Contract 0xa4aB709f5eB75f3213734fC227D9e27352d1DB6c

 
Txn Hash
Block
From
To
Value [Txn Fee]
0xfe3c8a4eafed1f34c1760ff067eb6145aac88ff7359967cb2395673f4e6f24ac44044552021-01-29 4:07:5229 days 11 hrs ago0x6809c87c1352c521c5cd5dd66e85fe2b8b0d1885 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.00042626
0x1112f7e75c91e3ece3d01fc1f2cb71cb675456a1cfe7f8fead5e0c1fbdb123d325588212020-11-26 0:39:1593 days 15 hrs ago0x80dfae70fa28a498ab1ba8fc6b66879688971d95 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0xbf59dbef9f457e2651396d9d4c5597f9ac6d1b29a6fb3ac4b5b840faf2ae7e0125296462020-11-25 0:17:3094 days 15 hrs ago0xaa9c117e28028460452ddcc1e110aa61224a5bcb IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x9df2d19a8d0ab60d36a5b825d300622e6f85e67c07b4ee7787ad84ca3ade47a025235382020-11-24 19:11:5994 days 20 hrs ago0x5f57371d5775976a2f696ced7f5fa3ff6ea72c33 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x1d1191b6c4daaf888903d8f37afc86529ddceed2c8bd1587f45c8d17a8f8814525157112020-11-24 12:39:5395 days 3 hrs ago0x60a6d69802239e8678f35cf3cff8af6d64ab4088 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.00113766
0x0761ffd08fe824e1f20c133ef3712e22397137d0002d4994a8b255c7aea24cf325156662020-11-24 12:37:3895 days 3 hrs ago0x60a6d69802239e8678f35cf3cff8af6d64ab4088 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0xfacf6111a6ae6a88ba2b62748a32e83f0c9956cd621d9442215137996a81009925116512020-11-24 9:15:4195 days 6 hrs ago0x677d544ee2a0f0b7f940d28064e8f626ea333e57 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x41019c5a66056fc3fd7b4f89fb8cfacfe10d17cb14732d64f4a7e1872924c5e025113442020-11-24 9:00:2095 days 7 hrs ago0xe4ef1fe6b8dac72a005daceb7c6e8b21b8c3ff3c IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x775a7af22ca3a0bbb8b79300fd9f87dfc7ff486711c31e7551d2f1c4f484581125112432020-11-24 8:55:1795 days 7 hrs ago0x224dec528205597b54185f68d635a9d030e3dea8 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0xa5d85b908eb7c9f5c079382afe2bf786c367ae82f5f6bdc8efbc16570cd5df3325108572020-11-24 8:35:5995 days 7 hrs ago0xab104eea31e033f2359a43cb32901dd6d18d105f IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x3209570c302a94071f57d3f9ebb384fd0629e0c0a8ebd4354400ff8418eb71f125079072020-11-24 6:08:1295 days 9 hrs ago0xbce03405638247f5ca3ea767b2367b1af307ea81 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x0e524279f8aa9a10032ff2f880169332e2f9b567b79847fc1a6f91a62120c0fd25070972020-11-24 5:27:4195 days 10 hrs ago0x9d81e88fd24069356f1a9984e7579d383e097978 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x89d98527acc48cb8da89f1014278df6d94eae475639ef0e674f3ec536532bad824982892020-11-23 22:06:1895 days 17 hrs ago0xdfd071c0bce614c84c554a194ccfb31929935360 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x7aff21a794af5c7c3cde95c98edd6f3532894d9ea726673780ce1c4dc763221124975712020-11-23 21:30:2495 days 18 hrs ago0xf7d90327e1041bd9e513dd5d701ac79ff3b1ffaf IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x40478b04ca67395459da9f6809e1ef93074418779ab873e947c190740400a17224973122020-11-23 21:17:2795 days 18 hrs ago0x05b5560c16e1b225b08503c1dc51eb8b37c50de0 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x0b900146762876c4c1f15f9de4f98dcbfafe33d7e6642f810bacb22b2f33e99824972242020-11-23 21:13:0395 days 18 hrs ago0x6b49cf506dd7e3ae26abb2cc85efff382290f506 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0xd49cdb790007f58928ff1310c7047619c73eb91f96fddbaae48675903e52816524962852020-11-23 20:26:0695 days 19 hrs ago0xfc6de95c9b05e88fc1c645cd5f567e789dcfb614 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x35537ee2cfdac67283503a836d7de03c50acae1d0b10a2a428f0fb2e27467c0524959162020-11-23 20:07:3795 days 19 hrs ago0xa1cd48cd28555da25f4b96deab6ba1a1543a2ebb IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x8326f1df0df8683a2517cb2291ccbafdf1b200b9f41b7648299c6ffaeee5c15224958912020-11-23 20:06:2295 days 19 hrs ago0x993894799d8ae6ed114766a603dd9f0dee1b67a4 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x1e036d8c965387b908b5afc550bf50dedb1fe2e49dd20bbff73b83e601500bf324946032020-11-23 19:01:4195 days 21 hrs ago0xe272a25b3b30a6c76ab15224f24eaaeed24abed9 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0xd0e08ae1a5a2d8cf6fb7cd65a8eea6de4c5c21711cbbd2f9f5ccc647b865b63724921062020-11-23 16:56:5095 days 23 hrs ago0x72ac0dac4784d1b0f6f15ceb4ee918c40aada55b IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x795e4b679f9e5456a619796f795f5d1bd771bf940abdc4f3202bb093b64ad22724908192020-11-23 15:52:2796 days 12 mins ago0xe272a25b3b30a6c76ab15224f24eaaeed24abed9 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.00220046
0x24c4a1388e2715efc404a3ccea9956b5fd9e0777b79918a046602209731e72a524907012020-11-23 15:46:3396 days 18 mins ago0x09622b15409c17f93a2ab5407c9e2d5a4cd26cb5 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0xb822ed759f15604f2825d64b1386e667785108c874933d32e889c261709b774524889572020-11-23 14:19:1296 days 1 hr ago0x0f5ab2b1e8c8bd006998fbef515513f9779f04f6 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
