149 lines
4.6 KiB
Python
149 lines
4.6 KiB
Python
# Copyright 2011 VMware, 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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import contextlib
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import debtcollector
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from neutron_lib import exceptions as n_exc
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from oslo_config import cfg
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from oslo_db import api as oslo_db_api
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from oslo_db import exception as db_exc
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from oslo_db.sqlalchemy import session
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from oslo_utils import excutils
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from oslo_utils import uuidutils
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from neutron.db import common_db_mixin
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_FACADE = None
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MAX_RETRIES = 10
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is_deadlock = lambda e: isinstance(e, db_exc.DBDeadlock)
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retry_db_errors = oslo_db_api.wrap_db_retry(
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max_retries=MAX_RETRIES,
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retry_on_request=True,
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exception_checker=is_deadlock
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)
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@contextlib.contextmanager
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def exc_to_retry(exceptions):
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try:
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yield
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except Exception as e:
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with excutils.save_and_reraise_exception() as ctx:
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if isinstance(e, exceptions):
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ctx.reraise = False
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raise db_exc.RetryRequest(e)
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def _create_facade_lazily():
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global _FACADE
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if _FACADE is None:
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_FACADE = session.EngineFacade.from_config(cfg.CONF, sqlite_fk=True)
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return _FACADE
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def get_engine():
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"""Helper method to grab engine."""
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facade = _create_facade_lazily()
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return facade.get_engine()
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def dispose():
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# Don't need to do anything if an enginefacade hasn't been created
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if _FACADE is not None:
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get_engine().pool.dispose()
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def get_session(autocommit=True, expire_on_commit=False, use_slave=False):
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"""Helper method to grab session."""
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facade = _create_facade_lazily()
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return facade.get_session(autocommit=autocommit,
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expire_on_commit=expire_on_commit,
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use_slave=use_slave)
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@contextlib.contextmanager
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def autonested_transaction(sess):
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"""This is a convenience method to not bother with 'nested' parameter."""
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if sess.is_active:
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session_context = sess.begin(nested=True)
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else:
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session_context = sess.begin(subtransactions=True)
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with session_context as tx:
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yield tx
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# Common database operation implementations
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@debtcollector.removals.remove(message="This will be removed in the N cycle.")
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def get_object(context, model, **kwargs):
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with context.session.begin(subtransactions=True):
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return (common_db_mixin.model_query(context, model)
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.filter_by(**kwargs)
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.first())
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@debtcollector.removals.remove(message="This will be removed in the N cycle.")
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def get_objects(context, model, **kwargs):
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with context.session.begin(subtransactions=True):
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return (common_db_mixin.model_query(context, model)
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.filter_by(**kwargs)
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.all())
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@debtcollector.removals.remove(message="This will be removed in the N cycle.")
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def create_object(context, model, values):
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with context.session.begin(subtransactions=True):
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if 'id' not in values and hasattr(model, 'id'):
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values['id'] = uuidutils.generate_uuid()
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db_obj = model(**values)
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context.session.add(db_obj)
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return db_obj.__dict__
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@debtcollector.removals.remove(message="This will be removed in the N cycle.")
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def _safe_get_object(context, model, id, key='id'):
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db_obj = get_object(context, model, **{key: id})
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if db_obj is None:
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raise n_exc.ObjectNotFound(id=id)
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return db_obj
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@debtcollector.removals.remove(message="This will be removed in the N cycle.")
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def update_object(context, model, id, values, key=None):
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with context.session.begin(subtransactions=True):
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kwargs = {}
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if key:
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kwargs['key'] = key
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db_obj = _safe_get_object(context, model, id,
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**kwargs)
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db_obj.update(values)
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db_obj.save(session=context.session)
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return db_obj.__dict__
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@debtcollector.removals.remove(message="This will be removed in the N cycle.")
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def delete_object(context, model, id, key=None):
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with context.session.begin(subtransactions=True):
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kwargs = {}
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if key:
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kwargs['key'] = key
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db_obj = _safe_get_object(context, model, id,
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**kwargs)
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context.session.delete(db_obj)
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