Unable to get firebase app to deploy a simple web request using python's Flask

[mnjuhn]

I have the following main.py firebase function which I am trying to deploy using firebase deploy But when I curl the firebase endpoint I get a 404 error:

curl -v https://us-central1-<project-id>.cloudfunctions.net/test

Here is the function I deployed:

from firebase_admin import initialize_app, db
from firebase_functions import https_fn
import flask

initialize_app()
app = flask.Flask(__name__)

print("TEST APP")

@app.get('/test')
def hello_world():
    print('Hello World')
    return 'Hello, Firebase Cloud Functions with Python'

When I run the function locally by entering this command flask --app main run I am able to hit this endpoint, but not when I curl the firebase endpoint.

However, when I go to the Google Cloud Console, no functions appear. I am thinking that there must be a problem with the deployment. When I type: firebase -P staging deploy --only functions
I get the following output:

(node:25815) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)

=== Deploying to '<progject-id>'...

i  deploying functions
i  functions: preparing codebase cancer-hacked for deployment
i  functions: ensuring required API cloudfunctions.googleapis.com is enabled...
i  functions: ensuring required API cloudbuild.googleapis.com is enabled...
i  artifactregistry: ensuring required API artifactregistry.googleapis.com is enabled...
✔  functions: required API cloudfunctions.googleapis.com is enabled
✔  artifactregistry: required API artifactregistry.googleapis.com is enabled
✔  functions: required API cloudbuild.googleapis.com is enabled
i  functions: Loading and analyzing source code for codebase cancer-hacked to determine what to deploy
 * Serving Flask app 'serving'
 * Debug mode: off

WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on http://127.0.0.1:8081
Press CTRL+C to quit

127.0.0.1 - - [15/Nov/2024 14:55:25] "GET /__/functions.yaml HTTP/1.1" 200 -

127.0.0.1 - - [15/Nov/2024 14:55:25] "GET /__/quitquitquit HTTP/1.1" 200 -

/bin/sh: line 1: 25820 Terminated: 15          python3.11 "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/firebase_functions/private/serving.py"

i  functions: cleaning up build files...

✔  Deploy complete!

Project Console: https://console.firebase.google.com/project/<progject-id>/overview

I have done the following commands:
pip install -r requirements.txt

firebase init functions
My requirements.txt file has the following:

Flask
firebase-admin
firebase-functions

And I have the following installed libraires by running pip3 list are:

Package                  Version
------------------------ ---------
blinker                  1.9.0
CacheControl             0.14.1
cachetools               5.5.0
certifi                  2024.8.30
cffi                     1.17.1
charset-normalizer       3.4.0
click                    8.1.7
cloudevents              1.9.0
cryptography             43.0.3
deprecation              2.1.0
firebase-admin           6.6.0
firebase-functions       0.1.2
Flask                    3.1.0
Flask-Cors               5.0.0
functions-framework      3.8.2
google-api-core          2.23.0
google-api-python-client 2.153.0
google-auth              2.36.0
google-auth-httplib2     0.2.0
google-cloud-core        2.4.1
google-cloud-firestore   2.19.0
google-cloud-storage     2.18.2
google-crc32c            1.6.0
google-events            0.13.0
google-resumable-media   2.7.2
googleapis-common-protos 1.66.0
grpcio                   1.67.1
grpcio-status            1.67.1
gunicorn                 23.0.0
httplib2                 0.22.0
idna                     3.10
itsdangerous             2.2.0
Jinja2                   3.1.4
MarkupSafe               3.0.2
msgpack                  1.1.0
packaging                24.2
pip                      24.0
proto-plus               1.25.0
protobuf                 5.28.3
pyasn1                   0.6.1
pyasn1_modules           0.4.1
pycparser                2.22
PyJWT                    2.9.0
pyparsing                3.2.0
PyYAML                   6.0.2
requests                 2.32.3
rsa                      4.9
setuptools               65.5.0
typing_extensions        4.12.2
uritemplate              4.1.1
urllib3                  2.2.3
watchdog                 6.0.0
Werkzeug                 3.1.3

I am running python version 3.11.9. Any help would be appreciated.

[mnjuhn]

I found what I was missing to get the firebase cloud function working using python's Flask library. I had to register the flask app to use https_fn wrapper. Here is the code which now works when doing a firebase deploy

import firebase_admin
from firebase_admin import credentials, firestore
from flask import Flask, request
from firebase_functions import https_fn
from cancer import get_cancer

# Initialize Firebase Admin SDK
cred = credentials.Certificate("serviceAccountKey.json")
firebase_admin.initialize_app(cred)
db = firestore.client()

app = Flask(__name__)

@app.route('/test', methods=['GET'])
def test():
    print("Hello World")
    return "Hello World"

# Main entry point for Firebase Functions
#firebase_function = functions.https.on_request(app)

@https_fn.on_request()
def functions(req: https_fn.Request) -> https_fn.Response:
    with app.request_context(req.environ):
        return app.full_dispatch_request()

You can find more documentaiton in the following firebase docs:

https://firebase.google.com/docs/functions/http-events?gen=2nd

You can then access the test endpoint by going to curl -v https://us-central1-<project-id>.cloudfunctions.net/functions/test