// SPDX-License-Identifier: MIT pragma solidity ^0.8.24; import {StorageSlot} from "./StorageSlot.sol"; /** * @dev Variant of {ReentrancyGuard} that uses transient storage. * * NOTE: This variant only works on networks where EIP-1153 is available. */ abstract contract ReentrancyGuardTransient { using StorageSlot for *; // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.ReentrancyGuard")) - 1)) & ~bytes32(uint256(0xff)) bytes32 private constant REENTRANCY_GUARD_STORAGE = 0x9b779b17422d0df92223018b32b4d1fa46e071723d6817e2486d003becc55f00; /** * @dev Unauthorized reentrant call. */ error ReentrancyGuardReentrantCall(); /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { _nonReentrantBefore(); _; _nonReentrantAfter(); } function _nonReentrantBefore() private { // On the first call to nonReentrant, _status will be NOT_ENTERED if (_reentrancyGuardEntered()) { revert ReentrancyGuardReentrantCall(); } // Any calls to nonReentrant after this point will fail REENTRANCY_GUARD_STORAGE.asBoolean().tstore(true); } function _nonReentrantAfter() private { REENTRANCY_GUARD_STORAGE.asBoolean().tstore(false); } /** * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a * `nonReentrant` function in the call stack. */ function _reentrancyGuardEntered() internal view returns (bool) { return REENTRANCY_GUARD_STORAGE.asBoolean().tload(); } }