Contract 0xddaB2443e18B171077648254991f543413d35275

Txn Hash Method
Block
From
To
Value [Txn Fee]
0x2eebb50f562ef3a2c93b237641baeff7da4cd472ce92ae33d8edb290634d5bd6Deposit28071562023-02-06 22:45:429 hrs 36 mins ago0x267363a6af9dec271e990cf8d855ffcb07db9738 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0063664
0xb243183f818fb946e74fada4e219536592632178d4a54a0726002b7d5c54e520Withdraw28067532023-02-06 21:24:4210 hrs 57 mins ago0xce4078281de3c1b3f493743b6322a38325b7503e IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0065134
0x3a43d93007ea9bb7add785f1737fb6722d82a8c1facd6b0d4a73a1968bd3547aWithdraw28051702023-02-06 16:01:4216 hrs 20 mins ago0x71abba53768a3d8fab89ff22aba855d36aaf0147 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.000846742
0xfcc15386ea847adf549da6526ad929ba00d308eaa679f0191614ef5a75d0089aWithdraw28051582023-02-06 15:59:1816 hrs 22 mins ago0x71abba53768a3d8fab89ff22aba855d36aaf0147 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.000685698
0x5bfdfaea429461773eecda82b196a8315f43e054c0f9c9b208bef6c70f2517d3Withdraw28051492023-02-06 15:57:3016 hrs 24 mins ago0x71abba53768a3d8fab89ff22aba855d36aaf0147 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.000685698
0x97274dacb90ac29a4889e1732e639a1a8c20d4613e1ed94a13ebd931c5f930e9Withdraw27866612023-02-04 1:39:423 days 6 hrs ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0x654b10d52468fdc10184321891f917717799f87005df9e13ca30268148d75c98Withdraw27821912023-02-03 10:33:063 days 21 hrs ago0xfc2f3c2b6872d6ad347e78f096026274326ab081 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0x41070c4c726a122a55a439b878dcdf127392a3e3cc060123cb25c5a0bc6a76a9Withdraw27821892023-02-03 10:32:423 days 21 hrs ago0xfc2f3c2b6872d6ad347e78f096026274326ab081 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00791406
0xdb01fdfa59e5d9b2224298433fa9d818c7d613f124f266ba3a6474f3045a80b7Deposit27717792023-02-01 23:30:245 days 8 hrs ago0x267363a6af9dec271e990cf8d855ffcb07db9738 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0063664
0x8d98e7bb12cf8145aa3ca981cbf2bd767e2f6f11bdfd92c2d834bfb69e84e58dDeposit27426192023-01-28 21:02:309 days 11 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00700304
0x3fdfeec2ac8ffc54be9affaf7265e02776c9b1a345acfa8e0d57a3d4bbc6e63aWithdraw27426152023-01-28 21:01:429 days 11 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00728112
0x3ba4b895855adb1724f7e88fd3f48355e62548c7932cc628c434c9704e193bb8Withdraw27426132023-01-28 21:01:189 days 11 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00939312
0xe6ff06e75dbefc667038fc513a87637816bb4b71278fc3d28aee986e41af6aebDeposit27425932023-01-28 20:57:189 days 11 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00700304
0x753197f75994aebca4352abf2f9407359d9204a62abeb2ea61a421334efe884eWithdraw27425892023-01-28 20:56:309 days 11 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00939312
0x7cd25023091101c7d3aae55f9d4faa8231d52dcb7d68d4144b44265f2713af00Deposit27425812023-01-28 20:54:549 days 11 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00700304
0x12d5350591fc82c9ea3796953aebf01981d22d70f60ed0b664db6ee24cfb759eWithdraw27425782023-01-28 20:54:189 days 11 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00939312
0x19d4e1d613a54430039a8dc69a44fb77a5e7b2ad08444e400279375bd82f7248Withdraw27425732023-01-28 20:53:189 days 11 hrs ago0x70981296c3358984f725bc5309aa82010e9b1726 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00728112
