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[Bug 1381295] [NEW] live-migration with context by get_admin_context would fail

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: hougangliu <liuhoug@xxxxxxxxxx>
Date: Wed, 15 Oct 2014 02:21:20 -0000
Reply-to: Bug 1381295 <1381295@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

when 3rd-party wants to live-migration a VM to a host by call compute
API directly ( not by novaclient ) like code snippet 1 as below, the
destination compute service would call glance to get image(refer to Code
snippet 2 as below),  the destniation compute service would raise
exception as Log snippet 1 as below, this is caused by patch
https://review.openstack.org/#/c/121692/2. I think similar problem
exists in nova, too, refer to Code snippet 3.

Code snippet 1：
from nova import compute
ctxt = context.get_admin_context()
self.compute_api = compute.API()
self.compute_api.live_migrate(
            ctxt.elevated(), inst, False, False, host_dict)


Code snippet 2：nova.image.glance.py:
def _create_glance_client(context, host, port, use_ssl, version=1):
    """Instantiate a new glanceclient.Client object."""
    params = {}
    if use_ssl:
        scheme = 'https'
        # https specific params
        params['insecure'] = CONF.glance.api_insecure
        params['ssl_compression'] = False
        if CONF.ssl.cert_file:
            params['cert_file'] = CONF.ssl.cert_file
        if CONF.ssl.key_file:
            params['key_file'] = CONF.ssl.key_file
        if CONF.ssl.ca_file:
            params['cacert'] = CONF.ssl.ca_file
    else:
        scheme = 'http'

    if CONF.auth_strategy == 'keystone':
        # NOTE(isethi): Glanceclient <= 0.9.0.49 accepts only
        # keyword 'token', but later versions accept both the
        # header 'X-Auth-Token' and 'token'
        params['token'] = context.auth_token
        params['identity_headers'] = generate_identity_headers(context)        <<<<<<<<<would return {'X-Auth-Token': None, ....}
    if utils.is_valid_ipv6(host):
        # if so, it is ipv6 address, need to wrap it with '[]'
        host = '[%s]' % host
    endpoint = '%s://%s:%s' % (scheme, host, port)
    return glanceclient.Client(str(version), endpoint, **params)  <<<<<<<<<<<<<<<params=={'identity_headers':{{'X-Auth-Token': None, ....}}...}

 Code snippet 3：
novaclient.client.py:
    def http_log_req(self, method, url, kwargs):
        if not self.http_log_debug:
            return

        string_parts = ['curl -i']

        if not kwargs.get('verify', True):
            string_parts.append(' --insecure')

        string_parts.append(" '%s'" % url)
        string_parts.append(' -X %s' % method)

        headers = copy.deepcopy(kwargs['headers'])
        self._redact(headers, ['X-Auth-Token'])                  >>>>>>>>>>>>>>>>>>>here
        # because dict ordering changes from 2 to 3
        keys = sorted(headers.keys())
        for name in keys:
            value = headers[name]
            header = ' -H "%s: %s"' % (name, value)
            string_parts.append(header)

        if 'data' in kwargs:
            data = json.loads(kwargs['data'])
            self._redact(data, ['auth', 'passwordCredentials', 'password'])
            string_parts.append(" -d '%s'" % json.dumps(data))
        self._logger.debug("REQ: %s" % "".join(string_parts))


