#!/usr/bin/env python
# Copyright 2012 Michael Still and Canonical Inc
# Copyright 2014 SoftLayer Technologies, Inc.
# 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.
from __future__ import print_function
import os
import sys
from oslo_config import cfg
from oslo_log import log as logging
from oslo_serialization import jsonutils
from oslo_utils import encodeutils
from oslo_utils import uuidutils
import six
from six.moves import http_client
import six.moves.urllib.parse as urlparse
from webob import exc
from glance.common import config
from glance.common import exception
from glance.common import utils
from glance.i18n import _, _LE, _LI, _LW
LOG = logging.getLogger(__name__)
# NOTE: positional arguments <args> will be parsed before <command> until
# this bug is corrected https://bugs.launchpad.net/oslo.config/+bug/1392428
cli_opts = [
cfg.IntOpt('chunksize',
short='c',
default=65536,
help="Amount of data to transfer per HTTP write."),
cfg.StrOpt('dontreplicate',
short='D',
default=('created_at date deleted_at location updated_at'),
help="List of fields to not replicate."),
cfg.BoolOpt('metaonly',
short='m',
default=False,
help="Only replicate metadata, not images."),
cfg.StrOpt('token',
short='t',
default='',
help=("Pass in your authentication token if you have "
"one. If you use this option the same token is "
"used for both the master and the slave.")),
cfg.StrOpt('mastertoken',
short='M',
default='',
help=("Pass in your authentication token if you have "
"one. This is the token used for the master.")),
cfg.StrOpt('slavetoken',
short='S',
default='',
help=("Pass in your authentication token if you have "
"one. This is the token used for the slave.")),
cfg.StrOpt('command',
positional=True,
help="Command to be given to replicator"),
cfg.MultiStrOpt('args',
positional=True,
help="Arguments for the command"),
]
CONF = cfg.CONF
CONF.register_cli_opts(cli_opts)
logging.register_options(CONF)
# If ../glance/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
os.pardir,
os.pardir))
if os.path.exists(os.path.join(possible_topdir, 'glance', '__init__.py')):
sys.path.insert(0, possible_topdir)
COMMANDS = """Commands:
help <command> Output help for one of the commands below
compare What is missing from the slave glance?
dump Dump the contents of a glance instance to local disk.
livecopy Load the contents of one glance instance into another.
load Load the contents of a local directory into glance.
size Determine the size of a glance instance if dumped to disk.
"""
IMAGE_ALREADY_PRESENT_MESSAGE = _('The image %s is already present on '
'the slave, but our check for it did '
'not find it. This indicates that we '
'do not have permissions to see all '
'the images on the slave server.')
[docs]class ImageService(object):
def __init__(self, conn, auth_token):
"""Initialize the ImageService.
conn: a http_client.HTTPConnection to the glance server
auth_token: authentication token to pass in the x-auth-token header
"""
self.auth_token = auth_token
self.conn = conn
def _http_request(self, method, url, headers, body,
ignore_result_body=False):
"""Perform an HTTP request against the server.
method: the HTTP method to use
url: the URL to request (not including server portion)
headers: headers for the request
body: body to send with the request
ignore_result_body: the body of the result will be ignored
Returns: a http_client response object
"""
if self.auth_token:
headers.setdefault('x-auth-token', self.auth_token)
LOG.debug('Request: %(method)s http://%(server)s:%(port)s'
'%(url)s with headers %(headers)s',
{'method': method,
'server': self.conn.host,
'port': self.conn.port,
'url': url,
'headers': repr(headers)})
self.conn.request(method, url, body, headers)
response = self.conn.getresponse()
headers = self._header_list_to_dict(response.getheaders())
code = response.status
code_description = http_client.responses[code]
LOG.debug('Response: %(code)s %(status)s %(headers)s',
{'code': code,
'status': code_description,
'headers': repr(headers)})
if code == 400:
raise exc.HTTPBadRequest(
explanation=response.read())
if code == 500:
raise exc.HTTPInternalServerError(
explanation=response.read())
if code == 401:
raise exc.HTTPUnauthorized(
explanation=response.read())
if code == 403:
raise exc.HTTPForbidden(
explanation=response.read())
if code == 409:
raise exc.HTTPConflict(
explanation=response.read())
if ignore_result_body:
