private static ImmutableList <Block <T> > GetFastForwardPath(
BlockChain <T> chain,
BlockHash originHash)
{
if (!chain.ContainsBlock(originHash))
{
throw new KeyNotFoundException(
$"Given chain {chain.Id} must contain origin hash {originHash}");
}
return(GetRewindPath(chain, originHash).Reverse());
}
private static ImmutableList <Block <T> > GetRewindPath(
BlockChain <T> chain,
BlockHash targetHash)
{
if (!chain.ContainsBlock(targetHash))
{
throw new KeyNotFoundException(
$"Given chain {chain.Id} must contain target hash {targetHash}");
}
Block <T> target = chain[targetHash];
List <Block <T> > path = new List <Block <T> >();
for (
Block <T> current = chain.Tip;
current.Index > target.Index && current.PreviousHash is { } ph;
current = chain[ph])
{
path.Add(current);
}
return(path.ToImmutableList());
}