Function __get_on_session_created

sdk/python/packages/flet/src/flet/app.py:316–362

Build session-start callback that executes the user `main` handler. Args: main: User-provided app entry handler. Returns: Async callback that initializes page context and runs `main`.

(
    main: Optional[AppCallable],
)

def __get_on_session_created(
    main: Optional[AppCallable],
) -> Callable[[Session], Awaitable[None]]:
    """
    Build session-start callback that executes the user `main` handler.

    Args:
        main: User-provided app entry handler.

    Returns:
        Async callback that initializes page context and runs `main`.
    """

    async def on_session_created(session: Session):
        """
        Initialize per-session context and execute app entry handler.

        Args:
            session: Active page session.
        """

        logger.info("App session started")
        try:
            assert main is not None
            _context_page.set(session.page)
            context.reset_auto_update()
            if inspect.iscoroutinefunction(main):
                await main(session.page)

            elif inspect.isasyncgenfunction(main):
                async for _ in main(session.page):
                    await session.after_event(session.page)

            elif inspect.isgeneratorfunction(main):
                for _ in main(session.page):
                    await session.after_event(session.page)
            else:
                # run synchronously
                main(session.page)

            await session.after_event(session.page)

        except Exception as e:
            logger.error("Unhandled error in main() handler", exc_info=True)
            session.error(f"{e}\n{traceback.format_exc()}")

    return on_session_created


async def __run_socket_server(