Cryo Explorer Ethereum Mainnet

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// SPDX-License-Identifier: MIT

// File @openzeppelin/contracts-ethereum-package/contracts/[email protected]

pragma solidity >=0.4.24 <0.7.0;


/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
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 use in the initializer function of a contract.
   */
  modifier initializer() {
    require(initializing || isConstructor() || !initialized, "Contract instance has already been 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;
    assembly { cs := extcodesize(self) }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}


// File @openzeppelin/contracts-ethereum-package/contracts/GSN/[email protected]

pragma solidity ^0.6.0;

/*
 * @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.
 */
contract ContextUpgradeSafe is Initializable {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.

    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-ethereum-package/contracts/access/[email protected]

pragma solidity ^0.6.0;


/**
 * @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.
 */
contract OwnableUpgradeSafe is Initializable, ContextUpgradeSafe {
    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 @openzeppelin/contracts-ethereum-package/contracts/math/[email protected]

pragma solidity ^0.6.0;

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

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        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) {
        // Solidity only automatically asserts when dividing by 0
        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-ethereum-package/contracts/token/ERC20/[email protected]

pragma solidity ^0.6.0;

/**
 * @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-ethereum-package/contracts/utils/[email protected]

pragma solidity ^0.6.2;

/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @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");
    }
}


// File @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/[email protected]

pragma solidity ^0.6.0;



/**
 * @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 ERC20;` 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));
    }

    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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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-ethereum-package/contracts/utils/[email protected]

pragma solidity ^0.6.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuardUpgradeSafe is Initializable {
    bool private _notEntered;


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

    function __ReentrancyGuard_init_unchained() internal initializer {


        // Storing an initial non-zero value makes deployment a bit more
        // expensive, but in exchange the refund on every call to nonReentrant
        // will be lower in amount. Since refunds are capped to a percetange of
        // the total transaction's gas, it is best to keep them low in cases
        // like this one, to increase the likelihood of the full refund coming
        // into effect.
        _notEntered = true;

    }


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

        // Any calls to nonReentrant after this point will fail
        _notEntered = false;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _notEntered = true;
    }

    uint256[49] private __gap;
}

// File contracts/interfaces/ILpTokenMigrator.sol

pragma solidity 0.6.12;

// note "contracts-ethereum-package" (but not "contracts") version of the package

interface ILpTokenMigrator {
  // Perform LP token migration from legacy UniswapV2 to PowerSwap.
  // Take the current LP token address and return the new LP token address.
  // Migrator should have full access to the caller's LP token.
  // Return the new LP token address.
  //
  // XXX Migrator must have allowance access to UniswapV2 LP tokens.
  // PowerSwap must mint EXACTLY the same amount of PowerSwap LP tokens or
  // else something bad will happen. Traditional UniswapV2 does not
  // do that so be careful!
  function migrate(IERC20 token, uint8 poolType) external returns (IERC20);
}

// File contracts/interfaces/IVestedLPMining.sol

pragma solidity 0.6.12;

/**
 * @notice
 */
interface IVestedLPMining {
  /**
   * @notice Initializes the storage of the contract
   * @dev "constructor" to be called on a new proxy deployment
   * @dev Sets the contract `owner` account to the deploying account
   */
  function initialize(
    IERC20 _cvp,
    address _reservoir,
    uint256 _cvpPerBlock,
    uint256 _startBlock,
    uint256 _cvpVestingPeriodInBlocks
  ) external;

  function poolLength() external view returns (uint256);

  /// @notice Add a new pool (only the owner may call)
  function add(
    uint256 _allocPoint,
    IERC20 _lpToken,
    uint8 _poolType,
    bool _votesEnabled,
    uint256 _lpBoostRate,
    uint256 _cvpBoostRate,
    uint256 _lpBoostMinRatio,
    uint256 _lpBoostMaxRatio
  ) external;

  /// @notice Update parameters of the given pool (only the owner may call)
  function set(
    uint256 _pid,
    uint256 _allocPoint,
    uint8 _poolType,
    bool _votesEnabled,
    uint256 _lpBoostRate,
    uint256 _cvpBoostRate,
    uint256 _lpBoostMinRatio,
    uint256 _lpBoostMaxRatio
  ) external;

  /// @notice Set the migrator contract (only the owner may call)
  function setMigrator(ILpTokenMigrator _migrator) external;

  /// @notice Set CVP reward per block (only the owner may call)
  /// @dev Consider updating pool before calling this function
  function setCvpPerBlock(uint256 _cvpPerBlock) external;

