private void Disconnect(SocketAsyncEventArgs e)
{
if (e.UserToken is TcpSession session)
{
try
{
session.Socket.Shutdown(SocketShutdown.Both);
}
catch (SocketException)
{
// this seems to randomly happen when the client disconnects. not always.
// there are other examples online of this being caught and ignored like this.
// see links at the top of the file
// TODO: log
}
session.Socket.Dispose();
var disconnectEventArgs = new ClientDisconnectedEventArgs(session);
OnClientDisconnected(disconnectEventArgs);
session.OnDisconnected(disconnectEventArgs);
Interlocked.Decrement(ref activeSessions);
}
if (e != null)
{
e.Completed -= FinishReceive;
e.UserToken = null;
e.SetBuffer(null, 0, 0);
socketEventPool.CheckIn(e);
}
}
private async Task SessionDisconnectedAsync(object sender, ClientDisconnectedEventArgs e)
{
// waiting for initialization proves self is non-null
WaitForInitialization();
await OnSessionDisconnected(e);
// need to clean up event hooks here so that this object can be GC'd
Session.DataReceived -= sessionDataReceived;
Session.Disconnected -= sessionDisconnected;
initialized.Dispose();
}
protected virtual void OnClientDisconnected(ClientDisconnectedEventArgs e)
{
ClientDisconnected?.Invoke(this, e);
}
internal virtual void OnDisconnected(ClientDisconnectedEventArgs e) => Disconnected?.Invoke(this, e);
protected abstract Task OnSessionDisconnected(ClientDisconnectedEventArgs e);