Add database slave connection configure

- According to the bool attribute
   node['openstack']['endpoints']['db']['enabled_slave'], enable/disable
   neutron database slave_connection
 - Add the slave_connection generated from db_uri function

Implements: blueprint sql-slave-connection-support

Change-Id: I19fc7fb4ab4a62fcdea77c9c4d18135fb2f49d41

recipes/default.rb

@@ -155,6 +155,9 @@ identity_uri = identity_uri_transform(identity_admin_endpoint)
 db_user = node['openstack']['db']['network']['username']
 db_pass = get_password 'db', 'neutron'
 sql_connection = db_uri('network', db_user, db_pass)
+if node['openstack']['endpoints']['db']['enabled_slave']
+  slave_connection =  db_uri('network', db_user, db_pass, true)
+end
 
 network_api_bind = endpoint 'network-api-bind'
 service_pass = get_password 'service', 'openstack-network'
@@ -233,6 +236,7 @@ template '/etc/neutron/neutron.conf' do
     identity_admin_endpoint: identity_admin_endpoint,
     service_pass: service_pass,
     sql_connection: sql_connection,
+    slave_connection: slave_connection,
     nova_endpoint: nova_endpoint,
     nova_admin_pass: nova_admin_pass,
     nova_auth_url: nova_auth_url,

spec/default_spec.rb

@@ -893,6 +893,15 @@ describe 'openstack-network' do
           expect(chef_run).to render_file(file.name).with_content(/^connection = connection_value$/)
         end
 
+        it 'sets enabled_slave attribute' do
+          node.set['openstack']['endpoints']['db']['enabled_slave'] = true
+          node.set['openstack']['db']['network']['username'] = 'db_username_value'
+          allow_any_instance_of(Chef::Recipe).to receive(:db_uri)
+            .and_return('slave_connection_value')
+          expect(chef_run).to render_file(file.name)
+            .with_content(/^slave_connection = slave_connection_value$/)
+        end
+
         %w(slave_connection max_retries retry_interval min_pool_size max_pool_size idle_timeout
            max_overflow connection_debug connection_trace pool_timeout).each do |attr|
           it "sets the #{attr} attribute" do

templates/default/neutron.conf.erb

@@ -560,7 +560,11 @@ connection = <%= @sql_connection %>
 # engine =
 
 # The SQLAlchemy connection string used to connect to the slave database
+<% if node['openstack']['endpoints']['db']['enabled_slave'] %>
+slave_connection = <%= @slave_connection %>
+<% else %>
 slave_connection = <%= node['openstack']['db']['network']['slave_connection'] %>
+<% end %>
 
 # Database reconnection retry times - in event connectivity is lost
 # set to -1 implies an infinite retry count