Gorilla websocket is not closing - go

Question

I want to open websocket server whenever i want to and close but server does not close after writing "exit" when i go back to my main() and i try to start again it fails saying "httpHandleFunc multiple registration '/' " how do i close websocket server permanently and go back to main and start server again like switch on/off.
Another issue i am facing is client side errors with Bad Handshake when using gorilla mux as a handler.
#Server-Side Code
https://go.dev/play/p/n_I4xzOomWz
package main
import (
"bufio"
"flag"
"fmt"
"net/http"
"os"
"strings"
"time"
"github.com/gorilla/mux"
"github.com/gorilla/websocket"
log "github.com/sirupsen/logrus"
)
const (
// Time allowed to write a message to the peer.
writeWait = 10 * time.Second
// Maximum message size allowed from peer.
maxMessageSize = 8192
// Time allowed to read the next pong message from the peer.
pongWait = 60 * time.Second
// Send pings to peer with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
// Time to wait before force close on connection.
closeGracePeriod = 2 * time.Second
)
var (
server http.Server
addr = "0.0.0.0:443"
upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
return true
},
}
)
func ping(ws *websocket.Conn, done chan struct{}) {
ticker := time.NewTicker(pingPeriod)
defer ticker.Stop()
for {
select {
case <-ticker.C:
if err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait)); err != nil {
log.Println("ping:", err)
}
case <-done:
return
}
}
}
// write message
func pumpStdout(ws *websocket.Conn, done chan struct{}) {
defer func() {
}()
for {
text := ReadInput("User220 > ")
if text == "exit" {
break
}
ws.SetWriteDeadline(time.Now().Add(writeWait))
if err := ws.WriteMessage(websocket.TextMessage, []byte(text)); err != nil {
ws.Close()
log.Errorln(err)
break
}
}
close(done)
ws.SetWriteDeadline(time.Now().Add(writeWait))
ws.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
time.Sleep(closeGracePeriod)
ws.Close()
}
// receive message
func pumpStdin(ws *websocket.Conn, done chan struct{}) {
defer ws.Close()
ws.SetReadLimit(maxMessageSize)
ws.SetReadDeadline(time.Now().Add(pongWait))
ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(pongWait)); return nil })
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for {
select {
case <-done:
break
case <-ticker.C:
_, message, err := ws.ReadMessage()
if err != nil {
ws.CloseHandler()
err := ws.UnderlyingConn().Close()
fmt.Println(err)
main()
}
if len(message) > 0 {
fmt.Printf("\r\n%sUser220 > ", message)
}
}
}
}
func WebsocketHandle(w http.ResponseWriter, r *http.Request) {
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Fatalln(err)
}
defer c.Close()
stdoutDone := make(chan struct{})
go pumpStdout(c, stdoutDone)
go ping(c, stdoutDone)
pumpStdin(c, stdoutDone)
}
func start_socket() {
flag.Parse()
log.Printf("listen at %s", addr)
// ----------------------
mux := mux.NewRouter()
mux.HandleFunc("/", WebsocketHandle)
//-----------------------
http.HandleFunc("/", WebsocketHandle)
server = http.Server{Addr: addr}
log.Fatalln(server.ListenAndServe())
}
func stop_server() {
err := server.Close()
if err != nil {
log.Fatalln(err)
}
}
func ReadInput(promt string) string {
fmt.Printf("\n%s", promt)
reader := bufio.NewReader(os.Stdin)
input, _ := reader.ReadString('\n')
return strings.TrimSpace(input)
}
func main() {
for {
read := ReadInput("Main : ")
switch read {
case "start":
start_socket()
case "stop":
stop_server()
default:
fmt.Println("Not Sure")
}
}
}
Client side i am just polling and writing back the same message right now.
#Client-Side Code
https://go.dev/play/p/y4nUkvMFYec
package main
import (
"fmt"
"net/url"
"github.com/gorilla/websocket"
log "github.com/sirupsen/logrus"
)
var addr = "localhost:443"
func main() {
dial := websocket.Dialer{}
u := url.URL{Scheme: "ws", Host: addr, Path: "/"}
log.Printf("connecting to %s", u.String())
c, _, err := dial.Dial(u.String(), nil)
if err != nil {
log.Fatalln(err)
}
defer c.Close()
for {
_, message, err := c.ReadMessage()
if err != nil {
log.Fatalln(err)
}
fmt.Println("Recevied : " + string(message))
err = c.WriteMessage(websocket.TextMessage, message)
if err != nil {
log.Fatalln(err)
}
}
}