protobuf-bug
Describes a bug in Google's protobuf library for Python.
To run, make sure you have a working make, python (2, not 3, sorry) and protoc installed, then:
make
You should then see:
protoc --python_out=. example.proto
python show_bug.py
Let's create an empty ExampleMessage instance called message:
Let's set its 'this_should_be_unserializable' extension property:
[OtherMessage.this_should_be_unserializable]: true
"message" is now completely serializable to regular wire format:
'\xc0\xf2\x04\x01'
MessageToDict can even properly serialize it to a dict:
{'[OtherMessage.this_should_be_unserializable.thisShouldBeUnserializable]': True}
But when using ParseDict to deserialize, it fails:
Traceback (most recent call last):
File "show_bug.py", line 30, in <module>
show_bug()
File "show_bug.py", line 26, in show_bug
print ParseDict(as_dict, ExampleMessage())
File "/Users/psobot/Library/Python/2.7/lib/python/site-packages/google/protobuf/json_format.py", line 421, in ParseDict
parser.ConvertMessage(js_dict, message)
File "/Users/psobot/Library/Python/2.7/lib/python/site-packages/google/protobuf/json_format.py", line 452, in ConvertMessage
self._ConvertFieldValuePair(value, message)
File "/Users/psobot/Library/Python/2.7/lib/python/site-packages/google/protobuf/json_format.py", line 552, in _ConvertFieldValuePair
setattr(message, field.name, _ConvertScalarFieldValue(value, field))
AttributeError: Assignment not allowed (no field "this_should_be_unserializable" in protocol message object).
make: *** [all] Error 1