def delete_snapshot_nodes(cluster_name, node_path, recursive='0'):
"""删除快照节点所有信息，包括树结构信息(zd_snapshot_tree)和快照数据(zd_znode_snapshot)
"""
if recursive == '0' and not _is_tree_leaf_node(cluster_name, node_path):
return "无法删除非叶子节点！"
node = ZdSnapshotTree.one(cluster_name=cluster_name, node_path=node_path)
if not node:
return "节点不存在！"
# 删除快照节点，同时维护树结构
slot_left, slot_right = node.left, node.right
slot_width = slot_right - slot_left
del_query = ZdSnapshotTree.delete().where(
(ZdSnapshotTree.left.between(slot_left, slot_right)) &
(ZdSnapshotTree.cluster_name == cluster_name)
)
update_left_query = ZdSnapshotTree.update(left=ZdSnapshotTree.left - slot_width).where(
(ZdSnapshotTree.left > slot_right) &
(ZdSnapshotTree.cluster_name == cluster_name)
)
update_right_query = ZdSnapshotTree.update(right=ZdSnapshotTree.right - slot_width).where(
(ZdSnapshotTree.right > slot_right) &
(ZdSnapshotTree.cluster_name == cluster_name)
)
del_query.execute()
update_left_query.execute()
update_right_query.execute()
# 删除快照信息
delete_snapshots(cluster_name, node_path, recursive)
def delete_snapshot_nodes(cluster_name, node_path, recursive="0"):
"""删除快照节点所有信息，包括树结构信息(zd_snapshot_tree)和快照数据(zd_znode_snapshot)
"""
if recursive == "0" and not _is_tree_leaf_node(cluster_name, node_path):
return "无法删除非叶子节点！"
node = ZdSnapshotTree.one(cluster_name=cluster_name, node_path=node_path)
if not node:
return "节点不存在！"
# 删除快照节点，同时维护树结构
slot_left, slot_right = node.left, node.right
slot_width = slot_right - slot_left
del_query = ZdSnapshotTree.delete().where(
(ZdSnapshotTree.left.between(slot_left, slot_right)) & (ZdSnapshotTree.cluster_name == cluster_name)
)
update_left_query = ZdSnapshotTree.update(left=ZdSnapshotTree.left - slot_width).where(
(ZdSnapshotTree.left > slot_right) & (ZdSnapshotTree.cluster_name == cluster_name)
)
update_right_query = ZdSnapshotTree.update(right=ZdSnapshotTree.right - slot_width).where(
(ZdSnapshotTree.right > slot_right) & (ZdSnapshotTree.cluster_name == cluster_name)
)
del_query.execute()
update_left_query.execute()
update_right_query.execute()
# 删除快照信息
delete_snapshots(cluster_name, node_path, recursive)
def _add_tree_node(cluster_name, parent_node, node_path):
"""增加树形结构普通节点，需要保持树形结构
"""
slot_left = parent_node.left
# update left and right value
update_left_query = ZdSnapshotTree.update(left=ZdSnapshotTree.left + 2).where(
(ZdSnapshotTree.left > slot_left) & (ZdSnapshotTree.cluster_name == cluster_name)
)
update_right_query = ZdSnapshotTree.update(right=ZdSnapshotTree.right + 2).where(
(ZdSnapshotTree.right > slot_left) & (ZdSnapshotTree.cluster_name == cluster_name)
)
update_left_query.execute()
update_right_query.execute()
# create new node
child_node = ZdSnapshotTree(cluster_name=cluster_name, node_path=node_path, left=slot_left + 1, right=slot_left + 2)
child_node.save()
def _add_tree_node(cluster_name, parent_node, node_path):
"""增加树形结构普通节点，需要保持树形结构
"""
slot_left = parent_node.left
# update left and right value
update_left_query = ZdSnapshotTree.update(
left=ZdSnapshotTree.left +
2).where((ZdSnapshotTree.left > slot_left)
& (ZdSnapshotTree.cluster_name == cluster_name))
update_right_query = ZdSnapshotTree.update(
right=ZdSnapshotTree.right +
2).where((ZdSnapshotTree.right > slot_left)
& (ZdSnapshotTree.cluster_name == cluster_name))
update_left_query.execute()
update_right_query.execute()
# create new node
child_node = ZdSnapshotTree(cluster_name=cluster_name,
node_path=node_path,
left=slot_left + 1,
right=slot_left + 2)
child_node.save()
