net: ipv6 support, merge unix+ip;[pack:x] attribute (#9904)

vlib/x/websocket/websocket_server.v

@@ -15,6 +15,7 @@ mut:
 	message_callbacks       []MessageEventHandler // new message callback functions
 	close_callbacks         []CloseEventHandler   // close message callback functions
 pub:
+	family net.AddrFamily = .ip
 	port   int  // port used as listen to incoming connections
 	is_ssl bool // true if secure connection (not supported yet on server)
 pub mut:
@@ -34,9 +35,10 @@ pub mut:
 }
 
 // new_server instance a new websocket server on provided port and route
-pub fn new_server(port int, route string) &Server {
+pub fn new_server(family net.AddrFamily, port int, route string) &Server {
 	return &Server{
 		ls: 0
+		family: family
 		port: port
 		logger: &log.Log{
 			level: .info
@@ -53,7 +55,7 @@ pub fn (mut s Server) set_ping_interval(seconds int) {
 // listen start listen and process to incoming connections from websocket clients
 pub fn (mut s Server) listen() ? {
 	s.logger.info('websocket server: start listen on port $s.port')
-	s.ls = net.listen_tcp(s.port) ?
+	s.ls = net.listen_tcp(s.family, ':$s.port') ?
 	s.set_state(.open)
 	go s.handle_ping()
 	for {