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location.py
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location.py
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# Copyright 2014 OpenStack Foundation
# All Rights Reserved.
#
# 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 collections
import copy
import glance_store as store
from oslo_config import cfg
from oslo_log import log as logging
from oslo_utils import encodeutils
from oslo_utils import excutils
from glance.common import exception
from glance.common import signature_utils
from glance.common import utils
import glance.domain.proxy
from glance import i18n
_ = i18n._
_LE = i18n._LE
_LI = i18n._LI
CONF = cfg.CONF
LOG = logging.getLogger(__name__)
class ImageRepoProxy(glance.domain.proxy.Repo):
def __init__(self, image_repo, context, store_api, store_utils):
self.context = context
self.store_api = store_api
proxy_kwargs = {'context': context, 'store_api': store_api,
'store_utils': store_utils}
super(ImageRepoProxy, self).__init__(image_repo,
item_proxy_class=ImageProxy,
item_proxy_kwargs=proxy_kwargs)
def _set_acls(self, image):
public = image.visibility == 'public'
member_ids = []
if image.locations and not public:
member_repo = image.get_member_repo()
member_ids = [m.member_id for m in member_repo.list()]
for location in image.locations:
self.store_api.set_acls(location['url'], public=public,
read_tenants=member_ids,
context=self.context)
def add(self, image):
result = super(ImageRepoProxy, self).add(image)
self._set_acls(image)
return result
def save(self, image, from_state=None):
result = super(ImageRepoProxy, self).save(image, from_state=from_state)
self._set_acls(image)
return result
def _check_location_uri(context, store_api, store_utils, uri):
"""Check if an image location is valid.
:param context: Glance request context
:param store_api: store API module
:param store_utils: store utils module
:param uri: location's uri string
"""
try:
# NOTE(zhiyan): Some stores return zero when it catch exception
is_ok = (store_utils.validate_external_location(uri) and
store_api.get_size_from_backend(uri, context=context) > 0)
except (store.UnknownScheme, store.NotFound, store.BadStoreUri):
is_ok = False
if not is_ok:
reason = _('Invalid location')
raise exception.BadStoreUri(message=reason)
def _check_image_location(context, store_api, store_utils, location):
_check_location_uri(context, store_api, store_utils, location['url'])
store_api.check_location_metadata(location['metadata'])
def _set_image_size(context, image, locations):
if not image.size:
for location in locations:
size_from_backend = store.get_size_from_backend(
location['url'], context=context)
if size_from_backend:
# NOTE(flwang): This assumes all locations have the same size
image.size = size_from_backend
break
def _count_duplicated_locations(locations, new):
"""
To calculate the count of duplicated locations for new one.
:param locations: The exiting image location set
:param new: The new image location
:returns: The count of duplicated locations
"""
ret = 0
for loc in locations:
if loc['url'] == new['url'] and loc['metadata'] == new['metadata']:
ret += 1
return ret
class ImageFactoryProxy(glance.domain.proxy.ImageFactory):
def __init__(self, factory, context, store_api, store_utils):
self.context = context
self.store_api = store_api
self.store_utils = store_utils
proxy_kwargs = {'context': context, 'store_api': store_api,
'store_utils': store_utils}
super(ImageFactoryProxy, self).__init__(factory,
proxy_class=ImageProxy,
proxy_kwargs=proxy_kwargs)
def new_image(self, **kwargs):
locations = kwargs.get('locations', [])
for loc in locations:
_check_image_location(self.context,
self.store_api,
self.store_utils,
loc)
loc['status'] = 'active'
if _count_duplicated_locations(locations, loc) > 1:
raise exception.DuplicateLocation(location=loc['url'])
return super(ImageFactoryProxy, self).new_image(**kwargs)
class StoreLocations(collections.MutableSequence):
"""
The proxy for store location property. It takes responsibility for:
1. Location uri correctness checking when adding a new location.
2. Remove the image data from the store when a location is removed
from an image.
"""
def __init__(self, image_proxy, value):
self.image_proxy = image_proxy
if isinstance(value, list):
self.value = value
else:
self.value = list(value)
def append(self, location):
# NOTE(flaper87): Insert this
# location at the very end of
# the value list.
self.insert(len(self.value), location)
def extend(self, other):
if isinstance(other, StoreLocations):
locations = other.value
else:
locations = list(other)
for location in locations:
self.append(location)
def insert(self, i, location):
_check_image_location(self.image_proxy.context,
self.image_proxy.store_api,
self.image_proxy.store_utils,
location)
location['status'] = 'active'
if _count_duplicated_locations(self.value, location) > 0:
raise exception.DuplicateLocation(location=location['url'])
self.value.insert(i, location)
_set_image_size(self.image_proxy.context,
self.image_proxy,
[location])
def pop(self, i=-1):
location = self.value.pop(i)
try:
self.image_proxy.store_utils.delete_image_location_from_backend(
self.image_proxy.context,
self.image_proxy.image.image_id,
location)
except Exception:
with excutils.save_and_reraise_exception():
self.value.insert(i, location)
return location
def count(self, location):
return self.value.count(location)
def index(self, location, *args):
return self.value.index(location, *args)
def remove(self, location):
if self.count(location):
self.pop(self.index(location))
else:
self.value.remove(location)
def reverse(self):
self.value.reverse()
# Mutable sequence, so not hashable
__hash__ = None
def __getitem__(self, i):
return self.value.__getitem__(i)
def __setitem__(self, i, location):
_check_image_location(self.image_proxy.context,
self.image_proxy.store_api,
self.image_proxy.store_utils,
location)
location['status'] = 'active'
self.value.__setitem__(i, location)
_set_image_size(self.image_proxy.context,
self.image_proxy,
[location])
def __delitem__(self, i):
location = None
try:
location = self.value.__getitem__(i)
except Exception:
return self.value.__delitem__(i)
self.image_proxy.store_utils.delete_image_location_from_backend(
self.image_proxy.context,
self.image_proxy.image.image_id,
location)
self.value.__delitem__(i)
def __delslice__(self, i, j):
i = max(i, 0)
j = max(j, 0)
locations = []
try:
locations = self.value.__getslice__(i, j)
except Exception:
return self.value.__delslice__(i, j)
for location in locations:
self.image_proxy.store_utils.delete_image_location_from_backend(
self.image_proxy.context,
self.image_proxy.image.image_id,
location)
self.value.__delitem__(i)
def __iadd__(self, other):
self.extend(other)
return self
def __contains__(self, location):
return location in self.value
def __len__(self):
return len(self.value)
def __cast(self, other):
if isinstance(other, StoreLocations):
return other.value
else:
return other
def __cmp__(self, other):
return cmp(self.value, self.__cast(other))
def __iter__(self):
return iter(self.value)
def __copy__(self):
return type(self)(self.image_proxy, self.value)
def __deepcopy__(self, memo):
