Contract

// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;

import {BFacetOwner} from "./base/BFacetOwner.sol";
import {LibConcurrentCanExec} from "../libraries/LibConcurrentCanExec.sol";

contract ConcurrentCanExecFacet is BFacetOwner {
    function setSlotLength(uint256 _slotLength) external onlyOwner {
        LibConcurrentCanExec.setSlotLength(_slotLength);
    }

    function slotLength() external view returns (uint256) {
        return LibConcurrentCanExec.slotLength();
    }

    function concurrentCanExec(uint256 _buffer) external view returns (bool) {
        return LibConcurrentCanExec.concurrentCanExec(_buffer);
    }

    function getCurrentExecutorIndex()
        external
        view
        returns (uint256 executorIndex, uint256 remainingBlocksInSlot)
    {
        return LibConcurrentCanExec.getCurrentExecutorIndex();
    }

    function currentExecutor()
        external
        view
        returns (
            address executor,
            uint256 executorIndex,
            uint256 remainingBlocksInSlot
        )
    {
        return LibConcurrentCanExec.currentExecutor();
    }

    function mySlotStatus(uint256 _buffer)
        external
        view
        returns (LibConcurrentCanExec.SlotStatus)
    {
        return LibConcurrentCanExec.mySlotStatus(_buffer);
    }

    function calcExecutorIndex(
        uint256 _currentBlock,
        uint256 _blocksPerSlot,
        uint256 _numberOfExecutors
    )
        external
        pure
        returns (uint256 executorIndex, uint256 remainingBlocksInSlot)
    {
        return
            LibConcurrentCanExec.calcExecutorIndex(
                _currentBlock,
                _blocksPerSlot,
                _numberOfExecutors
            );
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;

import {LibDiamond} from "../../libraries/standard/LibDiamond.sol";

abstract contract BFacetOwner {
    modifier onlyOwner() {
        LibDiamond.enforceIsContractOwner();
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;

/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamond Standard: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

interface IDiamondCut {
    enum FacetCutAction {Add, Replace, Remove}
    // Add=0, Replace=1, Remove=2

    struct FacetCut {
        address facetAddress;
        FacetCutAction action;
        bytes4[] functionSelectors;
    }

    event DiamondCut(FacetCut[] _diamondCut, address _init, bytes _calldata);

    /// @notice Add/replace/remove any number of functions and optionally execute
    ///         a function with delegatecall
    /// @param _diamondCut Contains the facet addresses and function selectors
    /// @param _init The address of the contract or facet to execute _calldata
    /// @param _calldata A function call, including function selector and arguments
    ///                  _calldata is executed with delegatecall on _init
    function diamondCut(
        FacetCut[] calldata _diamondCut,
        address _init,
        bytes calldata _calldata
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;

import {LibExecutor} from "./LibExecutor.sol";

library LibConcurrentCanExec {
    using LibExecutor for address;

    enum SlotStatus {Open, Closing, Closed}

    struct ConcurrentExecStorage {
        uint256 slotLength;
    }

    bytes32 private constant _CONCURRENT_EXEC_STORAGE_POSITION =
        keccak256("gelato.diamond.concurrentexec.storage");

    function setSlotLength(uint256 _slotLength) internal {
        concurrentExecStorage().slotLength = _slotLength;
    }

    function slotLength() internal view returns (uint256) {
        return concurrentExecStorage().slotLength;
    }

    function concurrentCanExec(uint256 _buffer) internal view returns (bool) {
        return
            msg.sender.canExec() && LibExecutor.numberOfExecutors() == 1
                ? true
                : mySlotStatus(_buffer) == LibConcurrentCanExec.SlotStatus.Open;
    }

    function getCurrentExecutorIndex()
        internal
        view
        returns (uint256 executorIndex, uint256 remainingBlocksInSlot)
    {
        uint256 numberOfExecutors = LibExecutor.numberOfExecutors();
        uint256 currentSlotLength = slotLength();
        require(
            numberOfExecutors > 0,
            "LibConcurrentCanExec.getCurrentExecutorIndex: 0 executors"
        );
        require(
            currentSlotLength > 0,
            "LibConcurrentCanExec.getCurrentExecutorIndex: 0 slotLength"
        );

        return
            calcExecutorIndex(
                block.number,
                currentSlotLength,
                numberOfExecutors
            );
    }

