/// <summary>
/// Starts the local HTTP server and listen for requests
/// </summary>
/// <returns>Task completion object</returns>
/// <exception cref="InvalidOperationException">
/// If failed to find an unused port or prohibited from listening for new
/// connections.
/// </exception>
public virtual async Task RunServerAsync()
{
if (Server != null)
return;
const ushort validPortsMin = 1025;
const ushort validPortsMax = ushort.MaxValue;
var invalidPorts = new List<ushort>();
var random = new Random();
while (invalidPorts.Count < validPortsMax - validPortsMin)
{
PortNumber = (ushort) random.Next(validPortsMin, validPortsMax);
if (invalidPorts.Contains(PortNumber))
continue;
try
{
Server = new HttpListener(TimeSpan.FromSeconds(30));
await Server.StartTcpRequestListener(PortNumber);
Server.HttpRequestObservable.Subscribe(OnHttpRequest);
using (var testSocket = new TcpSocketClient())
{
var tokenSource = new CancellationTokenSource();
var connectOperation = testSocket.ConnectAsync("127.0.0.1", PortNumber.ToString(), false,
tokenSource.Token);
tokenSource.CancelAfter(TimeSpan.FromSeconds(10));
await connectOperation;
if (connectOperation.IsFaulted || connectOperation.IsCanceled)
{
if (connectOperation.Exception != null)
throw connectOperation.Exception;
throw new InvalidOperationException();
}
testSocket.Disconnect();
}
Protocol = @"http://127.0.0.1:" + PortNumber;
}
catch (NotImplementedException)
{
Server = null;
throw;
}
catch
{
invalidPorts.Add(PortNumber);
try
{
Server?.StopTcpRequestListener();
}
catch
{
// ignored
}
Server = null;
continue;
}
return;
}
throw new InvalidOperationException(@"There is no free port to bind to on this machine.");
}
public void StopListener()
{
_httpListener.StopTcpRequestListener();
}
