677 lines
26 KiB
Python
677 lines
26 KiB
Python
# Copyright 2016 Cloudbase Solutions Srl
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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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Utility class for VM related operations on Hyper-V Clusters.
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"""
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import ctypes
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import re
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import sys
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import threading
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import time
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from eventlet import patcher
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from eventlet import tpool
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from oslo_log import log as logging
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from oslo_utils import excutils
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from six.moves import queue
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from os_win._i18n import _
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from os_win import _utils
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from os_win import constants
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from os_win import exceptions
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from os_win.utils import baseutils
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from os_win.utils.compute import _clusapi_utils
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from os_win.utils.winapi import constants as w_const
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from os_win.utils.winapi.libs import clusapi as clusapi_def
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from os_win.utils.winapi import wintypes
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LOG = logging.getLogger(__name__)
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class ClusterUtils(baseutils.BaseUtils):
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_MSCLUSTER_NODE = 'MSCluster_Node'
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_MSCLUSTER_RES = 'MSCluster_Resource'
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_VM_BASE_NAME = 'Virtual Machine %s'
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_VM_TYPE = 'Virtual Machine'
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_VM_GROUP_TYPE = 111
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_MS_CLUSTER_NAMESPACE = '//%s/root/MSCluster'
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_LIVE_MIGRATION_TYPE = 4
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_IGNORE_LOCKED = 1
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_DESTROY_GROUP = 1
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_FAILBACK_WINDOW_MIN = 0
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_FAILBACK_WINDOW_MAX = 23
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_WMI_EVENT_TIMEOUT_MS = 100
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_WMI_EVENT_CHECK_INTERVAL = 2
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def __init__(self, host='.'):
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self._instance_name_regex = re.compile('Virtual Machine (.*)')
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self._clusapi_utils = _clusapi_utils.ClusApiUtils()
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if sys.platform == 'win32':
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self._init_hyperv_conn(host)
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def _init_hyperv_conn(self, host):
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try:
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self._conn_cluster = self._get_wmi_conn(
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self._MS_CLUSTER_NAMESPACE % host)
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self._cluster = self._conn_cluster.MSCluster_Cluster()[0]
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# extract this node name from cluster's path
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path = self._cluster.path_()
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self._this_node = re.search(r'\\\\(.*)\\root', path,
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re.IGNORECASE).group(1)
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except AttributeError:
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raise exceptions.HyperVClusterException(
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_("Could not initialize cluster wmi connection."))
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def _get_failover_watcher(self):
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raw_query = ("SELECT * FROM __InstanceModificationEvent "
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"WITHIN %(wmi_check_interv)s WHERE TargetInstance ISA "
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"'%(cluster_res)s' AND "
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"TargetInstance.Type='%(cluster_res_type)s' AND "
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"TargetInstance.OwnerNode != PreviousInstance.OwnerNode" %
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{'wmi_check_interv': self._WMI_EVENT_CHECK_INTERVAL,
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'cluster_res': self._MSCLUSTER_RES,
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'cluster_res_type': self._VM_TYPE})
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return self._conn_cluster.watch_for(raw_wql=raw_query)
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def check_cluster_state(self):
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if len(self._get_cluster_nodes()) < 1:
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raise exceptions.HyperVClusterException(
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_("Not enough cluster nodes."))