    function currentExecutor()
        internal
        view
        returns (
            address executor,
            uint256 executorIndex,
            uint256 remainingBlocksInSlot
        )
    {
        (executorIndex, remainingBlocksInSlot) = getCurrentExecutorIndex();
        executor = LibExecutor.executorAt(executorIndex);
    }

    function mySlotStatus(uint256 _buffer) internal view returns (SlotStatus) {
        (uint256 executorIndex, uint256 remainingBlocksInSlot) =
            getCurrentExecutorIndex();

        address executor = LibExecutor.executorAt(executorIndex);

        if (msg.sender != executor) return SlotStatus.Closed;

        return
            remainingBlocksInSlot <= _buffer
                ? SlotStatus.Closing
                : SlotStatus.Open;
    }

    // Example: blocksPerSlot = 3, numberOfExecutors = 2
    //
    // Block number          0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ...
    //                      ---------------------------------------------
    // slotIndex             0 | 0 | 0 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | ...
    //                      ---------------------------------------------
    // executorIndex         0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | ...
    // remainingBlocksInSlot 2 | 1 | 0 | 2 | 1 | 0 | 2 | 1 | 0 | 2 | ...
    //

    function calcExecutorIndex(
        uint256 _currentBlock,
        uint256 _blocksPerSlot,
        uint256 _numberOfExecutors
    )
        internal
        pure
        returns (uint256 executorIndex, uint256 remainingBlocksInSlot)
    {
        uint256 slotIndex = _currentBlock / _blocksPerSlot;
        return (
            slotIndex % _numberOfExecutors,
            (slotIndex + 1) * _blocksPerSlot - _currentBlock - 1
        );
    }

    function concurrentExecStorage()
        internal
        pure
        returns (ConcurrentExecStorage storage ces)
    {
        bytes32 position = _CONCURRENT_EXEC_STORAGE_POSITION;
        assembly {
            ces.slot := position
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;

import {
    EnumerableSet
} from "../../../vendor/openzeppelin/contracts/utils/EnumerableSet.sol";

library LibExecutor {
    using EnumerableSet for EnumerableSet.AddressSet;

    struct ExecutorStorage {
        EnumerableSet.AddressSet executors;
        uint256 gasMargin;
    }

    bytes32 private constant _EXECUTOR_STORAGE_POSITION =
        keccak256("gelato.diamond.executor.storage");

    function addExecutor(address _executor) internal returns (bool) {
        return executorStorage().executors.add(_executor);
    }

    function removeExecutor(address _executor) internal returns (bool) {
        return executorStorage().executors.remove(_executor);
    }

    function setGasMargin(uint256 _gasMargin) internal {
        executorStorage().gasMargin = _gasMargin;
    }

    function canExec(address _executor) internal view returns (bool) {
        return isExecutor(_executor);
    }

    function isExecutor(address _executor) internal view returns (bool) {
        return executorStorage().executors.contains(_executor);
    }

    function executorAt(uint256 _index) internal view returns (address) {
        return executorStorage().executors.at(_index);
    }

    function executors() internal view returns (address[] memory executors_) {
        uint256 length = numberOfExecutors();
        executors_ = new address[](length);
        for (uint256 i; i < length; i++) executors_[i] = executorAt(i);
    }

    function numberOfExecutors() internal view returns (uint256) {
        return executorStorage().executors.length();
    }

    function gasMargin() internal view returns (uint256) {
        return executorStorage().gasMargin;
    }

    function executorStorage()
        internal
        pure
        returns (ExecutorStorage storage es)
    {
        bytes32 position = _EXECUTOR_STORAGE_POSITION;
        assembly {
            es.slot := position
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;

// https://github.com/mudgen/diamond-3/blob/b009cd08b7822bad727bbcc47aa1b50d8b50f7f0/contracts/libraries/LibDiamond.sol#L1

/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamond Standard: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

import "../../interfaces/standard/IDiamondCut.sol";

