Contract Address Details

0xa9D6748D1c3831A87c08a702D73AdF4b306b31A3

Contract Name
VeNETTStaking
Creator
0x71b891ā€“37be51 at 0x6f750eā€“13275c
Balance
0 METIS
Tokens
Fetching tokens...
Transactions
Fetching transactions...
Transfers
Fetching transfers...
Gas Used
Fetching gas used...
Last Balance Update
4509434
Contract name:
VeNETTStaking




Optimization enabled
true
Compiler version
v0.6.12+commit.27d51765




Optimization runs
9999
EVM Version
default




Verified at
2022-11-30T14:55:34.345361Z

Contract source code

// File: contracts/interfaces/IVeERC20.sol



pragma solidity ^0.6.12;

/// @title Vote Escrow ERC20 Token Interface
/// @notice Interface of a ERC20 token used for vote escrow and boosted farm. Notice that transfers and
/// allowances are disabled
interface IVeERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);
}
// File: @openzeppelin/contracts/utils/Context.sol



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;
    }
}

// File: contracts/VeERC20.sol



pragma solidity ^0.6.12;



/// @title VeERC20
/// @notice Modified version of ERC20 where transfers and allowances are disabled.
/// @dev Only minting and burning are allowed. The hook `_beforeTokenOperation` and
/// `_afterTokenOperation` methods are called before and after minting/burning respectively.
contract VeERC20 is Context, IVeERC20 {
    mapping(address => uint256) private _balances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /// @dev Emitted when `value` tokens are burned and minted
    event Burn(address indexed account, uint256 value);
    event Mint(address indexed beneficiary, uint256 value);

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public pure virtual returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenOperation(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Mint(account, amount);

        _afterTokenOperation(account, _balances[account]);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenOperation(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

        emit Burn(account, amount);

        _afterTokenOperation(account, _balances[account]);
    }

    /**
     * @dev Hook that is called before any minting and burning.
     * @param from the account transferring tokens
     * @param to the account receiving tokens
     * @param amount the amount being minted or burned
     */
    function _beforeTokenOperation(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any minting and burning.
     * @param account the account being affected
     * @param newBalance the new balance of `account` after minting/burning
     */
    function _afterTokenOperation(address account, uint256 newBalance) internal virtual {}
}
// File: @openzeppelin/contracts/access/Ownable.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @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;
    }
}

// File: contracts/VeNETT.sol



pragma solidity ^0.6.12;



interface IBoostedNETTFarm {
    function updateFactor(address, uint256) external;
}

/// @title Vote Escrow NETT - veNETT
/// @notice Infinite supply, used to receive extra farming yields and voting power
contract VeNETT is VeERC20("VeNETT", "veNETT"), Ownable {
    /// @notice the BoostedNETTFarm contract
    IBoostedNETTFarm public boostedNETTFarm;

    event UpdateBoostedNETTFarm(address indexed user, address boostedNETTFarm);

    /// @dev Creates `_amount` token to `_to`. Must only be called by the owner (VeNETTStaking)
    /// @param _to The address that will receive the mint
    /// @param _amount The amount to be minted
    function mint(address _to, uint256 _amount) external onlyOwner {
        _mint(_to, _amount);
    }

    /// @dev Destroys `_amount` tokens from `_from`. Callable only by the owner (VeNETTStaking)
    /// @param _from The address that will burn tokens
    /// @param _amount The amount to be burned
    function burnFrom(address _from, uint256 _amount) external onlyOwner {
        _burn(_from, _amount);
    }

    /// @dev Sets the address of the BoostedNETTFarm contract this updates
    /// @param _boostedNETTFarm the address of BoostedFarm
    function setBoostedNETTFarm(address _boostedNETTFarm) external onlyOwner {
        // We allow 0 address here if we want to disable the callback operations
        boostedNETTFarm = IBoostedNETTFarm(_boostedNETTFarm);

        emit UpdateBoostedNETTFarm(_msgSender(), _boostedNETTFarm);
    }

    function _afterTokenOperation(address _account, uint256 _newBalance) internal override {
        if (address(boostedNETTFarm) != address(0)) {
            boostedNETTFarm.updateFactor(_account, _newBalance);
        }
    }

    function renounceOwnership() public override onlyOwner {
        revert("VeNETT: Cannot renounce, can only transfer ownership");
    }
}
// File: @openzeppelin/contracts/utils/Address.sol



