305 lines
8.4 KiB
Python
305 lines
8.4 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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import logging
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import sqlalchemy as sql
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from sqlalchemy import create_engine
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from sqlalchemy.exc import DisconnectionError
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from sqlalchemy.orm import sessionmaker, exc
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from quantum.api.api_common import OperationalStatus
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from quantum.common import exceptions as q_exc
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from quantum.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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LOG = logging.getLogger('quantum.db.api')
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class MySQLPingListener(object):
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"""
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Ensures that MySQL connections checked out of the
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pool are alive.
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Borrowed from:
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http://groups.google.com/group/sqlalchemy/msg/a4ce563d802c929f
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"""
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def checkout(self, dbapi_con, con_record, con_proxy):
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try:
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dbapi_con.cursor().execute('select 1')
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except dbapi_con.OperationalError, ex:
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if ex.args[0] in (2006, 2013, 2014, 2045, 2055):
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LOG.warn('Got mysql server has gone away: %s', ex)
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raise DisconnectionError("Database server went away")
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else:
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raise
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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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connection_dict = sql.engine.url.make_url(options['sql_connection'])
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engine_args = {
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'pool_recycle': 3600,
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'echo': False,
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'convert_unicode': True,
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}
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if 'mysql' in connection_dict.drivername:
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engine_args['listeners'] = [MySQLPingListener()]
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_ENGINE = create_engine(options['sql_connection'], **engine_args)
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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 network_create(tenant_id, name, op_status=OperationalStatus.UNKNOWN):
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session = get_session()
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with session.begin():
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net = models.Network(tenant_id, name, op_status)
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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_all_tenant_list():
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session = get_session()
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return session.query(models.Network).all()
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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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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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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_update(net_id, tenant_id, **kwargs):
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session = get_session()
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net = network_get(net_id)
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for key in kwargs.keys():
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net[key] = kwargs[key]
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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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ports = session.query(models.Port).\
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filter_by(network_id=net_id).\
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all()
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for p in ports:
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session.delete(p)
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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 validate_network_ownership(tenant_id, 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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filter_by(uuid=net_id).\
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filter_by(tenant_id=tenant_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 port_create(net_id, state=None, op_status=OperationalStatus.UNKNOWN):
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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, op_status)
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if state is None:
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state = 'DOWN'
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elif state not in ('ACTIVE', 'DOWN'):
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raise q_exc.StateInvalid(port_state=state)
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port['state'] = state
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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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# confirm network exists
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network_get(net_id)
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session = get_session()
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return session.query(models.Port).\
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filter_by(network_id=net_id).\
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all()
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def port_get(port_id, net_id, session=None):
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# confirm network exists
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network_get(net_id)
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if not session:
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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_update(port_id, net_id, **kwargs):
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# confirm network exists
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network_get(net_id)
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port = port_get(port_id, net_id)
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session = get_session()
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for key in kwargs.keys():
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if key == "state":
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if kwargs[key] not in ('ACTIVE', 'DOWN'):
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raise q_exc.StateInvalid(port_state=kwargs[key])
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port[key] = kwargs[key]
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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(port_id, net_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(port_id, net_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(port_id, net_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(port_id, net_id, session)
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port.interface_id = None
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session.add(port)
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session.flush()
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def port_destroy(port_id, net_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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def validate_port_ownership(tenant_id, net_id, port_id, session=None):
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validate_network_ownership(tenant_id, net_id)
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port_get(port_id, net_id)
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