public async Task ConnectAsync(Uri uri, CancellationToken cancellationToken, ClientWebSocketOptions options)
{
InterlockedCheckAndUpdateState(WebSocketState.Connecting, s_validConnectStates);
CheckValidState(s_validConnectingStates);
_messageWebSocket = new MessageWebSocket();
foreach (var header in options.RequestHeaders)
{
_messageWebSocket.SetRequestHeader((string)header, options.RequestHeaders[(string)header]);
}
string cookies = options.Cookies == null ? null : options.Cookies.GetCookieHeader(uri);
if (!string.IsNullOrEmpty(cookies))
{
_messageWebSocket.SetRequestHeader(HeaderNameCookie, cookies);
}
var websocketControl = _messageWebSocket.Control;
foreach (var subProtocol in options.RequestedSubProtocols)
{
websocketControl.SupportedProtocols.Add(subProtocol);
}
if (options.ClientCertificates.Count > 0)
{
if (!MessageWebSocketClientCertificateSupported)
{
throw new PlatformNotSupportedException(string.Format(CultureInfo.InvariantCulture,
SR.net_WebSockets_UWPClientCertSupportRequiresWindows10GreaterThan1703));
}
X509Certificate2 dotNetClientCert = CertificateHelper.GetEligibleClientCertificate(options.ClientCertificates);
if (dotNetClientCert != null)
{
RTCertificate winRtClientCert = await CertificateHelper.ConvertDotNetClientCertToWinRtClientCertAsync(dotNetClientCert).ConfigureAwait(false);
if (winRtClientCert == null)
{
throw new PlatformNotSupportedException(string.Format(
CultureInfo.InvariantCulture,
SR.net_WebSockets_UWPClientCertSupportRequiresCertInPersonalCertificateStore));
}
websocketControl.ClientCertificate = winRtClientCert;
}
}
// Try to opt into PartialMessage receive mode so that we can hand partial data back to the app as it arrives.
// If the MessageWebSocketControl.ReceiveMode API surface is not available, the MessageWebSocket.MessageReceived
// event will only get triggered when an entire WebSocket message has been received. This results in large memory
// footprint and prevents "streaming" scenarios (e.g., WCF) from working properly.
if (MessageWebSocketReceiveModeSupported)
{
// Always enable partial message receive mode if the WinRT API supports it.
_messageWebSocket.Control.ReceiveMode = MessageWebSocketReceiveMode.PartialMessage;
}
try
{
_receiveAsyncBufferTcs = new TaskCompletionSource <ArraySegment <byte> >();
_closeWebSocketReceiveResultTcs = new TaskCompletionSource <WebSocketReceiveResult>();
_messageWebSocket.MessageReceived += OnMessageReceived;
_messageWebSocket.Closed += OnCloseReceived;
await _messageWebSocket.ConnectAsync(uri).AsTask(cancellationToken).ConfigureAwait(false);
_subProtocol = _messageWebSocket.Information.Protocol;
_messageWriter = new DataWriter(_messageWebSocket.OutputStream);
}
catch (Exception)
{
UpdateState(WebSocketState.Closed);
throw;
}
UpdateState(WebSocketState.Open);
}
