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virt-manager/virtManager/connection.py
Cole Robinson 77423e7a8d connection: catch more errors in filter_nodedevs (bug 1225771) 
https://bugzilla.redhat.com/show_bug.cgi?id=1225771 Has an example of
libvirt failing to generate nodedev XML, so handle that too.
2015-06-09 11:41:39 -04:00

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#
# Copyright (C) 2006, 2013, 2014, 2015 Red Hat, Inc.
# Copyright (C) 2006 Daniel P. Berrange <berrange@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.
#
from gi.repository import GObject
import logging
import os
import threading
import time
import traceback
import libvirt
import virtinst
from virtinst import pollhelpers
from virtinst import support
from virtinst import util
from . import connectauth
from .baseclass import vmmGObject
from .domain import vmmDomain
from .interface import vmmInterface
from .network import vmmNetwork
from .nodedev import vmmNodeDevice
from .storagepool import vmmStoragePool
# debugging helper to turn off events
_disable_libvirt_events = False
class _ObjectList(vmmGObject):
"""
Class that wraps our internal list of libvirt objects
"""
def __init__(self):
vmmGObject.__init__(self)
self._objects = []
self._lock = threading.Lock()
def _cleanup(self):
try:
self._lock.acquire()
for obj in self._objects:
try:
obj.cleanup()
except:
logging.debug("Failed to cleanup %s", exc_info=True)
self._objects = []
finally:
self._lock.release()
def remove(self, obj):
"""
Remove an object from the list.
:param obj: vmmLibvirtObject to remove
:returns: True if object removed, False if object was not found
"""
try:
self._lock.acquire()
# Identity check is sufficient here, since we should never be
# asked to remove an object that wasn't at one point in the list.
if obj not in self._objects:
return False
self._objects.remove(obj)
return True
finally:
self._lock.release()
def add(self, obj):
"""
Add an object to the list.
:param obj: vmmLibvirtObject to add
:returns: True if object added, False if object already in the list
"""
try:
self._lock.acquire()
# We don't look up based on identity here, to prevent tick()
# races from adding the same domain twice
#
# We don't use lookup_object here since we need to hold the
# lock the whole time to prevent a 'time of check' issue
for checkobj in self._objects:
if (checkobj.__class__ == obj.__class__ and
checkobj.get_connkey() == obj.get_connkey()):
return False
if obj in self._objects:
return False
self._objects.append(obj)
return True
finally:
self._lock.release()
def get_objects_for_class(self, classobj):
"""
Return all objects over the passed vmmLibvirtObject class
"""
try:
self._lock.acquire()
return [o for o in self._objects if o.__class__ is classobj]
finally:
self._lock.release()
def lookup_object(self, classobj, connkey):
"""
Lookup an object with the passed classobj + connkey
"""
# Doesn't require locking, since get_objects_for_class covers us
for obj in self.get_objects_for_class(classobj):
if obj.get_connkey() == connkey:
return obj
return None
class vmmConnection(vmmGObject):
__gsignals__ = {
"vm-added": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"vm-removed": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"net-added": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"net-removed": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"pool-added": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"pool-removed": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"interface-added": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"interface-removed": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"nodedev-added": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"nodedev-removed": (GObject.SignalFlags.RUN_FIRST, None, [str]),
"resources-sampled": (GObject.SignalFlags.RUN_FIRST, None, []),
"state-changed": (GObject.SignalFlags.RUN_FIRST, None, []),
"connect-error": (GObject.SignalFlags.RUN_FIRST, None,
[str, str, bool]),
"priority-tick": (GObject.SignalFlags.RUN_FIRST, None, [object]),
}
(_STATE_DISCONNECTED,
_STATE_CONNECTING,
_STATE_ACTIVE) = range(1, 4)
def __init__(self, uri):
vmmGObject.__init__(self)
self._uri = uri
if self._uri is None or self._uri.lower() == "xen":
self._uri = "xen:///"
self._state = self._STATE_DISCONNECTED
self._backend = virtinst.VirtualConnection(self._uri)
self._closing = False
self._init_object_count = None
self._init_object_event = None
self._network_capable = None
self._storage_capable = None
self._interface_capable = None
self._nodedev_capable = None
self.using_domain_events = False
self._domain_cb_ids = []
self.using_network_events = False
self._network_cb_ids = []
self._xml_flags = {}
self._objects = _ObjectList()
self._stats = []
self._hostinfo = None
self.add_gsettings_handle(
self._on_config_pretty_name_changed(
self._config_pretty_name_changed_cb))
self._init_virtconn()
@staticmethod
def pretty_hv(gtype, domtype):
"""
Convert XML <domain type='foo'> and <os><type>bar</type>
into a more human relevant string.
