private Task <IEnumerable <NatDevice> > DiscoverAsync(PortMapper portMapper, bool onlyOne, CancellationTokenSource cts)
{
TraceSource.LogInfo("Start Discovery");
var searcherTasks = new List <Task <IEnumerable <NatDevice> > >();
if (portMapper.HasFlag(PortMapper.Upnp))
{
var upnpSearcher = new UpnpSearcher(new IPAddressesProvider());
upnpSearcher.DeviceFound += (sender, args) => { if (onlyOne)
{
cts.Cancel();
}
};
searcherTasks.Add(upnpSearcher.Search(cts.Token));
}
if (portMapper.HasFlag(PortMapper.Pmp))
{
var pmpSearcher = new PmpSearcher(new IPAddressesProvider());
pmpSearcher.DeviceFound += (sender, args) => { if (onlyOne)
{
cts.Cancel();
}
};
searcherTasks.Add(pmpSearcher.Search(cts.Token));
}
return(TaskExtension.WhenAll(searcherTasks.ToArray())
.ContinueWith(t =>
{
TraceSource.LogInfo("Stop Discovery");
var devices = searcherTasks.SelectMany(x => x.Result);
foreach (var device in devices)
{
var key = device.ToString();
NatDevice nat;
if (Devices.TryGetValue(key, out nat))
{
nat.Touch();
}
else
{
Devices.Add(key, device);
}
}
return devices;
}));
}
public static Task <TResult> TimeoutAfter <TResult>(this Task <TResult> task, TimeSpan timeout)
{
#if DEBUG
return(task);
#endif
var timeoutCancellationTokenSource = new CancellationTokenSource();
return(TaskExtension.WhenAny(task, TaskExtension.Delay(timeout, timeoutCancellationTokenSource.Token))
.ContinueWith(t =>
{
Task completedTask = t.Result;
if (completedTask == task)
{
timeoutCancellationTokenSource.Cancel();
return task;
}
throw new TimeoutException(
"The operation has timed out. The network is broken, router has gone or is too busy.");
}).Unwrap());
}