Newer
Older
from cloudcontrol.node.host import Handler as HostHandler
from cloudcontrol.node.tags import Tag, tag_inspector, get_tags
from cloudcontrol.node.hypervisor import tags
from cloudcontrol.node.hypervisor.lib import (
DOMAIN_STATES, EVENTS, STORAGE_STATES,
EventLoop as VirEventLoop,
)
from cloudcontrol.node.hypervisor.domains import VirtualMachine
from cloudcontrol.node.exc import (
UndefinedDomain, PoolStorageError, DRBDError, VMMigrationError,
)
from cloudcontrol.node.hypervisor.jobs import (
ImportVolume, ExportVolume, TCPTunnel, DRBD,
)
logger = logging.getLogger(__name__)
# FIXME find a way to refactor Handler and Hypervisor class
class Handler(HostHandler):
def __init__(self, *args, **kwargs):
"""
self.hypervisor_name = kwargs.pop('hypervisor_name')
HostHandler.__init__(self, *args, **kwargs)
#: keep index of asynchronous calls
self.async_calls = dict()
self.timer = self.main.evloop.timer(.0, 5., self.virt_connect_cb)
self.hypervisor = None
self._virt_connected = False
# register tags
self.tag_db.add_tags(tag_inspector(tags, self))
@property
def virt_connected(self):
return self._virt_connected
@virt_connected.setter
def virt_connected(self, value):
self._virt_connected = value
# update tags
for tag in ('vir_status', 'sto', 'nvm', 'vmpaused', 'vmstarted',
'vmstopped', 'hvver', 'libvirtver', 'hv'):
self.tag_db['__main__'][tag].update_value()
def start(self):
self.timer.start()
HostHandler.start(self)
def stop(self):
self.timer.stop()
if self.hypervisor is not None:
self.hypervisor.stop()
HostHandler.stop(self)
def virt_connect_cb(self, *args):
# initialize hypervisor instance
try:
self.hypervisor = Hypervisor(
name=self.hypervisor_name,
handler=self,
)
except libvirt.libvirtError:
logger.exception('Error while connecting to libvirt')
return
self.virt_connected = True
# register hypervisor storage tags
for name, storage in self.hypervisor.storage.storages.iteritems():
self.tag_db.add_tags((
Tag('sto%s_state' % name, lambda: storage.state, 5, 5),
Tag('sto%s_size' % name, lambda: storage.capacity, 5, 5),
Tag('sto%s_free' % name, lambda: storage.available, 5, 5),
lambda: storage.capacity - storage.available, 5, 5),
Tag('sto%s_type' % name, lambda: storage.type, 5, 5),
for dom in self.hypervisor.domains.itervalues():
self.tag_db.add_sub_object(dom.name, dom.tags.itervalues())
self.rpc_handler.update(dict(
vm_define=self.vm_define,
vm_undefine=self.vm_undefine,
vm_export=self.vm_export,
vm_stop=self.vm_stop,
vm_start=self.vm_start,
vm_suspend=self.vm_suspend,
vm_resume=self.vm_resume,
))
self.main.reset_handler('vm_define', self.vm_define)
self.main.reset_handler('vm_undefine', self.vm_undefine)
self.main.reset_handler('vm_export', self.vm_export)
self.main.reset_handler('vm_stop', self.vm_stop)
self.main.reset_handler('vm_destroy', self.vm_destroy)
self.main.reset_handler('vm_start', self.vm_start)
self.main.reset_handler('vm_suspend', self.vm_suspend)
self.main.reset_handler('vm_resume', self.vm_resume)
self.main.reset_handler('vm_migrate_tunneled', self.vm_migrate_tunneled)
self.main.reset_handler('vol_create', self.vol_create)
self.main.reset_handler('vol_delete', self.vol_delete)
self.main.reset_handler('vol_import', self.vol_import)
self.main.reset_handler('vol_import_wait', self.vol_import_wait)
self.main.reset_handler('vol_export', self.vol_export)
self.main.reset_handler('tun_setup', self.tun_setup)
self.main.reset_handler('tun_connect', self.tun_connect)
self.main.reset_handler('tun_connect_hv', self.tun_connect_hv)
self.main.reset_handler('tun_destroy', self.tun_destroy)
self.main.reset_handler('drbd_setup', self.drbd_setup)
self.main.reset_handler('drbd_connect', self.drbd_connect)
self.main.reset_handler('drbd_role', self.drbd_role)
self.main.reset_handler('drbd_takeover', self.drbd_takeover)
self.main.reset_handler('drbd_sync_status', self.drbd_sync_status)
self.main.reset_handler('drbd_shutdown', self.drbd_shutdown)
self.main.reset_handler('vm_open_console', self.vm_open_console)
# if everything went fine, unregister the timer
self.timer.stop()
def virt_connect_restart(self):
"""Restart libvirt connection.
