def get_session(session_key):
    return _engine.SessionStore(session_key)
def get_user(session):
    class Dummy(object):
        pass
    django_request = Dummy()
    django_request.session = session
    return django.contrib.auth.get_user(django_request)
class Connection (SockJSConnection):
   
   def on_open(self, info):
        """
        Определяем сессию django.
        """
        self.django_session = get_session(info.get_cookie('sessionid').value)
        self.user = get_user(self.django_session)

 self.django_session = get_session(info.get_cookie('sessionid').value)

<script language="javascript">
    var sock = new SockJS('/echo');
    // Lets assume we invented simple protocol, where first word is a command name and second is a payload.
    sock.onconnect = function() {
        sock.send('auth,xxx');
        sock.send('echo,bar');
    };
</script>

class EchoConnection(SockJSConnection):
    def on_open(self, info):
        self.authenticated = False
    def on_message(self, msg):
        pack, data = msg.split(',', 1)
        # Ignore all packets except of 'auth' if user is not yet authenticated
        if not self.authenticated and pack != 'auth':
            return
        if pack == 'auth':
            # Decrypt user_id (or user name - you decide). You might want to add salt to the token as well.
            user_id = des_decrypt(data, secret_key)
            # Validate user_id here by making DB call, etc.
            user = get_user(user_id)
            if user is None and user.is_active:
                self.send('error,Invalid user!')
                return
            self.authenticated = True
        elif pack == 'echo':
            self.send(data)

def get_user(session):
    class Dummy(object):
        pass
    django_request = Dummy()
    django_request.session = session
    return django.contrib.auth.get_user(django_request)

import redis
strict_redis = redis.StrictRedis(host='localhost', port=6379, db=0, decode_responses=True)
@sensitive_post_parameters()
@csrf_protect
@never_cache
def login(request, template_name='registration/login.html',
          redirect_field_name=REDIRECT_FIELD_NAME,
          authentication_form=AuthenticationForm,
          current_app=None, extra_context=None):
    """
    Displays the login form and handles the login action.
    """
    redirect_to = request.REQUEST.get(redirect_field_name, '')
    if request.method == "POST":
        form = authentication_form(request, data=request.POST)
        if form.is_valid():
            # Ensure the user-originating redirection url is safe.
            if not is_safe_url(url=redirect_to, host=request.get_host()):
                redirect_to = resolve_url(settings.LOGIN_REDIRECT_URL)
            # Okay, security check complete. Log the user in.
            auth_login(request, form.get_user())
            # мой код дополняющий кеширование сессий ассоциирующихся с айди юзеров
            session_key = request.session.session_key
            user_id = str(form.get_user().id)
            strict_redis.hset(ls.CHAT_REDIS_SESSIONS_STORAGE, session_key, user_id)
            return HttpResponseRedirect(redirect_to)
    else:
        form = authentication_form(request)
    current_site = get_current_site(request)
    context = {
        'form': form,
        redirect_field_name: redirect_to,
        'site': current_site,
        'site_name': current_site.name,
    }
    if extra_context is not None:
        context.update(extra_context)
    return TemplateResponse(request, template_name, context,
                            current_app=current_app)

MIDDLEWARE_CLASSES = (
   """ другие middlewares"""
    'registration.middleware.cookies_test.TestCookieMiddleware'
)

class TestCookieMiddleware(object):
    def process_view(self, request, view_func, view_args, view_kwargs):
        request.session.set_test_cookie()
        return

def get_user(session_key):
    cached_id = strict_redis.hget(ls.CHAT_REDIS_SESSIONS_STORAGE, session_key)
    user = User.objects.get(id=cached_id)
    return user

ws.onopen = function() {
    ws.send ('auth,' + sessionid)
 };