"""
gtype = gtype.lower()
domtype = domtype.lower()
label = domtype
if domtype == "xen":
if gtype == "xen":
label = "xen (paravirt)"
elif gtype == "hvm":
label = "xen (fullvirt)"
elif domtype == "test":
if gtype == "xen":
label = "test (xen)"
elif gtype == "hvm":
label = "test (hvm)"
return label
#################
# Init routines #
#################
def _init_virtconn(self):
self._backend.cb_fetch_all_guests = (
lambda: [obj.get_xmlobj(refresh_if_nec=False)
for obj in self.list_vms()])
self._backend.cb_fetch_all_pools = (
lambda: [obj.get_xmlobj(refresh_if_nec=False)
for obj in self.list_pools()])
self._backend.cb_fetch_all_nodedevs = (
lambda: [obj.get_xmlobj(refresh_if_nec=False)
for obj in self.list_nodedevs()])
def fetch_all_vols():
ret = []
for pool in self.list_pools():
for vol in pool.get_volumes():
try:
ret.append(vol.get_xmlobj(refresh_if_nec=False))
except Exception, e:
logging.debug("Fetching volume XML failed: %s", e)
return ret
self._backend.cb_fetch_all_vols = fetch_all_vols
def clear_cache(pools=False):
if not pools:
return
# This isn't synchronous, so any virtinst callers need to
# take that into account.
self.schedule_priority_tick(pollpool=True)
self._backend.cb_clear_cache = clear_cache
########################
# General data getters #
########################
def get_uri(self):
return self._uri
def get_backend(self):
return self._backend
def invalidate_caps(self):
return self._backend.invalidate_caps()
caps = property(lambda self: getattr(self, "_backend").caps)
def host_memory_size(self):
if not self._backend.is_open():
return 0
return self._hostinfo[1] * 1024
def host_active_processor_count(self):
if not self._backend.is_open():
return 0
return self._hostinfo[2]
def connect(self, name, callback, *args):
handle_id = vmmGObject.connect(self, name, callback, *args)
if name == "vm-added":
for vm in self.list_vms():
self.emit("vm-added", vm.get_connkey())
return handle_id
##########################
# URI + hostname helpers #
##########################
def libvirt_gethostname(self):
return self._backend.getHostname()
get_uri_hostname = property(lambda s:
getattr(s, "_backend").get_uri_hostname)
get_uri_username = property(lambda s:
getattr(s, "_backend").get_uri_username)
get_uri_transport = property(lambda s:
getattr(s, "_backend").get_uri_transport)
get_uri_port = property(lambda s: getattr(s, "_backend").get_uri_port)
get_driver = property(lambda s: getattr(s, "_backend").get_uri_driver)
is_container = property(lambda s: getattr(s, "_backend").is_container)
is_lxc = property(lambda s: getattr(s, "_backend").is_lxc)
is_openvz = property(lambda s: getattr(s, "_backend").is_openvz)
is_xen = property(lambda s: getattr(s, "_backend").is_xen)
is_remote = property(lambda s: getattr(s, "_backend").is_remote)
is_qemu = property(lambda s: getattr(s, "_backend").is_qemu)
is_qemu_system = property(lambda s: getattr(s, "_backend").is_qemu_system)
is_qemu_session = property(lambda s:
getattr(s, "_backend").is_qemu_session)
is_test_conn = property(lambda s: getattr(s, "_backend").is_test)
is_session_uri = property(lambda s: getattr(s, "_backend").is_session_uri)
# Connection capabilities debug helpers
def stable_defaults(self, *args, **kwargs):
return self._backend.stable_defaults(*args, **kwargs)
def get_cache_dir(self):
uri = self.get_uri().replace("/", "_")
ret = os.path.join(util.get_cache_dir(), uri)
if not os.path.exists(ret):
os.makedirs(ret, 0755)
return ret
def get_default_storage_format(self):
raw = self.config.get_default_storage_format(raw=True)
if raw != "default":
return raw
fmt = self.config.get_default_storage_format()
if fmt != "qcow2":
return fmt
if self.check_support(self._backend.SUPPORT_CONN_DEFAULT_QCOW2):
return fmt
return None
####################################
# Connection pretty print routines #
####################################
def get_pretty_desc(self):
"""
Return a pretty label for use in the manager view, and various
connection lists.
