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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, Tuple
from common.proto.context_pb2 import Link, LinkId, LinkIdList, LinkList
from common.rpc_method_wrapper.ServiceExceptions import NotFoundException
from context.service.database.models.LinkModel import LinkModel
from context.service.database.models.RelationModels import LinkEndPointModel, TopologyLinkModel
def link_list_ids(db_engine : Engine) -> LinkIdList:
def callback(session : Session) -> List[Dict]:
obj_list : List[LinkModel] = session.query(LinkModel).all()
#.options(selectinload(LinkModel.topology)).filter_by(context_uuid=context_uuid).one_or_none()
return [obj.dump_id() for obj in obj_list]
return LinkIdList(link_ids=run_transaction(sessionmaker(bind=db_engine), callback))
def link_list_objs(db_engine : Engine) -> LinkList:
def callback(session : Session) -> List[Dict]:
obj_list : List[LinkModel] = session.query(LinkModel).all()
#.options(selectinload(LinkModel.topology)).filter_by(context_uuid=context_uuid).one_or_none()
return [obj.dump() for obj in obj_list]
return LinkList(links=run_transaction(sessionmaker(bind=db_engine), callback))
def link_get(db_engine : Engine, request : LinkId) -> Link:
link_uuid = request.link_uuid.uuid
def callback(session : Session) -> Optional[Dict]:
obj : Optional[LinkModel] = session.query(LinkModel)\
.filter_by(link_uuid=link_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: raise NotFoundException('Link', link_uuid)
return Link(**obj)
def link_set(db_engine : Engine, request : Link) -> bool:
link_uuid = request.link_id.link_uuid.uuid
link_name = request.name
topology_keys : Set[Tuple[str, str]] = set()
related_topologies : List[Dict] = list()
link_endpoints_data : List[Dict] = list()
for endpoint_id in request.link_endpoint_ids:
context_uuid = endpoint_id.topology_id.context_id.context_uuid.uuid
topology_uuid = endpoint_id.topology_id.topology_uuid.uuid
device_uuid = endpoint_id.device_id.device_uuid.uuid
endpoint_uuid = endpoint_id.endpoint_uuid.uuid
link_endpoints_data.append({
'link_uuid' : link_uuid,
'context_uuid' : context_uuid,
'topology_uuid': topology_uuid,
'device_uuid' : device_uuid,
'endpoint_uuid': endpoint_uuid,
})
if len(context_uuid) > 0 and len(topology_uuid) > 0:
topology_key = (context_uuid, topology_uuid)
if topology_key not in topology_keys:
related_topologies.append({
'context_uuid': context_uuid,
'topology_uuid': topology_uuid,
'link_uuid': link_uuid,
})
topology_keys.add(topology_key)
def callback(session : Session) -> None:
obj : Optional[LinkModel] = session.query(LinkModel).with_for_update()\
.filter_by(link_uuid=link_uuid).one_or_none()
is_update = obj is not None
if is_update:
obj.link_name = link_name
session.merge(obj)
else:
session.add(LinkModel(link_uuid=link_uuid, link_name=link_name, created_at=time.time()))
obj : Optional[LinkModel] = session.query(LinkModel)\
.filter_by(link_uuid=link_uuid).one_or_none()
stmt = insert(LinkEndPointModel).values(link_endpoints_data)
stmt = stmt.on_conflict_do_nothing(
index_elements=[
LinkEndPointModel.link_uuid, LinkEndPointModel.context_uuid, LinkEndPointModel.topology_uuid,
LinkEndPointModel.device_uuid, LinkEndPointModel.endpoint_uuid
],
)
session.execute(stmt)
session.execute(insert(TopologyLinkModel).values(related_topologies).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 link_delete(db_engine : Engine, request : LinkId) -> bool:
link_uuid = request.link_uuid.uuid
def callback(session : Session) -> bool:
session.query(TopologyLinkModel).filter_by(link_uuid=link_uuid).delete()
session.query(LinkEndPointModel).filter_by(link_uuid=link_uuid).delete()
num_deleted = session.query(LinkModel).filter_by(link_uuid=link_uuid).delete()
#db_link = session.query(LinkModel).filter_by(link_uuid=link_uuid).one_or_none()
#session.query(LinkModel).filter_by(link_uuid=link_uuid).delete()
return num_deleted > 0
return run_transaction(sessionmaker(bind=db_engine), callback)