/usr/share/pyshared/glance/image_cache/queue_image.py is in python-glance 2012.1.3+stable~20120821-120fcf-0ubuntu1.5.
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# Copyright 2011 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.
"""
Queues images for prefetching into the image cache
"""
import logging
import eventlet
from glance.common import exception
from glance.image_cache import ImageCache
from glance import registry
from glance.registry import context
logger = logging.getLogger(__name__)
class Queuer(object):
def __init__(self, conf, **local_conf):
self.conf = conf
self.cache = ImageCache(conf)
registry.configure_registry_client(conf)
registry.configure_registry_admin_creds(conf)
def queue_image(self, image_id):
ctx = context.RequestContext(is_admin=True, show_deleted=True)
try:
image_meta = registry.get_image_metadata(ctx, image_id)
if image_meta['status'] != 'active':
logger.warn(_("Image '%s' is not active. Not queueing."),
image_id)
return False
except exception.NotFound:
logger.warn(_("No metadata found for image '%s'"), image_id)
return False
logger.debug(_("Queueing image '%s'"), image_id)
self.cache.queue_image(image_id)
return True
def run(self, images):
num_images = len(images)
if num_images == 0:
logger.debug(_("No images to queue!"))
return True
logger.debug(_("Received %d images to queue"), num_images)
pool = eventlet.GreenPool(num_images)
results = pool.imap(self.queue_image, images)
successes = sum([1 for r in results if r is True])
if successes != num_images:
logger.error(_("Failed to successfully queue all "
"images in queue."))
return False
logger.info(_("Successfully queued all %d images"), num_images)
return True
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