ce64b6abfc
Move it here so that it can be kept in sync with openstack-common using the new update.py script for code in openstack-common's incubation area. See here for more details: http://wiki.openstack.org/CommonLibrary#Incubation Note: this commit just moves the existing code in Nova with no other changes. A subsequent commit will sync it with latest openstack-common so that it is easier see the new changes. Change-Id: If88d678b1b9bad3d37117de7f7159d7fea8ab4c8
420 lines
16 KiB
Python
420 lines
16 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2011 Zadara Storage Inc.
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# Copyright (c) 2011 OpenStack LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Handles all requests relating to Virtual Storage Arrays (VSAs).
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Experimental code. Requires special VSA image.
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For assistance and guidelines pls contact
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Zadara Storage Inc & Openstack community
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"""
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import sys
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from nova import compute
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from nova import exception
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from nova import flags
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from nova import log as logging
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from nova.openstack.common import cfg
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from nova import rpc
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from nova import volume
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from nova.compute import instance_types
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from nova.db import base
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from nova.volume import volume_types
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class VsaState:
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CREATING = 'creating' # VSA creating (not ready yet)
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LAUNCHING = 'launching' # Launching VCs (all BE volumes were created)
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CREATED = 'created' # VSA fully created and ready for use
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PARTIAL = 'partial' # Some BE drives were allocated
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FAILED = 'failed' # Some BE storage allocations failed
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DELETING = 'deleting' # VSA started the deletion procedure
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vsa_opts = [
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cfg.StrOpt('vsa_ec2_access_key',
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default=None,
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help='EC2 access key used by VSA for accessing nova'),
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cfg.StrOpt('vsa_ec2_user_id',
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default=None,
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help='User ID used by VSA for accessing nova'),
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cfg.BoolOpt('vsa_multi_vol_creation',
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default=True,
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help='Ask scheduler to create multiple volumes in one call'),
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cfg.StrOpt('vsa_volume_type_name',
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default='VSA volume type',
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help='Name of volume type associated with FE VSA volumes'),
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]
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FLAGS = flags.FLAGS
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FLAGS.add_options(vsa_opts)
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LOG = logging.getLogger('nova.vsa')
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class API(base.Base):
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"""API for interacting with the VSA manager."""
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def __init__(self, compute_api=None, volume_api=None, **kwargs):
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self.compute_api = compute_api or compute.API()
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self.volume_api = volume_api or volume.API()
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super(API, self).__init__(**kwargs)
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def _check_volume_type_correctness(self, vol_type):
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if vol_type.get('extra_specs') is None or\
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vol_type['extra_specs'].get('type') != 'vsa_drive' or\
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vol_type['extra_specs'].get('drive_type') is None or\
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vol_type['extra_specs'].get('drive_size') is None:
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raise exception.ApiError(_("Invalid drive type %s")
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% vol_type['name'])
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def _get_default_vsa_instance_type(self):
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return instance_types.get_instance_type_by_name(
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FLAGS.default_vsa_instance_type)
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def _check_storage_parameters(self, context, vsa_name, storage,
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shared, first_index=0):
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"""
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Translates storage array of disks to the list of volumes
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:param storage: List of dictionaries with following keys:
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disk_name, num_disks, size
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:param shared: Specifies if storage is dedicated or shared.
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For shared storage disks split into partitions
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"""
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volume_params = []
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for node in storage:
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name = node.get('drive_name', None)
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num_disks = node.get('num_drives', 1)
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if name is None:
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raise exception.ApiError(_("No drive_name param found in %s")
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% node)
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try:
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vol_type = volume_types.get_volume_type_by_name(context, name)
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except exception.NotFound:
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raise exception.ApiError(_("Invalid drive type name %s")
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% name)
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self._check_volume_type_correctness(vol_type)
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# if size field present - override disk size specified in DB
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size = int(node.get('size',
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vol_type['extra_specs'].get('drive_size')))
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if shared:
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part_size = FLAGS.vsa_part_size_gb
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total_capacity = num_disks * size
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num_volumes = total_capacity / part_size
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size = part_size
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else:
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num_volumes = num_disks
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size = 0 # special handling for full drives
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for i in range(num_volumes):
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volume_name = "drive-%03d" % first_index
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first_index += 1
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volume_desc = 'BE volume for VSA %s type %s' % \
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(vsa_name, name)
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volume = {
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'size': size,
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'name': volume_name,
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'description': volume_desc,
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'volume_type_id': vol_type['id'],
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}
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volume_params.append(volume)
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return volume_params
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def create(self, context, display_name='', display_description='',
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vc_count=1, instance_type=None, image_name=None,
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availability_zone=None, storage=[], shared=None):
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"""
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Provision VSA instance with corresponding compute instances
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and associated volumes
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:param storage: List of dictionaries with following keys:
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disk_name, num_disks, size
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:param shared: Specifies if storage is dedicated or shared.
