Python Google Cloud Function Connection reset by peer

Question

As detailed here: https://issuetracker.google.com/issues/113672049

Cross-posted here: https://github.com/GoogleCloudPlatform/google-cloud-python/issues/5879)

I'm getting a connection reset error when using the Firebase Storage API from a Google Cloud Function in Python.

The deployed function is calling one blob-get i.e.

from firebase_admin import storage

def fn(request):
  bucket = 'my-firebase-bucket'
  path = '/thing'
  blob = storage.bucket(bucket).get_blob(path)

The failure is intermittent; the function has around a 90% success rate.

It seems more likely to fail the first time the function is called after it is deployed.

Answer 1

Cloud functions are stateless, but can re-use global state from previous invocations. This is explained in tips and these docs.

Using global state with retries should give you a more robust function:

from tenacity import retry, stop_after_attempt, wait_random
from firebase_admin import storage

@retry(stop=stop_after_attempt(3), wait=wait_random(min=1, max=2))
def get_bucket(storage):
    return storage.bucket('my-firebase-bucket')

@retry(stop=stop_after_attempt(3), wait=wait_random(min=1, max=2))
def get_blob(bucket, path):
    return bucket.get_blob(path)

bucket = get_bucket(storage)

def fn(request):
  path = '/thing'
  blob = get_blob(bucket, path)
  # etc..