"""
if self._get_config_pretty_name():
return self._get_config_pretty_name()
if self._backend.fake_name():
return self._backend.fake_name()
pretty_map = {
"esx" : "ESX",
"gsx" : "GSX",
"libxl" : "libxl",
"lxc" : "LXC",
"openvz" : "OpenVZ",
"phyp" : "phyp",
"qemu" : "QEMU/KVM",
"test" : "test",
"uml" : "UML",
"vbox" : "VBox",
"vmware" : "VMWare",
"xen" : "xen",
"xenapi" : "XenAPI",
}
hv = pretty_map.get(self.get_driver(), self.get_driver())
hostname = self.get_uri_hostname()
path = self.get_backend().get_uri_path()
is_session = self.get_backend().is_session_uri()
ret = hv
if is_session:
ret += " User session"
elif path != "/system":
# Used by test URIs to report what XML file they are using
ret += " %s" % os.path.basename(path)
if hostname:
ret += ": %s" % hostname
return ret
#######################
# API support helpers #
#######################
for _supportname in [_supportname for _supportname in
dir(virtinst.VirtualConnection) if
_supportname.startswith("SUPPORT_")]:
locals()[_supportname] = getattr(virtinst.VirtualConnection,
_supportname)
def check_support(self, *args):
return self._backend.check_support(*args)
def is_storage_capable(self):
if self._storage_capable is None:
self._storage_capable = self.check_support(
self._backend.SUPPORT_CONN_STORAGE)
if self._storage_capable is False:
logging.debug("Connection doesn't seem to support storage "
"APIs. Skipping all storage polling.")
else:
# Try to create the default storage pool
try:
virtinst.StoragePool.build_default_pool(self.get_backend())
except Exception, e:
logging.debug("Building default pool failed: %s", str(e))
return self._storage_capable
def is_network_capable(self):
if self._network_capable is None:
self._network_capable = self.check_support(
self._backend.SUPPORT_CONN_NETWORK)
if self._network_capable is False:
logging.debug("Connection doesn't seem to support network "
"APIs. Skipping all network polling.")
return self._network_capable
def is_interface_capable(self):
if self._interface_capable is None:
self._interface_capable = self.check_support(
self._backend.SUPPORT_CONN_INTERFACE)
if self._interface_capable is False:
logging.debug("Connection doesn't seem to support interface "
"APIs. Skipping all interface polling.")
return self._interface_capable
def is_nodedev_capable(self):
if self._nodedev_capable is None:
self._nodedev_capable = self.check_support(
self._backend.SUPPORT_CONN_NODEDEV)
return self._nodedev_capable
def _get_flags_helper(self, obj, key, check_func):
ignore = obj
flags_dict = self._xml_flags.get(key)
if flags_dict is None:
# Flags already set
inact, act = check_func()
flags_dict = {}
flags_dict["active"] = act
flags_dict["inactive"] = inact
self._xml_flags[key] = flags_dict
active_flags = flags_dict["active"]
inactive_flags = flags_dict["inactive"]
return (inactive_flags, active_flags)
def get_dom_flags(self, vm):
key = "domain"
def check_func():
act = 0
inact = 0
if self.check_support(
self._backend.SUPPORT_DOMAIN_XML_INACTIVE, vm):
inact = libvirt.VIR_DOMAIN_XML_INACTIVE
else:
logging.debug("Domain XML inactive flag not supported.")
if self.check_support(
self._backend.SUPPORT_DOMAIN_XML_SECURE, vm):
inact |= libvirt.VIR_DOMAIN_XML_SECURE
act = libvirt.VIR_DOMAIN_XML_SECURE
else:
logging.debug("Domain XML secure flag not supported.")
return inact, act
return self._get_flags_helper(vm, key, check_func)
def get_interface_flags(self, iface):
key = "interface"
def check_func():
act = 0
inact = 0
if self.check_support(
self._backend.SUPPORT_INTERFACE_XML_INACTIVE, iface):
inact = libvirt.VIR_INTERFACE_XML_INACTIVE
else:
logging.debug("Interface XML inactive flag not supported.")
