Add Tunnel: an interface for stream duplexing over a link

network/tunnel/tunnel.go

@@ -0,0 +1,31 @@
+// Package tunnel provides a network tunnel
+package tunnel
+
+import (
+	"github.com/micro/go-micro/network/link"
+	"github.com/micro/go-micro/transport"
+)
+
+// Tunnel creates a network tunnel
+type Tunnel interface {
+	// Connect connects the tunnel
+	Connect() error
+	// Close closes the tunnel
+	Close() error
+	// Dial an endpoint
+	Dial(addr string) (Conn, error)
+	// Accept connections
+	Accept(addr string) (Conn, error)
+}
+
+type Conn interface {
+	// Specifies the tunnel id
+	Id() string
+	// a transport socket
+	transport.Socket
+}
+
+// NewTunnel creates a new tunnel on top of a link
+func NewTunnel(l link.Link) Tunnel {
+	return newTunnel(l)
+}