void DispatchBlock()
{
try
{
_Hasher.Pause("dispatching block");
MinerTrace.Information($"dispatching block with {_ValidatedTxs.Count()} txs");
var txs = FSharpList <Types.Transaction> .Cons(_Coinbase, ListModule.OfSeq(_ValidatedTxs.Select(TransactionValidation.unpoint)));
var block = new Types.Block(_Header, txs);
var result = new HandleBlockAction(block).Publish().Result.BkResultEnum;
if (result == BlockVerificationHelper.BkResultEnum.Accepted)
{
if (OnMined != null)
{
OnMined(block);
}
}
else
{
Reset();
}
MinerTrace.Information($" block {block.header.blockNumber} is " + result);
} catch (Exception e)
{
MinerTrace.Error("Dispatch block exception", e);
}
}
void Main()
{
MinerTrace.Information("Hasher started");
while (true)
{
if (_Header == null)
Pause("no header");
continueEvent.WaitOne();
if (_cancel.IsCancellationRequested)
{
break;
}
var time = DateTime.Now.ToUniversalTime();
var bkHash = Merkle.blockHeaderHasher.Invoke(_Header);
var c = 0;
if (Difficulty != 0)
{
var bits = new BitArray(bkHash);
var len = bits.Length - 1;
for (var i = 0; i < len; i++)
if (!bits[len - i])
c++;
else
break;
}
if (c >= Difficulty)
{
MinerTrace.Information($"Hasher solved a {Difficulty} difficulty");
if (OnMined != null)
OnMined();
}
else
{
//TODO: just increment the nonce, no need to ramdon again
var random = new Random();
random.NextBytes(_Header.nonce);
}
}
MinerTrace.Information("Hasher stopped");
}
void Populate()
{
_BlockChainListener.Pause();
_TransactionQueue.Clear();
lock (_BlockChain.memPool.TxPool)
{
foreach (var item in _BlockChain.memPool.TxPool)
{
_TransactionQueue.Push(item.Value);
}
}
MinerTrace.Information($"Populated, having {_TransactionQueue.Count} txs");
RecalculateHeader();
_BlockChainListener.Continue();
}
void OnBlockChainMessage(BlockChainMessage m)
{
_Hasher.Pause("BlockChain message");
if (m is TxMessage)
{
MinerTrace.Information($"Got tx ({((TxMessage)m).State})");
if (((TxMessage)m).State == TxStateEnum.Unconfirmed)
{
_TransactionQueue.Push(((TxMessage)m).Ptx);
}
RecalculateHeader();
}
else if (m is BlockMessage)
{
MinerTrace.Information("Got bk");
Reset();
}
}
void RecalculateHeader()
{
if (_BlockChain.Tip == null)
{
return;
}
if (_TransactionQueue.IsStuck)
{
MinerTrace.Information("Queue is stuck. count = " + _TransactionQueue.Count);
}
while (!_TransactionQueue.IsStuck && _ValidatedTxs.Count < TxsPerBlockLimit)
{
var ptx = _TransactionQueue.Take();
if (IsTransactionValid(ptx))
{
_ValidatedTxs.Add(ptx);
_TransactionQueue.Remove();
HandleTx(ptx);
}
else
{
MinerTrace.Information("Tx invalid");
_TransactionQueue.Next();
}
}
if (_ValidatedTxs.Count == 0)
{
MinerTrace.Information("No txs");
return; // don't allow empty blocks
}
CalculateCoinbase();
var txs = ListModule.OfSeq(FSharpList <Types.Transaction> .Cons(_Coinbase, ListModule.OfSeq(_ValidatedTxs.Select(TransactionValidation.unpoint))));
_Header = new Types.BlockHeader(
0,
_BlockChain.Tip.Key,
_BlockChain.Tip.Value.header.blockNumber + 1,
Merkle.merkleRoot(
new byte[] { },
Merkle.transactionHasher,
txs
),
new byte[] { },
new byte[] { },
ListModule.Empty <byte[]>(),
DateTime.Now.ToUniversalTime().Ticks,
Difficulty,
new byte[12]
);
MinerTrace.Information($"Mining block number {_BlockChain.Tip.Value.header.blockNumber + 1} with {_ValidatedTxs.Count()} txs");
_Hasher.SetHeader(_Header);
_Hasher.Continue();
}
bool IsTransactionValid(TransactionValidation.PointedTransaction ptx)
{
if (!HasUtxos(ptx))
{
MinerTrace.Information("could not validate tx - utxo missing");
return(false);
}
var utxoLookup = UtxoLookup.FromConverter(outpoint =>
{
var outputs = _UtxoSet.Where(t => t.Item1.Equals(outpoint)).Select(t => t.Item2);
return(!outputs.Any() ? FSharpOption <Types.Output> .None : new FSharpOption <Types.Output>(outputs.First()));
});
var contractLookup = FSharpFunc <byte[], FSharpOption <ContractFunction> > .FromConverter(contractHash =>
{
if (!_ActiveContracts.Contains(contractHash))
{
return(FSharpOption <ContractFunction> .None);
}
try
{
var code = new GetContractCodeAction(contractHash).Publish().Result;
//TODO: module name
var extration = ContractExamples.FStarExecution.extract(System.Text.Encoding.ASCII.GetString(code));
if (FSharpOption <string> .get_IsNone(extration))
{
MinerTrace.Information("Could not extract contract");
return(null);
}
var compilation = ContractExamples.FStarExecution.compile(extration.Value);
if (FSharpOption <byte[]> .get_IsNone(compilation))
{
MinerTrace.Information("Could not complie contract");
return(null);
}
return(ContractExamples.FStarExecution.deserialize(compilation.Value).Value.Item1);
}
catch (Exception e)
{
MinerTrace.Error("Could not compile contract " + Convert.ToBase64String(contractHash), e);
return(null);
}
});
if (!TransactionValidation.validateNonCoinbaseTx(
ptx,
utxoLookup,
contractLookup
))
{
MinerTrace.Information("could not validate tx");
return(false);
}
MinerTrace.Information("validated tx");
//TODO: memory management issues. trying to explicitly collect DynamicMethods
GC.Collect();
GC.WaitForPendingFinalizers();
return(true);
}
public void Continue()
{
MinerTrace.Information("Hasher resumed");
continueEvent.Set();
}
public void Pause(string reason)
{
MinerTrace.Information("Hasher paused: " + reason);
continueEvent.Reset();
}