summaryrefslogtreecommitdiffstats
path: root/app/discover/clique_finder.py
blob: 9b5aad27d3864e7d6a1851642b6a3f378a07c283 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
###############################################################################
# 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):
    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 clique_types:
                    self.clique_types_by_type[focal_point_type] = clique_type
            return self.clique_types_by_type

    def find_cliques_for_type(self, clique_type):
        type = clique_type["focal_point_type"]
        constraint = self.clique_constraints.find_one({"focal_point_type": 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']
        constraint = self.clique_constraints.find_one({"focal_point_type": type})
        constraints = [] if not constraint else constraint["constraints"]
        clique_types = self.get_clique_types()
        o = self.inventory.find_one({'_id': focal_point_db_id})
        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"]): 1}}
        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"]:
            # check if it's backwards
            link_type_parts = link_type.split('-')
            link_type_parts.reverse()
            link_type_reversed = '-'.join(link_type_parts)
            matches = self.links.find_one({
                "environment": self.env,
                "link_type": link_type_reversed
            })
            reversed = True if matches else False
            if reversed:
                link_type = link_type_reversed
            from_type = link_type[:link_type.index("-")]
            to_type = link_type[link_type.index("-") + 1:]
            side_to_match = 'target' if reversed else 'source'
            other_side = 'target' if not reversed else 'source'
            match_type = to_type if reversed else from_type
            if match_type not in nodes_of_type.keys():
                continue
            other_side_type = to_type if not reversed else from_type
            for match_point in nodes_of_type[match_type].keys():
                matches = self.links.find({
                    "environment": self.env,
                    "link_type": link_type,
                    side_to_match: ObjectId(match_point)
                })
                for link in matches:
                    id = link["_id"]
                    if id in clique["links"]:
                        continue
                    if not self.check_constraints(clique, link):
                        continue
                    clique["links"].append(id)
                    clique["links_detailed"].append(link)
                    other_side_point = str(link[other_side])
                    if other_side_type not in nodes_of_type:
                        nodes_of_type[other_side_type] = {}
                    nodes_of_type[other_side_type][other_side_point] = 1

        # 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

    def check_constraints(self, 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