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# -*- coding: utf-8 -*-
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#
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import uuid
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from django.db import models, transaction
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from django.db.models import Q
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from django.utils.translation import ugettext_lazy as _
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from django.utils.translation import ugettext
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from django.core.cache import cache
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from orgs.mixins import OrgModelMixin
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from orgs.utils import set_current_org, get_current_org
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from orgs.models import Organization
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__all__ = ['Node']
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class Node(OrgModelMixin):
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id = models.UUIDField(default=uuid.uuid4, primary_key=True)
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key = models.CharField(unique=True, max_length=64, verbose_name=_("Key")) # '1:1:1:1'
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value = models.CharField(max_length=128, verbose_name=_("Value"))
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child_mark = models.IntegerField(default=0)
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date_create = models.DateTimeField(auto_now_add=True)
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is_node = True
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_assets_amount = None
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_full_value_cache_key = '_NODE_VALUE_{}'
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_assets_amount_cache_key = '_NODE_ASSETS_AMOUNT_{}'
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class Meta:
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verbose_name = _("Node")
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def __str__(self):
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return self.full_value
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def __eq__(self, other):
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if not other:
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return False
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return self.key == other.key
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def __gt__(self, other):
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if self.is_root():
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return True
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self_key = [int(k) for k in self.key.split(':')]
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other_key = [int(k) for k in other.key.split(':')]
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return self_key.__lt__(other_key)
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def __lt__(self, other):
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return not self.__gt__(other)
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@property
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def name(self):
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return self.value
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@property
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def assets_amount(self):
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"""
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获取节点下所有资产数量速度太慢，所以需要重写，使用cache等方案
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:return:
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"""
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if self._assets_amount is not None:
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return self._assets_amount
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cache_key = self._assets_amount_cache_key.format(self.key)
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cached = cache.get(cache_key)
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if cached is not None:
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return cached
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assets_amount = self.get_all_assets().count()
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cache.set(cache_key, assets_amount, 3600)
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return assets_amount
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@assets_amount.setter
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def assets_amount(self, value):
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self._assets_amount = value
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def expire_assets_amount(self):
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ancestor_keys = self.get_ancestor_keys(with_self=True)
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cache_keys = [self._assets_amount_cache_key.format(k) for k in ancestor_keys]
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cache.delete_many(cache_keys)
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@classmethod
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def expire_nodes_assets_amount(cls, nodes=None):
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if nodes:
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for node in nodes:
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node.expire_assets_amount()
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return
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key = cls._assets_amount_cache_key.format('*')
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cache.delete_pattern(key)
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@property
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def full_value(self):
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key = self._full_value_cache_key.format(self.key)
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cached = cache.get(key)
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if cached:
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return cached
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if self.is_root():
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return self.value
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parent_full_value = self.parent.full_value
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value = parent_full_value + ' / ' + self.value
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key = self._full_value_cache_key.format(self.key)
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cache.set(key, value, 3600)
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return value
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def expire_full_value(self):
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key = self._full_value_cache_key.format(self.key)
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cache.delete_pattern(key+'*')
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@classmethod
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def expire_nodes_full_value(cls, nodes=None):
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if nodes:
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for node in nodes:
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node.expire_full_value()
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return
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key = cls._full_value_cache_key.format('*')
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cache.delete_pattern(key+'*')
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@property
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def level(self):
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return len(self.key.split(':'))
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def get_next_child_key(self):
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mark = self.child_mark
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self.child_mark += 1
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self.save()
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return "{}:{}".format(self.key, mark)
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def get_next_child_preset_name(self):
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name = ugettext("New node")
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values = [
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child.value[child.value.rfind(' '):]
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for child in self.get_children()
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if child.value.startswith(name)
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]
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values = [int(value) for value in values if value.strip().isdigit()]
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count = max(values) + 1 if values else 1
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return '{} {}'.format(name, count)
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def create_child(self, value, _id=None):
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with transaction.atomic():
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child_key = self.get_next_child_key()
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child = self.__class__.objects.create(id=_id, key=child_key, value=value)
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return child
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def get_children(self, with_self=False):
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pattern = r'^{0}$|^{0}:[0-9]+$' if with_self else r'^{0}:[0-9]+$'
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return self.__class__.objects.filter(
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key__regex=pattern.format(self.key)
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)
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def get_all_children(self, with_self=False):
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pattern = r'^{0}$|^{0}:' if with_self else r'^{0}'
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return self.__class__.objects.filter(
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key__regex=pattern.format(self.key)
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)
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def get_sibling(self, with_self=False):
