Contract 0xddab2443e18b171077648254991f543413d35275

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0xfca30444d94065f726ccf8615fdf708fc898612e0a61a59d8e252588a15f850dWithdraw23241372022-12-01 0:31:487 hrs 26 mins ago0x61016604ad101565ba1433747af383aa59f2720a IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00791406
0x81342dfaa9657851e6b8983b3c2021495dfc8ff9b661e3279bf07805ec1e28aeDeposit23238052022-11-30 23:24:068 hrs 34 mins ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00700172
0xc193108f7d51b9cb03ebf43724890fb8c6467bf0e2060f086ba1f4b0ca84b04eWithdraw23237802022-11-30 23:19:008 hrs 39 mins ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0x36634a7ea6f5a167362398c4654acc61ac9c6445a0eee2dfd34f876b4d6a0b18Deposit23092242022-11-28 22:07:182 days 9 hrs ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0070004
0x13724ee378ee974106061329fbc8aed2d91504a0870a38a58eefe3a2b2c6d5ddWithdraw23091812022-11-28 21:58:362 days 10 hrs ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0x8bdd76fa4594e9aa6a9c9ebc60735094457aa318e24b42b139f3874b2545642cDeposit23085342022-11-28 19:47:362 days 12 hrs ago0x267363a6af9dec271e990cf8d855ffcb07db9738 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0063664
0x8929e9f6c885998ea9898e625c86ea1664a9b43ed29c74e0273551af7796dbd2Withdraw22914132022-11-26 10:11:304 days 21 hrs ago0x71abba53768a3d8fab89ff22aba855d36aaf0147 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0006578534
0x09c660d3c0c7ae2936a69119d0d879044cbf35fa9cbf012488f7ec3c8b2af4a6Deposit22807682022-11-24 22:21:306 days 9 hrs ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00700172
0x606fb1632b6235fbc0851335041416e1c6b08b503840aa16de8fc704891f7ff5Withdraw22807342022-11-24 22:14:246 days 9 hrs ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0x3a45011ddac8ff89421363268b99bba28e07622cec30ff2dd563ea1901947c8dDeposit22662252022-11-22 21:18:308 days 10 hrs ago0x267363a6af9dec271e990cf8d855ffcb07db9738 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0077718
0xd3f3ea92bb20e637e2227c0addb88277be9b9b46196cd25a5414ac11e445de63Deposit22661442022-11-22 21:01:368 days 10 hrs ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00854898
0x3691d30ce3ee960f693a3693832c4d5fdbe6f6b8fd842d7aefb1e337ce4a2a6bDeposit22503462022-11-20 15:53:3610 days 16 hrs ago0x0562a625c42931ca279e9baab375bbdf12ead098 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00700304
0x6f647c1148d2798778efce7bff6ea764b3f8f59277a33929a96237613d9477bcWithdraw22459522022-11-20 1:06:1811 days 6 hrs ago0x61016604ad101565ba1433747af383aa59f2720a IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00580206
0xe04068a68744d693f3fde19fadf67156654e9f9882f9a1fbd422a7b6ea262947Withdraw22444792022-11-19 20:08:1211 days 11 hrs ago0x71abba53768a3d8fab89ff22aba855d36aaf0147 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.000749041
0x01239ea2714e5857a3f36a50b0294a3ceb4ba7d6231d90acc3dd5d8afeac53bcWithdraw22424012022-11-19 13:06:0611 days 18 hrs ago0x0562a625c42931ca279e9baab375bbdf12ead098 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00791406
0x02cc9afea88907843b4ef032adba0c14c21783257d56cbe8c28eb73d1969f27fWithdraw22423982022-11-19 13:05:3011 days 18 hrs ago0x0562a625c42931ca279e9baab375bbdf12ead098 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0x165a19c179e172978835e662ab989b9893fd50212f8d2fffba382e0ae95b4947Deposit22423702022-11-19 12:59:5411 days 18 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00700304
0xaee67410c9108114e8a2e0aa3500c54e14a10bbcdcdeeb4535ef641e25b09bf7Deposit22422532022-11-19 12:36:3011 days 19 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00700304
0xe9fc2070d520ae3347c59e9fd5709b3406a840cb1be7e266dab62a5a277b58a0Withdraw22422312022-11-19 12:32:0611 days 19 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0x233363e6f24915c22a340a2f016e78a52801b0c5e6ff05afc217b220bd77324eWithdraw22422302022-11-19 12:31:5411 days 19 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00580206
0x4f66144ec5a351ddf10688ba2e70d833df858b5ff669b3ea180dd9919423930cWithdraw22291942022-11-17 16:24:4813 days 15 hrs ago0x7163b314d7c7c0197cd652f816faa0f9d03074a1 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0085392
0x5ab13c2b102b53edb95f52e3b6897ffab0352be51b3b6e911e04523f367f15ddWithdraw22283332022-11-17 13:29:3613 days 18 hrs ago0x6ed76abc8246ed029c529a31a1dbf4dc2cb25246 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0xf20fbe2108f935bd401e3233d6acd3bc3c4b16920cfb925990ec7acca1a78d2aWithdraw22164502022-11-15 21:29:1815 days 10 hrs ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00516263
0xc8055404035e6a43a10968d094288df7eec9ad4989d30dcfe2cf128a3e326c33Deposit22141902022-11-15 13:50:1815 days 18 hrs ago0x0ca6df523f93f8bc274d13e18f30e4f2ed1c835a IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00564003
