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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.
from nova.db import api as db
from nova.objects import base
from nova.objects import fields
@base.NovaObjectRegistry.register
class VolumeUsage(base.NovaPersistentObject, base.NovaObject):
# Version 1.0: Initial version
VERSION = '1.0'
fields = {
'id': fields.IntegerField(read_only=True),
'volume_id': fields.UUIDField(),
'instance_uuid': fields.UUIDField(nullable=True),
'project_id': fields.StringField(nullable=True),
'user_id': fields.StringField(nullable=True),
'availability_zone': fields.StringField(nullable=True),
'tot_last_refreshed': fields.DateTimeField(nullable=True,
read_only=True),
'tot_reads': fields.IntegerField(read_only=True),
'tot_read_bytes': fields.IntegerField(read_only=True),
'tot_writes': fields.IntegerField(read_only=True),
'tot_write_bytes': fields.IntegerField(read_only=True),
'curr_last_refreshed': fields.DateTimeField(nullable=True,
read_only=True),
'curr_reads': fields.IntegerField(),
'curr_read_bytes': fields.IntegerField(),
'curr_writes': fields.IntegerField(),
'curr_write_bytes': fields.IntegerField()
}
@property
def last_refreshed(self):
if self.tot_last_refreshed and self.curr_last_refreshed:
return max(self.tot_last_refreshed, self.curr_last_refreshed)
elif self.tot_last_refreshed:
return self.tot_last_refreshed
else:
# curr_last_refreshed must be set
return self.curr_last_refreshed
@property
def reads(self):
return self.tot_reads + self.curr_reads
@property
def read_bytes(self):
return self.tot_read_bytes + self.curr_read_bytes
@property
def writes(self):
return self.tot_writes + self.curr_writes
@property
def write_bytes(self):
return self.tot_write_bytes + self.curr_write_bytes
@staticmethod
def _from_db_object(context, vol_usage, db_vol_usage):
for field in vol_usage.fields:
setattr(vol_usage, field, db_vol_usage[field])
vol_usage._context = context
vol_usage.obj_reset_changes()
return vol_usage
@base.remotable
def save(self, update_totals=False):
db_vol_usage = db.vol_usage_update(
self._context, self.volume_id, self.curr_reads,
self.curr_read_bytes, self.curr_writes, self.curr_write_bytes,
self.instance_uuid, self.project_id, self.user_id,
self.availability_zone, update_totals=update_totals)
self._from_db_object(self._context, self, db_vol_usage)
def to_dict(self):
return {
'volume_id': self.volume_id,
'tenant_id': self.project_id,
'user_id': self.user_id,
'availability_zone': self.availability_zone,
'instance_id': self.instance_uuid,
'last_refreshed': str(
self.last_refreshed) if self.last_refreshed else '',
'reads': self.reads,
'read_bytes': self.read_bytes,
'writes': self.writes,
'write_bytes': self.write_bytes
}
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