public async Task <List <Transaction> > RollbackTransactions(Hash chainId, ulong currentHeight, ulong specificHeight)
{
var txs = new List <Transaction>();
for (var i = currentHeight - 1; i >= specificHeight; i--)
{
var rollBackBlockHash =
await _dataStore.GetAsync <Hash>(
DataPath.CalculatePointerForGettingBlockHashByHeight(chainId, i));
var header = await _dataStore.GetAsync <BlockHeader>(rollBackBlockHash);
var body = await _dataStore.GetAsync <BlockBody>(
Hash.Xor(
header.GetHash(), header.MerkleTreeRootOfTransactions));
foreach (var txId in body.Transactions)
{
var tx = await _dataStore.GetAsync <Transaction>(txId);
if (tx == null)
{
_logger?.Trace($"tx {txId} is null.");
}
txs.Add(tx);
await _dataStore.RemoveAsync <Transaction>(txId);
}
_logger?.Trace($"Rollback block hash: {rollBackBlockHash.Value.ToByteArray().ToHex()}");
}
return(txs);
}
public async Task <Block> GetNextBlockOf(Hash chainId, Hash blockHash)
{
var nextBlockHeight = (await GetBlockHeaderAsync(blockHash)).Index + 1;
var nextBlockHash = await _dataStore.GetAsync <Hash>(
DataPath.CalculatePointerForGettingBlockHashByHeight(chainId, nextBlockHeight));
return(await GetBlockAsync(nextBlockHash));
}
public async Task <Block> GetBlockByHeight(Hash chainId, ulong height)
{
_logger?.Trace($"Trying to get block by height {height}.");
var key = DataPath.CalculatePointerForGettingBlockHashByHeight(chainId, height);
if (key == null)
{
_logger?.Error($"Invalid block height - {height}.");
return(null);
}
var blockHash = await _dataStore.GetAsync <Hash>(key);
var blockHeader = await _dataStore.GetAsync <BlockHeader>(blockHash.OfType(HashType.BlockHeaderHash));
var blockBody = await _dataStore.GetAsync <BlockBody>(blockHash.OfType(HashType.BlockBodyHash));
return(new Block
{
Header = blockHeader,
Body = blockBody
});
}