81 lines
2.8 KiB
Python
81 lines
2.8 KiB
Python
# coding=utf-8
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#
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# Copyright 2013 Hewlett-Packard Development Company, L.P.
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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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from iotronic.common.i18n import _
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from iotronic.db import api as db_api
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from iotronic.objects import base
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class Conductor(base.IotronicObject):
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dbapi = db_api.get_instance()
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fields = {
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'id': int,
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'hostname': str,
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}
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@staticmethod
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def _from_db_object(conductor, db_obj):
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"""Converts a database entity to a formal object."""
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for field in conductor.fields:
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conductor[field] = db_obj[field]
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conductor.obj_reset_changes()
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return conductor
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@base.remotable_classmethod
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def get_by_hostname(cls, context, hostname):
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"""Get a Conductor record by its hostname.
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:param hostname: the hostname on which a Conductor is running
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:returns: a :class:`Conductor` object.
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"""
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db_obj = cls.dbapi.get_conductor(hostname)
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conductor = Conductor._from_db_object(cls(context), db_obj)
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return conductor
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def save(self, context):
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"""Save is not supported by Conductor objects."""
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raise NotImplementedError(
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_('Cannot update a conductor record directly.'))
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@base.remotable
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def refresh(self, context=None):
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"""Loads and applies updates for this Conductor.
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Loads a :class:`Conductor` with the same uuid from the database and
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checks for updated attributes.
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:param context: Security context. NOTE: This should only
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be used internally by the indirection_api.
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Unfortunately, RPC requires context as the first
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argument, even though we don't use it.
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A context should be set when instantiating the
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object, e.g.: Conductor(context)
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"""
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current = self.__class__.get_by_hostname(self._context,
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hostname=self.hostname)
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for field in self.fields:
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if (hasattr(self, base.get_attrname(field)) and
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self[field] != current[field]):
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self[field] = current[field]
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@base.remotable
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def touch(self, context):
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"""Touch this conductor's DB record, marking it as up-to-date."""
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self.dbapi.touch_conductor(self.hostname)
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