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);
            }
        }
    }
}

// File: @openzeppelin/contracts/math/SafeMath.sol



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;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol



pragma solidity >=0.6.0 <0.8.0;




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

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

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

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



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);
            }
        }
    }
}

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



pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

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



pragma solidity >=0.6.0 <0.8.0;

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

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

        return c;
    }

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

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

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



pragma solidity >=0.6.0 <0.8.0;




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

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

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

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

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

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

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

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

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



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


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

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

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

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

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

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

// File: @openzeppelin/contracts-upgradeable/GSN/ContextUpgradeable.sol



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 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;
}

// File: @openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol



pragma solidity >=0.6.0 <0.8.0;


/**
 * @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 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;
}

// File: contracts/VeNETTStaking.sol



pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;








/// @title Vote Escrow NETT Staking
/// @notice Stake NETT to earn veNETT, which you can use to earn higher farm yields and gain
/// voting power. Note that unstaking any amount of NETT will burn all of your existing veNETT.
contract VeNETTStaking is Initializable, OwnableUpgradeable {
    using SafeMathUpgradeable for uint256;
    using SafeERC20Upgradeable for IERC20Upgradeable;

    /// @notice Info for each user
    /// `balance`: Amount of NETT currently staked by user
    /// `rewardDebt`: The reward debt of the user
    /// `lastClaimTimestamp`: The timestamp of user's last claim or withdraw
    /// `speedUpEndTimestamp`: The timestamp when user stops receiving speed up benefits, or
    /// zero if user is not currently receiving speed up benefits
    struct UserInfo {
        uint256 balance;
        uint256 rewardDebt;
        uint256 lastClaimTimestamp;
        uint256 speedUpEndTimestamp;
        /**
         * @notice We do some fancy math here. Basically, any point in time, the amount of veNETT
         * entitled to a user but is pending to be distributed is:
         *
         *   pendingReward = pendingBaseReward + pendingSpeedUpReward
         *
         *   pendingBaseReward = (user.balance * accVeNETTPerShare) - user.rewardDebt
         *
         *   if user.speedUpEndTimestamp != 0:
         *     speedUpCeilingTimestamp = min(block.timestamp, user.speedUpEndTimestamp)
         *     speedUpSecondsElapsed = speedUpCeilingTimestamp - user.lastClaimTimestamp
         *     pendingSpeedUpReward = speedUpSecondsElapsed * user.balance * speedUpVeNETTPerSharePerSec
         *   else:
         *     pendingSpeedUpReward = 0
         */
    }

    IERC20Upgradeable public nett;
    VeNETT public veNETT;

    // @notice The maximum limit of veNETT user can have as percentage points of staked NETT
    /// For example, if user has `n` NETT staked, they can own a maximum of `n * maxCapPct / 100` veNETT.
    uint256 public maxCapPct;

    /// @notice The upper limit of `maxCapPct`
    uint256 public upperLimitMaxCapPct;

    /// @notice The accrued veNETT per share, scaled to `ACC_VENETT_PER_SHARE_PRECISION`
    uint256 public accVeNETTPerShare;    

    /// @notice Precision of `accVeNETTPerShare`
    uint256 public ACC_VENETT_PER_SHARE_PRECISION;

    /// @notice The last time that the reward variables were updated
    uint256 public lastRewardTimestamp;

    /// @notice veNETT per sec per NETT staked, scaled to `VENETT_PER_SHARE_PER_SEC_PRECISION`
    uint256 public veNETTPerSharePerSec;

    /// @notice Speed up veNETT per sec per NETT staked, scaled to `VENETT_PER_SHARE_PER_SEC_PRECISION`
    uint256 public speedUpVeNETTPerSharePerSec;

    /// @notice The upper limit of `veNETTPerSharePerSec` and `speedUpVeNETTPerSharePerSec`
    uint256 public upperLimitVeNETTPerSharePerSec;

