667 lines
25 KiB
Python
667 lines
25 KiB
Python
# Copyright (c) 2012 Zadara Storage, Inc.
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# Copyright (c) 2012 OpenStack Foundation
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# All Rights Reserved.
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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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Volume driver for Zadara Virtual Private Storage Array (VPSA).
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This driver requires VPSA with API ver.13.07 or higher.
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"""
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import httplib
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from lxml import etree
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from oslo.config import cfg
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from cinder import exception
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from cinder.openstack.common import log as logging
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from cinder.volume import driver
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LOG = logging.getLogger(__name__)
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zadara_opts = [
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cfg.StrOpt('zadara_vpsa_ip',
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default=None,
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help='Management IP of Zadara VPSA'),
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cfg.StrOpt('zadara_vpsa_port',
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default=None,
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help='Zadara VPSA port number'),
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cfg.BoolOpt('zadara_vpsa_use_ssl',
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default=False,
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help='Use SSL connection'),
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cfg.StrOpt('zadara_user',
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default=None,
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help='User name for the VPSA'),
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cfg.StrOpt('zadara_password',
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default=None,
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help='Password for the VPSA',
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secret=True),
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cfg.StrOpt('zadara_vpsa_poolname',
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default=None,
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help='Name of VPSA storage pool for volumes'),
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cfg.BoolOpt('zadara_vol_thin',
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default=True,
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help='Default thin provisioning policy for volumes'),
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cfg.BoolOpt('zadara_vol_encrypt',
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default=False,
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help='Default encryption policy for volumes'),
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cfg.StrOpt('zadara_vol_name_template',
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default='OS_%s',
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help='Default template for VPSA volume names'),
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cfg.BoolOpt('zadara_vpsa_auto_detach_on_delete',
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default=True,
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help="Automatically detach from servers on volume delete"),
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cfg.BoolOpt('zadara_vpsa_allow_nonexistent_delete',
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default=True,
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help="Don't halt on deletion of non-existing volumes"), ]
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CONF = cfg.CONF
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CONF.register_opts(zadara_opts)
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class ZadaraVPSAConnection(object):
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"""Executes volume driver commands on VPSA."""
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def __init__(self, conf):
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self.conf = conf
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self.access_key = None
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self.ensure_connection()
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def _generate_vpsa_cmd(self, cmd, **kwargs):
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"""Generate command to be sent to VPSA."""
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def _joined_params(params):
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param_str = []
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for k, v in params.items():
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param_str.append("%s=%s" % (k, v))
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return '&'.join(param_str)
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# Dictionary of applicable VPSA commands in the following format:
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# 'command': (method, API_URL, {optional parameters})
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vpsa_commands = {
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'login': ('POST',
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'/api/users/login.xml',
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{'user': self.conf.zadara_user,
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'password': self.conf.zadara_password}),
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# Volume operations
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'create_volume': ('POST',
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'/api/volumes.xml',
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{'name': kwargs.get('name'),
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'capacity': kwargs.get('size'),
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'pool': self.conf.zadara_vpsa_poolname,
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'thin': 'YES'
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if self.conf.zadara_vol_thin else 'NO',
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'crypt': 'YES'
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if self.conf.zadara_vol_encrypt else 'NO'}),
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'delete_volume': ('DELETE',
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'/api/volumes/%s.xml' % kwargs.get('vpsa_vol'),
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{}),
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'expand_volume': ('POST',
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'/api/volumes/%s/expand.xml'
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% kwargs.get('vpsa_vol'),
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{'capacity': kwargs.get('size')}),
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# Snapshot operations
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'create_snapshot': ('POST',
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'/api/consistency_groups/%s/snapshots.xml'
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% kwargs.get('cg_name'),
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{'display_name': kwargs.get('snap_name')}),
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'delete_snapshot': ('DELETE',
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'/api/snapshots/%s.xml'
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% kwargs.get('snap_id'),
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{}),
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'create_clone_from_snap': ('POST',
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'/api/consistency_groups/%s/clone.xml'
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% kwargs.get('cg_name'),
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{'name': kwargs.get('name'),
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'snapshot': kwargs.get('snap_id')}),
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'create_clone': ('POST',
