OpenStack Block Storage (Cinder)
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# 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.
"""
Handles all requests related to user facing messages.
"""
import datetime
from oslo_config import cfg
from oslo_log import log as logging
from oslo_utils import timeutils
from cinder.db import base
from cinder.message import message_field
messages_opts = [
cfg.IntOpt('message_ttl', default=2592000,
help='message minimum life in seconds.'),
cfg.IntOpt('message_reap_interval', default=86400,
help='interval between periodic task runs to clean expired '
'messages in seconds.')
]
CONF = cfg.CONF
CONF.register_opts(messages_opts)
LOG = logging.getLogger(__name__)
class API(base.Base):
"""API for handling user messages.
Cinder Messages describe the outcome of a user action using predefined
fields that are members of objects defined in the
cinder.message.message_field package. They are intended to be exposed to
end users. Their primary purpose is to provide end users with a means of
discovering what went wrong when an asynchronous action in the Volume REST
API (for which they've already received a 2xx response) fails.
Messages contain an 'expires_at' field based on the creation time plus the
value of the 'message_ttl' configuration option. They are periodically
reaped by a task of the SchedulerManager class whose periodicity is given
by the 'message_reap_interval' configuration option.
"""
def create(self, context, action,
resource_type=message_field.Resource.VOLUME,
resource_uuid=None, exception=None, detail=None, level="ERROR"):
"""Create a message record with the specified information.
:param context: current context object
:param action:
a message_field.Action field describing what was taking place
when this message was created
:param resource_type:
a message_field.Resource field describing the resource this
message applies to. Default is message_field.Resource.VOLUME
:param resource_uuid:
the resource ID if this message applies to an existing resource.
Default is None
:param exception:
if an exception has occurred, you can pass it in and it will be
translated into an appropriate message detail ID (possibly
message_field.Detail.UNKNOWN_ERROR). The message
in the exception itself is ignored in order not to expose
sensitive information to end users. Default is None
:param detail:
a message_field.Detail field describing the event the message
is about. Default is None, in which case
message_field.Detail.UNKNOWN_ERROR will be used for the message
unless an exception in the message_field.EXCEPTION_DETAIL_MAPPINGS
is passed; in that case the message_field.Detail field that's
mapped to the exception is used.
:param level:
a string describing the severity of the message. Suggested
values are 'INFO', 'ERROR', 'WARNING'. Default is 'ERROR'.
"""
LOG.info("Creating message record for request_id = %s",
context.request_id)
# Updates expiry time for message as per message_ttl config.
expires_at = (timeutils.utcnow() + datetime.timedelta(
seconds=CONF.message_ttl))
detail_id = message_field.translate_detail_id(exception, detail)
message_record = {'project_id': context.project_id,
'request_id': context.request_id,
'resource_type': resource_type,
'resource_uuid': resource_uuid,
'action_id': action[0] if action else '',
'message_level': level,
'event_id': "VOLUME_%s_%s_%s" % (resource_type,
action[0],
detail_id),
'detail_id': detail_id,
'expires_at': expires_at}
try:
self.db.message_create(context, message_record)
except Exception:
LOG.exception("Failed to create message record "
"for request_id %s", context.request_id)
def get(self, context, id):
"""Return message with the specified id."""
return self.db.message_get(context, id)
def get_all(self, context, filters=None, marker=None,
limit=None, offset=None, sort_keys=None,
sort_dirs=None):
"""Return all messages for the given context."""
filters = filters or {}
messages = self.db.message_get_all(context, filters=filters,
marker=marker, limit=limit,
offset=offset, sort_keys=sort_keys,
sort_dirs=sort_dirs)
return messages
def delete(self, context, id):
"""Delete message with the specified id."""
ctx = context.elevated()
return self.db.message_destroy(ctx, id)
def cleanup_expired_messages(self, context):
ctx = context.elevated()
count = self.db.cleanup_expired_messages(ctx)
LOG.info("Deleted %s expired messages.", count)