135 lines
2.7 KiB
Go
135 lines
2.7 KiB
Go
package main
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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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)
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var sess_cookie http.Cookie
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var resp string
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type ConnectionCount struct {
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mu sync.Mutex
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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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func (cc *ConnectionCount) open() {
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cc.mu.Lock()
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defer cc.mu.Unlock()
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cc.cur_conn++
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cc.total_conn++
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}
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func (cc *ConnectionCount) close() {
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cc.mu.Lock()
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defer cc.mu.Unlock()
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if cc.cur_conn > cc.max_conn {
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cc.max_conn = cc.cur_conn
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}
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cc.cur_conn--
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}
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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, 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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cc.mu.Lock()
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defer cc.mu.Unlock()
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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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scoreboard.open()
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defer scoreboard.close()
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http.SetCookie(w, &sess_cookie)
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io.WriteString(w, resp)
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}
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func slow_handler(w http.ResponseWriter, r *http.Request) {
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scoreboard.open()
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defer scoreboard.close()
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delay, err := time.ParseDuration(r.URL.Query().Get("delay"))
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if err != nil {
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delay = 3 * time.Second
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}
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time.Sleep(delay)
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http.SetCookie(w, &sess_cookie)
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io.WriteString(w, resp)
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}
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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, 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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http.SetCookie(w, &sess_cookie)
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scoreboard.reset()
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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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resp = fmt.Sprintf("%s", *idPtr)
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sess_cookie.Name = "JSESSIONID"
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sess_cookie.Value = *idPtr
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http.HandleFunc("/", root_handler)
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http.HandleFunc("/slow", slow_handler)
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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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