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key = ':'.join(self.key.split(':')[:-1])
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pattern = r'^{}:[0-9]+$'.format(key)
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sibling = self.__class__.objects.filter(
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key__regex=pattern.format(self.key)
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)
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if not with_self:
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sibling = sibling.exclude(key=self.key)
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return sibling
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def get_family(self):
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ancestor = self.get_ancestor()
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children = self.get_all_children()
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return [*tuple(ancestor), self, *tuple(children)]
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def get_assets(self):
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from .asset import Asset
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if self.is_default_node():
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assets = Asset.objects.filter(Q(nodes__id=self.id) | Q(nodes__isnull=True))
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else:
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assets = Asset.objects.filter(nodes__id=self.id)
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return assets.distinct()
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def get_valid_assets(self):
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return self.get_assets().valid()
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def get_all_assets(self):
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from .asset import Asset
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pattern = r'^{0}$|^{0}:'.format(self.key)
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args = []
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kwargs = {}
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if self.is_root():
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args.append(Q(nodes__key__regex=pattern) | Q(nodes=None))
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else:
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kwargs['nodes__key__regex'] = pattern
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assets = Asset.objects.filter(*args, **kwargs).distinct()
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return assets
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def get_all_valid_assets(self):
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return self.get_all_assets().valid()
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def is_default_node(self):
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return self.is_root() and self.key == '0'
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def is_root(self):
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if self.key.isdigit():
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return True
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else:
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return False
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@property
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def parent_key(self):
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parent_key = ":".join(self.key.split(":")[:-1])
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return parent_key
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@property
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def parent(self):
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if self.is_root():
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return self
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try:
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parent = self.__class__.objects.get(key=self.parent_key)
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return parent
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except Node.DoesNotExist:
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return self.__class__.root()
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@parent.setter
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def parent(self, parent):
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if not self.is_node:
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self.key = parent.key + ':fake'
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return
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children = self.get_all_children()
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old_key = self.key
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with transaction.atomic():
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self.key = parent.get_next_child_key()
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for child in children:
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child.key = child.key.replace(old_key, self.key, 1)
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child.save()
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self.save()
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def get_ancestor_keys(self, with_self=False):
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parent_keys = []
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key_list = self.key.split(":")
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if not with_self:
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key_list.pop()
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for i in range(len(key_list)):
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parent_keys.append(":".join(key_list))
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key_list.pop()
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return parent_keys
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def get_ancestor(self, with_self=False):
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ancestor_keys = self.get_ancestor_keys(with_self=with_self)
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ancestor = self.__class__.objects.filter(
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key__in=ancestor_keys
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).order_by('key')
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return ancestor
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@classmethod
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def create_root_node(cls):
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# 如果使用current_org 在set_current_org时会死循环
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_current_org = get_current_org()
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with transaction.atomic():
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if not _current_org.is_real():
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return cls.default_node()
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set_current_org(Organization.root())
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org_nodes_roots = cls.objects.filter(key__regex=r'^[0-9]+$')
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org_nodes_roots_keys = org_nodes_roots.values_list('key', flat=True) or ['1']
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key = max([int(k) for k in org_nodes_roots_keys])
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key = str(key + 1) if key != 0 else '2'
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set_current_org(_current_org)
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root = cls.objects.create(key=key, value=_current_org.name)
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return root
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@classmethod
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def root(cls):
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root = cls.objects.filter(key__regex=r'^[0-9]+$')
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if root:
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return root[0]
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else:
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return cls.create_root_node()
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@classmethod
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def default_node(cls):
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defaults = {'value': 'Default'}
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return cls.objects.get_or_create(defaults=defaults, key='1')
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def as_tree_node(self):
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from common.tree import TreeNode
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from ..serializers import NodeSerializer
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name = '{} ({})'.format(self.value, self.assets_amount)
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node_serializer = NodeSerializer(instance=self)
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data = {
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'id': self.key,
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'name': name,
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'title': name,
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'pId': self.parent_key,
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'isParent': True,
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'open': self.is_root(),
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'meta': {
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'node': node_serializer.data,
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'type': 'node'
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}
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}
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tree_node = TreeNode(**data)
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return tree_node
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@classmethod
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def generate_fake(cls, count=100):
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import random
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for i in range(count):
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node = random.choice(cls.objects.all())
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node.create_child('Node {}'.format(i))
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