Add neutron-api-plugin relation and use it to dictate neutron settings liek l2_population

config.yaml

@@ -102,10 +102,3 @@ options:
       .
       This network will be used for tenant network traffic in overlay
       networks.
-  l2-population:
-    type: boolean
-    default: True
-    description: |
-      Populate the forwarding tables of virtual switches (LinuxBridge or OVS),
-      to decrease broadcast traffics inside the physical networks fabric while
-      using overlays networks (VXLan, GRE).

hooks/neutron-plugin-api-relation-broken

@@ -0,0 +1 @@
+quantum_hooks.py

hooks/neutron-plugin-api-relation-changed

@@ -0,0 +1 @@
+quantum_hooks.py

hooks/neutron-plugin-api-relation-departed

@@ -0,0 +1 @@
+quantum_hooks.py

hooks/neutron-plugin-api-relation-joined

@@ -0,0 +1 @@
+quantum_hooks.py

hooks/quantum_contexts.py

@@ -100,6 +100,27 @@ def core_plugin():
         return CORE_PLUGIN[networking_name()][plugin]
 
 
+def _neutron_api_settings():
+    '''
+    Inspects current neutron-plugin-api relation for neutron settings. Return
+    defaults if it is not present
+    '''
+    neutron_settings = {
+        'l2_population': True,
+
+    }
+    for rid in relation_ids('neutron-plugin-api'):
+        for unit in related_units(rid):
+            rdata = relation_get(rid=rid, unit=unit)
+            if 'l2-population' not in rdata:
+                continue
+            neutron_settings = {
+                'l2_population': rdata['l2-population'],
+            }
+            return neutron_settings
+    return neutron_settings
+
+
 class NetworkServiceContext(OSContextGenerator):
     interfaces = ['quantum-network-service']
 
@@ -181,6 +202,7 @@ class ExternalPortContext(OSContextGenerator):
 class QuantumGatewayContext(OSContextGenerator):
 
     def __call__(self):
+        neutron_api_settings = _neutron_api_settings()
         ctxt = {
             'shared_secret': get_shared_secret(),
             'local_ip':
@@ -191,7 +213,7 @@ class QuantumGatewayContext(OSContextGenerator):
             'debug': config('debug'),
             'verbose': config('verbose'),
             'instance_mtu': config('instance-mtu'),
-            'l2_population': config('l2-population'),
+            'l2_population': neutron_api_settings['l2_population'],
         }
         return ctxt
 

hooks/quantum_hooks.py

@@ -162,7 +162,8 @@ def amqp_departed():
             'pgsql-db-relation-changed',
             'amqp-relation-changed',
             'cluster-relation-changed',
-            'cluster-relation-joined')
+            'cluster-relation-joined',
+            'neutron-plugin-api-relation-changed')
 @restart_on_change(restart_map())
 def db_amqp_changed():
     CONFIGS.write_all()

metadata.yaml

@@ -27,6 +27,8 @@ requires:
     interface: rabbitmq
   amqp-nova:
     interface: rabbitmq
+  neutron-plugin-api:
+    interface: neutron-plugin-api
 peers:
   cluster:
     interface: quantum-gateway-ha

unit_tests/test_quantum_contexts.py

@@ -353,3 +353,24 @@ class TestMisc(CharmTestCase):
         self.config.return_value = 'ovs'
         self.assertEquals(quantum_contexts.core_plugin(),
                           quantum_contexts.NEUTRON_ML2_PLUGIN)
+
+    def test_neutron_api_settings(self):
+        self.relation_ids.return_value = ['foo']
+        self.related_units.return_value = ['bar']
+        self.test_relation.set({'l2-population': True})
+        self.relation_get.side_effect = self.test_relation.get
+        self.assertEquals(quantum_contexts._neutron_api_settings(),
+                          {'l2_population': True})
+
+    def test_neutron_api_settings2(self):
+        self.relation_ids.return_value = ['foo']
+        self.related_units.return_value = ['bar']
+        self.test_relation.set({'l2-population': False})
+        self.relation_get.side_effect = self.test_relation.get
+        self.assertEquals(quantum_contexts._neutron_api_settings(),
+                          {'l2_population': False})
+
+    def test_neutron_api_settings_no_apiplugin(self):
+        self.relation_ids.return_value = []
+        self.assertEquals(quantum_contexts._neutron_api_settings(),
+                          {'l2_population': True})