(
        address symbolService_,
        address vault_,
        int256 vaultFeeRate_
    ) internal initializer {
        require(symbolService_ != address(0), "invalid symbol service address");
        require(vault_ != address(0), "invalid vault address");
        require(vaultFeeRate_ >= 0, "negative vault fee rate");

        _symbolService = symbolService_;
        _vault = vault_;
        _vaultFeeRate = vaultFeeRate_;
    }

    /**
     * @notice Owner of version control.
     */
    function owner()
        public
        view
        virtual
        override(IVariables, OwnableUpgradeable)
        returns (address)
    {
        return OwnableUpgradeable.owner();
    }

    /**
     * @notice Get the address of the vault
     * @return address The address of the vault
     */
    function getVault() public view override returns (address) {
        return _vault;
    }

    /**
     * @notice Get the vault fee rate
     * @return int256 The vault fee rate
     */
    function getVaultFeeRate() public view override returns (int256) {
        return _vaultFeeRate;
    }

    /**
     * @notice  Set the vault address. Can only called by owner(dao).
     *
     * @param   newVault    The new value of the vault fee rate
     */
    function setVault(address newVault) external override onlyOwner {
        require(newVault != address(0), "new vault is zero-address");
        require(_vault != newVault, "new vault is already current vault");
        emit SetVault(_vault, newVault);
        _vault = newVault;
    }

    /**
     * @notice  Set the vault fee rate. Can only called by owner(dao).
     *
     * @param   newVaultFeeRate The new value of the vault fee rate
     */
    function setVaultFeeRate(int256 newVaultFeeRate) external override onlyOwner {
        require(newVaultFeeRate >= 0, "negative vault fee rate");
        require(newVaultFeeRate != _vaultFeeRate, "unchanged vault fee rate");

        emit SetVaultFeeRate(_vaultFeeRate, newVaultFeeRate);
        _vaultFeeRate = newVaultFeeRate;
    }

    /**
     * @notice Get the address of the access controller. It's always its own address.
     *
     * @return address The address of the access controller.
     */
    function getAccessController() external view override returns (address) {
        return address(this);
    }

    /**
     * @notice  Get the address of the symbol service.
     *
     * @return  Address The address of the symbol service.
     */
    function getSymbolService() external view override returns (address) {
        return _symbolService;
    }

    /**
     * @notice  Get the address of the mcb token.
     * @dev     [ConfirmBeforeDeployment]
     *
     * @return  Address The address of the mcb token.
     */
    function getMCBToken() public pure override returns (address) {
        return address(0x4e352cF164E64ADCBad318C3a1e222E9EBa4Ce42);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

import "../libraries/EnumerableMapExt.sol";
import "../libraries/BitwiseMath.sol";
import "../libraries/Constant.sol";

import "../interface/IAccessControl.sol";

contract AccessControl is IAccessControl {
    using BitwiseMath for uint256;
    using EnumerableMapExt for EnumerableMapExt.AddressToUintMap;

    mapping(address => EnumerableMapExt.AddressToUintMap) internal _accessControls;

    // privilege
    event GrantPrivilege(address indexed grantor, address indexed grantee, uint256 privilege);
    event RevokePrivilege(address indexed grantor, address indexed grantee, uint256 privilege);

    /**
     * @notice  Grant the grantee the privilege by sender.
     *          There are three kinds of privilege: deposit, withdraw and trade.
     *
     * @param   grantee     The address of the grantee.
     * @param   privilege   The privilege to grant.
     */
    function grantPrivilege(address grantee, uint256 privilege) external override {
        require(_isValid(privilege), "privilege is invalid");
        require(!isGranted(msg.sender, grantee, privilege), "privilege is already granted");
        uint256 grantedPrivileges = _accessControls[msg.sender].contains(grantee)
            ? _accessControls[msg.sender].get(grantee)
            : 0;
        grantedPrivileges = grantedPrivileges.set(privilege);
        _accessControls[msg.sender].set(grantee, grantedPrivileges);
        emit GrantPrivilege(msg.sender, grantee, privilege);
    }

