101 lines
3.1 KiB
Python
101 lines
3.1 KiB
Python
# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import calendar
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import json
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import time
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from oslo_config import cfg
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from oslo_log import log
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from os_collect_config import common
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from os_collect_config import exc
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from os_collect_config import merger
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CONF = cfg.CONF
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logger = log.getLogger(__name__)
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opts = [
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cfg.StrOpt('metadata-url',
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help='URL to query for metadata'),
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cfg.FloatOpt('timeout', default=10,
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help='Seconds to wait for the connection and read request'
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' timeout.')
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]
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name = 'request'
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class Collector(object):
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def __init__(self, requests_impl=common.requests):
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self._requests_impl = requests_impl
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self._session = requests_impl.Session()
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self.last_modified = None
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def check_fetch_content(self, headers):
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'''Raises RequestMetadataNotAvailable if metadata should not be
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fetched.
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'''
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# no last-modified header, so fetch
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lm = headers.get('last-modified')
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if not lm:
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return
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last_modified = calendar.timegm(
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time.strptime(lm, '%a, %d %b %Y %H:%M:%S %Z'))
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# first run, so fetch
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if not self.last_modified:
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return last_modified
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if last_modified < self.last_modified:
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logger.warn(
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'Last-Modified is older than previous collection')
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if last_modified <= self.last_modified:
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raise exc.RequestMetadataNotAvailable
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return last_modified
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def collect(self):
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if CONF.request.metadata_url is None:
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logger.info('No metadata_url configured.')
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raise exc.RequestMetadataNotConfigured
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url = CONF.request.metadata_url
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timeout = CONF.request.timeout
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final_content = {}
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try:
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head = self._session.head(url, timeout=timeout)
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last_modified = self.check_fetch_content(head.headers)
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content = self._session.get(url, timeout=timeout)
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content.raise_for_status()
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self.last_modified = last_modified
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except self._requests_impl.exceptions.RequestException as e:
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logger.warn(e)
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raise exc.RequestMetadataNotAvailable
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try:
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value = json.loads(content.text)
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except ValueError as e:
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logger.warn(
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'Failed to parse as json. (%s)' % e)
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raise exc.RequestMetadataNotAvailable
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final_content.update(value)
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final_list = merger.merged_list_from_content(
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final_content, cfg.CONF.deployment_key, name)
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return final_list
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