221 lines
7.3 KiB
Python
221 lines
7.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2010 OpenStack LLC.
|
|
# All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
"""Implementation of an image service that uses Glance as the backend"""
|
|
|
|
from __future__ import absolute_import
|
|
|
|
import datetime
|
|
|
|
from glance.common import exception as glance_exception
|
|
|
|
from nova import exception
|
|
from nova import flags
|
|
from nova import log as logging
|
|
from nova import utils
|
|
from nova.image import service
|
|
|
|
|
|
LOG = logging.getLogger('nova.image.glance')
|
|
|
|
FLAGS = flags.FLAGS
|
|
|
|
GlanceClient = utils.import_class('glance.client.Client')
|
|
|
|
|
|
class GlanceImageService(service.BaseImageService):
|
|
"""Provides storage and retrieval of disk image objects within Glance."""
|
|
|
|
GLANCE_ONLY_ATTRS = ["size", "location", "disk_format",
|
|
"container_format"]
|
|
|
|
# NOTE(sirp): Overriding to use _translate_to_service provided by
|
|
# BaseImageService
|
|
SERVICE_IMAGE_ATTRS = service.BaseImageService.BASE_IMAGE_ATTRS +\
|
|
GLANCE_ONLY_ATTRS
|
|
|
|
def __init__(self, client=None):
|
|
# FIXME(sirp): can we avoid dependency-injection here by using
|
|
# stubbing out a fake?
|
|
if client is None:
|
|
self.client = GlanceClient(FLAGS.glance_host, FLAGS.glance_port)
|
|
else:
|
|
self.client = client
|
|
|
|
def index(self, context):
|
|
"""
|
|
Calls out to Glance for a list of images available
|
|
"""
|
|
# NOTE(sirp): We need to use `get_images_detailed` and not
|
|
# `get_images` here because we need `is_public` and `properties`
|
|
# included so we can filter by user
|
|
filtered = []
|
|
image_metas = self.client.get_images_detailed()
|
|
for image_meta in image_metas:
|
|
if self._is_image_available(context, image_meta):
|
|
meta_subset = utils.subset_dict(image_meta, ('id', 'name'))
|
|
filtered.append(meta_subset)
|
|
return filtered
|
|
|
|
def detail(self, context):
|
|
"""
|
|
Calls out to Glance for a list of detailed image information
|
|
"""
|
|
filtered = []
|
|
image_metas = self.client.get_images_detailed()
|
|
for image_meta in image_metas:
|
|
if self._is_image_available(context, image_meta):
|
|
base_image_meta = self._translate_to_base(image_meta)
|
|
filtered.append(base_image_meta)
|
|
return filtered
|
|
|
|
def show(self, context, image_id):
|
|
"""
|
|
Returns a dict containing image data for the given opaque image id.
|
|
"""
|
|
try:
|
|
image_meta = self.client.get_image_meta(image_id)
|
|
except glance_exception.NotFound:
|
|
raise exception.NotFound
|
|
|
|
if not self._is_image_available(context, image_meta):
|
|
raise exception.NotFound
|
|
|
|
base_image_meta = self._translate_to_base(image_meta)
|
|
return base_image_meta
|
|
|
|
def show_by_name(self, context, name):
|
|
"""
|
|
Returns a dict containing image data for the given name.
|
|
"""
|
|
# TODO(vish): replace this with more efficient call when glance
|
|
# supports it.
|
|
image_metas = self.detail(context)
|
|
for image_meta in image_metas:
|
|
if name == image_meta.get('name'):
|
|
return image_meta
|
|
raise exception.NotFound
|
|
|
|
def get(self, context, image_id, data):
|
|
"""
|
|
Calls out to Glance for metadata and data and writes data.
|
|
"""
|
|
try:
|
|
image_meta, image_chunks = self.client.get_image(image_id)
|
|
except glance_exception.NotFound:
|
|
raise exception.NotFound
|
|
|
|
for chunk in image_chunks:
|
|
data.write(chunk)
|
|
|
|
base_image_meta = self._translate_to_base(image_meta)
|
|
return base_image_meta
|
|
|
|
def create(self, context, image_meta, data=None):
|
|
"""
|
|
Store the image data and return the new image id.
|
|
|
|
:raises AlreadyExists if the image already exist.
|
|
"""
|
|
# Translate Base -> Service
|
|
LOG.debug(_("Creating image in Glance. Metadata passed in %s"),
|
|
image_meta)
|
|
sent_service_image_meta = self._translate_to_service(image_meta)
|
|
LOG.debug(_("Metadata after formatting for Glance %s"),
|
|
sent_service_image_meta)
|
|
|
|
recv_service_image_meta = self.client.add_image(
|
|
sent_service_image_meta, data)
|
|
|
|
# Translate Service -> Base
|
|
base_image_meta = self._translate_to_base(recv_service_image_meta)
|
|
LOG.debug(_("Metadata returned from Glance formatted for Base %s"),
|
|
base_image_meta)
|
|
return base_image_meta
|
|
|
|
def update(self, context, image_id, image_meta, data=None):
|
|
"""Replace the contents of the given image with the new data.
|
|
|
|
:raises NotFound if the image does not exist.
|
|
"""
|
|
# NOTE(vish): show is to check if image is available
|
|
self.show(context, image_id)
|
|
try:
|
|
image_meta = self.client.update_image(image_id, image_meta, data)
|
|
except glance_exception.NotFound:
|
|
raise exception.NotFound
|
|
|
|
base_image_meta = self._translate_to_base(image_meta)
|
|
return base_image_meta
|
|
|
|
def delete(self, context, image_id):
|
|
"""
|
|
Delete the given image.
|
|
|
|
:raises NotFound if the image does not exist.
|
|
"""
|
|
# NOTE(vish): show is to check if image is available
|
|
self.show(context, image_id)
|
|
try:
|
|
result = self.client.delete_image(image_id)
|
|
except glance_exception.NotFound:
|
|
raise exception.NotFound
|
|
return result
|
|
|
|
def delete_all(self):
|
|
"""
|
|
Clears out all images
|
|
"""
|
|
pass
|
|
|
|
@classmethod
|
|
def _translate_to_base(cls, image_meta):
|
|
"""Overriding the base translation to handle conversion to datetime
|
|
objects
|
|
"""
|
|
image_meta = service.BaseImageService._propertify_metadata(
|
|
image_meta, cls.SERVICE_IMAGE_ATTRS)
|
|
image_meta = _convert_timestamps_to_datetimes(image_meta)
|
|
return image_meta
|
|
|
|
|
|
# utility functions
|
|
def _convert_timestamps_to_datetimes(image_meta):
|
|
"""
|
|
Returns image with known timestamp fields converted to datetime objects
|
|
"""
|
|
for attr in ['created_at', 'updated_at', 'deleted_at']:
|
|
if image_meta.get(attr):
|
|
image_meta[attr] = _parse_glance_iso8601_timestamp(
|
|
image_meta[attr])
|
|
return image_meta
|
|
|
|
|
|
def _parse_glance_iso8601_timestamp(timestamp):
|
|
"""
|
|
Parse a subset of iso8601 timestamps into datetime objects
|
|
"""
|
|
iso_formats = ["%Y-%m-%dT%H:%M:%S.%f", "%Y-%m-%dT%H:%M:%S"]
|
|
|
|
for iso_format in iso_formats:
|
|
try:
|
|
return datetime.datetime.strptime(timestamp, iso_format)
|
|
except ValueError:
|
|
pass
|
|
|
|
raise ValueError(_("%(timestamp)s does not follow any of the "
|
|
"signatures: %(ISO_FORMATS)s") % locals())
|