/// <summary>
/// Find Ngrok tunnel info.
/// </summary>
/// <param name="ngrokApiPort">Port for Ngrok api.</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>Ngrok tunnel info.</returns>
public async Task <TunnelInfo> FindTunnel(int forwardingPort, string ngrokRegion, CancellationToken cancellationToken)
{
TunnelInfo result = null;
try
{
NgrokTunnels tunnels = null;
tunnels = await FindNgrokTunnels(this.ngrokApiPort, cancellationToken);
result = FindTunnelInfo(tunnels, forwardingPort);
if (tunnels != null && result == null)
{
if (this.ngrokProcess != null)
{
if (this.ngrokProcess.Close())
{
tunnels = null;
}
this.ngrokProcess.Dispose();
}
}
if (tunnels == null)
{
this.ngrokProcess = NgrokProcess.StartProcess(forwardingPort, ngrokRegion);
int delay = RETRY_INITIAL_DELAY;
for (int i = 0; i < RETRY_MAX; i++)
{
// delay will be 500, 1000, 2000, 4000 ms, so about 7500 ms in max.
await Task.Delay(delay, cancellationToken);
tunnels = await FindNgrokTunnels(this.ngrokApiPort, cancellationToken);
result = FindTunnelInfo(tunnels, forwardingPort);
if (result != null)
{
break;
}
delay *= 2;
}
}
}
catch (Exception ex)
{
Log.Error(ex, "Failed to find Ngrok tunneling info.");
}
cancellationToken.ThrowIfCancellationRequested();
return(result);
}
private static TunnelInfo FindTunnelInfo(NgrokTunnels ngrokTunnels, int forwardingPort)
{
TunnelInfo result = null;
if (ngrokTunnels != null && ngrokTunnels.Tunnels != null)
{
foreach (var item in ngrokTunnels.Tunnels)
{
if (item.Protocol == "https" &&
item.PublicUrl != null && item.PublicUrl.StartsWith("https://") &&
item.ForwardingInfo != null && item.ForwardingInfo.Port == forwardingPort)
{
result = item;
break;
}
}
}
return(result);
}