return (inact, act)
return self._get_flags_helper(iface, key, check_func)
def get_default_pool(self):
for p in self.list_pools():
if p.get_name() == "default":
return p
return None
def get_vol_by_path(self, path):
for pool in self.list_pools():
for vol in pool.get_volumes():
try:
if vol.get_target_path() == path:
return vol
except Exception, e:
# Errors can happen if the volume disappeared, bug 1092739
logging.debug("Error looking up volume from path=%s: %s",
path, e)
return None
###################################
# Connection state getter/setters #
###################################
def _change_state(self, newstate):
if self._state != newstate:
self._state = newstate
logging.debug("conn=%s changed to state=%s",
self.get_uri(), self.get_state_text())
self.emit("state-changed")
def is_active(self):
return self._state == self._STATE_ACTIVE
def is_disconnected(self):
return self._state == self._STATE_DISCONNECTED
def is_connecting(self):
return self._state == self._STATE_CONNECTING
def get_state_text(self):
if self.is_disconnected():
return _("Disconnected")
elif self.is_connecting():
return _("Connecting")
elif self.is_active():
return _("Active")
else:
return _("Unknown")
#################################
# Libvirt object lookup methods #
#################################
def get_vm(self, connkey):
return self._objects.lookup_object(vmmDomain, connkey)
def list_vms(self):
return self._objects.get_objects_for_class(vmmDomain)
def get_net(self, connkey):
return self._objects.lookup_object(vmmNetwork, connkey)
def list_nets(self):
return self._objects.get_objects_for_class(vmmNetwork)
def get_pool(self, connkey):
return self._objects.lookup_object(vmmStoragePool, connkey)
def list_pools(self):
return self._objects.get_objects_for_class(vmmStoragePool)
def get_interface(self, connkey):
return self._objects.lookup_object(vmmInterface, connkey)
def list_interfaces(self):
return self._objects.get_objects_for_class(vmmInterface)
def get_nodedev(self, connkey):
return self._objects.lookup_object(vmmNodeDevice, connkey)
def list_nodedevs(self):
return self._objects.get_objects_for_class(vmmNodeDevice)
############################
# nodedev helper functions #
############################
def filter_nodedevs(self, devtype=None, devcap=None):
retdevs = []
for dev in self.list_nodedevs():
try:
xmlobj = dev.get_xmlobj()
except libvirt.libvirtError, e:
# Libvirt nodedev XML fetching can be busted
# https://bugzilla.redhat.com/show_bug.cgi?id=1225771
if e.get_error_code() != libvirt.VIR_ERR_NO_NODE_DEVICE:
logging.debug("Error fetching nodedev XML", exc_info=True)
continue
if devtype and xmlobj.device_type != devtype:
continue
if devcap:
if (not hasattr(xmlobj, "capability_type") or
xmlobj.capability_type != devcap):
continue
if (devtype == "usb_device" and
(("Linux Foundation" in str(xmlobj.vendor_name) or
("Linux" in str(xmlobj.vendor_name) and
xmlobj.vendor_id == "0x1d6b")) and
("root hub" in str(xmlobj.product_name) or
("host controller" in str(xmlobj.product_name).lower() and
str(xmlobj.product_id).startswith("0x000"))))):
continue
retdevs.append(dev)
return retdevs
def get_nodedev_count(self, devtype, vendor, product):
count = 0
devs = self.filter_nodedevs(devtype)
for dev in devs:
if (vendor == dev.xmlobj.vendor_id and
product == dev.xmlobj.product_id):
count += 1
logging.debug("There are %d node devices with "
"vendorId: %s, productId: %s",
count, vendor, product)
return count
###################################
# Libvirt object creation methods #
###################################
def define_domain(self, xml):
return self._backend.defineXML(xml)
def define_network(self, xml):
return self._backend.networkDefineXML(xml)
def define_pool(self, xml):
return self._backend.storagePoolDefineXML(xml, 0)
def define_interface(self, xml):
return self._backend.interfaceDefineXML(xml, 0)
def rename_object(self, obj, origxml, newxml, oldname, newname):
ignore = oldname
ignore = newname
if obj.class_name() == "domain":
define_cb = self.define_domain
elif obj.class_name() == "pool":
define_cb = self.define_pool
elif obj.class_name() == "network":
define_cb = self.define_network
else:
raise RuntimeError("programming error: rename_object "
"helper doesn't support object class %s" % obj.__class__)
# Undefine the original object
obj.delete(force=False)
newobj = None
try:
# Redefine new domain
newobj = define_cb(newxml)
except Exception, renameerr:
try:
logging.debug("Error defining new name %s XML",
obj.class_name(), exc_info=True)
newobj = define_cb(origxml)
except Exception, fixerr:
logging.debug("Failed to redefine original %s!",
obj.class_name(), exc_info=True)
raise RuntimeError(
_("%s rename failed. Attempting to recover also "
"failed.\n\n"
"Original error: %s\n\n"
"Recover error: %s" %
(obj.class_name(), str(renameerr), str(fixerr))))
raise
finally:
if newobj:
# Reinsert handle into new obj
obj.change_name_backend(newobj)