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'/api/consistency_groups/%s/clone.xml'
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% kwargs.get('cg_name'),
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{'name': kwargs.get('name')}),
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# Server operations
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'create_server': ('POST',
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'/api/servers.xml',
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{'display_name': kwargs.get('initiator'),
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'iqn': kwargs.get('initiator')}),
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# Attach/Detach operations
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'attach_volume': ('POST',
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'/api/servers/%s/volumes.xml'
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% kwargs.get('vpsa_srv'),
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{'volume_name[]': kwargs.get('vpsa_vol'),
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'force': 'NO'}),
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'detach_volume': ('POST',
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'/api/volumes/%s/detach.xml'
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% kwargs.get('vpsa_vol'),
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{'server_name[]': kwargs.get('vpsa_srv'),
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'force': 'NO'}),
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# Get operations
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'list_volumes': ('GET',
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'/api/volumes.xml',
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{}),
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'list_pools': ('GET',
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'/api/pools.xml',
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{}),
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'list_controllers': ('GET',
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'/api/vcontrollers.xml',
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{}),
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'list_servers': ('GET',
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'/api/servers.xml',
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{}),
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'list_vol_attachments': ('GET',
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'/api/volumes/%s/servers.xml'
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% kwargs.get('vpsa_vol'),
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{}),
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'list_vol_snapshots': ('GET',
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'/api/consistency_groups/%s/snapshots.xml'
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% kwargs.get('cg_name'),
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{})}
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if cmd not in vpsa_commands.keys():
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raise exception.UnknownCmd(cmd=cmd)
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else:
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(method, url, params) = vpsa_commands[cmd]
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if method == 'GET':
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# For GET commands add parameters to the URL
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params.update(dict(access_key=self.access_key,
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page=1, start=0, limit=0))
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url += '?' + _joined_params(params)
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body = ''
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elif method == 'DELETE':
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# For DELETE commands add parameters to the URL
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params.update(dict(access_key=self.access_key))
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url += '?' + _joined_params(params)
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body = ''
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elif method == 'POST':
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if self.access_key:
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params.update(dict(access_key=self.access_key))
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body = _joined_params(params)
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else:
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raise exception.UnknownCmd(cmd=method)
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return (method, url, body)
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def ensure_connection(self, cmd=None):
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"""Retrieve access key for VPSA connection."""
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if self.access_key or cmd == 'login':
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return
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cmd = 'login'
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xml_tree = self.send_cmd(cmd)
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user = xml_tree.find('user')
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if user is None:
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raise exception.MalformedResponse(cmd=cmd,
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reason='no "user" field')
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access_key = user.findtext('access-key')
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if access_key is None:
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raise exception.MalformedResponse(cmd=cmd,
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reason='no "access-key" field')
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self.access_key = access_key
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def send_cmd(self, cmd, **kwargs):
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"""Send command to VPSA Controller."""
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self.ensure_connection(cmd)
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(method, url, body) = self._generate_vpsa_cmd(cmd, **kwargs)
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LOG.debug('Sending %(method)s to %(url)s. Body "%(body)s"',
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{'method': method, 'url': url, 'body': body})
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if self.conf.zadara_vpsa_use_ssl:
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connection = httplib.HTTPSConnection(self.conf.zadara_vpsa_ip,
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self.conf.zadara_vpsa_port)
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else:
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connection = httplib.HTTPConnection(self.conf.zadara_vpsa_ip,
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self.conf.zadara_vpsa_port)
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connection.request(method, url, body)
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response = connection.getresponse()
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if response.status != 200:
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connection.close()
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raise exception.BadHTTPResponseStatus(status=response.status)
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data = response.read()
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connection.close()
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xml_tree = etree.fromstring(data)
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status = xml_tree.findtext('status')
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if status != '0':
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raise exception.FailedCmdWithDump(status=status, data=data)
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if method in ['POST', 'DELETE']:
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LOG.debug('Operation completed. %(data)s', {'data': data})
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return xml_tree
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class ZadaraVPSAISCSIDriver(driver.ISCSIDriver):
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"""Zadara VPSA iSCSI volume driver."""
