def decode_contract_call(contract_abi: list, call_data: str):
call_data_bin = decode_hex(call_data)
method_signature = call_data_bin[:4]
for description in contract_abi:
if description.get('type') != 'function':
continue
method_name = normalize_abi_method_name(description['name'])
arg_types = [item['type'] for item in description['inputs']]
method_id = get_abi_method_id(method_name, arg_types)
if zpad(encode_int(method_id), 4) == method_signature:
args = decode_abi(arg_types, call_data_bin[4:])
return method_name, args
def encode_calldata(func_name, arg_types, args):
"""
:param func_name:
:param arg_types:
:param args:
:return:
"""
mid = method_id(func_name, arg_types)
function_selector = zpad(encode_int(mid), 4)
args = encode_abi(arg_types, args)
return "0x" + function_selector.hex() + args.hex()
def encode_calldata(func_name, arg_types, args):
mid = method_id(func_name, arg_types)
function_selector = zpad(encode_int(mid), 4)
args = encode_abi(arg_types, args)
return "0x" + function_selector + args
