669 lines
25 KiB
Python
669 lines
25 KiB
Python
# Copyright 2010 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Implementation of an image service that uses Glance as the backend."""
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import copy
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import inspect
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import os
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import re
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import stat
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import sys
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import time
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import cryptography
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from cursive import exception as cursive_exception
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from cursive import signature_utils
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import glanceclient
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import glanceclient.exc
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from glanceclient.v2 import schemas
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from keystoneauth1 import loading as ks_loading
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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from oslo_utils import excutils
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from oslo_utils import timeutils
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import six
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from six.moves import range
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from cyborg.common import exception
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from cyborg.common import utils
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import cyborg.conf
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from cyborg import objects
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from cyborg import service_auth
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LOG = logging.getLogger(__name__)
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CONF = cyborg.conf.CONF
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_SESSION = None
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def _session_and_auth(context):
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# Session is cached, but auth needs to be pulled from context each time.
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global _SESSION
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if not _SESSION:
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_SESSION = ks_loading.load_session_from_conf_options(
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CONF, cyborg.conf.glance.glance_group.name)
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auth = service_auth.get_auth_plugin(context)
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return _SESSION, auth
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def _glanceclient_from_endpoint(context, endpoint, version):
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sess, auth = _session_and_auth(context)
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return glanceclient.Client(version, session=sess, auth=auth,
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endpoint_override=endpoint,
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global_request_id=context.global_id)
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def generate_glance_url(context):
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"""Return the glance url."""
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return get_api_server(context)
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def _endpoint_from_image_ref(image_href):
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"""Return the image_ref and guessed endpoint from an image url.
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:param image_href: href of an image
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:returns: a tuple of the form (image_id, endpoint_url)
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"""
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parts = image_href.split('/')
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image_id = parts[-1]
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# the endpoint is everything in the url except the last 3 bits
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# which are version, 'images', and image_id
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endpoint = '/'.join(parts[:-3])
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return (image_id, endpoint)
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def generate_identity_headers(context, status='Confirmed'):
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return {
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'X-Auth-Token': getattr(context, 'auth_token', None),
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'X-User-Id': getattr(context, 'user_id', None),
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'X-Tenant-Id': getattr(context, 'project_id', None),
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'X-Roles': ','.join(getattr(context, 'roles', [])),
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'X-Identity-Status': status,
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}
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def get_api_server(context):
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"""Get the service endpoint."""
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sess, auth = _session_and_auth(context)
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ksa_adap = utils.get_ksa_adapter(
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cyborg.conf.glance.DEFAULT_SERVICE_TYPE,
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ksa_auth=auth, ksa_session=sess,
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min_version='2.0', max_version='2.latest')
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endpoint = utils.get_endpoint(ksa_adap)
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if endpoint:
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# NOTE(mriedem): Due to python-glanceclient bug 1707995 we have
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# to massage the endpoint URL otherwise it won't work properly.
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# We can't use glanceclient.common.utils.strip_version because
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# of bug 1748009.
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endpoint = re.sub(r'/v\d+(\.\d+)?/?$', '/', endpoint)
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return endpoint
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class GlanceClientWrapper(object):
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"""Glance client wrapper class that implements retries."""
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def __init__(self, context=None, endpoint=None):
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version = 2
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if endpoint is not None:
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self.client = self._create_static_client(context,
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endpoint,
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version)
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else:
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self.client = None
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self.api_server = None
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def _create_static_client(self, context, endpoint, version):
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"""Create a client that we'll use for every call."""
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self.api_server = str(endpoint)
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return _glanceclient_from_endpoint(context, endpoint, version)
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def _create_onetime_client(self, context, version):
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"""Create a client that will be used for one call."""
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if self.api_server is None:
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self.api_server = get_api_server(context)
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return _glanceclient_from_endpoint(context, self.api_server, version)
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def call(self, context, version, method, *args, **kwargs):
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"""Call a glance client method. If we get a connection error,
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retry the request according to CONF.glance.num_retries.
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"""
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retry_excs = (glanceclient.exc.ServiceUnavailable,
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glanceclient.exc.InvalidEndpoint,
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glanceclient.exc.CommunicationError)
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num_attempts = 1 + CONF.glance.num_retries
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for attempt in range(1, num_attempts + 1):
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client = self.client or self._create_onetime_client(context,
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version)
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try:
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controller = getattr(client,
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kwargs.pop('controller', 'images'))
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result = getattr(controller, method)(*args, **kwargs)
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if inspect.isgenerator(result):
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# Convert generator results to a list, so that we can
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# catch any potential exceptions now and retry the call.