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For shared storage disks split into partitions
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"""
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LOG.info(_("*** Experimental VSA code ***"))
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if vc_count > FLAGS.max_vcs_in_vsa:
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LOG.warning(_("Requested number of VCs (%d) is too high."\
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" Setting to default"), vc_count)
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vc_count = FLAGS.max_vcs_in_vsa
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if instance_type is None:
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instance_type = self._get_default_vsa_instance_type()
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if availability_zone is None:
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availability_zone = FLAGS.storage_availability_zone
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if storage is None:
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storage = []
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if not shared or shared == 'False':
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shared = False
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else:
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shared = True
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# check if image is ready before starting any work
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if image_name is None:
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image_name = FLAGS.vc_image_name
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try:
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image_service = self.compute_api.image_service
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vc_image = image_service.show_by_name(context, image_name)
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vc_image_href = vc_image['id']
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except exception.ImageNotFound:
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raise exception.ApiError(_("Failed to find configured image %s")
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% image_name)
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options = {
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'display_name': display_name,
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'display_description': display_description,
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'project_id': context.project_id,
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'availability_zone': availability_zone,
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'instance_type_id': instance_type['id'],
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'image_ref': vc_image_href,
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'vc_count': vc_count,
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'status': VsaState.CREATING,
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}
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LOG.info(_("Creating VSA: %s") % options)
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# create DB entry for VSA instance
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try:
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vsa_ref = self.db.vsa_create(context, options)
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except exception.Error:
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raise exception.ApiError(_(sys.exc_info()[1]))
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vsa_id = vsa_ref['id']
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vsa_name = vsa_ref['name']
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# check storage parameters
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try:
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volume_params = self._check_storage_parameters(context, vsa_name,
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storage, shared)
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except exception.ApiError:
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self.db.vsa_destroy(context, vsa_id)
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raise exception.ApiError(_("Error in storage parameters: %s")
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% storage)
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# after creating DB entry, re-check and set some defaults
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updates = {}
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if (not hasattr(vsa_ref, 'display_name') or
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vsa_ref.display_name is None or
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vsa_ref.display_name == ''):
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updates['display_name'] = display_name = vsa_name
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updates['vol_count'] = len(volume_params)
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vsa_ref = self.update(context, vsa_id, **updates)
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# create volumes
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if FLAGS.vsa_multi_vol_creation:
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if len(volume_params) > 0:
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request_spec = {
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'num_volumes': len(volume_params),
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'vsa_id': str(vsa_id),
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'volumes': volume_params,
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}
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rpc.cast(context,
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FLAGS.scheduler_topic,
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{"method": "create_volumes",
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"args": {"topic": FLAGS.volume_topic,
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"request_spec": request_spec,
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"availability_zone": availability_zone}})
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else:
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# create BE volumes one-by-one
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for vol in volume_params:
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try:
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vol_name = vol['name']
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vol_size = vol['size']
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vol_type_id = vol['volume_type_id']
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LOG.debug(_("VSA ID %(vsa_id)d %(vsa_name)s: Create "\
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"volume %(vol_name)s, %(vol_size)d GB, "\
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"type %(vol_type_id)s"), locals())
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vol_type = volume_types.get_volume_type(context,
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vol['volume_type_id'])
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vol_ref = self.volume_api.create(context,
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vol_size,
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vol_name,
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vol['description'],
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None,
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volume_type=vol_type,
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metadata=dict(to_vsa_id=str(vsa_id)),
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availability_zone=availability_zone)
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except Exception:
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self.update_vsa_status(context, vsa_id,
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status=VsaState.PARTIAL)
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raise
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if len(volume_params) == 0:
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# No BE volumes - ask VSA manager to start VCs
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rpc.cast(context,
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FLAGS.vsa_topic,
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{"method": "create_vsa",
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"args": {"vsa_id": str(vsa_id)}})
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return vsa_ref
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def update_vsa_status(self, context, vsa_id, status):
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updates = dict(status=status)
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LOG.info(_("VSA ID %(vsa_id)d: Update VSA status to %(status)s"),
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locals())
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return self.update(context, vsa_id, **updates)
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def update(self, context, vsa_id, **kwargs):
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"""Updates the VSA instance in the datastore.