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VERSION = '13.07'
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def __init__(self, *args, **kwargs):
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super(ZadaraVPSAISCSIDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(zadara_opts)
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def do_setup(self, context):
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"""Any initialization the volume driver does while starting.
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Establishes initial connection with VPSA and retrieves access_key.
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"""
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self.vpsa = ZadaraVPSAConnection(self.configuration)
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def check_for_setup_error(self):
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"""Returns an error (exception) if prerequisites aren't met."""
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self.vpsa.ensure_connection()
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def local_path(self, volume):
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"""Return local path to existing local volume."""
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raise NotImplementedError()
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def _xml_parse_helper(self, xml_tree, first_level, search_tuple,
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first=True):
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"""Helper for parsing VPSA's XML output.
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Returns single item if first==True or list for multiple selection.
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If second argument in search_tuple is None - returns all items with
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appropriate key.
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"""
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objects = xml_tree.find(first_level)
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if objects is None:
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return None
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result_list = []
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(key, value) = search_tuple
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for object in objects.getchildren():
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found_value = object.findtext(key)
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if found_value and (found_value == value or value is None):
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if first:
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return object
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else:
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result_list.append(object)
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return result_list if result_list else None
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def _get_vpsa_volume_name_and_size(self, name):
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"""Return VPSA's name & size for the volume."""
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xml_tree = self.vpsa.send_cmd('list_volumes')
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volume = self._xml_parse_helper(xml_tree, 'volumes',
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('display-name', name))
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if volume is not None:
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return (volume.findtext('name'),
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int(volume.findtext('virtual-capacity')))
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return (None, None)
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def _get_vpsa_volume_name(self, name):
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"""Return VPSA's name for the volume."""
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(vol_name, size) = self._get_vpsa_volume_name_and_size(name)
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return vol_name
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def _get_volume_cg_name(self, name):
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"""Return name of the consistency group for the volume."""
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xml_tree = self.vpsa.send_cmd('list_volumes')
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volume = self._xml_parse_helper(xml_tree, 'volumes',
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('display-name', name))
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if volume is not None:
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return volume.findtext('cg-name')
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return None
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def _get_snap_id(self, cg_name, snap_name):
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"""Return snapshot ID for particular volume."""
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xml_tree = self.vpsa.send_cmd('list_vol_snapshots',
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cg_name=cg_name)
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snap = self._xml_parse_helper(xml_tree, 'snapshots',
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('display-name', snap_name))
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if snap is not None:
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return snap.findtext('name')
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return None
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def _get_pool_capacity(self, pool_name):
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"""Return pool's total and available capacities."""
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xml_tree = self.vpsa.send_cmd('list_pools')
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pool = self._xml_parse_helper(xml_tree, 'pools',
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('name', pool_name))
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if pool is not None:
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total = int(pool.findtext('capacity'))
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free = int(float(pool.findtext('available-capacity')))
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LOG.debug('Pool %(name)s: %(total)sGB total, %(free)sGB free',
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{'name': pool_name, 'total': total, 'free': free})
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return (total, free)
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return ('infinite', 'infinite')
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def _get_active_controller_details(self):
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"""Return details of VPSA's active controller."""
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xml_tree = self.vpsa.send_cmd('list_controllers')
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ctrl = self._xml_parse_helper(xml_tree, 'vcontrollers',
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('state', 'active'))
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if ctrl is not None:
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return dict(target=ctrl.findtext('target'),
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ip=ctrl.findtext('iscsi-ip'),
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chap_user=ctrl.findtext('chap-username'),
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chap_passwd=ctrl.findtext('chap-target-secret'))
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return None
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def _get_server_name(self, initiator):
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"""Return VPSA's name for server object with given IQN."""
