public void Can_calculate_signers_count()
{
BlockHeader header = BuildCliqueBlock();
for (int i = 0; i < 5; i++)
{
int signersCount = header.CalculateSignersCount();
Assert.AreEqual(i, signersCount);
byte[] newExtraData = new byte[header.ExtraData.Length + Address.ByteLength];
header.ExtraData = newExtraData;
}
}
internal Snapshot GetOrCreateSnapshot(UInt256 number, Keccak hash)
{
// Search for a snapshot in memory or on disk for checkpoints
List <BlockHeader> headers = new List <BlockHeader>();
Snapshot snapshot;
while (true)
{
snapshot = GetSnapshot(number, hash);
if (snapshot != null)
{
break;
}
// If we're at an checkpoint block, make a snapshot if it's known
BlockHeader header = _blockTree.FindHeader(hash);
if (header == null)
{
throw new InvalidOperationException("Unknown ancestor");
}
if (header.Hash == null)
{
throw new InvalidOperationException("Block tree block without hash set");
}
Keccak parentHash = header.ParentHash;
if (number == 0 || (IsEpochTransition(number) && _blockTree.FindHeader(parentHash) == null))
{
int signersCount = header.CalculateSignersCount();
SortedList <Address, UInt256> signers = new SortedList <Address, UInt256>(signersCount, CliqueAddressComparer.Instance);
for (int i = 0; i < signersCount; i++)
{
Address signer = new Address(header.ExtraData.Slice(Clique.ExtraVanityLength + i * AddressLength, AddressLength));
signers.Add(signer, UInt256.Zero);
}
snapshot = new Snapshot(_config, _signatures, number, header.Hash, signers);
snapshot.Store(_blocksDb);
break;
}
// No snapshot for this header, gather the header and move backward
headers.Add(header);
number = number - 1;
hash = header.ParentHash;
}
// Previous snapshot found, apply any pending headers on top of it
for (int i = 0; i < headers.Count / 2; i++)
{
BlockHeader temp = headers[headers.Count - 1 - i];
headers[headers.Count - 1 - i] = headers[i];
headers[i] = temp;
}
for (int i = 0; i < headers.Count; i++)
{
headers[i].Author = headers[i].Author ?? GetBlockSealer(headers[i]);
}
snapshot = snapshot.Apply(headers);
_recent.Set(snapshot.Hash, snapshot);
// If we've generated a new checkpoint snapshot, save to disk
if ((ulong)snapshot.Number % Clique.CheckpointInterval == 0 && headers.Count > 0)
{
snapshot.Store(_blocksDb);
}
return(snapshot);
}
