Is there a way to use decorators to bind a route to azure WebPubSub events using azure functions using the V2 Python programming model?

Question

Azure functions recently changed their programming model for python as described here, https://techcommunity.microsoft.com/t5/azure-compute-blog/azure-functions-v2-python-programming-model/ba-p/3665168 and I am trying to port some code.

In v1 you use function.json to bind get the connection as an input, as well as to listen to messages from the hub.

{
"scriptFile": "__init__.py",
"bindings": [
    {
        "type": "webPubSubTrigger",
        "direction": "in",
        "name": "request",
        "hub": "simplechat",
        "eventName": "message",
        "eventType": "user"
    }
]
}

In C# and V2 for python, you should use decorators https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/azure-web-pubsub/reference-functions-bindings.md but as far as I can tell, there is no decorator for this in Python.

Answer 1

• I used Azure functions version(v3) and python version 3.10.9.

• In v2 I tried using my python code but unable to reach so switched to v3 then Iam able to bind and connected. Please refer this doc for versions info

• I used the below decorators to bind a route to Azure Web PubSub events using Azure Functions v2.

import azure.functions as func

def webpubsub_route(route: str):
    def decorator(func):
        def wrapper(req: func.WebPubSubEvent):
            return func(req)

        wrapper.route = route
        return wrapper

    return decorator

@webpubsub_route(route="myhub/mymessage")
def main(event: func.WebPubSubEvent):
    message = event.get_json()
    return func.HttpResponse(f"Received message: {message}", status_code=200)

• webpubsub_eventdecorator logs the incoming event details and passes the event request to the main function for further processing.

• Able to access the response from the hub by inputs given from userID.