0x28d860cb686303f77357c73cf9158dbb3c03d6a46399300ee13817994b64910224885532020-11-23 13:59:0096 days 2 hrs ago0xadb9a7cc511ab7a81a24c8d85fc6165a93567b87 IN  0xa4ab709f5eb75f3213734fc227d9e27352d1db6c0 BNB0.0019151
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Latest 25 internal transaction
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0x1112f7e75c91e3ece3d01fc1f2cb71cb675456a1cfe7f8fead5e0c1fbdb123d325588212020-11-26 0:39:1593 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x1112f7e75c91e3ece3d01fc1f2cb71cb675456a1cfe7f8fead5e0c1fbdb123d325588212020-11-26 0:39:1593 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x1112f7e75c91e3ece3d01fc1f2cb71cb675456a1cfe7f8fead5e0c1fbdb123d325588212020-11-26 0:39:1593 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x8bc142d8c30280950da80cf9681311a55eb6ea8b0 BNB
0x1112f7e75c91e3ece3d01fc1f2cb71cb675456a1cfe7f8fead5e0c1fbdb123d325588212020-11-26 0:39:1593 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x1112f7e75c91e3ece3d01fc1f2cb71cb675456a1cfe7f8fead5e0c1fbdb123d325588212020-11-26 0:39:1593 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x1112f7e75c91e3ece3d01fc1f2cb71cb675456a1cfe7f8fead5e0c1fbdb123d325588212020-11-26 0:39:1593 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x8bc142d8c30280950da80cf9681311a55eb6ea8b0 BNB
0xbf59dbef9f457e2651396d9d4c5597f9ac6d1b29a6fb3ac4b5b840faf2ae7e0125296462020-11-25 0:17:3094 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0xbf59dbef9f457e2651396d9d4c5597f9ac6d1b29a6fb3ac4b5b840faf2ae7e0125296462020-11-25 0:17:3094 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0xbf59dbef9f457e2651396d9d4c5597f9ac6d1b29a6fb3ac4b5b840faf2ae7e0125296462020-11-25 0:17:3094 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x8bc142d8c30280950da80cf9681311a55eb6ea8b0 BNB
0xbf59dbef9f457e2651396d9d4c5597f9ac6d1b29a6fb3ac4b5b840faf2ae7e0125296462020-11-25 0:17:3094 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0xbf59dbef9f457e2651396d9d4c5597f9ac6d1b29a6fb3ac4b5b840faf2ae7e0125296462020-11-25 0:17:3094 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0xbf59dbef9f457e2651396d9d4c5597f9ac6d1b29a6fb3ac4b5b840faf2ae7e0125296462020-11-25 0:17:3094 days 15 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x8bc142d8c30280950da80cf9681311a55eb6ea8b0 BNB
0x9df2d19a8d0ab60d36a5b825d300622e6f85e67c07b4ee7787ad84ca3ade47a025235382020-11-24 19:11:5994 days 20 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x9df2d19a8d0ab60d36a5b825d300622e6f85e67c07b4ee7787ad84ca3ade47a025235382020-11-24 19:11:5994 days 20 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x9df2d19a8d0ab60d36a5b825d300622e6f85e67c07b4ee7787ad84ca3ade47a025235382020-11-24 19:11:5994 days 20 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x8bc142d8c30280950da80cf9681311a55eb6ea8b0 BNB
0x9df2d19a8d0ab60d36a5b825d300622e6f85e67c07b4ee7787ad84ca3ade47a025235382020-11-24 19:11:5994 days 20 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x9df2d19a8d0ab60d36a5b825d300622e6f85e67c07b4ee7787ad84ca3ade47a025235382020-11-24 19:11:5994 days 20 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x9df2d19a8d0ab60d36a5b825d300622e6f85e67c07b4ee7787ad84ca3ade47a025235382020-11-24 19:11:5994 days 20 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x8bc142d8c30280950da80cf9681311a55eb6ea8b0 BNB
0x1d1191b6c4daaf888903d8f37afc86529ddceed2c8bd1587f45c8d17a8f8814525157112020-11-24 12:39:5395 days 3 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x1d1191b6c4daaf888903d8f37afc86529ddceed2c8bd1587f45c8d17a8f8814525157112020-11-24 12:39:5395 days 3 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x1d1191b6c4daaf888903d8f37afc86529ddceed2c8bd1587f45c8d17a8f8814525157112020-11-24 12:39:5395 days 3 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x1d1191b6c4daaf888903d8f37afc86529ddceed2c8bd1587f45c8d17a8f8814525157112020-11-24 12:39:5395 days 3 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x8bc142d8c30280950da80cf9681311a55eb6ea8b0 BNB
0x0761ffd08fe824e1f20c133ef3712e22397137d0002d4994a8b255c7aea24cf325156662020-11-24 12:37:3895 days 3 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x0761ffd08fe824e1f20c133ef3712e22397137d0002d4994a8b255c7aea24cf325156662020-11-24 12:37:3895 days 3 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x5bce5d58682f15541efc72d8f56c7d6221d541f10 BNB
0x0761ffd08fe824e1f20c133ef3712e22397137d0002d4994a8b255c7aea24cf325156662020-11-24 12:37:3895 days 3 hrs ago 0xa4ab709f5eb75f3213734fc227d9e27352d1db6c 0x8bc142d8c30280950da80cf9681311a55eb6ea8b0 BNB
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xe17701b569c616cc636a07ece63e4a0f0da60218

