pubsub can't infer a connection when running locally.

[theacodes]

When running locally with gcloud auth providing application default credentials, pubsub is unable to infer a connection, so this will fail:

import pubsub
pubsub.set_default_project('my-project-id')
topic = pubsub.Topic('my-topic')
topic.publish(...)

with EnvironmentError: Connection could not be inferred.

The fix is to set an explicit connection using adc:

credentials = GoogleCredentials.get_application_default()
pubsub.set_default_connection(pubsub.Connection(credentials))

However, storage and datastore do not have this issue. It seems unnecessarily to do this just for pubsub.

[dhermes]

@jonparrott This is a known issue, but becomes moot via #910

[theacodes]

Gotcha. Subscribed to #910 and will keep an eye on it.

[dhermes]

Yeah. After #861 it's very possible that _implicit_environ will all be removed and you'll need to create an explicit client. However, the constructors will have nice defaults just like set_default_* do.

[dhermes]

#910 made this moot.

[theacodes]

confirmed, the new client method only needs the project id. Thanks!