Merge "Use a joined relationship for AZ info on routers"

neutron/db/availability_zone/router.py

@@ -29,7 +29,7 @@ class RouterAvailabilityZoneMixin(l3_attrs_db.ExtraAttributesMixin):
         router_res[az_ext.AZ_HINTS] = az_ext.convert_az_string_to_list(
             router_res[az_ext.AZ_HINTS])
         router_res['availability_zones'] = (
-            self.get_router_availability_zones(router_db['id']))
+            self.get_router_availability_zones(router_db))
 
     def _process_extra_attr_router_create(
         self, context, router_db, router_req):

neutron/db/l3_agentschedulers_db.py

@@ -31,7 +31,6 @@ from neutron.common import utils as n_utils
 from neutron import context as n_ctx
 from neutron.db import agents_db
 from neutron.db import agentschedulers_db
-from neutron.db import api as db_api
 from neutron.db import l3_attrs_db
 from neutron.db import model_base
 from neutron.extensions import l3agentscheduler
@@ -563,12 +562,5 @@ class AZL3AgentSchedulerDbMixin(L3AgentSchedulerDbMixin,
                                 router_az.RouterAvailabilityZonePluginBase):
     """Mixin class to add availability_zone supported l3 agent scheduler."""
 
-    def get_router_availability_zones(self, router_id):
+    def get_router_availability_zones(self, router):
-        session = db_api.get_session()
+        return list({agent.availability_zone for agent in router.l3_agents})
-        with session.begin():
-            query = session.query(agents_db.Agent.availability_zone)
-            query = query.join(RouterL3AgentBinding)
-            query = query.filter(
-                RouterL3AgentBinding.router_id == router_id)
-            query = query.group_by(agents_db.Agent.availability_zone)
-            return [item[0] for item in query]

neutron/db/l3_db.py

@@ -91,6 +91,8 @@ class Router(model_base.HasStandardAttributes, model_base.BASEV2,
         RouterPort,
         backref='router',
         lazy='dynamic')
+    l3_agents = orm.relationship('Agent', lazy='joined', viewonly=True,
+                                 secondary='routerl3agentbindings')
 
 
 class FloatingIP(model_base.HasStandardAttributes, model_base.BASEV2,

neutron/extensions/router_availability_zone.py

@@ -64,5 +64,5 @@ class Router_availability_zone(extensions.ExtensionDescriptor):
 class RouterAvailabilityZonePluginBase(object):
 
     @abc.abstractmethod
-    def get_router_availability_zones(self, router_id):
+    def get_router_availability_zones(self, router):
         """Return availability zones which a router belongs to."""