0xacb184ef128e553dc37ac422489c7698f0386b1dcf57dea44fbfd1e0ec54ce5fDeposit22097172022-11-14 22:46:1816 days 9 hrs ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00563739
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0x8bdd76fa4594e9aa6a9c9ebc60735094457aa318e24b42b139f3874b2545642c23085342022-11-28 19:47:362 days 12 hrs ago 0xddab2443e18b171077648254991f543413d352750x267363a6af9dec271e990cf8d855ffcb07db973810.970384905702350305 CLV
0x8bdd76fa4594e9aa6a9c9ebc60735094457aa318e24b42b139f3874b2545642c23085342022-11-28 19:47:362 days 12 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d3527510.970384905702350305 CLV
0xfa04479c5ae97a0258cba82e1f16dcc60141be22f698a4f477c2c592ba2809d421543852022-11-07 3:47:5424 days 4 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.410482499440293917 CLV
0xfa04479c5ae97a0258cba82e1f16dcc60141be22f698a4f477c2c592ba2809d421543852022-11-07 3:47:5424 days 4 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.410482499440293917 CLV
0x8bbf6cc798d08a04480baf23fd34476515f4d485bb4f919cf1067f5e5ca03a8021511082022-11-06 16:45:5424 days 15 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.002916832295707906 CLV
0x8bbf6cc798d08a04480baf23fd34476515f4d485bb4f919cf1067f5e5ca03a8021511082022-11-06 16:45:5424 days 15 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.002916832295707906 CLV
0x8ae069523eb77198fb7d836018e3473ea17b2434e9d5c9000a27daf556cc15a221510762022-11-06 16:39:3024 days 15 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.159685446582047624 CLV
0x8ae069523eb77198fb7d836018e3473ea17b2434e9d5c9000a27daf556cc15a221510762022-11-06 16:39:3024 days 15 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.159685446582047624 CLV
0xf103944298a9619392bdb21887bc17ae86ff5cd7a05665ad372c6c40296c74b121492792022-11-06 10:33:0624 days 21 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.001072885788455766 CLV
0xf103944298a9619392bdb21887bc17ae86ff5cd7a05665ad372c6c40296c74b121492792022-11-06 10:33:0624 days 21 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.001072885788455766 CLV
0x95212de1d73fa51f37e5847305af3a7962af69b438c78959c162b715871762d621491132022-11-06 9:59:3024 days 21 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.004444445350351728 CLV
0x95212de1d73fa51f37e5847305af3a7962af69b438c78959c162b715871762d621491132022-11-06 9:59:3024 days 21 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.004444445350351728 CLV
0xf5bb5f56f659847fbdc6f27ae859f0dc5cd0d571634141ebb7c9ec16d27a3e2321490582022-11-06 9:48:2424 days 22 hrs ago 0xddab2443e18b171077648254991f543413d352750x267363a6af9dec271e990cf8d855ffcb07db973888.729331589199165116 CLV
0xf5bb5f56f659847fbdc6f27ae859f0dc5cd0d571634141ebb7c9ec16d27a3e2321490582022-11-06 9:48:2424 days 22 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d3527588.729331589199165116 CLV
0xedef328be872d99216897e4797e99637979d935a747a8f100c0f6a6002b8c9dc21480992022-11-06 6:33:0625 days 1 hr ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.00224513064984848 CLV
0xedef328be872d99216897e4797e99637979d935a747a8f100c0f6a6002b8c9dc21480992022-11-06 6:33:0625 days 1 hr ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.00224513064984848 CLV
0xb6f0d4d023bbdb2b2cb868707de2f1578743baac428f6dc337b91c816455d06721471902022-11-06 3:29:0625 days 4 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.002519124107133807 CLV
0xb6f0d4d023bbdb2b2cb868707de2f1578743baac428f6dc337b91c816455d06721471902022-11-06 3:29:0625 days 4 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.002519124107133807 CLV
0x6197ea2173f36e56db87f1dec63fb9e3118d62df253e196ffb89ed27e046bbf121448722022-11-05 19:38:4225 days 12 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.002295349491610463 CLV
0x6197ea2173f36e56db87f1dec63fb9e3118d62df253e196ffb89ed27e046bbf121448722022-11-05 19:38:4225 days 12 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.002295349491610463 CLV
0x30632ed6d789adb984af217697931dcddd780730165ec5067c4118f69368e49c21424492022-11-05 11:29:3025 days 20 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.002523958761876328 CLV
0x30632ed6d789adb984af217697931dcddd780730165ec5067c4118f69368e49c21424492022-11-05 11:29:3025 days 20 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.002523958761876328 CLV
0xca3b40b868ba924d90815adbbb68047bc83d3eeed689686efeb9e059cd23251721391722022-11-05 0:28:3626 days 7 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.002830503707439472 CLV
0xca3b40b868ba924d90815adbbb68047bc83d3eeed689686efeb9e059cd23251721391722022-11-05 0:28:3626 days 7 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.002830503707439472 CLV
0x9c040447101d3201c41ffa9763e8861c3336ca52c981d1eacec9e36f4c8a791d21344992022-11-04 8:42:1226 days 23 hrs ago 0xddab2443e18b171077648254991f543413d352750x786b1e24177fb2e821b9381174dfcc29bd61b4f70.00256230926410566 CLV
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Contract Source Code Verified (Exact Match)

