298 lines
8.2 KiB
Python
298 lines
8.2 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 Nicira Networks, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# @author: Somik Behera, Nicira Networks, Inc.
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# @author: Brad Hall, Nicira Networks, Inc.
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# @author: Dan Wendlandt, Nicira Networks, Inc.
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker, exc, joinedload
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from quantum.common import exceptions as q_exc
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from quantum.plugins.cisco.db import models
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_ENGINE = None
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_MAKER = None
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BASE = models.BASE
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def configure_db(options):
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"""
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Establish the database, create an engine if needed, and
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register the models.
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:param options: Mapping of configuration options
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"""
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global _ENGINE
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if not _ENGINE:
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_ENGINE = create_engine(options['sql_connection'],
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echo=False,
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echo_pool=True,
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pool_recycle=3600)
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register_models()
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def clear_db():
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global _ENGINE
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assert _ENGINE
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for table in reversed(BASE.metadata.sorted_tables):
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_ENGINE.execute(table.delete())
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def get_session(autocommit=True, expire_on_commit=False):
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"""Helper method to grab session"""
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global _MAKER, _ENGINE
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if not _MAKER:
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assert _ENGINE
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_MAKER = sessionmaker(bind=_ENGINE,
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autocommit=autocommit,
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expire_on_commit=expire_on_commit)
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return _MAKER()
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def register_models():
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"""Register Models and create properties"""
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global _ENGINE
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assert _ENGINE
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BASE.metadata.create_all(_ENGINE)
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def unregister_models():
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"""Unregister Models, useful clearing out data before testing"""
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global _ENGINE
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assert _ENGINE
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BASE.metadata.drop_all(_ENGINE)
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def _check_duplicate_net_name(tenant_id, net_name):
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session = get_session()
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try:
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net = session.query(models.Network).\
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filter_by(tenant_id=tenant_id, name=net_name).\
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one()
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raise q_exc.NetworkNameExists(tenant_id=tenant_id,
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net_name=net_name, net_id=net.uuid)
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except exc.NoResultFound:
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# this is the "normal" path, as API spec specifies
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# that net-names are unique within a tenant
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pass
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def network_create(tenant_id, name):
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session = get_session()
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_check_duplicate_net_name(tenant_id, name)
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with session.begin():
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net = models.Network(tenant_id, name)
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session.add(net)
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session.flush()
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return net
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def network_list(tenant_id):
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session = get_session()
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return session.query(models.Network).\
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options(joinedload(models.Network.ports)). \
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filter_by(tenant_id=tenant_id).\
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all()
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def network_get(net_id):
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session = get_session()
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try:
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return session.query(models.Network).\
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options(joinedload(models.Network.ports)). \
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filter_by(uuid=net_id).\
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one()
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except exc.NoResultFound, e:
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raise q_exc.NetworkNotFound(net_id=net_id)
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def network_rename(tenant_id, net_id, new_name):
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session = get_session()
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net = network_get(net_id)
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_check_duplicate_net_name(tenant_id, new_name)
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net.name = new_name
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session.merge(net)
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session.flush()
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return net
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def network_destroy(net_id):
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session = get_session()
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try:
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net = session.query(models.Network).\
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filter_by(uuid=net_id).\
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one()
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session.delete(net)
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session.flush()
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return net
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except exc.NoResultFound:
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raise q_exc.NetworkNotFound(net_id=net_id)
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def port_create(net_id, state=None):
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# confirm network exists
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network_get(net_id)
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session = get_session()
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with session.begin():
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port = models.Port(net_id)
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port['state'] = state or 'DOWN'
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session.add(port)
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session.flush()
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return port
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def port_list(net_id):
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session = get_session()
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return session.query(models.Port).\
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options(joinedload(models.Port.network)). \
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filter_by(network_id=net_id).\
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all()
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def port_get(net_id, port_id):
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# confirm network exists
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network_get(net_id)
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session = get_session()
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try:
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return session.query(models.Port).\
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filter_by(uuid=port_id).\
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filter_by(network_id=net_id).\
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one()
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except exc.NoResultFound:
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raise q_exc.PortNotFound(net_id=net_id, port_id=port_id)
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def port_set_state(net_id, port_id, new_state):
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if new_state not in ('ACTIVE', 'DOWN'):
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raise q_exc.StateInvalid(port_state=new_state)
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# confirm network exists
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network_get(net_id)
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port = port_get(net_id, port_id)
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session = get_session()
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port.state = new_state
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session.merge(port)
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session.flush()
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return port
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def port_set_attachment(net_id, port_id, new_interface_id):
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# confirm network exists
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network_get(net_id)
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session = get_session()
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port = port_get(net_id, port_id)
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if new_interface_id != "":
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# We are setting, not clearing, the attachment-id
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if port['interface_id']:
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raise q_exc.PortInUse(net_id=net_id, port_id=port_id,
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att_id=port['interface_id'])
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try:
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port = session.query(models.Port).\
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filter_by(interface_id=new_interface_id).\
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one()
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raise q_exc.AlreadyAttached(net_id=net_id,
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port_id=port_id,
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att_id=new_interface_id,
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att_port_id=port['uuid'])
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except exc.NoResultFound:
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# this is what should happen
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pass
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port.interface_id = new_interface_id
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session.merge(port)
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session.flush()
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return port
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def port_unset_attachment(net_id, port_id):
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# confirm network exists
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network_get(net_id)
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session = get_session()
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port = port_get(net_id, port_id)
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port.interface_id = None
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session.merge(port)
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session.flush()
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return port
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def port_destroy(net_id, port_id):
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# confirm network exists
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network_get(net_id)
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session = get_session()
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try:
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port = session.query(models.Port).\
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filter_by(uuid=port_id).\
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filter_by(network_id=net_id).\
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one()
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if port['interface_id']:
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raise q_exc.PortInUse(net_id=net_id, port_id=port_id,
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att_id=port['interface_id'])
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session.delete(port)
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session.flush()
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return port
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except exc.NoResultFound:
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raise q_exc.PortNotFound(port_id=port_id)
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#methods using just port_id
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def port_get_by_id(port_id):
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session = get_session()
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try:
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return session.query(models.Port).\
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filter_by(uuid=port_id).one()
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except exc.NoResultFound:
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raise q_exc.PortNotFound(port_id=port_id)
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def port_set_attachment_by_id(port_id, new_interface_id):
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session = get_session()
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port = port_get_by_id(port_id)
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if new_interface_id != "":
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if port['interface_id']:
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raise q_exc.PortInUse(port_id=port_id,
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att_id=port['interface_id'])
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try:
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port = session.query(models.Port).\
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filter_by(interface_id=new_interface_id).\
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one()
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raise q_exc.AlreadyAttached(port_id=port_id,
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att_id=new_interface_id,
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att_port_id=port['uuid'])
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except exc.NoResultFound:
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pass
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port.interface_id = new_interface_id
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session.merge(port)
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session.flush()
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return port
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def port_unset_attachment_by_id(port_id):
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session = get_session()
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port = port_get_by_id(port_id)
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port.interface_id = None
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session.merge(port)
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session.flush()
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return port
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