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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

** Changed in: horizon
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1517652

Title:
  Cannot handle glanceclient CommunicationError in Horizon

Status in OpenStack Dashboard (Horizon):
  Fix Released

Bug description:
  When clicking on the "Launch instance" button, if glance client throws
  CommunicationError, although there is code  that tries to handle the
  exception, the UI still shows message "Danger: An error occurred.
  Please try again later.", not the error message from the exception
  handling code.

  The horizon log shows the following traceback when glance client
  throws a CommunicationError.

  2015-09-30 12:57:00,240 3549 ERROR django.request Internal Server Error: /horizon/project/instances/launch
  Traceback (most recent call last):
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 137, in get_response
      response = response.render()
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/response.py", line 105, in render
      self.content = self.rendered_content
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/response.py", line 82, in rendered_content
      content = template.render(context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/base.py", line 140, in render
      return self._render(context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/base.py", line 134, in _render
      return self.nodelist.render(context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/base.py", line 840, in render
      bit = self.render_node(node, context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/debug.py", line 78, in render_node
      return node.render(context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/defaulttags.py", line 504, in render
      six.iteritems(self.extra_context)])
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/base.py", line 585, in resolve
      obj = self.var.resolve(context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/base.py", line 735, in resolve
      value = self._resolve_lookup(context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/django/template/base.py", line 789, in _resolve_lookup
      current = current()
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../horizon/workflows/base.py", line 717, in get_entry_point
      step._verify_contributions(self.context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../horizon/workflows/base.py", line 392, in _verify_contributions
      field = self.action.fields.get(key, None)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../horizon/workflows/base.py", line 368, in action
      context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../openstack_dashboard/dashboards/project/instances/workflows/create_instance.py", line 147, in __init__
      request, context, *args, **kwargs)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../horizon/workflows/base.py", line 138, in __init__
      self._populate_choices(request, context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../horizon/workflows/base.py", line 151, in _populate_choices
      bound_field.choices = meth(request, context)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../openstack_dashboard/dashboards/project/instances/workflows/create_instance.py", line 446, in populate_instance_snapshot_id_choices
      self._images_cache)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../openstack_dashboard/dashboards/project/images/utils.py", line 44, in get_available_images
      _("Unable to retrieve public images."))
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../horizon/exceptions.py", line 364, in handle
      six.reraise(exc_type, exc_value, exc_traceback)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../openstack_dashboard/dashboards/project/images/utils.py", line 39, in get_available_images
      request, filters=public)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../openstack_dashboard/api/glance.py", line 104, in image_list_detailed
      images = list(images_iter)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../glanceclient/v1/images.py", line 249, in list
      for image in paginate(params, return_request_id):
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../glanceclient/v1/images.py", line 233, in paginate
      images, resp = self._list(url, "images")
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../glanceclient/v1/images.py", line 63, in _list
      resp, body = self.client.get(url)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../glanceclient/common/http.py", line 279, in get
      return self._request('GET', url, **kwargs)
    File "/opt/stack/horizon/venv/lib/python2.7/site-packages/openstack_dashboard/wsgi/../../glanceclient/common/http.py", line 260, in _request
      raise exc.CommunicationError(message=message)
  CommunicationError: Error finding address for https://glance.ash2.symcpe.net/v1/images/detail?sort_key=created_at&sort_dir=desc&status=active&limit=1000&is_public=True: ('Connection aborted.', BadStatusLine("''",))

  
  From the exception handling code (openstack_dashboard/dashboards/project/images/utils.py line 44) I can see that the correct message should be  "Unable to retrieve public images.". However, the UI shows "Danger: An error occurred. Please try again later." instead. This is because CommucationError is not registered in horizon and cannot be recognized by the code.

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