func handleViewer(conn *websocket.Conn) {
conn.SetReadDeadline(time.Now().Add(10 * time.Second))
var viewId string
if err := websocket.Message.Receive(conn, &viewId); err != nil {
return
}
slideId := index.getSlideId(viewId)
if slideId == "" {
return
}
listener := &slideListener{ch: make(chan int)}
registry.addListener(slideId, listener)
for {
slide := listener.get(1 * time.Minute)
if slide != 0 {
conn.SetDeadline(time.Now().Add(10 * time.Second))
if err := websocket.Message.Send(conn, fmt.Sprintf("%d", slide)); err != nil {
registry.removeListener(slideId, listener)
return
}
continue
}
if err := ping(conn); err != nil {
registry.removeListener(slideId, listener)
return
}
}
}
func ping(conn *websocket.Conn) error {
conn.SetDeadline(time.Now().Add(10 * time.Second))
if err := websocket.Message.Send(conn, "ping"); err != nil {
return err
}
var pong string
if err := websocket.Message.Receive(conn, &pong); err != nil {
return err
}
return nil
}
func handlePresenter(conn *websocket.Conn) {
conn.SetReadDeadline(time.Now().Add(10 * time.Second))
var slideIdParam string
if err := websocket.Message.Receive(conn, &slideIdParam); err != nil {
return
}
slideId, _ := index.getIdPair(slideIdParam)
if slideId == "" {
return
}
for {
var slide string
conn.SetDeadline(time.Now().Add(15 * time.Minute))
if err := websocket.Message.Receive(conn, &slide); err != nil {
return
}
curSlide, _ := strconv.Atoi(slide)
registry.setSlide(slideId, curSlide)
}
}