Migrating google-cloud-pubsub based code from 0.25 to 0.32

I have some code that uses google-cloud-pubsub in version 0.25 and is run on Kubernetes and minikube locally. I’m trying to update the code to be compatible with latest package version but I have some problems with configuration when running in minikube.

Old version created the pubsub client in development like this:

with utils.EnvironmentContext('PUBSUB_EMULATOR_HOST', 'dev-pubsub:8042'):
    return pubsub.Client(_http=httplib2.Http(), _use_grpc=False)

But in 0.32 PublisherClient nor SubscriberClient don’t have those kwargs. There is GOOGLE_CLOUD_DISABLE_GRPC env variable that can be set (to a string and not a bool?) but still when I try to use my service it looks like it’s trying to authenticate via gRPC:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/grpc/_plugin_wrapping.py", line 77, in __call__
    callback_state, callback))
  File "/usr/local/lib/python3.6/site-packages/google/auth/transport/grpc.py", line 77, in __call__
    callback(self._get_authorization_headers(context), None)
  File "/usr/local/lib/python3.6/site-packages/google/auth/transport/grpc.py", line 65, in _get_authorization_headers
    headers)
  File "/usr/local/lib/python3.6/site-packages/google/auth/credentials.py", line 121, in before_request
    self.refresh(request)
  File "/usr/local/lib/python3.6/site-packages/google/oauth2/service_account.py", line 322, in refresh
    request, self._token_uri, assertion)
  File "/usr/local/lib/python3.6/site-packages/google/oauth2/_client.py", line 145, in jwt_grant
    response_data = _token_endpoint_request(request, token_uri, body)
  File "/usr/local/lib/python3.6/site-packages/google/oauth2/_client.py", line 111, in _token_endpoint_request
    _handle_error_response(response_body)
  File "/usr/local/lib/python3.6/site-packages/google/oauth2/_client.py", line 61, in _handle_error_response
    error_details, response_body)
google.auth.exceptions.RefreshError: ('invalid_client: The OAuth client was not found.', '{\n  "error" : "invalid_client",\n  "error_description" : "The OAuth client was not found."\n}')

What’s the correct way to handle dev configuration for 0.32? (was working ok for 0.25)

[gcbirzan]

As a note, everything after 0.28.0 requires GRPC so those arguments don’t make any sense. But, the emulator (if recent enough, I guess?) should work with the new version.

[theacodes]

Cool, it seems we can close this. Let me know if there’s anything else to be done.