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August 19, 2022 10:04
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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.16+commit.07a7930e.js&optimize=false&runs=200&gist=
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.15; | |
contract ContractFactory { | |
function deploy(uint256 n_, bytes calldata code_) external payable returns (address) { | |
Proxy p; | |
try new Proxy{salt: bytes32(n_)}() returns (Proxy _p) { | |
p = _p; | |
} catch { | |
revert("Deploy proxy failed"); | |
} | |
(bool ok, bytes memory ret) = address(p).call{value: msg.value}(code_); | |
require(ok, "Deploy failed"); | |
(address target) = abi.decode(ret, (address)); | |
return target; | |
} | |
function kill(uint256 n_) external payable { | |
Proxy p = getProxy(n_); | |
p.kill(); | |
} | |
function getProxy(uint256 n_) public view returns (Proxy) { | |
address predictedAddress = address(uint160(uint(keccak256(abi.encodePacked( | |
bytes1(0xff), | |
address(this), | |
bytes32(n_), | |
keccak256(abi.encodePacked( | |
type(Proxy).creationCode | |
)) | |
))))); | |
return Proxy(payable(predictedAddress)); | |
} | |
} | |
abstract contract Replaceable { | |
function kill() external { | |
selfdestruct(payable(msg.sender)); | |
} | |
} | |
contract Proxy { | |
Replaceable public target; | |
fallback(bytes calldata code_) external payable returns (bytes memory) { | |
require(address(target) == address(0), "Dirty"); | |
bytes memory code = code_; | |
address deployedAddress; | |
assembly { | |
deployedAddress := create(callvalue(), add(code, 0x20), mload(code)) | |
if iszero(extcodesize(deployedAddress)) {revert(0, 0)} | |
} | |
target = Replaceable(deployedAddress); | |
return abi.encode(deployedAddress); | |
} | |
function kill() external { | |
target.kill(); | |
selfdestruct(payable(msg.sender)); | |
} | |
} | |
contract Foo1 is Replaceable { | |
uint256 public n; | |
constructor(uint256 n_) { | |
n = n_; | |
} | |
function bar() external pure returns (uint256) { | |
return 100; | |
} | |
function set(uint256 n_) external returns (uint256) { | |
n = n_; | |
return n; | |
} | |
} | |
contract Foo2 is Replaceable { | |
uint256 public n; | |
string public s; | |
function bar() external pure returns (string memory) { | |
return "here"; | |
} | |
function set(string calldata s_) external returns (string memory) { | |
s = s_; | |
return s; | |
} | |
} |
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