# NOTE: because we are pipelining requests through a single HTTP
# connection, http_client requires that we read the response body
# before we can make another request. If the caller knows they
# don't care about the body, they can ask us to do that for them.
response.read()
return response
[docs] def get_images(self):
"""Return a detailed list of images.
Yields a series of images as dicts containing metadata.
"""
params = {'is_public': None}
while True:
url = '/v1/images/detail'
query = urlparse.urlencode(params)
if query:
url += '?%s' % query
response = self._http_request('GET', url, {}, '')
result = jsonutils.loads(response.read())
if not result or 'images' not in result or not result['images']:
return
for image in result.get('images', []):
params['marker'] = image['id']
yield image
[docs] def get_image(self, image_uuid):
"""Fetch image data from glance.
image_uuid: the id of an image
Returns: a http_client Response object where the body is the image.
"""
url = '/v1/images/%s' % image_uuid
return self._http_request('GET', url, {}, '')
@staticmethod
def _header_list_to_dict(headers):
"""Expand a list of headers into a dictionary.
headers: a list of [(key, value), (key, value), (key, value)]
Returns: a dictionary representation of the list
"""
d = {}
for (header, value) in headers:
if header.startswith('x-image-meta-property-'):
prop = header.replace('x-image-meta-property-', '')
d.setdefault('properties', {})
d['properties'][prop] = value
else:
d[header.replace('x-image-meta-', '')] = value
return d
@staticmethod
def _dict_to_headers(d):
"""Convert a dictionary into one suitable for a HTTP request.
d: a dictionary
Returns: the same dictionary, with x-image-meta added to every key
"""
h = {}
for key in d:
if key == 'properties':
for subkey in d[key]:
if d[key][subkey] is None:
h['x-image-meta-property-%s' % subkey] = ''
else:
h['x-image-meta-property-%s' % subkey] = d[key][subkey]
else:
h['x-image-meta-%s' % key] = d[key]
return h
[docs] def add_image(self, image_meta, image_data):
"""Upload an image.
image_meta: image metadata as a dictionary
image_data: image data as a object with a read() method
Returns: a tuple of (http response headers, http response body)
"""
url = '/v1/images'
headers = self._dict_to_headers(image_meta)
headers['Content-Type'] = 'application/octet-stream'
headers['Content-Length'] = int(image_meta['size'])
response = self._http_request('POST', url, headers, image_data)
headers = self._header_list_to_dict(response.getheaders())
LOG.debug('Image post done')
body = response.read()
return headers, body
[docs]def get_image_service():
"""Get a copy of the image service.
This is done like this to make it easier to mock out ImageService.
"""
return ImageService
def _human_readable_size(num, suffix='B'):
for unit in ['', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi']:
if abs(num) < 1024.0:
return "%3.1f %s%s" % (num, unit, suffix)
num /= 1024.0
return "%.1f %s%s" % (num, 'Yi', suffix)
[docs]def replication_size(options, args):
"""%(prog)s size <server:port>
Determine the size of a glance instance if dumped to disk.
server:port: the location of the glance instance.
"""
# Make sure server info is provided
if args is None or len(args) < 1:
raise TypeError(_("Too few arguments."))
server, port = utils.parse_valid_host_port(args.pop())
total_size = 0
count = 0
imageservice = get_image_service()
client = imageservice(http_client.HTTPConnection(server, port),
options.slavetoken)
for image in client.get_images():
LOG.debug('Considering image: %(image)s', {'image': image})
if image['status'] == 'active':
total_size += int(image['size'])
count += 1
print(_('Total size is %(size)d bytes (%(human_size)s) across '
'%(img_count)d images') %
{'size': total_size,
'human_size': _human_readable_size(total_size),
'img_count': count})
[docs]def replication_dump(options, args):
"""%(prog)s dump <server:port> <path>
Dump the contents of a glance instance to local disk.
server:port: the location of the glance instance.
path: a directory on disk to contain the data.