This method might be called when libvirt connection is lost.
"""
if not self.virt_connected:
return
logger.error('Connection to libvirt lost, trying to restart')
# update connection state
self.virt_connected = False
# unregister tags that will be re registered later
for storage in self.hypervisor.storage.storages:
self.tag_db.remove_tags((
'sto%s_state' % storage,
'sto%s_size' % storage,
'sto%s_free' % storage,
'sto%s_used' % storage,
# unregister sub objects (for the same reason)
for sub_id in self.tag_db.keys():
if sub_id == '__main__':
continue
self.tag_db.remove_sub_object(sub_id)
# stop and delete hypervisor instance
self.hypervisor.stop()
self.hypervisor = None
# remove handlers related to libvirt
self.main.remove_handler('vm_define')
self.main.remove_handler('vm_undefine')
self.main.remove_handler('vm_export')
self.main.remove_handler('vm_stop')
self.main.remove_handler('vm_start')
self.main.remove_handler('vm_suspend')
self.main.remove_handler('vm_resume')
self.main.remove_handler('vm_migrate_tunneled')
self.main.remove_handler('vol_create')
self.main.remove_handler('vol_delete')
self.main.remove_handler('vol_import')
self.main.remove_handler('vol_import_wait')
self.main.remove_handler('vol_export')
self.main.remove_handler('tun_setup')
self.main.remove_handler('tun_connect')
self.main.remove_handler('tun_connect_hv')
self.main.remove_handler('tun_destroy')
self.main.remove_handler('drbd_setup')
self.main.remove_handler('drbd_connect')
self.main.remove_handler('drbd_role')
self.main.remove_handler('drbd_takeover')
self.main.remove_handler('drbd_sync_status')
self.main.remove_handler('drbd_shutdown')
# launch connection timer
self.timer.start()
def iter_vms(self, vm_names):
"""Utility function to iterate over VM objects using their names."""
if vm_names is None:
return
get_domain = self.hypervisor.domains.get
for name in vm_names:
dom = get_domain(name)
if dom is not None:
yield dom
def vm_define(self, data, format='xml'):
logger.debug('VM define')
if format != 'xml':
raise NotImplementedError('Format not supported')
return self.hypervisor.vm_define(data)
def vm_undefine(self, name):
vm = self.hypervisor.domains.get(name)
if vm is not None:
vm.undefine()
def vm_export(self, name, format='xml'):
if format != 'xml':
raise NotImplementedError('Format not supported')
vm = self.hypervisor.domains.get(name)
if vm is None:
return
return vm.lv_dom.XMLDesc(0)
def vm_stop(self, name):
logger.debug('VM stop %s', name)
try:
self.hypervisor.domains[name].stop()
except libvirt.libvirtError:
logger.exception('Error while stopping VM %s', name)
raise
except KeyError:
msg = 'Cannot stop VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_destroy(self, name):
logger.debug('VM destroy %s', name)
try:
self.hypervisor.domains[name].destroy()
except libvirt.libvirtError as exc:
# Libvirt raises exception 'domain is not running' event is domain
# is running, might be a bug in libvirt
if 'domain is not running' not in str(exc) or (
self.hypervisor.domains[name].state != 'running'):
logger.exception('Error while destroying VM %s', name)
raise
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
except KeyError:
msg = 'Cannot destroy VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_start(self, name):
logger.debug('VM start %s', name)
try:
self.hypervisor.domains[name].start()
except libvirt.libvirtError:
logger.exception('Error while starting VM %s', name)
raise
except KeyError:
msg = 'Cannot start VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_suspend(self, name):
logger.debug('VM suspend %s', name)
try:
self.hypervisor.domains[name].suspend()
except libvirt.libvirtError:
logger.exception('Error while suspending VM %s', name)
raise
except KeyError:
msg = 'Cannot suspend VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_resume(self, name):
logger.debug('VM resume %s', name)
try:
self.hypervisor.domains[name].resume()
except libvirt.libvirtError:
logger.exception('Error while resuming VM %s', name)
raise
except KeyError:
msg = 'Cannot resume VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_migrate_tunneled(self, name, tun_res, migtun_res, unsafe=False,
timeout=60.):
"""Live migrate VM through TCP tunnel.
