Add neutron-control interface

Add neutron-control interface to allow charms to send triggers to
restart neutron services managed by this charm

Change-Id: I0e44f7cab99db4fb9b5d2764859e16b30705e6fe

.gitignore

@@ -5,3 +5,4 @@ bin
 tags
 *.sw[nop]
 *.pyc
+.unit-state.db

hooks/neutron-control-relation-broken

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

hooks/neutron-control-relation-changed

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

hooks/neutron-control-relation-departed

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

hooks/neutron-control-relation-joined

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

hooks/neutron_ovs_context.py

@@ -268,16 +268,29 @@ class SharedSecretContext(OSContextGenerator):
 
 class RemoteRestartContext(OSContextGenerator):
 
+    def __init__(self, interfaces=None):
+        self.interfaces = interfaces or ['neutron-plugin']
+
     def __call__(self):
-        for rid in relation_ids('neutron-plugin'):
+        rids = []
+        for interface in self.interfaces:
+            rids.extend(relation_ids(interface))
+        ctxt = {}
+        for rid in rids:
             for unit in related_units(rid):
-                restart_uuid = relation_get(
-                    attribute='restart-trigger',
+                remote_data = relation_get(
                     rid=rid,
                     unit=unit)
-                if restart_uuid:
-                    return {'restart_trigger': restart_uuid}
-        return {}
+                for k, v in remote_data.items():
+                    if k.startswith('restart-trigger'):
+                        restart_key = k.replace('-', '_')
+                        try:
+                            ctxt[restart_key].append(v)
+                        except KeyError:
+                            ctxt[restart_key] = [v]
+        for restart_key in ctxt.keys():
+            ctxt[restart_key] = '-'.join(sorted(ctxt[restart_key]))
+        return ctxt
 
 
 class APIIdentityServiceContext(context.IdentityServiceContext):

hooks/neutron_ovs_hooks.py

@@ -143,6 +143,12 @@ def zeromq_configuration_relation_changed():
     CONFIGS.write_all()
 
 
+@hooks.hook('neutron-control-relation-changed')
+@restart_on_change(restart_map(), stopstart=True)
+def restart_check():
+    CONFIGS.write_all()
+
+
 def main():
     try:
         hooks.execute(sys.argv)

hooks/neutron_ovs_utils.py

@@ -136,7 +136,8 @@ BASE_RESOURCE_MAP = OrderedDict([
     (NEUTRON_CONF, {
         'services': ['neutron-plugin-openvswitch-agent'],
         'contexts': [neutron_ovs_context.OVSPluginContext(),
-                     neutron_ovs_context.RemoteRestartContext(),
+                     neutron_ovs_context.RemoteRestartContext(
+                         ['neutron-plugin', 'neutron-control']),
                      context.AMQPContext(ssl_dir=NEUTRON_CONF_DIR),
                      context.ZeroMQContext(),
                      context.NotificationDriverContext()],

metadata.yaml

@@ -22,6 +22,8 @@ provides:
   neutron-plugin:
     interface: neutron-plugin
     scope: container
+  neutron-control:
+    interface: service-control
 requires:
   amqp:
     interface: rabbitmq
@@ -30,4 +32,3 @@ requires:
   zeromq-configuration:
     interface: zeromq-configuration
     scope: container
-

templates/icehouse/dhcp_agent.ini

@@ -1,7 +1,9 @@
 ###############################################################################
 # [ WARNING ]
 # Configuration file maintained by Juju. Local changes may be overwritten.
+# {{ restart_trigger_dhcp }}
 ###############################################################################
+
 [DEFAULT]
 state_path = /var/lib/neutron
 interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver

templates/icehouse/metadata_agent.ini

@@ -4,6 +4,7 @@
 ###############################################################################
 # Metadata service seems to cache neutron api url from keystone so trigger
 # restart if it changes: {{ quantum_url }}
+# {{ restart_trigger_metadata }}
 
 [DEFAULT]
 auth_url = {{ service_protocol }}://{{ service_host }}:{{ service_port }}/v2.0

templates/juno/l3_agent.ini

@@ -1,7 +1,9 @@
 ###############################################################################
 # [ WARNING ]
 # Configuration file maintained by Juju. Local changes may be overwritten.
+# {{ restart_trigger_l3agent }}
 ###############################################################################
+
 [DEFAULT]
 interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
 agent_mode = {{ agent_mode }}

templates/juno/metadata_agent.ini

@@ -4,6 +4,7 @@
 ###############################################################################
 # Metadata service seems to cache neutron api url from keystone so trigger
 # restart if it changes: {{ quantum_url }}
+# {{ restart_trigger_metadata }}
 
 [DEFAULT]
 auth_url = {{ service_protocol }}://{{ service_host }}:{{ service_port }}/v2.0

templates/kilo/neutron.conf

@@ -1,9 +1,10 @@
-# icehouse
+# kilo
 ###############################################################################
 # [ WARNING ]
 # Configuration file maintained by Juju. Local changes may be overwritten.
 # Config managed by neutron-openvswitch charm
-# Service restart triggered by principle using key: {{ restart_trigger }}
+# Service restart triggered by remote application: {{ restart_trigger }}
+#                                                  {{ restart_trigger_neutron }}
 ###############################################################################
 [DEFAULT]
 verbose = {{ verbose }}

unit_tests/test_neutron_ovs_context.py

@@ -491,14 +491,54 @@ class TestRemoteRestartContext(CharmTestCase):
     def test_restart_trigger_present(self):
         self.relation_ids.return_value = ['rid1']
         self.related_units.return_value = ['nova-compute/0']
-        self.relation_get.return_value = '8f73-f3adb96a90d8'
+        self.relation_get.return_value = {
+            'restart-trigger': '8f73-f3adb96a90d8',
+        }
         self.assertEquals(
             context.RemoteRestartContext()(),
             {'restart_trigger': '8f73-f3adb96a90d8'}
         )
+        self.relation_ids.assert_called_with('neutron-plugin')
+
+    def test_restart_trigger_present_alt_relation(self):
+        self.relation_ids.return_value = ['rid1']
+        self.related_units.return_value = ['nova-compute/0']
+        self.relation_get.return_value = {
+            'restart-trigger': '8f73-f3adb96a90d8',
+        }
+        self.assertEquals(
+            context.RemoteRestartContext(['neutron-control'])(),
+            {'restart_trigger': '8f73-f3adb96a90d8'}
+        )
+        self.relation_ids.assert_called_with('neutron-control')
+
+    def test_restart_trigger_present_multi_relation(self):
+        self.relation_ids.return_value = ['rid1']
+        self.related_units.return_value = ['nova-compute/0']
+        ids = [
+            {'restart-trigger': '8f73'},
+            {'restart-trigger': '2ac3'}]
+        self.relation_get.side_effect = lambda rid, unit: ids.pop()
+        self.assertEquals(
+            context.RemoteRestartContext(
+                ['neutron-plugin', 'neutron-control'])(),
+            {'restart_trigger': '2ac3-8f73'}
+        )
+        self.relation_ids.assert_called_with('neutron-control')
 
     def test_restart_trigger_absent(self):
         self.relation_ids.return_value = ['rid1']
         self.related_units.return_value = ['nova-compute/0']
-        self.relation_get.return_value = None
+        self.relation_get.return_value = {}
         self.assertEquals(context.RemoteRestartContext()(), {})
+
+    def test_restart_trigger_service(self):
+        self.relation_ids.return_value = ['rid1']
+        self.related_units.return_value = ['nova-compute/0']
+        self.relation_get.return_value = {
+            'restart-trigger-neutron': 'neutron-uuid',
+        }
+        self.assertEquals(
+            context.RemoteRestartContext()(),
+            {'restart_trigger_neutron': 'neutron-uuid'}
+        )