/// <summary>
/// Accepts the WebSocket connection.
/// This is a blocking call so it must be called within an independent thread.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="ct">The cancellation token.</param>
/// <returns>
/// A task that represents the asynchronous of websocket connection operation.
/// </returns>
public async Task AcceptWebSocket(IHttpContext context, CancellationToken ct)
{
// first, accept the websocket
$"{ServerName} - Accepting WebSocket . . .".Debug(nameof(WebSocketsServer));
var subProtocol = ResolveSubProtocol(context);
var webSocketContext =
await context.AcceptWebSocketAsync(ReceiveBufferSize, subProtocol).ConfigureAwait(false);
// remove the disconnected clients
CollectDisconnected();
lock (_syncRoot)
{
// add the newly-connected client
_mWebSockets.Add(webSocketContext);
}
$"{ServerName} - WebSocket Accepted - There are {WebSockets.Count} sockets connected.".Debug(
nameof(WebSocketsServer));
OnClientConnected(webSocketContext, context.Request.LocalEndPoint, context.Request.RemoteEndPoint);
try
{
if (webSocketContext.WebSocket is WebSocket systemWebSocket)
{
await ProcessSystemWebsocket(webSocketContext, systemWebSocket.SystemWebSocket, ct)
.ConfigureAwait(false);
}
else
{
await ProcessEmbedIOWebSocket(webSocketContext, ct).ConfigureAwait(false);
}
}
catch (TaskCanceledException)
{
// ignore
}
catch (Exception ex)
{
ex.Log(nameof(WebSocketsServer));
}
finally
{
// once the loop is completed or connection aborted, remove the WebSocket
RemoveWebSocket(webSocketContext);
}
}
