# # Copyright 2012 Red Hat, Inc # # 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. """Implementation of Inspector abstraction for libvirt.""" from lxml import etree from oslo_config import cfg from oslo_utils import units import six from ceilometer.compute.pollsters import util from ceilometer.compute.virt import inspector as virt_inspector from ceilometer.i18n import _ from ceilometer.openstack.common import log as logging libvirt = None LOG = logging.getLogger(__name__) OPTS = [ cfg.StrOpt('libvirt_type', default='kvm', help='Libvirt domain type (valid options are: ' 'kvm, lxc, qemu, uml, xen).'), cfg.StrOpt('libvirt_uri', default='', help='Override the default libvirt URI ' '(which is dependent on libvirt_type).'), ] CONF = cfg.CONF CONF.register_opts(OPTS) def retry_on_disconnect(function): def decorator(self, *args, **kwargs): try: return function(self, *args, **kwargs) except libvirt.libvirtError as e: if (e.get_error_code() == libvirt.VIR_ERR_SYSTEM_ERROR and e.get_error_domain() in (libvirt.VIR_FROM_REMOTE, libvirt.VIR_FROM_RPC)): LOG.debug(_('Connection to libvirt broken')) self.connection = None return function(self, *args, **kwargs) else: raise return decorator class LibvirtInspector(virt_inspector.Inspector): per_type_uris = dict(uml='uml:///system', xen='xen:///', lxc='lxc:///') def __init__(self): self.uri = self._get_uri() self.connection = None def _get_uri(self): return CONF.libvirt_uri or self.per_type_uris.get(CONF.libvirt_type, 'qemu:///system') def _get_connection(self): if not self.connection: global libvirt if libvirt is None: libvirt = __import__('libvirt') LOG.debug(_('Connecting to libvirt: %s'), self.uri) self.connection = libvirt.openReadOnly(self.uri) return self.connection @retry_on_disconnect def _lookup_by_uuid(self, instance): instance_name = util.instance_name(instance) try: return self._get_connection().lookupByUUIDString(instance.id) except Exception as ex: if not libvirt or not isinstance(ex, libvirt.libvirtError): raise virt_inspector.InspectorException(six.text_type(ex)) error_code = ex.get_error_code() if (error_code == libvirt.VIR_ERR_SYSTEM_ERROR and ex.get_error_domain() in (libvirt.VIR_FROM_REMOTE, libvirt.VIR_FROM_RPC)): raise msg = _("Error from libvirt while looking up instance " ": " "[Error Code %(error_code)s] " "%(ex)s") % {'name': instance_name, 'id': instance.id, 'error_code': error_code, 'ex': ex} raise virt_inspector.InstanceNotFoundException(msg) def inspect_cpus(self, instance): domain = self._lookup_by_uuid(instance) dom_info = domain.info() return virt_inspector.CPUStats(number=dom_info[3], time=dom_info[4]) def _get_domain_not_shut_off_or_raise(self, instance): instance_name = util.instance_name(instance) domain = self._lookup_by_uuid(instance) state = domain.info()[0] if state == libvirt.VIR_DOMAIN_SHUTOFF: msg = _('Failed to inspect data of instance ' ', ' 'domain state is SHUTOFF.') % { 'name': instance_name, 'id': instance.id} raise virt_inspector.InstanceShutOffException(msg) return domain def inspect_vnics(self, instance): domain = self._get_domain_not_shut_off_or_raise(instance) tree = etree.fromstring(domain.XMLDesc(0)) for iface in tree.findall('devices/interface'): target = iface.find('target') if target is not None: name = target.get('dev') else: continue mac = iface.find('mac') if mac is not None: mac_address = mac.get('address') else: continue fref = iface.find('filterref') if fref is not None: fref = fref.get('filter') params = dict((p.get('name').lower(), p.get('value')) for p in iface.findall('filterref/parameter')) interface = virt_inspector.Interface(name=name, mac=mac_address, fref=fref, parameters=params) dom_stats = domain.interfaceStats(name) stats = virt_inspector.InterfaceStats(rx_bytes=dom_stats[0], rx_packets=dom_stats[1], tx_bytes=dom_stats[4], tx_packets=dom_stats[5]) yield (interface, stats) def inspect_disks(self, instance): domain = self._get_domain_not_shut_off_or_raise(instance) tree = etree.fromstring(domain.XMLDesc(0)) for device in filter( bool, [target.get("dev") for target in tree.findall('devices/disk/target')]): disk = virt_inspector.Disk(device=device) block_stats = domain.blockStats(device) stats = virt_inspector.DiskStats(read_requests=block_stats[0], read_bytes=block_stats[1], write_requests=block_stats[2], write_bytes=block_stats[3], errors=block_stats[4]) yield (disk, stats) def inspect_memory_usage(self, instance, duration=None): instance_name = util.instance_name(instance) domain = self._get_domain_not_shut_off_or_raise(instance) try: memory_stats = domain.memoryStats() if (memory_stats and memory_stats.get('available') and memory_stats.get('unused')): memory_used = (memory_stats.get('available') - memory_stats.get('unused')) # Stat provided from libvirt is in KB, converting it to MB. memory_used = memory_used / units.Ki return virt_inspector.MemoryUsageStats(usage=memory_used) else: msg = _('Failed to inspect memory usage of instance ' ', ' 'can not get info from libvirt.') % { 'name': instance_name, 'id': instance.id} raise virt_inspector.NoDataException(msg) # memoryStats might launch an exception if the method is not supported # by the underlying hypervisor being used by libvirt. except libvirt.libvirtError as e: msg = _('Failed to inspect memory usage of %(instance_uuid)s, ' 'can not get info from libvirt: %(error)s') % { 'instance_uuid': instance.id, 'error': e} raise virt_inspector.NoDataException(msg)