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xml_tree = self.vpsa.send_cmd('list_servers')
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server = self._xml_parse_helper(xml_tree, 'servers',
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('iqn', initiator))
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if server is not None:
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return server.findtext('name')
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return None
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def _create_vpsa_server(self, initiator):
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"""Create server object within VPSA (if doesn't exist)."""
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vpsa_srv = self._get_server_name(initiator)
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if not vpsa_srv:
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xml_tree = self.vpsa.send_cmd('create_server', initiator=initiator)
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vpsa_srv = xml_tree.findtext('server-name')
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return vpsa_srv
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def create_volume(self, volume):
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"""Create volume."""
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self.vpsa.send_cmd(
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'create_volume',
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name=self.configuration.zadara_vol_name_template % volume['name'],
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size=volume['size'])
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def delete_volume(self, volume):
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"""Delete volume.
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Return ok if doesn't exist. Auto detach from all servers.
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"""
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# Get volume name
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name = self.configuration.zadara_vol_name_template % volume['name']
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vpsa_vol = self._get_vpsa_volume_name(name)
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if not vpsa_vol:
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msg = _('Volume %(name)s could not be found. '
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'It might be already deleted') % {'name': name}
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LOG.warning(msg)
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if self.configuration.zadara_vpsa_allow_nonexistent_delete:
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return
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else:
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raise exception.VolumeNotFound(volume_id=name)
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# Check attachment info and detach from all
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xml_tree = self.vpsa.send_cmd('list_vol_attachments',
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vpsa_vol=vpsa_vol)
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servers = self._xml_parse_helper(xml_tree, 'servers',
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('iqn', None), first=False)
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if servers:
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if not self.configuration.zadara_vpsa_auto_detach_on_delete:
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raise exception.VolumeAttached(volume_id=name)
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for server in servers:
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vpsa_srv = server.findtext('name')
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if vpsa_srv:
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self.vpsa.send_cmd('detach_volume',
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vpsa_srv=vpsa_srv,
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vpsa_vol=vpsa_vol)
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# Delete volume
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self.vpsa.send_cmd('delete_volume', vpsa_vol=vpsa_vol)
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def create_snapshot(self, snapshot):
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"""Creates a snapshot."""
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LOG.debug('Create snapshot: %s', snapshot['name'])
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# Retrieve the CG name for the base volume
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volume_name = self.configuration.zadara_vol_name_template\
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% snapshot['volume_name']
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cg_name = self._get_volume_cg_name(volume_name)
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if not cg_name:
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msg = _('Volume %(name)s not found') % {'name': volume_name}
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LOG.error(msg)
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raise exception.VolumeNotFound(volume_id=volume_name)
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self.vpsa.send_cmd('create_snapshot',
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cg_name=cg_name,
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snap_name=snapshot['name'])
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def delete_snapshot(self, snapshot):
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"""Deletes a snapshot."""
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LOG.debug('Delete snapshot: %s', snapshot['name'])
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# Retrieve the CG name for the base volume
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volume_name = self.configuration.zadara_vol_name_template\
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% snapshot['volume_name']
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cg_name = self._get_volume_cg_name(volume_name)
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if not cg_name:
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# If the volume isn't present, then don't attempt to delete
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LOG.warning(_("snapshot: original volume %s not found, "
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"skipping delete operation")
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% snapshot['volume_name'])
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return True
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snap_id = self._get_snap_id(cg_name, snapshot['name'])
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if not snap_id:
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# If the snapshot isn't present, then don't attempt to delete
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LOG.warning(_("snapshot: snapshot %s not found, "
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"skipping delete operation")
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% snapshot['name'])
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return True
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self.vpsa.send_cmd('delete_snapshot',
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snap_id=snap_id)
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def create_volume_from_snapshot(self, volume, snapshot):
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"""Creates a volume from a snapshot."""
