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92 lines
2.8 KiB
92 lines
2.8 KiB
# -*- coding: utf-8 -*-
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#
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from django.db import models, transaction
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from django.db.models import Max
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from django.utils.translation import ugettext_lazy as _
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from orgs.mixins.models import OrgManager
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from .base import BaseUser
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__all__ = ['AuthBook']
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class AuthBookQuerySet(models.QuerySet):
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def delete(self):
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if self.count() > 1:
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raise PermissionError(_("Bulk delete deny"))
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return super().delete()
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class AuthBookManager(OrgManager):
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pass
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class AuthBook(BaseUser):
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asset = models.ForeignKey('assets.Asset', on_delete=models.CASCADE, verbose_name=_('Asset'))
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is_latest = models.BooleanField(default=False, verbose_name=_('Latest version'))
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version = models.IntegerField(default=1, verbose_name=_('Version'))
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objects = AuthBookManager.from_queryset(AuthBookQuerySet)()
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backend = "db"
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# 用于system user和admin_user的动态设置
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_connectivity = None
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CONN_CACHE_KEY = "ASSET_USER_CONN_{}"
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class Meta:
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verbose_name = _('AuthBook')
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def get_related_assets(self):
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return [self.asset]
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def generate_id_with_asset(self, asset):
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return self.id
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@classmethod
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def get_max_version(cls, username, asset):
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version_max = cls.objects.filter(username=username, asset=asset) \
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.aggregate(Max('version'))
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version_max = version_max['version__max'] or 0
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return version_max
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@classmethod
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def create(cls, **kwargs):
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"""
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使用并发锁机制创建AuthBook对象, (主要针对并发创建 username, asset 相同的对象时)
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并更新其他对象的 is_latest=False (其他对象: 与当前对象的 username, asset 相同)
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同时设置自己的 is_latest=True, version=max_version + 1
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"""
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username = kwargs['username']
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asset = kwargs.get('asset') or kwargs.get('asset_id')
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with transaction.atomic():
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# 使用select_for_update限制并发创建相同的username、asset条目
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instances = cls.objects.select_for_update().filter(username=username, asset=asset)
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instances.filter(is_latest=True).update(is_latest=False)
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max_version = cls.get_max_version(username, asset)
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kwargs.update({
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'version': max_version + 1,
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'is_latest': True
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})
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obj = cls.objects.create(**kwargs)
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return obj
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@property
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def connectivity(self):
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return self.get_asset_connectivity(self.asset)
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@property
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def keyword(self):
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return '{}_#_{}'.format(self.username, str(self.asset.id))
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@property
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def hostname(self):
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return self.asset.hostname
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@property
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def ip(self):
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return self.asset.ip
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def __str__(self):
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return '{}@{}'.format(self.username, self.asset)
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