191 lines
5.8 KiB
Python
191 lines
5.8 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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"""
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SQLAlchemy models for glance data
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"""
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import sys
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import datetime
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from sqlalchemy.orm import relationship, backref, exc, object_mapper, validates
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from sqlalchemy import Column, Integer, String
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from sqlalchemy import ForeignKey, DateTime, Boolean, Text
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from sqlalchemy import UniqueConstraint
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from sqlalchemy.ext.declarative import declarative_base
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from glance.common.db.sqlalchemy.session import get_session, get_engine
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from glance.common import exception
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from glance.common import flags
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FLAGS = flags.FLAGS
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BASE = declarative_base()
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#TODO(sirp): ModelBase should be moved out so Glance and Nova can share it
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class ModelBase(object):
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"""Base class for Nova and Glance Models"""
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__table_args__ = {'mysql_engine': 'InnoDB'}
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__table_initialized__ = False
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__prefix__ = 'none'
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__protected_attributes__ = set([
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"created_at", "updated_at", "deleted_at", "deleted"])
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created_at = Column(DateTime, default=datetime.datetime.utcnow)
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updated_at = Column(DateTime, onupdate=datetime.datetime.utcnow)
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deleted_at = Column(DateTime)
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deleted = Column(Boolean, default=False)
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@classmethod
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def all(cls, session=None, deleted=False):
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"""Get all objects of this type"""
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if not session:
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session = get_session()
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return session.query(cls).\
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filter_by(deleted=deleted).\
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all()
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@classmethod
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def count(cls, session=None, deleted=False):
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"""Count objects of this type"""
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if not session:
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session = get_session()
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return session.query(cls).\
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filter_by(deleted=deleted).\
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count()
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@classmethod
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def find(cls, obj_id, session=None, deleted=False):
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"""Find object by 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(cls).\
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filter_by(id=obj_id).\
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filter_by(deleted=deleted).\
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one()
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except exc.NoResultFound:
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new_exc = exception.NotFound("No model for id %s" % obj_id)
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raise new_exc.__class__, new_exc, sys.exc_info()[2]
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@classmethod
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def find_by_str(cls, str_id, session=None, deleted=False):
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"""Find object by str_id"""
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int_id = int(str_id.rpartition('-')[2])
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return cls.find(int_id, session=session, deleted=deleted)
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@property
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def str_id(self):
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"""Get string id of object (generally prefix + '-' + id)"""
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return "%s-%s" % (self.__prefix__, self.id)
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def save(self, session=None):
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"""Save this object"""
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if not session:
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session = get_session()
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session.add(self)
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session.flush()
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def delete(self, session=None):
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"""Delete this object"""
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self.deleted = True
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self.deleted_at = datetime.datetime.utcnow()
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self.save(session=session)
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def update(self, values):
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"""dict.update() behaviour."""
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for k, v in values.iteritems():
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self[k] = v
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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 __iter__(self):
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self._i = iter(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, getattr(self, n)
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def keys(self):
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return self.__dict__.keys()
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def values(self):
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return self.__dict__.values()
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def items(self):
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return self.__dict__.items()
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class Image(BASE, ModelBase):
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"""Represents an image in the datastore"""
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__tablename__ = 'images'
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__prefix__ = 'img'
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id = Column(Integer, primary_key=True)
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name = Column(String(255))
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type = Column(String(30))
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size = Column(Integer)
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status = Column(String(30))
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is_public = Column(Boolean, default=False)
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location = Column(Text)
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@validates('type')
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def validate_type(self, key, type):
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if not type in ('machine', 'kernel', 'ramdisk', 'raw'):
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raise exception.Invalid(
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"Invalid image type '%s' for image." % type)
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return type
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@validates('status')
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def validate_status(self, key, status):
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if not status in ('active', 'queued', 'killed', 'saving'):
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raise exception.Invalid("Invalid status '%s' for image." % status)
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return status
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class ImageProperty(BASE, ModelBase):
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"""Represents an image properties in the datastore"""
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__tablename__ = 'image_properties'
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__prefix__ = 'img-prop'
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__table_args__ = (UniqueConstraint('image_id', 'key'), {})
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id = Column(Integer, primary_key=True)
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image_id = Column(Integer, ForeignKey('images.id'), nullable=False)
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image = relationship(Image, backref=backref('properties'))
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key = Column(String(255), index=True)
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value = Column(Text)
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def register_models():
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"""Register Models and create properties"""
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engine = get_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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engine = get_engine()
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BASE.metadata.drop_all(engine)
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