CODEWITHSUNDEEP
pythonethereumpython-3.7smartcontractsweb3py
giacomomaraglino
giacomomaraglino

Reputation: 345

web3 ABI doesn't work to get contract ownership on Ethereum mainnet

I'm working on python with web3 APIs. I'm trying to get the ownership of contract deployed on ethereum mainnet. The best code I could text was the following:

from web3 import Web3

eth = "https://mainnet.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161"
web3 = Web3(Web3.HTTPProvider(eth))

abi = '''[
    {
      "constant": true,
      "inputs": [],
      "name": "owner",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "type": "function"
    },
    {
      "inputs": [],
      "payable": false,
      "type": "constructor"
    }
]'''

contract = web3.eth.contract(address=Web3.toChecksumAddress("0x95aD61b0a150d79219dCF64E1E6Cc01f0B64C4cE"), abi=abi)
owner = contract.functions.owner().call()

print(owner)

But if I try to execute the code I get the following error:

web3.exceptions.ContractLogicError: execution reverted

Maybe ABI doesn't work for this RPC, or idk what occurs.

Upvotes: 0

Views: 1013

Answers (1)

Petr Hejda
Petr Hejda

Reputation: 43491

The queried contract (source code) doesn't have the owner() function (nor public property owner that would autogenerate the getter function).

When you're trying to call a non-existing function, the EVM then tries to call the fallback() (docs). But it's not there either, so the call fails.

A contract doesn't have to have an owner. It's "just" a widely used pattern, described and implemented by OpenZeppelin and other open-source library authors.

Upvotes: 1

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