399 lines
13 KiB
Python
399 lines
13 KiB
Python
# Copyright (c) 2016 IBM Corporation
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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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import functools
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import gettext
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import inspect
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import platform
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import six
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from oslo_log import log as logging
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from oslo_utils import timeutils
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from cinder.i18n import _
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from cinder import version
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import cinder.volume.drivers.ibm.ibm_storage as storage
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from cinder.volume.drivers.ibm.ibm_storage import strings
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LOG = logging.getLogger(__name__)
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gettext.install('cinder')
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def get_total_seconds(td):
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return (td.microseconds + (td.seconds + td.days * 24 * 3600) * 1e6) / 1e6
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def logger(func):
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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frm = inspect.stack()[1]
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log = getattr(inspect.getmodule(frm[0]), 'LOG')
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log.debug("Enter %s()", func.__name__)
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log.debug("Args: %(args)s %(kwargs)s",
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{'args': args, 'kwargs': kwargs})
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result = func(*args, **kwargs)
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log.debug("Exit %s()", func.__name__)
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log.debug("Return: %s", result)
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return result
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return wrapper
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def _trace_time(fnc):
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@functools.wraps(fnc)
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def wrapper(self, *args, **kwargs):
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method = fnc.__name__
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start = timeutils.utcnow()
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LOG.debug("Entered '%(method)s' at %(when)s.",
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{'method': method, 'when': start})
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result = fnc(self, *args, **kwargs)
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current = timeutils.utcnow()
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delta = current - start
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LOG.debug(
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"Exited '%(method)s' at %(when)s, after %(seconds)f seconds.",
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{'method': method, 'when': start,
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'seconds': get_total_seconds(delta)})
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return result
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return wrapper
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class IBMStorageProxy(object):
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"""Base class for connecting to storage.
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Abstract Proxy between the XIV/DS8K Cinder Volume and Spectrum Accelerate
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Storage (e.g. XIV, Spectruam Accelerate, A9000, A9000R)
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"""
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prefix = storage.XIV_LOG_PREFIX
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def __init__(self, storage_info, logger, exception,
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driver=None, active_backend_id=None):
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"""Initialize Proxy."""
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self.storage_info = storage_info
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self.meta = dict()
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self.logger = logger
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self.meta['exception'] = exception
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self.meta['openstack_version'] = "cinder-%s" % version.version_string()
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self.meta['stat'] = None
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self.driver = driver
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if driver is not None:
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self.full_version = "%(title)s (v%(version)s)" % {
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'title': strings.TITLE,
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'version': driver.VERSION}
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else:
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self.full_version = strings.TITLE
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self.active_backend_id = active_backend_id
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self.targets = {}
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self._read_replication_devices()
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self.meta['bypass_connection_check'] = (
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self._get_safely_from_configuration(
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storage.FLAG_KEYS['bypass_connection_check'], False))
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@_trace_time
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def setup(self, context):
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"""Driver setup."""
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pass
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@_trace_time
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def create_volume(self, volume):
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"""Creates a volume."""
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pass
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@_trace_time
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def ensure_export(self, context, volume):
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ctxt = context.as_dict() if hasattr(context, 'as_dict') else "Empty"
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LOG.debug("ensure_export: %(volume)s context : %(ctxt)s",
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{'volume': volume['name'], 'ctxt': ctxt})
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return 1
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@_trace_time
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def create_export(self, context, volume):
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ctxt = context.as_dict() if hasattr(context, 'as_dict') else "Empty"
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LOG.debug("create_export: %(volume)s context : %(ctxt)s",
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{'volume': volume['name'], 'ctxt': ctxt})
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return {}
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@_trace_time
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def delete_volume(self, volume):
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"""Deletes a volume on the IBM Storage machine."""
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pass
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@_trace_time
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def remove_export(self, context, volume):
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"""Remove export.
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Disconnect a volume from an attached instance
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"""
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ctxt = context.as_dict() if hasattr(context, 'as_dict') else "Empty"
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LOG.debug("remove_export: %(volume)s context : %(ctxt)s",
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{'volume': volume['name'], 'ctxt': ctxt})
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@_trace_time
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def initialize_connection(self, volume, connector):
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"""Initialize connection.
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Maps the created volume to the cinder volume node,
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and returns the iSCSI/FC targets to be used in the instance
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"""
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pass
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@_trace_time
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def terminate_connection(self, volume, connector):
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"""Terminate connection."""
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pass
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@_trace_time
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def create_volume_from_snapshot(self, volume, snapshot):
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"""create volume from snapshot."""
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pass
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@_trace_time
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def create_snapshot(self, snapshot):
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"""create snapshot"""
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pass
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@_trace_time
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def delete_snapshot(self, snapshot):
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"""delete snapshot."""
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pass
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@_trace_time
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def get_volume_stats(self, refresh=False):
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"""get volume stats."""
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if self.meta['stat'] is None or refresh:
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self._update_stats()
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return self.meta['stat']
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@_trace_time
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def _update_stats(self):
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"""fetch and update stats."""
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pass
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@_trace_time
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def check_for_export(self, context, volume_id):
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pass
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@_trace_time
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def copy_volume_to_image(self, context, volume, image_service, image_id):
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"""Copy volume to image.
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Handled by ISCSiDriver
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"""
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LOG.info("The copy_volume_to_image feature is not implemented.")
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raise NotImplementedError()
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@_trace_time
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def create_cloned_volume(self, volume, src_vref):
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"""Create cloned volume."""
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pass
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@_trace_time
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def volume_exists(self, volume):
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"""Checks if a volume exists on xiv."""
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pass
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@_trace_time
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def validate_connection(self):
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"""Validates ibm_storage connection info."""
