Dynamic SITE_ID thread-safe

# Class for thread-safe SITE_ID object
from threading import local


class SiteID(object):

    def __init__(self):
        self._site_thread_info = local()
        self._site_thread_info.SITE_ID = 1

    def __int__(self):
        return self._site_thread_info.SITE_ID

    def __hash__(self):
        return self._site_thread_info.SITE_ID

    def __str__(self):
        return str(self._site_thread_info.SITE_ID)

    def _set(self, new_id):
        self._site_thread_info.SITE_ID = new_id

# Middleware
from django.conf import settings
from sitiosweb.models import DomainDNS


class SetDynamicSites(object):
    """ Change SITE_ID dinamics with trhead safe """
    def process_request(self, request):
        try:
            current_site = DomainDNS.objects.get(domain=request.get_host()).website
            settings.SITE_ID._set(int(current_site.id))
        except:
            settings.SITE_ID._set(1)
        return None

# Settings
from sitiosweb.site_id_local import SiteID

MIDDLEWARE_CLASSES = (
    'sitiosweb.middleware.DynamicSites.SetDynamicSites',
    ...
)

SITE_ID = SiteID()