allow to specify drivername for postgresql db

Change-Id: Idbac640aba8f4c87ae43df3a7019bf465895ca43

manifests/db.pp

@@ -138,7 +138,7 @@ define oslo::db(
   if !is_service_default($connection) {
 
     validate_re($connection,
-      '^(sqlite|mysql(\+pymysql)?|postgresql|mongodb):\/\/(\S+:\S+@\S+\/\S+)?')
+      '^(sqlite|mysql(\+pymysql)?|postgresql(\+psycopg2)?|mongodb):\/\/(\S+:\S+@\S+\/\S+)?')
 
     if $manage_backend_package {
       case $connection {
@@ -151,7 +151,7 @@ define oslo::db(
             $backend_package = false
           }
         }
-        /^postgresql:\/\//: {
+        /^postgresql(\+psycopg2)?:\/\//: {
           $backend_package = false
           require '::postgresql::lib::python'
         }

releasenotes/notes/postgresql-590a36045748761a.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - allow to specify a full dbname+drivername://
+    protocol URL for postgresql databases.
+

spec/defines/oslo_db_spec.rb

@@ -143,6 +143,14 @@ describe 'oslo::db' do
       end
     end
 
+    context 'with postgresql backend + drivername' do
+      let :params do
+        { :connection => 'postgresql+psycopg2://db:db@localhost/db' }
+      end
+
+      it { is_expected.to contain_keystone_config('database/connection').with_value('postgresql+psycopg2://db:db@localhost/db').with_secret(true) }
+    end
+
     context 'with incorrect database_connection string' do
       let :params do
         { :connection => 'foo://db:db@localhost/db', }