:param name: VM name to migrate
:param tun_res: result of tunnel_setup handler
:param migtun_res: result of tunnel setup handler
:param unsafe: for Libvirt >= 0.9.11, see
http://libvirt.org/html/libvirt-libvirt.html#virDomainMigrateFlags
:param float timeout: timeout for libvirt migration (prevents libvirt
from trying to acquire domain lock forever)
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
"""
logger.debug('VM live migrate %s', name)
try:
remote_virt_port = tun_res['port']
except KeyError:
logger.error('Invalid formatted argument tun_res for live'
' migration')
raise
try:
remote_hv_port = migtun_res['port']
except KeyError:
logger.error('Invalid formatted argument migtun_res for live'
' migration')
raise
try:
vm = self.hypervisor.domains[name]
except KeyError:
logger.exception('Cannot find domain %s on hypervisor for live'
' migration', name)
raise
try:
dest_virt_con = libvirt.open(
'qemu+tcp://127.0.0.1:%d/system' % remote_virt_port)
except libvirt.libvirtError:
logger.exception('Cannot connect to remote libvirt for live'
' migrating vm %s', name)
raise
# we open a new connection to libvirt and fork because sometimes libvirt
# python binding, while doing a operation,
# doesn't seem to realease CPython's GIL, therefore all node
# operations are blocked
# the only solution we have found right now is to use a dedicated
# libvirt connection for the migration and fork, the migration operation
# in itself is handled by the child while other threads can be scheduled
# create a new libvirt connection dedicated to migration
new_con = libvirt.open('qemu:///system')
domain = new_con.lookupByUUIDString(vm.uuid)
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
try:
pid = os.fork()
except OSError:
logger.error('Cannot fork before running live migration')
raise
if pid == 0:
# child
# FIXME we should close all unused fds
try:
if unsafe:
# VIR_MIGRATE_UNSAFE is not defined for libvirt < 0.9.11
append_flags = getattr(libvirt, 'VIR_MIGRATE_UNSAFE', 0)
else:
append_flags = 0
domain.migrate(
dest_virt_con,
libvirt.VIR_MIGRATE_LIVE | libvirt.VIR_MIGRATE_PEER2PEER |
libvirt.VIR_MIGRATE_TUNNELLED |
libvirt.VIR_MIGRATE_PERSIST_DEST |
libvirt.VIR_MIGRATE_UNDEFINE_SOURCE |
append_flags,
None,
'qemu+tcp://127.0.0.1:%d/system' % remote_hv_port,
0,
)
except libvirt.libvirtError:
os._exit(1)
except:
# whatever the matter is we MUST NOT return to libev or sjRPC
os._exit(2)
else:
os._exit(0)
finally:
dest_virt_con.close()
else:
# watch for migration status every second
started_migration = time.time()
while True:
# wait timeout
time.sleep(1.)