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return list(result)
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return result
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except retry_excs as e:
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if attempt < num_attempts:
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extra = "retrying"
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else:
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extra = 'done trying'
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LOG.exception("Error contacting glance server "
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"'%(server)s' for '%(method)s', "
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"%(extra)s.",
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{'server': self.api_server,
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'method': method, 'extra': extra})
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if attempt == num_attempts:
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raise exception.GlanceConnectionFailed(
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server=str(self.api_server), reason=six.text_type(e))
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time.sleep(1)
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class GlanceImageServiceV2(object):
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"""Provides storage and retrieval of disk image objects within Glance."""
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def __init__(self, client=None):
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self._client = client or GlanceClientWrapper()
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@staticmethod
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def _safe_fsync(fh):
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"""Performs os.fsync on a filehandle only if it is supported.
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fsync on a pipe, FIFO, or socket raises OSError with EINVAL. This
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method discovers whether the target filehandle is one of these types
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and only performs fsync if it isn't.
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:param fh: Open filehandle (not a path or fileno) to maybe fsync.
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"""
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fileno = fh.fileno()
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mode = os.fstat(fileno).st_mode
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# A pipe answers True to S_ISFIFO
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if not any(check(mode) for check in (stat.S_ISFIFO, stat.S_ISSOCK)):
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os.fsync(fileno)
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def get_images_by_properties(self, context, properties):
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"""Retrieve all images that have the given properties.
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:param properties: dictionary of properties.
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E.g. {"function_id": "3AFB"}
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:returns: List of images
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"""
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image_generator = self._client.call(context, 2, 'list', properties)
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return list(image_generator)
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def download(self, context, image_id, data=None, dst_path=None):
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"""Calls out to Glance for data and writes data."""
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try:
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image_chunks = self._client.call(context, 2, 'data', image_id)
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except Exception:
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_reraise_translated_image_exception(image_id)
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if image_chunks.wrapped is None:
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# None is a valid return value, but there's nothing we can do with
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# a image with no associated data
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raise exception.ImageUnacceptable(image_id=image_id,
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reason='Image has no \
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associated data')
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# Retrieve properties for verification of Glance image signature
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verifier = None
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if CONF.glance.verify_glance_signatures:
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image_meta_dict = self.show(context, image_id,
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include_locations=False)
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image_meta = objects.ImageMeta.from_dict(image_meta_dict)
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img_signature = image_meta.properties.get('img_signature')
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img_sig_hash_method = image_meta.properties.get(
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'img_signature_hash_method'
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)
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img_sig_cert_uuid = image_meta.properties.get(
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'img_signature_certificate_uuid'
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)
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img_sig_key_type = image_meta.properties.get(
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'img_signature_key_type'
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)
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try:
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verifier = signature_utils.get_verifier(
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context=context,
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img_signature_certificate_uuid=img_sig_cert_uuid,
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img_signature_hash_method=img_sig_hash_method,
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img_signature=img_signature,
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img_signature_key_type=img_sig_key_type,
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)
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except cursive_exception.SignatureVerificationError:
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with excutils.save_and_reraise_exception():
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LOG.error('Image signature verification failed '
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'for image: %s', image_id)
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close_file = False
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if data is None and dst_path:
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data = open(dst_path, 'wb')
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close_file = True
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if data is None:
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# Perform image signature verification
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if verifier:
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try:
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for chunk in image_chunks:
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verifier.update(chunk)
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verifier.verify()
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LOG.info('Image signature verification succeeded '
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'for image: %s', image_id)
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except cryptography.exceptions.InvalidSignature:
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with excutils.save_and_reraise_exception():
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LOG.error('Image signature verification failed '
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'for image: %s', image_id)
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return image_chunks
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else:
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try:
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for chunk in image_chunks:
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if verifier:
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verifier.update(chunk)
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data.write(chunk)
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if verifier:
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verifier.verify()
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LOG.info('Image signature verification succeeded '
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'for image %s', image_id)
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except cryptography.exceptions.InvalidSignature:
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data.truncate(0)
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with excutils.save_and_reraise_exception():
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LOG.error('Image signature verification failed '
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'for image: %s', image_id)
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except Exception as ex:
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with excutils.save_and_reraise_exception():
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LOG.error("Error writing to %(path)s: %(exception)s",
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{'path': dst_path, 'exception': ex})
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finally:
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if close_file:
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# Ensure that the data is pushed all the way down to
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# persistent storage. This ensures that in the event of a
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# subsequent host crash we don't have running instances
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# using a corrupt backing file.
