645 lines
24 KiB
Python
645 lines
24 KiB
Python
# Copyright 2010 OpenStack Foundation
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# Copyright 2013 NTT corp.
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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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from __future__ import absolute_import
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import copy
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import itertools
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import random
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import shutil
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import sys
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import time
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import glanceclient.exc
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from oslo_config import cfg
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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 timeutils
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import six
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from six.moves import range
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from six.moves import urllib
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from cinder import exception
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from cinder.i18n import _
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glance_opts = [
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cfg.ListOpt('allowed_direct_url_schemes',
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default=[],
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help='A list of url schemes that can be downloaded directly '
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'via the direct_url. Currently supported schemes: '
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'[file, cinder].'),
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cfg.StrOpt('glance_catalog_info',
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default='image:glance:publicURL',
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help='Info to match when looking for glance in the service '
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'catalog. Format is: separated values of the form: '
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'<service_type>:<service_name>:<endpoint_type> - '
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'Only used if glance_api_servers are not provided.'),
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]
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glance_core_properties_opts = [
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cfg.ListOpt('glance_core_properties',
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default=['checksum', 'container_format',
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'disk_format', 'image_name', 'image_id',
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'min_disk', 'min_ram', 'name', 'size'],
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help='Default core properties of image')
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]
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CONF = cfg.CONF
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CONF.register_opts(glance_opts)
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CONF.register_opts(glance_core_properties_opts)
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CONF.import_opt('glance_api_version', 'cinder.common.config')
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LOG = logging.getLogger(__name__)
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def _parse_image_ref(image_href):
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"""Parse an image href into composite parts.
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:param image_href: href of an image
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:returns: a tuple of the form (image_id, netloc, use_ssl)
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:raises ValueError:
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"""
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url = urllib.parse.urlparse(image_href)
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netloc = url.netloc
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image_id = url.path.split('/')[-1]
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use_ssl = (url.scheme == 'https')
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return (image_id, netloc, use_ssl)
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def _create_glance_client(context, netloc, use_ssl, version=None):
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"""Instantiate a new glanceclient.Client object."""
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if version is None:
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version = CONF.glance_api_version
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params = {}
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if use_ssl:
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scheme = 'https'
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# https specific params
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params['insecure'] = CONF.glance_api_insecure
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params['ssl_compression'] = CONF.glance_api_ssl_compression
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params['cacert'] = CONF.glance_ca_certificates_file
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else:
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scheme = 'http'
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if CONF.auth_strategy == 'keystone':
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params['token'] = context.auth_token
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if CONF.glance_request_timeout is not None:
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params['timeout'] = CONF.glance_request_timeout
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endpoint = '%s://%s' % (scheme, netloc)
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return glanceclient.Client(str(version), endpoint, **params)
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def get_api_servers(context):
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"""Return Iterable over shuffled api servers.
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Shuffle a list of glance_api_servers and return an iterator
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that will cycle through the list, looping around to the beginning
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if necessary. If CONF.glance_api_servers is None then they will
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be retrieved from the catalog.
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"""
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api_servers = []
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api_servers_info = []
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if CONF.glance_api_servers is None:
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info = CONF.glance_catalog_info
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try:
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service_type, service_name, endpoint_type = info.split(':')
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except ValueError:
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raise exception.InvalidConfigurationValue(_(
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"Failed to parse the configuration option "
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"'glance_catalog_info', must be in the form "
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"<service_type>:<service_name>:<endpoint_type>"))
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for entry in context.service_catalog:
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if entry.get('type') == service_type:
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api_servers.append(
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entry.get('endpoints')[0].get(endpoint_type))
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else:
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for api_server in CONF.glance_api_servers:
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api_servers.append(api_server)
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for api_server in api_servers:
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if '//' not in api_server:
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api_server = 'http://' + api_server
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url = urllib.parse.urlparse(api_server)
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netloc = url.netloc + url.path
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use_ssl = (url.scheme == 'https')
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api_servers_info.append((netloc, use_ssl))
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random.shuffle(api_servers_info)
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return itertools.cycle(api_servers_info)
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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, netloc=None, use_ssl=False,
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version=None):
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if netloc is not None:
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self.client = self._create_static_client(context,
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netloc,
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use_ssl, version)
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else:
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self.client = None
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self.api_servers = None
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self.version = version
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def _create_static_client(self, context, netloc, use_ssl, version):
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"""Create a client that we'll use for every call."""
