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: I0e3503342fcf7e211cf80e4af3ba75ac8cc917d4
Closes-Bug: #1840868

manifests/init.pp

@@ -135,6 +135,16 @@
 #   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
+#
 # [*rabbit_use_ssl*]
 #   (optional) Connect over SSL for RabbitMQ
 #   Defaults to $::os_service_default
@@ -345,6 +355,7 @@ class neutron (
   $rabbit_ha_queues                     = $::os_service_default,
   $rabbit_heartbeat_timeout_threshold   = $::os_service_default,
   $rabbit_heartbeat_rate                = $::os_service_default,
+  $rabbit_heartbeat_in_pthread          = $::os_service_default,
   $rabbit_use_ssl                       = $::os_service_default,
   $rabbit_transient_queues_ttl          = $::os_service_default,
   $amqp_durable_queues                  = $::os_service_default,
@@ -477,6 +488,7 @@ class neutron (
   oslo::messaging::rabbit {'neutron_config':
     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,
     rabbit_transient_queues_ttl          => $rabbit_transient_queues_ttl,
     kombu_reconnect_delay                => $kombu_reconnect_delay,

releasenotes/notes/rabbitmq-heartbeat-over-pthread-ab7ab8985802707d.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/neutron_init_spec.rb

@@ -14,7 +14,11 @@ describe 'neutron' do
     it_behaves_like 'a neutron base installation'
 
     context 'with rabbitmq heartbeat configured' do
-      before { params.merge!( :rabbit_heartbeat_timeout_threshold => '60', :rabbit_heartbeat_rate => '10' ) }
+      before { params.merge!( 
+        :rabbit_heartbeat_timeout_threshold => '60',
+        :rabbit_heartbeat_rate => '10',
+        :rabbit_heartbeat_in_pthread => true,
+      ) }
       it_behaves_like 'rabbit with heartbeat configured'
     end
 
@@ -76,6 +80,7 @@ describe 'neutron' do
     it 'configures rabbit' do
       should contain_neutron_config('oslo_messaging_rabbit/heartbeat_timeout_threshold').with_value('<SERVICE DEFAULT>')
       should contain_neutron_config('oslo_messaging_rabbit/heartbeat_rate').with_value('<SERVICE DEFAULT>')
+      should contain_neutron_config('oslo_messaging_rabbit/heartbeat_in_pthread').with_value('<SERVICE DEFAULT>')
       should contain_neutron_config('oslo_messaging_rabbit/kombu_reconnect_delay').with_value( '<SERVICE DEFAULT>' )
       should contain_neutron_config('oslo_messaging_rabbit/kombu_missing_consumer_retry_timeout').with_value( '<SERVICE DEFAULT>' )
       should contain_neutron_config('oslo_messaging_rabbit/kombu_failover_strategy').with_value( '<SERVICE DEFAULT>' )
@@ -113,6 +118,7 @@ describe 'neutron' do
     it 'in neutron.conf' do
       should contain_neutron_config('oslo_messaging_rabbit/heartbeat_timeout_threshold').with_value('60')
       should contain_neutron_config('oslo_messaging_rabbit/heartbeat_rate').with_value('10')
+      should contain_neutron_config('oslo_messaging_rabbit/heartbeat_in_pthread').with_value(true)
     end
   end