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data.flush()
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self._safe_fsync(data)
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data.close()
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def _extract_query_params(params):
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_params = {}
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accepted_params = ('filters', 'marker', 'limit',
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'page_size', 'sort_key', 'sort_dir')
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for param in accepted_params:
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if params.get(param):
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_params[param] = params.get(param)
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# ensure filters is a dict
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_params.setdefault('filters', {})
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# NOTE(vish): don't filter out private images
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_params['filters'].setdefault('is_public', 'none')
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return _params
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def _extract_query_params_v2(params):
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_params = {}
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accepted_params = ('filters', 'marker', 'limit',
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'page_size', 'sort_key', 'sort_dir')
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for param in accepted_params:
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if params.get(param):
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_params[param] = params.get(param)
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# ensure filters is a dict
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_params.setdefault('filters', {})
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# NOTE(vish): don't filter out private images
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_params['filters'].setdefault('is_public', 'none')
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# adopt filters to be accepted by glance v2 api
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filters = _params['filters']
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new_filters = {}
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for filter_ in filters:
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# remove 'property-' prefix from filters by custom properties
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if filter_.startswith('property-'):
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new_filters[filter_.lstrip('property-')] = filters[filter_]
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elif filter_ == 'changes-since':
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# convert old 'changes-since' into new 'updated_at' filter
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updated_at = 'gte:' + filters['changes-since']
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new_filters['updated_at'] = updated_at
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elif filter_ == 'is_public':
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# convert old 'is_public' flag into 'visibility' filter
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# omit the filter if is_public is None
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is_public = filters['is_public']
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if is_public.lower() in ('true', '1'):
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new_filters['visibility'] = 'public'
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elif is_public.lower() in ('false', '0'):
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new_filters['visibility'] = 'private'
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else:
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new_filters[filter_] = filters[filter_]
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_params['filters'] = new_filters
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return _params
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def _is_image_available(context, image):
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"""Check image availability.
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This check is needed in case cyborg and Glance are deployed
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without authentication turned on.
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"""
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# The presence of an auth token implies this is an authenticated
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# request and we need not handle the noauth use-case.
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if hasattr(context, 'auth_token') and context.auth_token:
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return True
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def _is_image_public(image):
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# NOTE(jaypipes) V2 Glance API replaced the is_public attribute
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# with a visibility attribute. We do this here to prevent the
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# glanceclient for a V2 image model from throwing an
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# exception from warlock when trying to access an is_public
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# attribute.
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if hasattr(image, 'visibility'):
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return str(image.visibility).lower() == 'public'
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else:
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return image.is_public
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if context.is_admin or _is_image_public(image):
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return True
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properties = image.properties
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if context.project_id and ('owner_id' in properties):
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return str(properties['owner_id']) == str(context.project_id)
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if context.project_id and ('project_id' in properties):
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return str(properties['project_id']) == str(context.project_id)
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try:
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user_id = properties['user_id']
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except KeyError:
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return False
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return str(user_id) == str(context.user_id)
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def _translate_to_glance(image_meta):
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image_meta = _convert_to_string(image_meta)
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image_meta = _remove_read_only(image_meta)
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image_meta = _convert_to_v2(image_meta)
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return image_meta
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def _convert_to_v2(image_meta):
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output = {}
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for name, value in image_meta.items():
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if name == 'properties':
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for prop_name, prop_value in value.items():
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# if allow_additional_image_properties is disabled we can't
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# define kernel_id and ramdisk_id as None, so we have to omit
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# these properties if they are not set.
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if prop_name in ('kernel_id', 'ramdisk_id') and \
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prop_value is not None and \
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prop_value.strip().lower() in ('none', ''):
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continue
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# in glance only string and None property values are allowed,
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# v1 client accepts any values and converts them to string,
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# v2 doesn't - so we have to take care of it.
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elif prop_value is None or isinstance(
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prop_value, six.string_types):
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output[prop_name] = prop_value
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else:
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output[prop_name] = str(prop_value)
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elif name in ('min_ram', 'min_disk'):
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output[name] = int(value)
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elif name == 'is_public':
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output['visibility'] = 'public' if value else 'private'
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elif name in ('size', 'deleted'):
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continue
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else:
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output[name] = value
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return output
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def _translate_from_glance(image, include_locations=False):
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image_meta = _extract_attributes_v2(
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image, include_locations=include_locations)
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image_meta = _convert_timestamps_to_datetimes(image_meta)
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image_meta = _convert_from_string(image_meta)
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return image_meta
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def _convert_timestamps_to_datetimes(image_meta):
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"""Returns image with timestamp fields converted to datetime objects."""