  /// @notice Set CVP vesting period in blocks (only the owner may call)
  function setCvpVestingPeriodInBlocks(uint256 _cvpVestingPeriodInBlocks) external;

  function setCvpPoolByMetaPool(address _metaPool, address _cvpPool) external;

  /// @notice Return the amount of pending CVPs entitled to the given user of the pool
  function pendingCvp(uint256 _pid, address _user) external view returns (uint256);

  /// @notice Return the amount of CVP tokens which may be vested to a user of a pool in the current block
  function vestableCvp(uint256 _pid, address user) external view returns (uint256);

  /// @notice Return `true` if the LP Token is added to created pools
  function isLpTokenAdded(IERC20 _lpToken) external view returns (bool);

  /// @notice Update reward computation params for all pools
  /// @dev Be careful of gas spending
  function massUpdatePools() external;

  /// @notice Update CVP tokens allocation for the given pool
  function updatePool(uint256 _pid) external;

  /// @notice Deposit the given amount of LP tokens to the given pool
  function deposit(
    uint256 _pid,
    uint256 _amount,
    uint256 _boostAmount
  ) external;

  /// @notice Withdraw the given amount of LP tokens from the given pool
  function withdraw(
    uint256 _pid,
    uint256 _amount,
    uint256 _boostAmount
  ) external;

  /// @notice Withdraw LP tokens without caring about pending CVP tokens. EMERGENCY ONLY.
  function emergencyWithdraw(uint256 _pid) external;

  /// @notice Write votes of the given user at the current block
  function checkpointVotes(address _user) external;

  /// @notice Get CVP amount and the share of CVPs in LP pools for the given account and the checkpoint
  function getCheckpoint(address account, uint32 checkpointId)
    external
    view
    returns (
      uint32 fromBlock,
      uint96 cvpAmount,
      uint96 pooledCvpShare
    );

  event AddLpToken(address indexed lpToken, uint256 indexed pid, uint256 allocPoint);
  event SetLpToken(address indexed lpToken, uint256 indexed pid, uint256 allocPoint);
  event SetMigrator(address indexed migrator);
  event SetCvpPerBlock(uint256 cvpPerBlock);
  event SetCvpVestingPeriodInBlocks(uint256 cvpVestingPeriodInBlocks);
  event SetCvpPoolByMetaPool(address indexed metaPool, address indexed cvpPool);
  event MigrateLpToken(address indexed oldLpToken, address indexed newLpToken, uint256 indexed pid);

  event Deposit(address indexed user, uint256 indexed pid, uint256 amount, uint256 boostAmount);
  event Withdraw(address indexed user, uint256 indexed pid, uint256 amount, uint256 boostAmount);
  event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount, uint256 boostAmount);

  event CheckpointTotalLpVotes(uint256 lpVotes);
  event CheckpointUserLpVotes(address indexed user, uint256 indexed pid, uint256 lpVotes);
  event CheckpointUserVotes(address indexed user, uint256 pendedVotes, uint256 lpVotesShare);
}


// File contracts/lib/ReservedSlots.sol

pragma solidity 0.6.12;

/// @dev Slots reserved for possible storage layout changes (it neither spends gas nor adds extra bytecode)
contract ReservedSlots {
    uint256[100] private __gap;
}

// File contracts/lib/SafeMath96.sol

pragma solidity 0.6.12;

library SafeMath96 {

    function add(uint96 a, uint96 b, string memory errorMessage) internal pure returns (uint96) {
        uint96 c = a + b;
        require(c >= a, errorMessage);
        return c;
    }

    function add(uint96 a, uint96 b) internal pure returns (uint96) {
        return add(a, b, "SafeMath96: addition overflow");
    }

    function sub(uint96 a, uint96 b, string memory errorMessage) internal pure returns (uint96) {
        require(b <= a, errorMessage);
        return a - b;
    }

    function sub(uint96 a, uint96 b) internal pure returns (uint96) {
        return sub(a, b, "SafeMath96: subtraction overflow");
    }

    function average(uint96 a, uint96 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }

    function fromUint(uint n, string memory errorMessage) internal pure returns (uint96) {
        require(n < 2**96, errorMessage);
        return uint96(n);
    }

    function fromUint(uint n) internal pure returns (uint96) {
        return fromUint(n, "SafeMath96: exceeds 96 bits");
    }
}


