Move database settings to a different class

manifests/api.pp

@@ -28,6 +28,8 @@ class ceilometer::api(
     require    => Package['ceilometer-api']
   }
 
+  Service['ceilometer-api'] -> Class['ceilometer::db']
+
   ceilometer_setting {
     'keystone_authtoken/auth_host': value => $keystone_host;
     'keystone_authtoken/auth_port': value => $keystone_port;

manifests/collector.pp

@@ -20,4 +20,5 @@ class ceilometer::collector(
     require => Package['ceilometer-collector']
   }
 
+  Service['ceilometer-collector'] -> Class['ceilometer::db']
 }

manifests/db/init.pp

@@ -0,0 +1,40 @@
+# Ceilometer::Db::Settings class
+#
+#
+class ceilometer::db::settings (
+  $database_connection = 'mysql://ceilometer:ceilometer@127.0.0.1/ceilometer'
+) {
+
+  validate_re($database_connection,
+    '(sqlite|mysql|posgres|mongodb):\/\/(\S+:\S+@\S+\/\S+)?')
+
+  case $database_connection {
+    /^mysql:\/\//: {
+      $backend_package = false
+      include mysql::python
+    }
+    /^postgres:\/\//: {
+      $backend_package = 'python-psycopg2'
+    }
+    /^mongodb:\/\//: {
+      $backend_package = 'python-pymongo'
+    }
+    /^sqlite:\/\//: {
+      $backend_package = 'python-pysqlite2'
+    }
+    default: {
+      fail('Unsupported backend configured')
+    }
+  }
+
+  if $backend_package and !defined(Package[$backend_package]) {
+    package {'ceilometer-backend-package':
+      ensure => present,
+      name   => $backend_package,
+    }
+  }
+
+  ceilometer_setting {
+    'DEFAULT/database_connection': value => $database_connection;
+  }
+}