StringParam not working in python Cloud Function Gen2 for global vars

I am using the new Cloud Function gen 2 in python and following this guide and this code sample :

from firebase_functions import https_fn
from firebase_functions.params import IntParam, StringParam

MIN_INSTANCES = IntParam("HELLO_WORLD_MIN_INSTANCES")
WELCOME_MESSAGE = StringParam("WELCOME_MESSAGE")

# To use configured parameters inside the config for a function, provide them
# directly. To use them at runtime, call .value() on them.
@https_fn.on_request(min_instances=MIN_INSTANCES)
def hello_world(req):
    return https_fn.Response(f'{WELCOME_MESSAGE.value()}! I am a function!')

I have runtime errors because :

• First .value() is str so it's not callable, we need to use .value
• Second, WELCOME_MESSAGE.value seems to not be loaded on time for global vars

In my code :

db_url = StringParam("DB_URL")
db_name = StringParam("DB_NAME")


client = MongoClient(db_url.value)
db = client.get_database(db_name.value)

Throws an exception pymongo.errors.ConfigurationError: Empty host (or extra comma in host list).

The var seems to be loaded from this message : i functions: Loaded environment variables from .env.

Note : if i print the value inside a function, it's working, so are parameters not available for global vars ?

Thanks in advance

It looks like you're having the same sort of problem as this question for nodejs, where the solution was to only request the values of parameters when the function is invoked, and not at the global scope.

I can only imagine it works the same way for python. You should consider lazy-initializing the globals after the function is invoked, if they were not already in a prior invocation.