import logging import os import sys import signal import socket import time import weakref import traceback from StringIO import StringIO from itertools import chain, imap from xml.etree import cElementTree as et import libvirt from sjrpc.utils import threadless, pass_connection 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, ) from cloudcontrol.node.utils import close_fds, set_signal_map logger = logging.getLogger(__name__) # FIXME find a way to refactor Handler and Hypervisor class class Handler(HostHandler): def __init__(self, *args, **kwargs): """ :param loop: MainLoop instance :param hypervisor_name: hypervisor name """ 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), Tag('sto%s_used' % name, lambda: storage.capacity - storage.available, 5, 5), Tag('sto%s_type' % name, lambda: storage.type, 5, 5), )) # register domains for dom in self.hypervisor.domains.itervalues(): self.tag_db.add_sub_object(dom.name, dom.tags.itervalues()) # we must refresh those tags only when domains tags are registered to # have the calculated values for tag in ('cpualloc', 'cpurunning', 'memalloc', 'memrunning'): self.tag_db['__main__'][tag].update_value() 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) self.main.reset_handler('vm_disable_virtio_cache', self.vm_disable_virtio_cache) self.main.reset_handler('vm_set_autostart', self.vm_set_autostart) # 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 # refresh those tags for tag in ('cpualloc', 'cpurunning', 'memalloc', 'memrunning'): self.tag_db['__main__'][tag].update_value() # 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, 'sto%s_type' % 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_destroy') 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') self.main.remove_handler('vm_open_console') self.main.remove_handler('vm_disable_virtio_cache') self.main.remove_handler('vm_set_autostart') # 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): logger.debug('VM undefine %s', name) vm = self.hypervisor.domains.get(name) if vm is not None: vm.undefine() def vm_export(self, name, format='xml'): logger.debug('VM export %s', name) 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 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) """ 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 # 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 try: pid = os.fork() except OSError: logger.error('Cannot fork before running live migration') raise if pid == 0: # child sys.stderr.write('Hello from child !\n') sys.stderr.write('Debug is %s\n' % self.main.config.debug) try: close_fds(debug=self.main.config.debug) set_signal_map({ signal.SIGTERM: lambda *args: os._exit(1), signal.SIGUSR1: signal.SIG_IGN, signal.SIGINT: signal.SIG_IGN, # FIXME need more signal ? }) except: sys.stderr.write('Error while performing post fork work\n') traceback.print_exc(file=sys.stderr) # create a new libvirt connection dedicated to migration sys.stderr.write('Open new connection to libvirt\n') try: new_con = libvirt.open('qemu:///system') domain = new_con.lookupByUUIDString(vm.uuid) except libvirt.libvirtError: sys.stderr.write('Cannot connect to libvirt\n') os._exit(4) except: # error traceback.print_exc(sys.stderr) os._exit(2) sys.stderr.write('Open destination libvirt connection\n') try: dest_virt_con = libvirt.open( 'qemu+tcp://127.0.0.1:%d/system' % remote_virt_port) except libvirt.libvirtError: sys.stderr.write('Cannot connect to remote libvirt for live' ' migrating vm %s', name) os._exit(5) except: # error traceback.print_exc(file=sys.stderr) os._exit(2) 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 sys.stderr.write('Do migrate\n') 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: sys.stderr('libvirt error during migration\n') traceback.print_exc(file=sys.stderr) os._exit(1) except: # whatever the matter is we MUST NOT return to libev or sjRPC sys.stderr('error during migration\n') traceback.print_exc(file=sys.stderr) os._exit(2) else: os._exit(0) finally: new_con.close() 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 logger.debug('Status: %s', status) 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 == 4: raise VMMigrationError('Cannot open new connection to' ' libvirt') elif status == 5: raise VMMigrationError('Cannot open connection to' ' remote libvirt') elif 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 @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 vm_disable_virtio_cache(self, name): """Set virtio cache to none on VM disks. :param name: VM name """ vm = self.hypervisor.domains[name] # get VM XML try: xml = vm.lv_dom.XMLDesc(0) except libvirt.libvirtError: logger.exception('Error while getting domain XML from libvirt, %s', vm.name) raise xml_tree = et.ElementTree() xml_tree.parse(StringIO(xml)) for