86 lines
3.1 KiB
Python
86 lines
3.1 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
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#
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# Author: Fabien Boucher <fabien.boucher@enovance.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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 time
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from swift.common import swob
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from swift.common import utils
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from swift.common import wsgi
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class LastModifiedMiddleware(object):
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"""This middleware update container Last Modified meta
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LastModified is a middleware that add a meta to a container
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when that container and/or objects in it are modified. The meta
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data will contains the epoch timestamp. This middleware aims
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to be used with the synchronizer. It limits the tree parsing
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by giving a way to know a container has been modified since the
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last container synchronization.
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Actions that lead to the container meta modification :
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- POST/PUT on container
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- POST/PUT/DELETE on object in it
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The following shows an example of proxy-server.conf:
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[pipeline:main]
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pipeline = catch_errors cache tempauth last-modified proxy-server
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[filter:last-modified]
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use = egg:swift#last_modified
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# will show as X-Container-Meta-${key_name} for the container's header.
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key_name = Last-Modified
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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.conf = conf
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self.logger = utils.get_logger(self.conf, log_route='last_modified')
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self.key_name = conf.get('key_name',
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'Last-Modified').strip().replace(' ', '-')
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def update_last_modified_meta(self, req, env):
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vrs, account, container, obj = req.split_path(1, 4, True)
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path = env['PATH_INFO']
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if obj:
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path = path.split('/%s' % obj)[0]
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metakey = 'X-Container-Meta-%s' % self.key_name
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headers = {metakey: str(time.time())}
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set_meta_req = wsgi.make_pre_authed_request(env,
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method='POST',
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path=path,
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headers=headers,
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swift_source='lm')
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set_meta_req.get_response(self.app)
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@swob.wsgify
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def __call__(self, req):
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vrs, account, container, obj = req.split_path(1, 4, True)
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if (req.method in ('POST', 'PUT') and
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container or req.method == 'DELETE' and obj):
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new_env = req.environ.copy()
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self.update_last_modified_meta(req, new_env)
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return self.app
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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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return lambda app: LastModifiedMiddleware(app, conf)
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