private async Task <BlockHashed> GenerateBlock(BlockHashed previousBlock, int?threads = null)
{
var miner = _minerFactory.Create(_address, previousBlock, new TransactionSigned[] { }, _feedback);
miner.Start(threads ?? Environment.ProcessorCount);
return(await miner.GetBlock());
}
//Fire and forget
private void BroadcastToPeer(BlockHashed block, PeerConnection peer)
{
Debug.WriteLine($"Enqueue block {block.Signed.Data.Index}");
var queuedTask = peer.Client.BroadcastAsync(new BlockBundle(block, _peerUrl));
Debug.WriteLine($"Block {block.Signed.Data.Index} enqueued");
FireBroadCast(peer, queuedTask);
}
public Task BroadcastAsync(BlockHashed block)
{
foreach (var peer in _peers.Values)
{
BroadcastToPeer(block, peer);
}
return(Task.CompletedTask);
}
public static HashBits CalculateTargetHash(BlockHashed lastBlock, BlockData blockToProcess)
{
var targetHashBits =
lastBlock.Signed.HashTargetBits.Adjust(
blockToProcess.TimeStamp - lastBlock.Signed.Data.TimeStamp,
BlockData.BlockTime);
return(targetHashBits);
}
private void AddNewBlock(BlockHashed newBlock)
{
_feedback.Execute("AddNewBlock",
() =>
{
//TODO: Any chance the block to need sync here? Rely on AcceptBlockAsync for now
_chainData.AddNewBlock(newBlock);
},
() => $"{nameof(newBlock)}: {newBlock.SerializeToJson()}");
}
private BlockData GetNewBlock(Address inFavor, BlockHashed lastBlock, IEnumerable <TransactionSigned> transactionsToProcess)
{
var transactions = GetNewBlockTransactions(inFavor, lastBlock, transactionsToProcess);
var blockToProcess = new BlockData(
lastBlock.Signed.Data.Index + 1,
DateTime.UtcNow.Ticks,
"^v^",
transactions.ToArray(),
lastBlock.HashTarget.Hash);
return(blockToProcess);
}
public Miner Create(
Address inFavor,
BlockHashed lastBlock,
IEnumerable <TransactionSigned> transactionsToProcess,
IFeedback feedback)
{
var blockToProcess = GetNewBlock(inFavor, lastBlock, transactionsToProcess);
var targetHashBits = Rules.CalculateTargetHash(lastBlock, blockToProcess);
var signedBlock = _cryptography.SignBlock(blockToProcess, inFavor, targetHashBits);
return(Create(signedBlock, feedback));
}
public bool ValidateGenesisBlock(BlockHashed newBlock, out BlockchainState blockchainState)
{
var expectedSignedGenesis = Genesis.GetBlockData(_cryptography, newBlock.Signed.Data.TimeStamp);
var result = ValidateParent(0, Genesis.Hash, newBlock.Signed.Data,
out blockchainState);
if (result)
{
ValidateSignature(expectedSignedGenesis.Stamp, newBlock.Signed);
ValidateBlockHash(expectedSignedGenesis, newBlock.HashTarget);
}
return(result);
}
public bool ValidateNewBlock(BlockHashed lastBlock, BlockHashed newBlock, out BlockchainState blockchainState)
{
var result = ValidateParent(lastBlock.Signed.Data.Index + 1, lastBlock.HashTarget.Hash, newBlock.Signed.Data,
out blockchainState);
if (result)
{
ValidateHashTarget(lastBlock, newBlock);
ValidateSignature(newBlock.Signed.Stamp, newBlock.Signed);
ValidateBlockHash(newBlock);
ValidateTransactions(newBlock.Signed.Data.Transactions);
}
return(result);
}
public void ValidateHashTarget(BlockHashed lastBlock, BlockHashed newBlock)
{
var targetHashBits = Rules.CalculateTargetHash(lastBlock, newBlock.Signed.Data);
if (newBlock.Signed.HashTargetBits.Value != targetHashBits.Value)
{
throw new BlockchainValidationException("Block target hash bits are not valid");
}
var targetHash = newBlock.Signed.HashTargetBits.ToHash();
if (newBlock.HashTarget.Hash.Compare(targetHash) >= 0)
{
throw new BlockchainValidationException("Block hash is not below a necessary target");
