739 lines
26 KiB
Python
Executable File
739 lines
26 KiB
Python
Executable File
#!/usr/bin/env python
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 Michael Still and Canonical Inc
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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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import gettext
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import httplib
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import json
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import logging
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import logging.config
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import logging.handlers
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import optparse
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import os
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import sys
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import urllib
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import uuid
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# If ../glance/__init__.py exists, add ../ to Python search path, so that
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# it will override what happens to be installed in /usr/(local/)lib/python...
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possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
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os.pardir,
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os.pardir))
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if os.path.exists(os.path.join(possible_topdir, 'glance', '__init__.py')):
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sys.path.insert(0, possible_topdir)
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gettext.install('glance', unicode=1)
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COMMANDS = """Commands:
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help <command> Output help for one of the commands below
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compare What is missing from the slave glance?
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dump Dump the contents of a glance instance to local disk.
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livecopy Load the contents of one glance instance into another.
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load Load the contents of a local directory into glance.
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size Determine the size of a glance instance if dumped to disk.
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"""
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IMAGE_ALREADY_PRESENT_MESSAGE = _('The image %s is already present on '
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'the slave, but our check for it did '
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'not find it. This indicates that we '
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'do not have permissions to see all '
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'the images on the slave server.')
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class AuthenticationException(Exception):
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pass
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class ImageAlreadyPresentException(Exception):
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pass
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class ServerErrorException(Exception):
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pass
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class UploadException(Exception):
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pass
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class ImageService(object):
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def __init__(self, conn, auth_token):
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""" Initialize the ImageService.
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conn: a httplib.HTTPConnection to the glance server
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auth_token: authentication token to pass in the x-auth-token header
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"""
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self.auth_token = auth_token
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self.conn = conn
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def _http_request(self, method, url, headers, body,
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ignore_result_body=False):
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"""Perform an HTTP request against the server.
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method: the HTTP method to use
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url: the URL to request (not including server portion)
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headers: headers for the request
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body: body to send with the request
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ignore_result_body: the body of the result will be ignored
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Returns: a httplib response object
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"""
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if self.auth_token:
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headers.setdefault('x-auth-token', self.auth_token)
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logging.debug(_('Request: %(method)s http://%(server)s:%(port)s'
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'%(url)s with headers %(headers)s')
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% {'method': method,
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'server': self.conn.host,
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'port': self.conn.port,
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'url': url,
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'headers': repr(headers)})
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self.conn.request(method, url, body, headers)
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response = self.conn.getresponse()
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headers = self._header_list_to_dict(response.getheaders())
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code = response.status
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code_description = httplib.responses[code]
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logging.debug(_('Response: %(code)s %(status)s %(headers)s')
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% {'code': code,
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'status': code_description,
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'headers': repr(headers)})
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if code in [400, 500]:
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raise ServerErrorException(response.read())
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if code in [401, 403]:
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raise AuthenticationException(response.read())
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if code == 409:
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raise ImageAlreadyPresentException(response.read())
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if ignore_result_body:
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# NOTE: because we are pipelining requests through a single HTTP
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# connection, httplib requires that we read the response body
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# before we can make another request. If the caller knows they
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# don't care about the body, they can ask us to do that for them.
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response.read()
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return response
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def get_images(self):
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"""Return a detailed list of images.
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Yields a series of images as dicts containing metadata.
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"""
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params = {'is_public': None}
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while True:
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url = '/v1/images/detail'
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query = urllib.urlencode(params)
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if query:
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url += '?%s' % query
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response = self._http_request('GET', url, {}, '')
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result = json.loads(response.read())
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if not result or not 'images' in result or not result['images']:
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return
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for image in result.get('images', []):
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params['marker'] = image['id']
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yield image
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def get_image(self, image_uuid):
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"""Fetch image data from glance.
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image_uuid: the id of an image
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Returns: a httplib Response object where the body is the image.
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"""
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url = '/v1/images/%s' % image_uuid
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return self._http_request('GET', url, {}, '')
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@staticmethod
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def _header_list_to_dict(headers):
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"""Expand a list of headers into a dictionary.
