Add an example for recursive muxing

example_recursive_test.go

@@ -0,0 +1,90 @@
+package cmux_test
+
+import (
+	"crypto/rand"
+	"crypto/tls"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"net/rpc"
+
+	"github.com/soheilhy/cmux"
+)
+
+type recursiveHTTPHandler struct{}
+
+func (h *recursiveHTTPHandler) ServeHTTP(w http.ResponseWriter,
+	r *http.Request) {
+
+	fmt.Fprintf(w, "example http response")
+}
+
+func recursiveServeHTTP(l net.Listener) {
+	s := &http.Server{
+		Handler: &recursiveHTTPHandler{},
+	}
+	s.Serve(l)
+}
+
+func tlsListener(l net.Listener) net.Listener {
+	// Load certificates.
+	certificate, err := tls.LoadX509KeyPair("cert.pem", "key.pem")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	config := &tls.Config{
+		Certificates: []tls.Certificate{certificate},
+		Rand:         rand.Reader,
+	}
+
+	// Create TLS listener.
+	tlsl := tls.NewListener(l, config)
+	return tlsl
+}
+
+type RecursiveRPCRcvr struct{}
+
+func (r *RecursiveRPCRcvr) Cube(i int, j *int) error {
+	*j = i * i
+	return nil
+}
+
+func recursiveServeRPC(l net.Listener) {
+	s := rpc.NewServer()
+	s.Register(&RecursiveRPCRcvr{})
+	s.Accept(l)
+}
+
+// This is an example for serving HTTP, HTTPS, and GoRPC/TLS on the same port.
+func Example_recursiveCmux() {
+	// Create the TCP listener.
+	l, err := net.Listen("tcp", "127.0.0.1:50051")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Create a mux.
+	tcpm := cmux.New(l)
+
+	// We first match on HTTP 1.1 methods.
+	httpl := tcpm.Match(cmux.HTTP1Fast())
+
+	// If not matched, we assume that its TLS.
+	tlsl := tcpm.Match(cmux.Any())
+	tlsl = tlsListener(tlsl)
+
+	// Now, we build another mux recursively to match HTTPS and GoRPC.
+	// You can use the same trick for SSH.
+	tlsm := cmux.New(tlsl)
+	httpsl := tlsm.Match(cmux.HTTP1Fast())
+	gorpcl := tlsm.Match(cmux.Any())
+
+	go recursiveServeHTTP(httpl)
+	go recursiveServeHTTP(httpsl)
+	go recursiveServeRPC(gorpcl)
+
+	go tlsm.Serve()
+	tcpm.Serve()
+}

example_tls_test.go

@@ -43,7 +43,7 @@ func serveHTTPS(l net.Listener) {
 	serveHTTP1(tlsl)
 }
 
-// This is an example is serving HTTP and HTTPS on the same port.
+// This is an example for serving HTTP and HTTPS on the same port.
 func Example_bothHTTPAndHTTPS() {
 	// Create the TCP listener.
 	l, err := net.Listen("tcp", "127.0.0.1:50051")