Limit Concurrent Views

# settings.py

MAX_USERS = 10
MAX_VIEWS_PER_USER = 10

MAX_WORKER_THREADS = MAX_USERS * MAX_VIEWS_PER_USER * 2
MAX_RUNTIME_THREADS = MAX_USERS * MAX_VIEWS_PER_USER

MIDDLEWARES = [
    'middlewares/user_limit_middleware.py::UserLimitMiddleware',
]

# middlewares/user_limit_middleware.py

class UserLimitMiddleware:
    def handle_connection(self, data):
        server = data.server
        connection = data.connection

        if(not server.user_is_connected(connection.user) and
           server.get_connected_user_count() >= server.settings.MAX_USERS):

            return """
                <h1>To many Users</h1>
            """

        return data

    def handle_request(self, data):
        server = data.server
        request = data.request

        CONCURRENT_VIEWS_PER_USER_MAX = \
            server.settings.CONCURRENT_VIEWS_PER_USER_MAX

        # the frontend has to be visible at all times
        if request.frontend:
            return data

        # reconnecting to a already running view doesn't cost us a thread
        if server.view_is_already_running(request):
            return data

        if(server.get_running_views_count(request.user) <
           server.settings.MAX_VIEWS_PER_USER):

            return data

        return """
            <h1>To many Views<h1>
        """