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headers: a list of [(key, value), (key, value), (key, value)]
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Returns: a dictionary representation of the list
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"""
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d = {}
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for (header, value) in headers:
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if header.startswith('x-image-meta-property-'):
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prop = header.replace('x-image-meta-property-', '')
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d.setdefault('properties', {})
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d['properties'][prop] = value
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else:
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d[header.replace('x-image-meta-', '')] = value
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return d
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def get_image_meta(self, image_uuid):
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"""Return the metadata for a single image.
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image_uuid: the id of an image
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Returns: image metadata as a dictionary
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"""
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url = '/v1/images/%s' % image_uuid
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response = self._http_request('HEAD', url, {}, '',
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ignore_result_body=True)
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return self._header_list_to_dict(response.getheaders())
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@staticmethod
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def _dict_to_headers(d):
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"""Convert a dictionary into one suitable for a HTTP request.
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d: a dictionary
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Returns: the same dictionary, with x-image-meta added to every key
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"""
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h = {}
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for key in d:
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if key == 'properties':
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for subkey in d[key]:
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h['x-image-meta-property-%s' % subkey] = d[key][subkey]
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else:
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h['x-image-meta-%s' % key] = d[key]
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return h
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def add_image(self, image_meta, image_data):
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"""Upload an image.
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image_meta: image metadata as a dictionary
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image_data: image data as a object with a read() method
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Returns: a tuple of (http response headers, http response body)
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"""
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url = '/v1/images'
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headers = self._dict_to_headers(image_meta)
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headers['Content-Type'] = 'application/octet-stream'
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headers['Content-Length'] = int(image_meta['size'])
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response = self._http_request('POST', url, headers, image_data)
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headers = self._header_list_to_dict(response.getheaders())
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logging.debug(_('Image post done'))
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body = response.read()
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return headers, body
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def add_image_meta(self, image_meta):
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"""Update image metadata.
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image_meta: image metadata as a dictionary
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Returns: a tuple of (http response headers, http response body)
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"""
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url = '/v1/images/%s' % image_meta['id']
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headers = self._dict_to_headers(image_meta)
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headers['Content-Type'] = 'application/octet-stream'
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response = self._http_request('PUT', url, headers, '')
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headers = self._header_list_to_dict(response.getheaders())
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logging.debug(_('Image post done'))
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body = response.read()
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return headers, body
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def get_image_service():
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"""Get a copy of the image service.
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This is done like this to make it easier to mock out ImageService.
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"""
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return ImageService
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def replication_size(options, args):
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"""%(prog)s size <server:port>
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Determine the size of a glance instance if dumped to disk.
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server:port: the location of the glance instance.
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"""
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server_port = args.pop()
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server, port = server_port.split(':')
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total_size = 0
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count = 0
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imageservice = get_image_service()
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client = imageservice(httplib.HTTPConnection(server, port),
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options.slavetoken)
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for image in client.get_images():
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logging.debug(_('Considering image: %(image)s') % {'image': image})
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if image['status'] == 'active':
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total_size += int(image['size'])
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count += 1
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print _('Total size is %d bytes across %d images') % (total_size, count)
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def replication_dump(options, args):
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"""%(prog)s dump <server:port> <path>
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Dump the contents of a glance instance to local disk.
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server:port: the location of the glance instance.
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path: a directory on disk to contain the data.
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"""
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path = args.pop()
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server_port = args.pop()
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server, port = server_port.split(':')
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imageservice = get_image_service()
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client = imageservice(httplib.HTTPConnection(server, port),
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options.mastertoken)
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for image in client.get_images():
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logging.info(_('Considering: %s' % image['id']))
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data_path = os.path.join(path, image['id'])
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if not os.path.exists(data_path):
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logging.info(_('... storing'))
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# Dump glance information
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with open(data_path, 'w') as f:
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f.write(json.dumps(image))
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if image['status'] == 'active' and not options.metaonly:
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# Now fetch the image. The metadata returned in headers here
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# is the same as that which we got from the detailed images
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# request earlier, so we can ignore it here. Note that we also
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# only dump active images.