#########################
# Domain event handling #
#########################
# Our strategy here isn't the most efficient: since we need to keep the
# poll helpers around for compat with old libvirt, switching to a fully
# event driven setup is hard, so we end up doing more polling than
# necessary on most events.
def _domain_xml_misc_event(self, conn, domain, *args):
# Just trigger a domain XML refresh for hotplug type events
ignore = conn
name = domain.name()
logging.debug("domain xmlmisc event: domain=%s args=%s ", name, args)
obj = self.get_vm(name)
if not obj:
return
self.idle_add(obj.refresh_from_event_loop)
def _domain_lifecycle_event(self, conn, domain, event, reason, userdata):
ignore = conn
ignore = userdata
name = domain.name()
logging.debug("domain lifecycle event: domain=%s event=%s "
"reason=%s", name, event, reason)
obj = self.get_vm(name)
if obj:
self.idle_add(obj.refresh_from_event_loop)
else:
self.schedule_priority_tick(pollvm=True, force=True)
def _network_lifecycle_event(self, conn, network, event, reason, userdata):
ignore = conn
ignore = userdata
name = network.name()
logging.debug("network lifecycle event: network=%s event=%s "
"reason=%s", name, event, reason)
obj = self.get_net(name)
if obj:
self.idle_add(obj.refresh_from_event_loop)
else:
self.schedule_priority_tick(pollnet=True, force=True)
def _add_conn_events(self):
if not self.check_support(support.SUPPORT_CONN_WORKING_XEN_EVENTS):
return
try:
if _disable_libvirt_events:
raise RuntimeError("_disable_libvirt_events = True")
self._domain_cb_ids.append(
self.get_backend().domainEventRegisterAny(
None, libvirt.VIR_DOMAIN_EVENT_ID_LIFECYCLE,
self._domain_lifecycle_event, None))
self.using_domain_events = True
logging.debug("Using domain events")
except Exception, e:
self.using_domain_events = False
logging.debug("Error registering domain events: %s", e)
def _add_domain_xml_event(eventid, typestr):
if not self.using_domain_events:
return
try:
self._domain_cb_ids.append(
self.get_backend().domainEventRegisterAny(
None, eventid, self._domain_xml_misc_event, None))
except Exception, e:
logging.debug("Error registering domain %s event: %s",
typestr, e)
_add_domain_xml_event(
getattr(libvirt, "VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE", 13),
"balloon")
_add_domain_xml_event(
getattr(libvirt, "VIR_DOMAIN_EVENT_ID_TRAY_CHANGE", 10), "tray")
_add_domain_xml_event(
getattr(libvirt, "VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED", 15),
"device removed")
_add_domain_xml_event(
getattr(libvirt, "VIR_DOMAIN_EVENT_ID_DEVICE_ADDED", 19),
"device added")
try:
if _disable_libvirt_events:
raise RuntimeError("_disable_libvirt_events = True")
eventid = getattr(libvirt, "VIR_NETWORK_EVENT_ID_LIFECYCLE", 0)
self._network_cb_ids.append(
self.get_backend().networkEventRegisterAny(
None, eventid, self._network_lifecycle_event, None))
self.using_network_events = True
logging.debug("Using network events")
except Exception, e:
self.using_network_events = False
logging.debug("Error registering network events: %s", e)
######################################
# Connection closing/opening methods #
######################################
def _schedule_close(self):
self._closing = True
self.idle_add(self.close)
def close(self):
if not self.is_disconnected():
logging.debug("conn.close() uri=%s", self.get_uri())
self._closing = True
try:
if not self._backend.is_closed():
for eid in self._domain_cb_ids:
self._backend.domainEventDeregisterAny(eid)
for eid in self._network_cb_ids:
self._backend.networkEventDeregisterAny(eid)
except:
logging.debug("Failed to deregister events in conn cleanup",
exc_info=True)
finally:
self._domain_cb_ids = []
self._network_cb_ids = []
self._backend.close()
self._stats = []
if self._init_object_event:
self._init_object_event.clear()
self._objects.cleanup()
self._objects = _ObjectList()
self._change_state(self._STATE_DISCONNECTED)
self._closing = False
def _cleanup(self):
self.close()
def open(self):
if not self.is_disconnected():
return
self._change_state(self._STATE_CONNECTING)
logging.debug("Scheduling background open thread for " +
self.get_uri())
self._start_thread(self._open_thread, "Connect %s" % self.get_uri())
def _do_creds_password(self, creds):
try:
return connectauth.creds_dialog(self, creds)
except:
logging.debug("Launching creds dialog failed", exc_info=True)
return -1
def _do_open(self, retry_for_tgt=True):
warnconsole = False
libvirt_error_code = None
libvirt_error_message = None
try:
self._backend.open(self._do_creds_password)
return True, None
except Exception, exc:
tb = "".join(traceback.format_exc())
if type(exc) is libvirt.libvirtError:
libvirt_error_code = exc.get_error_code()
libvirt_error_message = exc.get_error_message()
if (libvirt_error_code ==
getattr(libvirt, "VIR_ERR_AUTH_CANCELLED", None)):
logging.debug("User cancelled auth, not raising any error.")
