1、创建两个文件UUPSV1和UUPSV2// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.28; import "@openzeppelin/contracts/proxy/utils/UUPSUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; contract UUPSV1 is Initializable, UUPSUpgradeable, OwnableUpgradeable { uint public x; function _authorizeUpgrade(address implementation) internal override {} function initialize(uint _var) external initializer { x = _var; __Ownable_init(msg.sender); } function cal() ex...

1、创建两个文件UUPSV1和UUPSV2// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.28; import "@openzeppelin/contracts/proxy/utils/UUPSUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; contract UUPSV1 is Initializable, UUPSUpgradeable, OwnableUpgradeable { uint public x; function _authorizeUpgrade(address implementation) internal override {} function initialize(uint _var) external initializer { x = _var; __Ownable_init(msg.sender); } function cal() ex...

1、首先安装npm包 yarn add @openzeppelin/hardhat-upgrades 2、hardhat.config.ts文件中添加配置：import "@openzeppelin/hardhat-upgrades"; 2、两个基本合约如下：// BoxV1 // SPDX-License-Identifier: MIT pragma solidity ^0.8.28; import "@openzeppelin/contracts/proxy/utils/Initializable.sol"; contract BoxV1 is Initializable { uint public x; function initialize(uint _val) external initializer { x = _val; } function cal() external { x = x + 1; } } // BoxV2 // SPDX-License-Identifier: MIT pragma solidity ^0.8.28; import "@openze...

1、首先安装npm包 yarn add @openzeppelin/hardhat-upgrades 2、hardhat.config.ts文件中添加配置：import "@openzeppelin/hardhat-upgrades"; 2、两个基本合约如下：// BoxV1 // SPDX-License-Identifier: MIT pragma solidity ^0.8.28; import "@openzeppelin/contracts/proxy/utils/Initializable.sol"; contract BoxV1 is Initializable { uint public x; function initialize(uint _val) external initializer { x = _val; } function cal() external { x = x + 1; } } // BoxV2 // SPDX-License-Identifier: MIT pragma solidity ^0.8.28; import "@openze...

看了uniswap v2 很多遍，对于其中代码的熟悉程度在慢慢提高，因此做了些笔记来记录其中的要点： factory合约的作用：创建代币对createPair： 通过使用salt方式，通过create2方法对生成代币对地址，同时还初始化了代币对合约。对代币对进行排序： (address token0, address token1) = tokenA

看了uniswap v2 很多遍，对于其中代码的熟悉程度在慢慢提高，因此做了些笔记来记录其中的要点： factory合约的作用：创建代币对createPair： 通过使用salt方式，通过create2方法对生成代币对地址，同时还初始化了代币对合约。对代币对进行排序： (address token0, address token1) = tokenA

// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract AbiDecode{ struct MyStruct { string name; uint[] nums; } function encode( uint x, address addr, uint[] calldata arr, MyStruct calldata myStruct ) external pure returns(bytes memory){ return abi.encode(x,addr,arr,myStruct); } function decode(bytes calldata data) external pure returns( uint x, address addr, uint[] memory arr, MyStruct memory myStruct ) { (x,addr,arr,myStruct) = abi.decode(data, (uint, address, uint[], MyStruc...

// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract AbiDecode{ struct MyStruct { string name; uint[] nums; } function encode( uint x, address addr, uint[] calldata arr, MyStruct calldata myStruct ) external pure returns(bytes memory){ return abi.encode(x,addr,arr,myStruct); } function decode(bytes calldata data) external pure returns( uint x, address addr, uint[] memory arr, MyStruct memory myStruct ) { (x,addr,arr,myStruct) = abi.decode(data, (uint, address, uint[], MyStruc...

// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract MultiDelegateCall{ error DelegatecallFailed(); function multiDelegatecall(bytes[] calldata data) external payable returns(bytes[] memory results){ results = new bytesUnsupported embed; for(uint i; i<data.length; i++){ (bool ok, bytes memory res) = address(this).delegatecall(data[i]); if (!ok){ revert DelegatecallFailed(); } results[i] = res; } } } contract TestMultiDelegatecall is MultiDelegateCall{ event Log(address c...

// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract MultiDelegateCall{ error DelegatecallFailed(); function multiDelegatecall(bytes[] calldata data) external payable returns(bytes[] memory results){ results = new bytesUnsupported embed; for(uint i; i<data.length; i++){ (bool ok, bytes memory res) = address(this).delegatecall(data[i]); if (!ok){ revert DelegatecallFailed(); } results[i] = res; } } } contract TestMultiDelegatecall is MultiDelegateCall{ event Log(address c...

// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract DeployWithCreate2 { address public owner; constructor(address _owner){ owner = _owner; } } contract Create2Factory { event Deploy(address addr); function deploy(uint _salt) external { DeployWithCreate2 _contract = new DeployWithCreate2{ salt: bytes32(_salt) }(msg.sender); emit Deploy(address(_contract)); } function getAddress(bytes memory bytecode, uint _salt) public view returns(address){ bytes32 hash = keccak256( abi.enco...

// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract DeployWithCreate2 { address public owner; constructor(address _owner){ owner = _owner; } } contract Create2Factory { event Deploy(address addr); function deploy(uint _salt) external { DeployWithCreate2 _contract = new DeployWithCreate2{ salt: bytes32(_salt) }(msg.sender); emit Deploy(address(_contract)); } function getAddress(bytes memory bytecode, uint _salt) public view returns(address){ bytes32 hash = keccak256( abi.enco...

