streamlit-server-state 0.11.0

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streamlit-server-state

A "server-wide" state shared across the sessions.

import streamlit as st

from streamlit_server_state import server_state, server_state_lock

st.title("Global Counter Example")

with server_state_lock["count"]:  # Lock the "count" state for thread-safety
    if "count" not in server_state:
        server_state.count = 0

increment = st.button("Increment")
if increment:
    with server_state_lock.count:
        server_state.count += 1

decrement = st.button("Decrement")
if decrement:
    with server_state_lock.count:
        server_state.count -= 1

st.write("Count = ", server_state.count)

As above, the API is similar to the built-in SessionState, except one major difference - a "lock" object. The lock object is introduced for thread-safety because the server-state is accessed from multiple sessions, i.e. threads.

Examples

• app_global_count: A sample app like the official counter example for SessionState which uses streamlit-server-state instead and the counter is shared among all the sessions on the server. This is a nice small example to see the usage and behavior of streamlit-server-state. Try to open the app in multiple browser tabs and see the counter is shared among them.
• app_global_slider: A slider widget (st.slider) whose value is shared among all sessions.
• app_chat.py: A simple chat app using streamlit-server-state.
• app_chat_rooms.py: A simple chat app with room separation.

Resources

• New library: streamlit-server-state, a new way to share states among the sessions on the server (Streamlit Community)