swift/swift/common/middleware/memcache.py

76 lines
2.7 KiB
Python

# Copyright (c) 2010-2012 OpenStack Foundation
#
# 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.
import os
from ConfigParser import ConfigParser, NoSectionError, NoOptionError
from swift.common.memcached import MemcacheRing
class MemcacheMiddleware(object):
"""
Caching middleware that manages caching in swift.
"""
def __init__(self, app, conf):
self.app = app
self.memcache_servers = conf.get('memcache_servers')
serialization_format = conf.get('memcache_serialization_support')
if not self.memcache_servers or serialization_format is None:
path = os.path.join(conf.get('swift_dir', '/etc/swift'),
'memcache.conf')
memcache_conf = ConfigParser()
if memcache_conf.read(path):
if not self.memcache_servers:
try:
self.memcache_servers = \
memcache_conf.get('memcache', 'memcache_servers')
except (NoSectionError, NoOptionError):
pass
if serialization_format is None:
try:
serialization_format = \
memcache_conf.get('memcache',
'memcache_serialization_support')
except (NoSectionError, NoOptionError):
pass
if not self.memcache_servers:
self.memcache_servers = '127.0.0.1:11211'
if serialization_format is None:
serialization_format = 2
else:
serialization_format = int(serialization_format)
self.memcache = MemcacheRing(
[s.strip() for s in self.memcache_servers.split(',') if s.strip()],
allow_pickle=(serialization_format == 0),
allow_unpickle=(serialization_format <= 1))
def __call__(self, env, start_response):
env['swift.cache'] = self.memcache
return self.app(env, start_response)
def filter_factory(global_conf, **local_conf):
conf = global_conf.copy()
conf.update(local_conf)
def cache_filter(app):
return MemcacheMiddleware(app, conf)
return cache_filter