Install python-redis if coordination url uses it

If tooz coordination is enabled and url is using redis
lets ensure python-redis is installed.

Change-Id: Iefe933f45353810200ec9c76ffc92f051db7a5e6

manifests/evaluator.pp

@@ -31,6 +31,12 @@ class aodh::evaluator (
     aodh_config {
       'coordination/backend_url' : value => $coordination_url;
     }
+    if ($coordination_url =~ /^redis/ ) {
+      ensure_resource('package', 'python-redis', {
+        name   => $::aodh::params::redis_package_name,
+        tag    => 'openstack',
+      })
+    }
   }
 
   ensure_resource( 'package', [$::aodh::params::evaluator_package_name],

manifests/params.pp

@@ -24,6 +24,7 @@ class aodh::params {
       $listener_service_name   = 'openstack-aodh-listener'
       $aodh_wsgi_script_path   = '/var/www/cgi-bin/aodh'
       $aodh_wsgi_script_source = '/usr/lib/python2.7/site-packages/aodh/api/app.wsgi'
+      $redis_package_name      = 'python-redis'
     }
     'Debian': {
       $common_package_name     = 'aodh-common'
@@ -43,6 +44,7 @@ class aodh::params {
       $listener_service_name   = 'aodh-listener'
       $aodh_wsgi_script_path   = '/usr/lib/cgi-bin/aodh'
       $aodh_wsgi_script_source = '/usr/share/aodh/app.wsgi'
+      $redis_package_name      = 'python-redis'
     }
     default: {
       fail("Unsupported osfamily: ${::osfamily} operatingsystem")

releasenotes/notes/install-python-redis-d695b95171f6c392.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - Install python-redis if the coordination backend url is redis. This is
+    an indirect dependency on evaluator coordination to work.

spec/classes/aodh_evaluator_spec.rb

@@ -20,6 +20,13 @@ describe 'aodh::evaluator' do
       it 'configures backend_url' do
         is_expected.to contain_aodh_config('coordination/backend_url').with_value('redis://localhost:6379')
       end
+
+      it 'installs python-redis package' do
+        is_expected.to contain_package(platform_params[:redis_package_name]).with(
+          :name => platform_params[:redis_package_name],
+	  :tag  => 'openstack'
+        )
+      end
     end
 
     context 'when enabled' do
@@ -98,10 +105,12 @@ describe 'aodh::evaluator' do
         case facts[:osfamily]
         when 'Debian'
           { :evaluator_package_name => 'aodh-evaluator',
-            :evaluator_service_name => 'aodh-evaluator' }
+            :evaluator_service_name => 'aodh-evaluator',
+            :redis_package_name     => 'python-redis' }
         when 'RedHat'
           { :evaluator_package_name => 'openstack-aodh-evaluator',
-            :evaluator_service_name => 'openstack-aodh-evaluator' }
+            :evaluator_service_name => 'openstack-aodh-evaluator',
+            :redis_package_name     => 'python-redis' }
         end
       end
       it_configures 'aodh-evaluator'