private async Task HubOnDisconnectedAsync(HubConnectionContext connection, Exception?exception)
{
// send close message before aborting the connection
await SendCloseAsync(connection, exception, connection.AllowReconnect);
// We wait on abort to complete, this is so that we can guarantee that all callbacks have fired
// before OnDisconnectedAsync
// Ensure the connection is aborted before firing disconnect
await connection.AbortAsync();
try
{
await _dispatcher.OnDisconnectedAsync(connection, exception);
}
catch (Exception ex)
{
Log.ErrorDispatchingHubEvent(_logger, "OnDisconnectedAsync", ex);
throw;
}
}
private async Task RunHubAsync(HubConnectionContext connection)
{
try
{
await _dispatcher.OnConnectedAsync(connection);
}
catch (Exception ex)
{
Log.ErrorDispatchingHubEvent(_logger, "OnConnectedAsync", ex);
// The client shouldn't try to reconnect given an error in OnConnected.
await SendCloseAsync(connection, ex, allowReconnect : false);
// return instead of throw to let close message send successfully
return;
}
try
{
await DispatchMessagesAsync(connection);
}
catch (OperationCanceledException)
{
// Don't treat OperationCanceledException as an error, it's basically a "control flow"
// exception to stop things from running
}
catch (Exception ex)
{
Log.ErrorProcessingRequest(_logger, ex);
await HubOnDisconnectedAsync(connection, ex);
// return instead of throw to let close message send successfully
return;
}
await HubOnDisconnectedAsync(connection, connection.CloseException);
}
