Newer
Older
# Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import copy, logging
from typing import Dict, List, Optional, Tuple
from common.Constants import DEFAULT_CONTEXT_UUID, INTERDOMAIN_TOPOLOGY_UUID
from common.proto.context_pb2 import ContextId, EndPointId, Link, LinkId
from common.tools.context_queries.Link import add_link_to_topology, get_existing_link_uuids
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
from common.tools.object_factory.Context import json_context_id
from common.tools.object_factory.Link import json_link, json_link_id
from context.client.ContextClient import ContextClient
LOGGER = logging.getLogger(__name__)
class AbstractLink:
def __init__(self, link_uuid : str):
self.__context_client = ContextClient()
self.__link_uuid : str = link_uuid
self.__link : Optional[Link] = None
self.__link_id : Optional[LinkId] = None
# Dict[(device_uuid, endpoint_uuid), abstract EndPointId]
self.__device_endpoint_to_abstract : Dict[Tuple[str, str], EndPointId] = dict()
@property
def uuid(self) -> str: return self.__link_uuid
@property
def link_id(self) -> Optional[LinkId]: return self.__link_id
@property
def link(self) -> Optional[Link]: return self.__link
@staticmethod
def compose_uuid(
device_uuid_a : str, endpoint_uuid_a : str, device_uuid_z : str, endpoint_uuid_z : str
) -> str:
# sort endpoints lexicographically to prevent duplicities
link_endpoint_uuids = sorted([
(device_uuid_a, endpoint_uuid_a),
(device_uuid_z, endpoint_uuid_z)
])
link_uuid = '{:s}/{:s}=={:s}/{:s}'.format(
link_endpoint_uuids[0][0], link_endpoint_uuids[0][1],
link_endpoint_uuids[1][0], link_endpoint_uuids[1][1])
return link_uuid
def initialize(self) -> bool:
if self.__link is not None: return False
existing_link_uuids = get_existing_link_uuids(self.__context_client)
create = self.__link_uuid not in existing_link_uuids
if create:
self._create_empty()
else:
self._load_existing()
# Add abstract link to topologies [INTERDOMAIN_TOPOLOGY_UUID]
context_id = ContextId(**json_context_id(DEFAULT_CONTEXT_UUID))
topology_uuids = [INTERDOMAIN_TOPOLOGY_UUID]
for topology_uuid in topology_uuids:
add_link_to_topology(self.__context_client, context_id, topology_uuid, self.__link_uuid)
return create
def _create_empty(self) -> None:
link = Link(**json_link(self.__link_uuid, endpoint_ids=[]))
self.__context_client.SetLink(link)
self.__link = link
self.__link_id = self.__link.link_id
def _load_existing(self) -> None:
self.__link_id = LinkId(**json_link_id(self.__link_uuid))
self.__link = self.__context_client.GetLink(self.__link_id)
self.__device_endpoint_to_abstract = dict()
# for each endpoint in abstract link, populate internal data structures and mappings
for endpoint_id in self.__link.link_endpoint_ids:
device_uuid : str = endpoint_id.device_id.device_uuid.uuid
endpoint_uuid : str = endpoint_id.endpoint_uuid.uuid
self.__device_endpoint_to_abstract.setdefault((device_uuid, endpoint_uuid), endpoint_id)
def _add_endpoint(self, device_uuid : str, endpoint_uuid : str) -> None:
endpoint_id = self.__link.link_endpoint_ids.add()
endpoint_id.device_id.device_uuid.uuid = device_uuid
endpoint_id.endpoint_uuid.uuid = endpoint_uuid
self.__device_endpoint_to_abstract.setdefault((device_uuid, endpoint_uuid), endpoint_id)
def _remove_endpoint(self, device_uuid : str, endpoint_uuid : str) -> None:
device_endpoint_to_abstract = self.__device_endpoint_to_abstract.get(device_uuid, {})
endpoint_id = device_endpoint_to_abstract.pop(endpoint_uuid, None)
if endpoint_id is not None: self.__link.link_endpoint_ids.remove(endpoint_id)
def update_endpoints(self, link_endpoint_uuids : List[Tuple[str, str]] = []) -> bool:
updated = False
# for each endpoint in abstract link that is not in link; remove from abstract link
device_endpoint_to_abstract = copy.deepcopy(self.__device_endpoint_to_abstract)
for device_uuid, endpoint_uuid in device_endpoint_to_abstract.keys():
if (device_uuid, endpoint_uuid) in link_endpoint_uuids: continue
# remove endpoint_id that is not in link
self._remove_endpoint(device_uuid, endpoint_uuid)
updated = True
# for each endpoint in link that is not in abstract link; add to abstract link
for device_uuid, endpoint_uuid in link_endpoint_uuids:
# if already added; just check endpoint type is not modified
if (device_uuid, endpoint_uuid) in self.__device_endpoint_to_abstract: continue
# otherwise, add it to the abstract device
self._add_endpoint(device_uuid, endpoint_uuid)
updated = True
return updated