// File contracts/lib/SafeMath32.sol

pragma solidity 0.6.12;

library SafeMath32 {

    function add(uint32 a, uint32 b, string memory errorMessage) internal pure returns (uint32) {
        uint32 c = a + b;
        require(c >= a, errorMessage);
        return c;
    }

    function add(uint32 a, uint32 b) internal pure returns (uint32) {
        return add(a, b, "SafeMath32: addition overflow");
    }

    function sub(uint32 a, uint32 b, string memory errorMessage) internal pure returns (uint32) {
        require(b <= a, errorMessage);
        return a - b;
    }

    function sub(uint32 a, uint32 b) internal pure returns (uint32) {
        return sub(a, b, "SafeMath32: subtraction overflow");
    }

    function fromUint(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function fromUint(uint n) internal pure returns (uint32) {
        return fromUint(n, "SafeMath32: exceeds 32 bits");
    }
}

// File contracts/lib/DelegatableCheckpoints.sol

pragma solidity 0.6.12;

library DelegatableCheckpoints {

    /// @dev A checkpoint storing some data effective from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint192 data;
        // uint32 __reserved;
    }

    /// @dev A set of checkpoints and a 'delegatee'
    struct Record {
        uint32 numCheckpoints;
        uint32 lastCheckpointBlock;
        address delegatee;
        // uint32 __reserved;

        // Checkpoints by IDs
        mapping (uint32 => Checkpoint) checkpoints;
        // Checkpoint IDs get counted from 1 (but not from 0) -
        // the 1st checkpoint has ID of 1, and the last checkpoint' ID is `numCheckpoints`
    }

    function getCheckpoint(Record storage record, uint checkpointId)
    internal view returns (uint32 fromBlock, uint192 data)
    {
        return checkpointId == 0 || checkpointId > record.numCheckpoints
            ? (0, 0)
            : _getCheckpoint(record, uint32(checkpointId));
    }

    function _getCheckpoint(Record storage record, uint32 checkpointId)
    internal view returns (uint32 fromBlock, uint192 data)
    {
        return (record.checkpoints[checkpointId].fromBlock, record.checkpoints[checkpointId].data);
    }

    /**
     * @dev Gets the data recorded in the latest checkpoint of the given record
     */
    function getLatestData(Record storage record)
    internal view returns (uint192, uint32)
    {
        Record memory _record = record;
        return _record.numCheckpoints == 0
        ? (0, 0)
        : (record.checkpoints[_record.numCheckpoints].data, record.checkpoints[_record.numCheckpoints].fromBlock);
    }

    /**
     * @dev Returns the prior data written in the given record' checkpoints as of a block number
     * (reverts if the requested block has not been finalized)
     * @param record The record with checkpoints
     * @param blockNumber The block number to get the data at
     * @param checkpointId Optional ID of a checkpoint to first look into
     * @return The data effective as of the given block
     */
    function getPriorData(Record storage record, uint blockNumber, uint checkpointId)
    internal view returns (uint192, uint32)
    {
        uint32 blockNum = _safeMinedBlockNum(blockNumber);
        Record memory _record = record;
        Checkpoint memory cp;

        // First check specific checkpoint, if it's provided
        if (checkpointId != 0) {
            require(checkpointId <= _record.numCheckpoints, "ChPoints: invalid checkpoint id");
            uint32 cpId = uint32(checkpointId);

            cp = record.checkpoints[cpId];
            if (cp.fromBlock == blockNum) {
                return (cp.data, cp.fromBlock);
            } else if (cp.fromBlock < cp.fromBlock) {
                if (cpId == _record.numCheckpoints) {
                    return (cp.data, cp.fromBlock);
                }
                uint32 nextFromBlock = record.checkpoints[cpId + 1].fromBlock;
                if (nextFromBlock > blockNum) {
                    return (cp.data, cp.fromBlock);
                }
            }
        }

        // Finally, search trough all checkpoints
        (uint32 checkpointId, uint192 data) = _findCheckpoint(record, _record.numCheckpoints, blockNum);
        return (data, record.checkpoints[checkpointId].fromBlock);
    }

    /**
     * @dev Finds a checkpoint in the given record for the given block number
     * (reverts if the requested block has not been finalized)
     * @param record The record with checkpoints
     * @param blockNumber The block number to get the checkpoint at
     * @return id The checkpoint ID
     * @return data The checkpoint data
     */
    function findCheckpoint(Record storage record, uint blockNumber)
    internal view returns (uint32 id, uint192 data)
    {
        uint32 blockNum = _safeMinedBlockNum(blockNumber);
        uint32 numCheckpoints = record.numCheckpoints;

