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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Copyright 2012 Nebula, 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.
import logging
import cloudfiles
from django.conf import settings
from django.utils.translation import ugettext as _
from horizon import exceptions
from horizon.api.base import url_for
LOG = logging.getLogger(__name__)
class SwiftAuthentication(object):
""" Auth container in the format CloudFiles expects. """
def __init__(self, storage_url, auth_token):
self.storage_url = storage_url
self.auth_token = auth_token
def authenticate(self):
return (self.storage_url, '', self.auth_token)
def swift_api(request):
endpoint = url_for(request, 'object-store')
LOG.debug('Swift connection created using token "%s" and url "%s"'
% (request.session['token'], endpoint))
auth = SwiftAuthentication(endpoint, request.session['token'])
return cloudfiles.get_connection(auth=auth)
def swift_container_exists(request, container_name):
try:
swift_api(request).get_container(container_name)
return True
except cloudfiles.errors.NoSuchContainer:
return False
def swift_object_exists(request, container_name, object_name):
container = swift_api(request).get_container(container_name)
try:
container.get_object(object_name)
return True
except cloudfiles.errors.NoSuchObject:
return False
def swift_get_containers(request, marker=None):
limit = getattr(settings, 'API_RESULT_LIMIT', 1000)
containers = swift_api(request).get_all_containers(limit=limit + 1,
marker=marker)
if(len(containers) > limit):
return (containers[0:-1], True)
else:
return (containers, False)
def swift_create_container(request, name):
if swift_container_exists(request, name):
raise exceptions.AlreadyExists(name, 'container')
return swift_api(request).create_container(name)
def swift_delete_container(request, name):
swift_api(request).delete_container(name)
def swift_get_objects(request, container_name, prefix=None, marker=None):
limit = getattr(settings, 'API_RESULT_LIMIT', 1000)
container = swift_api(request).get_container(container_name)
objects = container.get_objects(prefix=prefix,
marker=marker,
limit=limit + 1)
if(len(objects) > limit):
return (objects[0:-1], True)
else:
return (objects, False)
def swift_copy_object(request, orig_container_name, orig_object_name,
new_container_name, new_object_name):
try:
# FIXME(gabriel): Cloudfiles currently fails at unicode in the
# copy_to method, so to provide a better experience we check for
# unicode here and pre-empt with an error message rather than
# letting the call fail.
str(orig_container_name)
str(orig_object_name)
str(new_container_name)
str(new_object_name)
except UnicodeEncodeError:
raise exceptions.HorizonException(_("Unicode is not currently "
"supported for object copy."))
container = swift_api(request).get_container(orig_container_name)
if swift_object_exists(request, new_container_name, new_object_name):
raise exceptions.AlreadyExists(new_object_name, 'object')
orig_obj = container.get_object(orig_object_name)
return orig_obj.copy_to(new_container_name, new_object_name)
def swift_upload_object(request, container_name, object_name, object_file):
container = swift_api(request).get_container(container_name)
obj = container.create_object(object_name)
obj.send(object_file)
return obj
def swift_delete_object(request, container_name, object_name):
container = swift_api(request).get_container(container_name)
container.delete_object(object_name)
def swift_get_object(request, container_name, object_name):
container = swift_api(request).get_container(container_name)
return container.get_object(object_name)
def swift_get_object_data(request, container_name, object_name):
container = swift_api(request).get_container(container_name)
return container.get_object(object_name).stream()
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