    /// @notice Precision of `veNETTPerSharePerSec`
    uint256 public VENETT_PER_SHARE_PER_SEC_PRECISION;

    /// @notice Percentage of user's current staked NETT user has to deposit in order to start
    /// receiving speed up benefits, in parts per 100.
    /// @dev Specifically, user has to deposit at least `speedUpThreshold/100 * userStakedNETT` NETT.
    /// The only exception is the user will also receive speed up benefits if they are depositing
    /// with zero balance
    uint256 public speedUpThreshold;

    /// @notice The length of time a user receives speed up benefits
    uint256 public speedUpDuration;

    mapping(address => UserInfo) public userInfos;

    event Claim(address indexed user, uint256 amount);
    event Deposit(address indexed user, uint256 amount);
    event UpdateMaxCapPct(address indexed user, uint256 maxCapPct);
    event UpdateRewardVars(uint256 lastRewardTimestamp, uint256 accVeNETTPerShare);
    event UpdateSpeedUpThreshold(address indexed user, uint256 speedUpThreshold);
    event UpdateVeNETTPerSharePerSec(address indexed user, uint256 veNETTPerSharePerSec);
    event Withdraw(address indexed user, uint256 withdrawAmount, uint256 burnAmount);

    /// @notice Initialize with needed parameters
    /// @param _nett Address of the NETT token contract
    /// @param _veNETT Address of the veNETT token contract
    /// @param _veNETTPerSharePerSec veNETT per sec per NETT staked, scaled to `VENETT_PER_SHARE_PER_SEC_PRECISION`
    /// @param _speedUpVeNETTPerSharePerSec Similar to `_veNETTPerSharePerSec` but for speed up
    /// @param _speedUpThreshold Percentage of total staked NETT user has to deposit receive speed up
    /// @param _speedUpDuration Length of time a user receives speed up benefits
    /// @param _maxCapPct Maximum limit of veNETT user can have as percentage points of staked NETT
    function initialize(
        IERC20Upgradeable _nett,
        VeNETT _veNETT,
        uint256 _veNETTPerSharePerSec,
        uint256 _speedUpVeNETTPerSharePerSec,
        uint256 _speedUpThreshold,
        uint256 _speedUpDuration,
        uint256 _maxCapPct
    ) public initializer {
        __Ownable_init();

        require(address(_nett) != address(0), "VeNETTStaking: unexpected zero address for _nett");
        require(address(_veNETT) != address(0), "VeNETTStaking: unexpected zero address for _veNETT");

        upperLimitVeNETTPerSharePerSec = 1e36;
        require(
            _veNETTPerSharePerSec <= upperLimitVeNETTPerSharePerSec,
            "VeNETTStaking: expected _veNETTPerSharePerSec to be <= 1e36"
        );
        require(
            _speedUpVeNETTPerSharePerSec <= upperLimitVeNETTPerSharePerSec,
            "VeNETTStaking: expected _speedUpVeNETTPerSharePerSec to be <= 1e36"
        );

        require(
            _speedUpThreshold != 0 && _speedUpThreshold <= 100,
            "VeNETTStaking: expected _speedUpThreshold to be > 0 and <= 100"
        );

        require(_speedUpDuration <= 365 days, "VeNETTStaking: expected _speedUpDuration to be <= 365 days");

        upperLimitMaxCapPct = 10000000;
        require(
            _maxCapPct != 0 && _maxCapPct <= upperLimitMaxCapPct,
            "VeNETTStaking: expected _maxCapPct to be non-zero and <= 10000000"
        );

        maxCapPct = _maxCapPct;
        speedUpThreshold = _speedUpThreshold;
        speedUpDuration = _speedUpDuration;
        nett = _nett;
        veNETT = _veNETT;
        veNETTPerSharePerSec = _veNETTPerSharePerSec;
        speedUpVeNETTPerSharePerSec = _speedUpVeNETTPerSharePerSec;
        lastRewardTimestamp = block.timestamp;
        ACC_VENETT_PER_SHARE_PRECISION = 1e18;
        VENETT_PER_SHARE_PER_SEC_PRECISION = 1e18;
    }

