Add Tunnel: an interface for stream duplexing over a link

network/tunnel/socket.go

@@ -0,0 +1,82 @@
+package tunnel
+
+import (
+	"errors"
+
+	"github.com/micro/go-micro/transport"
+)
+
+// socket is our pseudo socket for transport.Socket
+type socket struct {
+	// socket id based on Micro-Tunnel
+	id string
+	// closed
+	closed chan bool
+	// remote addr
+	remote string
+	// local addr
+	local string
+	// send chan
+	send chan *message
+	// recv chan
+	recv chan *message
+	// wait until we have a connection
+	wait chan bool
+}
+
+// message is sent over the send channel
+type message struct {
+	// socket id
+	id string
+	// transport data
+	data *transport.Message
+}
+
+func (s *socket) Remote() string {
+	return s.remote
+}
+
+func (s *socket) Local() string {
+	return s.local
+}
+
+func (s *socket) Id() string {
+	return s.id
+}
+
+func (s *socket) Send(m *transport.Message) error {
+	select {
+	case <-s.closed:
+		return errors.New("socket is closed")
+	default:
+		// no op
+	}
+	// append to backlog
+	s.send <- &message{id: s.id, data: m}
+	return nil
+}
+
+func (s *socket) Recv(m *transport.Message) error {
+	select {
+	case <-s.closed:
+		return errors.New("socket is closed")
+	default:
+		// no op
+	}
+	// recv from backlog
+	msg := <-s.recv
+	// set message
+	*m = *msg.data
+	// return nil
+	return nil
+}
+
+func (s *socket) Close() error {
+	select {
+	case <-s.closed:
+		// no op
+	default:
+		close(s.closed)
+	}
+	return nil
+}