// routine to poll user information for a given room at variable intervals
func pollTfsRoomUsers(room *tfs.Room, tfsApi *tfs.Api, min time.Duration, max time.Duration, send *chan interface{}, recv *chan interface{}) {
delay := min
userMap := make(map[string]*tfs.RoomUser)
timer := time.NewTimer(delay)
defer timer.Stop()
for {
select {
case <-timer.C:
delay = delay * 2
if delay > max {
delay = max
}
users, err := tfsApi.GetRoomUsers(room)
if err != nil {
trace.Log(err)
*send <- fmt.Sprintf("users error %d %s", room.Id, err)
return
}
// added
newUserMap := make(map[string]*tfs.RoomUser)
for _, user := range users.Value {
newUserMap[user.User.Id] = user
if _, ok := userMap[user.User.Id]; ok {
continue
}
json, err := json.Marshal(user)
if err != nil {
trace.Log(err)
continue
}
*send <- fmt.Sprintf("users add %d %s %s", user.RoomId, user.User.Id, json)
userMap[user.User.Id] = user
delay = min
}
// removed
for _, user := range userMap {
if _, ok := newUserMap[user.User.Id]; ok {
continue
}
*send <- fmt.Sprintf("users remove %d %s", user.RoomId, user.User.Id)
delete(userMap, user.User.Id)
delay = min
}
// changed
for id, user := range newUserMap {
if newUserMap[id].IsOnline != userMap[id].IsOnline {
json, err := json.Marshal(*user)
if err != nil {
trace.Log(err)
continue
}
userMap[id] = newUserMap[id]
*send <- fmt.Sprintf("users change %d %s %s", user.RoomId, user.User.Id, json)
delay = min
}
}
timer.Reset(delay)
case <-*recv: // quit
return
}
}
}