    /// @notice Set maxCapPct
    /// @param _maxCapPct The new maxCapPct
    function setMaxCapPct(uint256 _maxCapPct) external onlyOwner {
        require(_maxCapPct > maxCapPct, "VeNETTStaking: expected new _maxCapPct to be greater than existing maxCapPct");
        require(
            _maxCapPct != 0 && _maxCapPct <= upperLimitMaxCapPct,
            "VeNETTStaking: expected new _maxCapPct to be non-zero and <= 10000000"
        );
        maxCapPct = _maxCapPct;
        emit UpdateMaxCapPct(_msgSender(), _maxCapPct);
    }

    /// @notice Set veNETTPerSharePerSec
    /// @param _veNETTPerSharePerSec The new veNETTPerSharePerSec
    function setVeNETTPerSharePerSec(uint256 _veNETTPerSharePerSec) external onlyOwner {
        require(
            _veNETTPerSharePerSec <= upperLimitVeNETTPerSharePerSec,
            "VeNETTStaking: expected _veNETTPerSharePerSec to be <= 1e36"
        );
        updateRewardVars();
        veNETTPerSharePerSec = _veNETTPerSharePerSec;
        emit UpdateVeNETTPerSharePerSec(_msgSender(), _veNETTPerSharePerSec);
    }

    /// @notice Set speedUpThreshold
    /// @param _speedUpThreshold The new speedUpThreshold
    function setSpeedUpThreshold(uint256 _speedUpThreshold) external onlyOwner {
        require(
            _speedUpThreshold != 0 && _speedUpThreshold <= 100,
            "VeNETTStaking: expected _speedUpThreshold to be > 0 and <= 100"
        );
        speedUpThreshold = _speedUpThreshold;
        emit UpdateSpeedUpThreshold(_msgSender(), _speedUpThreshold);
    }

    /// @notice Deposits NETT to start staking for veNETT. Note that any pending veNETT
    /// will also be claimed in the process.
    /// @param _amount The amount of NETT to deposit
    function deposit(uint256 _amount) external {
        require(_amount > 0, "VeNETTStaking: expected deposit amount to be greater than zero");

        updateRewardVars();

        UserInfo storage userInfo = userInfos[_msgSender()];

        if (_getUserHasNonZeroBalance(_msgSender())) {
            // Transfer to the user their pending veNETT before updating their UserInfo
            _claim();

            // We need to update user's `lastClaimTimestamp` to now to prevent
            // passive veNETT accrual if user hit their max cap.
            userInfo.lastClaimTimestamp = block.timestamp;

            uint256 userStakedNETT = userInfo.balance;

            // User is eligible for speed up benefits if `_amount` is at least
            // `speedUpThreshold / 100 * userStakedNETT`
            if (_amount.mul(100) >= speedUpThreshold.mul(userStakedNETT)) {
                userInfo.speedUpEndTimestamp = block.timestamp.add(speedUpDuration);
            }
        } else {
            // If user is depositing with zero balance, they will automatically
            // receive speed up benefits
            userInfo.speedUpEndTimestamp = block.timestamp.add(speedUpDuration);
            userInfo.lastClaimTimestamp = block.timestamp;
        }

        userInfo.balance = userInfo.balance.add(_amount);
        userInfo.rewardDebt = accVeNETTPerShare.mul(userInfo.balance).div(ACC_VENETT_PER_SHARE_PRECISION);

        nett.safeTransferFrom(_msgSender(), address(this), _amount);

        emit Deposit(_msgSender(), _amount);
    }

    /// @notice Withdraw staked NETT. Note that unstaking any amount of NETT means you will
    /// lose all of your current veNETT.
    /// @param _amount The amount of NETT to unstake
    function withdraw(uint256 _amount) external {
        require(_amount > 0, "VeNETTStaking: expected withdraw amount to be greater than zero");

        UserInfo storage userInfo = userInfos[_msgSender()];

        require(
            userInfo.balance >= _amount,
            "VeNETTStaking: cannot withdraw greater amount of NETT than currently staked"
        );
        updateRewardVars();

