patch_sites.py 文件源码

def new_get_current(self, request=None):
    from django.conf import settings
    if getattr(settings, 'SITE_ID', ''):
        site_id = settings.SITE_ID
        if site_id not in THREADED_SITE_CACHE:
            with lock:
                site = self.prefetch_related('settings').filter(pk=site_id)[0]
                THREADED_SITE_CACHE[site_id] = site
        return THREADED_SITE_CACHE[site_id]
    elif request:
        host = request.get_host()
        try:
            # First attempt to look up the site by host with or without port.
            if host not in THREADED_SITE_CACHE:
                with lock:
                    site = self.prefetch_related('settings').filter(
                        domain__iexact=host)[0]
                    THREADED_SITE_CACHE[host] = site
            return THREADED_SITE_CACHE[host]
        except Site.DoesNotExist:
            # Fallback to looking up site after stripping port from the host.
            domain, port = split_domain_port(host)
            if domain not in THREADED_SITE_CACHE:
                with lock:
                    site = self.prefetch_related('settings').filter(
                        domain__iexact=domain)[0]
                    THREADED_SITE_CACHE[domain] = site
        return THREADED_SITE_CACHE[domain]

    raise ImproperlyConfigured(
        "You're using the Django \"sites framework\" without having "
        "set the SITE_ID setting. Create a site in your database and "
        "set the SITE_ID setting or pass a request to "
        "Site.objects.get_current() to fix this error."
    )