Hardware introspection daemon for OpenStack Ironic
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# Copyright 2015 NEC Corporation
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""SQLAlchemy models for inspection data and shared database code."""
import contextlib
from oslo_concurrency import lockutils
from oslo_config import cfg
from oslo_db import options as db_opts
from oslo_db.sqlalchemy import enginefacade
from oslo_db.sqlalchemy import models
from oslo_db.sqlalchemy import types as db_types
from sqlalchemy import (Boolean, Column, DateTime, Enum, ForeignKey,
Integer, String, Text)
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import orm
from ironic_inspector import conf # noqa
from ironic_inspector import introspection_state as istate
class ModelBase(models.ModelBase):
__table_args__ = {'mysql_engine': "InnoDB",
'mysql_charset': "utf8"}
Base = declarative_base(cls=ModelBase)
CONF = cfg.CONF
_DEFAULT_SQL_CONNECTION = 'sqlite:///ironic_inspector.sqlite'
_CTX_MANAGER = None
db_opts.set_defaults(CONF, connection=_DEFAULT_SQL_CONNECTION)
_synchronized = lockutils.synchronized_with_prefix("ironic-inspector-")
class Node(Base):
__tablename__ = 'nodes'
uuid = Column(String(36), primary_key=True)
version_id = Column(String(36), server_default='')
state = Column(Enum(*istate.States.all()), nullable=False,
default=istate.States.finished,
server_default=istate.States.finished)
started_at = Column(DateTime, nullable=True)
finished_at = Column(DateTime, nullable=True)
error = Column(Text, nullable=True)
manage_boot = Column(Boolean, nullable=True, default=True)
# version_id is being tracked in the NodeInfo object
# for the sake of consistency. See also SQLAlchemy docs:
# http://docs.sqlalchemy.org/en/latest/orm/versioning.html
__mapper_args__ = {
'version_id_col': version_id,
'version_id_generator': False,
}
class Attribute(Base):
__tablename__ = 'attributes'
uuid = Column(String(36), primary_key=True)
node_uuid = Column(String(36), ForeignKey('nodes.uuid',
name='fk_node_attribute'))
name = Column(String(255), nullable=False)
value = Column(String(255), nullable=True)
class Option(Base):
__tablename__ = 'options'
uuid = Column(String(36), ForeignKey('nodes.uuid'), primary_key=True)
name = Column(String(255), primary_key=True)
value = Column(Text)
class Rule(Base):
__tablename__ = 'rules'
uuid = Column(String(36), primary_key=True)
created_at = Column(DateTime, nullable=False)
description = Column(Text)
# NOTE(dtantsur): in the future we might need to temporary disable a rule
disabled = Column(Boolean, default=False)
conditions = orm.relationship('RuleCondition', lazy='joined',
order_by='RuleCondition.id',
cascade="all, delete-orphan")
actions = orm.relationship('RuleAction', lazy='joined',
order_by='RuleAction.id',
cascade="all, delete-orphan")
class RuleCondition(Base):
__tablename__ = 'rule_conditions'
id = Column(Integer, primary_key=True)
rule = Column(String(36), ForeignKey('rules.uuid'))
op = Column(String(255), nullable=False)
multiple = Column(String(255), nullable=False)
invert = Column(Boolean, default=False)
# NOTE(dtantsur): while all operations now require a field, I can also
# imagine user-defined operations that do not, thus it's nullable.
field = Column(Text)
params = Column(db_types.JsonEncodedDict)
def as_dict(self):
res = self.params.copy()
res['op'] = self.op
res['field'] = self.field
res['multiple'] = self.multiple
res['invert'] = self.invert
return res
class RuleAction(Base):
__tablename__ = 'rule_actions'
id = Column(Integer, primary_key=True)
rule = Column(String(36), ForeignKey('rules.uuid'))
action = Column(String(255), nullable=False)
params = Column(db_types.JsonEncodedDict)
def as_dict(self):
res = self.params.copy()
res['action'] = self.action
return res
def init():
"""Initialize the database.
Method called on service start up, initialize transaction
context manager and try to create db session.
"""
get_writer_session()
def model_query(model, *args, **kwargs):
"""Query helper for simpler session usage.
:param session: if present, the session to use
"""
session = kwargs.get('session') or get_reader_session()
query = session.query(model, *args)
return query
@contextlib.contextmanager
def ensure_transaction(session=None):
session = session or get_writer_session()
with session.begin(subtransactions=True):
yield session
@_synchronized("transaction-context-manager")
def _create_context_manager():
_ctx_mgr = enginefacade.transaction_context()
# TODO(aarefiev): enable foreign keys for SQLite once all unit
# tests with failed constraint will be fixed.
_ctx_mgr.configure(sqlite_fk=False)
return _ctx_mgr
def get_context_manager():
"""Create transaction context manager lazily.
:returns: The transaction context manager.
"""
global _CTX_MANAGER
if _CTX_MANAGER is None:
_CTX_MANAGER = _create_context_manager()
return _CTX_MANAGER
def get_reader_session():
"""Help method to get reader session.
:returns: The reader session.
"""
return get_context_manager().reader.get_sessionmaker()()
def get_writer_session():
"""Help method to get writer session.
:returns: The writer session.
"""
return get_context_manager().writer.get_sessionmaker()()