Web3.py: Function invocation failed due to no matching argument types

Question

I'm currently facing an issue when interacting with an Ethereum smart contract using Python's Web3 module. More specifically, I'm trying to call a specific function named "requestL2Transaction" from the contract with a set of arguments, but I keep getting an error stating that the argument types do not match.

The function signature in the contract's ABI is as follows:

requestL2Transaction(address,uint256,bytes,uint256,uint256,bytes[],address)

And I'm trying to call it as follows (actual values have been replaced with generic representations for security reasons):

contract_address = "<contract_address>"
abi = <abi> # The actual ABI of the contract
function_name = "requestL2Transaction"
blockchain = "ethereum"
wallet = <wallet> # My wallet instance

# The arguments for the function
_contractL2 = "0x..."
_l2Value = 10000000000000000
_calldata = b''
_l2GasLimit = 1100000
_gasPricePerPubdata = 800
_factoryDeps = []
_refundRecipient = "0x..."

interact_with_contract(wallet, contract_address, abi, function_name, blockchain, None, 
                        _contractL2=_contractL2, _l2Value=_l2Value, _calldata=_calldata, 
                        _l2GasLimit=_l2GasLimit, _gasPricePerPubdata=_gasPricePerPubdata, _factoryDeps=_factoryDeps, _refundRecipient=_refundRecipient)

Here is the code of my "interact_with_contract" function:

async def interact_with_contract(self, wallet, contract_address, abi, function_name, blockchain, msg_value=None, *args, **kwargs):
    contract = self.web3.eth.contract(address=contract_address, abi=abi)
    function = contract.functions[function_name]
    try:
        function_call = function(*args, **kwargs)
    except Exception as e:
        # Handle exception
        # ...
        return

    # Other operations
    # ...

The returned error is the following:

ERROR - Error while building function call : Could not identify the intended function with name requestL2Transaction, positional arguments with type(s) `` and keyword arguments with type(s) {'_l2GasLimit': 'int', '_refundRecipient': 'address', '_gasPricePerPubdata': 'int', '_contractL2': 'address', '_calldata': 'bytes', '_factoryDeps': '(bytes)', '_l2Value': 'int'}. Found 1 function(s) with the name requestL2Transaction: ['requestL2Transaction(address,uint256,bytes,uint256,uint256,bytes[],address)'] Function invocation failed due to no matching argument types.

As you can see, it seems like the argument types passed do not match those expected by the contract function, even though I have checked multiple times and they seem correct.

If anyone has faced a similar issue before or has an idea of what might be causing this error, I would be very grateful for any help or advice.

you might wish to format the question so that it is readable to users. — darren
– darren, Commented Jul 10, 2023 at 17:17

Mikko Ohtamaa · Accepted Answer · 2023-07-11 06:28:39Z

0

As this question is debugging problem for your own code, it is difficult to provide an answer. However to the following

Any address type is Python string
Any bytes type is Python bytes
Any uint and similar type is Python integer

Then

Use interactive debugger to inspect what are the types you are passing to the function
Figure out where is the mismatch
Correctly cast these types to what your function requires

answered Jul 11, 2023 at 6:28

Mikko Ohtamaa

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Comments

Sebastian Wozny · Accepted Answer · 2023-07-12 17:50:00Z

0

If you have these values as strings and need to convert them to integers, you can use the built-in int() function:

_l2GasLimit = int("1100000")
_gasPricePerPubdata = int("800")

The int() function converts a valid string representation of an integer into an integer. If the string cannot be converted into an integer, a ValueError will be raised. Therefore, it's a good practice to use a try-except block when using int() to handle any potential ValueError exceptions:

try:
    _l2GasLimit = int("1100000")
    _gasPricePerPubdata = int("800")
except ValueError:
    print("Error: Invalid integer value.")

edited Jul 12, 2023 at 17:50

Sebastian Wozny

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answered Jul 11, 2023 at 9:01

SiXty

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