bigtable.client asking for credentials while using emulator

[Job-Heersink]

I'm experiencing issues with connecting locally to a cloud big table emulator.
It is very similar to this issue:
#184 (comment)

Environment details
OS type: Ubuntu
Python version: 3.8
pip version: 21.2.4
google-cloud-bigtable version: 2.4.0

my code:

os.environ["BIGTABLE_EMULATOR_HOST"] = "localhost:8086"
print(os.getenv("BIGTABLE_EMULATOR_HOST")) #checks out
self.client = bigtable.Client(project=project_id, admin=True)

self.instance = self.client.instance("anonymous")
self.instance.create()

I'm running the emulator via docker locally (bigtruedata/gcloud-bigtable-emulator) on port 8086.

I get the following error when trying to run the code:

Traceback (most recent call last):
  File "/home/job/projects/sg_lab/server/bigtable_handler.py", line 34, in <module>
    dh = BigtableHandler()
  File "/home/job/projects/sg_lab/server/bigtable_handler.py", line 12, in __init__
    self.client = bigtable.Client(admin=True)
  File "/home/job/.local/lib/python3.8/site-packages/google/cloud/bigtable/client.py", line 184, in __init__
    super(Client, self).__init__(
  File "/home/job/.local/lib/python3.8/site-packages/google/cloud/client.py", line 316, in __init__
    _ClientProjectMixin.__init__(self, project=project, credentials=credentials)
  File "/home/job/.local/lib/python3.8/site-packages/google/cloud/client.py", line 264, in __init__
    project = self._determine_default(project)
  File "/home/job/.local/lib/python3.8/site-packages/google/cloud/client.py", line 283, in _determine_default
    return _determine_default_project(project)
  File "/home/job/.local/lib/python3.8/site-packages/google/cloud/_helpers.py", line 152, in _determine_default_project
    _, project = google.auth.default()
  File "/home/job/.local/lib/python3.8/site-packages/google/auth/_default.py", line 483, in default
    raise exceptions.DefaultCredentialsError(_HELP_MESSAGE)
google.auth.exceptions.DefaultCredentialsError: Could not automatically determine credentials. Please set GOOGLE_APPLICATION_CREDENTIALS or explicitly create credentials and re-run the application. For more information, please see https://cloud.google.com/docs/authentication/getting-started

Process finished with exit code 1

[tseaver]

@supergreditur Thanks for the report! As of PR #430, the emulator should be fine running in an environment lacking any credentials (we now run it that way in a Github Workflow action). That fix should be available once we make a new release (likely next week, after all the Googlers return from the NEXT conference).