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for attr in ['created_at', 'updated_at', 'deleted_at']:
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if image_meta.get(attr):
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image_meta[attr] = timeutils.parse_isotime(image_meta[attr])
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return image_meta
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# NOTE(bcwaldon): used to store non-string data in glance metadata
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def _json_loads(properties, attr):
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prop = properties[attr]
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if isinstance(prop, six.string_types):
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properties[attr] = jsonutils.loads(prop)
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def _json_dumps(properties, attr):
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prop = properties[attr]
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if not isinstance(prop, six.string_types):
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properties[attr] = jsonutils.dumps(prop)
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_CONVERT_PROPS = ('block_device_mapping', 'mappings')
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def _convert(method, metadata):
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metadata = copy.deepcopy(metadata)
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properties = metadata.get('properties')
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if properties:
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for attr in _CONVERT_PROPS:
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if attr in properties:
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method(properties, attr)
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return metadata
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def _convert_from_string(metadata):
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return _convert(_json_loads, metadata)
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def _convert_to_string(metadata):
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return _convert(_json_dumps, metadata)
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def _extract_attributes(image, include_locations=False):
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# TODO(mfedosin): Remove this function once we move to glance V2
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# completely.
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# NOTE(hdd): If a key is not found, base.Resource.__getattr__() may perform
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# a get(), resulting in a useless request back to glance. This list is
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# therefore sorted, with dependent attributes as the end
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# 'deleted_at' depends on 'deleted'
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# 'checksum' depends on 'status' == 'active'
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IMAGE_ATTRIBUTES = ['size', 'disk_format', 'owner',
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'container_format', 'status', 'id',
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'name', 'created_at', 'updated_at',
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'deleted', 'deleted_at', 'checksum',
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'min_disk', 'min_ram', 'is_public',
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'direct_url', 'locations']
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queued = getattr(image, 'status') == 'queued'
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queued_exclude_attrs = ['disk_format', 'container_format']
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include_locations_attrs = ['direct_url', 'locations']
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output = {}
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|
|
for attr in IMAGE_ATTRIBUTES:
|
|
if attr == 'deleted_at' and not output['deleted']:
|
|
output[attr] = None
|
|
elif attr == 'checksum' and output['status'] != 'active':
|
|
output[attr] = None
|
|
# image may not have 'name' attr
|
|
elif attr == 'name':
|
|
output[attr] = getattr(image, attr, None)
|
|
# NOTE(liusheng): queued image may not have these attributes and 'name'
|
|
elif queued and attr in queued_exclude_attrs:
|
|
output[attr] = getattr(image, attr, None)
|
|
# NOTE(mriedem): Only get location attrs if including locations.
|
|
elif attr in include_locations_attrs:
|
|
if include_locations:
|
|
output[attr] = getattr(image, attr, None)
|
|
# NOTE(mdorman): 'size' attribute must not be 'None', so use 0 instead
|
|
elif attr == 'size':
|
|
# NOTE(mriedem): A snapshot image may not have the size attribute
|
|
# set so default to 0.
|
|
output[attr] = getattr(image, attr, 0) or 0
|
|
else:
|
|
# NOTE(xarses): Anything that is caught with the default value
|
|
# will result in an additional lookup to glance for said attr.
|
|
# Notable attributes that could have this issue:
|
|
# disk_format, container_format, name, deleted, checksum
|
|
output[attr] = getattr(image, attr, None)
|
|
|
|
output['properties'] = getattr(image, 'properties', {})
|
|
|
|
return output
|
|
|
|
|
|
def _extract_attributes_v2(image, include_locations=False):
|
|
include_locations_attrs = ['direct_url', 'locations']
|
|
omit_attrs = ['self', 'schema', 'protected', 'virtual_size', 'file',
|
|
'tags']
|
|
raw_schema = image.schema
|
|
schema = schemas.Schema(raw_schema)
|
|
output = {'properties': {}, 'deleted': False, 'deleted_at': None,
|
|
'disk_format': None, 'container_format': None, 'name': None,
|
|
'checksum': None}
|
|
for name, value in image.items():
|
|
if (name in omit_attrs
|
|
or name in include_locations_attrs and not include_locations):
|
|
continue
|
|
elif name == 'visibility':
|
|
output['is_public'] = value == 'public'
|
|
elif name == 'size' and value is None:
|
|
output['size'] = 0
|
|
elif schema.is_base_property(name):
|
|
output[name] = value
|
|
else:
|
|
output['properties'][name] = value
|
|
|
|
return output
|
|
|
|
|
|
def _remove_read_only(image_meta):
|
|
IMAGE_ATTRIBUTES = ['status', 'updated_at', 'created_at', 'deleted_at']
|
|
output = copy.deepcopy(image_meta)
|
|
for attr in IMAGE_ATTRIBUTES:
|
|
if attr in output:
|
|
del output[attr]
|
|
return output
|
|
|
|
|
|
def _reraise_translated_image_exception(image_id):
|
|
"""Transform the exception for the image but keep its traceback intact."""
