Scott Moser
55128d1c5d
The changes here are coming as a result of starting on blueprint config-drive-v2 [1]. I wanted to separate out the "Metadata" from the "Metadata Server". Thus, the creation of nova/api/metadata/base.py. The InstanceMetadata in base.py contains most of the logic for presenting metadata. As a result, the Metadata webservice in handler.py greatly simplified. This should make it easier to render duplicate data to a config drive. Additional changes here: * a few more tests * removal of the separate 'Versions' handler. Its now replaced by the single handler. Change-Id: I35fcfd8d7f247763954afc0a9f752f629b243e9b
89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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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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"""Metadata request handler."""
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import webob.dec
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import webob.exc
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from nova.api.metadata import base
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from nova import exception
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from nova import flags
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from nova import log as logging
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from nova import wsgi
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LOG = logging.getLogger(__name__)
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FLAGS = flags.FLAGS
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flags.DECLARE('use_forwarded_for', 'nova.api.auth')
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if FLAGS.memcached_servers:
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import memcache
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else:
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from nova.common import memorycache as memcache
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class MetadataRequestHandler(wsgi.Application):
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"""Serve metadata."""
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def __init__(self):
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self._cache = memcache.Client(FLAGS.memcached_servers, debug=0)
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def get_metadata(self, address):
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if not address:
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raise exception.FixedIpNotFoundForAddress(address=address)
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cache_key = 'metadata-%s' % address
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data = self._cache.get(cache_key)
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if data:
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return data
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try:
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data = base.get_metadata_by_address(address)
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except exception.NotFound:
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return None
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self._cache.set(cache_key, data, 15)
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return data
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@webob.dec.wsgify(RequestClass=wsgi.Request)
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def __call__(self, req):
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remote_address = req.remote_addr
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if FLAGS.use_forwarded_for:
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remote_address = req.headers.get('X-Forwarded-For', remote_address)
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try:
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meta_data = self.get_metadata(remote_address)
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except Exception:
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LOG.exception(_('Failed to get metadata for ip: %s'),
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remote_address)
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msg = _('An unknown error has occurred. '
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'Please try your request again.')
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exc = webob.exc.HTTPInternalServerError(explanation=unicode(msg))
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return exc
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if meta_data is None:
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LOG.error(_('Failed to get metadata for ip: %s'), remote_address)
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raise webob.exc.HTTPNotFound()
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try:
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data = meta_data.lookup(req.path_info)
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except base.InvalidMetadataPath:
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raise webob.exc.HTTPNotFound()
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return base.ec2_md_print(data)
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