Question

我已经成功地将合同部署到了Kaleido，但是我在弄清楚如何正确验证合同方面遇到了麻烦。这是部署合同的源代码，我已经验证了最后一个打印语句打印的地址出现在我的Kaleido区块链中：

from web3 import Web3
from web3.providers import HTTPProvider
from solc import compile_source

# Solidity source code
contract_source_code = '''
pragma solidity ^0.4.0;

contract Greeter {
    string public greeting;

    function Greeter() {
        greeting = 'Hello';
    }

    function setGreeting(string _greeting) public {
        greeting = _greeting;
    }

    function greet() constant returns (string) {
        return greeting;
    }
}
'''

compiled_sol = compile_source(contract_source_code) # Compiled source code
contract_interface = compiled_sol[':Greeter']

w3 = Web3(HTTPProvider("https://XXXXX:YYYYY@ZZZZZZZ.kaleido.io"))

contract_ = w3.eth.contract(
    abi=contract_interface['abi'],
    bytecode=contract_interface['bin'])

# note: when interacting with kaleido, gasPrice MUST be 0 (I think because of the consensus algorithm I chose)
# and it seems it doesn't matter what account this is sent from
construct_txn = contract_.constructor().buildTransaction({
    'from': w3.eth.accounts[0],
    'gas': 1728712,
    'gasPrice': 0})
txn = w3.eth.sendTransaction(construct_txn)

tx_receipt = w3.eth.getTransactionReceipt(txn)
contract_address = tx_receipt['contractAddress']
print(contract_address)

当我尝试验证合同时，要求我提供源代码，合同名称，编译器版本以及是否使用了优化。

我将以下内容用作请求的源代码

pragma solidity ^0.4.0;

contract Greeter {
    string public greeting;

    function Greeter() {
        greeting = 'Hello';
    }

    function setGreeting(string _greeting) public {
        greeting = _greeting;
    }

    function greet() constant returns (string) {
        return greeting;
    }
}

我使用Greeter作为合同名称。 solc --version返回Version: 0.4.24+commit.e67f0147.Darwin.appleclang，我发现它是在5月16日提交的https://github.com/ethereum/solidity/search?q=e67f0147&type=Commits。

我尝试了以下所有组合来启用编译器版本+优化：{0.4.24，0.4.24-nightly.2018.5.16} x {已启用优化，已禁用优化}，但这些组合均无效。当我尝试0.4.24-nightly.2018.5.16时出现以下错误，因为未启用编译器和优化。

The compiled result does not match the input creation bytecode located at 0x4c94e89d5ec3125339906109f143673f40868df2.

 Compilation failed: ["Warning: This is a pre-release compiler version, please do not use it in production.\n",":6:5: Warning: Defining constructors as functions with the same name as the contract is deprecated. Use \"constructor(...) { ... }\" instead.\n function Greeter() {\n ^ (Relevant source part starts here and spans across multiple lines).\n",":6:5: Warning: No visibility specified. Defaulting to \"public\". \n function Greeter() {\n ^ (Relevant source part starts here and spans across multiple lines).\n",":14:5: Warning: No visibility specified. Defaulting to \"public\". \n function greet() constant returns (string) {\n ^ (Relevant source part starts here and spans across multiple lines).\n"] .

Answer 1

您不需要编译器参数即可验证合同。只有在极少数情况下，您才需要了解它们。我目前使用0.4.21编译器，并且能够仅使用合同Solidity源代码来验证我的合同。

我可能建议您指定您在合同实用程序中使用的特定编译器，而不是^ 0.4.0。

当我尝试进行验证时，我也在使用Geth PoA环境，并且必须对您的代码进行一些修改才能使其正常工作。您正在使用Quorum环境吗？哪个协议？

这是我的代码摘自自述文件中的“快速入门”示例：

import json
import web3

from web3 import Web3, HTTPProvider
from solc import compile_source
from web3.contract import ConciseContract
from web3.middleware import geth_poa_middleware

# Solidity source code
contract_source_code = '''
pragma solidity ^0.4.21;

contract Greeter {
    string public greeting;

    function Greeter() public {
        greeting = 'Hello';
    }

    function setGreeting(string _greeting) public {
        greeting = _greeting;
    }

    function greet() public returns (string) {
        return greeting;
    }
}
'''

compiled_sol = compile_source(contract_source_code) # Compiled source code
contract_interface = compiled_sol['<stdin>:Greeter']

# web3.py instance
w3 = Web3(HTTPProvider("https://YYY:ZZZ@XXXXXX.us-east-2.kaleido.io"))
w3.middleware_stack.inject(geth_poa_middleware, layer=0)

# set pre-funded account as sender
w3.eth.defaultAccount = w3.eth.accounts[0]

# Instantiate and deploy contract
Greeter = w3.eth.contract(abi=contract_interface['abi'], bytecode=contract_interface['bin'])

# Submit the transaction that deploys the contract
tx_hash = Greeter.constructor().transact()

# Wait for the transaction to be mined, and get the transaction receipt
tx_receipt = w3.eth.waitForTransactionReceipt(tx_hash)
print(tx_receipt.contractAddress)
# Create the contract instance with the newly-deployed address
greeter = w3.eth.contract(
    address=tx_receipt.contractAddress,
    abi=contract_interface['abi'],
)

# Display the default greeting from the contract
print('Default contract greeting: {}'.format(
    greeter.functions.greet().call()
))

print('Setting the greeting to Nihao...')
tx_hash = greeter.functions.setGreeting('Nihao').transact()
# Wait for transaction to be mined...
w3.eth.waitForTransactionReceipt(tx_hash)


# Display the new greeting value
print('Updated contract greeting: {}'.format(
    greeter.functions.greet().call()
))

# When issuing a lot of reads, try this more concise reader:
reader = ConciseContract(greeter)
assert reader.greet() == "Nihao"

如果您确实需要知道如何查找编译时参数，则通常将它们作为kwargs提供给编译函数。这是可以发挥作用的源代码行：https://github.com/ethereum/py-solc/blob/c595d84d9f0ef5f5da0a5d79e7d5fcabecfe5f06/solc/main.py#L106

如何确定正确的合同编制选项？

1 个答案: