Make the messaging driver configurable

Instead of defaulting to kombu+memory messaging driver, make the
option configurable for the end user.

Changing the config option rpc_backend will change to the
corresponding messaging driver.
Eg: rpc_backend=kombu+memory or rpc_backend=rabbit etc

Change-Id: If1bd27b6cf7d0f732e01bf3a9614f94e49b523cb

congress/common/eventlet_server.py

@@ -36,7 +36,6 @@ from paste import deploy
 
 from congress.dse2 import dse_node
 from congress import exception
-from congress.tests import helper
 
 LOG = logging.getLogger(__name__)
 
@@ -88,13 +87,10 @@ class APIServer(service.ServiceBase):
         self.node = None
 
         if cfg.CONF.distributed_architecture:
-            messaging_config = helper.generate_messaging_config()
-            messaging_config.rpc_response_timeout = 10
-
             # TODO(masa): To support Active-Active HA with DseNode on any
             # driver of oslo.messaging, make sure to use same partition_id
             # among multi DseNodes sharing same message topic namespace.
-            self.node = dse_node.DseNode(messaging_config, self.name, [],
+            self.node = dse_node.DseNode(cfg.CONF, self.name, [],
                                          partition_id=self.name)
 
     def start(self, key=None, backlog=128):

congress/harness.py

@@ -44,7 +44,6 @@ from congress.dse2 import dse_node
 from congress import exception
 from congress.managers import datasource as datasource_manager
 from congress.policy_engines.agnostic import Dse2Runtime
-from congress.tests import helper
 from congress import utils
 
 
@@ -280,10 +279,8 @@ def create2(node=None):
     if node:
         bus = node
     else:
-        messaging_config = helper.generate_messaging_config()
         bus_name = "root"
-        bus = dse_node.DseNode(messaging_config, bus_name, [],
-                               partition_id=bus_name)
+        bus = dse_node.DseNode(cfg.CONF, bus_name, [], partition_id=bus_name)
 
     # create services
     services = {}

devstack/plugin.sh

@@ -64,6 +64,10 @@ function configure_congress {
         # 1. multi dse_nodes run on one devstack node
         # 2. each dse_nodes run on different devstack node
         iniset $CONGRESS_CONF dse node_id 'devstack-node'
+
+        # Set RabbitMQ credentials
+        iniset $CONGRESS_CONF oslo_messaging_rabbit rabbit_userid $RABBIT_USERID
+        iniset $CONGRESS_CONF oslo_messaging_rabbit rabbit_password $RABBIT_PASSWORD
     fi
 
     CONGRESS_DRIVERS="congress.datasources.neutronv2_driver.NeutronV2Driver,"

etc/congress-config-generator.conf

@@ -6,4 +6,5 @@ namespace = oslo.log
 namespace = oslo.policy
 namespace = oslo.db
 namespace = oslo.middleware.cors
+namespace = oslo.messaging
 namespace = keystonemiddleware.auth_token