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self.netloc = netloc
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self.use_ssl = use_ssl
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self.version = version
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return _create_glance_client(context,
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self.netloc,
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self.use_ssl, self.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_servers is None:
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self.api_servers = get_api_servers(context)
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self.netloc, self.use_ssl = next(self.api_servers)
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return _create_glance_client(context,
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self.netloc,
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self.use_ssl, version)
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def call(self, context, method, *args, **kwargs):
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"""Call a glance client method.
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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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version = kwargs.pop('version', self.version)
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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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return getattr(controller, method)(*args, **kwargs)
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except retry_excs as e:
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netloc = self.netloc
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extra = "retrying"
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error_msg = _("Error contacting glance server "
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"'%(netloc)s' for '%(method)s', "
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"%(extra)s.")
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if attempt == num_attempts:
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extra = 'done trying'
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LOG.exception(error_msg, {'netloc': netloc,
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'method': method,
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'extra': extra})
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raise exception.GlanceConnectionFailed(reason=e)
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LOG.exception(error_msg, {'netloc': netloc,
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'method': method,
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'extra': extra})
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time.sleep(1)
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except glanceclient.exc.HTTPOverLimit as e:
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raise exception.ImageLimitExceeded(e)
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class GlanceImageService(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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self._image_schema = None
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self.temp_images = None
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def detail(self, context, **kwargs):
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"""Calls out to Glance for a list of detailed image information."""
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params = self._extract_query_params(kwargs)
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try:
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images = self._client.call(context, 'list', **params)
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except Exception:
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_reraise_translated_exception()
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_images = []
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for image in images:
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if self._is_image_available(context, image):
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_images.append(self._translate_from_glance(context, image))
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return _images
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def _extract_query_params(self, params):
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_params = {}
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accepted_params = ('filters', 'marker', 'limit',
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'sort_key', 'sort_dir')
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for param in accepted_params:
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if param in params:
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_params[param] = params.get(param)
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# NOTE(geguileo): We set is_public default value for v1 because we want
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# to retrieve all images by default. We don't need to send v2
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# equivalent - "visible" - because its default value when omitted is
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# "public, private, shared", which will return all.
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if CONF.glance_api_version <= 1:
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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 show(self, context, image_id):
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"""Returns a dict with image data for the given opaque image id."""
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try:
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image = self._client.call(context, 'get', image_id)
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except Exception:
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_reraise_translated_image_exception(image_id)
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if not self._is_image_available(context, image):
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raise exception.ImageNotFound(image_id=image_id)
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base_image_meta = self._translate_from_glance(context, image)
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return base_image_meta
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def get_location(self, context, image_id):
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"""Get backend storage location url.
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Returns a tuple containing the direct url and locations representing
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the backend storage location, or (None, None) if these attributes are
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not shown by Glance.
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"""
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if CONF.glance_api_version == 1:
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# image location not available in v1
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return (None, None)
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try:
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# direct_url is returned by v2 api
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client = GlanceClientWrapper(version=2)
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image_meta = client.call(context, 'get', image_id)
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except Exception:
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_reraise_translated_image_exception(image_id)
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if not self._is_image_available(context, image_meta):
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raise exception.ImageNotFound(image_id=image_id)
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# some glance stores like nfs only meta data
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# is stored and returned as locations.
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# so composite of two needs to be returned.
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return (getattr(image_meta, 'direct_url', None),
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getattr(image_meta, 'locations', None))
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def add_location(self, context, image_id, url, metadata):
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"""Add a backend location url to an image.
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Returns a dict containing image metadata on success.
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"""
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if CONF.glance_api_version != 2:
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raise exception.Invalid("Image API version 2 is disabled.")
