public Subchain FindSubchain(byte[] hash, int length)
{
//todo: move this method to InternalBlockchain ?
using (BlockchainRepository repo = new BlockchainRepository(conn))
{
StoredBlock block = repo.FindBlockByHash(hash);
if (block == null)
{
return null;
}
List<StoredBlock> blocks = new List<StoredBlock>();
blocks.Add(block);
for (int i = 1; i < length; i++)
{
if (block.Header.IsFirst)
{
//genesis block is reached;
break;
}
block = repo.FindBlockByHash(block.Header.PrevBlock);
if (block == null)
{
throw new InvalidOperationException("The storage has a chain that starts with an invalid genesis block.");
}
blocks.Add(block);
}
blocks.Reverse();
return new Subchain(blocks);
}
}
public StoredBlock FindBlockByHash(byte[] hash)
{
using (BlockchainRepository repo = new BlockchainRepository(conn))
{
return repo.FindBlockByHash(hash);
}
}