        (id, data) = _findCheckpoint(record, numCheckpoints, blockNum);
    }

    /**
     * @dev Writes a checkpoint with given data to the given record and returns the checkpoint ID
     */
    function writeCheckpoint(Record storage record, uint192 data)
    internal returns (uint32 id)
    {
        uint32 blockNum = _safeBlockNum(block.number);
        Record memory _record = record;

        uint192 oldData = _record.numCheckpoints > 0 ? record.checkpoints[_record.numCheckpoints].data : 0;
        bool isChanged = data != oldData;

        if (_record.lastCheckpointBlock != blockNum) {
            _record.numCheckpoints = _record.numCheckpoints + 1; // overflow chance ignored
            record.numCheckpoints = _record.numCheckpoints;
            record.lastCheckpointBlock = blockNum;
            isChanged = true;
        }
        if (isChanged) {
            record.checkpoints[_record.numCheckpoints] = Checkpoint(blockNum, data);
        }
        id = _record.numCheckpoints;
    }

    /**
     * @dev Gets the given record properties (w/o mappings)
     */
    function getProperties(Record storage record) internal view returns (uint32, uint32, address) {
        return (record.numCheckpoints, record.lastCheckpointBlock, record.delegatee);
    }

    /**
     * @dev Writes given delegatee to the given record
     */
    function writeDelegatee(Record storage record, address delegatee) internal {
        record.delegatee = delegatee;
    }

    function _safeBlockNum(uint256 blockNumber) private pure returns (uint32) {
        require(blockNumber < 2**32, "ChPoints: blockNum >= 2**32");
        return uint32(blockNumber);
    }

    function _safeMinedBlockNum(uint256 blockNumber) private view returns (uint32) {
        require(blockNumber < block.number, "ChPoints: block not yet mined");
        return _safeBlockNum(blockNumber);
    }

    function _findCheckpoint(Record storage record, uint32 numCheckpoints, uint32 blockNum)
    private view returns (uint32, uint192)
    {
        Checkpoint memory cp;

        // Check special cases first
        if (numCheckpoints == 0) {
            return (0, 0);
        }
        cp = record.checkpoints[numCheckpoints];
        if (cp.fromBlock <= blockNum) {
            return (numCheckpoints, cp.data);
        }
        if (record.checkpoints[1].fromBlock > blockNum) {
            return (0, 0);
        }

        uint32 lower = 1;
        uint32 upper = numCheckpoints;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            cp = record.checkpoints[center];
            if (cp.fromBlock == blockNum) {
                return (center, cp.data);
            } else if (cp.fromBlock < blockNum) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return (lower, record.checkpoints[lower].data);
    }
}


// File contracts/powerindex-mining/DelegatableVotes.sol

pragma solidity 0.6.12;

abstract contract DelegatableVotes {
  using SafeMath96 for uint96;
  using DelegatableCheckpoints for DelegatableCheckpoints.Record;

  /**
   * @notice Votes computation data for each account
   * @dev Data adjusted to account "delegated" votes
   * @dev For the contract address, stores shared for all accounts data
   */
  mapping(address => DelegatableCheckpoints.Record) public book;

  /**
   * @dev Data on votes which an account may delegate or has already delegated
   */
  mapping(address => uint192) internal delegatables;

  /// @notice The event is emitted when a delegate account' vote balance changes
  event CheckpointBalanceChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);

  /// @notice An event that's emitted when an account changes its delegate
  event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

  /**
   * @notice Get the "delegatee" account for the message sender
   */
  function delegatee() public view returns (address) {
    return book[msg.sender].delegatee;
  }

  /**
   * @notice Delegate votes from `msg.sender` to `delegatee`
   * @param delegatee_ The address to delegate votes to
   */
  function delegate(address delegatee_) public {
    require(delegatee_ != address(this), "delegate: can't delegate to the contract address");
    return _delegate(msg.sender, delegatee_);
  }

  /**
   * @notice Get the current votes balance for `account`
   * @param account The address to get votes balance
   * @return The number of current votes for `account`
   */
  function _getCurrentVotes(address account) internal view returns (uint96) {
    (uint192 userData, uint32 userDataBlockNumber) = book[account].getLatestData();
    if (userData == 0) return 0;

    (uint192 sharedData, ) = book[address(this)].getLatestData();
    (uint192 sharedDataAtUserSave, ) = book[address(this)].getPriorData(userDataBlockNumber, 0);
    return _computeUserVotes(userData, sharedData, sharedDataAtUserSave);
  }

