// Pass in data that was encrypted at rest
// for upload to SAFENetwork.
public async Task <(NetworkEvent, Result <Pointer>)> Upload(WALContent walContent)
{
var data = ZipEncryptedEvent.From(walContent.EncryptedContent);
var localEvt = data.GetEvent(_pwd);
var networkEvt = await GetNetworkEvent(localEvt);
var expectedVersion = walContent.SequenceNr == 0 ? ExpectedVersion.None : ExpectedVersion.Specific(walContent.SequenceNr - 1);
var result = await _stream.TryAppendAsync(new StoredValue(networkEvt), expectedVersion);
return(networkEvt, result);
}
// new data from network.. this effectively means we have a fork..
// can we implement merge rules?
// Temporarily: only appending with new version nr at end.
// this will very likely lead to corrupted stream if any real
// concurrent usage of the drive occurs.
// TODO: Needs A LOT of work.
async Task <bool> TryMergeAsync(NetworkEvent evt, WALContent walContent)
{
var newData = await _service
.LoadAsync(evt.SequenceNr - 1)
.ToListAsync();
switch (evt)
{
case NetworkFileContentSet e when IsUnresolvableConflict(e, newData):
return(false);
case NetworkFileItemCreated e:
break;
case NetworkFileContentCleared e:
break;
case NetworkItemCopied e:
break;
case NetworkItemMoved e:
break;
case NetworkDirectoryItemCreated e:
break;
case NetworkItemRemoved e:
break;
case NetworkItemRenamed e:
break;
case null:
throw new ArgumentNullException(nameof(evt));
default:
throw new NotImplementedException(evt.GetType().Name);
}
// naively just try apply the remote changes
var caughtUp = await _materializer.Materialize(newData.ToAsyncEnumerable());
if (!caughtUp)
{
return(false);
}
walContent.SequenceNr = newData.Max(c => c.SequenceNr) + 1;
return(await Upload(walContent));
}
public async Task <bool> Upload(WALContent walContent)
{
var(e, result) = await _service.Upload(walContent);
switch (result)
{
case VersionMismatch <Pointer> mismatch:
return(await TryMergeAsync(e, walContent));
case var r when r.HasValue:
return(r.HasValue);
default:
return(result.HasValue);
}
}