# waitpid with no delay
try:
rpid, status = os.waitpid(pid, os.WNOHANG)
except OSError as exc:
logger.error('Error while waiting for child to terminate: %s',
os.strerror(exc.errno))
raise
# convert status to return status
status >>= 8
if rpid == status == 0:
if time.time() - started_migration < timeout:
continue
# waitpid returned immediately, thus migration still running
# after timeout fired, we need to kill the child (term would
# have no effect)
os.kill(pid, signal.SIGKILL)
try:
rpid, status = os.waitpid(pid, 0)
except OSError as exc:
logger.error('Error while waiting for child after killing'
' it: %s', os.strerror(exc.errno))
raise
assert rpid == pid, 'PID returned by waitpid is not valid'
logger.error('Migration timeout for vm %s', name)
raise VMMigrationError('Timeout')
else:
if status != 0:
# error
logger.error('Libvirt error while live migrating vm %s',
name)
logger.debug('Exit status %s', status)
raise VMMigrationError('Migration failed')
else:
logger.info('Sucessfuly live migrated vm %s', name)
break
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
@threadless
@pass_connection
def vm_open_console(self, conn, name):
"""
:param conn: sjRPC connection instance
:param name: VM name
"""
vm = self.hypervisor.domains[name]
# create connection to the VM console
try:
endpoint = vm.open_console()
except socket.error:
# cannot create socketpair
logger.error('Cannot create connection to VM console')
raise
def on_close(tun):
"""Method of Tunnel protocol close callback."""
tun.endpoint.close()
vm.close_console()
# connect as tunnel endpoint
proto = conn.create_tunnel(endpoint=endpoint, on_close=on_close)
return proto.label
def vol_create(self, pool, name, size):
logger.debug('Volume create %s, pool %s, size %s', name, pool, size)
try:
self.hypervisor.storage.create_volume(pool, name, size)
except Exception:
logger.exception('Error while creating volume')
raise
def vol_delete(self, pool, name):
logger.debug('Volume delete %s, pool %s', name, pool)
try:
self.hypervisor.storage.delete_volume(pool, name)
except Exception:
logger.exception('Error while deleting volume')
raise
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
def vol_import(self, pool, name):
"""
:param pool: pool name where the volume is
:param name: name of the volume
"""
logger.debug('Volume import pool = %s, volume = %s', pool, name)
try:
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise Exception('Pool storage does not exist') # TODO exc
volume = pool.volumes.get(name)
if volume is None:
raise Exception('Volume does not exist')
# create the job
job = self.main.job_manager.create(ImportVolume, volume)
job.start()
except Exception:
logger.exception('Error while starting import job')
raise
return dict(id=job.id, port=job.port)
def vol_import_wait(self, job_id):
"""Block until completion of the given job id."""
job = self.main.job_manager.get(job_id)
logger.debug('Waiting for import job to terminate')
logger.debug('Import job terminated')
return dict(id=job.id, log='', checksum=job.checksum)
def vol_import_cancel(self, job_id):
"""Cancel import job."""
logger.debug('Cancel import job')
self.main.job_manager.cancel(job_id)
# wait for job to end
job.join() # we don't call wait as it is already called in
# vol_import_wait handler
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
def vol_export(self, pool, name, raddr, rport):
"""
:param pool: pool name where the volume is
:param name: name of the volume
:param raddr: IP address of the destination to send the volume to
:param rport: TCP port of the destination
"""
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise Exception('Pool storage does not exist')
volume = pool.volumes.get(name)
if volume is None:
raise Exception('Volume does not exist')
try:
job = self.main.job_manager.create(ExportVolume, volume, raddr, rport)
# we don't run the job in a background thread thus exceptions are
# sent to the sjRPC
job.start_current()
# otherwise we would do
# job.start()
# job.join()
except Exception:
logger.exception('Error while exporting volume')
raise
logger.debug('Export volume successfull')
return dict(id=job.id, log='', checksum=job.checksum)
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
@threadless
def tun_setup(self, local=True):
"""Set up local tunnel and listen on a random port.