    /**
     * @notice  Revoke the privilege of the grantee. Can only called by the grantor.
     *
     * @param   grantee     The address of the grantee, the account to accept privilege.
     * @param   privilege   The privilege to revoke.
     */
    function revokePrivilege(address grantee, uint256 privilege) external override {
        require(_isValid(privilege), "privilege is invalid");
        require(isGranted(msg.sender, grantee, privilege), "privilege is not granted");
        _accessControls[msg.sender].set(
            grantee,
            _accessControls[msg.sender].get(grantee).clean(privilege)
        );
        emit RevokePrivilege(msg.sender, grantee, privilege);
    }

    /**
     * @notice  Check if the grantee is granted the privilege by the grantor
     * @param   grantor     The address of the main account, the account gives privilege.
     * @param   grantee     The address of the grantee, the account to accept privilege.
     * @param   privilege   The privilege, there are three kinds of valid privilege: deposit, withdraw, trade
     * @return  True if the grantee is granted the privilege by the grantor.
     */
    function isGranted(
        address grantor,
        address grantee,
        uint256 privilege
    ) public view override returns (bool) {
        if (!_isValid(privilege)) {
            return false;
        }
        if (!_accessControls[grantor].contains(grantee)) {
            return false;
        }
        uint256 granted = _accessControls[grantor].get(grantee);
        return granted > 0 && granted.test(privilege);
    }

    function _isValid(uint256 privilege) private pure returns (bool) {
        return privilege > 0 && privilege <= Constant.PRIVILEGE_GUARD;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./Proxy.sol";
import "../utils/Address.sol";

/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 *
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) public payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            Address.functionDelegateCall(_logic, _data);
        }
    }

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }

    /**
     * @dev Upgrades the proxy to a new implementation.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal virtual {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");

        bytes32 slot = _IMPLEMENTATION_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }

    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/Context.sol";
/**
 * @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 Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @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 GSN 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 Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

import "@openzeppelin/contracts-upgradeable/utils/EnumerableSetUpgradeable.sol";

/**
 * @notice  Perpetual state:
 *          - INVALID:      Uninitialized or not non-existent perpetual;
 *          - INITIALIZING: Only when LiquidityPoolStorage.isRunning == false. Traders cannot perform operations;
 *          - NORMAL:       Full functional state. Traders is able to perform all operations;
 *          - EMERGENCY:    Perpetual is unsafe and only clear is available;
 *          - CLEARED:      All margin account is cleared. Trade could withdraw remaining margin balance.
 */
enum PerpetualState {
    INVALID,
    INITIALIZING,
    NORMAL,
    EMERGENCY,
    CLEARED
}
enum OrderType {
    LIMIT,
    MARKET,
    STOP
}

/**
 * @notice  Data structure to store risk parameter value.
 */
struct Option {
    int256 value;
    int256 minValue;
    int256 maxValue;
}

/**
 * @notice  Data structure to store oracle price data.
 */
struct OraclePriceData {
    int256 price;
    uint256 time;
}

/**
 * @notice  Data structure to store user margin information. See MarginAccountModule.sol for details.
 */
struct MarginAccount {
    int256 cash;
    int256 position;
    int256 targetLeverage;
}

/**
 * @notice  Data structure of an order object.
 */
struct Order {
    address trader;
    address broker;
    address relayer;
    address referrer;
    address liquidityPool;
    int256 minTradeAmount;
    int256 amount;
    int256 limitPrice;
    int256 triggerPrice;
    uint256 chainID;
    uint64 expiredAt;
    uint32 perpetualIndex;
    uint32 brokerFeeLimit;
    uint32 flags;
    uint32 salt;
}

/**
 * @notice  Core data structure, a core .
 */
struct LiquidityPoolStorage {
    bool isRunning;
    bool isFastCreationEnabled;
    // addresses
    address creator;
    address operator;
    address transferringOperator;
    address governor;
    address shareToken;
    address accessController;
    bool reserved3; // isWrapped
    uint256 scaler;
    uint256 collateralDecimals;
    address collateralToken;
    // pool attributes
    int256 poolCash;
    uint256 fundingTime;
    uint256 reserved5;
    uint256 operatorExpiration;
    mapping(address => int256) reserved1;
    bytes32[] reserved2;
    // perpetuals
    uint256 perpetualCount;
    mapping(uint256 => PerpetualStorage) perpetuals;
    // insurance fund
    int256 insuranceFundCap;
    int256 insuranceFund;
    int256 donatedInsuranceFund;
    address reserved4;
    // reserved slot for future upgrade
    bytes32[16] reserved;
}

