private async Task ConnectAsyncJavaScript(Uri uri, CancellationToken cancellationToken)
{
var tcsConnect = new TaskCompletionSource <bool> ();
// For Abort/Dispose. Calling Abort on the request at any point will close the connection.
cts.Token.Register(AbortRequest);
// Wrap the cancellationToken in a using so that it can be disposed of whether
// we successfully connected or failed trying.
// Otherwise any timeout/cancellation would apply to the full session.
// In the failure case we need to release the references and dispose of the objects.
using (cancellationToken.Register(() => tcsConnect.TrySetCanceled())) {
try {
Core.Array subProtocols = null;
if (Options.RequestedSubProtocols.Count > 0)
{
subProtocols = new Core.Array();
foreach (var item in Options.RequestedSubProtocols)
{
subProtocols.Push(item);
}
}
innerWebSocket = new HostObject("WebSocket", uri.ToString(), subProtocols);
subProtocols?.Dispose();
// Setup the onError callback
onError = new Action <JSObject> ((errorEvt) => {
errorEvt.Dispose();
});
// Attach the onError callback
innerWebSocket.SetObjectProperty("onerror", onError);
// Setup the onClose callback
onClose = new Action <JSObject> ((closeEvt) => {
innerWebSocketCloseStatus = (WebSocketCloseStatus)closeEvt.GetObjectProperty("code");
innerWebSocketCloseStatusDescription = closeEvt.GetObjectProperty("reason")?.ToString();
var mess = new ReceivePayload(WebSocketHelpers.EmptyPayload, WebSocketMessageType.Close);
receiveMessageQueue.BufferPayload(mess);
if (!tcsConnect.Task.IsCanceled && !tcsConnect.Task.IsCompleted && !tcsConnect.Task.IsFaulted)
{
tcsConnect.SetException(new WebSocketException(WebSocketError.NativeError));
}
else
{
tcsClose?.SetResult(true);
}
closeEvt.Dispose();
});
// Attach the onClose callback
innerWebSocket.SetObjectProperty("onclose", onClose);
// Setup the onOpen callback
onOpen = new Action <JSObject> ((evt) => {
if (!cancellationToken.IsCancellationRequested)
{
// Change internal state to 'connected' to enable the other methods
if (Interlocked.CompareExchange(ref state, connected, connecting) != connecting)
{
// Aborted/Disposed during connect.
throw new ObjectDisposedException(GetType().FullName);
}
tcsConnect.SetResult(true);
}
evt.Dispose();
});
// Attach the onOpen callback
innerWebSocket.SetObjectProperty("onopen", onOpen);
// Setup the onMessage callback
onMessage = new Action <JSObject> ((messageEvent) => {
ThrowIfNotConnected();
// get the events "data"
var eventData = messageEvent.GetObjectProperty("data");
// If the messageEvent's data property is marshalled as a JSObject then we are dealing with
// binary data
if (eventData is JSObject)
{
// TODO: Handle ArrayBuffer binary type but have only seen 'blob' so far without
// changing the default websocket binary type manually.
if (innerWebSocket.GetObjectProperty("binaryType").ToString() == "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, 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 bynary type '{innerWebSocket.GetObjectProperty ("binaryType").ToString ()}' not supported.");
}
}
else if (eventData is string)
{
var mess = new ReceivePayload(Encoding.UTF8.GetBytes(((string)eventData).ToString()), WebSocketMessageType.Text);
receiveMessageQueue.BufferPayload(mess);
}
messageEvent.Dispose();
});
// Attach the onMessage callaback
innerWebSocket.SetObjectProperty("onmessage", onMessage);
await tcsConnect.Task;
} catch (Exception wse) {
ConnectExceptionCleanup();
WebSocketException wex = new WebSocketException("WebSocket connection failure.", wse);
throw wex;
}
}
}
