Implement Shutdown()

This is working for TCP, but for UDP the Read does not honor the
deadline settings.

server.go

@@ -305,8 +305,13 @@ func (srv *Server) ActivateAndServe() error {
 // Shutdown shuts down a server. After a call to Shutdown, ListenAndServe and
 // ActivateAndServe will return.
 func (srv *Server) Shutdown() {
-	srv.stopTCP <- true
-	srv.stopUDP <- true
+	switch srv.Net {
+	case "tcp", "tcp4", "tcp6":
+		srv.stopTCP <- true
+	case "udp", "udp4", "udp6":
+		// TODO(miek): does not work for udp
+	//		srv.stopUDP <- true
+	}
 }
 
 // serveTCP starts a TCP listener for the server.
@@ -481,7 +486,9 @@ func (srv *Server) readTCP(conn *net.TCPConn, timeout time.Duration) ([]byte, er
 }
 
 func (srv *Server) readUDP(conn *net.UDPConn, timeout time.Duration) ([]byte, *sessionUDP, error) {
+	conn.SetReadDeadline(time.Now().Add(timeout))
 	m := make([]byte, srv.UDPSize)
+	// TODO(miek): deadline and timeout seem not to be honered
 	n, s, e := readFromSessionUDP(conn, m)
 	if e != nil || n == 0 {
 		if e != nil {

server_test.go

@@ -273,7 +273,23 @@ func TestServingLargeResponses(t *testing.T) {
 	}
 }
 
-func TestShutdown(t *testing.T) {
+func TestShutdownTCP(t *testing.T) {
+	server := Server{Addr: ":8053", Net: "tcp"}
+	go func() {
+		err := server.ListenAndServe()
+		if err != nil {
+			t.Logf("failed to setup the tcp server: %s\n", err.Error())
+			t.Fail()
+		}
+		t.Logf("successfully stopped the tcp server")
+	}()
+	time.Sleep(4e8)
+	server.Shutdown()
+	time.Sleep(1 * time.Second)
+}
+
+// TODO(miek): does not work for udp
+func TestShutdownUDP(t *testing.T) {
 	server := Server{Addr: ":8053", Net: "udp"}
 	go func() {
 		err := server.ListenAndServe()
@@ -281,8 +297,9 @@ func TestShutdown(t *testing.T) {
 			t.Logf("failed to setup the udp server: %s\n", err.Error())
 			t.Fail()
 		}
-		t.Logf("successfully stopped the server")
+		t.Logf("successfully stopped the udp server")
 	}()
 	time.Sleep(4e8)
 	server.Shutdown()
+	time.Sleep(1 * time.Second)
 }