private async Task <Responses.IVPNResponse> SendRecvAsync(Requests.Request request, TimeSpan timeout)
{
// initialize waiter
Responses.IVPNResponse response = null;
var evt = new ManualResetEvent(false);
Action <Responses.IVPNResponse> waiter = new Action <Responses.IVPNResponse>((resp) =>
{
if (resp.Idx == request.Idx)
{
if (response != null)
{
return;
}
response = resp;
evt.Set();
}
});
try
{
// register waiter
lock (__ResponseWaiters)
{
__RequestCounter += 1;
if (__RequestCounter == 0)
{
__RequestCounter = 1;
}
request.Idx = __RequestCounter;
__ResponseWaiters.Add(waiter);
}
// send request
SendRequest(request);
// wait for response
await Task.Run(() =>
{
if (WaitHandle.WaitTimeout == WaitHandle.WaitAny(new WaitHandle[] { evt, __CancellationToken.Token.WaitHandle }, timeout))
{
throw new TimeoutException("Response timeout");
}
});
}
finally
{
// un-register waiter
lock (__ResponseWaiters)
{
__ResponseWaiters.Remove(waiter);
}
}
return(response);
}
private void SendRequest(Requests.Request request)
{
Logging.Info("Sending: " + request);
lock (__StreamWriter)
{
__StreamWriter.WriteLine(JsonConvert.SerializeObject(request));
__StreamWriter.Flush();
}
}
private async Task <TResult> SendRecvRequestAsync <TResult>(Requests.Request request) where TResult : Responses.IVPNResponse
{
var response = await SendRecvAsync(request, TimeSpan.FromMilliseconds(SYNC_RESPONSE_TIMEOUT_MS));
if (response is Responses.IVPNErrorResponse errorResponse)
{
throw new IVPNClientProxyException(errorResponse.ErrorMessage);
}
TResult ret = null;
try
{
ret = (TResult)response;
}
catch (Exception ex)
{
Logging.Info($"Error casting - expected:{typeof(TResult).FullName}, received:{response.GetType()}:" + ex);
}
return(ret);
}