Add support for custom errors or provide full RPC response if transaction is reverted

[Shchepetov]

• Version: 6.0.0b9
• Python: 3.10.9
• OS: osx

What was wrong?

I need to call a contract method and get revert data

from web3 import Web3
w3 = Web3(Web3.HTTPProvider("https://eth-goerli.public.blastapi.io"))
contract = w3.eth.contract(address=address, abi=abi)
contract.functions.alwaysReverts().call()

Unfortunately the exception raised with call() method provides no information about triggered custom error and the data passed as the error parameters:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  ...
    File "/Users/alexander/Desktop/FastAPI/venv/lib/python3.10/site-packages/web3/_utils/method_formatters.py", line 636, in     raise_solidity_error_on_revert
    raise ContractLogicError(response["error"]["message"])
web3.exceptions.ContractLogicError: execution reverted

If we look at the variable response used to raise the exception, we see that this data is contained in response["error"]["data"]

>>> response
{'jsonrpc': '2.0', 'id': 1, 'error': {'code': 3, 'message': 'execution reverted', 'data': '0x8f046edb0000000000000000000000000000000000000000000000000000000063d1a1a400000000000000000000000000000000000000000000000000000000000003ff'}}

But it isn't used in the exception and there is no access to raw response data but there should be a proper way to get it

[kclowes]

Yeah, agreed. Thanks for raising the issue!