Log  snippet 1：
2014-10-14 00:42:10.699 31346 INFO nova.compute.manager [-] [instance: aa68237f-e669-4025-b16e-f4b50926f7a5] During the sync_power process the instance has moved from host cmo-comp5.ibm.com to host cmo-comp4.ibm.com
2014-10-14 00:42:10.913 31346 INFO nova.compute.manager [req-7be58838-3ec2-43d4-afd1-23d6b3d5e3de None] [instance: aa68237f-e669-4025-b16e-f4b50926f7a5] Post operation of migration started
2014-10-14 00:42:11.148 31346 ERROR oslo.messaging.rpc.dispatcher [req-7be58838-3ec2-43d4-afd1-23d6b3d5e3de ] Exception during message handling: 'NoneType' object has no attribute 'encode'
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 134, in _dispatch_and_reply
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 177, in _dispatch
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 123, in _do_dispatch
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 418, in decorated_function
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/exception.py", line 88, in wrapped
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     payload)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/openstack/common/excutils.py", line 82, in __exit__
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/exception.py", line 71, in wrapped
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return f(self, context, *args, **kw)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 330, in decorated_function
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     kwargs['instance'], e, sys.exc_info())
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/openstack/common/excutils.py", line 82, in __exit__
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 318, in decorated_function
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 5224, in post_live_migration_at_destination
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     block_migration, block_device_info)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 5635, in post_live_migration_at_destination
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     write_to_disk=True)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 4132, in _get_guest_xml
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     context, self._image_api, image_ref, instance)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/utils.py", line 242, in get_image_metadata
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     image = image_api.get(context, image_id_or_uri)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/image/api.py", line 89, in get
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     include_locations=include_locations)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/image/glance.py", line 311, in show
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     _reraise_translated_image_exception(image_id)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/image/glance.py", line 309, in show
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     image = self._client.call(context, version, 'get', image_id)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/image/glance.py", line 232, in call
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return getattr(client.images, method)(*args, **kwargs)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/v1/images.py", line 126, in get
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     % urlparse.quote(str(image_id)))
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/common/http.py", line 248, in head
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return self._request('HEAD', url, **kwargs)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/common/http.py", line 192, in _request
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     self.log_curl_request(method, conn_url, headers, data, kwargs)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/common/http.py", line 99, in log_curl_request
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     header = '-H \'%s: %s\'' % safe_header(key, value)
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/common/utils.py", line 394, in safe_header
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     v = value.encode('utf-8')
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher AttributeError: 'NoneType' object has no attribute 'encode'
2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher
2014-10-14 00:42:11.152 31346 ERROR oslo.messaging._drivers.common [req-7be58838-3ec2-43d4-afd1-23d6b3d5e3de ] Returning exception 'NoneType' object has no attribute 'encode' to caller

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1381295

Title:
  live-migration with context by get_admin_context would fail

Status in OpenStack Compute (Nova):
  New

Bug description:
  when 3rd-party wants to live-migration a VM to a host by call compute
  API directly ( not by novaclient ) like code snippet 1 as below, the
  destination compute service would call glance to get image(refer to
  Code snippet 2 as below),  the destniation compute service would raise
  exception as Log snippet 1 as below, this is caused by patch
  https://review.openstack.org/#/c/121692/2. I think similar problem
  exists in nova, too, refer to Code snippet 3.

  Code snippet 1：
  from nova import compute
  ctxt = context.get_admin_context()
  self.compute_api = compute.API()
  self.compute_api.live_migrate(
              ctxt.elevated(), inst, False, False, host_dict)

  
  Code snippet 2：nova.image.glance.py:
  def _create_glance_client(context, host, port, use_ssl, version=1):
      """Instantiate a new glanceclient.Client object."""
      params = {}
      if use_ssl:
          scheme = 'https'
          # https specific params
          params['insecure'] = CONF.glance.api_insecure
          params['ssl_compression'] = False
          if CONF.ssl.cert_file:
              params['cert_file'] = CONF.ssl.cert_file
          if CONF.ssl.key_file:
              params['key_file'] = CONF.ssl.key_file
          if CONF.ssl.ca_file:
              params['cacert'] = CONF.ssl.ca_file
      else:
          scheme = 'http'

      if CONF.auth_strategy == 'keystone':
          # NOTE(isethi): Glanceclient <= 0.9.0.49 accepts only
          # keyword 'token', but later versions accept both the
          # header 'X-Auth-Token' and 'token'
          params['token'] = context.auth_token
          params['identity_headers'] = generate_identity_headers(context)        <<<<<<<<<would return {'X-Auth-Token': None, ....}
      if utils.is_valid_ipv6(host):
          # if so, it is ipv6 address, need to wrap it with '[]'
          host = '[%s]' % host
      endpoint = '%s://%s:%s' % (scheme, host, port)
      return glanceclient.Client(str(version), endpoint, **params)  <<<<<<<<<<<<<<<params=={'identity_headers':{{'X-Auth-Token': None, ....}}...}

