def attach_volume(self, blockdevice_id, attach_to):
"""
Attach ``blockdevice_id`` to the node indicated by ``attach_to``.
:param unicode blockdevice_id: The unique identifier for the block
device being attached.
:param unicode attach_to: An identifier like the one returned by the
``compute_instance_id`` method indicating the
node to which to attach the volume.
:raises UnknownVolume: If the supplied ``blockdevice_id`` does not
exist
:raises AlreadyAttachedVolume: If the supplied ``blockdevice_id`` is
already attached
:returns: A ``BlockDeviceVolume`` with a ``attached_to`` attribute set
to ``attach_to``
"""
blockdevice_id_str = self._vol_f2n(blockdevice_id)
logger.debug('Attaching volume %s to %s', blockdevice_id, attach_to)
if not self._volume_exists(blockdevice_id=blockdevice_id):
raise UnknownVolume(blockdevice_id)
if self._volume_attached(blockdevice_id=blockdevice_id):
raise AlreadyAttachedVolume(blockdevice_id)
self.driver.attach_volume(pool_name=self.pool_name,
volume_name=blockdevice_id_str,
igroup_name=attach_to)
# The volume is attached. Now extract the other properties of the
# volume to create a BlockDeviceVolume.
volumes = self.list_volumes()
for volume in volumes:
if volume.blockdevice_id == blockdevice_id:
return _blockdevicevolume_from_blockdevice_id(
blockdevice_id=volume.blockdevice_id,
size=int(volume.size),
attached_to=attach_to)
raise UnknownVolume(blockdevice_id)
def _get_vol_details(self, blockdevice_id):
"""
:param blockdevice_id - volume id
:return:volume details
:exception: Unknown volume
"""
try:
vol = self.mgmt.request('volumes', 'GET', name=blockdevice_id)
vol_content = vol['content']
if int(vol_content['num-of-lun-mappings']) == 0:
is_attached_to = None
else:
is_attached_to = unicode(vol_content['lun-mapping-list'][0][0][1])
volume = _blockdevicevolume_from_blockdevice_id(
blockdevice_id=blockdevice_id,
size=self._convert_size(int(vol_content['vol-size'])),
attached_to=is_attached_to
)
return volume
except DeviceExceptionObjNotFound as exc:
raise UnknownVolume(blockdevice_id)
def _get_vol_details(self, blockdevice_id):
"""
:param blockdevice_id - volume id
:return:volume details
:exception: Unknown volume
"""
try:
vol = self.mgmt.request('volumes', 'GET', name=blockdevice_id)
vol_content = vol['content']
if int(vol_content['num-of-lun-mappings']) == 0:
is_attached_to = None
else:
is_attached_to = unicode(
vol_content['lun-mapping-list'][0][0][1])
volume = _blockdevicevolume_from_blockdevice_id(
blockdevice_id=blockdevice_id,
size=self._convert_size(int(vol_content['vol-size'])),
attached_to=is_attached_to)
return volume
except DeviceExceptionObjNotFound as exc:
raise UnknownVolume(blockdevice_id)
def list_volumes(self):
"""
List all the block devices available via the back end API.
:return: The :py:class:`~flocker.node.agents.blockdevice.BlockDeviceVolume`
volumes
:rtype: list
"""
logger.debug('Getting a list of block device volumes')
netapp_volumes = self.driver.volumes(self.vserver,
pool_name=self.pool_name)
block_device_volumes = []
for netapp_volume in netapp_volumes:
logger.debug('Creating a BlockDeviceVolume object for %s',
netapp_volume)
try:
# Create a BlockDeviceVolume, and append it to list.
attached_to = None
# TODO: Clean this up a bit
if unicode(netapp_volume['attached_to']) != 'None':
attached_to = unicode(netapp_volume['attached_to'])
volume = _blockdevicevolume_from_blockdevice_id(
blockdevice_id=unicode(self._vol_n2f(
netapp_volume['blockdevice_id'])),
size=int(netapp_volume['size']),
attached_to=attached_to)
block_device_volumes.append(volume)
except Exception: # TODO: Too broad, make more specific
logger.exception('Unexpected error while creating a '
'BlockDeviceVolume for %s', netapp_volume)
logger.debug('Found the following block device volumes: %s',
block_device_volumes)
return block_device_volumes