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def get_node_name(self):
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return self._this_node
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def _get_cluster_nodes(self):
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cluster_assoc = self._conn_cluster.MSCluster_ClusterToNode(
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Antecedent=self._cluster.path_())
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return [x.Dependent for x in cluster_assoc]
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def _get_vm_groups(self):
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assocs = self._conn_cluster.MSCluster_ClusterToResourceGroup(
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GroupComponent=self._cluster.path_())
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resources = [a.PartComponent for a in assocs]
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return (r for r in resources if
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hasattr(r, 'GroupType') and
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r.GroupType == self._VM_GROUP_TYPE)
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def _lookup_vm_group_check(self, vm_name):
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vm = self._lookup_vm_group(vm_name)
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if not vm:
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raise exceptions.HyperVVMNotFoundException(vm_name=vm_name)
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return vm
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def _lookup_vm_group(self, vm_name):
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return self._lookup_res(self._conn_cluster.MSCluster_ResourceGroup,
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vm_name)
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def _lookup_vm_check(self, vm_name):
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vm = self._lookup_vm(vm_name)
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if not vm:
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raise exceptions.HyperVVMNotFoundException(vm_name=vm_name)
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return vm
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def _lookup_vm(self, vm_name):
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vm_name = self._VM_BASE_NAME % vm_name
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return self._lookup_res(self._conn_cluster.MSCluster_Resource, vm_name)
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def _lookup_res(self, resource_source, res_name):
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res = resource_source(Name=res_name)
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n = len(res)
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if n == 0:
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return None
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elif n > 1:
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raise exceptions.HyperVClusterException(
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_('Duplicate resource name %s found.') % res_name)
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else:
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return res[0]
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def get_cluster_node_names(self):
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nodes = self._get_cluster_nodes()
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return [n.Name for n in nodes]
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def get_vm_host(self, vm_name):
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return self._lookup_vm_group_check(vm_name).OwnerNode
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def list_instances(self):
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return [r.Name for r in self._get_vm_groups()]
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def list_instance_uuids(self):
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return [r.Id for r in self._get_vm_groups()]
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def add_vm_to_cluster(self, vm_name, max_failover_count=1,
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failover_period=6, auto_failback=True):
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"""Adds the VM to the Hyper-V Cluster.
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:param vm_name: The name of the VM to be added to the Hyper-V Cluster
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:param max_failover_count: The number of times the Hyper-V Cluster will
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try to failover the VM within the given failover period. If the VM
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will try to failover more than this number of the given
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failover_period, the VM will end up in a failed state.
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:param failover_period: The period (hours) over which the given
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max_failover_count failovers can occur. After this period expired,
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the failover count for the given VM is reset.
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:param auto_failback: boolean, whether the VM will be allowed to
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move back to its original host when it is available again.
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"""
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LOG.debug("Add vm to cluster called for vm %s" % vm_name)
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self._cluster.AddVirtualMachine(vm_name)
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vm_group = self._lookup_vm_group_check(vm_name)
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vm_group.FailoverThreshold = max_failover_count
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vm_group.FailoverPeriod = failover_period
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vm_group.PersistentState = True
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vm_group.AutoFailbackType = int(bool(auto_failback))
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# set the earliest and latest time that the group can be moved
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# back to its preferred node. The unit is in hours.
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vm_group.FailbackWindowStart = self._FAILBACK_WINDOW_MIN
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vm_group.FailbackWindowEnd = self._FAILBACK_WINDOW_MAX
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vm_group.put()
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def bring_online(self, vm_name):
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vm = self._lookup_vm_check(vm_name)
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vm.BringOnline()
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def take_offline(self, vm_name):
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vm = self._lookup_vm_check(vm_name)
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vm.TakeOffline()
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def delete(self, vm_name):
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vm = self._lookup_vm_group_check(vm_name)
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vm.DestroyGroup(self._DESTROY_GROUP)
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def vm_exists(self, vm_name):
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return self._lookup_vm(vm_name) is not None
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def live_migrate_vm(self, vm_name, new_host, timeout=None):
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self._migrate_vm(vm_name, new_host, self._LIVE_MIGRATION_TYPE,
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constants.CLUSTER_GROUP_ONLINE,
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timeout)
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def _migrate_vm(self, vm_name, new_host, migration_type,
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exp_state_after_migr, timeout):
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syntax = w_const.CLUSPROP_SYNTAX_LIST_VALUE_DWORD
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migr_type = wintypes.DWORD(migration_type)
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prop_entries = [
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self._clusapi_utils.get_property_list_entry(
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w_const.CLUS_RESTYPE_NAME_VM, syntax, migr_type),
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self._clusapi_utils.get_property_list_entry(
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w_const.CLUS_RESTYPE_NAME_VM_CONFIG, syntax, migr_type)
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]
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prop_list = self._clusapi_utils.get_property_list(prop_entries)
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flags = (
