from functools import lru_cache
from django.conf import settings
from django.utils.module_loading import import_string
from .base import SMSProvider
@lru_cache(maxsize=1)
def get_sms_provider():
    provider_class=import_string(settings.SMS_PROVIDER_CLASS)
    if not issubclass(provider_class,SMSProvider): raise TypeError("SMS_PROVIDER_CLASS باید از SMSProvider ارث‌بری کند.")
    return provider_class()
def reset_sms_provider(): get_sms_provider.cache_clear()