ce910bc92e
These were inconsistent, occassionally had the wrong translation marker, and sometimes were substituting variables incorrectly. No functional changes, just a cleanup. Change-Id: I05578f497fc863ad453bba277072b8e4893006bf
681 lines
25 KiB
Python
681 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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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 sys
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import time
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import glanceclient
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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_service import sslutils
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from oslo_utils import excutils
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from oslo_utils import netutils
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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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import six.moves.urllib.parse as urlparse
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from nova import exception
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from nova.i18n import _LE, _LI, _LW
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import nova.image.download as image_xfers
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glance_opts = [
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cfg.StrOpt('host',
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default='$my_ip',
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help='Default glance hostname or IP address'),
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cfg.IntOpt('port',
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default=9292,
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help='Default glance port'),
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cfg.StrOpt('protocol',
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default='http',
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choices=('http', 'https'),
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help='Default protocol to use when connecting to glance. '
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'Set to https for SSL.'),
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cfg.ListOpt('api_servers',
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help='A list of the glance api servers available to nova. '
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'Prefix with https:// for ssl-based glance api servers. '
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'([hostname|ip]:port)'),
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cfg.BoolOpt('api_insecure',
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default=False,
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help='Allow to perform insecure SSL (https) requests to '
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'glance'),
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cfg.IntOpt('num_retries',
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default=0,
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help='Number of retries when uploading / downloading an image '
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'to / from glance.'),
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cfg.ListOpt('allowed_direct_url_schemes',
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default=[],
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help='A list of url scheme that can be downloaded directly '
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'via the direct_url. Currently supported schemes: '
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'[file].'),
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]
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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CONF.register_opts(glance_opts, 'glance')
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CONF.import_opt('auth_strategy', 'nova.api.auth')
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CONF.import_opt('my_ip', 'nova.netconf')
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def generate_glance_url():
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"""Generate the URL to glance."""
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glance_host = CONF.glance.host
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if netutils.is_valid_ipv6(glance_host):
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glance_host = '[%s]' % glance_host
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return "%s://%s:%d" % (CONF.glance.protocol, glance_host,
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CONF.glance.port)
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def generate_image_url(image_ref):
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"""Generate an image URL from an image_ref."""
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return "%s/images/%s" % (generate_glance_url(), image_ref)
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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, host, port)
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:raises ValueError
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"""
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o = urlparse.urlparse(image_href)
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port = o.port or 80
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host = o.netloc.rsplit(':', 1)[0]
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image_id = o.path.split('/')[-1]
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use_ssl = (o.scheme == 'https')
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return (image_id, host, port, use_ssl)
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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', None),
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'X-Tenant-Id': getattr(context, 'tenant', None),
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'X-Roles': ','.join(context.roles),
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'X-Identity-Status': status,
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'X-Service-Catalog': jsonutils.dumps(context.service_catalog),
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}
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def _create_glance_client(context, host, port, use_ssl, version=1):
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"""Instantiate a new glanceclient.Client object."""
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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'] = False
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sslutils.is_enabled(CONF)
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if CONF.ssl.cert_file:
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params['cert_file'] = CONF.ssl.cert_file
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if CONF.ssl.key_file:
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params['key_file'] = CONF.ssl.key_file
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if CONF.ssl.ca_file:
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params['cacert'] = CONF.ssl.ca_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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# NOTE(isethi): Glanceclient <= 0.9.0.49 accepts only
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# keyword 'token', but later versions accept both the
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# header 'X-Auth-Token' and 'token'
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params['token'] = context.auth_token
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params['identity_headers'] = generate_identity_headers(context)
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if netutils.is_valid_ipv6(host):
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# if so, it is ipv6 address, need to wrap it with '[]'
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host = '[%s]' % host
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endpoint = '%s://%s:%s' % (scheme, host, port)
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return glanceclient.Client(str(version), endpoint, **params)
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def get_api_servers():
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"""Shuffle a list of CONF.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.
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"""
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api_servers = []
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configured_servers = (['%s:%s' % (CONF.glance.host, CONF.glance.port)]
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if CONF.glance.api_servers is None
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else CONF.glance.api_servers)
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for api_server in configured_servers:
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if '//' not in api_server:
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api_server = 'http://' + api_server
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o = urlparse.urlparse(api_server)
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port = o.port or 80
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host = o.netloc.rsplit(':', 1)[0]
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if host[0] == '[' and host[-1] == ']':
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host = host[1:-1]
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use_ssl = (o.scheme == 'https')
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api_servers.append((host, port, use_ssl))
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random.shuffle(api_servers)
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return itertools.cycle(api_servers)
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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, host=None, port=None, use_ssl=False,
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version=1):
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if host is not None:
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self.client = self._create_static_client(context,
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host, port,
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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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def _create_static_client(self, context, host, port, use_ssl, version):
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"""Create a client that we'll use for every call."""
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self.host = host
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self.port = port
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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.host, self.port,
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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()
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self.host, self.port, self.use_ssl = next(self.api_servers)
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return _create_glance_client(context,
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self.host, self.port,
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self.use_ssl, 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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retries = CONF.glance.num_retries
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if retries < 0:
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LOG.warning(_LW("Treating negative config value (%(retries)s) for "
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"'glance.num_retries' as 0."),
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{'retries': retries})
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retries = 0
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num_attempts = retries + 1
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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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return getattr(client.images, method)(*args, **kwargs)
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except retry_excs as e:
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host = self.host
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port = self.port
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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(_LE("Error contacting glance server "
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"'%(host)s:%(port)s' for '%(method)s', "
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"%(extra)s."),
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{'host': host, 'port': port,
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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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host=host, port=port, reason=six.text_type(e))
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time.sleep(1)
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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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# NOTE(jbresnah) build the table of download handlers at the beginning
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# so that operators can catch errors at load time rather than whenever
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# a user attempts to use a module. Note this cannot be done in glance
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# space when this python module is loaded because the download module
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# may require configuration options to be parsed.