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client = GlanceClientWrapper(version=2)
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try:
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return client.call(context, 'add_location',
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image_id, url, metadata)
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except Exception:
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_reraise_translated_image_exception(image_id)
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def download(self, context, image_id, data=None):
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"""Calls out to Glance for data and writes data."""
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if data and 'file' in CONF.allowed_direct_url_schemes:
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direct_url, locations = self.get_location(context, image_id)
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urls = [direct_url] + [loc.get('url') for loc in locations or []]
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for url in urls:
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if url is None:
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continue
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parsed_url = urllib.parse.urlparse(url)
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if parsed_url.scheme == "file":
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# a system call to cp could have significant performance
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# advantages, however we do not have the path to files at
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# this point in the abstraction.
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with open(parsed_url.path, "r") as f:
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shutil.copyfileobj(f, data)
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return
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try:
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image_chunks = self._client.call(context, 'data', image_id)
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except Exception:
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_reraise_translated_image_exception(image_id)
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if not data:
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return image_chunks
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else:
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for chunk in image_chunks:
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data.write(chunk)
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def create(self, context, image_meta, data=None):
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"""Store the image data and return the new image object."""
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sent_service_image_meta = self._translate_to_glance(image_meta)
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if data:
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sent_service_image_meta['data'] = data
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recv_service_image_meta = self._client.call(context, 'create',
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**sent_service_image_meta)
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return self._translate_from_glance(context, recv_service_image_meta)
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def update(self, context, image_id,
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image_meta, data=None, purge_props=True):
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"""Modify the given image with the new data."""
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# For v2, _translate_to_glance stores custom properties in image meta
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# directly. We need the custom properties to identify properties to
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# remove if purge_props is True. Save the custom properties before
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# translate.
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if CONF.glance_api_version > 1 and purge_props:
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props_to_update = image_meta.get('properties', {}).keys()
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image_meta = self._translate_to_glance(image_meta)
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# NOTE(dosaboy): see comment in bug 1210467
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if CONF.glance_api_version == 1:
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image_meta['purge_props'] = purge_props
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# NOTE(bcwaldon): id is not an editable field, but it is likely to be
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# passed in by calling code. Let's be nice and ignore it.
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image_meta.pop('id', None)
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try:
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# NOTE(dosaboy): the v2 api separates update from upload
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if CONF.glance_api_version > 1:
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if data:
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self._client.call(context, 'upload', image_id, data)
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if image_meta:
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if purge_props:
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# Properties to remove are those not specified in
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# input properties.
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cur_image_meta = self.show(context, image_id)
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cur_props = cur_image_meta['properties'].keys()
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remove_props = list(set(cur_props) -
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set(props_to_update))
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image_meta['remove_props'] = remove_props
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image_meta = self._client.call(context, 'update', image_id,
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**image_meta)
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else:
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image_meta = self._client.call(context, 'get', image_id)
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else:
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if data:
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image_meta['data'] = data
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image_meta = self._client.call(context, 'update', image_id,
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**image_meta)
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except Exception:
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_reraise_translated_image_exception(image_id)
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else:
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return self._translate_from_glance(context, image_meta)
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def delete(self, context, image_id):
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"""Delete the given image.
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:raises ImageNotFound: if the image does not exist.
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:raises NotAuthorized: if the user is not an owner.
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"""
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try:
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self._client.call(context, 'delete', image_id)
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except glanceclient.exc.NotFound:
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raise exception.ImageNotFound(image_id=image_id)
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return True
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def _translate_from_glance(self, context, image):
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"""Get image metadata from glance image.
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Extract metadata from image and convert it's properties
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to type cinder expected.
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:param image: glance image object
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:return: image metadata dictionary
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"""
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if CONF.glance_api_version == 2:
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if self._image_schema is None:
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self._image_schema = self._client.call(context, 'get',
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controller='schemas',
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schema_name='image',
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version=2)
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# NOTE(aarefiev): get base image property, store image 'schema'
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# is redundant, so ignore it.