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logging.info(_('... image is active'))
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image_response = client.get_image(image['id'])
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with open(data_path + '.img', 'wb') as f:
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while True:
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chunk = image_response.read(options.chunksize)
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if not chunk:
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break
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f.write(chunk)
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def _dict_diff(a, b):
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"""A one way dictionary diff.
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a: a dictionary
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b: a dictionary
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Returns: True if the dictionaries are different
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"""
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# Only things the master has which the slave lacks matter
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if set(a.keys()) - set(b.keys()):
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logging.debug(_('metadata diff -- master has extra keys: %(keys)s')
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% {'keys': ' '.join(set(a.keys()) - set(b.keys()))})
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return True
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for key in a:
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if str(a[key]) != str(b[key]):
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logging.debug(_('metadata diff -- value differs for key '
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'%(key)s: master "%(master_value)s" vs '
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'slave "%(slave_value)s"') %
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{'key': key, 'master_value': a[key],
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'slave_value': b[key]})
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return True
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return False
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# This is lifted from openstack-common, but copied here to reduce dependancies
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def is_uuid_like(value):
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try:
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uuid.UUID(value)
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return True
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except Exception:
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return False
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def replication_load(options, args):
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"""%(prog)s load <server:port> <path>
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Load the contents of a local directory into glance.
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server:port: the location of the glance instance.
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path: a directory on disk containing the data.
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"""
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path = args.pop()
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server_port = args.pop()
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server, port = server_port.split(':')
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imageservice = get_image_service()
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client = imageservice(httplib.HTTPConnection(server, port),
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options.slavetoken)
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updated = []
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for ent in os.listdir(path):
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if is_uuid_like(ent):
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image_uuid = ent
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logging.info(_('Considering: %s') % image_uuid)
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meta_file_name = os.path.join(path, image_uuid)
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with open(meta_file_name) as meta_file:
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meta = json.loads(meta_file.read())
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# Remove keys which don't make sense for replication
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for key in options.dontreplicate.split(' '):
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if key in meta:
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logging.debug(_('Stripping %(header)s from saved '
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'metadata'), {'header': key})
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del meta[key]
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if _image_present(client, image_uuid):
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# NOTE(mikal): Perhaps we just need to update the metadata?
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# Note that we don't attempt to change an image file once it
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# has been uploaded.
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logging.debug(_('Image %s already present'), image_uuid)
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headers = client.get_image_meta(image_uuid)
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for key in options.dontreplicate.split(' '):
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if key in headers:
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logging.debug(_('Stripping %(header)s from slave '
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'metadata'), {'header': key})
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del headers[key]
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if _dict_diff(meta, headers):
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logging.info(_('... metadata has changed'))
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headers, body = client.add_image_meta(meta)
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_check_upload_response_headers(headers, body)
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updated.append(meta['id'])
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else:
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if not os.path.exists(os.path.join(path, image_uuid + '.img')):
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logging.info(_('... dump is missing image data, skipping'))
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continue
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# Upload the image itself
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with open(os.path.join(path, image_uuid + '.img')) as img_file:
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try:
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headers, body = client.add_image(meta, img_file)
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_check_upload_response_headers(headers, body)
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updated.append(meta['id'])
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except ImageAlreadyPresentException:
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logging.error(IMAGE_ALREADY_PRESENT_MESSAGE
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% image_uuid)
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return updated
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def replication_livecopy(options, args):
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"""%(prog)s livecopy <fromserver:port> <toserver:port>
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Load the contents of one glance instance into another.
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fromserver:port: the location of the master glance instance.
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toserver:port: the location of the slave glance instance.