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self._download_handlers = {}
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download_modules = image_xfers.load_transfer_modules()
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for scheme, mod in six.iteritems(download_modules):
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if scheme not in CONF.glance.allowed_direct_url_schemes:
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continue
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try:
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self._download_handlers[scheme] = mod.get_download_handler()
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except Exception as ex:
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LOG.error(_LE('When loading the module %(module_str)s the '
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'following error occurred: %(ex)s'),
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{'module_str': str(mod), 'ex': ex})
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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 = _extract_query_params(kwargs)
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try:
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images = self._client.call(context, 1, '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 _is_image_available(context, image):
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_images.append(_translate_from_glance(image))
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return _images
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def show(self, context, image_id, include_locations=False,
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show_deleted=True):
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"""Returns a dict with image data for the given opaque image id.
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:param context: The context object to pass to image client
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:param image_id: The UUID of the image
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:param include_locations: (Optional) include locations in the returned
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dict of information if the image service API
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supports it. If the image service API does
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not support the locations attribute, it will
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still be included in the returned dict, as an
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empty list.
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:param show_deleted: (Optional) show the image even the status of
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image is deleted.
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"""
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version = 1
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if include_locations:
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version = 2
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try:
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image = self._client.call(context, version, '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 show_deleted and getattr(image, 'deleted', False):
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raise exception.ImageNotFound(image_id=image_id)
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if not _is_image_available(context, image):
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raise exception.ImageNotFound(image_id=image_id)
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image = _translate_from_glance(image,
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include_locations=include_locations)
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if include_locations:
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locations = image.get('locations', None) or []
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du = image.get('direct_url', None)
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if du:
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locations.append({'url': du, 'metadata': {}})
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image['locations'] = locations
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return image
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def _get_transfer_module(self, scheme):
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try:
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return self._download_handlers[scheme]
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except KeyError:
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return None
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except Exception:
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LOG.error(_LE("Failed to instantiate the download handler "
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"for %(scheme)s"), {'scheme': scheme})
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return
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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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if CONF.glance.allowed_direct_url_schemes and dst_path is not None:
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image = self.show(context, image_id, include_locations=True)
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for entry in image.get('locations', []):
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loc_url = entry['url']
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loc_meta = entry['metadata']
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o = urlparse.urlparse(loc_url)
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xfer_mod = self._get_transfer_module(o.scheme)
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if xfer_mod:
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try:
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xfer_mod.download(context, o, dst_path, loc_meta)
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LOG.info(_LI("Successfully transferred "
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"using %s"), o.scheme)
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return
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except Exception:
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LOG.exception(_LE("Download image error"))
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try:
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image_chunks = self._client.call(context, 1, 'data', image_id)
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except Exception:
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_reraise_translated_image_exception(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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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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data.write(chunk)
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except Exception as ex:
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with excutils.save_and_reraise_exception():
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LOG.error(_LE("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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data.close()
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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 = _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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try:
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recv_service_image_meta = self._client.call(
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context, 1, 'create', **sent_service_image_meta)
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except glanceclient.exc.HTTPException:
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_reraise_translated_exception()
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return _translate_from_glance(recv_service_image_meta)
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def update(self, context, image_id, image_meta, data=None,
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purge_props=True):
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"""Modify the given image with the new data."""
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image_meta = _translate_to_glance(image_meta)
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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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if data:
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image_meta['data'] = data
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try:
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image_meta = self._client.call(context, 1, 'update',
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image_id, **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 _translate_from_glance(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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:raises: ImageNotAuthorized if the user is not authorized.
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"""
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try:
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self._client.call(context, 1, '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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except glanceclient.exc.HTTPForbidden:
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raise exception.ImageNotAuthorized(image_id=image_id)
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return True
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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 _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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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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return image_meta
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def _translate_from_glance(image, include_locations=False):
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image_meta = _extract_attributes(image,
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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."""
|
|
for attr in ['created_at', 'updated_at', 'deleted_at']:
|
|
if image_meta.get(attr):
|
|
image_meta[attr] = timeutils.parse_isotime(image_meta[attr])
|
|
return image_meta
|
|
|
|
|
|
# NOTE(bcwaldon): used to store non-string data in glance metadata
|
|
def _json_loads(properties, attr):
|
|
prop = properties[attr]
|
|
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, include_locations=False):
|
|
# 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', 'is_public',
|
|
'direct_url', 'locations']
|
|
|
|
queued = getattr(image, 'status') == 'queued'
|
|
queued_exclude_attrs = ['disk_format', 'container_format']
|
|
include_locations_attrs = ['direct_url', 'locations']
|
|
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
|
|
# 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)
|
|
else:
|
|
# NOTE(xarses): Anything that is caught with the default value
|
|
# will result in a 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 _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(new_exc, None, 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(new_exc, None, 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(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, glance_host, glance_port, use_ssl) = \
|
|
_parse_image_ref(image_href)
|
|
glance_client = GlanceClientWrapper(context=context,
|
|
host=glance_host, port=glance_port, 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()
|
|
|
|
|
|
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)
|