Serve multipe routes on the same function

[lizzzcai]

Hi OpenFunction team,

I would like to request a feature of supporting multi routes in the function framework (mainly in python).

use cases:

1. define custom health endpoint and endpoints for liveness probe and readiness probe (similar issue here Set readiness and liveness URL for function workloads in the functions-framework phase #11).
2. support multi-functions (routes) in a function instance as it is very limited to only support one function in a function instance.
3. dynamically extract params from the route path. for example: @app.route('/product/<name>', methods=["GET"])

example:

# health function
@app.route("/functions/<funcname>/health", methods=["GET"])
def health(request, funcname):
    return "", 200

# dynamic process function
@app.route("/functions/<funcname>:process", methods=["POST"])
def process(request, funcname):

    function = FUNCTIONS.get(funcname)
    data = dict(request.json)
    return {"output": function.process(data["input"])}

Similiar requests in gcp function-framework:

1. Implement Declarative Function Signatures GoogleCloudPlatform/functions-framework-python#159
2. How to serve multiple routes on the same Url : Port GoogleCloudPlatform/functions-framework-python#98

[benjaminhuo]

This is a good requirement, thanks @lizzzcai

[benjaminhuo]

Fixed by OpenFunction/functions-framework-go#51