class DjangoSource(ProxySource):
    source_type = 'django_model'

    def load(self):
        """
        Load proxy list from specified source and validate loaded data.

        Each server could be in two forms:
        * simple: "server:port"
        * complex: "server:port:user:pwd"
        """

        now = datetime.now()
        expired = now + timedelta(seconds=self.read_timeout)
        query = Proxy.objects.filter(Q(expiration=None) | Q(expiration__gt=expired))
        lines = u"\n".join([unicode(p) for p in query])
        self.read_time = time.time()
        self.server_list = self.get_server_list(lines)
        self.server_list_iterator = itertools.cycle(self.server_list)


class DjangoProxyList(ProxyList):
    def __init__(self, proxy_type='http', **kwargs):

        self.init_kwargs = deepcopy(kwargs)
        self.source = DjangoSource('django', proxy_type=proxy_type, **kwargs)
        self.source.load()
        self.filter_config = {}
        self.geoip_resolver = None

    def get_random(self):
        """
        Return random server from the list
        """

        if self.source.reload():
            self.apply_filter()
        if self.source.server_list:
            return choice(self.source.server_list)