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[Bug 1805790] [NEW] Failed to revert a volume based on a snapshot: "AttributeError: 'Snapshot' object has no attribute '_obj_metadata'"

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Public bug reported:

You can use the following steps to reproduce：
1 cinder create --name test6666 --metadata k=v 1
+--------------------------------+--------------------------------------+
| Property                       | Value                                |
+--------------------------------+--------------------------------------+
| attachments                    | []                                   |
| availability_zone              | nova                                 |
| bootable                       | false                                |
| consistencygroup_id            | None                                 |
| created_at                     | 2018-11-29T08:19:09.000000           |
| description                    | None                                 |
| encrypted                      | False                                |
| id                             | f86e8532-96a9-4917-851e-6e7cadddac08 |
| metadata                       | {u'k': u'v'}                         |
| migration_status               | None                                 |
| multiattach                    | False                                |
| name                           | test6666                             |
| os-vol-host-attr:host          | None                                 |
| os-vol-mig-status-attr:migstat | None                                 |
| os-vol-mig-status-attr:name_id | None                                 |
| os-vol-tenant-attr:tenant_id   | b7f73d2e3c1c4d799b7e39500b053510     |
| replication_status             | None                                 |
| size                           | 1                                    |
| snapshot_id                    | None                                 |
| source_volid                   | None                                 |
| status                         | creating                             |
| updated_at                     | None                                 |
| user_id                        | a1c8e36ec49c4fbfba04ecc85e0612d8     |
| volume_type                    | None                                 |
+--------------------------------+--------------------------------------+

2 cinder snapshot-create f86e8532-96a9-4917-851e-6e7cadddac08  --metadata k1=v1 --name snapshot_6666
+-------------+--------------------------------------+
| Property    | Value                                |
+-------------+--------------------------------------+
| created_at  | 2018-11-29T08:19:53.018179           |
| description | None                                 |
| id          | e05e0744-249d-4a90-9e71-01726e6b5116 |
| metadata    | {u'k1': u'v1'}                       |
| name        | snapshot_6666                        |
| size        | 1                                    |
| status      | creating                             |
| updated_at  | None                                 |
| volume_id   | f86e8532-96a9-4917-851e-6e7cadddac08 |
+-------------+--------------------------------------+

3 curl -g -i -X POST
http://IP:8776/v3/b7f73d2e3c1c4d799b7e39500b053510/volumes/f86e8532-96a9-4917
-851e-6e7cadddac08/action -H "Accept: application/json" -H "Content-
Type: application/json" -H "User-Agent: python-cinderclient" -H "X-Auth-
Token: $token" -H "OpenStack-API-Version: volume 3.40" -d '{"revert":
{"snapshot_id": "e05e0744-249d-4a90-9e71-01726e6b5116"}}'

Error log is as follows：
Exception during message handling: AttributeError: 'Snapshot' object has no attribute '_obj_metadata'
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 265, in dispatch
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 194, in _do_dispatch
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/manager.py", line 988, in revert_to_snapshot
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     "revert.end")
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/manager.py", line 2560, in _notify_about_snapshot_usage
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     extra_usage_info=extra_usage_info, host=self.host)
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/utils.py", line 1197, in wrapped
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/utils.py", line 201, in notify_about_snapshot_usage
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     usage_info = _usage_from_snapshot(snapshot, context, **extra_usage_info)
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/utils.py", line 184, in _usage_from_snapshot
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     'metadata': null_safe_str(snapshot.get('metadata')),
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/objects/base.py", line 242, in get
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     return getattr(self, key)
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 68, in getter
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     return getattr(self, attrname)
2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server AttributeError: 'Snapshot' object has no attribute '_obj_metadata'

** Affects: cinder
     Importance: Undecided
     Assignee: Leopard Ma (leopardma)
         Status: New

** Project changed: nova => cinder

** Changed in: cinder
     Assignee: (unassigned) => Leopard Ma (leopardma)

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https://bugs.launchpad.net/bugs/1805790