// Custom due to incorrect string casting (non UTF-8 formatted)
import {GelatoBytes} from "../../../../lib/GelatoBytes.sol";

library LibDiamond {
    bytes32 constant DIAMOND_STORAGE_POSITION =
        keccak256("diamond.standard.diamond.storage");

    struct FacetAddressAndPosition {
        address facetAddress;
        uint16 functionSelectorPosition; // position in facetFunctionSelectors.functionSelectors array
    }

    struct FacetFunctionSelectors {
        bytes4[] functionSelectors;
        uint16 facetAddressPosition; // position of facetAddress in facetAddresses array
    }

    struct DiamondStorage {
        // maps function selector to the facet address and
        // the position of the selector in the facetFunctionSelectors.selectors array
        mapping(bytes4 => FacetAddressAndPosition) selectorToFacetAndPosition;
        // maps facet addresses to function selectors
        mapping(address => FacetFunctionSelectors) facetFunctionSelectors;
        // facet addresses
        address[] facetAddresses;
        // Used to query if a contract implements an interface.
        // Used to implement ERC-165.
        mapping(bytes4 => bool) supportedInterfaces;
        // owner of the contract
        address contractOwner;
    }

    function diamondStorage()
        internal
        pure
        returns (DiamondStorage storage ds)
    {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        assembly {
            ds.slot := position
        }
    }

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    function setContractOwner(address _newOwner) internal {
        DiamondStorage storage ds = diamondStorage();
        address previousOwner = ds.contractOwner;
        ds.contractOwner = _newOwner;
        emit OwnershipTransferred(previousOwner, _newOwner);
    }

    function contractOwner() internal view returns (address contractOwner_) {
        contractOwner_ = diamondStorage().contractOwner;
    }

    function isContractOwner(address _guy) internal view returns (bool) {
        return _guy == contractOwner();
    }

    function enforceIsContractOwner() internal view {
        require(
            msg.sender == diamondStorage().contractOwner,
            "LibDiamond: Must be contract owner"
        );
    }

    event DiamondCut(
        IDiamondCut.FacetCut[] _diamondCut,
        address _init,
        bytes _calldata
    );

    // Internal function version of diamondCut
    function diamondCut(
        IDiamondCut.FacetCut[] memory _diamondCut,
        address _init,
        bytes memory _calldata
    ) internal {
        for (
            uint256 facetIndex;
            facetIndex < _diamondCut.length;
            facetIndex++
        ) {
            IDiamondCut.FacetCutAction action = _diamondCut[facetIndex].action;
            if (action == IDiamondCut.FacetCutAction.Add) {
                addFunctions(
                    _diamondCut[facetIndex].facetAddress,
                    _diamondCut[facetIndex].functionSelectors
                );
            } else if (action == IDiamondCut.FacetCutAction.Replace) {
                replaceFunctions(
                    _diamondCut[facetIndex].facetAddress,
                    _diamondCut[facetIndex].functionSelectors
                );
            } else if (action == IDiamondCut.FacetCutAction.Remove) {
                removeFunctions(
                    _diamondCut[facetIndex].facetAddress,
                    _diamondCut[facetIndex].functionSelectors
                );
            } else {
                revert("LibDiamondCut: Incorrect FacetCutAction");
            }
        }
        emit DiamondCut(_diamondCut, _init, _calldata);
        initializeDiamondCut(_init, _calldata);
    }

    function addFunctions(
        address _facetAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        require(
            _functionSelectors.length > 0,
            "LibDiamondCut: No selectors in facet to cut"
        );
        DiamondStorage storage ds = diamondStorage();
        // uint16 selectorCount = uint16(diamondStorage().selectors.length);
        require(
            _facetAddress != address(0),
            "LibDiamondCut: Add facet can't be address(0)"
        );
        uint16 selectorPosition =
            uint16(
                ds.facetFunctionSelectors[_facetAddress]
                    .functionSelectors
                    .length
            );
        // add new facet address if it does not exist
        if (selectorPosition == 0) {
            enforceHasContractCode(
                _facetAddress,
                "LibDiamondCut: New facet has no code"
            );
            ds.facetFunctionSelectors[_facetAddress]
                .facetAddressPosition = uint16(ds.facetAddresses.length);
            ds.facetAddresses.push(_facetAddress);
        }
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress =
                ds.selectorToFacetAndPosition[selector].facetAddress;
            require(
                oldFacetAddress == address(0),
                "LibDiamondCut: Can't add function that already exists"
            );
            ds.facetFunctionSelectors[_facetAddress].functionSelectors.push(
                selector
            );
            ds.selectorToFacetAndPosition[selector]
                .facetAddress = _facetAddress;
            ds.selectorToFacetAndPosition[selector]
                .functionSelectorPosition = selectorPosition;
            selectorPosition++;
        }
    }