0x2e104197385cb4eb0e3c4bfb808a28665e0c2795ff429bef6de65a5884016a05Deposit27363042023-01-27 23:45:1810 days 8 hrs ago0x267363a6af9dec271e990cf8d855ffcb07db9738 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.0063664
0xdfc4a58994ab185e3c9b53d79a0649d3aa157542e0f8d43e83efb95d0787ab8fDeposit27351642023-01-27 19:56:0610 days 12 hrs ago0xfc2f3c2b6872d6ad347e78f096026274326ab081 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00699908
0xbc9d9156cd5d81472cd0b77de6bc77f0d2812f9cd0f369d59634fe6a1b0bf557Deposit27351622023-01-27 19:55:4210 days 12 hrs ago0xfc2f3c2b6872d6ad347e78f096026274326ab081 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00774807
0x07cbe8ee7e700c8cdf1d23d83ad9e3afbd76fc20fe086dd50ed2ef90c280eeaaWithdraw27351372023-01-27 19:50:4210 days 12 hrs ago0xfc2f3c2b6872d6ad347e78f096026274326ab081 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00791406
0x680bd128db4ccb16f6c78ebdbf8ef6f7dae0544e94d56ec4a3a53225e596954fWithdraw27351342023-01-27 19:50:0610 days 12 hrs ago0xfc2f3c2b6872d6ad347e78f096026274326ab081 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00716474
0x2efb018b16e7921cc558156585090a219c82442383ab866be0a8624447ff9824Withdraw27326542023-01-27 11:29:2410 days 20 hrs ago0x118ab83b457a3a0a5b0120e9714caaa5cde890bd IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00791406
0x7b9a5fd70a76ff620c8c92e3fc6bb71824804a4a5bbccb0655b92696991114ebDeposit27315712023-01-27 7:51:0611 days 30 mins ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00854898
0xee8364dd7eaa0aa980d060b6f7f98ef6c3355af1f48fbe49811b4805769e130cWithdraw27315662023-01-27 7:50:0611 days 31 mins ago0x0617a09a1f1d091f51e296738d452e8a42abf475 IN  0xddab2443e18b171077648254991f543413d352750 CLV0.00516263
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0x2eebb50f562ef3a2c93b237641baeff7da4cd472ce92ae33d8edb290634d5bd628071562023-02-06 22:45:429 hrs 36 mins ago 0xddab2443e18b171077648254991f543413d352750x267363a6af9dec271e990cf8d855ffcb07db973898.680349762317070537 CLV
0x2eebb50f562ef3a2c93b237641baeff7da4cd472ce92ae33d8edb290634d5bd628071562023-02-06 22:45:429 hrs 36 mins ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d3527598.680349762317070537 CLV
0xb243183f818fb946e74fada4e219536592632178d4a54a0726002b7d5c54e52028067532023-02-06 21:24:4210 hrs 57 mins ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e7.422165625472485464 CLV
0xb243183f818fb946e74fada4e219536592632178d4a54a0726002b7d5c54e52028067532023-02-06 21:24:4210 hrs 57 mins ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352757.422165625472485464 CLV
0xdb01fdfa59e5d9b2224298433fa9d818c7d613f124f266ba3a6474f3045a80b727717792023-02-01 23:30:245 days 8 hrs ago 0xddab2443e18b171077648254991f543413d352750x267363a6af9dec271e990cf8d855ffcb07db973897.23996932770742927 CLV
0xdb01fdfa59e5d9b2224298433fa9d818c7d613f124f266ba3a6474f3045a80b727717792023-02-01 23:30:245 days 8 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d3527597.23996932770742927 CLV
0x2e104197385cb4eb0e3c4bfb808a28665e0c2795ff429bef6de65a5884016a0527363042023-01-27 23:45:1810 days 8 hrs ago 0xddab2443e18b171077648254991f543413d352750x267363a6af9dec271e990cf8d855ffcb07db9738128.728399146415671068 CLV
0x2e104197385cb4eb0e3c4bfb808a28665e0c2795ff429bef6de65a5884016a0527363042023-01-27 23:45:1810 days 8 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d35275128.728399146415671068 CLV
