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| """Hack to add per-session state to Streamlit. | |
| Usage | |
| ----- | |
| import SessionState | |
| >>> | |
| session_state = SessionState.get(user_name='', favorite_color='black') | |
| session_state.user_name | |
| '' | |
| session_state.user_name = 'Mary' | |
| session_state.favorite_color | |
| 'black' | |
| Since you set user_name above, next time your script runs this will be the | |
| result: | |
| session_state = get(user_name='', favorite_color='black') | |
| session_state.user_name | |
| 'Mary' | |
| """ | |
| try: | |
| import streamlit.ReportThread as ReportThread | |
| from streamlit.server.Server import Server | |
| except Exception: | |
| # Streamlit >= 0.65.0 | |
| import streamlit.report_thread as ReportThread | |
| from streamlit.server.server import Server | |
| class SessionState(object): | |
| def __init__(self, **kwargs): | |
| """A new SessionState object. | |
| Parameters | |
| ---------- | |
| **kwargs : any | |
| Default values for the session state. | |
| Example | |
| ------- | |
| >>> session_state = SessionState(user_name='', favorite_color='black') | |
| >>> session_state.user_name = 'Mary' | |
| '' | |
| >>> session_state.favorite_color | |
| 'black' | |
| """ | |
| for key, val in kwargs.items(): | |
| setattr(self, key, val) | |
| def get(**kwargs): | |
| """Gets a SessionState object for the current session. | |
| Creates a new object if necessary. | |
| Parameters | |
| ---------- | |
| **kwargs : any | |
| Default values you want to add to the session state, if we're creating a | |
| new one. | |
| Example | |
| ------- | |
| >>> session_state = get(user_name='', favorite_color='black') | |
| >>> session_state.user_name | |
| '' | |
| >>> session_state.user_name = 'Mary' | |
| >>> session_state.favorite_color | |
| 'black' | |
| Since you set user_name above, next time your script runs this will be the | |
| result: | |
| >>> session_state = get(user_name='', favorite_color='black') | |
| >>> session_state.user_name | |
| 'Mary' | |
| """ | |
| # Hack to get the session object from Streamlit. | |
| ctx = ReportThread.get_report_ctx() | |
| this_session = None | |
| current_server = Server.get_current() | |
| if hasattr(current_server, "_session_infos"): | |
| # Streamlit < 0.56 | |
| session_infos = Server.get_current()._session_infos.values() | |
| else: | |
| session_infos = Server.get_current()._session_info_by_id.values() | |
| for session_info in session_infos: | |
| s = session_info.session | |
| if ( | |
| # Streamlit < 0.54.0 | |
| (hasattr(s, "_main_dg") and s._main_dg == ctx.main_dg) | |
| or | |
| # Streamlit >= 0.54.0 | |
| (not hasattr(s, "_main_dg") and s.enqueue == ctx.enqueue) | |
| or | |
| # Streamlit >= 0.65.2 | |
| ( | |
| not hasattr(s, "_main_dg") | |
| and s._uploaded_file_mgr == ctx.uploaded_file_mgr | |
| ) | |
| ): | |
| this_session = s | |
| if this_session is None: | |
| raise RuntimeError( | |
| "Oh noes. Couldn't get your Streamlit Session object. " | |
| "Are you doing something fancy with threads?" | |
| ) | |
| # Got the session object! Now let's attach some state into it. | |
| if not hasattr(this_session, "_custom_session_state"): | |
| this_session._custom_session_state = SessionState(**kwargs) | |
| return this_session._custom_session_state | |