Django database query alerting middleware

middleware.py

class DatabaseQueryAlertingMiddleware:
    """
    Middleware that alerts when a threshold for maximum number of database queries or total query time
    is exceeded when loading views in development mode.
    """

    max_queries_threshold = 30
    max_time_threshold = 5  # seconds

    def __init__(self, get_response):
        if not settings.DEBUG:
            raise MiddlewareNotUsed()

        self.get_response = get_response

    def __call__(self, request):
        if not self._should_process_request(request):
            return self.get_response(request)

        response = self.get_response(request)

        total_queries, total_time = self._get_total_queries_and_total_query_time()

        if total_queries > self.max_queries_threshold:
            msg = 'Number of queries for this view ({0} queries) exceeded max threshold of {1} queries'.format(
                total_queries, self.max_queries_threshold,
            )

            messages.warning(request, msg)
            logger.debug(msg)

        if total_time > self.max_time_threshold:
            msg = 'Total query time for this view ({0:.2f} seconds) exceeded max threshold of {1} seconds'.format(
                total_time, self.max_time_threshold
            )

            messages.warning(request, msg)
            logger.debug(msg)

        return response

    def _should_process_request(self, request) -> bool:
        return not (
            request.is_ajax() or
            request.path_info.startswith('/favicon.ico') or
            request.path_info.startswith(settings.STATIC_URL) or
            request.path_info.startswith(settings.MEDIA_URL)
        )

    def _get_total_queries_and_total_query_time(self) -> Tuple[int, float]:
        total_queries = len(connection.queries)
        total_time = sum(float(query['time']) for query in connection.queries)

        return total_queries, total_time