/// <summary>
/// Closes the transport.
/// </summary>
/// <param name="cancellationToken"></param>
/// <returns></returns>
/// <exception cref="System.NotImplementedException"></exception>
protected override Task PerformCloseAsync(CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
_stream?.Close();
_tcpClient.Close();
return(_envelopePipe.StopAsync(cancellationToken));
}
/// <summary>
/// Closes the transport, implementing the websocket close handshake.
/// </summary>
/// <param name="cancellationToken"></param>
/// <returns></returns>
/// <exception cref="InvalidOperationException">The listener is not active</exception>
protected override async Task PerformCloseAsync(CancellationToken cancellationToken)
{
await _closeSemaphore.WaitAsync(cancellationToken);
try
{
await _envelopePipe.StopAsync(cancellationToken);
// Awaits for the client to send the close connection frame.
// If the session was clearly closed, the client should received the finished envelope and is closing the connection.
using (var cts = new CancellationTokenSource(CloseTimeout))
using (var linkedCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, cts.Token))
{
if (WebSocket.State == WebSocketState.Open ||
WebSocket.State == WebSocketState.CloseReceived)
{
if (_closeGracefully)
{
await
WebSocket.CloseAsync(_closeStatus, _closeStatusDescription, linkedCts.Token)
.ConfigureAwait(false);
}
else
{
await
WebSocket.CloseOutputAsync(_closeStatus, _closeStatusDescription, linkedCts.Token)
.ConfigureAwait(false);
}
}
}
}
finally
{
_closeSemaphore.Release();
}
}