Contract Name:
BeefyVaultV2

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2020-11-18
*/

// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/GSN/Context.sol


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


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/math/SafeMath.sol


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) {
        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/utils/Address.sol


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) {
        // This method relies in 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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        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/token/ERC20/ERC20.sol


pragma solidity ^0.6.0;





/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three 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;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view 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 {_setupDecimals} is
     * called.
     *
     * 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 view returns (uint8) {
        return _decimals;
    }

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

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

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @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
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @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");

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

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

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


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 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/access/Ownable.sol


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 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 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/BIFI/interfaces/beefy/IStrategy.sol


pragma solidity ^0.6.0;

interface IStrategy {
    function want() external view returns (address);
    function deposit() external;
    function withdraw(uint256) external;
    function balanceOf() external view returns (uint256);
    function harvest() external;
}

// File: contracts/BIFI/vaults/BeefyVaultV2.sol


pragma solidity ^0.6.0;







/**
 * @dev Implementation of a vault to deposit funds for yield optimizing.
 * This is the contract that receives funds and that users interface with.
 * The yield optimizing strategy itself is implemented in a separate 'Strategy.sol' contract.
 */
contract BeefyVaultV2 is ERC20, Ownable {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    struct StratCandidate {
        address implementation;
        uint proposedTime;
    }

    // The last proposed strategy to switch to.
    StratCandidate public stratCandidate; 
    // The strategy currently in use by the vault.
    address public strategy;
    // The token the vault accepts and looks to maximize.
    IERC20 public token;
    // The minimum time it has to pass before a strat cantidate can be approved.
    uint256 public immutable approvalDelay;

    event NewStratCandidate(address implementation);
    event UpgradeStrat(address implementation);
    
    /**
     * @dev Sets the value of {token} to the token that the vault will
     * hold as underlying value. It initializes the vault's own 'moo' token.
     * This token is minted when someone does a deposit. It is burned in order
     * to withdraw the corresponding portion of the underlying assets.
     * @param _token the token to maximize.
     * @param _strategy the address of the strategy.
     * @param _name the name of the vault token.
     * @param _symbol the symbol of the vault token.
     * @param _approvalDelay the delay before a new strat can be approved.
     */
    constructor (
        address _token, 
        address _strategy, 
        string memory _name, 
        string memory _symbol, 
        uint256 _approvalDelay
    ) public ERC20(
        string(abi.encodePacked(_name)),
        string(abi.encodePacked(_symbol))
    ) {
        token = IERC20(_token);
        strategy = _strategy;
        approvalDelay = _approvalDelay;
    }

