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[OpenStack Infra <1559072@xxxxxxxxxxxxxxxxxx>]

** Changed in: python-cinderclient
       Status: Invalid => In Progress

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https://bugs.launchpad.net/bugs/1559072

Title:
  [SRU] exceptions.from_response with webob 1.6.0 results in
  "AttributeError: 'unicode' object has no attribute 'get'"

Status in networking-midonet:
  Fix Released
Status in python-cinderclient:
  In Progress
Status in python-novaclient:
  Fix Released
Status in python-openstackclient:
  Invalid
Status in python-novaclient package in Ubuntu:
  Fix Released
Status in python-novaclient source package in Xenial:
  Fix Released
Status in python-novaclient source package in Yakkety:
  Fix Released

Bug description:
  [Impact] [Testcase]
  Running on Ubuntu 14.04.
  After installing nova from source in either the Liberty release or Mitaka, with WebOb 1.6.0, running any nova command generated this error:
  root@openstack-ubu-controller:~# nova service-list
  ERROR (AttributeError): 'unicode' object has no attribute 'get'

  The equivalent openstack commands work correctly. After downgrading
  WebOb to 1.5.1 AND restarting the nova-api service everything works.

  Detailed output from nova -debug service-list with the error:

  root@openstack-ubu-controller:~# nova --debug service-list
  DEBUG (extension:157) found extension EntryPoint.parse('v2token = keystoneauth1.loading._plugins.identity.v2:Token')
  DEBUG (extension:157) found extension EntryPoint.parse('admin_token = keystoneauth1.loading._plugins.admin_token:AdminToken')
  DEBUG (extension:157) found extension EntryPoint.parse('v3oidcauthcode = keystoneauth1.loading._plugins.identity.v3:OpenIDConnectAuthorizationCode')
  DEBUG (extension:157) found extension EntryPoint.parse('v2password = keystoneauth1.loading._plugins.identity.v2:Password')
  DEBUG (extension:157) found extension EntryPoint.parse('v3password = keystoneauth1.loading._plugins.identity.v3:Password')
  DEBUG (extension:157) found extension EntryPoint.parse('v3oidcpassword = keystoneauth1.loading._plugins.identity.v3:OpenIDConnectPassword')
  DEBUG (extension:157) found extension EntryPoint.parse('token = keystoneauth1.loading._plugins.identity.generic:Token')
  DEBUG (extension:157) found extension EntryPoint.parse('v3token = keystoneauth1.loading._plugins.identity.v3:Token')
  DEBUG (extension:157) found extension EntryPoint.parse('password = keystoneauth1.loading._plugins.identity.generic:Password')
  DEBUG (session:248) REQ: curl -g -i -X GET http://10.0.1.3:5000/v2.0 -H "Accept: application/json" -H "User-Agent: keystoneauth1/2.3.0 python-requests/2.9.1 CPython/2.7.6"
  INFO (connectionpool:207) Starting new HTTP connection (1): 10.0.1.3
  DEBUG (connectionpool:387) "GET /v2.0 HTTP/1.1" 200 334
  DEBUG (session:277) RESP: [200] Content-Length: 334 Vary: X-Auth-Token Keep-Alive: timeout=5, max=100 Server: Apache/2.4.7 (Ubuntu) Connection: Keep-Alive Date: Fri, 18 Mar 2016 12:41:58 GMT Content-Type: application/json x-openstack-request-id: req-a0c68cd5-ea29-4391-942f-130cc69d15f8
  RESP BODY: {"version": {"status": "stable", "updated": "2014-04-17T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.identity-v2.0+json"}], "id": "v2.0", "links": [{"href": "http://10.0.1.3:5000/v2.0/";, "rel": "self"}, {"href": "http://docs.openstack.org/";, "type": "text/html", "rel": "describedby"}]}}

  DEBUG (v2:63) Making authentication request to http://10.0.1.3:5000/v2.0/tokens
  DEBUG (connectionpool:387) "POST /v2.0/tokens HTTP/1.1" 200 2465
  DEBUG (session:248) REQ: curl -g -i -X GET http://10.0.1.3:8774/v1.1/b77d640e127e488fb42a7c0716ba53a5 -H "User-Agent: python-novaclient" -H "Accept: application/json" -H "X-Auth-Token: {SHA1}381893576ad46c62b587f4963d769b89441b919a"
  INFO (connectionpool:207) Starting new HTTP connection (1): 10.0.1.3
  DEBUG (connectionpool:387) "GET /v1.1/b77d640e127e488fb42a7c0716ba53a5 HTTP/1.1" 404 112
  DEBUG (session:277) RESP: [404] Date: Fri, 18 Mar 2016 12:41:59 GMT Connection: keep-alive Content-Type: application/json; charset=UTF-8 Content-Length: 112 X-Compute-Request-Id: req-f10a2016-9a88-48fd-af1d-5f800fc9e11a
  RESP BODY: {"message": "The resource could not be found.<br /><br />\n\n\n", "code": "404 Not Found", "title": "Not Found"}

  DEBUG (shell:894) 'unicode' object has no attribute 'get'
  Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/novaclient/shell.py", line 892, in main
      OpenStackComputeShell().main(argv)
    File "/usr/local/lib/python2.7/dist-packages/novaclient/shell.py", line 726, in main
      api_version = api_versions.discover_version(self.cs, api_version)
    File "/usr/local/lib/python2.7/dist-packages/novaclient/api_versions.py", line 267, in discover_version
      client)
    File "/usr/local/lib/python2.7/dist-packages/novaclient/api_versions.py", line 248, in _get_server_version_range
      version = client.versions.get_current()
    File "/usr/local/lib/python2.7/dist-packages/novaclient/v2/versions.py", line 83, in get_current
      return self._get_current()
    File "/usr/local/lib/python2.7/dist-packages/novaclient/v2/versions.py", line 57, in _get_current
      return self._get(url, "version")
    File "/usr/local/lib/python2.7/dist-packages/novaclient/base.py", line 297, in _get
      _resp, body = self.api.client.get(url)
    File "/usr/local/lib/python2.7/dist-packages/keystoneauth1/adapter.py", line 173, in get
      return self.request(url, 'GET', **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/novaclient/client.py", line 92, in request
      raise exceptions.from_response(resp, body, url, method)
    File "/usr/local/lib/python2.7/dist-packages/novaclient/exceptions.py", line 274, in from_response
      message = error.get('message')
  AttributeError: 'unicode' object has no attribute 'get'
  ERROR (AttributeError): 'unicode' object has no attribute 'get'

  Since nova-api must be restarted for this to either take effect or go
  away (with the WebOb downgrade) this appears to be an issue with the
  nova-api process. The failing message from the api service is 112
  bytes long while the successful one (using downgraded WebOb) is 52
  bytes long.

  [Regression Potential]
  The regression potential is minimal. The patch is cherry-picked without change from stable/newton to stable/mitaka, and I've already tested it in a ppa.

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