阅读USD0合约代码时，找不到写入 Usd0StorageV0 的地方？ | 登链社区

本人初学者，在看 USD0 合约的代码：
https://etherscan.io/token/0x73a15fed60bf67631dc6cd7bc5b6e8da8190acf5#readProxyContract

这个代码中定义了 Usd0StorageV0 的结构如下：

    struct Usd0StorageV0 {
        IRegistryAccess registryAccess;
        mapping(address => bool) isBlacklisted;
        IRegistryContract registryContract;
        ITokenMapping tokenMapping;
    }

代码有有多处通过以下函数读取存储的 Usd0StorageV0

    function _usd0StorageV0() internal pure returns (Usd0StorageV0 storage $) {
       bytes32 position = Usd0StorageV0Location;
       // solhint-disable-next-line no-inline-assembly
       assembly {
           $.slot := position
       }
   }

但是找不到这个存储写入的地方，我想找到这个 struct 中关于 registryAccess registryContract的实现

求解答~

1 个回答

0xBA 2024-12-23 18:34

搜索registry可以发现


pragma solidity 0.8.20;

import {IRegistryAccess} from "src/interfaces/registry/IRegistryAccess.sol";

import {NotAuthorized} from "src/errors.sol";

/// @title Check Access control library
library CheckAccessControl {
    /// @dev Function to restrict to one access role.
    /// @param registryAccess The registry access contract.
    /// @param role The role being checked.
    function onlyMatchingRole(IRegistryAccess registryAccess, bytes32 role) internal view {
        if (!registryAccess.hasRole(role, msg.sender)) {
            revert NotAuthorized();
        }
    }
}

接着

// SPDX-License-Identifier: Apache-2.0

pragma solidity 0.8.20;

import {IAccessControlDefaultAdminRules} from
    "openzeppelin-contracts/access/extensions/IAccessControlDefaultAdminRules.sol";

// solhint-disable-next-line no-empty-blocks
interface IRegistryAccess is IAccessControlDefaultAdminRules {}

通过2个导入语句，可以确认是通过OpenZeppelin标准库实现的

5 阅读USD0合约代码时，找不到写入 Usd0StorageV0 的地方？

1 个回答