    /**
     * @dev It calculates the total underlying value of {token} held by the system.
     * It takes into account the vault contract balance, the strategy contract balance
     *  and the balance deployed in other contracts as part of the strategy.
     */
    function balance() public view returns (uint) {
        return token.balanceOf(address(this)).add(IStrategy(strategy).balanceOf());
    }

    /**
     * @dev Custom logic in here for how much the vault allows to be borrowed.
     * We return 100% of tokens for now. Under certain conditions we might
     * want to keep some of the system funds at hand in the vault, instead
     * of putting them to work.
     */
    function available() public view returns (uint256) {
        return token.balanceOf(address(this));
    }

    /**
     * @dev Function for various UIs to display the current value of one of our yield tokens.
     * Returns an uint256 with 18 decimals of how much underlying asset one vault share represents.
     */
    function getPricePerFullShare() public view returns (uint256) {
        return balance().mul(1e18).div(totalSupply());
    }

    /**
     * @dev A helper function to call deposit() with all the sender's funds.
     */
    function depositAll() external {
        deposit(token.balanceOf(msg.sender));
    }

    /**
     * @dev The entrypoint of funds into the system. People deposit with this function
     * into the vault. The vault is then in charge of sending funds into the strategy.
     */
    function deposit(uint _amount) public {
        uint256 _pool = balance();
        uint256 _before = token.balanceOf(address(this));
        token.safeTransferFrom(msg.sender, address(this), _amount);
        uint256 _after = token.balanceOf(address(this));
        _amount = _after.sub(_before); // Additional check for deflationary tokens
        uint256 shares = 0;
        if (totalSupply() == 0) {
            shares = _amount;
        } else {
            shares = (_amount.mul(totalSupply())).div(_pool);
        }
        _mint(msg.sender, shares);

        earn();
    }

    /**
     * @dev Function to send funds into the strategy and put them to work. It's primarily called
     * by the vault's deposit() function.
     */
    function earn() public {
        uint _bal = available();
        token.safeTransfer(strategy, _bal);
        IStrategy(strategy).deposit();
    }

    /**
     * @dev A helper function to call withdraw() with all the sender's funds.
     */
    function withdrawAll() external {
        withdraw(balanceOf(msg.sender));
    }

    /**
     * @dev Function to exit the system. The vault will withdraw the required tokens
     * from the strategy and pay up the token holder. A proportional number of IOU
     * tokens are burned in the process.
     */
    function withdraw(uint256 _shares) public {
        uint256 r = (balance().mul(_shares)).div(totalSupply());
        _burn(msg.sender, _shares);

        uint b = token.balanceOf(address(this));
        if (b < r) {
            uint _withdraw = r.sub(b);
            IStrategy(strategy).withdraw(_withdraw);
            uint _after = token.balanceOf(address(this));
            uint _diff = _after.sub(b);
            if (_diff < _withdraw) {
                r = b.add(_diff);
            }
        }

        token.safeTransfer(msg.sender, r);
    }

    /** 
     * @dev Sets the candidate for the new strat to use with this vault.
     * @param _implementation The address of the candidate strategy.  
     */
    function proposeStrat(address _implementation) public onlyOwner {
        stratCandidate = StratCandidate({ 
            implementation: _implementation,
            proposedTime: block.timestamp
         });

        emit NewStratCandidate(_implementation);
    }

    /** 
     * @dev It switches the active strat for the strat candidate. You have to call 'retireStrat'
     * in the strategy contract before. This pauses the old strat and makes sure that all the old 
     * strategy funds are sent back to this vault before switching strats. When upgrading, the 
     * candidate implementation is set to the 0x00 address, and proposedTime to a time happening in +100 years for safety. 
     */

    function upgradeStrat() public onlyOwner {
        require(stratCandidate.implementation != address(0), "There is no candidate");
        require(stratCandidate.proposedTime.add(approvalDelay) < block.timestamp, "Delay has not passed");
        
        emit UpgradeStrat(stratCandidate.implementation);

        strategy = stratCandidate.implementation;
        stratCandidate.implementation = address(0);
        stratCandidate.proposedTime = 5000000000;
        
        earn();
    }
}

Contract ABI

[{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_strategy","type":"address"},{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint256","name":"_approvalDelay","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"implementation","type":"address"}],"name":"NewStratCandidate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"implementation","type":"address"}],"name":"UpgradeStrat","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"approvalDelay","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"available","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"balance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"depositAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"earn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getPricePerFullShare","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_implementation","type":"address"}],"name":"proposeStrat","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stratCandidate","outputs":[{"internalType":"address","name":"implementation","type":"address"},{"internalType":"uint256","name":"proposedTime","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"strategy","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"upgradeStrat","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://25812017a6695e339f4c85058bb9525f476c4e050d6ebc2c589a911267a09beb
Block Transaction Gas Used Reward
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