websocket ping api about http HOT 5 CLOSED

var timer = DispatchSource.makeTimerSource()
let interval = DispatchTimeInterval.seconds(10)
timer.scheduleRepeating(deadline: .now() + interval, interval: interval, leeway: .seconds(1))
timer.setEventHandler { [weak ws, weak timer] in
    guard ws?.state == .open else {
        timer?.cancel()
        timer = nil
        return
    }
    print("ping")
    try? ws?.ping()
}
timer.resume()

// `timer` needs to be retained as long as the WebSocket lives

try background { [weak ws] in
        if ws?.state == .open {
            print("ping")
            try? ws?.ping()
            drop.console.wait(seconds: 10)
        }
    }

    try background { [weak ws] in
            while ws?.state == .open {
                print("ping")
                try? ws?.ping()
                drop.console.wait(seconds: 10)
            }
    }