:param local: indicate if we should listen on localhost or all
interfaces
"""
logger.debug('Tunnel setup: local = %s', local)
# create job
job = self.main.job_manager.create(TCPTunnel, self.main.evloop)
job.setup_listen('127.0.0.1' if local else '0.0.0.0')
return dict(
jid=job.id,
key='FIXME',
port=job.port,
)
@threadless
def tun_connect(self, res, remote_res, remote_ip):
"""Connect tunnel to the other end.
:param res: previous result of `tun_setup` handler
:param remote_res: other end result of `tun_setup` handler
:param remote_ip: where to connect
"""
logger.debug('Tunnel connect %s %s', res['jid'], remote_ip)
job = self.main.job_manager.get(res['jid'])
job.setup_connect((remote_ip, remote_res['port']))
@threadless
def tun_connect_hv(self, res, migration=False):
"""Connect tunnel to local libvirt Unix socket.
:param res: previous result of `tun_setup` handler
"""
logger.debug('Tunnel connect hypervisor %s', res['jid'])
job = self.main.job_manager.get(res['jid'])
job.setup_connect('/var/run/libvirt/libvirt-sock')
@threadless
def tun_destroy(self, res):
"""Close given tunnel.
:param res: previous result as givent by `tun_setup` handler
"""
logger.debug('Tunnel destroy %s', res['jid'])
self.main.job_manager.cancel(res['jid'])
self.main.job_manager.remove(res['jid'])
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
def drbd_setup(self, pool, name):
"""Create DRBD volumes.
:param pool: storage pool
:param name: storage volume name
"""
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise DRBDError('Cannot setup DRBD: pool storage does not exist')
elif pool.type != 'logical':
raise DRBDError('Cannot setup DRBD: pool storage is not LVM')
volume = pool.volumes.get(name)
if volume is None:
raise DRBDError('Cannot setup DRBD: volume does not exist')
try:
job = self.main.job_manager.create(DRBD, self.hypervisor.storage,
pool, volume)
except Exception:
logger.exception('Error while creating DRBD job')
raise
job.setup()
logger.debug('DRBD setup successfull')
return dict(
jid=job.id,
port=job.drbd_port,
)
def drbd_connect(self, res, remote_res, remote_ip):
"""Set up DRBD in connect mode. (Wait for connection and try to connect
to the remote peer.
:param res: previous result of `drbd_setup` handler
:param remote_res: result of remote `drbd_setup` handler
:param remote_ip: IP of remote peer
"""
job = self.main.job_manager.get(res['jid'])
job.connect(remote_ip, remote_res['port'])
job.wait_connection()
def drbd_role(self, res, primary):
"""Set up DRBD role.
:param res: previous result of `drbd_setup` handler
:param bool primary: if True, set up in primary mode else secondary
"""
job = self.main.job_manager.get(res['jid'])
if primary:
job.switch_primary()
else:
job.switch_secondary()
def drbd_takeover(self, res, state):
"""Set up DRBD device as the VM disk. FIXME
:param res: previous result of `drbd_setup` handler
:param state: FIXME
"""
job = self.main.job_manager.get(res['jid'])
job.takeover()
def drbd_sync_status(self, res):
"""Return synchronization status of a current DRBD job.
:param res: previous result of `drbd_setup` handler
"""
status = self.main.job_manager.get(res['jid']).status()
result = dict(
done=status['disk'] == 'UpToDate',
completion=status['percent'],
)
logger.debug('DRBD status %s', result)
return result
def drbd_shutdown(self, res):
"""Destroy DRBD related block devices.
