4720be6f29
Hyper-V can emit events signaling that an instance was suspended. The issue is that at the moment, there is no lifecycle event defined for this instance state in nova.virt.event. This patch adds this lifecycle event and ensures that the manager will properly handle it. Partially fixes bug: #1428505 Change-Id: I0fad28025785e77ef32b88ff813f39000d9f9e35
118 lines
3.3 KiB
Python
118 lines
3.3 KiB
Python
# Copyright 2013 Red Hat, Inc.
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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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Asynchronous event notifications from virtualization drivers.
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This module defines a set of classes representing data for
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various asynchronous events that can occur in a virtualization
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driver.
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"""
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import time
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from nova.i18n import _
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EVENT_LIFECYCLE_STARTED = 0
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EVENT_LIFECYCLE_STOPPED = 1
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EVENT_LIFECYCLE_PAUSED = 2
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EVENT_LIFECYCLE_RESUMED = 3
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EVENT_LIFECYCLE_SUSPENDED = 4
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NAMES = {
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EVENT_LIFECYCLE_STARTED: _('Started'),
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EVENT_LIFECYCLE_STOPPED: _('Stopped'),
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EVENT_LIFECYCLE_PAUSED: _('Paused'),
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EVENT_LIFECYCLE_RESUMED: _('Resumed'),
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EVENT_LIFECYCLE_SUSPENDED: _('Suspended'),
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}
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class Event(object):
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"""Base class for all events emitted by a hypervisor.
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All events emitted by a virtualization driver are
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subclasses of this base object. The only generic
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information recorded in the base class is a timestamp
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indicating when the event first occurred. The timestamp
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is recorded as fractional seconds since the UNIX epoch.
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"""
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def __init__(self, timestamp=None):
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if timestamp is None:
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self.timestamp = time.time()
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else:
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self.timestamp = timestamp
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def get_timestamp(self):
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return self.timestamp
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def __repr__(self):
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return "<%s: %s>" % (
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self.__class__.__name__,
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self.timestamp)
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class InstanceEvent(Event):
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"""Base class for all instance events.
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All events emitted by a virtualization driver which
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are associated with a virtual domain instance are
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subclasses of this base object. This object records
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the UUID associated with the instance.
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"""
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def __init__(self, uuid, timestamp=None):
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super(InstanceEvent, self).__init__(timestamp)
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self.uuid = uuid
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def get_instance_uuid(self):
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return self.uuid
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def __repr__(self):
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return "<%s: %s, %s>" % (
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self.__class__.__name__,
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self.timestamp,
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self.uuid)
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class LifecycleEvent(InstanceEvent):
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"""Class for instance lifecycle state change events.
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When a virtual domain instance lifecycle state changes,
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events of this class are emitted. The EVENT_LIFECYCLE_XX
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constants defined why lifecycle change occurred. This
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event allows detection of an instance starting/stopping
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without need for polling.
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"""
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def __init__(self, uuid, transition, timestamp=None):
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super(LifecycleEvent, self).__init__(uuid, timestamp)
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self.transition = transition
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def get_transition(self):
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return self.transition
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def get_name(self):
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return NAMES.get(self.transition, _('Unknown'))
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def __repr__(self):
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return "<%s: %s, %s => %s>" % (
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self.__class__.__name__,
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self.timestamp,
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self.uuid,
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self.get_name())
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