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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):
return self.storages.get(name)
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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
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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.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(
(lv_storage.storageVolLookupByName(n) for n in
lv_storage.listVolumes()),
))
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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."""
"""
: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.update()
def update(self):
self.capacity, self.allocation = self.lv_volume.info()[1:]