  /**
   * @notice Determine the prior number of votes for the given account as of the given block
   * @dev To prevent misinformation, the call reverts if the block requested is not finalized
   * @param account The address of the account to get votes for
   * @param blockNumber The block number to get votes at
   * @return The number of votes the account had as of the given block
   */
  function _getPriorVotes(address account, uint256 blockNumber) internal view returns (uint96) {
    return _getPriorVotes(account, blockNumber, 0, 0);
  }

  /**
   * @notice Gas-optimized version of the `getPriorVotes` function -
   * it accepts IDs of checkpoints to look for votes data as of the given block in
   * (if the checkpoints miss the data, it get searched through all checkpoints recorded)
   * @dev Call (off-chain) the `findCheckpoints` function to get needed IDs
   * @param account The address of the account to get votes for
   * @param blockNumber The block number to get votes at
   * @param userCheckpointId ID of the checkpoint to look for the user data first
   * @param userCheckpointId ID of the checkpoint to look for the shared data first
   * @return The number of votes the account had as of the given block
   */
  function _getPriorVotes(
    address account,
    uint256 blockNumber,
    uint32 userCheckpointId,
    uint32 sharedCheckpointId
  ) internal view returns (uint96) {
    (uint192 userData, uint32 userDataBlockNumber) = book[account].getPriorData(blockNumber, userCheckpointId);
    if (userData == 0) return 0;

    (uint192 sharedData, ) = book[address(this)].getPriorData(blockNumber, sharedCheckpointId);
    (uint192 sharedDataAtUserSave, ) = book[address(this)].getPriorData(userDataBlockNumber, 0);
    return _computeUserVotes(userData, sharedData, sharedDataAtUserSave);
  }

  /// @notice Returns IDs of checkpoints which store the given account' votes computation data
  /// @dev Intended for off-chain use (by UI)
  function findCheckpoints(address account, uint256 blockNumber)
    external
    view
    returns (uint32 userCheckpointId, uint32 sharedCheckpointId)
  {
    require(account != address(0), "findCheckpoints: zero account");
    (userCheckpointId, ) = book[account].findCheckpoint(blockNumber);
    (sharedCheckpointId, ) = book[address(this)].findCheckpoint(blockNumber);
  }

  function _getCheckpoint(address account, uint32 checkpointId) internal view returns (uint32 fromBlock, uint192 data) {
    (fromBlock, data) = book[account].getCheckpoint(checkpointId);
  }

  function _writeSharedData(uint192 data) internal {
    book[address(this)].writeCheckpoint(data);
  }

  function _writeUserData(address account, uint192 data) internal {
    DelegatableCheckpoints.Record storage src = book[account];
    address _delegatee = src.delegatee;
    DelegatableCheckpoints.Record storage dst = _delegatee == address(0) ? src : book[_delegatee];

    (uint192 latestData, ) = dst.getLatestData();
    dst.writeCheckpoint(
      // keep in mind votes which others could have delegated
      _computeUserData(latestData, data, delegatables[account])
    );
    delegatables[account] = data;
  }

  function _moveUserData(
    address account,
    address from,
    address to
  ) internal {
    DelegatableCheckpoints.Record storage src;
    DelegatableCheckpoints.Record storage dst;

    if (from == address(0)) {
      // no former delegatee
      src = book[account];
      dst = book[to];
    } else if (to == address(0)) {
      // delegation revoked
      src = book[from];
      dst = book[account];
    } else {
      src = book[from];
      dst = book[to];
    }
    uint192 delegatable = delegatables[account];

    (uint192 srcPrevData, ) = src.getLatestData();
    uint192 srcData = _computeUserData(srcPrevData, 0, delegatable);
    if (srcPrevData != srcData) src.writeCheckpoint(srcData);

    (uint192 dstPrevData, ) = dst.getLatestData();
    uint192 dstData = _computeUserData(dstPrevData, delegatable, 0);
    if (dstPrevData != dstData) dst.writeCheckpoint(dstData);
  }

  function _delegate(address delegator, address delegatee_) internal {
    address currentDelegate = book[delegator].delegatee;
    book[delegator].delegatee = delegatee_;

    emit DelegateChanged(delegator, currentDelegate, delegatee_);