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:param context: The security context
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:param vsa_id: ID of the VSA instance to update
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:param kwargs: All additional keyword args are treated
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as data fields of the instance to be
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updated
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:returns: None
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"""
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LOG.info(_("VSA ID %(vsa_id)d: Update VSA call"), locals())
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updatable_fields = ['status', 'vc_count', 'vol_count',
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'display_name', 'display_description']
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changes = {}
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for field in updatable_fields:
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if field in kwargs:
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changes[field] = kwargs[field]
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vc_count = kwargs.get('vc_count', None)
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if vc_count is not None:
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# VP-TODO: This request may want to update number of VCs
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# Get number of current VCs and add/delete VCs appropriately
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vsa = self.get(context, vsa_id)
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vc_count = int(vc_count)
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if vc_count > FLAGS.max_vcs_in_vsa:
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LOG.warning(_("Requested number of VCs (%d) is too high."\
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" Setting to default"), vc_count)
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vc_count = FLAGS.max_vcs_in_vsa
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if vsa['vc_count'] != vc_count:
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self.update_num_vcs(context, vsa, vc_count)
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changes['vc_count'] = vc_count
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return self.db.vsa_update(context, vsa_id, changes)
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def update_num_vcs(self, context, vsa, vc_count):
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vsa_name = vsa['name']
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old_vc_count = int(vsa['vc_count'])
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if vc_count > old_vc_count:
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add_cnt = vc_count - old_vc_count
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LOG.debug(_("Adding %(add_cnt)s VCs to VSA %(vsa_name)s."),
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locals())
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# VP-TODO: actual code for adding new VCs
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elif vc_count < old_vc_count:
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del_cnt = old_vc_count - vc_count
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LOG.debug(_("Deleting %(del_cnt)s VCs from VSA %(vsa_name)s."),
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locals())
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# VP-TODO: actual code for deleting extra VCs
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def _force_volume_delete(self, ctxt, volume):
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"""Delete a volume, bypassing the check that it must be available."""
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host = volume['host']
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if not host:
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# Deleting volume from database and skipping rpc.
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self.db.volume_destroy(ctxt, volume['id'])
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return
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rpc.cast(ctxt,
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self.db.queue_get_for(ctxt, FLAGS.volume_topic, host),
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{"method": "delete_volume",
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"args": {"volume_id": volume['id']}})
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def delete_vsa_volumes(self, context, vsa_id, direction,
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force_delete=True):
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if direction == "FE":
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volumes = self.get_all_vsa_volumes(context, vsa_id)
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else:
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volumes = self.get_all_vsa_drives(context, vsa_id)
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for volume in volumes:
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try:
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vol_name = volume['name']
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LOG.info(_("VSA ID %(vsa_id)s: Deleting %(direction)s "\
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"volume %(vol_name)s"), locals())
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self.volume_api.delete(context, volume)
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except exception.ApiError:
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LOG.info(_("Unable to delete volume %s"), volume['name'])
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if force_delete:
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LOG.info(_("VSA ID %(vsa_id)s: Forced delete. "\
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"%(direction)s volume %(vol_name)s"), locals())
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self._force_volume_delete(context, volume)
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def delete(self, context, vsa_id):
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"""Terminate a VSA instance."""
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LOG.info(_("Going to try to terminate VSA ID %s"), vsa_id)
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# Delete all FrontEnd and BackEnd volumes
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self.delete_vsa_volumes(context, vsa_id, "FE", force_delete=True)
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self.delete_vsa_volumes(context, vsa_id, "BE", force_delete=True)
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# Delete all VC instances
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instances = self.compute_api.get_all(context,
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search_opts={'metadata': dict(vsa_id=str(vsa_id))})
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for instance in instances:
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name = instance['name']
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LOG.debug(_("VSA ID %(vsa_id)s: Delete instance %(name)s"),
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locals())
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self.compute_api.delete(context, instance['id'])
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# Delete VSA instance
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self.db.vsa_destroy(context, vsa_id)
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def get(self, context, vsa_id):
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rv = self.db.vsa_get(context, vsa_id)
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return rv
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def get_all(self, context):
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if context.is_admin:
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return self.db.vsa_get_all(context)
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return self.db.vsa_get_all_by_project(context, context.project_id)
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def get_vsa_volume_type(self, context):
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name = FLAGS.vsa_volume_type_name
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try:
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vol_type = volume_types.get_volume_type_by_name(context, name)
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except exception.NotFound:
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volume_types.create(context, name,
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extra_specs=dict(type='vsa_volume'))
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vol_type = volume_types.get_volume_type_by_name(context, name)
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return vol_type
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def get_all_vsa_instances(self, context, vsa_id):
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return self.compute_api.get_all(context,
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search_opts={'metadata': dict(vsa_id=str(vsa_id))})
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def get_all_vsa_volumes(self, context, vsa_id):
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return self.volume_api.get_all(context,
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search_opts={'metadata': dict(from_vsa_id=str(vsa_id))})
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def get_all_vsa_drives(self, context, vsa_id):
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return self.volume_api.get_all(context,
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search_opts={'metadata': dict(to_vsa_id=str(vsa_id))})
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