def find_matching_fn_abi(abi, fn_identifier=None, args=None, kwargs=None):
args = args or tuple()
kwargs = kwargs or dict()
num_arguments = len(args) + len(kwargs)
if fn_identifier is FallbackFn:
return get_fallback_func_abi(abi)
if not is_text(fn_identifier):
raise TypeError("Unsupported function identifier")
name_filter = functools.partial(filter_by_name, fn_identifier)
arg_count_filter = functools.partial(filter_by_argument_count,
num_arguments)
encoding_filter = functools.partial(filter_by_encodability, args, kwargs)
function_candidates = pipe(abi, name_filter, arg_count_filter,
encoding_filter)
if len(function_candidates) == 1:
return function_candidates[0]
else:
matching_identifiers = name_filter(abi)
matching_function_signatures = [
abi_to_signature(func) for func in matching_identifiers
]
arg_count_matches = len(arg_count_filter(matching_identifiers))
encoding_matches = len(encoding_filter(matching_identifiers))
if arg_count_matches == 0:
diagnosis = "\nFunction invocation failed due to improper number of arguments."
elif encoding_matches == 0:
diagnosis = "\nFunction invocation failed due to no matching argument types."
elif encoding_matches > 1:
diagnosis = (
"\nAmbiguous argument encoding. "
"Provided arguments can be encoded to multiple functions matching this call."
)
message = (
"\nCould not identify the intended function with name `{name}`, "
"positional argument(s) of type `{arg_types}` and "
"keyword argument(s) of type `{kwarg_types}`."
"\nFound {num_candidates} function(s) with the name `{name}`: {candidates}"
"{diagnosis}").format(
name=fn_identifier,
arg_types=tuple(map(type, args)),
kwarg_types=valmap(type, kwargs),
num_candidates=len(matching_identifiers),
candidates=matching_function_signatures,
diagnosis=diagnosis,
)
raise ValidationError(message)
def parse_transaction_input(self, inputdata):
selector = inputdata[0:10]
argsdata = inputdata[10:]
# print(selector)
# print(self.func_abi_map_by_selector.keys())
if selector not in self.func_abi_map_by_selector:
return None
func_abi = self.func_abi_map_by_selector[selector]
# print(func_abi)
args_abi = get_fn_abi_types_single(func_abi, "inputs")
args = decode_single(args_abi, decode_hex(argsdata))
result = dict()
result['name'] = func_abi["name"]
result['args'] = args
result['signature'] = abi_to_signature(func_abi)
return result
def parse_abi(self):
'''for item in self.contract_abi:
if (item["type"] != "constructor"):
print(item["name"], " is a ", item["type"])
hash4 = function_signature_to_4byte_selector(item["name"] + '()')
print("function hash4:", encode_hex(hash4))'''
funclist = filter_by_type("function", self.contract_abi)
for func in funclist:
signature = abi_to_signature(func)
selector = function_signature_to_4byte_selector(signature)
# print(func)
# print(signature)
# print(encode_hex(selector) )
self.func_abi_map_by_selector[encode_hex(selector)] = func
self.func_abi_map_by_name[func['name']] = func
eventlist = filter_by_type("event", self.contract_abi)
for event in eventlist:
topic = event_abi_to_log_topic(event)
# print(event)
# print(encode_hex(topic) )
self.event_abi_map[encode_hex(topic)] = event
def get_func_signature(self, name):
if (name not in self.func_abi_map_by_name):
return None
# abi = self.func_abi_map_by_name[name]
return abi_to_signature(name)