    _moveUserData(delegator, currentDelegate, delegatee_);
  }

  function _computeUserVotes(
    uint192 userData,
    uint192 sharedData,
    uint192 sharedDataAtUserSave
  ) internal pure virtual returns (uint96 votes);

  function _computeUserData(
    uint192 prevData,
    uint192 newDelegated,
    uint192 prevDelegated
  ) internal pure virtual returns (uint192 userData) {
    (uint96 prevA, uint96 prevB) = _unpackData(prevData);
    (uint96 newDelegatedA, uint96 newDelegatedB) = _unpackData(newDelegated);
    (uint96 prevDelegatedA, uint96 prevDelegatedB) = _unpackData(prevDelegated);
    userData = _packData(
      _getNewValue(prevA, newDelegatedA, prevDelegatedA),
      _getNewValue(prevB, newDelegatedB, prevDelegatedB)
    );
  }

  function _unpackData(uint192 data) internal pure virtual returns (uint96 valA, uint96 valB) {
    return (uint96(data >> 96), uint96((data << 96) >> 96));
  }

  function _packData(uint96 valA, uint96 valB) internal pure virtual returns (uint192 data) {
    return ((uint192(valA) << 96) | uint192(valB));
  }

  function _getNewValue(
    uint96 val,
    uint96 more,
    uint96 less
  ) internal pure virtual returns (uint96 newVal) {
    if (more == less) {
      newVal = val;
    } else if (more > less) {
      newVal = val.add(more.sub(less));
    } else {
      uint96 decrease = less.sub(more);
      newVal = val > decrease ? val.sub(decrease) : 0;
    }
  }

  uint256[50] private _gap; // reserved
}


// File contracts/powerindex-mining/VestedLPMining.sol

pragma solidity 0.6.12;

contract VestedLPMining is
  OwnableUpgradeSafe,
  ReentrancyGuardUpgradeSafe,
  ReservedSlots,
  DelegatableVotes,
  IVestedLPMining
{
  using SafeMath for uint256;
  using SafeMath96 for uint96;
  using SafeMath32 for uint32;

  using SafeERC20 for IERC20;

  /// @dev properties grouped to optimize storage costs

  struct User {
    uint32 lastUpdateBlock; // block when the params (below) were updated
    uint32 vestingBlock; // block by when all entitled CVP tokens to be vested
    uint96 pendedCvp; // amount of CVPs tokens entitled but not yet vested to the user
    uint96 cvpAdjust; // adjustments for pended CVP tokens amount computation
    // (with regard to LP token deposits/withdrawals in the past)
    uint256 lptAmount; // amount of LP tokens the user has provided to a pool
    /** @dev
     * At any time, the amount of CVP tokens entitled to a user but not yet vested is the sum of:
     * (1) CVP token amount entitled after the user last time deposited or withdrawn LP tokens
     *     = (user.lptAmount * pool.accCvpPerLpt) - user.cvpAdjust
     * (2) CVP token amount entitled before the last deposit or withdrawal but not yet vested
     *     = user.pendedCvp
     *
     * Whenever a user deposits or withdraws LP tokens to a pool:
     *   1. `pool.accCvpPerLpt` for the pool gets updated;
     *   2. CVP token amounts to be entitled and vested to the user get computed;
     *   3. Token amount which may be vested get sent to the user;
     *   3. User' `lptAmount`, `cvpAdjust` and `pendedCvp` get updated.
     *
     * Note comments on vesting rules in the `function _computeCvpVesting` code bellow.
     */
  }

  struct Pool {
    IERC20 lpToken; // address of the LP token contract
    bool votesEnabled; // if the pool is enabled to write votes
    uint8 poolType; // pool type (1 - Uniswap, 2 - Balancer)
    uint32 allocPoint; // points assigned to the pool, which affect CVPs distribution between pools
    uint32 lastUpdateBlock; // latest block when the pool params which follow was updated
    uint256 accCvpPerLpt; // accumulated distributed CVPs per one deposited LP token, times 1e12
  }

  // scale factor for `accCvpPerLpt`
  uint256 internal constant SCALE = 1e12;

  // The CVP TOKEN
  IERC20 public cvp;
  // Total amount of CVP tokens pended (not yet vested to users)
  uint96 public cvpVestingPool;

  // Reservoir address
  address public reservoir;
  // Vesting duration in blocks
  uint32 public cvpVestingPeriodInBlocks;
  // The block number when CVP powerindex-mining starts
  uint32 public startBlock;
  // The amount of CVP tokens rewarded to all pools every block
  uint96 public cvpPerBlock;

  // The migrator contract (only the owner may ...

// [truncated — 76893 bytes total]