return False, None
if (libvirt_error_code == libvirt.VIR_ERR_AUTH_FAILED and
"not authorized" in libvirt_error_message.lower()):
logging.debug("Looks like we might have failed policykit "
"auth. Checking to see if we have a valid "
"console session")
if (not self.is_remote() and
not connectauth.do_we_have_session()):
warnconsole = True
if (libvirt_error_code == libvirt.VIR_ERR_AUTH_FAILED and
"GSSAPI Error" in libvirt_error_message and
"No credentials cache found" in libvirt_error_message):
if retry_for_tgt and connectauth.acquire_tgt():
self._do_open(retry_for_tgt=False)
connectError = (str(exc), tb, warnconsole)
return False, connectError
def _populate_initial_state(self):
logging.debug("libvirt version=%s",
self._backend.local_libvirt_version())
logging.debug("daemon version=%s",
self._backend.daemon_version())
logging.debug("conn version=%s", self._backend.conn_version())
logging.debug("%s capabilities:\n%s",
self.get_uri(), self.caps.get_xml_config())
self._add_conn_events()
# Prime CPU cache
self.caps.get_cpu_values("x86_64")
try:
self._backend.setKeepAlive(20, 1)
except Exception, e:
if (type(e) is not AttributeError and
not util.is_error_nosupport(e)):
raise
logging.debug("Connection doesn't support KeepAlive, "
"skipping")
# The initial tick will set up a threading event that will only
# trigger after all the polled libvirt objects are fully initialized.
# That way we only report the connection is open when everything is
# nicely setup for the rest of the app.
self._init_object_event = threading.Event()
self._init_object_count = 0
self.schedule_priority_tick(stats_update=True,
pollvm=True, pollnet=True,
pollpool=True, polliface=True,
pollnodedev=True, force=True, initial_poll=True)
self._init_object_event.wait()
self._init_object_event = None
self._init_object_count = None
def _open_thread(self):
try:
is_active, connectError = self._do_open()
if is_active:
self._populate_initial_state()
self.idle_add(self._change_state, is_active and
self._STATE_ACTIVE or self._STATE_DISCONNECTED)
except Exception, e:
is_active = False
self._schedule_close()
connectError = (str(e), "".join(traceback.format_exc()), False)
if not is_active:
if connectError:
self.idle_emit("connect-error", *connectError)
#######################
# Tick/Update methods #
#######################
def _gone_object_signals(self, gone_objects):
"""
Responsible for signaling the UI for any updates. All possible UI
updates need to go here to enable threading that doesn't block the
app with long tick operations.
"""
if not self._backend.is_open():
return
for obj in gone_objects:
class_name = obj.class_name()
try:
name = obj.get_name()
except:
name = str(obj)
if not self._objects.remove(obj):
logging.debug("Requested removal of %s=%s, but it's "
"not in our object list.", class_name, name)
continue
logging.debug("%s=%s removed", class_name, name)
if class_name == "domain":
self.emit("vm-removed", obj.get_connkey())
elif class_name == "network":
self.emit("net-removed", obj.get_connkey())
elif class_name == "pool":
self.emit("pool-removed", obj.get_connkey())
elif class_name == "interface":
self.emit("interface-removed", obj.get_connkey())
elif class_name == "nodedev":
self.emit("nodedev-removed", obj.get_connkey())
obj.cleanup()
def _new_object_cb(self, obj):
if not self._backend.is_open():
return
try:
class_name = obj.class_name()
if not self._objects.add(obj):
logging.debug("New %s=%s requested, but it's already tracked.",
class_name, obj.get_name())
return
if class_name != "nodedev":
# Skip nodedev logging since it's noisy and not interesting
logging.debug("%s=%s status=%s added", class_name,
obj.get_name(), obj.run_status())
if class_name == "domain":
self.emit("vm-added", obj.get_connkey())
elif class_name == "network":
self.emit("net-added", obj.get_connkey())
elif class_name == "pool":
self.emit("pool-added", obj.get_connkey())
elif class_name == "interface":
self.emit("interface-added", obj.get_connkey())
elif class_name == "nodedev":
self.emit("nodedev-added", obj.get_connkey())
finally:
if self._init_object_event:
self._init_object_count -= 1
if self._init_object_count <= 0:
self._init_object_event.set()
def _update_nets(self, dopoll):
keymap = dict((o.get_connkey(), o) for o in self.list_nets())
if not dopoll or not self.is_network_capable():
return [], [], keymap.values()
return pollhelpers.fetch_nets(self._backend, keymap,
