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import inspect
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from importlib import import_module
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from django.apps import AppConfig
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from django.db.models.signals import post_migrate
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from django.db.models.signals import post_save
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from django.dispatch import receiver
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from django.utils.functional import LazyObject
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from common.decorator import on_transaction_commit
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from common.utils import get_logger
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from common.utils.connection import RedisPubSub
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from notifications.backends import BACKEND
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from users.models import User
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from .models import MessageContent, SystemMsgSubscription, UserMsgSubscription
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from .notifications import SystemMessage
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logger = get_logger(__name__)
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class NewSiteMsgSubPub(LazyObject):
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def _setup(self):
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self._wrapped = RedisPubSub('notifications.SiteMessageCome')
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new_site_msg_chan = NewSiteMsgSubPub()
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@receiver(post_save, sender=MessageContent)
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@on_transaction_commit
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def on_site_message_create(sender, instance, created, **kwargs):
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if not created:
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return
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logger.debug('New site msg created, publish it')
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user_ids = instance.users.all().values_list('id', flat=True)
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user_ids = [str(i) for i in user_ids]
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data = {
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'id': str(instance.id),
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'subject': instance.subject,
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'message': instance.message,
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'users': user_ids
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}
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new_site_msg_chan.publish(data)
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@receiver(post_migrate, dispatch_uid='notifications.signal_handlers.create_system_messages')
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def create_system_messages(app_config: AppConfig, **kwargs):
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try:
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notifications_module = import_module('.notifications', app_config.module.__package__)
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for name, obj in notifications_module.__dict__.items():
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if name.startswith('_'):
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continue
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if not inspect.isclass(obj):
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continue
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if not issubclass(obj, SystemMessage):
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continue
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attrs = obj.__dict__
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if 'message_type_label' not in attrs:
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continue
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if 'category' not in attrs:
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continue
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if 'category_label' not in attrs:
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continue
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message_type = obj.get_message_type()
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sub, created = SystemMsgSubscription.objects.get_or_create(message_type=message_type)
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if created:
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obj.post_insert_to_db(sub)
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logger.info(
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f'Create SystemMsgSubscription: package={app_config.module.__package__} type={message_type}')
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except ModuleNotFoundError:
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pass
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@receiver(post_save, sender=User)
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def on_user_post_save(sender, instance, created, **kwargs):
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if not created:
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return
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receive_backends = []
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# Todo: IDE 识别不了 get_account
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for backend in BACKEND:
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if backend.get_account(instance):
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receive_backends.append(backend)
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UserMsgSubscription.objects.create(user=instance, receive_backends=receive_backends)
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