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# -*- coding: utf-8 -*-
# interfaces.py
# Copyright (C) 2017 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from zope.interface import Interface
class IBlobsBackend(Interface):
"""
An interface for a BlobsBackend.
"""
def read_blob(user, blob_id, request, namespace=''):
"""
Read blob with a given blob_id, and write it to the passed request.
:returns: a deferred that fires upon finishing.
"""
def write_blob(user, blob_id, request, namespace=''):
"""
Write blob to the storage, reading it from the passed request.
:returns: a deferred that fires upon finishing.
"""
def delete_blob(user, blob_id, namespace=''):
"""
Delete the given blob_id.
"""
def get_blob_size(user, blob_id, namespace=''):
"""
Get the size of the given blob id.
"""
def list_blobs(user, request, namespace='', order_by=None):
"""
Returns a json-encoded list of ids from user's blobs storage,
optionally ordered by order_by parameter and optionally restricted by
namespace.
:returns: a deferred that fires upon finishing.
"""
def get_total_storage(user):
"""
Get the size used by a given user as the sum of all the blobs stored
unders its namespace.
"""
def add_tag_header(user, blob_id, request, namespace=''):
"""
Adds a header 'Tag' to the passed request object, containing the last
16 bytes of the encoded blob, which according to the spec contains the
tag.
:returns: a deferred that fires upon finishing.
"""
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