219 lines
8.5 KiB
Python
219 lines
8.5 KiB
Python
# Copyright (c) 2015 Hitachi Data Systems.
|
|
# All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
"""Helper class for Share Migration."""
|
|
|
|
import time
|
|
|
|
from oslo_config import cfg
|
|
from oslo_log import log
|
|
|
|
from manila.common import constants
|
|
from manila import exception
|
|
from manila.i18n import _, _LW
|
|
from manila.share import api as share_api
|
|
import manila.utils as utils
|
|
|
|
|
|
LOG = log.getLogger(__name__)
|
|
|
|
migration_opts = [
|
|
cfg.IntOpt(
|
|
'migration_wait_access_rules_timeout',
|
|
default=180,
|
|
help="Time to wait for access rules to be allowed/denied on backends "
|
|
"when migrating shares using generic approach (seconds)."),
|
|
cfg.IntOpt(
|
|
'migration_create_delete_share_timeout',
|
|
default=300,
|
|
help='Timeout for creating and deleting share instances '
|
|
'when performing share migration (seconds).'),
|
|
]
|
|
|
|
CONF = cfg.CONF
|
|
CONF.register_opts(migration_opts)
|
|
|
|
|
|
class ShareMigrationHelper(object):
|
|
|
|
def __init__(self, context, db, share):
|
|
|
|
self.db = db
|
|
self.share = share
|
|
self.context = context
|
|
self.api = share_api.API()
|
|
|
|
self.migration_create_delete_share_timeout = (
|
|
CONF.migration_create_delete_share_timeout)
|
|
self.migration_wait_access_rules_timeout = (
|
|
CONF.migration_wait_access_rules_timeout)
|
|
|
|
def delete_instance_and_wait(self, share_instance):
|
|
|
|
self.api.delete_instance(self.context, share_instance, True)
|
|
|
|
# Wait for deletion.
|
|
starttime = time.time()
|
|
deadline = starttime + self.migration_create_delete_share_timeout
|
|
tries = 0
|
|
instance = "Something not None"
|
|
while instance is not None:
|
|
try:
|
|
instance = self.db.share_instance_get(self.context,
|
|
share_instance['id'])
|
|
tries += 1
|
|
now = time.time()
|
|
if now > deadline:
|
|
msg = _("Timeout trying to delete instance "
|
|
"%s") % share_instance['id']
|
|
raise exception.ShareMigrationFailed(reason=msg)
|
|
except exception.NotFound:
|
|
instance = None
|
|
else:
|
|
time.sleep(tries ** 2)
|
|
|
|
def create_instance_and_wait(self, share, dest_host, new_share_network_id,
|
|
new_az_id, new_share_type_id):
|
|
|
|
new_share_instance = self.api.create_instance(
|
|
self.context, share, new_share_network_id, dest_host,
|
|
new_az_id, share_type_id=new_share_type_id)
|
|
|
|
# Wait for new_share_instance to become ready
|
|
starttime = time.time()
|
|
deadline = starttime + self.migration_create_delete_share_timeout
|
|
new_share_instance = self.db.share_instance_get(
|
|
self.context, new_share_instance['id'], with_share_data=True)
|
|
tries = 0
|
|
while new_share_instance['status'] != constants.STATUS_AVAILABLE:
|
|
tries += 1
|
|
now = time.time()
|
|
if new_share_instance['status'] == constants.STATUS_ERROR:
|
|
msg = _("Failed to create new share instance"
|
|
" (from %(share_id)s) on "
|
|
"destination host %(host_name)s") % {
|
|
'share_id': share['id'], 'host_name': dest_host}
|
|
self.cleanup_new_instance(new_share_instance)
|
|
raise exception.ShareMigrationFailed(reason=msg)
|
|
elif now > deadline:
|
|
msg = _("Timeout creating new share instance "
|
|
"(from %(share_id)s) on "
|
|
"destination host %(host_name)s") % {
|
|
'share_id': share['id'], 'host_name': dest_host}
|
|
self.cleanup_new_instance(new_share_instance)
|
|
raise exception.ShareMigrationFailed(reason=msg)
|
|
else:
|
|
time.sleep(tries ** 2)
|
|