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w_const.CLUSAPI_GROUP_MOVE_RETURN_TO_SOURCE_NODE_ON_ERROR |
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w_const.CLUSAPI_GROUP_MOVE_QUEUE_ENABLED |
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w_const.CLUSAPI_GROUP_MOVE_HIGH_PRIORITY_START)
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cluster_handle = None
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group_handle = None
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dest_node_handle = None
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try:
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cluster_handle = self._clusapi_utils.open_cluster()
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group_handle = self._clusapi_utils.open_cluster_group(
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cluster_handle, vm_name)
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dest_node_handle = self._clusapi_utils.open_cluster_node(
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cluster_handle, new_host)
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with _ClusterGroupStateChangeListener(cluster_handle,
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vm_name) as listener:
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self._clusapi_utils.move_cluster_group(group_handle,
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dest_node_handle,
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flags,
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prop_list)
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try:
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self._wait_for_cluster_group_migration(
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listener,
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vm_name,
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group_handle,
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exp_state_after_migr,
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timeout)
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except exceptions.ClusterGroupMigrationTimeOut:
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with excutils.save_and_reraise_exception() as ctxt:
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self._cancel_cluster_group_migration(
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listener, vm_name, group_handle,
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exp_state_after_migr, timeout)
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# This is rather unlikely to happen but we're
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# covering it out.
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try:
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self._validate_migration(group_handle,
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vm_name,
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exp_state_after_migr,
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new_host)
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LOG.warning(
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'Cluster group migration completed '
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'successfuly after cancel attempt. '
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'Suppressing timeout exception.')
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ctxt.reraise = False
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except exceptions.ClusterGroupMigrationFailed:
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pass
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else:
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self._validate_migration(group_handle,
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vm_name,
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exp_state_after_migr,
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new_host)
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finally:
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if group_handle:
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self._clusapi_utils.close_cluster_group(group_handle)
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if dest_node_handle:
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self._clusapi_utils.close_cluster_node(dest_node_handle)
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if cluster_handle:
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self._clusapi_utils.close_cluster(cluster_handle)
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def _validate_migration(self, group_handle, group_name,
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expected_state, expected_node):
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state_info = self._clusapi_utils.get_cluster_group_state(group_handle)
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owner_node = state_info['owner_node']
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group_state = state_info['state']
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if (expected_state != group_state or
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expected_node.lower() != owner_node.lower()):
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raise exceptions.ClusterGroupMigrationFailed(
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group_name=group_name,
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expected_state=expected_state,
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expected_node=expected_node,
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group_state=group_state,
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owner_node=owner_node)
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def cancel_cluster_group_migration(self, group_name, expected_state,
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timeout=None):
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cluster_handle = None
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group_handle = None
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try:
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cluster_handle = self._clusapi_utils.open_cluster()
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group_handle = self._clusapi_utils.open_cluster_group(
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cluster_handle, group_name)
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with _ClusterGroupStateChangeListener(cluster_handle,
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group_name) as listener:
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self._cancel_cluster_group_migration(
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listener, group_name, group_handle,
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expected_state, timeout)
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finally:
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if group_handle:
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self._clusapi_utils.close_cluster_group(group_handle)
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if cluster_handle:
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self._clusapi_utils.close_cluster(cluster_handle)
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def _cancel_cluster_group_migration(self, event_listener,
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group_name, group_handle,
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expected_state,
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timeout=None):
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LOG.info("Canceling cluster group '%s' migration", group_name)
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try:
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cancel_finished = (
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self._clusapi_utils.cancel_cluster_group_operation(
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group_handle))
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except exceptions.Win32Exception as ex:
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group_state_info = self._get_cluster_group_state(group_handle)
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migration_pending = self._is_migration_pending(
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group_state_info['state'],
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group_state_info['status_info'],
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expected_state)
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if (ex.error_code == w_const.ERROR_INVALID_STATE and
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not migration_pending):
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LOG.debug('Ignoring group migration cancel error. '
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'No migration is pending.')
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cancel_finished = True
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else:
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raise
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if not cancel_finished:
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LOG.debug("Waiting for group migration to be canceled.")
