152 lines
4.6 KiB
Python
152 lines
4.6 KiB
Python
# GNU MediaGoblin -- federated, autonomous media hosting
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# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from contextlib import contextmanager
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import logging
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import six
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from sqlalchemy import create_engine, event
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from mediagoblin import mg_globals
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from mediagoblin.db.base import Base
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_log = logging.getLogger(__name__)
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from mediagoblin.tools.transition import DISABLE_GLOBALS
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if not DISABLE_GLOBALS:
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from mediagoblin.db.base import Session
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class DatabaseMaster(object):
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def __init__(self, engine):
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self.engine = engine
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for k, v in six.iteritems(Base._decl_class_registry):
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setattr(self, k, v)
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def commit(self):
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Session.commit()
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def save(self, obj):
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Session.add(obj)
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Session.flush()
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def check_session_clean(self):
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for dummy in Session():
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_log.warn("STRANGE: There are elements in the sql session. "
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"Please report this and help us track this down.")
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break
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def reset_after_request(self):
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Session.rollback()
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Session.remove()
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else:
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from sqlalchemy.orm import sessionmaker
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class DatabaseManager(object):
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def __init__(self, engine):
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self.engine = engine
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self.Session = sessionmaker(bind=engine)
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@contextmanager
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def session_scope(self):
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session = self.Session()
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#####################################
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# Functions to emulate DatabaseMaster
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#####################################
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def commit():
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session.commit()
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def save(obj):
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session.add(obj)
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session.flush()
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def check_session_clean():
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# Is this implemented right?
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for dummy in session:
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_log.warn("STRANGE: There are elements in the sql session. "
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"Please report this and help us track this down.")
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break
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def reset_after_request():
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session.rollback()
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session.remove()
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# now attach
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session.commit = commit
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session.save = save
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session.check_session_clean = check_session_clean
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session.reset_after_request = reset_after_request
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#####################################
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try:
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yield session
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finally:
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session.rollback()
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session.close()
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def load_models(app_config):
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import mediagoblin.db.models
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for plugin in mg_globals.global_config.get('plugins', {}).keys():
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_log.debug("Loading %s.models", plugin)
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try:
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__import__(plugin + ".models")
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except ImportError as exc:
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_log.debug("Could not load {0}.models: {1}".format(
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plugin,
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exc))
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def _sqlite_fk_pragma_on_connect(dbapi_con, con_record):
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"""Enable foreign key checking on each new sqlite connection"""
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dbapi_con.execute('pragma foreign_keys=on')
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def _sqlite_disable_fk_pragma_on_connect(dbapi_con, con_record):
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"""
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Disable foreign key checking on each new sqlite connection
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(Good for migrations!)
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"""
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dbapi_con.execute('pragma foreign_keys=off')
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def setup_connection_and_db_from_config(app_config, migrations=False):
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engine = create_engine(app_config['sql_engine'])
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# Enable foreign key checking for sqlite
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if app_config['sql_engine'].startswith('sqlite://'):
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if migrations:
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event.listen(engine, 'connect',
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_sqlite_disable_fk_pragma_on_connect)
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else:
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event.listen(engine, 'connect', _sqlite_fk_pragma_on_connect)
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# logging.getLogger('sqlalchemy.engine').setLevel(logging.INFO)
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Session.configure(bind=engine)
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return DatabaseMaster(engine)
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def check_db_migrations_current(db):
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pass
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