/// <inheritdoc/>
public void StoreStateReference <T>(
string @namespace,
IImmutableSet <Address> addresses,
Block <T> block)
where T : IAction, new()
{
int hashSize = HashDigest <SHA256> .Size;
byte[] hashBytes = block.Hash.ToByteArray();
byte[] indexBytes = BitConverter.GetBytes(block.Index);
foreach (Address address in addresses)
{
string addrHex = address.ToHex();
var fileId = $"{StateRefIdPrefix}{@namespace}/{addrHex}";
if (!_db.FileStorage.Exists(fileId))
{
_db.FileStorage.Upload(
fileId,
addrHex,
new MemoryStream());
}
LiteFileInfo file = _db.FileStorage.FindById(fileId);
using (var temp = new MemoryStream())
{
file.CopyTo(temp);
temp.Seek(0, SeekOrigin.Begin);
byte[] prev = temp.ToArray();
using (LiteFileStream stream = file.OpenWrite())
{
stream.Write(prev, 0, prev.Length);
stream.Write(hashBytes, 0, hashSize);
stream.Write(indexBytes, 0, sizeof(long));
}
}
}
}
/// <inheritdoc/>
public void ForkStateReferences <T>(
string srcNamespace,
string destNamespace,
Block <T> branchPoint,
IImmutableSet <Address> addressesToStrip)
where T : IAction, new()
{
long branchPointIndex = branchPoint.Index;
List <LiteFileInfo> files =
_db.FileStorage
.Find($"{StateRefIdPrefix}{srcNamespace}")
.ToList();
if (!files.Any() && addressesToStrip.Any())
{
throw new NamespaceNotFoundException(
srcNamespace,
"The source namespace to be forked does not exist.");
}
foreach (LiteFileInfo srcFile in files)
{
string destId =
$"{StateRefIdPrefix}{destNamespace}/{srcFile.Filename}";
_db.FileStorage.Upload(
destId,
srcFile.Filename,
new MemoryStream());
LiteFileInfo destFile = _db.FileStorage.FindById(destId);
using (LiteFileStream srcStream = srcFile.OpenRead())
using (LiteFileStream destStream = destFile.OpenWrite())
{
while (srcStream.Position < srcStream.Length)
{
var hashBytes = new byte[HashDigest <SHA256> .Size];
var indexBytes = new byte[sizeof(long)];
srcStream.Read(hashBytes, 0, hashBytes.Length);
srcStream.Read(indexBytes, 0, indexBytes.Length);
long currentIndex =
BitConverter.ToInt64(indexBytes, 0);
if (currentIndex <= branchPointIndex)
{
destStream.Write(hashBytes, 0, hashBytes.Length);
destStream.Write(indexBytes, 0, indexBytes.Length);
}
else
{
break;
}
}
}
if (destFile.Length == 0)
{
_db.FileStorage.Delete(destId);
}
}
}