|
|
exc_type, exc_value, exc_trace = sys.exc_info()
|
|
new_exc = _translate_image_exception(image_id, exc_value)
|
|
six.reraise(type(new_exc), new_exc, exc_trace)
|
|
|
|
|
|
def _reraise_translated_exception():
|
|
"""Transform the exception but keep its traceback intact."""
|
|
exc_type, exc_value, exc_trace = sys.exc_info()
|
|
new_exc = _translate_plain_exception(exc_value)
|
|
six.reraise(type(new_exc), new_exc, exc_trace)
|
|
|
|
|
|
def _translate_image_exception(image_id, exc_value):
|
|
if isinstance(exc_value, (glanceclient.exc.Forbidden,
|
|
glanceclient.exc.Unauthorized)):
|
|
return exception.ImageNotAuthorized(image_id=image_id)
|
|
if isinstance(exc_value, glanceclient.exc.NotFound):
|
|
return exception.ResourceNotFound(
|
|
resource='Image',
|
|
msg='with uuid=%s' % image_id)
|
|
if isinstance(exc_value, glanceclient.exc.BadRequest):
|
|
return exception.ImageBadRequest(image_id=image_id,
|
|
response=six.text_type(exc_value))
|
|
return exc_value
|
|
|
|
|
|
def _translate_plain_exception(exc_value):
|
|
if isinstance(exc_value, (glanceclient.exc.Forbidden,
|
|
glanceclient.exc.Unauthorized)):
|
|
return exception.Forbidden(six.text_type(exc_value))
|
|
if isinstance(exc_value, glanceclient.exc.NotFound):
|
|
return exception.NotFound(six.text_type(exc_value))
|
|
if isinstance(exc_value, glanceclient.exc.BadRequest):
|
|
return exception.Invalid(six.text_type(exc_value))
|
|
return exc_value
|
|
|
|
|
|
def get_remote_image_service(context, image_href):
|
|
"""Create an image_service and parse the id from the given image_href.
|
|
|
|
The image_href param can be an href of the form
|
|
'http://example.com:9292/v1/images/b8b2c6f7-7345-4e2f-afa2-eedaba9cbbe3',
|
|
or just an id such as 'b8b2c6f7-7345-4e2f-afa2-eedaba9cbbe3'. If the
|
|
image_href is a standalone id, then the default image service is returned.
|
|
|
|
:param image_href: href that describes the location of an image
|
|
:returns: a tuple of the form (image_service, image_id)
|
|
|
|
"""
|
|
# NOTE(bcwaldon): If image_href doesn't look like a URI, assume its a
|
|
# standalone image ID
|
|
if '/' not in str(image_href):
|
|
image_service = get_default_image_service()
|
|
return image_service, image_href
|
|
|
|
try:
|
|
(image_id, endpoint) = _endpoint_from_image_ref(image_href)
|
|
glance_client = GlanceClientWrapper(context=context,
|
|
endpoint=endpoint)
|
|
except ValueError:
|
|
raise exception.InvalidImageRef(image_href=image_href)
|
|
|
|
image_service = GlanceImageServiceV2(client=glance_client)
|
|
return image_service, image_id
|
|
|
|
|
|
def get_default_image_service():
|
|
return GlanceImageServiceV2()
|
|
|
|
|
|
class UpdateGlanceImage(object):
|
|
def __init__(self, context, image_id, metadata, stream):
|
|
self.context = context
|
|
self.image_id = image_id
|
|
self.metadata = metadata
|
|
self.image_stream = stream
|
|
|
|
def start(self):
|
|
image_service, image_id = (
|
|
get_remote_image_service(self.context, self.image_id))
|
|
image_service.update(self.context, image_id, self.metadata,
|
|
self.image_stream, purge_props=False)
|