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[Dave Chen <wei.d.chen@xxxxxxxxx>]

stevedore is landing

** Changed in: keystone
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/1402187

Title:
  Invalid token provider

Status in Keystone:
  Won't Fix

Bug description:
  When specify token provoider as "pkiz" instead of full class path of
  token provider as "keystone.token.providers.[pkiz|pki|uuid].Provider"
  in keystone.conf I will get the following exception thrown in the log
  file.

  2014-12-14 04:48:18.710721 Traceback (most recent call last):
  2014-12-14 04:48:18.710732   File "/var/www/keystone/main", line 53, in <module>
  2014-12-14 04:48:18.710798     drivers = backends.load_backends()
  2014-12-14 04:48:18.710817   File "/opt/stack/keystone/keystone/backends.py", line 48, in load_backends
  2014-12-14 04:48:18.710851     token_provider_api=token.provider.Manager())
  2014-12-14 04:48:18.710867   File "/opt/stack/keystone/keystone/common/dependency.py", line 200, in wrapper
  2014-12-14 04:48:18.710944     self.__wrapped_init__(*args, **kwargs)
  2014-12-14 04:48:18.710950   File "/opt/stack/keystone/keystone/common/dependency.py", line 110, in __wrapped_init__
  2014-12-14 04:48:18.710969     init(self, *args, **kwargs)
  2014-12-14 04:48:18.710974   File "/opt/stack/keystone/keystone/token/provider.py", line 152, in __init__
  2014-12-14 04:48:18.711100     super(Manager, self).__init__(self.get_token_provider())
  2014-12-14 04:48:18.711106   File "/opt/stack/keystone/keystone/common/manager.py", line 70, in __init__
  2014-12-14 04:48:18.711150     self.driver = importutils.import_object(driver_name)
  2014-12-14 04:48:18.711165   File "/usr/local/lib/python2.7/dist-packages/oslo/utils/importutils.py", line 38, in import_object
  2014-12-14 04:48:18.711226     return import_class(import_str)(*args, **kwargs)
  2014-12-14 04:48:18.711244   File "/usr/local/lib/python2.7/dist-packages/oslo/utils/importutils.py", line 27, in import_class
  2014-12-14 04:48:18.711252     __import__(mod_str)
  2014-12-14 04:48:18.711264 ValueError: Empty module name

  I understand the comment in "keystone.conf" has show us how to config
  the provider but in my opinion, it should also support "pkiz|pki|uuid"
  besides the full class path, or at least, there should be one
  dedicated exception to show us what's wrong with the config. Seen from
  the code there is no invalid provider checking, so invalid token
  provider exception to show us what's wrong with the config is desired.

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