96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
# Copyright (c) 2010-2012 OpenStack Foundation
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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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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from ConfigParser import ConfigParser, NoSectionError, NoOptionError
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from swift.common.memcached import MemcacheRing
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class MemcacheMiddleware(object):
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"""
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Caching middleware that manages caching in swift.
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"""
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def __init__(self, app, conf):
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self.app = app
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self.memcache_servers = conf.get('memcache_servers')
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serialization_format = conf.get('memcache_serialization_support')
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try:
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# Originally, while we documented using memcache_max_connections
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# we only accepted max_connections
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max_conns = int(conf.get('memcache_max_connections',
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conf.get('max_connections', 0)))
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except ValueError:
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max_conns = 0
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if (not self.memcache_servers
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or serialization_format is None
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or max_conns <= 0):
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path = os.path.join(conf.get('swift_dir', '/etc/swift'),
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'memcache.conf')
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memcache_conf = ConfigParser()
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if memcache_conf.read(path):
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if not self.memcache_servers:
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try:
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self.memcache_servers = \
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memcache_conf.get('memcache', 'memcache_servers')
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except (NoSectionError, NoOptionError):
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pass
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if serialization_format is None:
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try:
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serialization_format = \
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memcache_conf.get('memcache',
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'memcache_serialization_support')
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except (NoSectionError, NoOptionError):
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pass
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if max_conns <= 0:
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try:
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new_max_conns = \
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memcache_conf.get('memcache',
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'memcache_max_connections')
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max_conns = int(new_max_conns)
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except (NoSectionError, NoOptionError, ValueError):
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pass
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if not self.memcache_servers:
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self.memcache_servers = '127.0.0.1:11211'
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if max_conns <= 0:
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max_conns = 2
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if serialization_format is None:
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serialization_format = 2
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else:
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serialization_format = int(serialization_format)
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self.memcache = MemcacheRing(
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[s.strip() for s in self.memcache_servers.split(',') if s.strip()],
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allow_pickle=(serialization_format == 0),
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allow_unpickle=(serialization_format <= 1),
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max_conns=max_conns)
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def __call__(self, env, start_response):
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env['swift.cache'] = self.memcache
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return self.app(env, start_response)
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def filter_factory(global_conf, **local_conf):
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conf = global_conf.copy()
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conf.update(local_conf)
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def cache_filter(app):
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return MemcacheMiddleware(app, conf)
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return cache_filter
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