(lambda obj, key: vmmNetwork(self, obj, key)))
def _update_pools(self, dopoll):
keymap = dict((o.get_connkey(), o) for o in self.list_pools())
if not dopoll or not self.is_storage_capable():
return [], [], keymap.values()
return pollhelpers.fetch_pools(self._backend, keymap,
(lambda obj, key: vmmStoragePool(self, obj, key)))
def _update_interfaces(self, dopoll):
keymap = dict((o.get_connkey(), o) for o in self.list_interfaces())
if not dopoll or not self.is_interface_capable():
return [], [], keymap.values()
return pollhelpers.fetch_interfaces(self._backend, keymap,
(lambda obj, key: vmmInterface(self, obj, key)))
def _update_nodedevs(self, dopoll):
keymap = dict((o.get_connkey(), o) for o in self.list_nodedevs())
if not dopoll or not self.is_nodedev_capable():
return [], [], keymap.values()
return pollhelpers.fetch_nodedevs(self._backend, keymap,
(lambda obj, key: vmmNodeDevice(self, obj, key)))
def _update_vms(self, dopoll):
keymap = dict((o.get_connkey(), o) for o in self.list_vms())
if not dopoll:
return [], [], keymap.values()
return pollhelpers.fetch_vms(self._backend, keymap,
(lambda obj, key: vmmDomain(self, obj, key)))
def _poll(self, initial_poll,
pollvm, pollnet, pollpool, polliface, pollnodedev):
"""
Helper called from tick() to do necessary polling and return
the relevant object lists
"""
gone_objects = []
preexisting_objects = []
def _process_objects(polloutput):
gone, new, master = polloutput
if initial_poll:
self._init_object_count += len(new)
gone_objects.extend(gone)
preexisting_objects.extend([o for o in master if o not in new])
return new
new_vms = _process_objects(self._update_vms(pollvm))
new_nets = _process_objects(self._update_nets(pollnet))
new_pools = _process_objects(self._update_pools(pollpool))
new_ifaces = _process_objects(self._update_interfaces(polliface))
new_nodedevs = _process_objects(self._update_nodedevs(pollnodedev))
# Kick off one thread per object type to handle the initial
# XML fetching. Going any more fine grained then this probably
# won't be that useful due to libvirt's locking structure.
#
# Would prefer to start refreshing some objects before all polling
# is complete, but we need init_object_count to be fully accurate
# before we start initializing objects
for newlist in [new_vms, new_nets, new_pools,
new_ifaces, new_nodedevs]:
if not newlist:
continue
def cb(lst):
for obj in lst:
obj.connect_once("initialized", self._new_object_cb)
obj.init_libvirt_state()
self._start_thread(cb,
"refreshing xml for new %s" % newlist[0].class_name(),
args=(newlist,))
return gone_objects, preexisting_objects
def _tick(self, stats_update=False,
pollvm=False, pollnet=False,
pollpool=False, polliface=False,
pollnodedev=False,
force=False, initial_poll=False):
"""
main update function: polls for new objects, updates stats, ...
:param force: Perform the requested polling even if async events
are in use.
"""
if self._closing:
return
if self.is_disconnected():
return
if self.is_connecting() and not force:
return
# We need to set this before the event check, since stats polling
# is independent of events
if not pollvm:
stats_update = False
if self.using_domain_events and not force:
pollvm = False
if self.using_network_events and not force:
pollnet = False
self._hostinfo = self._backend.getInfo()
gone_objects, preexisting_objects = self._poll(
initial_poll, pollvm, pollnet, pollpool, polliface, pollnodedev)
self.idle_add(self._gone_object_signals, gone_objects)
# Only tick() pre-existing objects, since new objects will be
# initialized asynchronously and tick() would be redundant
for obj in preexisting_objects:
try:
if obj.reports_stats() and stats_update:
pass
elif obj.__class__ is vmmDomain and not pollvm:
continue
elif obj.__class__ is vmmNetwork and not pollnet:
continue
elif obj.__class__ is vmmStoragePool and not pollpool:
continue
elif obj.__class__ is vmmInterface and not polliface:
continue
elif obj.__class__ is vmmNodeDevice and not pollnodedev:
continue
obj.tick(stats_update=stats_update)
except Exception, e:
logging.exception("Tick for %s failed", obj)
if (isinstance(e, libvirt.libvirtError) and
(getattr(e, "get_error_code")() ==
libvirt.VIR_ERR_SYSTEM_ERROR)):
# Try a simple getInfo call to see if conn was dropped
self._backend.getInfo()
logging.debug("vm tick raised system error but "
"connection doesn't seem to have dropped. "
"Ignoring.")
