gistfile1.txt

301     def authenticate(self):
302         if has_keyring:
303             keys = [self.auth_url, self.projectid, self.user, self.region_name,
304                     self.endpoint_type, self.service_type, self.service_name,
305                     self.volume_service_name]
306             for index, key in enumerate(keys):
307                 if key is None:
308                     keys[index] = '?'
309             keyring_key = "/".join(keys)
310             if self.os_cache and not self.used_keyring:
311                 # Lookup the token/mgmt url from the keyring first time
312                 # through.
313                 # If we come through again, it's because the old token
314                 # was rejected.
315                 try:
316                     block = keyring.get_password("novaclient_auth",
317                                                  keyring_key)
318                     if block:
319                         self.used_keyring = True
320                         self.auth_token, self.management_url = block.split('|')
321                         return
322                 except Exception:
323                     pass
324 
325         magic_tuple = urlparse.urlsplit(self.auth_url)