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try:
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self._wait_for_cluster_group_migration(
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event_listener, group_name, group_handle,
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expected_state,
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timeout=timeout)
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except Exception:
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LOG.exception("Failed to cancel cluster group migration.")
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raise exceptions.JobTerminateFailed()
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LOG.info("Cluster group migration canceled.")
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def _is_migration_queued(self, group_status_info):
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return bool(
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group_status_info &
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w_const.CLUSGRP_STATUS_WAITING_IN_QUEUE_FOR_MOVE)
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def _is_migration_pending(self, group_state, group_status_info,
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expected_state):
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migration_pending = (
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group_state != expected_state or
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self._is_migration_queued(group_status_info))
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return migration_pending
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def _wait_for_cluster_group_migration(self, event_listener,
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group_name, group_handle,
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expected_state,
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timeout=None):
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time_start = time.time()
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time_left = timeout if timeout else 'undefined'
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group_state_info = self._get_cluster_group_state(group_handle)
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group_state = group_state_info['state']
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group_status_info = group_state_info['status_info']
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migration_pending = self._is_migration_pending(
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group_state,
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group_status_info,
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expected_state)
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if not migration_pending:
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return
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while not timeout or time_left > 0:
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time_elapsed = time.time() - time_start
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time_left = timeout - time_elapsed if timeout else 'undefined'
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LOG.debug("Waiting for cluster group '%(group_name)s' "
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"migration to finish. "
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"Time left: %(time_left)s.",
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dict(group_name=group_name,
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time_left=time_left))
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try:
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event = event_listener.get(time_left if timeout else None)
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except queue.Empty:
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break
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group_state = event.get('state', group_state)
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group_status_info = event.get('status_info', group_status_info)
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migration_pending = self._is_migration_pending(group_state,
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group_status_info,
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expected_state)
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if not migration_pending:
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return
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LOG.error("Cluster group migration timed out.")
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raise exceptions.ClusterGroupMigrationTimeOut(
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group_name=group_name,
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time_elapsed=time.time() - time_start)
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def get_cluster_group_state_info(self, group_name):
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"""Gets cluster group state info.
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:return: a dict containing the following keys:
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['state', 'migration_queued', 'owner_node']
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"""
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cluster_handle = None
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group_handle = None
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try:
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cluster_handle = self._clusapi_utils.open_cluster()
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group_handle = self._clusapi_utils.open_cluster_group(
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cluster_handle, group_name)
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state_info = self._get_cluster_group_state(group_handle)
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migration_queued = self._is_migration_queued(
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state_info['status_info'])
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return dict(owner_node=state_info['owner_node'],
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state=state_info['state'],
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migration_queued=migration_queued)
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finally:
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if group_handle:
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self._clusapi_utils.close_cluster_group(group_handle)
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if cluster_handle:
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self._clusapi_utils.close_cluster(cluster_handle)
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def _get_cluster_group_state(self, group_handle):
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state_info = self._clusapi_utils.get_cluster_group_state(group_handle)
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buff, buff_sz = self._clusapi_utils.cluster_group_control(
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group_handle,
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w_const.CLUSCTL_GROUP_GET_RO_COMMON_PROPERTIES)
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status_info = self._clusapi_utils.get_cluster_group_status_info(
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ctypes.byref(buff), buff_sz)
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state_info['status_info'] = status_info
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return state_info
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def _monitor_vm_failover(self, watcher, callback,
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event_timeout_ms=_WMI_EVENT_TIMEOUT_MS):
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"""Creates a monitor to check for new WMI MSCluster_Resource
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events.
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This method will poll the last _WMI_EVENT_CHECK_INTERVAL + 1
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seconds for new events and listens for _WMI_EVENT_TIMEOUT_MS
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milliseconds, since listening is a thread blocking action.
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Any event object caught will then be processed.
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"""
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vm_name = None
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new_host = None
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try:
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# wait for new event for _WMI_EVENT_TIMEOUT_MS milliseconds.
