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# Copyright (c) 2012-2014 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 """
from swift.common.swob import HTTPConflict, HTTPNotImplemented
from swift.common.utils import public, timing_stats, replication
from gluster.swift.common.exceptions import AlreadyExistsAsFile, \
AlreadyExistsAsDir
from swift.common.request_helpers import split_and_validate_path
from swift.obj import server
from gluster.swift.obj.diskfile import DiskFileManager
class GlusterSwiftDiskFileRouter(object):
"""
Replacement for Swift's DiskFileRouter object.
Always returns GlusterSwift's DiskFileManager implementation.
"""
def __init__(self, *args, **kwargs):
self.manager_cls = DiskFileManager(*args, **kwargs)
def __getitem__(self, policy):
return self.manager_cls
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
"""
# Replaces Swift's DiskFileRouter object reference with ours.
self._diskfile_router = GlusterSwiftDiskFileRouter(conf, self.logger)
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.
For Gluster, this is a no-op as there are no container DB entries
to be created that tracks objects to be expired. Objects to be
expired will be determined by crawling the filesystem directly.
"""
return
@public
@timing_stats()
def PUT(self, request):
try:
# now call swift's PUT method
return server.ObjectController.PUT(self, request)
except (AlreadyExistsAsFile, AlreadyExistsAsDir):
device = \
split_and_validate_path(request, 1, 5, True)
return HTTPConflict(drive=device, request=request)
@public
@replication
@timing_stats(sample_rate=0.1)
def REPLICATE(self, request):
"""
In Swift, this method handles REPLICATE requests for the Swift
Object Server. This is used by the object replicator to get hashes
for directories.
Gluster-Swift does not support this as it expects the underlying
GlusterFS to take care of replication
"""
return HTTPNotImplemented(request=request)
@public
@replication
@timing_stats(sample_rate=0.1)
def REPLICATION(self, request):
return HTTPNotImplemented(request=request)
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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