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[Bug 1460875] [NEW] security group creation fails due to internal error if not specifying description

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Public bug reported:

If not specifying description parameter on "create a security group"
API, an internal error happens like the following:

$ curl [..] -X POST http://192.168.11.62:8774/v2/138c5606916a468abec3dd9371e66975/os-security-groups -H "Content-Type: application/json" -H "Accept: application/json" -d '{"security_group": {"name": "test"}}'
HTTP/1.1 500 Internal Server Error
Content-Length: 128
Content-Type: application/json; charset=UTF-8
X-Compute-Request-Id: req-1fbc1833-d87c-4f49-9b73-fc7c4bf894a6
Date: Tue, 02 Jun 2015 00:59:35 GMT

{"computeFault": {"message": "The server has either erred or is incapable of performing the requested operation.", "code": 500}}
$

nova-api.log is here:

2015-06-02 00:58:25.817 TRACE nova.api.openstack     action_result = self.dispatch(meth, request, action_args)
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 911, in dispatch
2015-06-02 00:58:25.817 TRACE nova.api.openstack     return method(req=request, **action_args)
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/compute/contrib/security_groups.py", line 204, in create
2015-06-02 00:58:25.817 TRACE nova.api.openstack     context, group_name, group_description)
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/opt/stack/nova/nova/network/security_group/neutron_driver.py", line 54, in create_security_group
2015-06-02 00:58:25.817 TRACE nova.api.openstack     body).get('security_group')
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 102, in with_params
2015-06-02 00:58:25.817 TRACE nova.api.openstack     ret = self.function(instance, *args, **kwargs)
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 716, in create_security_group
2015-06-02 00:58:25.817 TRACE nova.api.openstack     return self.post(self.security_groups_path, body=body)
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 298, in post
2015-06-02 00:58:25.817 TRACE nova.api.openstack     headers=headers, params=params)
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 211, in do_request
2015-06-02 00:58:25.817 TRACE nova.api.openstack     self._handle_fault_response(status_code, replybody)
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 185, in _handle_fault_response
2015-06-02 00:58:25.817 TRACE nova.api.openstack     exception_handler_v20(status_code, des_error_body)
2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 70, in exception_handler_v20
2015-06-02 00:58:25.817 TRACE nova.api.openstack     status_code=status_code)
2015-06-02 00:58:25.817 TRACE nova.api.openstack BadRequest: Invalid input for description. Reason: 'None' is not a valid string.
2015-06-02 00:58:25.817 TRACE nova.api.openstack

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1460875

Title:
  security group creation fails due to internal error if not specifying
  description

Status in OpenStack Compute (Nova):
  New

Bug description:
  If not specifying description parameter on "create a security group"
  API, an internal error happens like the following:

  $ curl [..] -X POST http://192.168.11.62:8774/v2/138c5606916a468abec3dd9371e66975/os-security-groups -H "Content-Type: application/json" -H "Accept: application/json" -d '{"security_group": {"name": "test"}}'
  HTTP/1.1 500 Internal Server Error
  Content-Length: 128
  Content-Type: application/json; charset=UTF-8
  X-Compute-Request-Id: req-1fbc1833-d87c-4f49-9b73-fc7c4bf894a6
  Date: Tue, 02 Jun 2015 00:59:35 GMT

  {"computeFault": {"message": "The server has either erred or is incapable of performing the requested operation.", "code": 500}}
  $

  nova-api.log is here:

  2015-06-02 00:58:25.817 TRACE nova.api.openstack     action_result = self.dispatch(meth, request, action_args)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 911, in dispatch
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     return method(req=request, **action_args)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/compute/contrib/security_groups.py", line 204, in create
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     context, group_name, group_description)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/opt/stack/nova/nova/network/security_group/neutron_driver.py", line 54, in create_security_group
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     body).get('security_group')
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 102, in with_params
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     ret = self.function(instance, *args, **kwargs)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 716, in create_security_group
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     return self.post(self.security_groups_path, body=body)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 298, in post
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     headers=headers, params=params)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 211, in do_request
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     self._handle_fault_response(status_code, replybody)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 185, in _handle_fault_response
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     exception_handler_v20(status_code, des_error_body)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 70, in exception_handler_v20
  2015-06-02 00:58:25.817 TRACE nova.api.openstack     status_code=status_code)
  2015-06-02 00:58:25.817 TRACE nova.api.openstack BadRequest: Invalid input for description. Reason: 'None' is not a valid string.
  2015-06-02 00:58:25.817 TRACE nova.api.openstack

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