多重调用多重调用 实现的效果是同一个合约地址在tong'yi// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract TestMultiCall { function func1() external view returns(uint, uint){ return (1, block.timestamp); } function func2() external view returns(uint, uint){ return (2, block.timestamp); } function getData1() external pure returns (bytes memory){ return abi.encodeWithSelector(this.func1.selector); } function getData2() external pure returns (bytes memory){ return abi.encodeWithSelector(this.func2...

多重调用多重调用 实现的效果是同一个合约地址在tong'yi// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract TestMultiCall { function func1() external view returns(uint, uint){ return (1, block.timestamp); } function func2() external view returns(uint, uint){ return (2, block.timestamp); } function getData1() external pure returns (bytes memory){ return abi.encodeWithSelector(this.func1.selector); } function getData2() external pure returns (bytes memory){ return abi.encodeWithSelector(this.func2...

// SPDX-License-Identifier: MIT pragma solidity ^0.8.21; import "./IERC20.sol"; contract CrowdFund { struct Campaign{ address creator; uint goal; uint pledged; uint32 startAt; uint32 endAt; bool claimed; } IERC20 public immutable token; uint public count; mapping(uint => Campaign) public campaigns; mapping(uint => mapping(address => uint)) public pledgedAmount; event Launch(uint id, address indexed creator, uint goal, uint32 startAt, uint32 endAt); event Cancel(uint id); event Pledge(uint ind...

// SPDX-License-Identifier: MIT pragma solidity ^0.8.21; import "./IERC20.sol"; contract CrowdFund { struct Campaign{ address creator; uint goal; uint pledged; uint32 startAt; uint32 endAt; bool claimed; } IERC20 public immutable token; uint public count; mapping(uint => Campaign) public campaigns; mapping(uint => mapping(address => uint)) public pledgedAmount; event Launch(uint id, address indexed creator, uint goal, uint32 startAt, uint32 endAt); event Cancel(uint id); event Pledge(uint ind...

多签签名就是多人授权转账，需要达到要求的数量才能转账的审查。// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract MultiSigWallet { event Deposit(address indexed sender, uint amount); event Submit(uint indexed txId); event Approve(address indexed owner, uint indexed txId); event Revoke(address indexed owner, uint indexed txId); event Execute(uint indexed txId); struct Transaction{ address to; uint value; bytes data; bool executed; } modifier onlyOwner { require(isOwner[msg.sender],"not owner"); _; } modifie...

多签签名就是多人授权转账，需要达到要求的数量才能转账的审查。// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract MultiSigWallet { event Deposit(address indexed sender, uint amount); event Submit(uint indexed txId); event Approve(address indexed owner, uint indexed txId); event Revoke(address indexed owner, uint indexed txId); event Execute(uint indexed txId); struct Transaction{ address to; uint value; bytes data; bool executed; } modifier onlyOwner { require(isOwner[msg.sender],"not owner"); _; } modifie...

权限控制，其本质是对一个mapping状态变量进行修改。// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract AccessPermissions{ // 授权 event GrantRole(bytes32 indexed role, address indexed account); // 撤销 event RevokeRole(bytes32 indexed role, address indexed account); // role => account => bool mapping (bytes32 => mapping (address => bool)) public roles; // 定义角色 // 0xdf8b4c520ffe197c5343c6f5aec59570151ef9a492f2c624fd45ddde6135ec42 bytes32 private constant ADMIN = keccak256(abi.encodePacked("ADMIN")); //...

权限控制，其本质是对一个mapping状态变量进行修改。// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract AccessPermissions{ // 授权 event GrantRole(bytes32 indexed role, address indexed account); // 撤销 event RevokeRole(bytes32 indexed role, address indexed account); // role => account => bool mapping (bytes32 => mapping (address => bool)) public roles; // 定义角色 // 0xdf8b4c520ffe197c5343c6f5aec59570151ef9a492f2c624fd45ddde6135ec42 bytes32 private constant ADMIN = keccak256(abi.encodePacked("ADMIN")); //...

验证签名的步骤： 1、 将消息message 转换成 sign 2、对message进行hash处理 3、sign(hash(message), private key) | offchain 4、ecrecover(hash(message), signature ) == signer// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.13; contract VerifySig{ function verify(address _signer, string memory _message, bytes memory _sig) external pure returns(bool){ bytes32 messageHash = getMessageHash(_message); bytes32 ethSignedMessageHash = getEthSignedMessageHash(messageHash); return recover(ethSignedMessageHash, _sig) == ...

验证签名的步骤： 1、 将消息message 转换成 sign 2、对message进行hash处理 3、sign(hash(message), private key) | offchain 4、ecrecover(hash(message), signature ) == signer// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.13; contract VerifySig{ function verify(address _signer, string memory _message, bytes memory _sig) external pure returns(bool){ bytes32 messageHash = getMessageHash(_message); bytes32 ethSignedMessageHash = getEthSignedMessageHash(messageHash); return recover(ethSignedMessageHash, _sig) == ...

// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract Account{ address public bank; address public owner; constructor(address _owner) payable{ bank = msg.sender; owner = _owner; } } contract AccountFactory{ Account[] public accounts; function createAccount(address _owner) external payable{ Account account = new Account{value: 111}(_owner); accounts.push(account); } } 通过工厂合约地址创建账户合约

// SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.30; contract Account{ address public bank; address public owner; constructor(address _owner) payable{ bank = msg.sender; owner = _owner; } } contract AccountFactory{ Account[] public accounts; function createAccount(address _owner) external payable{ Account account = new Account{value: 111}(_owner); accounts.push(account); } } 通过工厂合约地址创建账户合约