}
}
public static async Task Encrypt(Stream stream, long length)
{
int step = (int)Math.Ceiling(length / 100d);
int readBytes;
var readTime = new Stopwatch();
var SHA256Time = new Stopwatch();
var KHATime = new Stopwatch();
do
{
byte[] blockBytes = new byte[step];
readTime.Start();
readBytes = await stream.ReadAsync(blockBytes, 0, step);
readTime.Stop();
if (readBytes != step)
{
blockBytes = blockBytes.Take(readBytes).ToArray();
}
SHA256Time.Start();
string kha = await GetKHA(blockBytes);
SHA256Time.Stop();
KHATime.Start();
string sha256 = await GetSHA512(blockBytes);
KHATime.Stop();
BlockHashed?.Invoke(
kha,
sha256);
} while (readBytes > 0);
var lengthKb = length / 1000.0;
AllFileHashed?.Invoke(
lengthKb / readTime.ElapsedMilliseconds,
lengthKb / KHATime.ElapsedMilliseconds,
lengthKb / SHA256Time.ElapsedMilliseconds
);
}
private bool ValidateBlock(BlockHashed newBlock, BlockHashed lastBlock, out BlockchainState blockchainState)
{
bool result;
if (lastBlock == null)
{
result = ValidateGenesisBlock(newBlock, out blockchainState);
}
else
{
result = ValidateNewBlock(lastBlock, newBlock, out blockchainState);
if (result)
{
RemovePendingTransactions(newBlock.Signed.Data.Transactions);
}
}
return(result);
}
public BlockchainState AddNewBlock(BlockHashed newBlock)
{
var lastBlock = GetLastBlock();
var blockTime = newBlock.Signed.Data.TimeStamp - lastBlock?.Signed.Data.TimeStamp ?? 0;
try
{
if (ValidateBlock(newBlock, lastBlock, out var blockchainState))
{
Chain.Add(newBlock);
_feedback.NewBlockAccepted(newBlock.Signed.Data.Index, blockTime, newBlock.HashTarget.Hash);
}
return(blockchainState);
}
catch (BlockchainValidationException e)
{
_feedback.NewBlockRejected(newBlock.Signed.Data.Index, blockTime, newBlock.HashTarget.Hash, e.Message);
}
return(BlockchainState.ValidationError);
}
public async Task <Miner> MineAsync(Address mineAddress, int?numberOfThreads, BlockHashed lastBlock, IEnumerable <TransactionSigned> transactions)
{
var miner = MinerFactory.Create(mineAddress, lastBlock, transactions, _feedback);
var threadsClosure = numberOfThreads;
await _feedback.Execute("Mine",
() => MineAsync(miner, threadsClosure),
() => $"{nameof(mineAddress)}: {mineAddress}, {nameof(numberOfThreads)}: {threadsClosure}");
return(miner);
}
//TODO: Allow multiple recipients
private IEnumerable <TransactionSigned> GenerateCoinbaseTransaction(Address inFavor, BlockHashed lastBlock)
{
var mineReward = new[]
{
_cryptography.Sign(
new Transaction(
Genesis.God,
new[] { new Recipient(inFavor, Rules.CalulateBlockReward(lastBlock)) },
0),
inFavor),
};
return(mineReward);
}
private IEnumerable <TransactionSigned> GetNewBlockTransactions(Address inFavor, BlockHashed lastBlock, IEnumerable <TransactionSigned> transactionsToProcess)
{
var mineReward = GenerateCoinbaseTransaction(inFavor, lastBlock);
var transactions = mineReward.Union(transactionsToProcess);
return(transactions);
}
public void ValidateBlockHash(BlockHashed newBlock)
{
ValidateBlockHash(newBlock.Signed, newBlock.HashTarget);
}
public static BlockIdentity Identity(this BlockHashed block)
{
return(block == null ? null : new BlockIdentity(block.Signed.Data.Index, block.HashTarget.Hash));
}
public BlockBundle(BlockHashed block, string sender)
{
Block = block;
Sender = sender;
}
public static long CalulateBlockReward(BlockHashed lastBlock)
{
var rewardReduction = lastBlock.Signed.Data.Index / Transaction.BlockCountRewardReduction;
return(Genesis.Reward >> rewardReduction);
}