Adds a simple golang udp server
This will add a simple udp server to the http server which recieves packets and counts them. It will also send back a udp message with the id. Change-Id: Ia65df76747fd6b9fc74d9799a86ee9c30e297fbe
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@ -4,6 +4,7 @@ import (
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"flag"
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"fmt"
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"io"
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"net"
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"net/http"
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"sync"
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"time"
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@ -17,6 +18,7 @@ type ConnectionCount struct {
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cur_conn int
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max_conn int
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total_conn int
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packets int
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}
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var scoreboard ConnectionCount
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@ -39,11 +41,18 @@ func (cc *ConnectionCount) close() {
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cc.cur_conn--
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}
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func (cc *ConnectionCount) stats() (int, int) {
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func (cc *ConnectionCount) stats() (int, int, int) {
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cc.mu.Lock()
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defer cc.mu.Unlock()
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return cc.max_conn, cc.total_conn
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return cc.max_conn, cc.total_conn, cc.packets
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}
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func (cc *ConnectionCount) inc() {
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cc.mu.Lock()
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defer cc.mu.Unlock()
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cc.packets++
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}
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func (cc *ConnectionCount) reset() {
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@ -52,6 +61,7 @@ func (cc *ConnectionCount) reset() {
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cc.max_conn = 0
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cc.total_conn = 0
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cc.packets = 0
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}
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func root_handler(w http.ResponseWriter, r *http.Request) {
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@ -78,8 +88,8 @@ func slow_handler(w http.ResponseWriter, r *http.Request) {
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func stats_handler(w http.ResponseWriter, r *http.Request) {
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http.SetCookie(w, &sess_cookie)
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max_conn, total_conn := scoreboard.stats()
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fmt.Fprintf(w, "max_conn=%d\ntotal_conn=%d\n", max_conn, total_conn)
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max_conn, total_conn, packets := scoreboard.stats()
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fmt.Fprintf(w, "max_conn=%d\ntotal_conn=%d\npackets=%d\n", max_conn, total_conn, packets)
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}
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func reset_handler(w http.ResponseWriter, r *http.Request) {
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@ -88,9 +98,22 @@ func reset_handler(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "reset\n")
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}
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func udp_handler(port *int) {
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ServerConn, _ := net.ListenUDP("udp", &net.UDPAddr{IP: []byte{0, 0, 0, 0}, Port: *port, Zone: ""})
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defer ServerConn.Close()
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buf := make([]byte, 1024)
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for {
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n, addr, _ := ServerConn.ReadFromUDP(buf)
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scoreboard.inc()
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fmt.Println("Received ", string(buf[0:n]), " from ", addr)
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ServerConn.WriteTo([]byte(resp), addr)
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}
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}
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func main() {
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portPtr := flag.Int("port", 8080, "TCP port to listen on")
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idPtr := flag.String("id", "1", "Server ID")
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udpPortPtr := flag.Int("udpPort", -1, "UDP port to listen on. If port <=0 UDP server won't start")
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flag.Parse()
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@ -103,5 +126,9 @@ func main() {
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http.HandleFunc("/stats", stats_handler)
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http.HandleFunc("/reset", reset_handler)
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portStr := fmt.Sprintf(":%d", *portPtr)
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if *udpPortPtr > 0 {
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// only start server if flag is set
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go udp_handler(udpPortPtr)
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}
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http.ListenAndServe(portStr, nil)
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}
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