Contract Name:
Excursions

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at clvscan.com on 2022-09-20
*/

/**
 *Submitted for verification at moonriver.moonscan.io on 2021-12-03
*/

// File: @openzeppelin/contracts/utils/Context.sol



pragma solidity >=0.6.0 <0.8.0;

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

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

// File: @openzeppelin/contracts/utils/EnumerableSet.sol



pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

            bytes32 lastvalue = set._values[lastIndex];

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

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

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

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

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

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

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

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

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

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

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

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


    // UintSet

    struct UintSet {
        Set _inner;
    }

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

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

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

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

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

// File: @openzeppelin/contracts/utils/Address.sol



pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

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

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

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

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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



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


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

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

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

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

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !Address.isContract(address(this));
    }
}

// File: @openzeppelin/contracts/access/AccessControl.sol



pragma solidity >=0.6.0 <0.8.0;




/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;

    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members.contains(account);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
        return _roles[role].members.at(index);
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");

        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");

        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

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



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

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

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

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

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

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

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

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

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

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

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

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



pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

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



pragma solidity >=0.6.0 <0.8.0;




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

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

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

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

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

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

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

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

// File: contracts/Excursions.sol



pragma solidity 0.6.12;






interface IWMOVR {
    function deposit() external payable;
    function withdraw(uint) external;
}

contract Excursions is Initializable, AccessControl {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    bytes32 public constant OPERATOR_ROLE = keccak256("OPERATOR");

    // Info of each user.
    struct UserInfo {
        uint256 amount;     // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        //
        // We do some fancy math here. Basically, any point in time, the amount of wanWans
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accRewardPerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
        //   1. The pool's `accRewardPerShare` (and `lastRewardTimestamp`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    // Info of each pool.
    struct PoolInfo {
        IERC20  lpToken;          // Address of LP token contract.
        IERC20  rewardToken;      // token address for reward

        uint256 currentSupply;   //
        uint256 bonusStartTimestamp;  //
        uint256 bonusEndTimestamp;    // Block number when bonus period ends.

