Introduce the new rabbit_heartbeat_in_pthread option

oslo.messaging RabbitMQ driver have now a new option that allow user to
run the RabbitMQ heartbeat over a native python thread.

These change allow user to use this new option.

Change-Id: I8d8d9870c5c20f0d256c2000d893ea25c118b651
Closes-Bug: #1840868

manifests/init.pp

@@ -47,6 +47,16 @@
 #   every 30 seconds.
 #   Defaults to $::os_service_default
 #
+# [*rabbit_heartbeat_in_pthread*]
+#   (Optional) EXPERIMENTAL: Run the health check heartbeat thread
+#   through a native python thread. By default if this
+#   option isn't provided the  health check heartbeat will
+#   inherit the execution model from the parent process. By
+#   example if the parent process have monkey patched the
+#   stdlib by using eventlet/greenlet then the heartbeat
+#   will be run through a green thread.
+#   Defaults to $::os_service_default
+#
 # [*kombu_ssl_ca_certs*]
 #   (optional) SSL certification authority file (valid only if SSL enabled).
 #   Defaults to $::os_service_default
@@ -220,6 +230,7 @@ class octavia (
   $rabbit_use_ssl                     = $::os_service_default,
   $rabbit_heartbeat_timeout_threshold = $::os_service_default,
   $rabbit_heartbeat_rate              = $::os_service_default,
+  $rabbit_heartbeat_in_pthread        = $::os_service_default,
   $rabbit_ha_queues                   = $::os_service_default,
   $kombu_ssl_ca_certs                 = $::os_service_default,
   $kombu_ssl_certfile                 = $::os_service_default,
@@ -278,6 +289,7 @@ class octavia (
     rabbit_ha_queues            => $rabbit_ha_queues,
     heartbeat_timeout_threshold => $rabbit_heartbeat_timeout_threshold,
     heartbeat_rate              => $rabbit_heartbeat_rate,
+    heartbeat_in_pthread        => $rabbit_heartbeat_in_pthread,
     rabbit_use_ssl              => $rabbit_use_ssl,
     kombu_reconnect_delay       => $kombu_reconnect_delay,
     kombu_failover_strategy     => $kombu_failover_strategy,

releasenotes/notes/rabbitmq-heartbeat-over-pthread-9ade0b50b7da0598.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Allow users to run the RabbitMQ heartbeat over a native python thread in the
+    oslo.messaging RabbitMQ driver, by using the `rabbit_heartbeat_in_pthread`
+    option in configuration.

spec/classes/octavia_init_spec.rb

@@ -33,6 +33,7 @@ describe 'octavia' do
         is_expected.to contain_octavia_config('DEFAULT/control_exchange').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_octavia_config('oslo_messaging_rabbit/heartbeat_timeout_threshold').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_octavia_config('oslo_messaging_rabbit/heartbeat_rate').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_octavia_config('oslo_messaging_rabbit/heartbeat_in_pthread').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_octavia_config('oslo_messaging_rabbit/kombu_compression').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_octavia_config('oslo_messaging_rabbit/kombu_failover_strategy').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_octavia_config('oslo_messaging_notifications/transport_url').with_value('<SERVICE DEFAULT>')
@@ -53,6 +54,7 @@ describe 'octavia' do
           :rabbit_ha_queues                   => 'undef',
           :rabbit_heartbeat_timeout_threshold => '60',
           :rabbit_heartbeat_rate              => '10',
+          :rabbit_heartbeat_in_pthread        => true,
           :kombu_compression                  => 'gzip',
           :kombu_failover_strategy            => 'shuffle',
           :package_ensure                     => '2012.1.1-15.el6',
@@ -69,6 +71,7 @@ describe 'octavia' do
         is_expected.to contain_octavia_config('DEFAULT/control_exchange').with_value('octavia')
         is_expected.to contain_octavia_config('oslo_messaging_rabbit/heartbeat_timeout_threshold').with_value('60')
         is_expected.to contain_octavia_config('oslo_messaging_rabbit/heartbeat_rate').with_value('10')
+        is_expected.to contain_octavia_config('oslo_messaging_rabbit/heartbeat_in_pthread').with_value(true)
         is_expected.to contain_octavia_config('oslo_messaging_rabbit/kombu_compression').with_value('gzip')
         is_expected.to contain_octavia_config('oslo_messaging_rabbit/kombu_failover_strategy').with_value('shuffle')
       end