fix update neutron resource with incorrect body key server return 500

In current neutron, when I update resource with incorrect body, neutron
server return 500 NeutronError. It should be fixed and BadRequest (400)
should be returned.
This patch fixed it.

Change-Id: I024b8ef73be69af069e4516dc501df3f5c145419
Partial-bug: #1838587

neutron/pecan_wsgi/controllers/resource.py

@@ -59,6 +59,10 @@ class ItemController(utils.NeutronPecanController):
     @utils.when(index, method='PUT')
     def put(self, *args, **kwargs):
         neutron_context = request.context['neutron_context']
+        if "resources" not in request.context:
+            msg = (_("Unable to find '%s' in request body") %
+                   request.context['resource'])
+            raise webob.exc.HTTPBadRequest(msg)
         resources = request.context['resources']
         # Bulk update is not supported, 'resources' always contains a single
         # elemenet

neutron/tests/unit/plugins/ml2/test_plugin.py

@@ -501,6 +501,26 @@ class TestMl2NetworksV2(test_plugin.TestNetworksV2,
                  portbindings.VIF_TYPE_BINDING_FAILED],
                 negative_search=True)
 
+    def test_update_network_with_empty_body(self):
+        with self.network() as network:
+            network_id = network["network"]["id"]
+            network_req = self.new_update_request("networks", None,
+                                                  network_id)
+            res = network_req.get_response(self.api)
+            self.assertEqual(webob.exc.HTTPBadRequest.code, res.status_int)
+            self.assertIn("network", res.json['NeutronError']['message'])
+
+    def test_update_network_with_incorrect_resource_body(self):
+        with self.network() as network:
+            network_id = network["network"]["id"]
+            incorrect_body = {"incorrect": {}}
+            network_req = self.new_update_request("networks",
+                                                  incorrect_body,
+                                                  network_id)
+            res = network_req.get_response(self.api)
+            self.assertEqual(webob.exc.HTTPBadRequest.code, res.status_int)
+            self.assertIn("network", res.json['NeutronError']['message'])
+
 
 class TestMl2NetworksV2AgentMechDrivers(Ml2PluginV2TestCase):
 
@@ -707,6 +727,25 @@ class TestMl2SubnetsV2(test_plugin.TestSubnetsV2,
                     self.assertEqual(s3['subnet']['id'],
                                      port['fixed_ips'][0]['subnet_id'])
 
+    def test_update_subnet_with_empty_body(self):
+        with self.subnet() as subnet:
+            subnet_id = subnet["subnet"]["id"]
+            subnet_req = self.new_update_request("subnets", None,
+                                                 subnet_id)
+            res = subnet_req.get_response(self.api)
+            self.assertEqual(webob.exc.HTTPBadRequest.code, res.status_int)
+            self.assertIn("subnet", res.json['NeutronError']['message'])
+
+    def test_update_subnet_with_incorrect_resource_body(self):
+        with self.subnet() as subnet:
+            subnet_id = subnet["subnet"]["id"]
+            incorrect_body = {"incorrect": {}}
+            subnet_req = self.new_update_request("subnets", incorrect_body,
+                                                 subnet_id)
+            res = subnet_req.get_response(self.api)
+            self.assertEqual(webob.exc.HTTPBadRequest.code, res.status_int)
+            self.assertIn("subnet", res.json['NeutronError']['message'])
+
     def test_subnet_after_update_callback(self):
         after_update = mock.Mock()
         registry.subscribe(after_update, resources.SUBNET, events.AFTER_UPDATE)
@@ -1077,6 +1116,24 @@ class TestMl2PortsV2(test_plugin.TestPortsV2, Ml2PluginV2TestCase):
                 res_ports = self._list('ports')['ports']
                 self.assertEqual([], res_ports)
 
+    def test_update_port_with_empty_body(self):
+        with self.port() as port:
+            port_id = port["port"]["id"]
+            port_req = self.new_update_request("ports", None, port_id)
+            res = port_req.get_response(self.api)
+            self.assertEqual(webob.exc.HTTPBadRequest.code, res.status_int)
+            self.assertIn("port", res.json['NeutronError']['message'])
+
+    def test_update_port_with_incorrect_resource_body(self):
+        with self.port() as port:
+            port_id = port["port"]["id"]
+            incorrect_body = {"incorrect": {}}
+            port_req = self.new_update_request("ports", incorrect_body,
+                                               port_id)
+            res = port_req.get_response(self.api)
+            self.assertEqual(webob.exc.HTTPBadRequest.code, res.status_int)
+            self.assertIn("port", res.json['NeutronError']['message'])
+
     def test_update_port_status_build(self):
         with self.port() as port:
             self.assertEqual('DOWN', port['port']['status'])