   Code snippet 3：
  novaclient.client.py:
      def http_log_req(self, method, url, kwargs):
          if not self.http_log_debug:
              return

          string_parts = ['curl -i']

          if not kwargs.get('verify', True):
              string_parts.append(' --insecure')

          string_parts.append(" '%s'" % url)
          string_parts.append(' -X %s' % method)

          headers = copy.deepcopy(kwargs['headers'])
          self._redact(headers, ['X-Auth-Token'])                  >>>>>>>>>>>>>>>>>>>here
          # because dict ordering changes from 2 to 3
          keys = sorted(headers.keys())
          for name in keys:
              value = headers[name]
              header = ' -H "%s: %s"' % (name, value)
              string_parts.append(header)

          if 'data' in kwargs:
              data = json.loads(kwargs['data'])
              self._redact(data, ['auth', 'passwordCredentials', 'password'])
              string_parts.append(" -d '%s'" % json.dumps(data))
          self._logger.debug("REQ: %s" % "".join(string_parts))

  
  Log  snippet 1：
  2014-10-14 00:42:10.699 31346 INFO nova.compute.manager [-] [instance: aa68237f-e669-4025-b16e-f4b50926f7a5] During the sync_power process the instance has moved from host cmo-comp5.ibm.com to host cmo-comp4.ibm.com
  2014-10-14 00:42:10.913 31346 INFO nova.compute.manager [req-7be58838-3ec2-43d4-afd1-23d6b3d5e3de None] [instance: aa68237f-e669-4025-b16e-f4b50926f7a5] Post operation of migration started
  2014-10-14 00:42:11.148 31346 ERROR oslo.messaging.rpc.dispatcher [req-7be58838-3ec2-43d4-afd1-23d6b3d5e3de ] Exception during message handling: 'NoneType' object has no attribute 'encode'
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 134, in _dispatch_and_reply
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 177, in _dispatch
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 123, in _do_dispatch
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 418, in decorated_function
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/exception.py", line 88, in wrapped
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     payload)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/openstack/common/excutils.py", line 82, in __exit__
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/exception.py", line 71, in wrapped
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 330, in decorated_function
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     kwargs['instance'], e, sys.exc_info())
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/openstack/common/excutils.py", line 82, in __exit__
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 318, in decorated_function
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 5224, in post_live_migration_at_destination
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     block_migration, block_device_info)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 5635, in post_live_migration_at_destination
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     write_to_disk=True)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 4132, in _get_guest_xml
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     context, self._image_api, image_ref, instance)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/compute/utils.py", line 242, in get_image_metadata
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     image = image_api.get(context, image_id_or_uri)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/image/api.py", line 89, in get
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     include_locations=include_locations)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/image/glance.py", line 311, in show
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     _reraise_translated_image_exception(image_id)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/image/glance.py", line 309, in show
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     image = self._client.call(context, version, 'get', image_id)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/nova/image/glance.py", line 232, in call
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return getattr(client.images, method)(*args, **kwargs)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/v1/images.py", line 126, in get
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     % urlparse.quote(str(image_id)))
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/common/http.py", line 248, in head
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     return self._request('HEAD', url, **kwargs)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/common/http.py", line 192, in _request
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     self.log_curl_request(method, conn_url, headers, data, kwargs)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/common/http.py", line 99, in log_curl_request
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     header = '-H \'%s: %s\'' % safe_header(key, value)
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/glanceclient/common/utils.py", line 394, in safe_header
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher     v = value.encode('utf-8')
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher AttributeError: 'NoneType' object has no attribute 'encode'
  2014-10-14 00:42:11.148 31346 TRACE oslo.messaging.rpc.dispatcher
  2014-10-14 00:42:11.152 31346 ERROR oslo.messaging._drivers.common [req-7be58838-3ec2-43d4-afd1-23d6b3d5e3de ] Returning exception 'NoneType' object has no attribute 'encode' to caller

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Follow ups

[Bug 1381295] Re: safe_header raises AttributeError if X-Auth-Token is None
From: Louis Taylor, 2014-12-18
[Bug 1381295] Re: Live migration fails when called via RPC API with admin context
From: Matt Riedemann, 2014-10-17
[Bug 1381295] Re: Live migration fails when called via RPC API with admin context
From: Joe Cropper, 2014-10-17
[Bug 1381295] [NEW] live-migration with context by get_admin_context would fail
From: hougangliu, 2014-10-15
References

[Bug 1381295] [NEW] live-migration with context by get_admin_context would fail
From: hougangliu, 2014-10-15