        // Note that we don't need to claim as the user's veNETT balance will be reset to 0
        userInfo.balance = userInfo.balance.sub(_amount);
        userInfo.rewardDebt = accVeNETTPerShare.mul(userInfo.balance).div(ACC_VENETT_PER_SHARE_PRECISION);
        userInfo.lastClaimTimestamp = block.timestamp;
        userInfo.speedUpEndTimestamp = 0;

        // Burn the user's current veNETT balance
        uint256 userVeNETTBalance = veNETT.balanceOf(_msgSender());
        veNETT.burnFrom(_msgSender(), userVeNETTBalance);

        // Send user their requested amount of staked NETT
        nett.safeTransfer(_msgSender(), _amount);

        emit Withdraw(_msgSender(), _amount, userVeNETTBalance);
    }

    /// @notice Claim any pending veNETT
    function claim() external {
        require(_getUserHasNonZeroBalance(_msgSender()), "VeNETTStaking: cannot claim veNETT when no NETT is staked");
        updateRewardVars();
        _claim();
    }

    /// @notice Get the pending amount of veNETT for a given user
    /// @param _user The user to lookup
    /// @return The number of pending veNETT tokens for `_user`
    function getPendingVeNETT(address _user) public view returns (uint256) {
        if (!_getUserHasNonZeroBalance(_user)) {
            return 0;
        }

        UserInfo memory user = userInfos[_user];

        // Calculate amount of pending base veNETT
        uint256 _accVeNETTPerShare = accVeNETTPerShare;
        uint256 secondsElapsed = block.timestamp.sub(lastRewardTimestamp);
        if (secondsElapsed > 0) {
            _accVeNETTPerShare = _accVeNETTPerShare.add(
                secondsElapsed.mul(veNETTPerSharePerSec).mul(ACC_VENETT_PER_SHARE_PRECISION).div(
                    VENETT_PER_SHARE_PER_SEC_PRECISION
                )
            );
        }
        uint256 pendingBaseVeNETT = _accVeNETTPerShare.mul(user.balance).div(ACC_VENETT_PER_SHARE_PRECISION).sub(
            user.rewardDebt
        );

        // Calculate amount of pending speed up veNETT
        uint256 pendingSpeedUpVeNETT;
        if (user.speedUpEndTimestamp != 0) {
            uint256 speedUpCeilingTimestamp = block.timestamp > user.speedUpEndTimestamp
                ? user.speedUpEndTimestamp
                : block.timestamp;
            uint256 speedUpSecondsElapsed = speedUpCeilingTimestamp.sub(user.lastClaimTimestamp);
            uint256 speedUpAccVeNETTPerShare = speedUpSecondsElapsed.mul(speedUpVeNETTPerSharePerSec);
            pendingSpeedUpVeNETT = speedUpAccVeNETTPerShare.mul(user.balance).div(VENETT_PER_SHARE_PER_SEC_PRECISION);
        }

        uint256 pendingVeNETT = pendingBaseVeNETT.add(pendingSpeedUpVeNETT);

        // Get the user's current veNETT balance
        uint256 userVeNETTBalance = veNETT.balanceOf(_user);

        // This is the user's max veNETT cap multiplied by 100
        uint256 scaledUserMaxVeNETTCap = user.balance.mul(maxCapPct);

        if (userVeNETTBalance.mul(100) >= scaledUserMaxVeNETTCap) {
            // User already holds maximum amount of veNETT so there is no pending veNETT
            return 0;
        } else if (userVeNETTBalance.add(pendingVeNETT).mul(100) > scaledUserMaxVeNETTCap) {
            return scaledUserMaxVeNETTCap.sub(userVeNETTBalance.mul(100)).div(100);
        } else {
            return pendingVeNETT;
        }
    }