disk in xml_tree.findall('devices/disk'): # check that disk is virtio target = disk.find('target') if target is None or target.get('bus') != 'virtio': continue # modify cache attr driver = disk.find('driver') assert driver is not None driver.set('cache', 'none') logger.debug('Set cache attribute for disk %s of VM %s', target.get('dev'), name) # write back the XML tree out = StringIO() xml_tree.write(out) # check encoding is fine try: self.hypervisor.vir_con.defineXML(out.getvalue()) except libvirt.libvirtError: logger.exception('Cannot update XML file for domain %s', name) raise def vm_set_autostart(self, name, autostart=True): """Set autostart on VM. :param name: VM name :param bool autostart: autostart value to set """ vm = self.hypervisor.domains[name] vm.lv_dom.setAutostart(int(bool(autostart))) # update autostart value now instead of 10 seconds lag vm.tags['autostart'].update_value() 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 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') job.wait() 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') job = self.main.job_manager.get(job_id) 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 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) job.start() job.wait() except Exception: logger.exception('Error while exporting volume') raise logger.debug('Export volume successfull') return dict(id=job.id, log='', checksum=job.checksum) @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) 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'])) job.start() @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') job.start() @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']) job = self.main.job_manager.get(res['jid']) job.wait() 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.main.evloop, 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) # libvirt event loop abstraction self.vir_event_loop = VirEventLoop(self.handler.main.evloop) self.vir_con = libvirt.open('qemu:///system') # currently only support KVM # findout storage 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) # find started domains 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) # TODO delet objects 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() 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.domains[vm.name] = vm self.handler.tag_db.add_sub_object(vm.name, vm.tags.itervalues()) self.update_domain_count() elif event == 'Removed': vm_name = dom.name() self.vm_unregister(vm_name) logger.info('Removed domain %s', vm_name) elif event in ('Started', 'Suspended', 'Resumed', 'Stopped', 'Saved', 'Restored'): vm = self.domains.get(dom.name()) # sometimes libvirt sent a start event before a created event so be # careful if vm is not None: 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', 'cpualloc', 'cpurunning', 'memalloc', 'memrunning'): 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(), ), ), ), ) 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): self.paths = dict( (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): return self.storages.get(name) 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(""" %s %d """ % (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 return new_volume 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 class Storage(object): """Storage abstraction.""" def __init__(self, lv_storage): """ :param lv_storage: Libvirt pool storage instance """ self.uuid = lv_storage.UUID() self.name = lv_storage.name() self.lv_storage = lv_storage self.state, self.capacity = None, None self.allocation, self.available = None, None self.type = et.ElementTree().parse( StringIO(lv_storage.XMLDesc(0))).get('type') self.volumes = dict((v.name, v) for v in imap( Volume, (lv_storage.storageVolLookupByName(n) for n in lv_storage.listVolumes()), )) self.update_attr() def update(self): self.update_attr() # update volumes for vol_name in self.lv_storage.listVolumes(): if vol_name in self.volumes: # update volume self.volumes[vol_name].update() else: # add volume v = Volume(self.lv_storage.storageVolLookupByName(vol_name)) self.volumes[v.name] = v def update_attr(self): self.state, self.capacity, self.allocation, self.available = self.lv_storage.info() self.state = STORAGE_STATES[self.state] self.type = et.ElementTree().parse( StringIO(self.lv_storage.XMLDesc(0))).get('type') class Volume(object): """Volume abstraction.""" def __init__(self, lv_volume): """ :param lv_volume: Libvirt volume instance """ self.storage = lv_volume.storagePoolLookupByVolume().name() self.path = lv_volume.path() self.name = lv_volume.name() self.capacity, self.allocation = None, None self.lv_volume = lv_volume self.update() def update(self): self.capacity, self.allocation = self.lv_volume.info()[1:]