c4848cd472
Quota check for create/delete/resize volume Quota is implemented as a decorator, which can be easy enabled and disabled if wanted. The quota feature uses a reservation system that reserves resources prior to usage. BP https://blueprints.launchpad.net/reddwarf/+spec/quotas Change-Id: I5df82c8f1d7b40311b5d5d7301992607f98e9b2a
109 lines
3.2 KiB
Python
109 lines
3.2 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 OpenStack LLC.
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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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import contextlib
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from sqlalchemy import create_engine
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from sqlalchemy import MetaData
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from sqlalchemy.orm import sessionmaker
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from reddwarf.common import cfg
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from reddwarf.openstack.common import log as logging
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from reddwarf.openstack.common.gettextutils import _
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from reddwarf.db.sqlalchemy import mappers
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_ENGINE = None
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_MAKER = None
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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def configure_db(options, models_mapper=None):
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global _ENGINE
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if not _ENGINE:
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_ENGINE = _create_engine(options)
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if models_mapper:
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models_mapper.map(_ENGINE)
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else:
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from reddwarf.instance import models as base_models
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from reddwarf.dns import models as dns_models
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from reddwarf.extensions.mysql import models as mysql_models
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from reddwarf.guestagent import models as agent_models
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from reddwarf.quota import models as quota_models
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model_modules = [
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base_models,
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dns_models,
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mysql_models,
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agent_models,
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quota_models,
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]
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models = {}
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for module in model_modules:
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models.update(module.persisted_models())
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mappers.map(_ENGINE, models)
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def _create_engine(options):
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engine_args = {
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"pool_recycle": CONF.sql_idle_timeout,
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"echo": CONF.sql_query_log
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}
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LOG.info(_("Creating SQLAlchemy engine with args: %s") % engine_args)
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return create_engine(options['sql_connection'], **engine_args)
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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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if not _ENGINE:
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msg = "***The Database has not been setup!!!***"
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LOG.exception(msg)
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raise RuntimeError(msg)
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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 raw_query(model, autocommit=True, expire_on_commit=False):
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return get_session(autocommit, expire_on_commit).query(model)
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def clean_db():
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global _ENGINE
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meta = MetaData()
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meta.reflect(bind=_ENGINE)
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with contextlib.closing(_ENGINE.connect()) as con:
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trans = con.begin()
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for table in reversed(meta.sorted_tables):
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if table.name != "migrate_version":
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con.execute(table.delete())
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trans.commit()
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def drop_db(options):
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meta = MetaData()
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engine = _create_engine(options)
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meta.bind = engine
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meta.reflect()
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meta.drop_all()
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