docs/langchain/libs/community/langchain_community/utilities/cassandra.py

from __future__ import annotations

import asyncio
from enum import Enum
from typing import TYPE_CHECKING, Any, Callable

if TYPE_CHECKING:
    from cassandra.cluster import ResponseFuture, Session


async def wrapped_response_future(
    func: Callable[..., ResponseFuture], *args: Any, **kwargs: Any
) -> Any:
    """Wrap a Cassandra response future in an asyncio future.

    Args:
        func: The Cassandra function to call.
        *args: The arguments to pass to the Cassandra function.
        **kwargs: The keyword arguments to pass to the Cassandra function.

    Returns:
        The result of the Cassandra function.
    """
    loop = asyncio.get_event_loop()
    asyncio_future = loop.create_future()
    response_future = func(*args, **kwargs)

    def success_handler(_: Any) -> None:
        loop.call_soon_threadsafe(asyncio_future.set_result, response_future.result())

    def error_handler(exc: BaseException) -> None:
        loop.call_soon_threadsafe(asyncio_future.set_exception, exc)

    response_future.add_callbacks(success_handler, error_handler)
    return await asyncio_future


async def aexecute_cql(session: Session, query: str, **kwargs: Any) -> Any:
    return await wrapped_response_future(session.execute_async, query, **kwargs)


class SetupMode(Enum):
    SYNC = 1
    ASYNC = 2
    OFF = 3