"""
# Make sure server and path are provided
if len(args) < 2:
raise TypeError(_("Too few arguments."))
path = args.pop()
server, port = utils.parse_valid_host_port(args.pop())
imageservice = get_image_service()
client = imageservice(http_client.HTTPConnection(server, port),
options.mastertoken)
for image in client.get_images():
LOG.debug('Considering: %(image_id)s (%(image_name)s) '
'(%(image_size)d bytes)',
{'image_id': image['id'],
'image_name': image.get('name', '--unnamed--'),
'image_size': image['size']})
data_path = os.path.join(path, image['id'])
data_filename = data_path + '.img'
if not os.path.exists(data_path):
LOG.info(_LI('Storing: %(image_id)s (%(image_name)s)'
' (%(image_size)d bytes) in %(data_filename)s'),
{'image_id': image['id'],
'image_name': image.get('name', '--unnamed--'),
'image_size': image['size'],
'data_filename': data_filename})
# Dump glance information
if six.PY3:
f = open(data_path, 'w', encoding='utf-8')
else:
f = open(data_path, 'w')
with f:
f.write(jsonutils.dumps(image))
if image['status'] == 'active' and not options.metaonly:
# Now fetch the image. The metadata returned in headers here
# is the same as that which we got from the detailed images
# request earlier, so we can ignore it here. Note that we also
# only dump active images.
LOG.debug('Image %s is active', image['id'])
image_response = client.get_image(image['id'])
with open(data_filename, 'wb') as f:
while True:
chunk = image_response.read(options.chunksize)
if not chunk:
break
f.write(chunk)
def _dict_diff(a, b):
"""A one way dictionary diff.
a: a dictionary
b: a dictionary
Returns: True if the dictionaries are different
"""
# Only things the master has which the slave lacks matter
if set(a.keys()) - set(b.keys()):
LOG.debug('metadata diff -- master has extra keys: %(keys)s',
{'keys': ' '.join(set(a.keys()) - set(b.keys()))})
return True
for key in a:
if str(a[key]) != str(b[key]):
LOG.debug('metadata diff -- value differs for key '
'%(key)s: master "%(master_value)s" vs '
'slave "%(slave_value)s"',
{'key': key,
'master_value': a[key],
'slave_value': b[key]})
return True
return False
[docs]def replication_load(options, args):
"""%(prog)s load <server:port> <path>
Load the contents of a local directory into glance.
server:port: the location of the glance instance.
path: a directory on disk containing the data.
"""
# Make sure server and path are provided
if len(args) < 2:
raise TypeError(_("Too few arguments."))
path = args.pop()
server, port = utils.parse_valid_host_port(args.pop())
imageservice = get_image_service()
client = imageservice(http_client.HTTPConnection(server, port),
options.slavetoken)
updated = []
for ent in os.listdir(path):
if uuidutils.is_uuid_like(ent):
image_uuid = ent
LOG.info(_LI('Considering: %s'), image_uuid)
meta_file_name = os.path.join(path, image_uuid)
with open(meta_file_name) as meta_file:
meta = jsonutils.loads(meta_file.read())
# Remove keys which don't make sense for replication
for key in options.dontreplicate.split(' '):
if key in meta:
LOG.debug('Stripping %(header)s from saved '
'metadata', {'header': key})
del meta[key]
if _image_present(client, image_uuid):
