Storage/Firestore: (in Cloud Functions): Dependencies need a specific sequence

[StefMa]

1. Specify the API at the beginning of the title (for example, "BigQuery: ...") General, Core, and Other are also allowed as types ✅
2. OS type and version I use both in Cloud Functions (Beta Runtime)
3. Python version and virtual environment information python --version 3.7
4. google-cloud-python version pip show google-cloud, pip show google-<service> or pip freeze ❌
5. Stacktrace if available
   Stacktrace

Detailed stack trace: Traceback (most recent call last):
  File "/env/local/lib/python3.7/site-packages/google/cloud/functions_v1beta2/worker.py", line 211, in check_or_load_user_function
    _function_handler.load_user_function()
  File "/env/local/lib/python3.7/site-packages/google/cloud/functions_v1beta2/worker.py", line 140, in load_user_function
    spec.loader.exec_module(main)
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/user_code/main.py", line 2, in <module>

    from google.cloud import firestore
  File "/env/local/lib/python3.7/site-packages/google/cloud/firestore.py", line 18, in <module>
    from google.cloud.firestore_v1beta1 import __version__
  File "/env/local/lib/python3.7/site-packages/google/cloud/firestore_v1beta1/__init__.py", line 21, in <module>
    from google.cloud.firestore_v1beta1._helpers import GeoPoint
  File "/env/local/lib/python3.7/site-packages/google/cloud/firestore_v1beta1/_helpers.py", line 24, in <module>
    import grpc
ModuleNotFoundError: No module named 'grpc'

6. Steps to reproduce Add this to your requirements.txt:

   google-cloud-storage==1.12.0
   google-cloud-firestore==0.29.0

   And import both in the main.py:

   from google.cloud import storage
   from google.cloud import firestore

   Then deploy the function...

7. Code example ☝️ See above

When I change the requirements.txt to:

from google.cloud import firestore
from google.cloud import storage

So basically switching the dependencies - it works without any issue.

I don't know if that have something to do that firestore is not "offical" supported for 3.7 as the README says currently or something different 🤷‍♂️ (Maybe its also a issue on the Cloud Function side. Then it would be great to ping me where I can report this issue 👍 ) But because I'm not that Python expert I wanted to report this 😇

[tseaver]

@StefMa Thanks for the report! This issue is actually a bug in pip, such that it does not enforce "extras" for a package it has already installed. The workaround you found (installing google-cloud-firestore, which depends on the grpc extra of google-api_core) before google-cloud-storage, which does not, is all we can do for now.