private async Task <(object result, bool state)> InternalCheckForFinish(CancellationToken token = default(CancellationToken))
{
(object result, bool done)r;
do
{
ITransactionProgress p = _chains[_index];
r = await p.CheckForFinishAsync(_input, token).ConfigureAwait(false);
if (r.done)
{
_index++;
if (_chains.Count == _index)
{
return(r);
}
_input = r.result;
}
} while (r.done);
return(r);
}