# NOTE(mikal): Perhaps we just need to update the metadata?
# Note that we don't attempt to change an image file once it
# has been uploaded.
LOG.debug('Image %s already present', image_uuid)
headers = client.get_image_meta(image_uuid)
for key in options.dontreplicate.split(' '):
if key in headers:
LOG.debug('Stripping %(header)s from slave '
'metadata', {'header': key})
del headers[key]
if _dict_diff(meta, headers):
LOG.info(_LI('Image %s metadata has changed'), image_uuid)
headers, body = client.add_image_meta(meta)
_check_upload_response_headers(headers, body)
updated.append(meta['id'])
else:
if not os.path.exists(os.path.join(path, image_uuid + '.img')):
LOG.debug('%s dump is missing image data, skipping',
image_uuid)
continue
# Upload the image itself
with open(os.path.join(path, image_uuid + '.img')) as img_file:
try:
headers, body = client.add_image(meta, img_file)
_check_upload_response_headers(headers, body)
updated.append(meta['id'])
except exc.HTTPConflict:
LOG.error(_LE(IMAGE_ALREADY_PRESENT_MESSAGE)
% image_uuid) # noqa
return updated
[docs]def replication_livecopy(options, args):
"""%(prog)s livecopy <fromserver:port> <toserver:port>
Load the contents of one glance instance into another.
fromserver:port: the location of the master glance instance.
toserver:port: the location of the slave glance instance.
"""
# Make sure from-server and to-server are provided
if len(args) < 2:
raise TypeError(_("Too few arguments."))
imageservice = get_image_service()
slave_server, slave_port = utils.parse_valid_host_port(args.pop())
slave_conn = http_client.HTTPConnection(slave_server, slave_port)
slave_client = imageservice(slave_conn, options.slavetoken)
master_server, master_port = utils.parse_valid_host_port(args.pop())
master_conn = http_client.HTTPConnection(master_server, master_port)
master_client = imageservice(master_conn, options.mastertoken)
updated = []
for image in master_client.get_images():
LOG.debug('Considering %(id)s', {'id': image['id']})
for key in options.dontreplicate.split(' '):
if key in image:
LOG.debug('Stripping %(header)s from master metadata',
{'header': key})
del image[key]
if _image_present(slave_client, image['id']):
# NOTE(mikal): Perhaps we just need to update the metadata?
# Note that we don't attempt to change an image file once it
# has been uploaded.
headers = slave_client.get_image_meta(image['id'])
if headers['status'] == 'active':
for key in options.dontreplicate.split(' '):
if key in image:
LOG.debug('Stripping %(header)s from master '
'metadata', {'header': key})
del image[key]
if key in headers:
LOG.debug('Stripping %(header)s from slave '
'metadata', {'header': key})
del headers[key]
if _dict_diff(image, headers):
LOG.info(_LI('Image %(image_id)s (%(image_name)s) '
'metadata has changed'),
{'image_id': image['id'],
'image_name': image.get('name', '--unnamed--')})
headers, body = slave_client.add_image_meta(image)
_check_upload_response_headers(headers, body)
updated.append(image['id'])
elif image['status'] == 'active':
LOG.info(_LI('Image %(image_id)s (%(image_name)s) '
'(%(image_size)d bytes) '
'is being synced'),
{'image_id': image['id'],
'image_name': image.get('name', '--unnamed--'),
'image_size': image['size']})
if not options.metaonly:
image_response = master_client.get_image(image['id'])
try:
headers, body = slave_client.add_image(image,
image_response)
_check_upload_response_headers(headers, body)
updated.append(image['id'])
except exc.HTTPConflict:
LOG.error(_LE(IMAGE_ALREADY_PRESENT_MESSAGE) % image['id']) # noqa
return updated
[docs]def replication_compare(options, args):
"""%(prog)s compare <fromserver:port> <toserver:port>
Compare the contents of fromserver with those of toserver.
fromserver:port: the location of the master glance instance.
toserver:port: the location of the slave glance instance.