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if patcher.is_monkey_patched('thread'):
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wmi_object = tpool.execute(watcher,
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event_timeout_ms)
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else:
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wmi_object = watcher(event_timeout_ms)
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old_host = wmi_object.previous.OwnerNode
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new_host = wmi_object.OwnerNode
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# wmi_object.Name field is of the form:
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# 'Virtual Machine nova-instance-template'
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# wmi_object.Name filed is a key and as such is not affected
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# by locale, so it will always be 'Virtual Machine'
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match = self._instance_name_regex.search(wmi_object.Name)
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if match:
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vm_name = match.group(1)
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if vm_name:
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try:
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callback(vm_name, old_host, new_host)
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except Exception:
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LOG.exception(
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"Exception during failover callback.")
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|
except exceptions.x_wmi_timed_out:
|
|
pass
|
|
|
|
def get_vm_owner_change_listener(self):
|
|
def listener(callback):
|
|
watcher = self._get_failover_watcher()
|
|
|
|
while True:
|
|
# We avoid setting an infinite timeout in order to let
|
|
# the process gracefully stop. Note that the os-win WMI
|
|
# event listeners are meant to be used as long running
|
|
# daemons, so no stop API is provided ATM.
|
|
try:
|
|
self._monitor_vm_failover(
|
|
watcher,
|
|
callback,
|
|
constants.DEFAULT_WMI_EVENT_TIMEOUT_MS)
|
|
except Exception:
|
|
LOG.exception("The VM cluster group owner change "
|
|
"event listener encountered an "
|
|
"unexpected exception.")
|
|
time.sleep(constants.DEFAULT_WMI_EVENT_TIMEOUT_MS / 1000)
|
|
|
|
return listener
|
|
|
|
|
|
# At the moment, those event listeners are not meant to be used outside
|
|
# os-win, mostly because of the underlying API limitations.
|
|
class _ClusterEventListener(object):
|
|
_notif_keys = {}
|
|
_notif_port_h = None
|
|
_cluster_handle = None
|
|
_running = False
|
|
|
|
def __init__(self, cluster_handle, notif_filters_list):
|
|
self._cluster_handle = cluster_handle
|
|
self._notif_filters_list = notif_filters_list
|
|
|
|
self._clusapi_utils = _clusapi_utils.ClusApiUtils()
|
|
self._event_queue = queue.Queue()
|
|
|
|
self._setup()
|
|
|
|
def __enter__(self):
|
|
self._ensure_listener_running()
|
|
return self
|
|
|
|
def _get_notif_key_dw(self, notif_key):
|
|
notif_key_dw = self._notif_keys.get(notif_key)
|
|
if notif_key_dw is None:
|
|
notif_key_dw = wintypes.DWORD(notif_key)
|
|
# We have to make sure those addresses are preserved.
|
|
self._notif_keys[notif_key] = notif_key_dw
|
|
return notif_key_dw
|
|
|
|
def _add_filter(self, notif_filter, notif_key=0):
|
|
notif_key_dw = self._get_notif_key_dw(notif_key)
|
|
|
|
# We'll get a notification handle if not already existing.
|
|
self._notif_port_h = self._clusapi_utils.create_cluster_notify_port_v2(
|
|
self._cluster_handle, notif_filter,
|
|
self._notif_port_h, notif_key_dw)
|
|
|
|
def _setup_notif_port(self):
|
|
for notif_filter in self._notif_filters_list:
|
|
filter_struct = clusapi_def.NOTIFY_FILTER_AND_TYPE(
|
|
dwObjectType=notif_filter['object_type'],
|
|
FilterFlags=notif_filter['filter_flags'])
|
|
notif_key = notif_filter.get('notif_key', 0)
|
|
|
|
self._add_filter(filter_struct, notif_key)
|
|
|
|
def _setup(self):
|
|
self._setup_notif_port()
