public SocketEventSession(DEServer server, IDEWebSocketScope context)
: base(server)
{
this.context = context ?? throw new ArgumentNullException(nameof(context));
synchronizationContext = SynchronizationContext.Current ?? throw new ArgumentNullException("SynchronizationContext.Current");
} // ctor
} // proc CleanOutdatedEvents
#endregion
#region -- WebSocket Events ---------------------------------------------------
public async Task ExecuteWebSocketAsync(IDEWebSocketScope webSocket)
{
if (eventSessionsClosing)
{
return;
}
// create event session
var eventSession = new SocketEventSession(this, webSocket);
try
{
var ws = webSocket.WebSocket;
var recvOffset = 0;
var recvBuffer = new byte[16 << 10];
var segment = WebSocket.CreateServerBuffer(1024);
while (ws.State == WebSocketState.Open)
{
var rest = recvBuffer.Length - recvOffset;
if (rest <= 0)
{
await ws.CloseAsync(WebSocketCloseStatus.ProtocolError, "Message to big", CancellationToken.None);
}
else
{
var r = await ws.ReceiveAsync(new ArraySegment <byte>(recvBuffer, recvOffset, rest), CancellationToken.None);
if (r.MessageType == WebSocketMessageType.Text) // message as relative uri
{
recvOffset += r.Count;
if (r.EndOfMessage)
{
try
{
var leadingZeros = 0;
var endSegment = segment.Offset + recvOffset;
for (var i = segment.Offset; i < endSegment; i++)
{
if (segment.Array[i] != 0)
{
break;
}
leadingZeros++;
}
await eventSession.ExecuteCommandAsync(Encoding.UTF8.GetString(segment.Array, leadingZeros, recvOffset - leadingZeros));
}
catch (Exception e)
{
Log.Except("Command failed: ", e);
}
finally
{
recvOffset = 0;
}
}
}
}
}
}
catch (Exception e)
{
if (e.InnerException is HttpListenerException le)
{
if (le.NativeErrorCode != 995)
{
Log.Warn($"Event Socket failed.", le);
}
}
else
{
Log.Warn("Event Socket failed.", e);
}
}
} // func AcceptWebSocket