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# Copyright (c) 2015 OpenStack Foundation
# All Rights Reserved.
#
# 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.
from sqlalchemy import asc
from sqlalchemy import func
from sqlalchemy import or_
from networking_odl.common import constants as odl_const
from networking_odl.db import models
from neutron.db import api as db_api
from oslo_db import api as oslo_db_api
def check_for_pending_or_processing_ops(session, object_uuid, operation=None):
q = session.query(models.OpendaylightJournal).filter(
or_(models.OpendaylightJournal.state == odl_const.PENDING,
models.OpendaylightJournal.state == odl_const.PROCESSING),
models.OpendaylightJournal.object_uuid == object_uuid)
if operation:
if isinstance(operation, (list, tuple)):
q = q.filter(models.OpendaylightJournal.operation.in_(operation))
else:
q = q.filter(models.OpendaylightJournal.operation == operation)
return session.query(q.exists()).scalar()
def check_for_pending_delete_ops_with_parent(session, object_type, parent_id):
rows = session.query(models.OpendaylightJournal).filter(
or_(models.OpendaylightJournal.state == odl_const.PENDING,
models.OpendaylightJournal.state == odl_const.PROCESSING),
models.OpendaylightJournal.object_type == object_type,
models.OpendaylightJournal.operation == odl_const.ODL_DELETE
).all()
for row in rows:
if parent_id in row.data:
return True
return False
def check_for_pending_or_processing_add(session, router_id, subnet_id):
rows = session.query(models.OpendaylightJournal).filter(
or_(models.OpendaylightJournal.state == odl_const.PENDING,
models.OpendaylightJournal.state == odl_const.PROCESSING),
models.OpendaylightJournal.object_type == odl_const.ODL_ROUTER_INTF,
models.OpendaylightJournal.operation == odl_const.ODL_ADD
).all()
for row in rows:
if router_id in row.data.values() and subnet_id in row.data.values():
return True
return False
def check_for_pending_remove_ops_with_parent(session, parent_id):
rows = session.query(models.OpendaylightJournal).filter(
or_(models.OpendaylightJournal.state == odl_const.PENDING,
models.OpendaylightJournal.state == odl_const.PROCESSING),
models.OpendaylightJournal.object_type == odl_const.ODL_ROUTER_INTF,
models.OpendaylightJournal.operation == odl_const.ODL_REMOVE
).all()
for row in rows:
if parent_id in row.data.values():
return True
return False
def check_for_older_ops(session, row):
q = session.query(models.OpendaylightJournal).filter(
or_(models.OpendaylightJournal.state == odl_const.PENDING,
models.OpendaylightJournal.state == odl_const.PROCESSING),
models.OpendaylightJournal.operation == row.operation,
models.OpendaylightJournal.object_uuid == row.object_uuid,
models.OpendaylightJournal.created_at < row.created_at,
models.OpendaylightJournal.id != row.id)
return session.query(q.exists()).scalar()
def get_all_db_rows(session):
return session.query(models.OpendaylightJournal).all()
def get_all_db_rows_by_state(session, state):
return session.query(models.OpendaylightJournal).filter_by(
state=state).all()
# Retry deadlock exception for Galera DB.
# If two (or more) different threads call this method at the same time, they
# might both succeed in changing the same row to pending, but at least one
# of them will get a deadlock from Galera and will have to retry the operation.
@db_api.retry_db_errors
def get_oldest_pending_db_row_with_lock(session):
with session.begin():
row = session.query(models.OpendaylightJournal).filter_by(
state=odl_const.PENDING).order_by(
asc(models.OpendaylightJournal.last_retried)).with_for_update(
).first()
if row:
update_db_row_state(session, row, odl_const.PROCESSING)
return row
@oslo_db_api.wrap_db_retry(max_retries=db_api.MAX_RETRIES,
retry_on_request=True)
def update_db_row_state(session, row, state):
row.state = state
session.merge(row)
session.flush()
def update_pending_db_row_retry(session, row, retry_count):
if row.retry_count >= retry_count:
update_db_row_state(session, row, odl_const.FAILED)
else:
row.retry_count += 1
update_db_row_state(session, row, odl_const.PENDING)
# This function is currently not used.
# Deleted resources are marked as 'deleted' in the database.
@oslo_db_api.wrap_db_retry(max_retries=db_api.MAX_RETRIES,
retry_on_request=True)
def delete_row(session, row=None, row_id=None):
if row_id:
row = session.query(models.OpendaylightJournal).filter_by(
id=row_id).one()
if row:
session.delete(row)
session.flush()
@oslo_db_api.wrap_db_retry(max_retries=db_api.MAX_RETRIES,
retry_on_request=True)
def create_pending_row(session, object_type, object_uuid,
operation, data):
row = models.OpendaylightJournal(object_type=object_type,
object_uuid=object_uuid,
operation=operation, data=data,
created_at=func.now(),
state=odl_const.PENDING)
session.add(row)
# Keep session flush for unit tests. NOOP for L2/L3 events since calls are
# made inside database session transaction with subtransactions=True.
session.flush()
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