|
|
|
|
# If eventlet monkey patching is used, this will actually be a
|
|
# greenthread. We just don't want to enforce eventlet usage.
|
|
worker = threading.Thread(target=self._listen)
|
|
worker.setDaemon(True)
|
|
|
|
self._running = True
|
|
worker.start()
|
|
|
|
def __exit__(self, exc_type, exc_value, traceback):
|
|
self.stop()
|
|
|
|
def _signal_stopped(self):
|
|
self._running = False
|
|
self._event_queue.put(None)
|
|
|
|
def stop(self):
|
|
self._signal_stopped()
|
|
|
|
if self._notif_port_h:
|
|
self._clusapi_utils.close_cluster_notify_port(self._notif_port_h)
|
|
|
|
def _listen(self):
|
|
while self._running:
|
|
try:
|
|
# We're using an indefinite timeout here. When the listener is
|
|
# closed, this will raise an 'invalid handle value' error,
|
|
# which we're going to ignore.
|
|
event = _utils.avoid_blocking_call(
|
|
self._clusapi_utils.get_cluster_notify_v2,
|
|
self._notif_port_h,
|
|
timeout_ms=-1)
|
|
|
|
processed_event = self._process_event(event)
|
|
if processed_event:
|
|
self._event_queue.put(processed_event)
|
|
except Exception:
|
|
if self._running:
|
|
LOG.exception(
|
|
"Unexpected exception in event listener loop. "
|
|
"The cluster event listener will now close.")
|
|
self._signal_stopped()
|
|
|
|
def _process_event(self, event):
|
|
return event
|
|
|
|
def get(self, timeout=None):
|
|
self._ensure_listener_running()
|
|
|
|
event = self._event_queue.get(timeout=timeout)
|
|
|
|
self._ensure_listener_running()
|
|
return event
|
|
|
|
def _ensure_listener_running(self):
|
|
if not self._running:
|
|
raise exceptions.OSWinException(
|
|
_("Cluster event listener is not running."))
|
|
|
|
|
|
class _ClusterGroupStateChangeListener(_ClusterEventListener):
|
|
_NOTIF_KEY_GROUP_STATE = 0
|
|
_NOTIF_KEY_GROUP_COMMON_PROP = 1
|
|
|
|
_notif_filters_list = [
|
|
dict(object_type=w_const.CLUSTER_OBJECT_TYPE_GROUP,
|
|
filter_flags=w_const.CLUSTER_CHANGE_GROUP_STATE_V2,
|
|
notif_key=_NOTIF_KEY_GROUP_STATE),
|
|
dict(object_type=w_const.CLUSTER_OBJECT_TYPE_GROUP,
|
|
filter_flags=w_const.CLUSTER_CHANGE_GROUP_COMMON_PROPERTY_V2,
|
|
notif_key=_NOTIF_KEY_GROUP_COMMON_PROP)]
|
|
|
|
def __init__(self, cluster_handle, group_name=None):
|
|
self._group_name = group_name
|
|
|
|
super(_ClusterGroupStateChangeListener, self).__init__(
|
|
cluster_handle, self._notif_filters_list)
|
|
|
|
def _process_event(self, event):
|
|
group_name = event['cluster_object_name']
|
|
if self._group_name and self._group_name.lower() != group_name.lower():
|
|
return
|
|
|
|
preserved_keys = ['cluster_object_name', 'object_type',
|
|
'filter_flags', 'notif_key']
|
|
processed_event = {key: event[key] for key in preserved_keys}
|
|
|
|
notif_key = event['notif_key']
|
|
if notif_key == self._NOTIF_KEY_GROUP_STATE:
|
|
if event['buff_sz'] != ctypes.sizeof(wintypes.DWORD):
|
|
raise exceptions.ClusterPropertyRetrieveFailed()
|
|
state_p = ctypes.cast(event['buff'], wintypes.PDWORD)
|
|
state = state_p.contents.value
|
|
processed_event['state'] = state
|
|
return processed_event
|
|
elif notif_key == self._NOTIF_KEY_GROUP_COMMON_PROP:
|
|
try:
|
|
status_info = (
|
|
self._clusapi_utils.get_cluster_group_status_info(
|
|
ctypes.byref(event['buff']), event['buff_sz']))
|
|
processed_event['status_info'] = status_info
|
|
return processed_event
|
|
except exceptions.ClusterPropertyListEntryNotFound:
|
|
# At the moment, we only care about the 'StatusInformation'
|
|
# common property.
|
|
pass
|