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"""
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imageservice = get_image_service()
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slave_server_port = args.pop()
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slave_server, slave_port = slave_server_port.split(':')
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slave_conn = httplib.HTTPConnection(slave_server, slave_port)
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slave_client = imageservice(slave_conn, options.slavetoken)
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master_server_port = args.pop()
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master_server, master_port = master_server_port.split(':')
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master_conn = httplib.HTTPConnection(master_server, master_port)
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master_client = imageservice(master_conn, options.mastertoken)
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updated = []
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for image in master_client.get_images():
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logging.info(_('Considering %(id)s') % {'id': image['id']})
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for key in options.dontreplicate.split(' '):
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if key in image:
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logging.debug(_('Stripping %(header)s from master metadata'),
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{'header': key})
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del image[key]
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if _image_present(slave_client, image['id']):
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# NOTE(mikal): Perhaps we just need to update the metadata?
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# Note that we don't attempt to change an image file once it
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# has been uploaded.
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headers = slave_client.get_image_meta(image['id'])
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if headers['status'] == 'active':
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for key in options.dontreplicate.split(' '):
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if key in image:
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logging.debug(_('Stripping %(header)s from master '
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'metadata'), {'header': key})
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del image[key]
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if key in headers:
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logging.debug(_('Stripping %(header)s from slave '
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'metadata'), {'header': key})
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del headers[key]
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if _dict_diff(image, headers):
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logging.info(_('... metadata has changed'))
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headers, body = slave_client.add_image_meta(image)
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_check_upload_response_headers(headers, body)
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updated.append(image['id'])
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elif image['status'] == 'active':
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logging.info(_('%s is being synced') % image['id'])
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if not options.metaonly:
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image_response = master_client.get_image(image['id'])
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try:
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headers, body = slave_client.add_image(image,
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image_response)
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_check_upload_response_headers(headers, body)
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updated.append(image['id'])
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except ImageAlreadyPresentException:
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logging.error(IMAGE_ALREADY_PRESENT_MESSAGE % image['id'])
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return updated
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def replication_compare(options, args):
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"""%(prog)s compare <fromserver:port> <toserver:port>
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Compare the contents of fromserver with those of toserver.
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fromserver:port: the location of the master glance instance.
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toserver:port: the location of the slave glance instance.
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"""
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imageservice = get_image_service()
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slave_server_port = args.pop()
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slave_server, slave_port = slave_server_port.split(':')
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slave_conn = httplib.HTTPConnection(slave_server, slave_port)
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slave_client = imageservice(slave_conn, options.slavetoken)
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master_server_port = args.pop()
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master_server, master_port = master_server_port.split(':')
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master_conn = httplib.HTTPConnection(master_server, master_port)
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master_client = imageservice(master_conn, options.mastertoken)
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differences = {}
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for image in master_client.get_images():
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if _image_present(slave_client, image['id']):
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headers = slave_client.get_image_meta(image['id'])
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for key in options.dontreplicate.split(' '):
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if key in image:
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logging.debug(_('Stripping %(header)s from master '
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'metadata'), {'header': key})
|
|
del image[key]
|
|
if key in headers:
|
|
logging.debug(_('Stripping %(header)s from slave '
|
|
'metadata'), {'header': key})
|
|
del headers[key]
|
|
|
|
for key in image:
|
|
if image[key] != headers.get(key, None):
|
|
logging.info(_('%(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:
|
|
logging.debug(_('%(image_id)s is identical')
|
|
% {'image_id': image['id']})
|
|
|
|
elif image['status'] == 'active':
|
|
logging.info(_('%s: entirely missing from the destination')
|
|
% image['id'])
|
|
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 = json.loads(body)
|
|
if 'image' in d and 'status' in d['image']:
|
|
return
|
|
|
|
except:
|
|
raise UploadException('Image upload problem: %s' % 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
|
|
|
|
|
|
def parse_options(parser, cli_args):
|
|
"""Returns the parsed CLI options, command to run and its arguments, merged
|
|
with any same-named options found in a configuration file
|
|
|
|
parser: the option parser
|
|
cli_args: the arguments passed on the command line
|
|
|
|
Returns: a tuple of (the parsed options, the command, the command name)
|
|
"""
|
|
if not cli_args:
|
|
cli_args.append('-h') # Show options in usage output...
