S
Solara

general

2 No if you put in a top level dict not

MMaartenBreddels10/16/2023
2) No, if you put in a top level dict (not reactive) in a module, every user sees the same dictionary. The only problem with that is that you cannot get an event when the data changes, but you could do a proxy. I can give some example code in a thread that doesn't work yet, but might get the idea across better. 4) Not yet, but coming! (see also the new thread)
"""# Custom state storage

Solara makes it easy to store state/data on the server side, scoped to a kernel, using [reactive variables](/api/reactive).

However, sometimes you want to store state yourself in an external system (i.e. not Solara), and for this you can use the [get_kernel_id()](/api/get_kernel_id) function to get a unique id for each kernel.

If you want to store state/data scoped to a browser session, you can use the [get_session_id()](/api/get_session_id) function to get a unique id tied to the users browser. This can
be used to store state that outlives a page refresh.

In case you want to store state/data scoped to a user, you can use a similar strategy, but use a unique identifier based on the user, instead of the session id. You can take a look at
[Our oauth example](examples/general/login_oauth) or [the authorization example](/examples/apps/authorization) for inspiration.

"""
import solara
from typing import Dict


# used only to force updating of the page
force_update_counter = solara.reactive(0)

session_storage: Dict[str, str] = {}


def store_in_session_storage(value):
session_storage[solara.get_session_id()] = value
force_update_counter.value += 1


kernel_storage: Dict[str, str] = {}


def store_in_kernel_storage(value):
kernel_storage[solara.get_kernel_id()] = value
force_update_counter.value += 1


@solara.component
def Page():
solara.InputText(
"Stored under the kernel id key",
value=kernel_storage.get(solara.get_kernel_id(), "This does not"),
on_value=store_in_kernel_storage,
continuous_update=True,
)

solara.InputText(
"Stored under the sesssion id key",
value=session_storage.get(solara.get_session_id(), "This outlives a page refresh"),
on_value=store_in_session_storage,
continuous_update=True,
)
"""# Custom state storage

Solara makes it easy to store state/data on the server side, scoped to a kernel, using [reactive variables](/api/reactive).

However, sometimes you want to store state yourself in an external system (i.e. not Solara), and for this you can use the [get_kernel_id()](/api/get_kernel_id) function to get a unique id for each kernel.

If you want to store state/data scoped to a browser session, you can use the [get_session_id()](/api/get_session_id) function to get a unique id tied to the users browser. This can
be used to store state that outlives a page refresh.

In case you want to store state/data scoped to a user, you can use a similar strategy, but use a unique identifier based on the user, instead of the session id. You can take a look at
[Our oauth example](examples/general/login_oauth) or [the authorization example](/examples/apps/authorization) for inspiration.

"""
import solara
from typing import Dict


# used only to force updating of the page
force_update_counter = solara.reactive(0)

session_storage: Dict[str, str] = {}


def store_in_session_storage(value):
session_storage[solara.get_session_id()] = value
force_update_counter.value += 1


kernel_storage: Dict[str, str] = {}


def store_in_kernel_storage(value):
kernel_storage[solara.get_kernel_id()] = value
force_update_counter.value += 1


@solara.component
def Page():
solara.InputText(
"Stored under the kernel id key",
value=kernel_storage.get(solara.get_kernel_id(), "This does not"),
on_value=store_in_kernel_storage,
continuous_update=True,
)

solara.InputText(
"Stored under the sesssion id key",
value=session_storage.get(solara.get_session_id(), "This outlives a page refresh"),
on_value=store_in_session_storage,
continuous_update=True,
)
This is a preview, so not yet in the docs
Ffrisco10/16/2023
Oh, I got it! this is really helpful, thank you Maarten

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