Use parent's project id in the quota enforcement for some resources

Some of the resources, like e.g. QoS rules don't have tenant or
project_id attribute as they belong to the project to which QoS policy
(their parent) belongs to.
Because of that we should get project id for such resources from their
parent object instead of looking for it in its attributes.

Related-Bug: #2022043
Change-Id: I3e6625eb237ad442ab904f59de5c2959d4090700

neutron/pecan_wsgi/hooks/quota_enforcement.py

@@ -15,12 +15,14 @@
 
 import collections
 
+from neutron_lib import context
 from neutron_lib.db import api as db_api
 from neutron_lib import exceptions
 from oslo_log import log as logging
 from pecan import hooks
 
 from neutron import manager
+from neutron.pecan_wsgi.hooks import utils
 from neutron import quota
 from neutron.quota import resource_registry
 
@@ -38,8 +40,19 @@ class QuotaEnforcementHook(hooks.PecanHook):
         if state.request.method != 'POST' or not resource or not items:
             return
         plugin = manager.NeutronManager.get_plugin_for_resource(collection)
+        parent_id = state.request.context.get('parent_id')
+        parent_project_id = None
+        if parent_id and any(not x.get('tenant_id') for x in items):
+            parent_getter = getattr(
+                plugin, 'get_%s' % utils.get_controller(state).parent)
+            try:
+                parent_project_id = parent_getter(
+                    context.get_admin_context(), parent_id).get('project_id')
+            except exceptions.NotFound:
+                pass
         # Store requested resource amounts grouping them by tenant
-        deltas = collections.Counter(map(lambda x: x['tenant_id'], items))
+        deltas = collections.Counter(
+            map(lambda x: x.get('tenant_id', parent_project_id), items))
         # Perform quota enforcement
         reservations = []
         neutron_context = state.request.context.get('neutron_context')