AttributeError when use memcache_use_advanced_pool = True in Ocata

[Shuo Liu]

nova.conf:
[keystone_authtoken]
auth_uri = http://100.2.30.156:5000
auth_url = http://100.2.30.156:35357
auth_type = password
project_domain_id = default
user_domain_id = default
project_name = service
username = nova
password = vwvAd5W56PWNiA7spQKThLdWUHbs8toPV381NEfd
memcache_security_strategy = ENCRYPT
memcache_secret_key = ZMlqIsY0JVueQJI0StN9FtAGQy3Jrl0xueXo0WCB
memcached_servers = 100.2.30.156:11211
memcache_use_advanced_pool = True

log:
     return self.func(req, *args, **kwargs)
   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 332, in __call__
     response = self.process_request(req)
   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 623, in process_request
     resp = super(AuthProtocol, self).process_request(request)
   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 405, in process_request
     allow_expired=allow_expired)
   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 435, in _do_fetch_token
     data = self.fetch_token(token, **kwargs)
   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 737, in fetch_token
     cached = self._cache_get_hashes(token_hashes)
   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 720, in _cache_get_hashes
     cached = self._token_cache.get(token)
   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystonemiddleware/auth_token/_cache.py", line 214, in get
     with self._cache_pool.reserve() as cache:
   File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
     return self.gen.next()
   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystonemiddleware/auth_token/_cache.py", line 98, in reserve
     with self._pool.get() as client:
 AttributeError: __exit__

[wangxiyuan (wangxiyuan)]

which version do you use for keystonemiddleware?

[wangxiyuan (wangxiyuan)]

I can reproduce this error after fixing the bug https://bugs.launchpad.net/keystonemiddleware/+bug/1748160

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/542134

[Shuo Liu (liushuobj)]

I found this problem in Ocata version that codes are very different from Q or later

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/542134
Committed: https://git.openstack.org/cgit/openstack/keystonemiddleware/commit/?id=33a712bed791a94df2824fb1ace1a5c3f58342c1
Submitter: Zuul
Branch: master

commit 33a712bed791a94df2824fb1ace1a5c3f58342c1
Author: wangxiyuan <email address hidden>
Date: Thu Feb 8 19:04:36 2018 +0800

    Fix the AttributeError: __exit__ error

    The memcache client class actually has no __exit__ function.

    Remove the "with" usage to avoid the __exit__ error.

    Change-Id: I15b3d08f4afae289e7eb0848ff1db08141196d3c
    Closes-Bug: #1747565

[wangxiyuan (wangxiyuan)]

@Shuo Liu it's fixed now, but it's not easy to backport to O since the code is changed a lot. Can you take a look and fix it privately?

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/keystonemiddleware 5.0.0 release.