109 lines
3.6 KiB
Python
109 lines
3.6 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# coding=utf-8
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# Copyright 2013 Hewlett-Packard Development Company, L.P.
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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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Hold the data and drivers for a distinct node within a given context.
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Each :py:class:`ironic.conductor.resource_manager.NodeManager` instance is a
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semi-singleton, keyed by the node id. It contains references to all
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:py:class:`ironic.conductor.task_manager.TaskManager` which called it. When no
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more TaskManagers reference a given NodeManager, it is automatically destroyed.
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Do not request a NodeManager directly; instead, you should use a TaskManager to
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manage the resource in a given context. See the documentation on TaskManager
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for an example.
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"""
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from stevedore import dispatch
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from ironic.openstack.common import lockutils
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from ironic.openstack.common import log
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from ironic.common import exception
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from ironic.db import api as dbapi
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LOG = log.getLogger(__name__)
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RESOURCE_MANAGER_SEMAPHORE = "node_resource"
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class NodeManager(object):
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"""The data model, state, and drivers to manage a Node."""
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_nodes = {}
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_driver_factory = dispatch.NameDispatchExtensionManager(
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namespace='ironic.drivers',
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check_func=lambda x: True,
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invoke_on_load=True)
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def __init__(self, id, t):
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db = dbapi.get_instance()
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self.id = id
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self.task_refs = [t]
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self.node = db.get_node(id)
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self.ports = db.get_ports_by_node(id)
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def _get_instance(ext, *args, **kwds):
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return ext.obj
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# NOTE(deva): Driver loading here may get refactored, depend on:
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# https://github.com/dreamhost/stevedore/issues/15
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try:
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ref = NodeManager._driver_factory.map(
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[self.node.get('driver')], _get_instance)
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self.driver = ref[0]
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except KeyError:
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raise exception.IronicException(_(
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"Failed to load driver %s.") %
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self.node.get('driver'))
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@classmethod
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@lockutils.synchronized(RESOURCE_MANAGER_SEMAPHORE, 'ironic-')
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def acquire(cls, id, t):
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"""Acquire a NodeManager and associate to a TaskManager."""
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n = cls._nodes.get(id)
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if n:
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n.task_refs.append(t)
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else:
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n = cls(id, t)
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cls._nodes[id] = n
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return n
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@classmethod
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@lockutils.synchronized(RESOURCE_MANAGER_SEMAPHORE, 'ironic-')
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def release(cls, id, t):
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"""Release a NodeManager previously acquired."""
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n = cls._nodes.get(id)
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if not n:
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raise exception.IronicException(_(
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"Release called on node %s for which no lock "
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"has been acquired.") % id)
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try:
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n.task_refs.remove(t)
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except ValueError:
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raise exception.IronicException(_(
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"Can not release node %s because it was not "
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"reserved by this tracker.") % id)
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# Delete the resource when no TaskManager references it.
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if len(n.task_refs) == 0:
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del(cls._nodes[id])
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