Managing pull_session and server_session from FastAPI

[sbi_vm]

@Hoxbro , great example, and it’s helped me set up some login stuff (which was also an issue I had on my to-do list). My original question however, was more related to the bokeh document sessions? (not sure if I am using the right term)

The issue I am running into is that if I have 2 users on the site at same time, they seem to be accessing the same underlying bokeh/panel document… if user 1 changes a pn.widgets.CheckButtonGroup value, for example, user 2’s browser reflects that selection too… they aren’t independent sessions!

I figured that panel/bokeh would instantiate a new class instance for each connection, but that doesn’t seem to be the case.

I updated parts of my code to reflect how used the server_session function in your repo example:

 script = server_session(
        session_id=generate_session_id(SECRET_KEY, signed=True), url=url
    )

…and updated my pn.serve section as well:

pn.serve(
    serving,
    port=5006,
    allow_websocket_origin=ALLOWED_HOSTS,
    address=f"{local_ip}",
    show=False,
    sign_sessions=True,
    secret_key=SECRET_KEY,
    generate_session_ids=False,
    num_process= 2,
)

…but I am still seeing the same behaviour (linked plots between 2 users).

How do I get two separate instances of the same app class? Do I need to launch a separate pn.serve() on a different port for each?

It sounds kind of similar to what @khannaum was describing in October:

Embed Panel in fastApi

i followed @t-houssain following link and shifted my three panel app in fastApi server and Now my dashboards is blazing fast and upload in browsers in less then a minute. Thanks @t-houssian one problem i am facing if two people access the same dashbaord on their browsers they work asynchronously. i.e. if one access any page on its browser other person’s dashboard which is loaded in browser updated to same page

Looks like maybe @t-houssian had a solution using param.ObjectSelector instead of pn.widgets that I haven’t quite wrapped my head around… I think I need to go back and read through the panel docs again; feel like I am missing something fundamental in the way it works… I thought each connection would create a new server document based on …
https://panel.holoviz.org/user_guide/Server_Deployment.html

Whenever a user accesses the app or dashboard in a browser a new session is created which executes the app code and creates a new Document containing the models served to the browser where they are rendered by BokehJS.