if stats_update:
self._recalculate_stats(
[o for o in preexisting_objects if o.reports_stats()])
self.idle_emit("resources-sampled")
def _recalculate_stats(self, vms):
if not self._backend.is_open():
return
now = time.time()
expected = self.config.get_stats_history_length()
current = len(self._stats)
if current > expected:
del self._stats[expected:current]
mem = 0
cpuTime = 0
rdRate = 0
wrRate = 0
rxRate = 0
txRate = 0
diskMaxRate = self.disk_io_max_rate() or 10.0
netMaxRate = self.network_traffic_max_rate() or 10.0
for vm in vms:
if not vm.is_active():
continue
cpuTime += vm.cpu_time()
mem += vm.stats_memory()
rdRate += vm.disk_read_rate()
wrRate += vm.disk_write_rate()
rxRate += vm.network_rx_rate()
txRate += vm.network_tx_rate()
netMaxRate = max(netMaxRate, vm.network_traffic_max_rate())
diskMaxRate = max(diskMaxRate, vm.disk_io_max_rate())
pcentHostCpu = 0
pcentMem = mem * 100.0 / self.host_memory_size()
if len(self._stats) > 0:
prevTimestamp = self._stats[0]["timestamp"]
host_cpus = self.host_active_processor_count()
pcentHostCpu = ((cpuTime) * 100.0 /
((now - prevTimestamp) *
1000.0 * 1000.0 * 1000.0 * host_cpus))
pcentHostCpu = max(0.0, min(100.0, pcentHostCpu))
pcentMem = max(0.0, min(100.0, pcentMem))
newStats = {
"timestamp": now,
"memory": mem,
"memoryPercent": pcentMem,
"cpuTime": cpuTime,
"cpuHostPercent": pcentHostCpu,
"diskRdRate" : rdRate,
"diskWrRate" : wrRate,
"netRxRate" : rxRate,
"netTxRate" : txRate,
"diskMaxRate" : diskMaxRate,
"netMaxRate" : netMaxRate,
}
self._stats.insert(0, newStats)
def schedule_priority_tick(self, **kwargs):
self.idle_emit("priority-tick", kwargs)
def tick_from_engine(self, *args, **kwargs):
e = None
try:
self._tick(*args, **kwargs)
except KeyboardInterrupt:
raise
except Exception, e:
pass
if e is None:
return
from_remote = getattr(libvirt, "VIR_FROM_REMOTE", None)
from_rpc = getattr(libvirt, "VIR_FROM_RPC", None)
sys_error = getattr(libvirt, "VIR_ERR_SYSTEM_ERROR", None)
dom = -1
code = -1
if isinstance(e, libvirt.libvirtError):
dom = e.get_error_domain()
code = e.get_error_code()
logging.debug("Error polling connection %s",
self.get_uri(), exc_info=True)
if (dom in [from_remote, from_rpc] and
code in [sys_error]):
e = None
logging.debug("Not showing user error since libvirtd "
"appears to have stopped.")
self._schedule_close()
if e:
raise e # pylint: disable=raising-bad-type
########################
# Stats getter methods #
########################
def _get_record_helper(self, record_name):
if len(self._stats) == 0:
return 0
return self._stats[0][record_name]
def _vector_helper(self, record_name, limit, ceil=100.0):
vector = []
statslen = self.config.get_stats_history_length() + 1
if limit is not None:
statslen = min(statslen, limit)
for i in range(statslen):
if i < len(self._stats):
vector.append(self._stats[i][record_name] / ceil)
else:
vector.append(0)
return vector
def stats_memory_vector(self, limit=None):
return self._vector_helper("memoryPercent", limit)
def host_cpu_time_vector(self, limit=None):
return self._vector_helper("cpuHostPercent", limit)
def stats_memory(self):
return self._get_record_helper("memory")
def host_cpu_time_percentage(self):
return self._get_record_helper("cpuHostPercent")
def guest_cpu_time_percentage(self):
return self.host_cpu_time_percentage()
def network_traffic_rate(self):
return (self._get_record_helper("netRxRate") +
self._get_record_helper("netTxRate"))
def disk_io_rate(self):
return (self._get_record_helper("diskRdRate") +
self._get_record_helper("diskWrRate"))
def network_traffic_max_rate(self):
return self._get_record_helper("netMaxRate")
def disk_io_max_rate(self):
return self._get_record_helper("diskMaxRate")
###########################
# Per-conn config helpers #
###########################
def get_autoconnect(self):
return self.config.get_conn_autoconnect(self.get_uri())
def set_autoconnect(self, val):
self.config.set_conn_autoconnect(self.get_uri(), val)
def set_config_pretty_name(self, value):
if value != self._get_config_pretty_name():
self.config.set_perconn(self.get_uri(), "/pretty-name", value)
def _get_config_pretty_name(self):
return self.config.get_perconn(self.get_uri(), "/pretty-name")
def _on_config_pretty_name_changed(self, *args, **kwargs):
return self.config.listen_perconn(self.get_uri(), "/pretty-name",
*args, **kwargs)
def _config_pretty_name_changed_cb(self):
self.emit("state-changed")
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