new_share_instance = self.db.share_instance_get(
|
|
self.context, new_share_instance['id'], with_share_data=True)
|
|
|
|
return new_share_instance
|
|
|
|
# NOTE(ganso): Cleanup methods do not throw exceptions, since the
|
|
# exceptions that should be thrown are the ones that call the cleanup
|
|
|
|
def cleanup_new_instance(self, new_instance):
|
|
|
|
try:
|
|
self.delete_instance_and_wait(new_instance)
|
|
except Exception:
|
|
LOG.warning(_LW("Failed to cleanup new instance during generic"
|
|
" migration for share %s."), self.share['id'])
|
|
|
|
def cleanup_access_rules(self, share_instance, share_server, driver):
|
|
try:
|
|
self.revert_access_rules(share_instance, share_server, driver)
|
|
except Exception:
|
|
LOG.warning(_LW("Failed to cleanup access rules during generic"
|
|
" migration for share %s."), self.share['id'])
|
|
|
|
def change_to_read_only(self, share_instance, share_server,
|
|
readonly_support, driver):
|
|
|
|
# NOTE(ganso): If the share does not allow readonly mode we
|
|
# should remove all access rules and prevent any access
|
|
|
|
rules = self.db.share_access_get_all_for_instance(
|
|
self.context, share_instance['id'])
|
|
|
|
if len(rules) > 0:
|
|
|
|
if readonly_support:
|
|
|
|
LOG.debug("Changing all of share %s access rules "
|
|
"to read-only.", self.share['id'])
|
|
|
|
for rule in rules:
|
|
rule['access_level'] = constants.ACCESS_LEVEL_RO
|
|
|
|
driver.update_access(self.context, share_instance, rules,
|
|
add_rules=[], delete_rules=[],
|
|
share_server=share_server)
|
|
else:
|
|
|
|
LOG.debug("Removing all access rules for migration of "
|
|
"share %s." % self.share['id'])
|
|
|
|
driver.update_access(self.context, share_instance, [],
|
|
add_rules=[], delete_rules=rules,
|
|
share_server=share_server)
|
|
|
|
def revert_access_rules(self, share_instance, share_server, driver):
|
|
|
|
rules = self.db.share_access_get_all_for_instance(
|
|
self.context, share_instance['id'])
|
|
|
|
if len(rules) > 0:
|
|
LOG.debug("Restoring all of share %s access rules according to "
|
|
"DB.", self.share['id'])
|
|
|
|
driver.update_access(self.context, share_instance, rules,
|
|
add_rules=[], delete_rules=[],
|
|
share_server=share_server)
|
|
|
|
def apply_new_access_rules(self, new_share_instance):
|
|
|
|
self.db.share_instance_access_copy(self.context, self.share['id'],
|
|
new_share_instance['id'])
|
|
|
|
rules = self.db.share_access_get_all_for_instance(
|
|
self.context, new_share_instance['id'])
|
|
|
|
if len(rules) > 0:
|
|
LOG.debug("Restoring all of share %s access rules according to "
|
|
"DB.", self.share['id'])
|
|
|
|
# refresh share instance
|
|
new_share_instance = self.db.share_instance_get(
|
|
self.context, new_share_instance['id'], with_share_data=True)
|
|
|
|
self.api.allow_access_to_instance(self.context, new_share_instance,
|
|
rules)
|
|
utils.wait_for_access_update(
|
|
self.context, self.db, new_share_instance,
|
|
self.migration_wait_access_rules_timeout)
|
|
|
|
@utils.retry(exception.ShareServerNotReady, retries=8)
|
|
def wait_for_share_server(self, share_server_id):
|
|
share_server = self.db.share_server_get(self.context, share_server_id)
|
|
if share_server['status'] == constants.STATUS_ERROR:
|
|
raise exception.ShareServerNotCreated(
|
|
share_server_id=share_server_id)
|
|
elif share_server['status'] == constants.STATUS_ACTIVE:
|
|
return share_server
|
|
else:
|
|
raise exception.ShareServerNotReady(
|
|
share_server_id=share_server_id, time=511,
|
|
state=constants.STATUS_AVAILABLE)
|