Title:
  Failed to revert a volume based on a snapshot: "AttributeError:
  'Snapshot' object has no attribute '_obj_metadata'"

Status in Cinder:
  New

Bug description:
  You can use the following steps to reproduce：
  1 cinder create --name test6666 --metadata k=v 1
  +--------------------------------+--------------------------------------+
  | Property                       | Value                                |
  +--------------------------------+--------------------------------------+
  | attachments                    | []                                   |
  | availability_zone              | nova                                 |
  | bootable                       | false                                |
  | consistencygroup_id            | None                                 |
  | created_at                     | 2018-11-29T08:19:09.000000           |
  | description                    | None                                 |
  | encrypted                      | False                                |
  | id                             | f86e8532-96a9-4917-851e-6e7cadddac08 |
  | metadata                       | {u'k': u'v'}                         |
  | migration_status               | None                                 |
  | multiattach                    | False                                |
  | name                           | test6666                             |
  | os-vol-host-attr:host          | None                                 |
  | os-vol-mig-status-attr:migstat | None                                 |
  | os-vol-mig-status-attr:name_id | None                                 |
  | os-vol-tenant-attr:tenant_id   | b7f73d2e3c1c4d799b7e39500b053510     |
  | replication_status             | None                                 |
  | size                           | 1                                    |
  | snapshot_id                    | None                                 |
  | source_volid                   | None                                 |
  | status                         | creating                             |
  | updated_at                     | None                                 |
  | user_id                        | a1c8e36ec49c4fbfba04ecc85e0612d8     |
  | volume_type                    | None                                 |
  +--------------------------------+--------------------------------------+

  2 cinder snapshot-create f86e8532-96a9-4917-851e-6e7cadddac08  --metadata k1=v1 --name snapshot_6666
  +-------------+--------------------------------------+
  | Property    | Value                                |
  +-------------+--------------------------------------+
  | created_at  | 2018-11-29T08:19:53.018179           |
  | description | None                                 |
  | id          | e05e0744-249d-4a90-9e71-01726e6b5116 |
  | metadata    | {u'k1': u'v1'}                       |
  | name        | snapshot_6666                        |
  | size        | 1                                    |
  | status      | creating                             |
  | updated_at  | None                                 |
  | volume_id   | f86e8532-96a9-4917-851e-6e7cadddac08 |
  +-------------+--------------------------------------+

  3 curl -g -i -X POST
  http://IP:8776/v3/b7f73d2e3c1c4d799b7e39500b053510/volumes/f86e8532-96a9-4917
  -851e-6e7cadddac08/action -H "Accept: application/json" -H "Content-
  Type: application/json" -H "User-Agent: python-cinderclient" -H "X
  -Auth-Token: $token" -H "OpenStack-API-Version: volume 3.40" -d
  '{"revert": {"snapshot_id": "e05e0744-249d-4a90-9e71-01726e6b5116"}}'

  Error log is as follows：
  Exception during message handling: AttributeError: 'Snapshot' object has no attribute '_obj_metadata'
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 265, in dispatch
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 194, in _do_dispatch
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/manager.py", line 988, in revert_to_snapshot
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     "revert.end")
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/manager.py", line 2560, in _notify_about_snapshot_usage
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     extra_usage_info=extra_usage_info, host=self.host)
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/utils.py", line 1197, in wrapped
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/utils.py", line 201, in notify_about_snapshot_usage
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     usage_info = _usage_from_snapshot(snapshot, context, **extra_usage_info)
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/utils.py", line 184, in _usage_from_snapshot
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     'metadata': null_safe_str(snapshot.get('metadata')),
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/objects/base.py", line 242, in get
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     return getattr(self, key)
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 68, in getter
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server     return getattr(self, attrname)
  2018-11-29 15:08:57.996 33 ERROR oslo_messaging.rpc.server AttributeError: 'Snapshot' object has no attribute '_obj_metadata'

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