Fix Broken XML Namespace Handling

nodeName is set to ns2:metadata and not just metadata when namespaces are
specified using first example in the defect. Explicitly check namespaces
where necessary and use localName instead of nodeName.
Ensure that scheduler_hints are picked up from the correct namespace

fix lines too long from pep8

Fixes bug 887191

Change-Id: I5db2b575d24f6b1b358489e309af7e6ace2950fd

nova/api/openstack/compute/servers.py

@@ -241,13 +241,9 @@ class CommonDeserializer(wsgi.MetadataXMLDeserializer):
 
     def _extract_scheduler_hints(self, server_node):
         """Marshal the scheduler hints attribute of a parsed request"""
-        node = self.find_first_child_named(server_node,
-                                           "OS-SCH-HNT:scheduler_hints")
-        # NOTE(vish): Support the os: prefix because it is what we use
-        #             for json, even though OS-SCH-HNT: is more correct
-        if not node:
-            node = self.find_first_child_named(server_node,
-                                               "os:scheduler_hints")
+        node = self.find_first_child_named_in_namespace(server_node,
+            "http://docs.openstack.org/compute/ext/scheduler-hints/api/v2",
+            "scheduler_hints")
         if node:
             scheduler_hints = {}
             for child in self.extract_elements(node):

nova/api/openstack/wsgi.py

@@ -244,17 +244,26 @@ class XMLDeserializer(TextDeserializer):
                                                                  listnames)
             return result
 
+    def find_first_child_named_in_namespace(self, parent, namespace, name):
+        """Search a nodes children for the first child with a given name"""
+        for node in parent.childNodes:
+            if (node.localName == name and
+                node.namespaceURI and
+                node.namespaceURI == namespace):
+                return node
+        return None
+
     def find_first_child_named(self, parent, name):
         """Search a nodes children for the first child with a given name"""
         for node in parent.childNodes:
-            if node.nodeName == name:
+            if node.localName == name:
                 return node
         return None
 
     def find_children_named(self, parent, name):
         """Return all of a nodes children who have the given name"""
         for node in parent.childNodes:
-            if node.nodeName == name:
+            if node.localName == name:
                 yield node
 
     def extract_text(self, node):

nova/tests/api/openstack/compute/test_servers.py

@@ -3030,6 +3030,57 @@ class TestServerCreateRequestXMLDeserializer(test.TestCase):
         }
         self.assertEquals(request['body'], expected)
 
+    def test_request_with_alternate_namespace_prefix(self):
+        serial_request = """
+<ns2:server xmlns:ns2="http://docs.openstack.org/compute/api/v2"
+        name="new-server-test"
+        imageRef="1"
+        flavorRef="2">
+        <ns2:metadata><ns2:meta key="hello">world</ns2:meta></ns2:metadata>
+        </ns2:server>
+        """
+        request = self.deserializer.deserialize(serial_request)
+        expected = {
+            "server": {
+                "name": "new-server-test",
+                "imageRef": "1",
+                "flavorRef": "2",
+                'metadata': {"hello": "world"},
+                },
+            }
+        self.assertEquals(request['body'], expected)
+
+    def test_request_with_scheduler_hints_and_alternate_namespace_prefix(self):
+        serial_request = """
+<ns2:server xmlns:ns2="http://docs.openstack.org/compute/api/v2"
+     name="new-server-test"
+     imageRef="1"
+     flavorRef="2">
+     <ns2:metadata><ns2:meta key="hello">world</ns2:meta></ns2:metadata>
+     <os:scheduler_hints
+     xmlns:os="http://docs.openstack.org/compute/ext/scheduler-hints/api/v2">
+             <hypervisor>xen</hypervisor>
+             <near>eb999657-dd6b-464e-8713-95c532ac3b18</near>
+     </os:scheduler_hints>
+     </ns2:server>
+        """
+        request = self.deserializer.deserialize(serial_request)
+        expected = {
+            "server": {
+                'OS-SCH-HNT:scheduler_hints': {
+                    'hypervisor': ['xen'],
+                    'near': ['eb999657-dd6b-464e-8713-95c532ac3b18']
+                },
+                "name": "new-server-test",
+                "imageRef": "1",
+                "flavorRef": "2",
+                "metadata": {
+                    "hello": "world"
+                }
+            }
+        }
+        self.assertEquals(request['body'], expected)
+
     def test_access_ipv4(self):
         serial_request = """
 <server xmlns="http://docs.openstack.org/compute/api/v2"