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###############################################################################
# Copyright (c) 2017 Koren Lev (Cisco Systems), Yaron Yogev (Cisco Systems) #
# and others #
# #
# All rights reserved. This program and the accompanying materials #
# are made available under the terms of the Apache License, Version 2.0 #
# which accompanies this distribution, and is available at #
# http://www.apache.org/licenses/LICENSE-2.0 #
###############################################################################
from bson.objectid import ObjectId
from discover.fetcher import Fetcher
from utils.inventory_mgr import InventoryMgr
class CliqueFinder(Fetcher):
link_type_reversed = {}
def __init__(self):
super().__init__()
self.inv = InventoryMgr()
self.inventory = self.inv.inventory_collection
self.links = self.inv.collections["links"]
self.clique_types = self.inv.collections["clique_types"]
self.clique_types_by_type = {}
self.clique_constraints = self.inv.collections["clique_constraints"]
self.cliques = self.inv.collections["cliques"]
def find_cliques_by_link(self, links_list):
return self.links.find({'links': {'$in': links_list}})
def find_links_by_source(self, db_id):
return self.links.find({'source': db_id})
def find_links_by_target(self, db_id):
return self.links.find({'target': db_id})
def find_cliques(self):
self.log.info("scanning for cliques")
clique_types = self.get_clique_types().values()
for clique_type in clique_types:
self.find_cliques_for_type(clique_type)
self.log.info("finished scanning for cliques")
def get_clique_types(self):
if not self.clique_types_by_type:
clique_types = self.clique_types \
.find({"environment": self.get_env()})
default_clique_types = \
self.clique_types.find({'environment': 'ANY'})
for clique_type in clique_types:
focal_point_type = clique_type['focal_point_type']
self.clique_types_by_type[focal_point_type] = clique_type
# if some focal point type does not have an explicit definition in
# clique_types for this specific environment, use the default
# clique type definition with environment=ANY
for clique_type in default_clique_types:
focal_point_type = clique_type['focal_point_type']
if focal_point_type not in self.clique_types_by_type:
self.clique_types_by_type[focal_point_type] = clique_type
return self.clique_types_by_type
def find_cliques_for_type(self, clique_type):
focal_point_type = clique_type["focal_point_type"]
constraint = self.clique_constraints \
.find_one({"focal_point_type": focal_point_type})
constraints = [] if not constraint else constraint["constraints"]
object_type = clique_type["focal_point_type"]
objects_for_focal_point_type = self.inventory.find({
"environment": self.get_env(),
"type": object_type
})
for o in objects_for_focal_point_type:
self.construct_clique_for_focal_point(o, clique_type, constraints)
def rebuild_clique(self, clique):
focal_point_db_id = clique['focal_point']
o = self.inventory.find_one({'_id': focal_point_db_id})
constraint = self.clique_constraints \
.find_one({"focal_point_type": o['type']})
constraints = [] if not constraint else constraint["constraints"]
clique_types = self.get_clique_types()
clique_type = clique_types[o['type']]
new_clique = self.construct_clique_for_focal_point(o, clique_type,
constraints)
if not new_clique:
self.cliques.delete({'_id': clique['_id']})
def construct_clique_for_focal_point(self, o, clique_type, constraints):
# keep a hash of nodes in clique that were visited for each type
# start from the focal point
nodes_of_type = {o["type"]: {str(o["_id"])}}
clique = {
"environment": self.env,
"focal_point": o["_id"],
"focal_point_type": o["type"],
"links": [],
"links_detailed": [],
"constraints": {}
}
for c in constraints:
val = o[c] if c in o else None
clique["constraints"][c] = val
for link_type in clique_type["link_types"]:
self.check_link_type(clique, link_type, nodes_of_type)
# after adding the links to the clique, create/update the clique
if not clique["links"]:
return None
focal_point_obj = self.inventory.find({"_id": clique["focal_point"]})
if not focal_point_obj:
return None
focal_point_obj = focal_point_obj[0]
focal_point_obj["clique"] = True
focal_point_obj.pop("_id", None)
self.cliques.update_one(
{
"environment": self.get_env(),
"focal_point": clique["focal_point"]
},
{'$set': clique},
upsert=True)
clique_document = self.inventory.update_one(
{"_id": clique["focal_point"]},
{'$set': focal_point_obj},
upsert=True)
return clique_document
@staticmethod
def check_constraints(clique, link):
if "attributes" not in link:
return True
attributes = link["attributes"]
constraints = clique["constraints"]
for c in constraints:
if c not in attributes:
continue # constraint not applicable to this link
constr_values = constraints[c]
link_val = attributes[c]
if isinstance(constr_values, list):
if link_val not in constr_values:
return False
elif link_val != constraints[c]:
return False
return True
@staticmethod
def get_link_type_reversed(link_type: str) -> str:
if not CliqueFinder.link_type_reversed.get(link_type):
link_type_parts = link_type.split('-')
link_type_parts.reverse()
CliqueFinder.link_type_reversed[link_type] = \
'-'.join(link_type_parts)
return CliqueFinder.link_type_reversed.get(link_type)
def check_link_type(self, clique, link_type, nodes_of_type):
# check if it's backwards
link_type_reversed = self.get_link_type_reversed(link_type)
# handle case of links like T<-->T
self_linked = link_type == link_type_reversed
use_reversed = False
if not self_linked:
matches = self.links.find_one({
"environment": self.env,
"link_type": link_type_reversed
})
use_reversed = True if matches else False
if self_linked or not use_reversed:
self.check_link_type_forward(clique, link_type, nodes_of_type)
if self_linked or use_reversed:
self.check_link_type_back(clique, link_type, nodes_of_type)
def check_link_type_for_direction(self, clique, link_type, nodes_of_type,
is_reversed=False):
if is_reversed:
link_type = self.get_link_type_reversed(link_type)
from_type = link_type[:link_type.index("-")]
to_type = link_type[link_type.index("-") + 1:]
side_to_match = 'target' if is_reversed else 'source'
other_side = 'target' if not is_reversed else 'source'
match_type = to_type if is_reversed else from_type
if match_type not in nodes_of_type.keys():
return
other_side_type = to_type if not is_reversed else from_type
nodes_to_add = set()
for match_point in nodes_of_type[match_type]:
matches = self.find_matches_for_point(match_point,
clique,
link_type,
side_to_match,
other_side)
nodes_to_add = nodes_to_add | matches
if other_side_type not in nodes_of_type:
nodes_of_type[other_side_type] = set()
nodes_of_type[other_side_type] = \
nodes_of_type[other_side_type] | nodes_to_add
def find_matches_for_point(self, match_point, clique, link_type,
side_to_match, other_side) -> set:
nodes_to_add = set()
matches = self.links.find({
"environment": self.env,
"link_type": link_type,
side_to_match: ObjectId(match_point)
})
for link in matches:
link_id = link["_id"]
if link_id in clique["links"]:
continue
if not self.check_constraints(clique, link):
continue
clique["links"].append(link_id)
clique["links_detailed"].append(link)
other_side_point = str(link[other_side])
nodes_to_add.add(other_side_point)
return nodes_to_add
def check_link_type_forward(self, clique, link_type, nodes_of_type):
self.check_link_type_for_direction(clique, link_type, nodes_of_type,
is_reversed=False)
def check_link_type_back(self, clique, link_type, nodes_of_type):
self.check_link_type_for_direction(clique, link_type, nodes_of_type,
is_reversed=True)
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