"""
# Make sure from-server and to-server are provided
if len(args) < 2:
raise TypeError(_("Too few arguments."))
imageservice = get_image_service()
slave_server, slave_port = utils.parse_valid_host_port(args.pop())
slave_conn = http_client.HTTPConnection(slave_server, slave_port)
slave_client = imageservice(slave_conn, options.slavetoken)
master_server, master_port = utils.parse_valid_host_port(args.pop())
master_conn = http_client.HTTPConnection(master_server, master_port)
master_client = imageservice(master_conn, options.mastertoken)
differences = {}
for image in master_client.get_images():
if _image_present(slave_client, image['id']):
headers = slave_client.get_image_meta(image['id'])
for key in options.dontreplicate.split(' '):
if key in image:
LOG.debug('Stripping %(header)s from master metadata',
{'header': key})
del image[key]
if key in headers:
LOG.debug('Stripping %(header)s from slave metadata',
{'header': key})
del headers[key]
for key in image:
if image[key] != headers.get(key, None):
LOG.warn(_LW('%(image_id)s: field %(key)s differs '
'(source is %(master_value)s, destination '
'is %(slave_value)s)')
% {'image_id': image['id'],
'key': key,
'master_value': image[key],
'slave_value': headers.get(key, 'undefined')})
differences[image['id']] = 'diff'
else:
LOG.debug('%(image_id)s is identical',
{'image_id': image['id']})
elif image['status'] == 'active':
LOG.warn(_LW('Image %(image_id)s ("%(image_name)s") '
'entirely missing from the destination')
% {'image_id': image['id'],
'image_name': image.get('name', '--unnamed')})
differences[image['id']] = 'missing'
return differences
def _check_upload_response_headers(headers, body):
"""Check that the headers of an upload are reasonable.
headers: the headers from the upload
body: the body from the upload
"""
if 'status' not in headers:
try:
d = jsonutils.loads(body)
if 'image' in d and 'status' in d['image']:
return
except Exception:
raise exception.UploadException(body)
def _image_present(client, image_uuid):
"""Check if an image is present in glance.
client: the ImageService
image_uuid: the image uuid to check
Returns: True if the image is present
"""
headers = client.get_image_meta(image_uuid)
return 'status' in headers
[docs]def print_help(options, args):
"""Print help specific to a command.
options: the parsed command line options
args: the command line
"""
if not args:
print(COMMANDS)
else:
command_name = args.pop()
command = lookup_command(command_name)
print(command.__doc__ % {'prog': os.path.basename(sys.argv[0])})
[docs]def lookup_command(command_name):
"""Lookup a command.
command_name: the command name
Returns: a method which implements that command
"""
BASE_COMMANDS = {'help': print_help}
REPLICATION_COMMANDS = {'compare': replication_compare,
'dump': replication_dump,
'livecopy': replication_livecopy,
'load': replication_load,
'size': replication_size}
commands = {}
for command_set in (BASE_COMMANDS, REPLICATION_COMMANDS):
commands.update(command_set)
try:
command = commands[command_name]
except KeyError:
if command_name:
sys.exit(_("Unknown command: %s") % command_name)
else:
command = commands['help']
return command
[docs]def main():
"""The main function."""
try:
config.parse_args()
except RuntimeError as e:
sys.exit("ERROR: %s" % encodeutils.exception_to_unicode(e))
except SystemExit as e:
sys.exit("Please specify one command")
# Setup logging
logging.setup(CONF, 'glance')
if CONF.token:
CONF.slavetoken = CONF.token
CONF.mastertoken = CONF.token
command = lookup_command(CONF.command)
try:
command(CONF, CONF.args)
except TypeError as e:
LOG.error(_LE(command.__doc__) % {'prog': command.__name__}) # noqa
sys.exit("ERROR: %s" % encodeutils.exception_to_unicode(e))
except ValueError as e:
LOG.error(_LE(command.__doc__) % {'prog': command.__name__}) # noqa
sys.exit("ERROR: %s" % encodeutils.exception_to_unicode(e))
if __name__ == '__main__':
main()