245 lines
9.8 KiB
Python
245 lines
9.8 KiB
Python
#
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# Copyright 2012 Red Hat, Inc
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# (C) Copyright 2015-2016 Hewlett Packard Enterprise Development LP
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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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"""Implementation of Inspector abstraction for libvirt."""
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import logging
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from lxml import etree
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import os
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from oslo_utils import units
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from monasca_agent.collector.virt import inspector as virt_inspector
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import monasca_agent.common.config as configuration
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import monasca_agent.common.util as util
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libvirt = None
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log = logging.getLogger(__name__)
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# Relevant configuration options must be set in 'conf.d/libvirt.yaml'
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# file under 'init_config'.
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# eg.
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# init_config:
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# libvirt_type: kvm
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# libvirt_uri: qemu:///system
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#
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# 'libvirt_type' valid choices: ('kvm', 'lxc', 'qemu', 'uml', 'xen')
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# 'libvirt_uri' is dependent on 'libvirt_type'
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paths = util.Paths()
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conf_path = os.path.join(paths.get_confd_path(), 'libvirt.yaml')
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config = configuration.Config()
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if os.path.exists(conf_path):
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try:
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check_config = config.check_yaml(conf_path)
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except Exception as e:
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log.exception('Unable to parse yaml config in {}\n{}'
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.format(conf_path, str(e)))
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else:
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log.debug('No conf.d/libvirt.yaml found for virt/libvirt/inspector.py')
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init_config = check_config.get('init_config', {})
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if init_config is None:
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init_config = {}
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def retry_on_disconnect(function):
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def decorator(self, *args, **kwargs):
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try:
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return function(self, *args, **kwargs)
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except libvirt.libvirtError as e:
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if (e.get_error_code() == libvirt.VIR_ERR_SYSTEM_ERROR and
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e.get_error_domain() in (libvirt.VIR_FROM_REMOTE,
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libvirt.VIR_FROM_RPC)):
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self.connection = None
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return function(self, *args, **kwargs)
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else:
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raise
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return decorator
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class LibvirtInspector(virt_inspector.Inspector):
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per_type_uris = dict(uml='uml:///system', xen='xen:///', lxc='lxc:///')
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def __init__(self):
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self.uri = self._get_uri()
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self.connection = None
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def _get_uri(self):
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return init_config.get('libvirt_uri') or \
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self.per_type_uris.get(init_config.get('libvirt_type'),
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'qemu:///system')
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def _get_connection(self):
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if not self.connection:
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global libvirt
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if libvirt is None:
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libvirt = __import__('libvirt')
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self.connection = libvirt.openReadOnly(self.uri)
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return self.connection
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@retry_on_disconnect
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def _lookup_by_uuid(self, instance):
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instance_name = instance.name()
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try:
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return self._get_connection().lookupByUUIDString(instance.UUIDString())
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except Exception as ex:
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if not libvirt or not isinstance(ex, libvirt.libvirtError):
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raise virt_inspector.InspectorException(str(ex))
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error_code = ex.get_error_code()
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if (error_code == libvirt.VIR_ERR_SYSTEM_ERROR and
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ex.get_error_domain() in (libvirt.VIR_FROM_REMOTE,
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libvirt.VIR_FROM_RPC)):
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raise
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msg = ("Error from libvirt while looking up instance "
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"<name=%(name)s, id=%(id)s>: "
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"[Error Code %(error_code)s] "
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"%(ex)s") % {'name': instance_name,
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'id': instance.ID(),
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'error_code': error_code,
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'ex': ex}
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raise virt_inspector.InstanceNotFoundException(msg)
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def inspect_cpus(self, instance):
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domain = self._lookup_by_uuid(instance)
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dom_info = domain.info()
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return virt_inspector.CPUStats(number=dom_info[3], time=dom_info[4])
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def _get_domain_not_shut_off_or_raise(self, instance):
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instance_name = instance.name()
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domain = self._lookup_by_uuid(instance)
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state = domain.info()[0]
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if state == libvirt.VIR_DOMAIN_SHUTOFF:
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msg = ('Failed to inspect data of instance '
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'<name=%(name)s, id=%(id)s>, '
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'domain state is SHUTOFF.') % {
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'name': instance_name, 'id': instance.ID()}
