HTTP metadata service support

cloudbaseinit/metadata/factory.py

@@ -15,12 +15,14 @@
 #    under the License.
 
 from cloudbaseinit.openstack.common import cfg
+from cloudbaseinit.openstack.common import log as logging
 from cloudbaseinit.utils import *
 
 opts = [
     cfg.ListOpt('metadata_services', default=[
         'cloudbaseinit.metadata.services.configdrive.configdrive.'
-            'ConfigDriveService'
+            'ConfigDriveService',
+        'cloudbaseinit.metadata.services.httpservice.HttpService',
         ],
         help='List of enabled metadata service classes, '
             'to be tested fro availability in the provided order. '
@@ -29,6 +31,7 @@ opts = [
 
 CONF = cfg.CONF
 CONF.register_opts(opts)
+LOG = logging.getLogger(__name__)
 
 
 class MetadataServiceFactory(object):
@@ -37,6 +40,11 @@ class MetadataServiceFactory(object):
         utils = Utils()
         for class_path in CONF.metadata_services:
             service = utils.load_class(class_path)()
+            try:
                 if service.load():
                     return service
+            except Exception, ex:
+                LOG.error('Failed to load metadata service \'%(class_path)s\' '
+                    'with error: %(ex)s'%
+                    locals())
         raise Exception("No available service found")

cloudbaseinit/metadata/services/configdrive/manager.py

@@ -48,7 +48,7 @@ class ConfigDriveManager(object):
             q1 = conn.query('SELECT Label FROM Win32_Volume WHERE Name = \'%(drive)s\'' % locals())
             for r1 in q1:
                 if r1.Label == "config-2" and \
-                    os.path.exists(os.path.join(drive, 'openstack\\latest\meta_data.json')):
+                    os.path.exists(os.path.join(drive, 'openstack\\latest\\meta_data.json')):
                     return drive
         return None
 

cloudbaseinit/metadata/services/httpservice.py

@@ -0,0 +1,50 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2012 Cloudbase Solutions Srl
+#
+#    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.
+
+import logging
+import posixpath
+import urllib2
+
+from cloudbaseinit.metadata.services.base import *
+from cloudbaseinit.openstack.common import cfg
+
+opts = [
+    cfg.StrOpt('metadata_base_url', default='http://169.254.169.254/',
+        help='The base URL where the service looks for metadata'),
+  ]
+
+CONF = cfg.CONF
+CONF.register_opts(opts)
+
+LOG = logging.getLogger(__name__)
+
+class HttpService(BaseMetadataService):
+    def load(self):
+        super(HttpService, self).load()
+        try:
+            self.get_meta_data('openstack')
+            return True
+        except:
+            LOG.debug('Metadata not found at URL \'%s\'' %
+                CONF.metadata_base_url)
+            return False
+
+    def _get_data(self, path):
+        norm_path = posixpath.join(CONF.metadata_base_url, path)
+        LOG.debug('Getting metadata from: %(norm_path)s' % locals())
+        req = urllib2.Request(norm_path)
+        response = urllib2.urlopen(req)
+        return response.read()