        uint256 lastRewardTimestamp;  // Last block number that reward distribution occurs.
        uint256 accRewardPerShare;// Accumulated reward per share, times 1e12 or 1e32. See below.
        uint256 rewardPerSecond;   // tokens reward per block.
    }

    IWMOVR public wmovr;            // The WMOVR contract
    PoolInfo[] public poolInfo;   // Info of each pool.
    mapping (uint256 => mapping (address => UserInfo)) public userInfo;// Info of each user that stakes LP tokens.
    mapping (address => bool) public isCollateral;
    mapping (address => bool) public isRewardToken;
    
    event Add(uint256 indexed pid, address indexed lpToken, address indexed rewardToken, uint256 startTime, uint256 endTime, uint256 rewardPerSecond);
    event Set(uint256 indexed pid, uint256 endTime, uint256 rewardPerSecond);
    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);

    modifier onlyOperator() {
        require(hasRole(OPERATOR_ROLE, msg.sender), "not operator");
        _;
    }

    modifier onlyValidPool(uint256 _pid) {
        require(_pid < poolInfo.length,"invalid pid");
        _;
    }

    function initialize(address admin, address operator, IWMOVR _wmovr)
        external
        initializer
    {
        _setupRole(DEFAULT_ADMIN_ROLE, admin);
        _setupRole(OPERATOR_ROLE, operator);
        wmovr = _wmovr;
    }

    // Add a new lp to the pool. Can only be called by the owner.
    // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
    function add(address _lpToken, address _rewardToken, uint256 _startTime, uint256 _endTime, uint256 _rewardPerSecond)
        external
        onlyOperator
    {
        require(block.timestamp < _endTime, "invalid end time");
        require(_startTime < _endTime, "invalid start time");
        require(_lpToken != address(0), "invalid lp");
        require(_rewardToken != address(0), "invalid reward token");
        require(_rewardToken != _lpToken, "reward token cannot be same with lpToken");
        require(!isCollateral[_rewardToken], "collateral cannot use for reward");
        require(!isRewardToken[_lpToken], "reward token cannot use for collateral");
        isCollateral[_lpToken] = true;
        isRewardToken[_rewardToken] = true;

        poolInfo.push(PoolInfo({
            lpToken: IERC20(_lpToken),
            rewardToken: IERC20(_rewardToken),
            currentSupply: 0,
            bonusStartTimestamp: _startTime,
            bonusEndTimestamp: _endTime,
            lastRewardTimestamp: block.timestamp > _startTime ? block.timestamp : _startTime,
            accRewardPerShare: 0,
            rewardPerSecond: _rewardPerSecond
        }));
        emit Add((poolInfo.length - 1), _lpToken, _rewardToken, _startTime, _endTime, _rewardPerSecond);
    }

    // Update the given pool's. Can only be called by the owner.
    function set(uint256 _pid, uint256 _rewardPerSecond, uint256 _endTime)
        external
        onlyOperator
    {
        updatePool(_pid);
        poolInfo[_pid].rewardPerSecond = _rewardPerSecond;
        poolInfo[_pid].bonusEndTimestamp = _endTime;

        emit Set(_pid, _rewardPerSecond, _endTime);
    }

    // Update reward vairables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.timestamp <= pool.lastRewardTimestamp) {
            return;
        }

        if (pool.currentSupply == 0) {
            pool.lastRewardTimestamp = block.timestamp;
            return;
        }

        uint256 multiplier = getMultiplier(pool.lastRewardTimestamp, block.timestamp, pool.bonusStartTimestamp, pool.bonusEndTimestamp);
        uint256 tokenReward = multiplier.mul(pool.rewardPerSecond);
        pool.accRewardPerShare = pool.accRewardPerShare.add(tokenReward.mul(1e32).div(pool.currentSupply));
        pool.lastRewardTimestamp = block.timestamp;
    }

    function deposit(uint256 _pid, uint256 _amount) external onlyValidPool(_pid) {
        PoolInfo storage pool = poolInfo[_pid];

        updatePool(_pid);

