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glance-image-sync.py
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glance-image-sync.py
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#!/usr/bin/env python
import glob
import os
import socket
import sys
import ConfigParser
from kombu import BrokerConnection
from kombu import Exchange
from kombu import Queue
IMAGE_SYNC_CONFIG = '/etc/glance/glance-image-sync.conf'
GLANCE_API_CONFIG = '/etc/glance/glance-api.conf'
def _read_api_nodes_config():
image_sync_cfg = {}
section = 'DEFAULT'
config = ConfigParser.RawConfigParser({'rsync_user': 'glance'})
if config.read(IMAGE_SYNC_CONFIG):
tmp_api_nodes = config.get(section, 'api_nodes')
image_sync_cfg['rsync_user'] = config.get(section, 'rsync_user')
image_sync_cfg['api_nodes'] = tmp_api_nodes.replace(' ', '').split(',')
return image_sync_cfg
else:
return None
def _read_glance_api_config():
glance_api_cfg = {}
section = 'DEFAULT'
config = ConfigParser.RawConfigParser()
if config.read(GLANCE_API_CONFIG):
if config.get(section, 'notifier_strategy') == 'rabbit':
glance_api_cfg['host'] = config.get(section, 'rabbit_host')
glance_api_cfg['port'] = config.get(section, 'rabbit_port')
glance_api_cfg['use_ssl'] = config.get(section, 'rabbit_use_ssl')
glance_api_cfg['userid'] = config.get(section, 'rabbit_userid')
glance_api_cfg['password'] = config.get(section,
'rabbit_password')
glance_api_cfg['virtual_host'] = config.get(section,
'rabbit_virtual_host')
option = 'rabbit_notification_exchange'
glance_api_cfg['exchange'] = config.get(section, option)
glance_api_cfg['topic'] = config.get(section,
'rabbit_notification_topic')
glance_api_cfg['datadir'] = config.get(section,
'filesystem_store_datadir')
return glance_api_cfg
else:
return None
else:
return None
def _connect(glance_api_cfg):
# We use BrokerConnection rather than Connection as RHEL 6 has an ancient
# version of kombu library.
conn = BrokerConnection(hostname=glance_api_cfg['host'],
port=glance_api_cfg['port'],
userid=glance_api_cfg['userid'],
password=glance_api_cfg['password'],
virtual_host=glance_api_cfg['virtual_host'])
exchange = Exchange(glance_api_cfg['exchange'],
type='topic',
durable=False,
channel=conn.channel())
return conn, exchange
def _declare_queue(glance_api_cfg, routing_key, conn, exchange):
queue = Queue(name=routing_key,
routing_key=routing_key,
exchange=exchange,
channel=conn.channel(),
durable=False)
queue.declare()
return queue
def _shorten_hostname(node):
# If hostname is an FQDN, split it up and return the short name. Some
# systems may return FQDN on socket.gethostname(), so we choose one
# and run w/ that.
if '.' in node:
return node.split('.')[0]
else:
return node
def _duplicate_notifications(glance_api_cfg, image_sync_cfg, conn, exchange):
routing_key = '%s.info' % glance_api_cfg['topic']
notification_queue = _declare_queue(glance_api_cfg,
routing_key,
conn,
exchange)
while True:
msg = notification_queue.get()
if msg is None:
break
for node in image_sync_cfg['api_nodes']:
routing_key = 'glance_image_sync.%s.info' % _shorten_hostname(node)
node_queue = _declare_queue(glance_api_cfg,
routing_key,
conn,
exchange)
msg_new = exchange.Message(msg.body,
content_type='application/json')
exchange.publish(msg_new, routing_key)
msg.ack()
def _sync_images(glance_api_cfg, image_sync_cfg, conn, exchange):
hostname = socket.gethostname()
routing_key = 'glance_image_sync.%s.info' % _shorten_hostname(hostname)
queue = _declare_queue(glance_api_cfg, routing_key, conn, exchange)
while True:
msg = queue.get()
if msg is None:
break
image_filename = "%s/%s" % (glance_api_cfg['datadir'],
msg.payload['payload']['id'])
# An image create generates a create and update notification, so we
# just pass over the create notification and use the update one
# instead.
# Also, we don't send the update notification to the node which
# processed the request (publisher_id) since that node will already
# have the image; we do send deletes to all nodes though since the
# node which receives the delete request may not have the completed
# image yet.
if (msg.payload['event_type'] == 'image.update' and
msg.payload['publisher_id'] != hostname):
print 'Update detected on %s ...' % (image_filename)
os.system("rsync -a -e 'ssh -o StrictHostKeyChecking=no' "
"%s@%s:%s %s" % (image_sync_cfg['rsync_user'],
msg.payload['publisher_id'],
image_filename, image_filename))
msg.ack()
elif msg.payload['event_type'] == 'image.delete':
print 'Delete detected on %s ...' % (image_filename)
# Don't delete file if it's still being copied (we're looking for
# the temporary file as it's being copied by rsync here).
image_glob = '%s/.*%s*' % (glance_api_cfg['datadir'],
msg.payload['payload']['id'])
if not glob.glob(image_glob):
os.system('rm %s' % (image_filename))
msg.ack()
else:
msg.ack()
def main(args):
if len(args) == 2:
cmd = args[1]
else:
sys.exit(1)
if cmd in ('duplicate-notifications', 'sync-images', 'both'):
glance_api_cfg = _read_glance_api_config()
image_sync_cfg = _read_api_nodes_config()
if glance_api_cfg and image_sync_cfg:
conn, exchange = _connect(glance_api_cfg)
else:
sys.exit(1)
else:
sys.exit(1)
if cmd == 'duplicate-notifications':
_duplicate_notifications(glance_api_cfg, image_sync_cfg, conn,
exchange)
elif cmd == 'sync-images':
_sync_images(glance_api_cfg, image_sync_cfg, conn, exchange)
elif cmd == 'both':
_duplicate_notifications(glance_api_cfg, image_sync_cfg, conn,
exchange)
_sync_images(glance_api_cfg, image_sync_cfg, conn, exchange)
conn.close()
if __name__ == '__main__':
main(sys.argv)