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image_meta = {key: getattr(image, key)
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for key in image.keys()
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if self._image_schema.is_base_property(key) is True
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and key != 'schema'}
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# NOTE(aarefiev): nova is expected that all image properties
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# (custom or defined in schema-image.json) stores in
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# 'properties' key.
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image_meta['properties'] = {
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key: getattr(image, key) for key in image.keys()
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if self._image_schema.is_base_property(key) is False}
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else:
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image_meta = _extract_attributes(image)
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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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@staticmethod
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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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# NOTE(tsekiyama): From the Image API v2, custom properties must
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# be stored in image_meta directly, instead of the 'properties' key.
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if CONF.glance_api_version >= 2:
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properties = image_meta.get('properties')
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if properties:
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image_meta.update(properties)
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del image_meta['properties']
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return image_meta
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@staticmethod
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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 Nova 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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if image.is_public or context.is_admin:
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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 _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):
|
|
properties[attr] = jsonutils.loads(prop)
|
|
|
|
|
|
def _json_dumps(properties, attr):
|
|
prop = properties[attr]
|
|
if not isinstance(prop, six.string_types):
|
|
properties[attr] = jsonutils.dumps(prop)
|
|
|
|
|
|
_CONVERT_PROPS = ('block_device_mapping', 'mappings')
|
|
|
|
|
|
def _convert(method, metadata):
|
|
metadata = copy.deepcopy(metadata)
|
|
properties = metadata.get('properties')
|
|
if properties:
|
|
for attr in _CONVERT_PROPS:
|
|
if attr in properties:
|
|
method(properties, attr)
|
|
|
|
return metadata
|
|
|
|
|
|
def _convert_from_string(metadata):
|
|
return _convert(_json_loads, metadata)
|
|
|
|
|
|
def _convert_to_string(metadata):
|
|
return _convert(_json_dumps, metadata)
|
|
|
|
|
|
def _extract_attributes(image):
|
|
# NOTE(hdd): If a key is not found, base.Resource.__getattr__() may perform
|
|
# a get(), resulting in a useless request back to glance. This list is
|
|
# therefore sorted, with dependent attributes as the end
|
|
# 'deleted_at' depends on 'deleted'
|
|
# 'checksum' depends on 'status' == 'active'
|
|
IMAGE_ATTRIBUTES = ['size', 'disk_format', 'owner',
|
|
'container_format', 'status', 'id',
|
|
'name', 'created_at', 'updated_at',
|
|
'deleted', 'deleted_at', 'checksum',
|
|
'min_disk', 'min_ram', 'protected']
|
|
if CONF.glance_api_version == 2:
|
|
IMAGE_ATTRIBUTES.append('visibility')
|
|
else:
|
|
IMAGE_ATTRIBUTES.append('is_public')
|
|
|
|
output = {}
|
|
|
|
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
|
|
else:
|
|
output[attr] = getattr(image, attr, None)
|
|
|
|
output['properties'] = getattr(image, 'properties', {})
|
|
|
|
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.ImageNotFound(image_id=image_id)
|
|
if isinstance(exc_value, glanceclient.exc.BadRequest):
|
|
return exception.Invalid(exc_value)
|
|
return exc_value
|
|
|
|
|
|
def _translate_plain_exception(exc_value):
|
|
if isinstance(exc_value, (glanceclient.exc.Forbidden,
|
|
glanceclient.exc.Unauthorized)):
|
|
return exception.NotAuthorized(exc_value)
|
|
if isinstance(exc_value, glanceclient.exc.NotFound):
|
|
return exception.NotFound(exc_value)
|
|
if isinstance(exc_value, glanceclient.exc.BadRequest):
|
|
return exception.Invalid(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, glance_netloc, use_ssl) = _parse_image_ref(image_href)
|
|
glance_client = GlanceClientWrapper(context=context,
|
|
netloc=glance_netloc,
|
|
use_ssl=use_ssl)
|
|
except ValueError:
|
|
raise exception.InvalidImageRef(image_href=image_href)
|
|
|
|
image_service = GlanceImageService(client=glance_client)
|
|
return image_service, image_id
|
|
|
|
|
|
def get_default_image_service():
|
|
return GlanceImageService()
|