        UserInfo storage user = userInfo[_pid][msg.sender];

        uint256 pending = user.amount.mul(pool.accRewardPerShare).div(1e32).sub(user.rewardDebt);

        pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);

        user.amount = user.amount.add(_amount);
        pool.currentSupply = pool.currentSupply.add(_amount);
        user.rewardDebt = user.amount.mul(pool.accRewardPerShare).div(1e32);

        if(pending > 0) {
            if (address(pool.rewardToken) == address(wmovr)) { // convert wmovr to wan 
                wmovr.withdraw(pending);
                msg.sender.transfer(pending);
            } else {
                pool.rewardToken.safeTransfer(msg.sender, pending);
            }
        }
        emit Deposit(msg.sender, _pid, _amount);
    }

    // Withdraw LP tokens from MasterChef.
    function withdraw(uint256 _pid, uint256 _amount) external onlyValidPool(_pid) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        updatePool(_pid);
        uint256 pending = user.amount.mul(pool.accRewardPerShare).div(1e32).sub(user.rewardDebt);

        if(_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.currentSupply = pool.currentSupply.sub(_amount);
        }
        user.rewardDebt = user.amount.mul(pool.accRewardPerShare).div(1e32);

        if (_amount > 0) {
            pool.lpToken.safeTransfer(msg.sender, _amount);
        }
        if(pending > 0) {
            if (address(pool.rewardToken) == address(wmovr)) { // convert wmovr to movr 
                wmovr.withdraw(pending);
                msg.sender.transfer(pending);
            } else {
                pool.rewardToken.safeTransfer(msg.sender, pending);
            }
        }
        emit Withdraw(msg.sender, _pid, _amount);
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdraw(uint256 _pid) external onlyValidPool(_pid) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        uint256 amount = user.amount;
        if(amount > 0){
            pool.currentSupply = pool.currentSupply.sub(user.amount);
            user.amount = 0;
            user.rewardDebt = 0;
            pool.lpToken.safeTransfer(msg.sender, amount);
        }
        emit EmergencyWithdraw(msg.sender, _pid, amount);
    }

    receive() external payable {
        require(msg.sender == address(wmovr), "Only support value from WMOVR"); // only accept MOVR via fallback from the WMOVR contract
    }

    /* Internal and Private Function */
    // Return reward multiplier over the given _from to _to block.
    function getMultiplier(uint256 _from, uint256 _to, uint256 _startTime, uint256 _endTime) internal pure returns (uint256) {
        if (_from >= _endTime) {
            return 0;
        }

        if (_to < _startTime) {
            return 0;
        }

        if (_from < _startTime) {
            _from = _startTime;
        }

        if (_to > _endTime) {
            _to = _endTime;
        }
        return _to.sub(_from);
    }

    /* Get Function*/
    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    // View function to see pending reward on frontend.
    function pendingReward(uint256 _pid, address _user) external view onlyValidPool(_pid) returns (uint256, uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accRewardPerShare = pool.accRewardPerShare;

        if (block.timestamp > pool.lastRewardTimestamp && pool.currentSupply != 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardTimestamp, block.timestamp, pool.bonusStartTimestamp, pool.bonusEndTimestamp);
            uint256 tokenReward = multiplier.mul(pool.rewardPerSecond);
            accRewardPerShare = accRewardPerShare.add(tokenReward.mul(1e32).div(pool.currentSupply));
        }
        return (user.amount, user.amount.mul(accRewardPerShare).div(1e32).sub(user.rewardDebt));
    }


}

Contract ABI

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IERC20","name":"lpToken","type":"address"},{"internalType":"contract IERC20","name":"rewardToken","type":"address"},{"internalType":"uint256","name":"currentSupply","type":"uint256"},{"internalType":"uint256","name":"bonusStartTimestamp","type":"uint256"},{"internalType":"uint256","name":"bonusEndTimestamp","type":"uint256"},{"internalType":"uint256","name":"lastRewardTimestamp","type":"uint256"},{"internalType":"uint256","name":"accRewardPerShare","type":"uint256"},{"internalType":"uint256","name":"rewardPerSecond","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_rewardPerSecond","type":"uint256"},{"internalType":"uint256","name":"_endTime","type":"uint256"}],"name":"set","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"}],"name":"updatePool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"userInfo","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"rewardDebt","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"wmovr","outputs":[{"internalType":"contract IWMOVR","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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Swarm Source

ipfs://45db38f7a723a5befc0dd8dd6573f55fb087850017bace3d1ec0b1fff7c48b22
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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