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solidity ｜ 账户

发表于 更新于 分类于 ， ， ， ， Valine：

solidity 的账户概念。

账户由 20 个字节组成，一般分为外部账户「EOA」和合约账户 「CA」。

两类账户可以交互，但是，只能由外部账户发起，并且 gas 由外部账户支付。

合约无法自己执行或者定时自己执行。

合约区分外部账户还是合约账户

我根据上面的参考资料写了一个合约。

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pragma solidity ^0.8.0;

contract Test {

    constructor(
    ){}

    function isContract(address account) public view returns (bytes32) {
        bytes32 codehash;
        assembly {
            codehash := extcodehash(account)
        }
        return codehash;
    }

    function isContract2(address account) public view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        assembly {
            codehash := extcodehash(account)
        }
        return (codehash != accountHash && codehash != 0x0);
    }

    function isContract3(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    function isContract4(address addr) public view returns (bytes32) {
        bytes32 size;
        assembly {
            size := extcodehash(addr)
        }
        return size;
    }
}

我在 bsc 的测试网进行了部署。

然后用 web3.py 进行了测试。

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import time
from web3 import Web3

abi = """[
    {
      "inputs": [],
      "stateMutability": "nonpayable",
      "type": "constructor"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "account",
          "type": "address"
        }
      ],
      "name": "isContract",
      "outputs": [
        {
          "internalType": "bytes32",
          "name": "",
          "type": "bytes32"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "account",
          "type": "address"
        }
      ],
      "name": "isContract2",
      "outputs": [
        {
          "internalType": "bool",
          "name": "",
          "type": "bool"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "addr",
          "type": "address"
        }
      ],
      "name": "isContract4",
      "outputs": [
        {
          "internalType": "bytes32",
          "name": "",
          "type": "bytes32"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    }
  ]
"""

w3 = Web3(Web3.HTTPProvider("https://data-seed-prebsc-1-s1.binance.org:8545"))
pancakeswap = "0xC73269f2C709F0a69435cd3582C1F35dff0cb44C"
contractObj = w3.eth.contract(
    address=Web3.toChecksumAddress(pancakeswap), abi=abi)
data1 = contractObj.functions.isHuman(Web3.toChecksumAddress("0xeD47E52c570431cd2d45F63760661EaD68167f9D")).call()
data2 = contractObj.functions.isContract(Web3.toChecksumAddress("0xeD47E52c570431cd2d45F63760661EaD68167f9D")).call()
data3 = contractObj.functions.isContract2(Web3.toChecksumAddress("0xeD47E52c570431cd2d45F63760661EaD68167f9D")).call()

print(data1)
print(data2)
print(data3)
print(Web3.toText(data1))

感兴趣的可以自己找合约和普通账户测试一下。

ps: 为什么我要使用 测试网进行部署，而不是 ganache 进行本地模拟主网呢？

因为 ganache 非常不稳定，主要体现在

  • 调用方法，每次返回的值都不一样
    • 合约地址返回非合约地址的值
    • 部署同一份合约，然后查询同一个地址，返回的值都不一样
请我喝杯咖啡吧～