/**
 * @notice  Core data structure, storing perpetual information.
 */
struct PerpetualStorage {
    uint256 id;
    PerpetualState state;
    address oracle;
    int256 totalCollateral;
    int256 openInterest;
    // prices
    OraclePriceData indexPriceData;
    OraclePriceData markPriceData;
    OraclePriceData settlementPriceData;
    // funding state
    int256 fundingRate;
    int256 unitAccumulativeFunding;
    // base parameters
    int256 initialMarginRate;
    int256 maintenanceMarginRate;
    int256 operatorFeeRate;
    int256 lpFeeRate;
    int256 referralRebateRate;
    int256 liquidationPenaltyRate;
    int256 keeperGasReward;
    int256 insuranceFundRate;
    int256 reserved1;
    int256 maxOpenInterestRate;
    // risk parameters
    Option halfSpread;
    Option openSlippageFactor;
    Option closeSlippageFactor;
    Option fundingRateLimit;
    Option fundingRateFactor;
    Option ammMaxLeverage;
    Option maxClosePriceDiscount;
    // users
    uint256 totalAccount;
    int256 totalMarginWithoutPosition;
    int256 totalMarginWithPosition;
    int256 redemptionRateWithoutPosition;
    int256 redemptionRateWithPosition;
    EnumerableSetUpgradeable.AddressSet activeAccounts;
    // insurance fund
    int256 reserved2;
    int256 reserved3;
    // accounts
    mapping(address => MarginAccount) marginAccounts;
    Option defaultTargetLeverage;
    // keeper
    address reserved4;
    EnumerableSetUpgradeable.AddressSet ammKeepers;
    EnumerableSetUpgradeable.AddressSet reserved5;
    // reserved slot for future upgrade
    bytes32[12] reserved;
}

// 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 SafeMath {
    /**
     * @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) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        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) {
        // 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) {
        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) {
        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) {
        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");
        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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b > 0, "SafeMath: modulo by zero");
        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) {
        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.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        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) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;

interface IUpgradeableProxy {
    function implementation() external view returns (address);

    function upgradeTo(address newImplementation) external;

    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable;
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;

import "./IProxyAdmin.sol";

interface IVersionControl {
    function owner() external view returns (address);

    function getLatestVersion() external view returns (bytes32 latestVersionKey);

    /**
     * @notice  Get the details of the version.
     *
     * @param   versionKey              The key of the version to get.
     * @return  liquidityPoolTemplate   The address of the liquidity pool template.
     * @return  governorTemplate        The address of the governor template.
     * @return  compatibility           The compatibility of the specified version.
     */
    function getVersion(bytes32 versionKey)
        external
        view
        returns (
            address liquidityPoolTemplate,
            address governorTemplate,
            uint256 compatibility
        );

    /**
     * @notice  Get the description of the implementation of liquidity pool.
     *          Description contains creator, create time, compatibility and note
     *
     * @param  liquidityPool        The address of the liquidity pool.
     * @param  governor             The address of the governor.
     * @return appliedVersionKey    The version key of given liquidity pool and governor.
     */
    function getAppliedVersionKey(address liquidityPool, address governor)
        external
        view
        returns (bytes32 appliedVersionKey);

    /**
     * @notice  Check if a key is valid (exists).
     *
     * @param   versionKey  The key of the version to test.
     * @return  isValid     Return true if the version of given key is valid.
     */
    function isVersionKeyValid(bytes32 versionKey) external view returns (bool isValid);

    /**
     * @notice  Check if the implementation of liquidity pool target is compatible with the implementation base.
     *          Being compatible means having larger compatibility.
     *
     * @param   targetVersionKey    The key of the version to be upgraded to.
     * @param   baseVersionKey      The key of the version to be upgraded from.
     * @return  isCompatible        True if the target version is compatible with the base version.
     */
    function isVersionCompatible(bytes32 targetVersionKey, bytes32 baseVersionKey)
        external
        view
        returns (bool isCompatible);

    /**
     * @dev     Get a certain number of implementations of liquidity pool within range [begin, end).
     *
     * @param   begin       The index of first element to retrieve.
     * @param   end         The end index of element, exclusive.
     * @return  versionKeys An array contains current version keys.
     */
    function listAvailableVersions(uint256 begin, uint256 end)
        external
        view
        returns (bytes32[] memory versionKeys);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;

import "./IProxyAdmin.sol";

interface IVariables {
    function owner() external view returns (address);

