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# Copyright (c) 2012-2013 Red Hat, Inc.
#
# 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.
""" Object Server for Gluster for Swift """
# Simply importing this monkey patches the constraint handling to fit our
# needs
import gluster.swift.common.constraints # noqa
from swift.obj import server
from gluster.swift.obj.diskfile import OnDiskManager
class ObjectController(server.ObjectController):
"""
Subclass of the object server's ObjectController which replaces the
container_update method with one that is a no-op (information is simply
stored on disk and already updated by virtue of performing the file system
operations directly).
"""
def setup(self, conf):
"""
Implementation specific setup. This method is called at the very end
by the constructor to allow a specific implementation to modify
existing attributes or add its own attributes.
:param conf: WSGI configuration parameter
"""
# FIXME: Gluster currently does not support x-delete-at, as there is
# no mechanism in GlusterFS itself to expire an object, or an external
# process that will cull expired objects.
try:
self.allowed_headers.remove('x-delete-at')
except KeyError:
pass
# Common on-disk hierarchy shared across account, container and object
# servers.
self._ondisk_mgr = OnDiskManager(conf, self.logger)
def get_diskfile(self, device, partition, account, container, obj,
**kwargs):
"""
Utility method for instantiating a DiskFile object supporting a given
REST API.
An implementation of the object server that wants to use a different
DiskFile class would simply over-ride this method to provide that
behavior.
"""
return self._ondisk_mgr.get_diskfile(device, account, container, obj,
**kwargs)
def container_update(self, *args, **kwargs):
"""
Update the container when objects are updated.
For Gluster, this is just a no-op, since a container is just the
directory holding all the objects (sub-directory hierarchy of files).
"""
return
def delete_at_update(self, *args, **kwargs):
"""
Update the expiring objects container when objects are updated.
FIXME: Gluster currently does not support delete_at headers.
"""
return
def app_factory(global_conf, **local_conf):
"""paste.deploy app factory for creating WSGI object server apps"""
conf = global_conf.copy()
conf.update(local_conf)
return ObjectController(conf)
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