public override async Task Join(IAsyncStreamReader <Message> requestStream, IServerStreamWriter <Message> responseStream, ServerCallContext context)
{
if (!await requestStream.MoveNext())
{
return;
}
do
{
_chatroomService.Join(requestStream.Current.User, responseStream);
await _chatroomService.BroadcastMessageAsync(requestStream.Current);
} while (await requestStream.MoveNext());
_chatroomService.Remove(context.Peer);
}