    /// @notice Update reward variables
    function updateRewardVars() public {
        if (block.timestamp <= lastRewardTimestamp) {
            return;
        }

        if (nett.balanceOf(address(this)) == 0) {
            lastRewardTimestamp = block.timestamp;
            return;
        }

        uint256 secondsElapsed = block.timestamp.sub(lastRewardTimestamp);
        accVeNETTPerShare = accVeNETTPerShare.add(
            secondsElapsed.mul(veNETTPerSharePerSec).mul(ACC_VENETT_PER_SHARE_PRECISION).div(
                VENETT_PER_SHARE_PER_SEC_PRECISION
            )
        );

        lastRewardTimestamp = block.timestamp;

        emit UpdateRewardVars(lastRewardTimestamp, accVeNETTPerShare);
    }

    /// @notice Checks to see if a given user currently has staked NETT
    /// @param _user The user address to check
    /// @return Whether `_user` currently has staked NETT
    function _getUserHasNonZeroBalance(address _user) private view returns (bool) {
        return userInfos[_user].balance > 0;
    }

    /// @dev Helper to claim any pending veNETT
    function _claim() private {
        uint256 veNETTToClaim = getPendingVeNETT(_msgSender());
        
        UserInfo storage userInfo = userInfos[_msgSender()];

        userInfo.rewardDebt = accVeNETTPerShare.mul(userInfo.balance).div(ACC_VENETT_PER_SHARE_PRECISION);

        // If user's speed up period has ended, reset `speedUpEndTimestamp` to 0
        if (userInfo.speedUpEndTimestamp != 0 && block.timestamp >= userInfo.speedUpEndTimestamp) {
            userInfo.speedUpEndTimestamp = 0;
        }

        if (veNETTToClaim > 0) {
            userInfo.lastClaimTimestamp = block.timestamp;

            veNETT.mint(_msgSender(), veNETTToClaim);
            emit Claim(_msgSender(), veNETTToClaim);
        }
    }
}
        

Contract ABI

[{"type":"event","name":"Claim","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Deposit","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"UpdateMaxCapPct","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"maxCapPct","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"UpdateRewardVars","inputs":[{"type":"uint256","name":"lastRewardTimestamp","internalType":"uint256","indexed":false},{"type":"uint256","name":"accVeNETTPerShare","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"UpdateSpeedUpThreshold","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"speedUpThreshold","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"UpdateVeNETTPerSharePerSec","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"veNETTPerSharePerSec","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Withdraw","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"withdrawAmount","internalType":"uint256","indexed":false},{"type":"uint256","name":"burnAmount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"ACC_VENETT_PER_SHARE_PRECISION","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"VENETT_PER_SHARE_PER_SEC_PRECISION","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"accVeNETTPerShare","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"claim","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"deposit","inputs":[{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getPendingVeNETT","inputs":[{"type":"address","name":"_user","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"initialize","inputs":[{"type":"address","name":"_nett","internalType":"contract IERC20Upgradeable"},{"type":"address","name":"_veNETT","internalType":"contract VeNETT"},{"type":"uint256","name":"_veNETTPerSharePerSec","internalType":"uint256"},{"type":"uint256","name":"_speedUpVeNETTPerSharePerSec","internalType":"uint256"},{"type":"uint256","name":"_speedUpThreshold","internalType":"uint256"},{"type":"uint256","name":"_speedUpDuration","internalType":"uint256"},{"type":"uint256","name":"_maxCapPct","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"lastRewardTimestamp","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"maxCapPct","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IERC20Upgradeable"}],"name":"nett","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setMaxCapPct","inputs":[{"type":"uint256","name":"_maxCapPct","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setSpeedUpThreshold","inputs":[{"type":"uint256","name":"_speedUpThreshold","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setVeNETTPerSharePerSec","inputs":[{"type":"uint256","name":"_veNETTPerSharePerSec","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"speedUpDuration","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"speedUpThreshold","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"speedUpVeNETTPerSharePerSec","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateRewardVars","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"upperLimitMaxCapPct","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"upperLimitVeNETTPerSharePerSec","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"balance","internalType":"uint256"},{"type":"uint256","name":"rewardDebt","internalType":"uint256"},{"type":"uint256","name":"lastClaimTimestamp","internalType":"uint256"},{"type":"uint256","name":"speedUpEndTimestamp","internalType":"uint256"}],"name":"userInfos","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract VeNETT"}],"name":"veNETT","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"veNETTPerSharePerSec","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdraw","inputs":[{"type":"uint256","name":"_amount","internalType":"uint256"}]}]
              

Contract Creation Code

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