135 lines
3.9 KiB
Python
135 lines
3.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 OpenStack LLC
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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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"""SQL backends for the various services."""
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import json
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import eventlet.db_pool
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import sqlalchemy as sql
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from sqlalchemy import types as sql_types
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from sqlalchemy.ext import declarative
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import sqlalchemy.orm
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import sqlalchemy.pool
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import sqlalchemy.engine.url
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from keystone import config
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CONF = config.CONF
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ModelBase = declarative.declarative_base()
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# For exporting to other modules
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Column = sql.Column
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String = sql.String
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ForeignKey = sql.ForeignKey
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DateTime = sql.DateTime
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# Special Fields
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class JsonBlob(sql_types.TypeDecorator):
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impl = sql.Text
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def process_bind_param(self, value, dialect):
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return json.dumps(value)
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def process_result_value(self, value, dialect):
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return json.loads(value)
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class DictBase(object):
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def to_dict(self):
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return dict(self.iteritems())
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def __setitem__(self, key, value):
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setattr(self, key, value)
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def __getitem__(self, key):
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return getattr(self, key)
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def get(self, key, default=None):
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return getattr(self, key, default)
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def __iter__(self):
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self._i = iter(sqlalchemy.orm.object_mapper(self).columns)
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return self
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def next(self):
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n = self._i.next().name
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return n
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def update(self, values):
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"""Make the model object behave like a dict."""
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for k, v in values.iteritems():
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setattr(self, k, v)
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def iteritems(self):
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"""Make the model object behave like a dict.
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Includes attributes from joins.
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"""
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return dict([(k, getattr(self, k)) for k in self])
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#local = dict(self)
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#joined = dict([(k, v) for k, v in self.__dict__.iteritems()
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# if not k[0] == '_'])
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#local.update(joined)
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#return local.iteritems()
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# Backends
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class Base(object):
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_MAKER = None
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_ENGINE = None
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def get_session(self, autocommit=True, expire_on_commit=False):
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"""Return a SQLAlchemy session."""
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if self._MAKER is None or self._ENGINE is None:
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self._ENGINE = self.get_engine()
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self._MAKER = self.get_maker(self._ENGINE,
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autocommit,
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expire_on_commit)
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session = self._MAKER()
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# TODO(termie): we may want to do something similar
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#session.query = nova.exception.wrap_db_error(session.query)
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#session.flush = nova.exception.wrap_db_error(session.flush)
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return session
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def get_engine(self):
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"""Return a SQLAlchemy engine."""
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connection_dict = sqlalchemy.engine.url.make_url(CONF.sql.connection)
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engine_args = {'pool_recycle': CONF.sql.idle_timeout,
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'echo': False,
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'convert_unicode': True
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}
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if 'sqlite' in connection_dict.drivername:
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engine_args['poolclass'] = sqlalchemy.pool.NullPool
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return sql.create_engine(CONF.sql.connection, **engine_args)
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def get_maker(self, engine, autocommit=True, expire_on_commit=False):
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"""Return a SQLAlchemy sessionmaker using the given engine."""
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return sqlalchemy.orm.sessionmaker(bind=engine,
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autocommit=autocommit,
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expire_on_commit=expire_on_commit)
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