import contextlib
import logging
import threading

logger = logging.getLogger(__name__)
_local = threading.local()


def get_current_user():
    return getattr(_local, "user", None)


class CurrentUserMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        previous_user = getattr(_local, "user", None)
        _local.user = request.user
        try:
            return self.get_response(request)
        finally:
            if previous_user is None:
                with contextlib.suppress(AttributeError):
                    del _local.user
            else:
                _local.user = previous_user