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LOG.debug('Creating volume from snapshot: %s' % snapshot['name'])
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# Retrieve the CG name for the base volume
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volume_name = self.configuration.zadara_vol_name_template\
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% snapshot['volume_name']
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cg_name = self._get_volume_cg_name(volume_name)
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if not cg_name:
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msg = _('Volume %(name)s not found') % {'name': volume_name}
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LOG.error(msg)
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raise exception.VolumeNotFound(volume_id=volume_name)
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snap_id = self._get_snap_id(cg_name, snapshot['name'])
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if not snap_id:
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msg = _('Snapshot %(name)s not found') % {'name': snapshot['name']}
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LOG.error(msg)
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raise exception.VolumeNotFound(volume_id=snapshot['name'])
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|
|
self.vpsa.send_cmd('create_clone_from_snap',
|
|
cg_name=cg_name,
|
|
name=self.configuration.zadara_vol_name_template
|
|
% volume['name'],
|
|
snap_id=snap_id)
|
|
|
|
def create_cloned_volume(self, volume, src_vref):
|
|
"""Creates a clone of the specified volume."""
|
|
|
|
LOG.debug('Creating clone of volume: %s' % src_vref['name'])
|
|
|
|
# Retrieve the CG name for the base volume
|
|
volume_name = self.configuration.zadara_vol_name_template\
|
|
% src_vref['name']
|
|
cg_name = self._get_volume_cg_name(volume_name)
|
|
if not cg_name:
|
|
msg = _('Volume %(name)s not found') % {'name': volume_name}
|
|
LOG.error(msg)
|
|
raise exception.VolumeNotFound(volume_id=volume_name)
|
|
|
|
self.vpsa.send_cmd('create_clone',
|
|
cg_name=cg_name,
|
|
name=self.configuration.zadara_vol_name_template
|
|
% volume['name'])
|
|
|
|
def extend_volume(self, volume, new_size):
|
|
"""Extend an existing volume."""
|
|
# Get volume name
|
|
name = self.configuration.zadara_vol_name_template % volume['name']
|
|
(vpsa_vol, size) = self._get_vpsa_volume_name_and_size(name)
|
|
if not vpsa_vol:
|
|
msg = _('Volume %(name)s could not be found. '
|
|
'It might be already deleted') % {'name': name}
|
|
LOG.error(msg)
|
|
raise exception.VolumeNotFound(volume_id=name)
|
|
|
|
if new_size < size:
|
|
raise exception.InvalidInput(
|
|
reason='%s < current size %s' % (new_size, size))
|
|
|
|
expand_size = new_size - size
|
|
self.vpsa.send_cmd('expand_volume',
|
|
vpsa_vol=vpsa_vol,
|
|
size=expand_size)
|
|
|
|
def create_export(self, context, volume):
|
|
"""Irrelevant for VPSA volumes. Export created during attachment."""
|
|
pass
|
|
|
|
def ensure_export(self, context, volume):
|
|
"""Irrelevant for VPSA volumes. Export created during attachment."""
|
|
pass
|
|
|
|
def remove_export(self, context, volume):
|
|
"""Irrelevant for VPSA volumes. Export removed during detach."""
|
|
pass
|
|
|
|
def initialize_connection(self, volume, connector):
|
|
"""Attach volume to initiator/host.
|
|
|
|
During this call VPSA exposes volume to particular Initiator. It also
|
|
creates a 'server' entity for Initiator (if it was not created before)
|
|
|
|
All necessary connection information is returned, including auth data.
|
|
Connection data (target, LUN) is not stored in the DB.