:param res: previous result of `drbd_setup` handler
"""
logger.debug('DRBD shutdown')
job = self.main.job_manager.get(res['jid'])
job.cleanup()
# remove job from job_manager list
self.main.job_manager.notify(job)
class Hypervisor(object):
"""Container for all hypervisor related state."""
def __init__(self, name, handler):
"""
:param str name: name of hypervisor instance
:param Handler handler: hypervisor handler
self.handler = weakref.proxy(handler)
#: hv attributes
self.name = name
self.type = u'kvm'
# register libvirt error handler
libvirt.registerErrorHandler(self.vir_error_cb, None)
self.vir_event_loop = VirEventLoop(self.handler.main.evloop)
self.vir_con = libvirt.open('qemu:///system') # currently only support KVM
self.storage = StorageIndex(handler, self.vir_con)
logger.debug('Storages: %s', self.storage.paths)
#: domains: vms, containers...
self.domains = dict()
# find defined domains
for dom_name in self.vir_con.listDefinedDomains():
dom = self.vir_con.lookupByName(dom_name)
self.domains[dom.name()] = VirtualMachine(dom, self)
for dom_id in self.vir_con.listDomainsID():
dom = self.vir_con.lookupByID(dom_id)
self.domains[dom.name()] = VirtualMachine(dom, self)
logger.debug('Domains: %s', self.domains)
self.vir_con.domainEventRegister(self.vir_cb, None) # TODO find out args
def stop(self):
self.vir_event_loop.stop()
# unregister callback
try:
self.vir_con.domainEventDeregister(self.vir_cb)
except libvirt.libvirtError:
# in case the libvirt connection is broken, it will raise the error
pass
ret = self.vir_con.close()
logger.debug('Libvirt still handling %s ref connections', ret)
def vir_error_cb(self, ctxt, err):
"""Libvirt error callback.
See http://libvirt.org/errors.html for more informations.
:param ctxt: arbitrary context data (not needed because context is
givent by self
:param err: libvirt error code
"""
logger.error('Libvirt error %s', err)
def vir_cb(self, conn, dom, event, detail, opaque):
"""Callback for libvirt event loop."""
logger.debug('Received event %s on domain %s, detail %s', event,
dom.name(), detail)
event = EVENTS[event]
if event == 'Added':
# update Storage pools in case VM has volumes that were created
self.storage.update()
Anael Beutot
committed
if dom.name() in self.domains:
# sometimes libvirt send us the same event multiple times
# this can be the result of a change in the domain configuration
# we first remove the old domain
vm = self.domains.pop(dom.name())
self.handler.tag_db.remove_sub_object(vm.name)
logger.debug('Domain %s recreated', dom.name())
vm = VirtualMachine(dom, self)
logger.info('Created domain %s', vm.name)
self.handler.tag_db.add_sub_object(vm.name, vm.tags.itervalues())
elif event == 'Removed':
logger.info('Removed domain %s', vm.name)
elif event in ('Started', 'Suspended', 'Resumed', 'Stopped', 'Saved',
'Restored'):
# sometimes libvirt sent a start event before a created event so be
# careful
if vm is not None:
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
try:
state = DOMAIN_STATES[dom.info()[0]]
except libvirt.libvirtError as exc:
# checks that domain was not previously removed
# seems to happen only in libvirt 0.8.8
if 'Domain not found' in str(exc):
self.vm_unregister(dom.name())
else:
raise
else:
logger.info('Domain change state from %s to %s', vm.state,
state)
vm.state = state
self.update_domain_count()
def vm_unregister(self, name):
"""Unregister a VM from the cc-server and remove it from the index."""
try:
vm = self.domains.pop(name)
except KeyError:
# domain already removed, see hypervisor/domains/vm_tags.py
# sometimes libvirt send us the remove event too late
# we still update storage and tag attributes
pass
else:
self.handler.tag_db.remove_sub_object(vm.name)
# update Storage pools in case VM had volumes that were deleted
self.storage.update()
self.update_domain_count()
def update_domain_count(self):
"""Update domain state count tags."""
