diff options
| author | Alexander Makarov <amakarov@mirantis.com> | 2015-08-27 17:25:52 +0300 |
|---|---|---|
| committer | Alexander Makarov <amakarov@mirantis.com> | 2015-08-28 15:04:44 +0300 |
| commit | 6757913f0f7bf36c845a222cd8e5691a4d07c503 (patch) | |
| tree | 60712e2f8aba62f7de35797fbd0594ac38df00d9 /pbr/packaging.py | |
| parent | 1e05037c2ae02a4d52d0f50abf00d61021971508 (diff) | |
| download | pbr-6757913f0f7bf36c845a222cd8e5691a4d07c503.tar.gz | |
Protect WSGI application with a critical section
When configured as an Apache WSGI module a race condition
is possible during keystone cache initialization.
The operation raises exception region.RegionAlreadyConfigured.
This is a result of the race condition involving global
'application' variable being initialized several times
(1 per thread).
Apache modwsgi documentation suggests protecting global objects
with thread locks.
Change-Id: Ib9e2207b0d1d9cee656736e94865fb404b6a868d
Related-Bug: 1482271
Diffstat (limited to 'pbr/packaging.py')
| -rw-r--r-- | pbr/packaging.py | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/pbr/packaging.py b/pbr/packaging.py index 672b8a7..f920374 100644 --- a/pbr/packaging.py +++ b/pbr/packaging.py @@ -250,6 +250,8 @@ def have_nose(): _wsgi_text = """#PBR Generated from %(group)r +import threading + from %(module_name)s import %(import_target)s if __name__ == "__main__": @@ -275,7 +277,12 @@ if __name__ == "__main__": server.serve_forever() else: - application = %(invoke_target)s() + application = None + app_lock = threading.Lock() + + with app_lock: + if application is None: + application = %(invoke_target)s() """ |