I cannot escape a for loop with a ticker - go

Question

I have this API that scans for drivers' locations and send them via web-socket every 1 second. The issue is that the loop cannot be escaped when client disconnects. It seems it is alive for ever. I am using Gin with nhooyr websocket library.
var GetDriverLocations = func(c *gin.Context) {
wsoptions := websocket.AcceptOptions{InsecureSkipVerify: true}
wsconn, err := websocket.Accept(c.Writer, c.Request, &wsoptions)
if err != nil {
return
}
defer wsconn.Close(websocket.StatusInternalError, "the sky is falling")
driverLocation := &models.DriverLocation{}
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
case <-c.Request.Context().Done():
fmt.Println("done") //this never gets printed
return
}
coords, err := driverLocation.GetDrivers()
if err != nil {
break
}
err = wsjson.Write(c.Request.Context(), wsconn, &coords)
if websocket.CloseStatus(err) == websocket.StatusNormalClosure {
break
}
if err != nil {
break
}
}
fmt.Println("conn ended") //this never gets printed
}
I also tried this loop but also has the same issue:
for range ticker.C{
coords, err := driverLocation.GetDrivers()
if err != nil {
break
}
err = wsjson.Write(c.Request.Context(), wsconn, &coords)
if websocket.CloseStatus(err) == websocket.StatusNormalClosure {
break
}
if err != nil {
break
}
}

Answer 1

Because the network connection is hijacked from the net/http server by the nhooyr websocket library, the context c.Request.Context() is not canceled until handler returns.
Call CloseRead to get a context that's canceled when the connection is closed. Use that context in the loop.
var GetDriverLocations = func(c *gin.Context) {
wsoptions := websocket.AcceptOptions{InsecureSkipVerify: true}
wsconn, err := websocket.Accept(c.Writer, c.Request, &wsoptions)
if err != nil {
return
}
defer wsconn.Close(websocket.StatusInternalError, "")
ctx := wsconn.CloseRead(c.Request.Context())
driverLocation := &models.DriverLocation{}
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
case <-ctx.Done():
return
}
coords, err := driverLocation.GetDrivers()
if err != nil {
break
}
err = wsjson.Write(c.Request.Context(), wsconn, &coords)
if err != nil {
break
}
}
}