# NOTE(zhiyan): Only copy location entries, others can be reused.
value = copy.deepcopy(self.value, memo)
self.image_proxy.image.locations = value
return type(self)(self.image_proxy, value)
def _locations_proxy(target, attr):
"""
Make a location property proxy on the image object.
:param target: the image object on which to add the proxy
:param attr: the property proxy we want to hook
"""
def get_attr(self):
value = getattr(getattr(self, target), attr)
return StoreLocations(self, value)
def set_attr(self, value):
if not isinstance(value, (list, StoreLocations)):
reason = _('Invalid locations')
raise exception.BadStoreUri(message=reason)
ori_value = getattr(getattr(self, target), attr)
if ori_value != value:
# NOTE(zhiyan): Enforced locations list was previously empty list.
if len(ori_value) > 0:
raise exception.Invalid(_('Original locations is not empty: '
'%s') % ori_value)
# NOTE(zhiyan): Check locations are all valid.
for location in value:
_check_image_location(self.context,
self.store_api,
self.store_utils,
location)
location['status'] = 'active'
if _count_duplicated_locations(value, location) > 1:
raise exception.DuplicateLocation(location=location['url'])
_set_image_size(self.context, getattr(self, target), value)
return setattr(getattr(self, target), attr, list(value))
def del_attr(self):
value = getattr(getattr(self, target), attr)
while len(value):
self.store_utils.delete_image_location_from_backend(
self.context,
self.image.image_id,
value[0])
del value[0]
setattr(getattr(self, target), attr, value)
return delattr(getattr(self, target), attr)
return property(get_attr, set_attr, del_attr)
class ImageProxy(glance.domain.proxy.Image):
locations = _locations_proxy('image', 'locations')
def __init__(self, image, context, store_api, store_utils):
self.image = image
self.context = context
self.store_api = store_api
self.store_utils = store_utils
proxy_kwargs = {
'context': context,
'image': self,
'store_api': store_api,
}
super(ImageProxy, self).__init__(
image, member_repo_proxy_class=ImageMemberRepoProxy,
member_repo_proxy_kwargs=proxy_kwargs)
def delete(self):
self.image.delete()
if self.image.locations:
for location in self.image.locations:
self.store_utils.delete_image_location_from_backend(
self.context,
self.image.image_id,
location)
def set_data(self, data, size=None):
if size is None:
size = 0 # NOTE(markwash): zero -> unknown size
location, size, checksum, loc_meta = self.store_api.add_to_backend(
CONF,
self.image.image_id,
utils.LimitingReader(utils.CooperativeReader(data),
CONF.image_size_cap),
size,
context=self.context)
# Verify the signature (if correct properties are present)
if (signature_utils.should_verify_signature(
self.image.extra_properties)):
# NOTE(bpoulos): if verification fails, exception will be raised
result = signature_utils.verify_signature(
self.context, checksum, self.image.extra_properties)
if result:
msg = (_LI("Successfully verified signature for image "
"%s") % self.image.image_id)
LOG.info(msg)
self.image.locations = [{'url': location, 'metadata': loc_meta,
'status': 'active'}]
self.image.size = size
self.image.checksum = checksum
self.image.status = 'active'
def get_data(self, offset=0, chunk_size=None):
if not self.image.locations:
raise store.NotFound(_("No image data could be found"))
err = None
for loc in self.image.locations:
try:
data, size = self.store_api.get_from_backend(
loc['url'],
offset=offset,
chunk_size=chunk_size,
context=self.context)
return data
except Exception as e:
LOG.warn(_('Get image %(id)s data failed: '
'%(err)s.')
% {'id': self.image.image_id,
'err': encodeutils.exception_to_unicode(e)})
err = e
# tried all locations
LOG.error(_LE('Glance tried all active locations to get data for '
'image %s but all have failed.') % self.image.image_id)
raise err
class ImageMemberRepoProxy(glance.domain.proxy.Repo):
def __init__(self, repo, image, context, store_api):
self.repo = repo
self.image = image
self.context = context
self.store_api = store_api
super(ImageMemberRepoProxy, self).__init__(repo)
def _set_acls(self):
public = self.image.visibility == 'public'
if self.image.locations and not public:
member_ids = [m.member_id for m in self.repo.list()]
for location in self.image.locations:
self.store_api.set_acls(location['url'], public=public,
read_tenants=member_ids,
context=self.context)
def add(self, member):
super(ImageMemberRepoProxy, self).add(member)
self._set_acls()
def remove(self, member):
super(ImageMemberRepoProxy, self).remove(member)
self._set_acls()