    /**
     * @notice Get the address of the vault
     * @return address The address of the vault
     */
    function getVault() external view returns (address);

    /**
     * @notice Get the vault fee rate
     * @return int256 The vault fee rate
     */
    function getVaultFeeRate() external view returns (int256);

    /**
     * @notice Get the address of the access controller. It's always its own address.
     *
     * @return address The address of the access controller.
     */
    function getAccessController() external view returns (address);

    /**
     * @notice  Get the address of the symbol service.
     *
     * @return  Address The address of the symbol service.
     */
    function getSymbolService() external view returns (address);

    /**
     * @notice  Set the vault address. Can only called by owner.
     *
     * @param   newVault    The new value of the vault fee rate
     */
    function setVault(address newVault) external;

    /**
     * @notice  Get the address of the mcb token.
     * @dev     [ConfirmBeforeDeployment]
     *
     * @return  Address The address of the mcb token.
     */
    function getMCBToken() external pure returns (address);

    /**
     * @notice  Set the vault fee rate. Can only called by owner.
     *
     * @param   newVaultFeeRate The new value of the vault fee rate
     */
    function setVaultFeeRate(int256 newVaultFeeRate) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

// The MIT License (MIT)

// Copyright (c) 2020 zOS Global Limited

// 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 SOFTWARE.

library EnumerableMapExt {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses internal functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        address _key;
        uint256 _value;
    }

    struct AddressToUintMap {
        // Storage of map keys and values
        MapEntry[] _entries;
        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping(address => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        AddressToUintMap storage map,
        address key,
        uint256 value
    ) internal returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) {
            // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

    /**
     * @dev Removes a key-value pair from a map. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(AddressToUintMap storage map, address key) internal returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex != 0) {
            // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(AddressToUintMap storage map, address key) internal view returns (bool) {
        return map._indexes[key] != 0;
    }

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function length(AddressToUintMap storage map) internal view returns (uint256) {
        return map._entries.length;
    }

    /**
     * @dev Returns the key-value pair stored at position `index` in the map. O(1).
     *
     * Note that there are no guarantees on the ordering of entries inside the
     * array, and it may change when more entries are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressToUintMap storage map, uint256 index)
        internal
        view
        returns (address, uint256)
    {
        require(map._entries.length > index, "EnumerableMap: index out of bounds");

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(AddressToUintMap storage map, address key) internal view returns (uint256) {
        return get(map, key, "EnumerableMap: nonexistent key");
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     */
    function get(
        AddressToUintMap storage map,
        address key,
        string memory errorMessage
    ) internal view returns (uint256) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.4;

library BitwiseMath {
    /**
     * @dev Check if the value is 1 at the bit position
     * @param value The value
     * @param bit The bit, should be 2^n
     * @return bool True if the value is 1 at the bit position
     */
    function test(uint256 value, uint256 bit) internal pure returns (bool) {
        return value & bit > 0;
    }

    /**
     * @dev Set the value to 1 at the bit position
     * @param value The value
     * @param bit The bit, should be 2^n
     * @return uint256 The modified value
     */
    function set(uint256 value, uint256 bit) internal pure returns (uint256) {
        return value | bit;
    }

    /**
     * @dev Set value to 0 at the bit position
     * @param value The value
     * @param bit The bit, should be 2^n
     * @return uint256 The modified value
     */
    function clean(uint256 value, uint256 bit) internal pure returns (uint256) {
        return value & (~bit);
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.7.4;

interface IAccessControl {
    function grantPrivilege(address trader, uint256 privilege) external;

    function revokePrivilege(address trader, uint256 privilege) external;

