populate routes with gunicorn (connexion 3.0.0a7)

[jdkent]

Description

When starting the flask app with gunicorn, the connexion app does not initialize routes. Is there another way to initialize the connexion app while running the flask app with gunicorn?

example:

import logging
from pathlib import Path

import connexion
from connexion.resolver import MethodViewResolver

logging.basicConfig(level=logging.INFO)

zoo = {
    1: {
        "id": 1,
        "name": "giraffe",
        "tags": ["africa", "yellow", "hoofs", "herbivore", "long neck"],
    },
    2: {
        "id": 2,
        "name": "lion",
        "tags": ["africa", "yellow", "paws", "carnivore", "mane"],
    },
}


app = connexion.FlaskApp(__name__, specification_dir="spec/")

options = {"swagger_ui": True}
app.add_api(
    "openapi.yaml",
    options=options,
    arguments={"title": "MethodViewResolver Example"},
    resolver=MethodViewResolver(
        "api",
        # class params are entirely optional
        # they allow to inject dependencies top down
        # so that the app can be wired, in the entrypoint
        class_arguments={"PetsView": {"kwargs": {"pets": zoo}}},
    ),
    strict_validation=True,
    validate_responses=True,
)

# get access to the flask app
flask_app = app.app

if __name__ == "__main__":
    app.run(f"{Path(__file__).stem}:app", port=8080)

Then I ran gunicorn

gunicorn -w 1 -b :8080 app:flask_app --log-level debug --timeout 120

Expected behaviour

http://localhost:8080/openapi/pets

would show pets

Actual behaviour

{
"type": "about:blank",
"title": "Not Found",
"detail": "The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.",
"status": 404
}

Steps to reproduce

run script above

Additional info:

Output of the commands:

• python --version
• pip show connexion | grep "^Version\:"

[jdkent]

needed to use uvicorn worker-class 😆

gunicorn -w 1 -b :8080 app:flask_app --log-level debug --timeout 120 --worker-class uvicorn.workers.UvicornWorker

[RobbeSneyders]

Thanks @jdkent, will add this to the documentation.