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pass
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@_trace_time
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def retype(self, ctxt, volume, new_type, diff, host):
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"""Convert the volume to be of the new type."""
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pass
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@_trace_time
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def _get_bunch_from_host(
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self, connector, host_id=0, host_name=None, chap=None):
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"""Get's a Bunch describing a host"""
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if not host_name:
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LOG.debug("Connector %(conn)s", {'conn': connector})
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current_host_name = host_name or storage.get_host_or_create_from_iqn(
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connector)
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initiator = connector.get('initiator', None)
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wwpns = connector.get("wwpns", [])
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if len(wwpns) == 0 and "wwnns" in connector:
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wwpns = connector.get("wwns", [])
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return {'name': current_host_name,
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'initiator': initiator,
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'id': host_id,
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'wwpns': wwpns,
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'chap': chap}
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@_trace_time
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def _get_os_type(self):
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"""Gets a string representation of the current os"""
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dist = platform.dist()
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return "%s-%s-%s" % (dist[0], dist[1], platform.processor())
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def _log(self, level, message, **kwargs):
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"""Wrapper around the logger"""
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to_log = _(self.prefix + message) # NOQA
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if len(kwargs) > 0:
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to_log = to_log % kwargs
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getattr(self.logger, level)(to_log)
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def _get_exception(self):
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"""Get's Cinder exception"""
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return self.meta['exception'].CinderException
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def _get_code_and_status_or_message(self, exception):
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"""Returns status message
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returns a string made out of code and status if present, else message
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"""
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if (getattr(exception, "code", None) is not None and
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getattr(exception, "status", None) is not None):
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return "Status: '%s', Code: %s" % (
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exception.status, exception.code)
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return six.text_type(exception)
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def _get_driver_super(self):
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"""Gets the IBM Storage Drivers super class
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returns driver super class
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"""
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return super(self.driver.__class__, self.driver)
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def _get_connection_type(self):
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"""Get Connection Type(iscsi|fibre_channel)
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:returns: iscsi|fibre_channel
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"""
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return self._get_safely_from_configuration(
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storage.CONF_KEYS['connection_type'],
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default=storage.XIV_CONNECTION_TYPE_ISCSI)
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def _is_iscsi(self):
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"""Checks if connection type is iscsi"""
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connection_type = self._get_connection_type()
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return connection_type == storage.XIV_CONNECTION_TYPE_ISCSI
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def _get_management_ips(self):
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"""Gets the management IP addresses from conf"""
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return self._get_safely_from_configuration(
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storage.CONF_KEYS['management_ips'],
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default='')
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def _get_chap_type(self):
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"""Get CHAP Type(disabled|enabled)
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:returns: disabled|enabled
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"""
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LOG.debug("_get_chap_type chap: %(chap)s",
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{'chap': storage.CONF_KEYS['chap']})
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return self._get_safely_from_configuration(
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storage.CONF_KEYS['chap'],
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default=storage.CHAP_NONE)
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def _get_safely_from_configuration(self, key, default=None):
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"""Get value of key from configuration
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Get's a key from the backend configuration if available.
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If not available returns default value
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"""
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if not self.driver:
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LOG.debug("self.driver is missing")
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return default
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config_value = self.driver.configuration.safe_get(key)
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if not config_value:
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LOG.debug("missing key %(key)s ", {'key': key})
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return default
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return config_value
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# Backend_id values:
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# - The primary backend_id is marked 'default'
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# - The secondary backend_ids are the values of the targets.
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# - In most cases the given value is one of the above, but in some cases
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# it can be None. For example in failover_host, the value None means
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# that the function should select a target by itself (consider multiple
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# targets)
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def _get_primary_backend_id(self):
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return strings.PRIMARY_BACKEND_ID
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def _get_secondary_backend_id(self):
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return self._get_target()
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def _get_active_backend_id(self):
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if self.active_backend_id == strings.PRIMARY_BACKEND_ID:
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return self._get_primary_backend_id()
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else:
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return self._get_secondary_backend_id()
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def _get_inactive_backend_id(self):
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if self.active_backend_id != strings.PRIMARY_BACKEND_ID:
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return self._get_primary_backend_id()
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else:
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return self._get_secondary_backend_id()
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def _get_target_params(self, target):
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if not self.targets:
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LOG.debug("No targets available")
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return None
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try:
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params = self.targets[target]
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return params
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except Exception:
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LOG.debug("No target called '%(target)s'", {'target': target})
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return None
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def _get_target(self):
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"""returns an arbitrary target if available"""
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if not self.targets:
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return None
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try:
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target = self.targets.iterkeys().next()
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return target
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except Exception:
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return None
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@_trace_time
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def _read_replication_devices(self):
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"""Read replication devices from configuration
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Several replication devices are permitted.
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If an entry already exists an error is assumed.
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The format is:
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replication_device = backend_id:vendor-id-1,unique_key:val....
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"""
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if not self.driver:
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return
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replication_devices = self._get_safely_from_configuration(
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'replication_device', default={})
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if not replication_devices:
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LOG.debug('No replication devices were found')
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for dev in replication_devices:
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LOG.debug('Replication device found: %(dev)s', {'dev': dev})
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backend_id = dev.get('backend_id', None)
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if backend_id is None:
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LOG.error("Replication is missing backend_id: %(dev)s",
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{'dev': dev})
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elif self.targets.get(backend_id, None):
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LOG.error("Multiple entries for replication %(dev)s",
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{'dev': dev})
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else:
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self.targets[backend_id] = {}
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device = self.targets[backend_id]
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for k, v in dev.iteritems():
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if k != 'backend_id':
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device[k] = v
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