    function isGranted(
        address owner,
        address trader,
        uint256 privilege
    ) external view returns (bool);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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"address"},{"internalType":"uint256","name":"compatibility","type":"uint256"},{"internalType":"string","name":"note","type":"string"}],"name":"addVersion","outputs":[{"internalType":"bytes32","name":"versionKey","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"collateral","type":"address"},{"internalType":"uint256","name":"collateralDecimals","type":"uint256"},{"internalType":"int256","name":"nonce","type":"int256"},{"internalType":"bytes","name":"initData","type":"bytes"}],"name":"createLiquidityPool","outputs":[{"internalType":"address","name":"liquidityPool","type":"address"},{"internalType":"address","name":"governor","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"trader","type":"address"},{"internalType":"uint256","name":"perpetualIndex","type":"uint256"}],"name":"deactivatePerpetualFor","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getAccessController","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"trader","type":"address"}],"name":"getActiveLiquidityPoolCountOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"liquidityPool","type":"address"},{"internalType":"address","name":"governor","type":"address"}],"name":"getAppliedVersionKey","outputs":[{"internalType":"bytes32","name":"appliedVersionKey","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getKeeperCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLatestVersion","outputs":[{"internalType":"bytes32","name":"latestVersionKey","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLiquidityPoolCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getMCBToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"}],"name":"getOwnedLiquidityPoolsCountOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getSymbolService","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getVault","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getVaultFeeRate","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"versionKey","type":"bytes32"}],"name":"getVersion","outputs":[{"internalType":"address","name":"liquidityPoolTemplate","type":"address"},{"internalType":"address","name":"governorTemplate","type":"address"},{"internalType":"uint256","name":"compatibility","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"grantee","type":"address"},{"internalType":"uint256","name":"privilege","type":"uint256"}],"name":"grantPrivilege","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"guardianCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"guardians","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"symbolService","type":"address"},{"internalType":"address","name":"globalVault","type":"address"},{"internalType":"int256","name":"globalVaultFeeRate","type":"int256"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"trader","type":"address"},{"internalType":"address","name":"liquidityPool","type":"address"},{"internalType":"uint256","name":"perpetualIndex","type":"uint256"}],"name":"isActiveLiquidityPoolOf","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"grantor","type":"address"},{"internalType":"address","name":"grantee","type":"address"},{"internalType":"uint256","name":"privilege","type":"uint256"}],"name":"isGranted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isGuardian","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"keeper","type":"address"}],"name":"isKeeper","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"liquidityPool","type":"address"}],"name":"isLiquidityPool","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isUniverseSettled","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"targetVersionKey","type":"bytes32"},{"internalType":"bytes32","name":"baseVersionKey","type":"bytes32"}],"name":"isVersionCompatible","outputs":[{"internalType":"bool","name":"isCompatible","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"versionKey","type":"bytes32"}],"name":"isVersionKeyValid","outputs":[{"internalType":"bool","name":"isValid","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"trader","type":"address"},{"internalType":"uint256","name":"begin","type":"uint256"},{"internalType":"uint256","name":"end","type":"uint256"}],"name":"listActiveLiquidityPoolsOf","outputs":[{"components":[{"internalType":"address","name":"liquidityPool","type":"address"},{"internalType":"uint256","name":"perpetualIndex","type":"uint256"}],"internalType":"struct Tracer.PerpetualUID[]","name":"result","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"begin","type":"uint256"},{"internalType":"uint256","name":"end","type":"uint256"}],"name":"listAvailableVersions","outputs":[{"internalType":"bytes32[]","name":"versionKeys","type":"bytes32[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"begin","type":"uint256"},{"internalType":"uint256","name":"end","type":"uint256"}],"name":"listKeepers","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"uint256","name":"begin","type":"uint256"},{"internalType":"uint256","name":"end","type":"uint256"}],"name":"listLiquidityPoolOwnedBy","outputs":[{"internalType":"address[]","name":"result","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"begin","type":"uint256"},{"internalType":"uint256","name":"end","type":"uint256"}],"name":"listLiquidityPools","outputs":[{"internalType":"address[]","name":"result","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolVersion","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"liquidityPool","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"registerOperatorOfLiquidityPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"keeper","type":"address"}],"name":"removeKeeper","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceGuardian","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"grantee","type":"address"},{"internalType":"uint256","name":"privilege","type":"uint256"}],"name":"revokePrivilege","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"setUniverseSettled","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newVault","type":"address"}],"name":"setVault","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"int256","name":"newVaultFeeRate","type":"int256"}],"name":"setVaultFeeRate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"toAccount","type":"address"}],"name":"transferGuardian","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"upgradeAdmin","outputs":[{"internalType":"contract IProxyAdmin","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"targetVersionKey","type":"bytes32"},{"internalType":"bytes","name":"dataForLiquidityPool","type":"bytes"},{"internalType":"bytes","name":"dataForGovernor","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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