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# 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 time
from sqlalchemy.dialects.postgresql import insert
from sqlalchemy.engine import Engine
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy_cockroachdb import run_transaction
from typing import Dict, List, Optional, Set
from common.proto.context_pb2 import ContextId, Topology, TopologyId, TopologyIdList, TopologyList
from common.rpc_method_wrapper.ServiceExceptions import NotFoundException
from context.service.database.models.RelationModels import TopologyDeviceModel
from context.service.database.models.TopologyModel import TopologyModel
def topology_list_ids(db_engine : Engine, request : ContextId) -> TopologyIdList:
context_uuid = request.context_uuid.uuid
def callback(session : Session) -> List[Dict]:
obj_list : List[TopologyModel] = session.query(TopologyModel).filter_by(context_uuid=context_uuid).all()
#.options(selectinload(ContextModel.topology)).filter_by(context_uuid=context_uuid).one_or_none()
return [obj.dump_id() for obj in obj_list]
return TopologyIdList(topology_ids=run_transaction(sessionmaker(bind=db_engine), callback))
def topology_list_objs(db_engine : Engine, request : ContextId) -> TopologyList:
context_uuid = request.context_uuid.uuid
def callback(session : Session) -> List[Dict]:
obj_list : List[TopologyModel] = session.query(TopologyModel).filter_by(context_uuid=context_uuid).all()
#.options(selectinload(ContextModel.topology)).filter_by(context_uuid=context_uuid).one_or_none()
return [obj.dump() for obj in obj_list]
return TopologyList(topologies=run_transaction(sessionmaker(bind=db_engine), callback))
def topology_get(db_engine : Engine, request : TopologyId) -> Topology:
context_uuid = request.context_id.context_uuid.uuid
topology_uuid = request.topology_uuid.uuid
def callback(session : Session) -> Optional[Dict]:
obj : Optional[TopologyModel] = session.query(TopologyModel)\
.filter_by(context_uuid=context_uuid, topology_uuid=topology_uuid).one_or_none()
return None if obj is None else obj.dump()
obj = run_transaction(sessionmaker(bind=db_engine), callback)
if obj is None:
obj_uuid = '{:s}/{:s}'.format(context_uuid, topology_uuid)
raise NotFoundException('Topology', obj_uuid)
return Topology(**obj)
def topology_set(db_engine : Engine, request : Topology) -> bool:
context_uuid = request.topology_id.context_id.context_uuid.uuid
topology_uuid = request.topology_id.topology_uuid.uuid
topology_name = request.name
device_uuids : Set[str] = set()
devices_to_add : List[Dict] = list()
for device_id in request.device_ids:
device_uuid = device_id.device_uuid.uuid
if device_uuid in device_uuids: continue
devices_to_add.append({
'context_uuid': context_uuid, 'topology_uuid': topology_uuid, 'device_uuid': device_uuid
})
device_uuids.add(device_uuid)
link_uuids : Set[str] = set()
links_to_add : List[Dict] = list()
for link_id in request.link_ids:
link_uuid = link_id.link_uuid.uuid
if link_uuid in link_uuids: continue
links_to_add.append({
'context_uuid': context_uuid, 'topology_uuid': topology_uuid, 'link_uuid': link_uuid
})
link_uuids.add(link_uuid)
def callback(session : Session) -> None:
topology_data = [{
'context_uuid' : context_uuid,
'topology_uuid': topology_uuid,
'topology_name': topology_name,
'created_at' : time.time(),
}]
stmt = insert(TopologyModel).values(topology_data)
stmt = stmt.on_conflict_do_update(
index_elements=[TopologyModel.context_uuid, TopologyModel.topology_uuid],
set_=dict(topology_name = stmt.excluded.topology_name)
)
session.execute(stmt)
if len(devices_to_add) > 0:
session.execute(insert(TopologyDeviceModel).values(devices_to_add).on_conflict_do_nothing(
index_elements=[
TopologyDeviceModel.context_uuid, TopologyDeviceModel.topology_uuid,
TopologyDeviceModel.device_uuid
]
))
#if len(link_to_add) > 0:
# session.execute(insert(TopologyLinkModel).values(links_to_add).on_conflict_do_nothing(
# index_elements=[
# TopologyLinkModel.context_uuid, TopologyLinkModel.topology_uuid,
# TopologyLinkModel.link_uuid
# ]
# ))
run_transaction(sessionmaker(bind=db_engine), callback)
return False # TODO: improve and check if created/updated
def topology_delete(db_engine : Engine, request : TopologyId) -> bool:
context_uuid = request.context_id.context_uuid.uuid
topology_uuid = request.topology_uuid.uuid
def callback(session : Session) -> bool:
num_deleted = session.query(TopologyModel)\
.filter_by(context_uuid=context_uuid, topology_uuid=topology_uuid).delete()
return num_deleted > 0
return run_transaction(sessionmaker(bind=db_engine), callback)