|
|
"""
|
|
|
|
# Get/Create server name for IQN
|
|
initiator_name = connector['initiator']
|
|
vpsa_srv = self._create_vpsa_server(initiator_name)
|
|
if not vpsa_srv:
|
|
raise exception.ZadaraServerCreateFailure(name=initiator_name)
|
|
|
|
# Get volume name
|
|
name = self.configuration.zadara_vol_name_template % volume['name']
|
|
vpsa_vol = self._get_vpsa_volume_name(name)
|
|
if not vpsa_vol:
|
|
raise exception.VolumeNotFound(volume_id=name)
|
|
|
|
# Get Active controller details
|
|
ctrl = self._get_active_controller_details()
|
|
if not ctrl:
|
|
raise exception.ZadaraVPSANoActiveController()
|
|
|
|
# Attach volume to server
|
|
self.vpsa.send_cmd('attach_volume',
|
|
vpsa_srv=vpsa_srv,
|
|
vpsa_vol=vpsa_vol)
|
|
|
|
# Get connection info
|
|
xml_tree = self.vpsa.send_cmd('list_vol_attachments',
|
|
vpsa_vol=vpsa_vol)
|
|
server = self._xml_parse_helper(xml_tree, 'servers',
|
|
('iqn', initiator_name))
|
|
if server is None:
|
|
raise exception.ZadaraAttachmentsNotFound(name=name)
|
|
target = server.findtext('target')
|
|
lun = server.findtext('lun')
|
|
if target is None or lun is None:
|
|
raise exception.ZadaraInvalidAttachmentInfo(
|
|
name=name,
|
|
reason='target=%s, lun=%s' % (target, lun))
|
|
|
|
properties = {}
|
|
properties['target_discovered'] = False
|
|
properties['target_portal'] = '%s:%s' % (ctrl['ip'], '3260')
|
|
properties['target_iqn'] = target
|
|
properties['target_lun'] = lun
|
|
properties['volume_id'] = volume['id']
|
|
|
|
properties['auth_method'] = 'CHAP'
|
|
properties['auth_username'] = ctrl['chap_user']
|
|
properties['auth_password'] = ctrl['chap_passwd']
|
|
|
|
LOG.debug('Attach properties: %(properties)s',
|
|
{'properties': properties})
|
|
return {'driver_volume_type': 'iscsi',
|
|
'data': properties}
|
|
|
|
def terminate_connection(self, volume, connector, **kwargs):
|
|
"""Detach volume from the initiator."""
|
|
# Get server name for IQN
|
|
initiator_name = connector['initiator']
|
|
vpsa_srv = self._get_server_name(initiator_name)
|
|
if not vpsa_srv:
|
|
raise exception.ZadaraServerNotFound(name=initiator_name)
|
|
|
|
# Get volume name
|
|
name = self.configuration.zadara_vol_name_template % volume['name']
|
|
vpsa_vol = self._get_vpsa_volume_name(name)
|
|
if not vpsa_vol:
|
|
raise exception.VolumeNotFound(volume_id=name)
|
|
|
|
# Detach volume from server
|
|
self.vpsa.send_cmd('detach_volume',
|
|
vpsa_srv=vpsa_srv,
|
|
vpsa_vol=vpsa_vol)
|
|
|
|
def get_volume_stats(self, refresh=False):
|
|
"""Get volume stats.
|
|
If 'refresh' is True, run update the stats first.
|
|
"""
|
|
if refresh:
|
|
self._update_volume_stats()
|
|
|
|
return self._stats
|
|
|
|
def _update_volume_stats(self):
|
|
"""Retrieve stats info from volume group."""
|
|
|
|
LOG.debug("Updating volume stats")
|
|
data = {}
|
|
|
|
backend_name = self.configuration.safe_get('volume_backend_name')
|
|
data["volume_backend_name"] = backend_name or self.__class__.__name__
|
|
data["vendor_name"] = 'Zadara Storage'
|
|
data["driver_version"] = self.VERSION
|
|
data["storage_protocol"] = 'iSCSI'
|
|
data['reserved_percentage'] = self.configuration.reserved_percentage
|
|
data['QoS_support'] = False
|
|
|
|
(total, free) = self._get_pool_capacity(self.configuration.
|
|
zadara_vpsa_poolname)
|
|
data['total_capacity_gb'] = total
|
|
data['free_capacity_gb'] = free
|
|
|
|
self._stats = data
|