glance/bin/glance-cache-cleaner

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#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Glance Image Cache Invalid Cache Entry and Stalled Image cleaner
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This is meant to be run as a periodic task from cron.
If something goes wrong while we're caching an image (for example the fetch
times out, or an exception is raised), we create an 'invalid' entry. These
entires are left around for debugging purposes. However, after some period of
time, we want to clean these up.
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Also, if an incomplete image hangs around past the image_cache_stall_time
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period, we automatically sweep it up.
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"""
import gettext
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import os
import sys
# If ../glance/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
os.pardir,
os.pardir))
if os.path.exists(os.path.join(possible_topdir, 'glance', '__init__.py')):
sys.path.insert(0, possible_topdir)
gettext.install('glance', unicode=1)
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from glance.common import config
if __name__ == '__main__':
try:
Convert glance to use the new cfg module The changes here are substantial and widespread, but in summary: - We use cfg to parse the CLI and config files, rather than optparse and PasteDeploy - A schema is defined for all configuration options close to the code which uses the option - 2 ConfigOpts sub-classes are added to config.py basically just defining how to find config files; this means we can now use e.g. glance.conf for base config values which glance-api.conf can override - load_paste_app() is changed to load the paste app from the last config file in the stack and pass the app the ConfigOpts instance - The generic app and filter factories in wsgi.py are modified to pass a ConfigOpts instance to the apps and filters - A ConfigOpts subclass is added for the unit tests which writes out config values to a temporary config file and uses cfg to parse that I've tried to keep the switch as unobtrusive as possible leaving further cleanups for later e.g. - Moving PasteDeploy config out of the config files - I think it would be good to aim for having users modify the PasteDeploy config files only in fairly rare circumstances. To achieve this, we might define a number of common pipelines in the PasteDeploy config and allow the user to choose between those pipelines in the glance config. - We should add help strings to all the opts, even just for the sake of documenting them - We should move a bunch of the options into groups - e.g. all the rabbit options - We no longer rely on config files for default values, so the default config files could contain nothing but comments - i.e. explaining each option and showing what the default for it is - making it obvious where a user has explicitly set a value There are a couple of behavioural changes which I don't think are signifcant but are worth mentioning: - We used to support passing a config file as a positional argument but don't anymore; AFAICT, it was only used by glance-manage when launching servers and I've changed that to pass --config-file - log_opt_values() doesn't log unknown opts, so won't log any values for opts which get registered at runtime later Change-Id: Iafa998a2a8d860f1ad57e2cd2afee69686ed58ba
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conf = config.GlanceCacheConfigOpts()
conf()
app = config.load_paste_app(conf, 'glance-cleaner')
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app.run()
except RuntimeError, e:
sys.exit("ERROR: %s" % e)