Reintroduces EC2 metadata service
Adds a refactored version of the EC2 metadata service removed in a previous commit.
This commit is contained in:
Alessandro Pilotti
parent
88c01baab6
commit
654334975c
@ -25,6 +25,7 @@ opts = [
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default=[
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'cloudbaseinit.metadata.services.httpservice.HttpService',
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'cloudbaseinit.metadata.services.configdrive.ConfigDriveService',
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'cloudbaseinit.metadata.services.ec2service.EC2Service',
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'cloudbaseinit.metadata.services.maasservice.MaaSHttpService'
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],
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help='List of enabled metadata service classes, '
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102
cloudbaseinit/metadata/services/ec2service.py
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102
cloudbaseinit/metadata/services/ec2service.py
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@ -0,0 +1,102 @@
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# Copyright 2014 Cloudbase Solutions Srl
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# Copyright 2012 Mirantis Inc.
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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 posixpath
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import urllib2
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from oslo.config import cfg
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from cloudbaseinit.metadata.services import base
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from cloudbaseinit.openstack.common import log as logging
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from cloudbaseinit.utils import network
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opts = [
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cfg.StrOpt('ec2_metadata_base_url',
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default='http://169.254.169.254/',
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help='The base URL where the service looks for metadata'),
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]
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CONF = cfg.CONF
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CONF.register_opts(opts)
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LOG = logging.getLogger(__name__)
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class EC2Service(base.BaseMetadataService):
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_metadata_version = '2009-04-04'
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def __init__(self):
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super(EC2Service, self).__init__()
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self._enable_retry = True
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def load(self):
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super(EC2Service, self).load()
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network.check_metadata_ip_route(CONF.ec2_metadata_base_url)
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try:
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self._get_data('latest/meta-data/')
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return True
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except Exception, ex:
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LOG.exception(ex)
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LOG.debug('Metadata not found at URL \'%s\'' %
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CONF.ec2_metadata_base_url)
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return False
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def _get_response(self, req):
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try:
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return urllib2.urlopen(req)
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except urllib2.HTTPError as ex:
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if ex.code == 404:
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raise base.NotExistingMetadataException()
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else:
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raise
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def _get_data(self, path):
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norm_path = posixpath.join(CONF.ec2_metadata_base_url, path)
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LOG.debug('Getting metadata from: %(norm_path)s',
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{'norm_path': norm_path})
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req = urllib2.Request(norm_path)
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response = self._get_response(req)
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return response.read()
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def get_host_name(self):
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return self._get_cache_data('%s/meta-data/local-hostname' %
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self._metadata_version)
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def get_instance_id(self):
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return self._get_cache_data('%s/meta-data/instance-id' %
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self._metadata_version)
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def get_public_keys(self):
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ssh_keys = []
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keys_info = self._get_cache_data(
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'%s/meta-data/public-keys' %
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self._metadata_version).split("\n")
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for key_info in keys_info:
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(idx, key_name) = key_info.split('=')
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ssh_key = self._get_cache_data(
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'%(version)s/meta-data/public-keys/%(idx)s/openssh-key' %
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{'version': self._metadata_version, 'idx': idx})
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ssh_keys.append(ssh_key)
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return ssh_keys
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def get_network_config(self):
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# TODO(alexpilotti): add static network support
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pass
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@ -16,14 +16,13 @@
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import posixpath
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import urllib2
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import urlparse
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from oslo.config import cfg
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from cloudbaseinit.metadata.services import base
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from cloudbaseinit.metadata.services import baseopenstackservice
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from cloudbaseinit.openstack.common import log as logging
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from cloudbaseinit.osutils import factory as osutils_factory
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from cloudbaseinit.utils import network
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opts = [
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cfg.StrOpt('metadata_base_url', default='http://169.254.169.254/',
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@ -43,36 +42,9 @@ class HttpService(baseopenstackservice.BaseOpenStackService):
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super(HttpService, self).__init__()
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self._enable_retry = True
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def _check_metadata_ip_route(self):
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'''
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Workaround for: https://bugs.launchpad.net/quantum/+bug/1174657
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'''
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osutils = osutils_factory.get_os_utils()
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if osutils.check_os_version(6, 0):
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# 169.254.x.x addresses are not getting routed starting from
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# Windows Vista / 2008
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metadata_netloc = urlparse.urlparse(CONF.metadata_base_url).netloc
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metadata_host = metadata_netloc.split(':')[0]
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if metadata_host.startswith("169.254."):
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if not osutils.check_static_route_exists(metadata_host):
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(interface_index, gateway) = osutils.get_default_gateway()
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if gateway:
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try:
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osutils.add_static_route(metadata_host,
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"255.255.255.255",
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gateway,
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interface_index,
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10)
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except Exception, ex:
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# Ignore it
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LOG.exception(ex)
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def load(self):
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super(HttpService, self).load()
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self._check_metadata_ip_route()
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network.check_metadata_ip_route(CONF.metadata_base_url)
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try:
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self._get_meta_data()
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50
cloudbaseinit/utils/network.py
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50
cloudbaseinit/utils/network.py
Normal file
@ -0,0 +1,50 @@
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# Copyright 2012 Cloudbase Solutions Srl
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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 sys
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import urlparse
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from cloudbaseinit.openstack.common import log as logging
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from cloudbaseinit.osutils import factory as osutils_factory
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LOG = logging.getLogger(__name__)
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def check_metadata_ip_route(metadata_url):
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'''
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Workaround for: https://bugs.launchpad.net/quantum/+bug/1174657
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'''
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osutils = osutils_factory.get_os_utils()
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if sys.platform == 'win32' and osutils.check_os_version(6, 0):
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# 169.254.x.x addresses are not getting routed starting from
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# Windows Vista / 2008
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metadata_netloc = urlparse.urlparse(metadata_url).netloc
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metadata_host = metadata_netloc.split(':')[0]
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if metadata_host.startswith("169.254."):
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if not osutils.check_static_route_exists(metadata_host):
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(interface_index, gateway) = osutils.get_default_gateway()
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if gateway:
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try:
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LOG.debug('Setting gateway for host: %s',
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metadata_host)
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osutils.add_static_route(metadata_host,
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"255.255.255.255",
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gateway,
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interface_index,
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10)
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except Exception, ex:
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# Ignore it
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LOG.exception(ex)
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