    function replaceFunctions(
        address _facetAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        require(
            _functionSelectors.length > 0,
            "LibDiamondCut: No selectors in facet to cut"
        );
        DiamondStorage storage ds = diamondStorage();
        require(
            _facetAddress != address(0),
            "LibDiamondCut: Add facet can't be address(0)"
        );
        uint16 selectorPosition =
            uint16(
                ds.facetFunctionSelectors[_facetAddress]
                    .functionSelectors
                    .length
            );
        // add new facet address if it does not exist
        if (selectorPosition == 0) {
            enforceHasContractCode(
                _facetAddress,
                "LibDiamondCut: New facet has no code"
            );
            ds.facetFunctionSelectors[_facetAddress]
                .facetAddressPosition = uint16(ds.facetAddresses.length);
            ds.facetAddresses.push(_facetAddress);
        }
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress =
                ds.selectorToFacetAndPosition[selector].facetAddress;
            require(
                oldFacetAddress != _facetAddress,
                "LibDiamondCut: Can't replace function with same function"
            );
            removeFunction(oldFacetAddress, selector);
            // add function
            ds.selectorToFacetAndPosition[selector]
                .functionSelectorPosition = selectorPosition;
            ds.facetFunctionSelectors[_facetAddress].functionSelectors.push(
                selector
            );
            ds.selectorToFacetAndPosition[selector]
                .facetAddress = _facetAddress;
            selectorPosition++;
        }
    }

    function removeFunctions(
        address _facetAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        require(
            _functionSelectors.length > 0,
            "LibDiamondCut: No selectors in facet to cut"
        );
        DiamondStorage storage ds = diamondStorage();
        // if function does not exist then do nothing and return
        require(
            _facetAddress == address(0),
            "LibDiamondCut: Remove facet address must be address(0)"
        );
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress =
                ds.selectorToFacetAndPosition[selector].facetAddress;
            removeFunction(oldFacetAddress, selector);
        }
    }

    function removeFunction(address _facetAddress, bytes4 _selector) internal {
        DiamondStorage storage ds = diamondStorage();
        require(
            _facetAddress != address(0),
            "LibDiamondCut: Can't remove function that doesn't exist"
        );
        // an immutable function is a function defined directly in a diamond
        require(
            _facetAddress != address(this),
            "LibDiamondCut: Can't remove immutable function"
        );
        // replace selector with last selector, then delete last selector
        uint256 selectorPosition =
            ds.selectorToFacetAndPosition[_selector].functionSelectorPosition;
        uint256 lastSelectorPosition =
            ds.facetFunctionSelectors[_facetAddress].functionSelectors.length -
                1;
        // if not the same then replace _selector with lastSelector
        if (selectorPosition != lastSelectorPosition) {
            bytes4 lastSelector =
                ds.facetFunctionSelectors[_facetAddress].functionSelectors[
                    lastSelectorPosition
                ];
            ds.facetFunctionSelectors[_facetAddress].functionSelectors[
                selectorPosition
            ] = lastSelector;
            ds.selectorToFacetAndPosition[lastSelector]
                .functionSelectorPosition = uint16(selectorPosition);
        }
        // delete the last selector
        ds.facetFunctionSelectors[_facetAddress].functionSelectors.pop();
        delete ds.selectorToFacetAndPosition[_selector];

        // if no more selectors for facet address then delete the facet address
        if (lastSelectorPosition == 0) {
            // replace facet address with last facet address and delete last facet address
            uint256 lastFacetAddressPosition = ds.facetAddresses.length - 1;
            uint256 facetAddressPosition =
                ds.facetFunctionSelectors[_facetAddress].facetAddressPosition;
            if (facetAddressPosition != lastFacetAddressPosition) {
                address lastFacetAddress =
                    ds.facetAddresses[lastFacetAddressPosition];
                ds.facetAddresses[facetAddressPosition] = lastFacetAddress;
                ds.facetFunctionSelectors[lastFacetAddress]
                    .facetAddressPosition = uint16(facetAddressPosition);
            }
            ds.facetAddresses.pop();
            delete ds.facetFunctionSelectors[_facetAddress]
                .facetAddressPosition;
        }
    }

