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[Bug 1538896] [NEW] nova flavor-show <id> raises 500 error if flavor is deleted

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Public bug reported:

Reproducible on latest master.

Tried to show deleted flavor then it raises 500 error.

Steps to reproduce:

1. Create flavor
$ nova flavor-create m2.test 10 1200 12 8

2. Delete flavor
$ nova flavor-delete 10

3. Show deleted flavor
$ nova flavor-show 10

ERROR (ClientException): Unexpected API Error. Please report this at
http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'webob.exc.HTTPNotFound'> (HTTP 500) (Request-ID: req-
4f77f74c-2234-4beb-9875-157364bdd964)

Nova api logs:
---------------------

 from (pid=31454) _http_log_response /usr/local/lib/python2.7/dist-packages/keystoneauth1/session.py:254
2016-01-27 15:28:14.067 DEBUG nova.api.openstack.wsgi [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] Calling method '<bound method FlavorExtraSpecsController.index of <nova.api.openstack.compute.flavors_extraspecs.FlavorExtraSpecsController object at 0x7ff02f22cad0>>' from (pid=31454) _process_stack /opt/stack/nova/nova/api/openstack/wsgi.py:699
2016-01-27 15:28:14.082 ERROR nova.api.openstack.extensions [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] Unexpected exception in API method
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions Traceback (most recent call last):
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions   File "/opt/stack/nova/nova/api/openstack/extensions.py", line 478, in wrapped
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions     return f(*args, **kwargs)
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions   File "/opt/stack/nova/nova/api/openstack/compute/flavors_extraspecs.py", line 60, in index
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions     return self._get_extra_specs(context, flavor_id)
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions   File "/opt/stack/nova/nova/api/openstack/compute/flavors_extraspecs.py", line 39, in _get_extra_specs
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions     flavor = common.get_flavor(context, flavor_id)
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions   File "/opt/stack/nova/nova/api/openstack/common.py", line 543, in get_flavor
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions     raise exc.HTTPNotFound(explanation=error.format_message())
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions HTTPNotFound: Flavor 122 could not be found.
2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions
2016-01-27 15:28:14.085 INFO nova.api.openstack.wsgi [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'webob.exc.HTTPNotFound'>
2016-01-27 15:28:14.086 DEBUG nova.api.openstack.wsgi [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] Returning 500 to user: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'webob.exc.HTTPNotFound'> from (pid=31454) __call__ /opt/stack/nova/nova/api/openstack/wsgi.py:1070
2016-01-27 15:28:14.097 INFO nova.osapi_compute.wsgi.server [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] 10.69.4.177 "GET /v2.1/982e2fc081364cf889d959b27d4bd510/flavors/122/os-extra_specs HTTP/1.1" status: 500 len: 499 time: 0.1559708

** Affects: nova
     Importance: Undecided
     Assignee: Abhishek Kekane (abhishek-kekane)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Abhishek Kekane (abhishek-kekane)

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https://bugs.launchpad.net/bugs/1538896

Title:
  nova flavor-show <id> raises 500 error if flavor is deleted

Status in OpenStack Compute (nova):
  New

Bug description:
  Reproducible on latest master.

  Tried to show deleted flavor then it raises 500 error.

  Steps to reproduce:

  1. Create flavor
  $ nova flavor-create m2.test 10 1200 12 8

  2. Delete flavor
  $ nova flavor-delete 10

  3. Show deleted flavor
  $ nova flavor-show 10

  ERROR (ClientException): Unexpected API Error. Please report this at
  http://bugs.launchpad.net/nova/ and attach the Nova API log if
  possible. <class 'webob.exc.HTTPNotFound'> (HTTP 500) (Request-ID:
  req-4f77f74c-2234-4beb-9875-157364bdd964)

  Nova api logs:
  ---------------------

   from (pid=31454) _http_log_response /usr/local/lib/python2.7/dist-packages/keystoneauth1/session.py:254
  2016-01-27 15:28:14.067 DEBUG nova.api.openstack.wsgi [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] Calling method '<bound method FlavorExtraSpecsController.index of <nova.api.openstack.compute.flavors_extraspecs.FlavorExtraSpecsController object at 0x7ff02f22cad0>>' from (pid=31454) _process_stack /opt/stack/nova/nova/api/openstack/wsgi.py:699
  2016-01-27 15:28:14.082 ERROR nova.api.openstack.extensions [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] Unexpected exception in API method
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions Traceback (most recent call last):
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions   File "/opt/stack/nova/nova/api/openstack/extensions.py", line 478, in wrapped
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions     return f(*args, **kwargs)
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions   File "/opt/stack/nova/nova/api/openstack/compute/flavors_extraspecs.py", line 60, in index
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions     return self._get_extra_specs(context, flavor_id)
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions   File "/opt/stack/nova/nova/api/openstack/compute/flavors_extraspecs.py", line 39, in _get_extra_specs
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions     flavor = common.get_flavor(context, flavor_id)
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions   File "/opt/stack/nova/nova/api/openstack/common.py", line 543, in get_flavor
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions     raise exc.HTTPNotFound(explanation=error.format_message())
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions HTTPNotFound: Flavor 122 could not be found.
  2016-01-27 15:28:14.082 TRACE nova.api.openstack.extensions
  2016-01-27 15:28:14.085 INFO nova.api.openstack.wsgi [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <class 'webob.exc.HTTPNotFound'>
  2016-01-27 15:28:14.086 DEBUG nova.api.openstack.wsgi [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] Returning 500 to user: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <class 'webob.exc.HTTPNotFound'> from (pid=31454) __call__ /opt/stack/nova/nova/api/openstack/wsgi.py:1070
  2016-01-27 15:28:14.097 INFO nova.osapi_compute.wsgi.server [req-15b4f90e-332b-4e96-b839-8cd931605e42 admin demo] 10.69.4.177 "GET /v2.1/982e2fc081364cf889d959b27d4bd510/flavors/122/os-extra_specs HTTP/1.1" status: 500 len: 499 time: 0.1559708

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