New 'MessageToDict' implementation breaks with unknown entry types

[tseaver]

>>> from google.cloud.logging import Client
>>> client = Client()
>>> def do_something_with(entry): pass
... 
>>> for entry in client.list_entries():
... do_something_with(entry)
... 
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/cloud/iterator.py", line 211, in _items_iter
 for item in page:
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/cloud/iterator.py", line 155, in next
 result = self._item_to_value(self._parent, item)
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/cloud/logging/_gax.py", line 478, in _item_to_entry
 resource = MessageToDict(entry_pb)
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/protobuf/json_format.py", line 133, in MessageToDict
 return printer._MessageToJsonObject(message)
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/protobuf/json_format.py", line 164, in _MessageToJsonObject
 return self._RegularMessageToJsonObject(message, js)
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/protobuf/json_format.py", line 196, in _RegularMessageToJsonObject
 js[name] = self._FieldToJsonObject(field, value)
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/protobuf/json_format.py", line 230, in _FieldToJsonObject
 return self._MessageToJsonObject(value)
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/protobuf/json_format.py", line 162, in _MessageToJsonObject
 return methodcaller(_WKTJSONMETHODS[full_name][0], message)(self)
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/protobuf/json_format.py", line 266, in _AnyMessageToJsonObject
 sub_message = _CreateMessageFromTypeUrl(type_url)
 File "/home/tseaver/projects/agendaless/Google/src/google-cloud-python/.tox/docs/lib/python2.7/site-packages/google/protobuf/json_format.py", line 341, in _CreateMessageFromTypeUrl
 'Can not find message descriptor by type_url: {0}.'.format(type_url))
TypeError: Can not find message descriptor by type_url: type.googleapis.com/google.cloud.audit.AuditLog.

[dhermes]

@tseaver Yup, @bjwatson had reported this earlier and I confirmed with @waprin yesterday. Sorry for not filing. I'd been meaning to resolve this.

[bjwatson]

@tseaver @dhermes We're tracking this in https://github.com/googleapis/googleapis/issues/187.

What's the relative priority? We're focused on landing our beta surfaces this month, and the related issue #2572 took me down a long tangential path for the past week.

[dhermes]

@bjwatson This is something that's my fault, not your fault. There isn't anything you need to fix, we'll always encounter types we don't know about. The proper behavior is just to leave them as Any instances, and I'll make that fix in google-cloud-python

[tseaver]

@bjwatson I can exercise the new logging snippets with GRPC disabled for now.

[bjwatson]

Ok, thanks @dhermes and @tseaver.

[salrashid123]

ran into this issue as well. Just to document, you can disable gRPC using

os.environ["GOOGLE_CLOUD_DISABLE_GRPC"] = "true" 

[dhermes]

I may just end up reverting #2600.

[dhermes]

It's fairly relevant that the only Any in the logging protobufs is LogEntry.proto_payload (which is part of the payload oneof)

Currently digging in to a nice repro provided by @Fkawala, I made it totally distinct of this library here in a gist.