def allocate_fixed_ip(self, context, tenant_id, quantum_net_id, vif_rec): """Allocates a single fixed IPv4 address for a virtual interface.""" admin_context = context.elevated() network = db.network_get_by_uuid(admin_context, quantum_net_id) address = None if network['cidr']: address = db.fixed_ip_associate_pool(admin_context, network['id'], vif_rec['instance_id']) values = {'allocated': True, 'virtual_interface_id': vif_rec['id']} db.fixed_ip_update(admin_context, address, values) return address