3a66817727
When I first started grafyaml, I wanted to better understand how existing OpenStack libraries worked. So, with that in mind, I choose oslo_log as the logging class for this program. However, now that we have imported it under openstack-infra, we don't really want to depend on OpenStack libraries, incase there is a breakage. The main reason for this, if OpenStack libraries break, we still want the infrastructure to work so we can fix the problem. Change-Id: Iee9b1d9d9abb4da4d285531b64a7e2505240be12 Signed-off-by: Paul Belanger <pabelanger@redhat.com>
75 lines
2.1 KiB
Python
75 lines
2.1 KiB
Python
# Copyright 2015 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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import os
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from dogpile.cache.region import make_region
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from oslo_config import cfg
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cache_opts = [
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cfg.StrOpt(
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'cachedir', default='~/.cache/grafyaml',
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help='Directory used by grafyaml to store its cache files.'),
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cfg.BoolOpt(
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'enabled', default=True,
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help='Maintain a special cache that contains an MD5 of every '
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'generated dashboard.'),
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]
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cache_group = cfg.OptGroup(
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name='cache', title='Cache options')
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list_opts = lambda: [(cache_group, cache_opts), ]
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CONF = cfg.CONF
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CONF.register_opts(cache_opts)
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CONF.register_opts(cache_opts, group='cache')
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LOG = logging.getLogger(__name__)
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class Cache(object):
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def __init__(self):
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if not CONF.cache.enabled:
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return
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cache_dir = self._get_cache_dir()
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self.region = make_region().configure(
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'dogpile.cache.dbm',
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arguments={
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'filename': os.path.join(cache_dir, 'cache.dbm')
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}
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)
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def get(self, title):
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if CONF.cache.enabled:
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res = self.region.get(title)
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return res if res else None
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return None
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def has_changed(self, title, md5):
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if CONF.cache.enabled and self.get(title) == md5:
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return False
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return True
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def set(self, title, md5):
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if CONF.cache.enabled:
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self.region.set(title, md5)
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def _get_cache_dir(self):
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path = os.path.expanduser(CONF.cache.cachedir)
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if not os.path.isdir(path):
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os.makedirs(path)
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return path
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