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raise virt_inspector.InstanceShutOffException(msg)
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return domain
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def inspect_vnics(self, instance):
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domain = self._get_domain_not_shut_off_or_raise(instance)
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tree = etree.fromstring(domain.XMLDesc(0))
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for iface in tree.findall('devices/interface'):
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target = iface.find('target')
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if target is not None:
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name = target.get('dev')
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else:
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continue
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mac = iface.find('mac')
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if mac is not None:
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mac_address = mac.get('address')
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else:
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continue
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fref = iface.find('filterref')
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if fref is not None:
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fref = fref.get('filter')
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params = dict((p.get('name').lower(), p.get('value'))
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for p in iface.findall('filterref/parameter'))
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interface = virt_inspector.Interface(name=name, mac=mac_address,
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fref=fref, parameters=params)
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dom_stats = domain.interfaceStats(name)
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stats = virt_inspector.InterfaceStats(rx_bytes=dom_stats[0],
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rx_packets=dom_stats[1],
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rx_errors=dom_stats[2],
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rx_dropped=dom_stats[3],
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tx_bytes=dom_stats[4],
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tx_packets=dom_stats[5],
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tx_errors=dom_stats[6],
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tx_dropped=dom_stats[7])
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yield (interface, stats)
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def inspect_disks(self, instance):
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domain = self._get_domain_not_shut_off_or_raise(instance)
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tree = etree.fromstring(domain.XMLDesc(0))
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for device in filter(
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bool,
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[target.get("dev")
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for target in tree.findall('devices/disk/target')]):
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disk = virt_inspector.Disk(device=device)
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block_stats = domain.blockStats(device)
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stats = virt_inspector.DiskStats(read_requests=block_stats[0],
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read_bytes=block_stats[1],
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write_requests=block_stats[2],
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write_bytes=block_stats[3],
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errors=block_stats[4])
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yield (disk, stats)
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def inspect_memory_usage(self, instance, duration=None):
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instance_name = instance.name()
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domain = self._get_domain_not_shut_off_or_raise(instance)
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try:
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memory_stats = domain.memoryStats()
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if (memory_stats and
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memory_stats.get('available') and
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memory_stats.get('unused')):
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memory_used = (memory_stats.get('available') -
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memory_stats.get('unused'))
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# Stat provided from libvirt is in KB, converting it to MB.
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memory_used = memory_used / units.Ki
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return virt_inspector.MemoryUsageStats(usage=memory_used)
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else:
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msg = ('Failed to inspect memory usage of instance '
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'<name=%(name)s, id=%(id)s>, '
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'can not get info from libvirt.') % {
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'name': instance_name, 'id': instance.ID()}
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raise virt_inspector.NoDataException(msg)
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# memoryStats might launch an exception if the method is not supported
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# by the underlying hypervisor being used by libvirt.
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except libvirt.libvirtError as e:
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msg = ('Failed to inspect memory usage of %(instance_uuid)s, '
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'can not get info from libvirt: %(error)s') % {
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'instance_uuid': domain.ID(), 'error': e}
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raise virt_inspector.NoDataException(msg)
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def inspect_disk_info(self, instance):
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domain = self._get_domain_not_shut_off_or_raise(instance)
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tree = etree.fromstring(domain.XMLDesc(0))
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for disk in tree.findall('devices/disk'):
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disk_type = disk.get('type')
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if disk_type:
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if disk_type == 'network':
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log.debug('Inspection disk usage of network disk '
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'%(instance_uuid)s unsupported by libvirt' % {
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'instance_uuid': instance.ID()})
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continue
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target = disk.find('target')
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device = target.get('dev')
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if device:
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dsk = virt_inspector.Disk(device=device)
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block_info = domain.blockInfo(device)
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info = virt_inspector.DiskInfo(capacity=block_info[0],
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allocation=block_info[1],
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physical=block_info[2])
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yield (dsk, info)
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def inspect_memory_resident(self, instance, duration=None):
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domain = self._get_domain_not_shut_off_or_raise(instance)
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memory = domain.memoryStats()['rss'] / units.Ki
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return virt_inspector.MemoryResidentStats(resident=memory)
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