# update domain state counts
for tag in ('nvm', 'vmpaused', 'vmstarted', 'vmstopped'):
self.handler.tag_db['__main__'][tag].update_value()
def vm_define(self, xml_desc):
"""Create a VM on the Hypervisor
:param str xml_desc: XML description in libvirt format
:return: VM name created
"""
try:
return self.vir_con.defineXML(xml_desc).name()
except libvirt.libvirtError:
logger.exception('Error while creating domain')
# reraise exception for the cc-server
raise
def _count_domain(self, filter=lambda d: True):
count = 0
for dom in self.domains.itervalues():
if filter(dom):
count += 1
return count
@property
def vm_started(self):
"""Number of VMs started."""
return self._count_domain(lambda d: d.state == 'running')
@property
def vm_stopped(self):
"""Number of VMs stopped."""
return self._count_domain(lambda d: d.state == 'stopped')
@property
def vm_paused(self):
"""Number of VMs paused."""
return self._count_domain(lambda d: d.state == 'paused')
@property
def vm_total(self):
"""Total number of VMs on the hypervisor."""
return self._count_domain()
class StorageIndex(object):
"""Keep an index of all storage volume paths."""
def __init__(self, handler, lv_con):
:param handler: Hypervisor handler instance
:param lv_con: Libvirt connection
"""
self.handler = handler
self.lv_con = lv_con
self.storages = dict(
(s.name, s) for s in imap(
Storage,
imap(
lv_con.storagePoolLookupByName,
chain(
lv_con.listDefinedStoragePools(),
lv_con.listStoragePools(),
),
),
),
)
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
self.paths = None
self.update_path_index()
def update(self):
"""Update storage pools and volumes."""
# go through all storage pools and check if it is already in the index
for lv_storage in imap(
self.lv_con.storagePoolLookupByName,
chain(
self.lv_con.listDefinedStoragePools(),
self.lv_con.listStoragePools(),
),
):
if lv_storage.name() in self.storages:
# update
self.storages[lv_storage.name()].update()
else:
# add storage pool
s = Storage(lv_storage)
self.storages[s.name] = s
# add tags
self.handler.tag_db.add_tags((
Tag('sto%s_state' % s.name, lambda: s.state, 5, 5),
Tag('sto%s_size' % s.name, lambda: s.capacity, 5, 5),
Tag('sto%s_free' % s.name, lambda: s.available, 5, 5),
Tag('sto%s_used' % s.name,
lambda: s.capacity - s.available, 5, 5),
Tag('sto%s_type' % s.name, lambda: s.type, 5, 5),
))
self.update_path_index()
def update_path_index(self):
(v.path, v) for v in chain.from_iterable(imap(
lambda s: s.volumes.itervalues(),
self.storages.itervalues(),
)),
)
def get_volume(self, path):
return self.paths.get(path)
def get_storage(self, name):
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
def create_volume(self, pool_name, volume_name, capacity):
"""Create a new volume in the storage pool.
:param str name: name for the volume
:param int capacity: size for the volume
"""
# get volume
logger.debug('asked pool %s', pool_name)
logger.debug('Pool state %s', self.storages)
try:
pool = self.storages[pool_name]
except KeyError:
raise PoolStorageError('Invalid pool name')
if pool is None:
raise Exception('Storage pool not found')
try:
new_volume = pool.lv_storage.createXML("""<volume>
<name>%s</name>
<capacity>%d</capacity>
</volume>""" % (volume_name, capacity), 0)
except libvirt.libvirtError:
logger.exception('Error while creating volume')
raise
new_volume = Volume(new_volume)
# if success add the volume to the index
self.paths[new_volume.path] = new_volume
# and also to its storage pool
self.storages[new_volume.storage].volumes[new_volume.name] = new_volume
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
def delete_volume(self, pool_name, volume_name):
"""Delete a volume in the givent storage pool.
:param str pool_name: name for the storage pool
:param str volume_name: name for the volume
"""
# get volume
try:
pool = self.storages[pool_name]
except KeyError:
raise PoolStorageError('Invalid pool name')
try:
volume = pool.volumes[volume_name]
except KeyError:
raise PoolStorageError('Invalid volume name')
# delete from index
del self.paths[volume.path]
del self.storages[pool_name].volumes[volume_name]
# delete volume
try:
volume.lv_volume.delete(0)
except libvirt.libvirtError:
logger.exception('Error while deleting volume')
raise