/// <summary>
/// Receives data on <see cref="T:WebAssembly.Net.WebSockets.ClientWebSocket"/> as an asynchronous operation.
/// </summary>
/// <returns>The async.</returns>
/// <param name="buffer">Buffer.</param>
/// <param name="cancellationToken">Cancellation token.</param>
public async Task <WebRtcReceiveResult> ReceiveAsync(ArraySegment <byte> buffer, CancellationToken cancellationToken)
{
ThrowIfDisposed();
var tcsReceive = new TaskCompletionSource <WebRtcReceiveResult>();
// Wrap the cancellationToken in a using so that it can be disposed of whether
// we successfully receive or not.
// Otherwise any timeout/cancellation would apply to the full session.
using (cancellationToken.Register(() => tcsReceive.TrySetCanceled()))
{
if (bufferedPayload == null)
{
bufferedPayload = await receiveMessageQueue.DequeuePayloadAsync(cancellationToken);
}
var endOfMessage = bufferedPayload.BufferPayload(buffer, out WebRtcReceiveResult receiveResult);
tcsReceive.SetResult(receiveResult);
if (endOfMessage)
{
bufferedPayload = null;
}
return(await tcsReceive.Task);
}
}
public RTCDataChannel(JSObject ho)
{
cts = new CancellationTokenSource();
this.hostObject = ho;
_ = Task.Run(Receive);
onMessage = new Action <JSObject>((messageEvent) =>
{
ThrowIfNotConnected();
using (messageEvent)
{
// get the events "data"
var eventData = messageEvent.GetObjectProperty("data");
switch (eventData)
{
case ArrayBuffer buffer: using (buffer)
{
var mess = new ReceivePayload(buffer, WebSockets.WebSocketMessageType.Binary);
receiveMessageQueue.BufferPayload(mess);
}
break;
case JSObject blobData: using (blobData)
{
// TODO: Handle ArrayBuffer binary type but have only seen 'blob' so far without
// changing the default websocket binary type manually.
var dataType = hostObject.GetObjectProperty("binaryType").ToString();
if (dataType == "blob")
{
Action <JSObject> loadend = null;
// Create a new "FileReader" object
using (var reader = new HostObject("FileReader"))
{
loadend = new Action <JSObject>((loadEvent) =>
{
using (var target = (JSObject)loadEvent.GetObjectProperty("target"))
{
if ((int)target.GetObjectProperty("readyState") == 2)
{
using (var binResult = (ArrayBuffer)target.GetObjectProperty("result"))
{
var mess = new ReceivePayload(binResult, WebSockets.WebSocketMessageType.Binary);
receiveMessageQueue.BufferPayload(mess);
//Runtime.FreeObject(loadend);
}
}
}
loadEvent.Dispose();
});
reader.Invoke("addEventListener", "loadend", loadend);
//using (var blobData = (JSObject)messageEvent.GetObjectProperty("data"))
// reader.Invoke("readAsArrayBuffer", blobData);
}
}
else
{
throw new NotImplementedException($"WebSocket binary type '{hostObject.GetObjectProperty("binaryType").ToString()}' not supported.");
}
}
break;
case String message:
{
var mess = new ReceivePayload(Encoding.UTF8.GetBytes(message), WebSockets.WebSocketMessageType.Text);
receiveMessageQueue.BufferPayload(mess);
}
break;
}
}
});
// Attach the onMessage callaback
hostObject.Invoke("addEventListener", "message", onMessage);
onOpen = new Action <JSObject>((messageEvent) =>
{
this.OnOpen?.Invoke(this, EventArgs.Empty);
messageEvent.Dispose();
});
// Attach the onMessage callaback
hostObject.SetObjectProperty("onopen", onOpen);
onClose = new Action <JSObject>((messageEvent) =>
{
this.OnClose?.Invoke(this, EventArgs.Empty);
messageEvent.Dispose();
});
// Attach the onMessage callaback
hostObject.SetObjectProperty("onclose", onClose);
}