"""
Celery 任务安全闸：生产环境仅允许「新订单服务号广播」任务执行。
"""
from django.conf import settings

_DISABLED_MSG = 'CELERY_ONLY_ORDER_BROADCAST：非新订单广播任务已禁止执行'


def celery_non_broadcast_blocked():
    """若当前禁止非广播任务，返回说明字符串；否则返回 None。"""
    if getattr(settings, 'CELERY_ONLY_ORDER_BROADCAST', True):
        return _DISABLED_MSG
    return None