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[Bug 1175414] Re: Circular reference serializing InstanceTypeNotFound

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 29 May 2013 10:22:06 -0000
Reply-to: Bug 1175414 <1175414@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => havana-1

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https://bugs.launchpad.net/bugs/1175414

Title:
  Circular reference serializing InstanceTypeNotFound

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  During server creation, if an instance type is disabled an
  InstanceTypeNotFound is raised.  This is caught in
  nova/api/openstack/compute/servers.py and the exception is stuffed
  into a HTTPBadRequest.  Because the exception is put in there and not
  the exception message, when the wsgi layer tries to serialize it it
  results in:

  2013-05-02 01:24:20.157 DEBUG nova.api.openstack.wsgi [req-9e8649fa-902d-4edc-99ba-cf1f88291bac demo demo] Calling method <bound method Controller.create of <nova.api.openstack.compute.servers.Controller object at 0x3efb890>> from (pid=16849) _process_stack /opt/stack/nova/nova/api/openstack/wsgi.py:920
  2013-05-02 01:24:20.172 INFO nova.api.openstack.wsgi [req-9e8649fa-902d-4edc-99ba-cf1f88291bac demo demo] HTTP exception thrown: Instance type 2 could not be found.
  2013-05-02 01:24:20.172 DEBUG nova.api.openstack.wsgi [req-9e8649fa-902d-4edc-99ba-cf1f88291bac demo demo] Returning 400 to user: Instance type 2 could not be found. from (pid=16849) __call__ /opt/stack/nova/nova/api/openstack/wsgi.py:1173
  2013-05-02 01:24:20.172 ERROR nova.api.openstack [req-9e8649fa-902d-4edc-99ba-cf1f88291bac demo demo] Caught error: Circular reference detected
  2013-05-02 01:24:20.172 TRACE nova.api.openstack Traceback (most recent call last):
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/__init__.py", line 81, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return req.get_response(self.application)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1296, in send
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     application, catch_exc_info=False)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1260, in call_application
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     app_iter = application(self.environ, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return resp(environ, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/opt/stack/python-keystoneclient/keystoneclient/middleware/auth_token.py", line 451, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return self.app(env, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return resp(environ, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return resp(environ, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return resp(environ, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/routes/middleware.py", line 131, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     response = self.app(environ, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return resp(environ, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return resp(environ, start_response)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     resp = self.call_func(req, *args, **self.kwargs)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return self.func(req, *args, **kwargs)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 1195, in __call__
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     self.wrapped_exc.body = serializer.serialize(fault_data)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 321, in serialize
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return self.dispatch(data, action=action)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 186, in dispatch
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return action_method(*args, **kwargs)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 331, in default
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return jsonutils.dumps(data)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/opt/stack/nova/nova/openstack/common/jsonutils.py", line 149, in dumps
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return json.dumps(value, default=default, **kwargs)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/lib/python2.7/json/__init__.py", line 238, in dumps
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     **kw).encode(obj)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/lib/python2.7/json/encoder.py", line 201, in encode
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     chunks = self.iterencode(o, _one_shot=True)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack   File "/usr/lib/python2.7/json/encoder.py", line 264, in iterencode
  2013-05-02 01:24:20.172 TRACE nova.api.openstack     return _iterencode(o, 0)
  2013-05-02 01:24:20.172 TRACE nova.api.openstack ValueError: Circular reference detected
  2013-05-02 01:24:20.172 TRACE nova.api.openstack 

  
  The exception has a format_message() method for this, it just needs to be used.

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