# 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 DiskFile


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 _diskfile(self, device, partition, account, container, obj, **kwargs):
        """Utility method for instantiating a DiskFile."""
        kwargs.setdefault('mount_check', self.mount_check)
        kwargs.setdefault('bytes_per_sync', self.bytes_per_sync)
        kwargs.setdefault('disk_chunk_size', self.disk_chunk_size)
        kwargs.setdefault('threadpool', self.threadpools[device])
        kwargs.setdefault('obj_dir', server.DATADIR)
        kwargs.setdefault('disallowed_metadata_keys',
                          server.DISALLOWED_HEADERS)
        return DiskFile(self.devices, device, partition, account,
                        container, obj, self.logger, **kwargs)

    def container_update(self, op, account, container, obj, request,
                         headers_out, objdevice):
        """
        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).

        :param op: operation performed (ex: 'PUT', or 'DELETE')
        :param account: account name for the object
        :param container: container name for the object
        :param obj: object name
        :param request: the original request object driving the update
        :param headers_out: dictionary of headers to send in the container
                            request(s)
        :param objdevice: device name that the object is in
        """
        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)