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# ~*~ coding: utf-8 ~*~
#
import time
from django.db.models import Prefetch
from common.utils import get_object_or_none, get_logger
from common.struct import Stack
from .models import SystemUser, Label, Node, Asset
logger = get_logger(__file__)
def get_system_user_by_name(name):
system_user = get_object_or_none(SystemUser, name=name)
return system_user
def get_system_user_by_id(id):
system_user = get_object_or_none(SystemUser, id=id)
return system_user
class LabelFilter:
def filter_queryset(self, queryset):
queryset = super().filter_queryset(queryset)
query_keys = self.request.query_params.keys()
all_label_keys = Label.objects.values_list('name', flat=True)
valid_keys = set(all_label_keys) & set(query_keys)
labels_query = {}
for key in valid_keys:
labels_query[key] = self.request.query_params.get(key)
conditions = []
for k, v in labels_query.items():
query = {'labels__name': k, 'labels__value': v}
conditions.append(query)
if conditions:
for kwargs in conditions:
queryset = queryset.filter(**kwargs)
return queryset
class NodeUtil:
def __init__(self, with_assets_amount=False, debug=False):
self.stack = Stack()
self._nodes = {}
self.with_assets_amount = with_assets_amount
self._debug = debug
self.init()
@staticmethod
def sorted_by(node):
return [int(i) for i in node.key.split(':')]
def get_queryset(self):
all_nodes = Node.objects.all()
if self.with_assets_amount:
all_nodes = all_nodes.prefetch_related(
Prefetch('assets', queryset=Asset.objects.all().only('id'))
)
all_nodes = list(all_nodes)
for node in all_nodes:
node._assets = set(node.assets.all())
return all_nodes
def get_all_nodes(self):
all_nodes = sorted(self.get_queryset(), key=self.sorted_by)
guarder = Node(key='', value='Guarder')
guarder._assets = []
all_nodes.append(guarder)
return all_nodes
def push_to_stack(self, node):
# 入栈之前检查
# 如果栈是空的，证明是一颗树的根部
if self.stack.is_empty():
node._full_value = node.value
node._parents = []
else:
# 如果不是根节点,
# 该节点的祖先应该是父节点的祖先加上父节点
# 该节点的名字是父节点的名字+自己的名字
node._parents = [self.stack.top] + self.stack.top._parents
node._full_value = ' / '.join(
[self.stack.top._full_value, node.value]
)
node._children = []
node._all_children = []
self.debug("入栈: {}".format(node.key))
self.stack.push(node)
# 出栈
def pop_from_stack(self):
_node = self.stack.pop()
self.debug("出栈: {} 栈顶: {}".format(_node.key, self.stack.top.key if self.stack.top else None))
self._nodes[_node.key] = _node
if not self.stack.top:
return
if self.with_assets_amount:
self.stack.top._assets.update(_node._assets)
_node._assets_amount = len(_node._assets)
delattr(_node, '_assets')
self.stack.top._children.append(_node)
self.stack.top._all_children.extend([_node] + _node._children)
def init(self):
all_nodes = self.get_all_nodes()
for node in all_nodes:
self.debug("准备: {} 栈顶: {}".format(node.key, self.stack.top.key if self.stack.top else None))
# 入栈之前检查，该节点是不是栈顶节点的子节点
# 如果不是，则栈顶出栈
while self.stack.top and not self.stack.top.is_children(node):
self.pop_from_stack()
self.push_to_stack(node)
# 出栈最后一个
self.debug("剩余: {}".format(', '.join([n.key for n in self.stack])))
def get_nodes_by_queryset(self, queryset):
nodes = []
for n in queryset:
node = self.get_node_by_key(n.key)
if not node:
continue
nodes.append(node)
return nodes
def get_node_by_key(self, key):
return self._nodes.get(key)
def debug(self, msg):
self._debug and logger.debug(msg)
def set_assets_amount(self):
for node in self._nodes.values():
node.assets_amount = node._assets_amount
def set_full_value(self):
for node in self._nodes.values():
node.full_value = node._full_value
@property
def nodes(self):
return list(self._nodes.values())
# 使用给定节点生成一颗树
# 找到他们的祖先节点
# 可选找到他们的子孙节点
def get_family(self, nodes, with_children=False):
tree_nodes = set()
for n in nodes:
node = self.get_node_by_key(n.key)
if not node:
continue
tree_nodes.update(node._parents)
tree_nodes.add(node)
if with_children:
tree_nodes.update(node._children)
return list(tree_nodes)
def get_nodes_parents(self, nodes, with_self=True):
parents = set()
for n in nodes:
node = self.get_node_by_key(n.key)
parents.update(set(node._parents))
if with_self:
parents.add(node)
return parents
def test_node_tree():
tree = NodeUtil()
for node in tree._nodes.values():
print("Check {}".format(node.key))
children_wanted = node.get_all_children().count()
children = len(node._children)
if children != children_wanted:
print("{} children not equal: {} != {}".format(node.key, children, children_wanted))
assets_amount_wanted = node.get_all_assets().count()
if node._assets_amount != assets_amount_wanted:
print("{} assets amount not equal: {} != {}".format(
node.key, node._assets_amount, assets_amount_wanted)
)
full_value_wanted = node.full_value
if node._full_value != full_value_wanted:
print("{} full value not equal: {} != {}".format(
node.key, node._full_value, full_value_wanted)
)
parents_wanted = node.get_ancestor().count()
parents = len(node._parents)
if parents != parents_wanted:
print("{} parents count not equal: {} != {}".format(
node.key, parents, parents_wanted)
)