############################################################################### # 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)