private async Task DequeueCollectRequestAndSendFrame(WebSocket websocket)
{
var collectRequest = mCollectRequests.Dequeue();
await collectRequest.Task;
mScreenScale = collectRequest.Collector.Scale;
mCollectors.Enqueue(collectRequest.Collector);
var frame = new FrameInfo();
GetFrame(collectRequest.Collector, frame);
GetClipInfo(frame);
frame.Seq = collectRequest.DrawRequest.Seq; // TBD: Remove?
await ViewtopServer.WriteJson(websocket, frame);
}
async Task TryProcessOpenViewtopWebsocketsAsync(WebSocket websocket)
{
// Main loop
Task <WebSocketMessageType> receiveTask = null;
while (websocket.State < WebSocketState.CloseSent)
{
// Start read request if needed
if (receiveTask == null)
{
receiveTask = websocket.ReceiveAsync(mWebsocketRequestStream, CancellationToken.None);
}
// Await something to do (message from remote, or a completed screen capture)
var timeout = Task.Delay(REMOTE_COMMUNICATIONS_TIMEOUT_MS);
if (mCollectRequests.Count != 0)
{
await Task.WhenAny(new Task[] { timeout, mCollectRequests.Peek().Task, receiveTask });
}
else
{
await Task.WhenAny(new Task[] { timeout, receiveTask });
}
// Fail if too long without any communications from client
if (timeout.IsCompleted)
{
break;
}
// Send frames that may have completed in the background
while (mCollectRequests.Count != 0 && mCollectRequests.Peek().Task.IsCompleted)
{
await DequeueCollectRequestAndSendFrame(websocket);
}
// Process remote events
if (receiveTask.IsCompleted)
{
if (await receiveTask == WebSocketMessageType.Close)
{
break; // Closed by remote
}
receiveTask = null;
var request = ViewtopServer.ReadJson <RemoteEvents>(mWebsocketRequestStream);
if (request.Options != null)
{
mOptions = request.Options;
mLastScreenHash = 0; // Ask CopyScreen blocking to end early
}
ProcessRemoteEvents(request.Events);
if (request.DrawRequest != null)
{
await EnqueueCollectRequestAsync(websocket, request);
}
}
}
}
