我想测试一个简单的以太坊智能合约
ganache以小写形式打印帐户,而web3给我一个错误:
web3.exceptions.InvalidAddress :(“ Web3.py仅接受校验和地址。为您提供此非校验和地址的软件应视为不安全,请在其平台上将其归档为bug。请尝试使用ENS名称。或者,如果必须接受较低的安全性,请使用Web3.toChecksumAddress(lower_case_address)。','0xfcad0b19bb29d4674531d6f115237e16afce377c')
然后使用以下命令将地址转换为混合地址:
Web3.toChecksumAddress(the_lower_case_ganache_address)
它会引发一个错误:
在call_contract_function中的文件“ /usr/local/lib/python3.7/site-packages/web3/contract.py”,第1385行
从e引发BadFunctionCallOutput(msg)
web3.exceptions.BadFunctionCallOutput:无法与/调用合同功能进行交易,合同是否已正确部署且已同步链?
127.0.0.1--[2019年1月25日21:35:21]“ POST / blockchain / user HTTP / 1.1” 500-
这是我的python代码:
def check_gender(data):
valid_list = ["male", "female"]
if data not in valid_list:
raise ValidationError(
'Invalid gender. Valid choices are'+ valid_list
)
class UserSchema(Schema):
name = fields.String(required=True)
gender = fields.String(required=True, validate=check_gender)
app = Flask(__name__)
# api to set new user every api call
@app.route("/blockchain/user", methods=['POST'])
def transaction():
w3.eth.defaultAccount = w3.eth.accounts[0]
with open("data.json", 'r') as f:
datastore = json.load(f)
abi = datastore["abi"]
contract_address = datastore["contract_address"]
# Create the contract instance with the newly-deployed address
user = w3.eth.contract(
address=contract_address, abi=abi,
)
body = request.get_json()
result, error = UserSchema().load(body)
if error:
return jsonify(error), 422
tx_hash = user.functions.setUser(
result['name'], result['gender']
)
tx_hash = tx_hash.transact()
# Wait for transaction to be mined...
w3.eth.waitForTransactionReceipt(tx_hash)
user_data = user.functions.getUser().call()
return jsonify({"data": user_data}), 200
if __name__ == '__main__':
app.run()
`
和json文件:
{
"abi": [
{
"constant": false,
"inputs": [
{
"name": "name",
"type": "string"
},
{
"name": "gender",
"type": "string"
}
],
"name": "setUser",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [],
"name": "getUser",
"outputs": [
{
"name": "",
"type": "string"
},
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}
],
"contract_address": "0xFCAd0B19bB29D4674531d6f115237E16AfCE377c"
}
最佳答案
该错误表明Ganache找不到与之交互的已部署合同。
您的代码似乎有效,但此行上可能发生错误:
tx_hash = user.functions.setUser(
result['name'], result['gender']
)
该代码尝试设置用户,但找不到与之交互的合同(即使ABI和合同实例有效)。
如果您使用的是Ganache,则很可能在每次运行代码时都重新部署合同,因此,如果从静态文件中提取代码,则以下行可能无法正常工作:
contract_address = datastore["contract_address"]
如果您每次都部署它,则需要从Ganache动态获取合同地址。
关于python - 在python中与ganache-cli同步,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/54370707/