    function initializeDiamondCut(address _init, bytes memory _calldata)
        internal
    {
        if (_init == address(0)) {
            require(
                _calldata.length == 0,
                "LibDiamondCut: _init is address(0) but_calldata is not empty"
            );
        } else {
            require(
                _calldata.length > 0,
                "LibDiamondCut: _calldata is empty but _init is not address(0)"
            );
            if (_init != address(this)) {
                enforceHasContractCode(
                    _init,
                    "LibDiamondCut: _init address has no code"
                );
            }
            (bool success, bytes memory error) = _init.delegatecall(_calldata);
            if (!success) {
                if (error.length > 0) {
                    // bubble up the error
                    GelatoBytes.revertWithError(error, "LibDiamondCut:_init:");
                } else {
                    revert("LibDiamondCut: _init function reverted");
                }
            }
        }
    }

    function enforceHasContractCode(
        address _contract,
        string memory _errorMessage
    ) internal view {
        uint256 contractSize;
        assembly {
            contractSize := extcodesize(_contract)
        }
        require(contractSize > 0, _errorMessage);
    }
}

// "SPDX-License-Identifier: UNLICENSED"
pragma solidity 0.8.0;

library GelatoBytes {
    function calldataSliceSelector(bytes calldata _bytes)
        internal
        pure
        returns (bytes4 selector)
    {
        selector =
            _bytes[0] |
            (bytes4(_bytes[1]) >> 8) |
            (bytes4(_bytes[2]) >> 16) |
            (bytes4(_bytes[3]) >> 24);
    }

    function memorySliceSelector(bytes memory _bytes)
        internal
        pure
        returns (bytes4 selector)
    {
        selector =
            _bytes[0] |
            (bytes4(_bytes[1]) >> 8) |
            (bytes4(_bytes[2]) >> 16) |
            (bytes4(_bytes[3]) >> 24);
    }

    function revertWithError(bytes memory _bytes, string memory _tracingInfo)
        internal
        pure
    {
        // 68: 32-location, 32-length, 4-ErrorSelector, UTF-8 err
        if (_bytes.length % 32 == 4) {
            bytes4 selector;
            assembly {
                selector := mload(add(0x20, _bytes))
            }
            if (selector == 0x08c379a0) {
                // Function selector for Error(string)
                assembly {
                    _bytes := add(_bytes, 68)
                }
                revert(string(abi.encodePacked(_tracingInfo, string(_bytes))));
            } else {
                revert(
                    string(abi.encodePacked(_tracingInfo, "NoErrorSelector"))
                );
            }
        } else {
            revert(
                string(abi.encodePacked(_tracingInfo, "UnexpectedReturndata"))
            );
        }
    }

    function returnError(bytes memory _bytes, string memory _tracingInfo)
        internal
        pure
        returns (string memory)
    {
        // 68: 32-location, 32-length, 4-ErrorSelector, UTF-8 err
        if (_bytes.length % 32 == 4) {
            bytes4 selector;
            assembly {
                selector := mload(add(0x20, _bytes))
            }
            if (selector == 0x08c379a0) {
                // Function selector for Error(string)
                assembly {
                    _bytes := add(_bytes, 68)
                }
                return string(abi.encodePacked(_tracingInfo, string(_bytes)));
            } else {
                return
                    string(abi.encodePacked(_tracingInfo, "NoErrorSelector"));
            }
        } else {
            return
                string(abi.encodePacked(_tracingInfo, "UnexpectedReturndata"));
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0;

/**
 * @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));
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"uint256","name":"_currentBlock","type":"uint256"},{"internalType":"uint256","name":"_blocksPerSlot","type":"uint256"},{"internalType":"uint256","name":"_numberOfExecutors","type":"uint256"}],"name":"calcExecutorIndex","outputs":[{"internalType":"uint256","name":"executorIndex","type":"uint256"},{"internalType":"uint256","name":"remainingBlocksInSlot","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"_buffer","type":"uint256"}],"name":"concurrentCanExec","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentExecutor","outputs":[{"internalType":"address","name":"executor","type":"address"},{"internalType":"uint256","name":"executorIndex","type":"uint256"},{"internalType":"uint256","name":"remainingBlocksInSlot","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCurrentExecutorIndex","outputs":[{"internalType":"uint256","name":"executorIndex","type":"uint256"},{"internalType":"uint256","name":"remainingBlocksInSlot","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_buffer","type":"uint256"}],"name":"mySlotStatus","outputs":[{"internalType":"enum LibConcurrentCanExec.SlotStatus","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_slotLength","type":"uint256"}],"name":"setSlotLength","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"slotLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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