Value HexBytes(*hex string*) 为 97 字节，但在使用 Contract.transact() 时应为 32

Posted 2023-02-18

【中文标题】Value HexBytes(*hex string*) 为 97 字节，但在使用 Contract.transact() 时应为 32

【英文标题】：The Value HexBytes(*hex string*) is 97 bytes but should be 32 when using Contract.transact()

【发布时间】：2018-04-18 04:42:57

【问题描述】：

我做了一个简单的智能合约如下

pragma solidity ^0.4.15;

contract ECDS 

Computer[] public computer;

event gotComputers(string _msg);
event addedComputer(string _msg, uint _cores, uint _cache, uint _coresVM, bool _mining);

struct Computer 
    uint cores;
    uint cache;
    uint coresVM;
    bool mining;


function addComputer(uint _cores, uint _cache, uint _coresVM, bool _mining) returns (bool success)
    Computer memory newComputer;

    newComputer.cores = _cores;
    newComputer.cache = _cache;
    newComputer.coresVM = _coresVM;
    newComputer.mining = _mining;

    computer.push(newComputer);
    addedComputer("A computer was added", _cores, _cache, _coresVM, _mining);
    return true;   


function getComputer() constant returns (uint[],uint[],uint[],bool[])
    uint length = computer.length;

    uint[] memory coresList = new uint[](length);
    uint[] memory cacheList = new uint[](length);
    uint[] memory coresVMList = new uint[](length);
    bool[] memory miningList = new bool[](length);

    for(uint i = 0; i < length; i++)
        Computer memory currentComputer;
        currentComputer = computer[i];

        coresList[i] = currentComputer.cores;
        cacheList[i] = currentComputer.cache;
        coresVMList[i] = currentComputer.coresVM;
        miningList[i] = currentComputer.mining;
    

    gotComputers("Got the list of computers");
    return (coresList, cacheList, coresVMList, miningList);


function availableFreeCores() constant returns (uint[])
    uint length = computer.length;

    uint[] memory freeCoresList = new uint[](length);
    for(uint i = 0; i < length; i++)
        Computer memory currentComputer;
        currentComputer = computer[i];

        uint freeCores = currentComputer.cores - (currentComputer.cache / 2);

        freeCoresList[i] = freeCores;
    
    return freeCoresList;

然后我在 python 程序中成功使用了 call().getComputer()，但是在使用 transact().addComputer(cores, cache, coresVM, True) 时出现错误。 Python 如下所示。

from web3 import Web3, HTTPProvider, IPCProvider
import json

contractAdress = '0x2343A6d7c85Ab43f94E50C128A7d3109A3647a1D'
web3 = Web3(HTTPProvider('52.169.42.101:30303'))
with open('factory.json', 'r') as abi_definition:
    abi = json.load(abi_definition)
web3 = Web3(IPCProvider())

fContract = web3.eth.contract(contractAdress, abi=abi)
cores = 12
cache = 15
coresVM = 0
mining = True
fContract.transact().addComputer(cores, cache, coresVM, True)
print('Computers',fContract.call().getComputer())

如果我注释掉 transact().addComputer，它会成功运行并返回正确的值。但是将它包含在程序中，我得到的完整错误是：

 Traceback (most recent call last):
 File "ECDS.py", line 15, in <module>
fContract.transact().addComputer(cores, cache, coresVM, True)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/contract.py", line 821, in transact_with_contract_function
txn_hash = contract.web3.eth.sendTransaction(transact_transaction)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/eth.py", line 211, in sendTransaction
get_buffered_gas_estimate(self.web3, transaction),
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/utils/transactions.py", line 160, in get_buffered_gas_estimate
gas_limit = get_block_gas_limit(web3)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/utils/transactions.py", line 151, in get_block_gas_limit
block = web3.eth.getBlock(block_identifier)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/eth.py", line 127, in getBlock
[block_identifier, full_transactions],
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/manager.py", line 74, in request_blocking
response = self._make_request(method, params)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/manager.py", line 57, in _make_request
return request_func(method, params)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/middleware/attrdict.py", line 20, in middleware
response = make_request(method, params)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/middleware/formatting.py", line 32, in middleware
formatter(response['result']),
 File "cytoolz/functoolz.pyx", line 232, in cytoolz.functoolz.curry.__call__ (cytoolz/functoolz.c:3996)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/utils/formatters.py", line 62, in apply_formatter_if
return formatter(value)
 File "cytoolz/functoolz.pyx", line 232, in cytoolz.functoolz.curry.__call__ (cytoolz/functoolz.c:3996)
 File "/usr/local/lib/python3.5/dist-packages/ethereum_utils-0.5.1-py3.5.egg/eth_utils/functional.py", line 33, in inner
return callback(fn(*args, **kwargs))
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/utils/formatters.py", line 72, in apply_formatters_to_dict
yield key, formatters[key](item)
 File "cytoolz/functoolz.pyx", line 232, in cytoolz.functoolz.curry.__call__ (cytoolz/functoolz.c:3996)
 File "/usr/local/lib/python3.5/dist-packages/web3-3.16.1-py3.5.egg/web3/middleware/pythonic.py", line 111, in to_hexbytes
result, len(result), num_bytes
ValueError: The value HexBytes('0xd783010703846765746887676f312e392e31856c696e7578000000000000000019905343b07339c85f1797c521d65dc9238743fdc52261c5ee4a4bd39004426e4b06c492df58bfbb037151d294187535732d23b5c768a83f452ceda2d5b6128400') is 97 bytes, but should be 32

我尝试将 Hex 解码为 ascii，我发现它与 geth go 客户端有关，但我还没有找到修复错误的方法。任何帮助或建议尝试将不胜感激！

【问题讨论】：

你在哪个网络，主网？您从源代码安装了 web3.py；你在哪个承诺上？ （处于 alpha 状态）你能打印出web3.manager.request_blocking('eth_getBlockByNumber', ['latest', False]) 的结果吗？

我在 rinkeby 网络上。我正在进行 10 月 30 日的最新提交。我做了一个小python程序只是为了尝试.request_blocking并得到'Request for id:eth_getBlockByNumber not found'

我在 Ubuntu 上使用以太坊钱包部署了合约，并安装了 geth。我正在考虑做一个干净的虚拟机并尝试重新从头开始构建所有内容，而不是使用以太坊钱包来查看是否可以解决问题

'Request for id:eth_getBlockByNumber not found' 是一个非常奇怪的错误，可能来自连接到损坏的客户端。我注意到您在上面创建了两次web3。您是否可能连接到与您打算不同的客户端？ IPCProvider 不带参数尝试连接到 go-ethereum (geth) 客户端——尽管一些备用客户端会创建一个 IPC 连接文件，geth 通常会将其放置在其中以保持兼容。重新安装好运吗？

全新重新安装似乎已经做到了。我用 ropsten 网络而不是 rinkeby 做了一个新的虚拟机，它工作正常。仍然有另一个 VM，并且已经玩过几次，但仍然没有任何工作。倾向于它是一种安装，但在某种程度上，但谁知道呢。

【参考方案1】：

这似乎是节点安装或启动时出现的错误，其中某些东西运行不正确。我最终重新安装了所有相关组件，现在它似乎可以正常工作了！