heat api : add waitcondition to cfn api

Add a new path to the CFN api, which implements CFN style waitcondition
notification - this means we can move away from the separate heat-metadata
service for this purpose, instead using the authenticated CFN API

blueprint metsrv-remove
Change-Id: I62cff7cb4c7a009fea2c8f62ea446d8d758f5429
Signed-off-by: Steven Hardy <shardy@redhat.com>

heat/api/cfn/v1/__init__.py

@@ -18,6 +18,7 @@ import routes
 from webob import Request
 
 from heat.api.cfn.v1 import stacks
+from heat.api.cfn.v1 import waitcondition
 from heat.common import wsgi
 from heat.openstack.common import log as logging
 
@@ -70,4 +71,13 @@ class API(wsgi.Router):
 
         mapper.connect("/", controller=stacks_resource, action="index")
 
+        # Add controller which handles waitcondition notifications
+        # This is not part of the main CFN API spec, hence handle it
+        # separately via a different path
+        waitcondition_controller = waitcondition.create_resource(conf)
+        mapper.connect('/waitcondition/:stack_id/resources/:resource_name',
+                       controller=waitcondition_controller,
+                       action='update_waitcondition',
+                       conditions=dict(method=['PUT']))
+
         super(API, self).__init__(mapper)

heat/api/cfn/v1/waitcondition.py

@@ -0,0 +1,71 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+#
+#    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 json
+
+from webob.exc import Response
+
+from heat.common import wsgi
+from heat.common import context
+from heat.engine import rpcapi as engine_rpcapi
+from heat.openstack.common import rpc
+
+
+def json_response(http_status, data):
+    """Create a JSON response with a specific HTTP code."""
+    response = Response(json.dumps(data))
+    response.status = http_status
+    response.content_type = 'application/json'
+    return response
+
+
+def json_error(http_status, message):
+    """Create a JSON error response."""
+    body = {'error': message}
+    return json_response(http_status, body)
+
+
+class WaitConditionController:
+    def __init__(self, options):
+        self.options = options
+        self.engine_rpcapi = engine_rpcapi.EngineAPI()
+
+    def update_waitcondition(self, req, body, stack_id, resource_name):
+        con = req.context
+        [error, metadata] = self.engine_rpcapi.metadata_update(con,
+                                 stack_id=stack_id,
+                                 resource_name=resource_name,
+                                 metadata=body)
+        if error:
+            if error == 'stack':
+                return json_error(404,
+                        'The stack "%s" does not exist.' % stack_id)
+            else:
+                return json_error(404,
+                        'The resource "%s" does not exist.' % resource_name)
+        return json_response(201, {
+            'resource': resource_name,
+            'metadata': body,
+        })
+
+
+def create_resource(options):
+    """
+    Stacks resource factory method.
+    """
+    deserializer = wsgi.JSONRequestDeserializer()
+    serializer = wsgi.JSONResponseSerializer()
+    return wsgi.Resource(WaitConditionController(options), deserializer,
+                         serializer)