0x91d2e6d4cb5cf09430b041c93748cbc8cf0daf24921ff77fef8793502e7691a326856142023-01-20 20:32:1217 days 11 hrs ago 0xddab2443e18b171077648254991f543413d352750x267363a6af9dec271e990cf8d855ffcb07db9738114.342855542136827166 CLV
0x91d2e6d4cb5cf09430b041c93748cbc8cf0daf24921ff77fef8793502e7691a326856142023-01-20 20:32:1217 days 11 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d35275114.342855542136827166 CLV
0x1ad9c02db738530f924644094d9097fe8f743f5ec25e773dd5d2140567ab5f7926657702023-01-18 1:45:1220 days 6 hrs ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e0.004078425280527822 CLV
0x1ad9c02db738530f924644094d9097fe8f743f5ec25e773dd5d2140567ab5f7926657702023-01-18 1:45:1220 days 6 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.004078425280527822 CLV
0x7873aaf3dc3b22333dd476c64bcb5c5cf3b9ea79676e3bb0893f2723c79e817d26657012023-01-18 1:30:4820 days 6 hrs ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e4.163100928315629401 CLV
0x7873aaf3dc3b22333dd476c64bcb5c5cf3b9ea79676e3bb0893f2723c79e817d26657012023-01-18 1:30:4820 days 6 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352754.163100928315629401 CLV
0x4a983dc530546089675fcb4a310e84cce955658f0ba2466520dc8b3f2020b02e26002202023-01-08 21:08:1229 days 11 hrs ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e0.009264662840783375 CLV
0x4a983dc530546089675fcb4a310e84cce955658f0ba2466520dc8b3f2020b02e26002202023-01-08 21:08:1229 days 11 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.009264662840783375 CLV
0xb36c8b97fabb9ce9f59e4500e73b66951b06f8e3f3db31ab182f6787c2410f8326000742023-01-08 20:39:0029 days 11 hrs ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e5.867023807789053099 CLV
0xb36c8b97fabb9ce9f59e4500e73b66951b06f8e3f3db31ab182f6787c2410f8326000742023-01-08 20:39:0029 days 11 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352755.867023807789053099 CLV
0x3a631f8b267c3d6bbe06e344d5f1f3718dfd7205309d63822aaa9a809ff1fe9d25094912022-12-27 3:19:0642 days 5 hrs ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e0.006509096853641116 CLV
0x3a631f8b267c3d6bbe06e344d5f1f3718dfd7205309d63822aaa9a809ff1fe9d25094912022-12-27 3:19:0642 days 5 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.006509096853641116 CLV
0x0efc281d738cf607efc980bd6beea9f738418ded9588558b73627384202bd3e025093622022-12-27 2:53:1242 days 5 hrs ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e0.041886515878268595 CLV
0x0efc281d738cf607efc980bd6beea9f738418ded9588558b73627384202bd3e025093622022-12-27 2:53:1242 days 5 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.041886515878268595 CLV
0x3df13d3ca9c1a08527605f3ed0138e67667e72fcfec25908b23f7c57e72da35125077522022-12-26 21:27:4842 days 10 hrs ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e0.000025744631762918 CLV
0x3df13d3ca9c1a08527605f3ed0138e67667e72fcfec25908b23f7c57e72da35125077522022-12-26 21:27:4842 days 10 hrs ago 0x6d6ad95425fcf315c39fa6f3226471d4f16f27b3 0xddab2443e18b171077648254991f543413d352750.000025744631762918 CLV
0x5532b4c2932b36b10b6e0417f2abfe0e720007d4dddf4d71a62957ca395a8f7925077512022-12-26 21:27:3642 days 10 hrs ago 0xddab2443e18b171077648254991f543413d352750xce4078281de3c1b3f493743b6322a38325b7503e1.486014946163491035 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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