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# Copyright 2015 Cloudbase Solutions Srl
# 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.
from os_win import constants
from os_win import exceptions as os_win_exc
from os_win import utilsfactory
from oslo_log import log as logging
import nova.conf
from nova import utils
from nova.virt import event as virtevent
from nova.virt.hyperv import serialconsoleops
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
class InstanceEventHandler(object):
# The event listener timeout is set to 0 in order to return immediately
# and avoid blocking the thread.
_WAIT_TIMEOUT = 0
_TRANSITION_MAP = {
constants.HYPERV_VM_STATE_ENABLED: virtevent.EVENT_LIFECYCLE_STARTED,
constants.HYPERV_VM_STATE_DISABLED: virtevent.EVENT_LIFECYCLE_STOPPED,
constants.HYPERV_VM_STATE_PAUSED: virtevent.EVENT_LIFECYCLE_PAUSED,
constants.HYPERV_VM_STATE_SUSPENDED:
virtevent.EVENT_LIFECYCLE_SUSPENDED
}
def __init__(self, state_change_callback=None):
self._vmutils = utilsfactory.get_vmutils()
self._listener = self._vmutils.get_vm_power_state_change_listener(
timeframe=CONF.hyperv.power_state_check_timeframe,
event_timeout=CONF.hyperv.power_state_event_polling_interval,
filtered_states=list(self._TRANSITION_MAP.keys()),
get_handler=True)
self._serial_console_ops = serialconsoleops.SerialConsoleOps()
self._state_change_callback = state_change_callback
def start_listener(self):
utils.spawn_n(self._listener, self._event_callback)
def _event_callback(self, instance_name, instance_power_state):
# Instance uuid set by Nova. If this is missing, we assume that
# the instance was not created by Nova and ignore the event.
instance_uuid = self._get_instance_uuid(instance_name)
if instance_uuid:
self._emit_event(instance_name,
instance_uuid,
instance_power_state)
def _emit_event(self, instance_name, instance_uuid, instance_state):
virt_event = self._get_virt_event(instance_uuid,
instance_state)
utils.spawn_n(self._state_change_callback, virt_event)
utils.spawn_n(self._handle_serial_console_workers,
instance_name, instance_state)
def _handle_serial_console_workers(self, instance_name, instance_state):
if instance_state == constants.HYPERV_VM_STATE_ENABLED:
self._serial_console_ops.start_console_handler(instance_name)
else:
self._serial_console_ops.stop_console_handler(instance_name)
def _get_instance_uuid(self, instance_name):
try:
instance_uuid = self._vmutils.get_instance_uuid(instance_name)
if not instance_uuid:
LOG.warning("Instance uuid could not be retrieved for "
"instance %s. Instance state change event "
"will be ignored.", instance_name)
return instance_uuid
except os_win_exc.HyperVVMNotFoundException:
# The instance has been deleted.
pass
def _get_virt_event(self, instance_uuid, instance_state):
transition = self._TRANSITION_MAP[instance_state]
return virtevent.LifecycleEvent(uuid=instance_uuid,
transition=transition)
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