Add initial code

cmd/relaysrv/utils.go

@@ -0,0 +1,53 @@
+// Copyright (C) 2015 Audrius Butkevicius and Contributors (see the CONTRIBUTORS file).
+
+package main
+
+import (
+	"errors"
+	"net"
+	"time"
+)
+
+func setTCPOptions(conn net.Conn) error {
+	tcpConn, ok := conn.(*net.TCPConn)
+	if !ok {
+		return errors.New("Not a TCP connection")
+	}
+	if err := tcpConn.SetLinger(0); err != nil {
+		return err
+	}
+	if err := tcpConn.SetNoDelay(true); err != nil {
+		return err
+	}
+	if err := tcpConn.SetKeepAlivePeriod(60 * time.Second); err != nil {
+		return err
+	}
+	if err := tcpConn.SetKeepAlive(true); err != nil {
+		return err
+	}
+	return nil
+}
+
+func sendMessage(msg message, conn net.Conn) error {
+	header, err := msg.header.MarshalXDR()
+	if err != nil {
+		return err
+	}
+
+	err = conn.SetWriteDeadline(time.Now().Add(networkTimeout))
+	if err != nil {
+		return err
+	}
+
+	_, err = conn.Write(header)
+	if err != nil {
+		return err
+	}
+
+	_, err = conn.Write(msg.payload)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}