|
|
|
|
(options, args) = parser.parse_args(cli_args)
|
|
|
|
# HACK(sirp): Make the parser available to the print_help method
|
|
# print_help is a command, so it only accepts (options, args); we could
|
|
# one-off have it take (parser, options, args), however, for now, I think
|
|
# this little hack will suffice
|
|
options.__parser = parser
|
|
|
|
if not args:
|
|
parser.print_usage()
|
|
sys.exit(0)
|
|
|
|
command_name = args.pop(0)
|
|
command = lookup_command(parser, command_name)
|
|
|
|
return (options, command, args)
|
|
|
|
|
|
def print_help(options, args):
|
|
"""Print help specific to a command.
|
|
|
|
options: the parsed command line options
|
|
args: the command line
|
|
"""
|
|
if len(args) != 1:
|
|
print COMMANDS
|
|
sys.exit(1)
|
|
|
|
parser = options.__parser
|
|
command_name = args.pop()
|
|
command = lookup_command(parser, command_name)
|
|
|
|
print command.__doc__ % {'prog': os.path.basename(sys.argv[0])}
|
|
|
|
|
|
def lookup_command(parser, command_name):
|
|
"""Lookup a command.
|
|
|
|
parser: the command parser
|
|
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:
|
|
parser.print_usage()
|
|
sys.exit(_("Unknown command: %s") % command_name)
|
|
|
|
return command
|
|
|
|
|
|
if __name__ == '__main__':
|
|
usage = """
|
|
%%prog <command> [options] [args]
|
|
|
|
%s
|
|
""" % COMMANDS
|
|
|
|
oparser = optparse.OptionParser(version='%%prog',
|
|
usage=usage.strip())
|
|
|
|
# Options
|
|
oparser.add_option('-c', '--chunksize', action="store", default=65536,
|
|
help="Amount of data to transfer per HTTP write")
|
|
oparser.add_option('-d', '--debug', action="store_true", default=False,
|
|
help="Print debugging information")
|
|
oparser.add_option('-D', '--dontreplicate', action="store",
|
|
default=('created_at date deleted_at location '
|
|
'updated_at'),
|
|
help="List of fields to not replicate")
|
|
oparser.add_option('-m', '--metaonly', action="store_true", default=False,
|
|
help="Only replicate metadata, not images")
|
|
oparser.add_option('-l', '--logfile', action="store", default='',
|
|
help="Path of file to log to")
|
|
oparser.add_option('-s', '--syslog', action="store_true", default=False,
|
|
help="Log to syslog instead of a file")
|
|
oparser.add_option('-t', '--token', action="store", 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."))
|
|
oparser.add_option('-M', '--mastertoken', action="store", default='',
|
|
help=("Pass in your authentication token if you have "
|
|
"one. This is the token used for the master."))
|
|
oparser.add_option('-S', '--slavetoken', action="store", default='',
|
|
help=("Pass in your authentication token if you have "
|
|
"one. This is the token used for the slave."))
|
|
oparser.add_option('-v', '--verbose', action="store_true", default=False,
|
|
help="Print more verbose output")
|
|
|
|
(options, command, args) = parse_options(oparser, sys.argv[1:])
|
|
|
|
# Setup logging
|
|
root_logger = logging.root
|
|
if options.debug:
|
|
root_logger.setLevel(logging.DEBUG)
|
|
elif options.verbose:
|
|
root_logger.setLevel(logging.INFO)
|
|
else:
|
|
root_logger.setLevel(logging.WARNING)
|
|
|
|
formatter = logging.Formatter()
|
|
|
|
if options.syslog:
|
|
handler = logging.handlers.SysLogHandler(address='/dev/log')
|
|
elif options.logfile:
|
|
handler = logging.handlers.WatchedFileHandler(options.logfile)
|
|
else:
|
|
handler = logging.StreamHandler(sys.stdout)
|
|
|
|
if options.token:
|
|
options.slavetoken = options.token
|
|
options.mastertoken = options.token
|
|
|
|
handler.setFormatter(formatter)
|
|
root_logger.addHandler(handler)
|
|
|
|
command(options, args)
|