public TransactionOut GetTransactionIn(BcBaseTransaction transaction, Networks network)
{
if (transaction == null)
{
throw new ArgumentNullException(nameof(transaction));
}
var blockChain = _blockChainStore.GetBlockChain();
foreach (var txIn in transaction.TransactionIn)
{
var nCbtxIn = txIn as TransactionInNoneCoinbase;
if (nCbtxIn == null || nCbtxIn.Outpoint == null)
{
continue;
}
var previousTx = blockChain.GetTransaction(nCbtxIn.Outpoint.Hash);
TransactionOut previousTxOut = null;
BcBaseTransaction monetaryTransaction = null;
if (previousTx == null || (monetaryTransaction = (previousTx as BcBaseTransaction)) == null || monetaryTransaction.TransactionOut == null)
{
previousTxOut = MemoryPool.Instance().GetUnspentTransaction(nCbtxIn.Outpoint.Hash, nCbtxIn.Outpoint.Index);
if (previousTxOut == null || (monetaryTransaction = (previousTx as BcBaseTransaction)) == null)
{
continue;
}
}
else
{
previousTxOut = monetaryTransaction.TransactionOut.ElementAtOrDefault((int)nCbtxIn.Outpoint.Index);
if (previousTxOut == null || previousTxOut.Script == null)
{
continue;
}
}
return(previousTxOut);
}
return(null);
}
internal NodeLauncher(Networks network, ServiceFlags serviceFlag, IRpcNodeFactory rpcNodeFactory, IBlockChainStore blockChainStore, IMessageCoordinator messageCoordinator, ISmartContractStore smartContractStore)
{
_network = network;
_serviceFlag = serviceFlag;
_p2pNetworkConnector = new P2PNetworkConnector(messageCoordinator);
_p2pNetworkConnector.ConnectEvent += P2PConnectEvent;
_p2pNetworkConnector.DisconnectEvent += P2PDisconnectEvent;
_p2pNode = new P2PNode(_network, _serviceFlag, _p2pNetworkConnector, messageCoordinator);
_rpcNode = rpcNodeFactory.Build(_network);
blockChainStore.Switch(network);
smartContractStore.Switch(network);
_blockChain = blockChainStore.GetBlockChain();
}
public void Check(Block block)
{
if (block == null)
{
throw new ArgumentNullException(nameof(block));
}
var merkleRoot = block.BlockHeader.MerkleRoot; // Check MERKLE-ROOT.
var calculatedMerkleRoot = block.GetMerkleRoot();
if (!merkleRoot.SequenceEqual(calculatedMerkleRoot))
{
throw new ValidationException(ErrorCodes.InvalidMerkleRoot);
}
var blockChain = _blockChainStore.GetBlockChain(); // Check PREVIOUS BLOCK.
var currentBlock = blockChain.GetCurrentBlock();
if (!currentBlock.GetHashHeader().SequenceEqual(block.BlockHeader.PreviousBlockHeader))
{
throw new ValidationException(ErrorCodes.InvalidPreviousHashHeader);
}
var hash = currentBlock.GetHashHeader();
var currentNBits = Constants.DEFAULT_NBITS; // TODO : CALCULATE THE DEFAULT NBITS : https://bitcoin.org/en/developer-guide#proof-of-work
var target = TargetHelper.GetTarget(currentNBits);
if (!TargetHelper.IsValid(hash, target))
{
throw new ValidationException(ErrorCodes.NotEnoughDifficult);
}
foreach (var transaction in block.Transactions) // Check ALL TRANSACTIONS.
{
_transactionValidator.Check(transaction);
}
}
private JObject GetBlockTemplate(JObject response)
{
var transactions = MemoryPool.Instance().GetTransactions();
var blockChain = _blockChainStore.GetBlockChain();
if (transactions == null || !transactions.Any())
{
response["result"] = null;
return(response);
}
var currentBlock = blockChain.GetCurrentBlock();
var height = blockChain.GetCurrentBlockHeight();
var previousBlockHash = currentBlock.GetHashHeader().ToHexString();
var transactionBuilder = new TransactionBuilder();
var nonce = BitConverter.GetBytes(NonceHelper.GetNonceUInt64());
var value = transactions.Sum(t => _transactionHelper.GetFee(t.Transaction, _network));
var coinBaseTransaction = transactionBuilder.NewCoinbaseTransaction()
.SetInput((uint)height + 1, nonce)
.AddOutput(value, Script.CreateCorrectScript())
.Build();
var result = new JObject();
var jTransactions = new JArray();
foreach (var transaction in transactions)
{
jTransactions.Add(transaction.Transaction.Serialize().ToHexString());
}
var currentTime = DateTime.UtcNow.ToUnixTimeUInt32();
var coinBaseTxnObj = new JObject();
coinBaseTxnObj.Add("data", coinBaseTransaction.Serialize().ToHexString());
result.Add("coinbasetxn", coinBaseTxnObj);
result.Add("expires", "120");
result.Add("longpollid", "");
result.Add("height", blockChain.GetCurrentBlockHeight() + 1);
result.Add("curtime", currentTime);
result.Add("previousblockhash", previousBlockHash);
result.Add("transactions", jTransactions);
result.Add("version", BlockHeader.CURRENT_VERSION);
result.Add("target", TargetHelper.GetTarget(Constants.DEFAULT_NBITS).ToHexString());
result.Add("bits", Constants.DEFAULT_NBITS);
response["result"] = result;
return(response);
}
public void Check(BcBaseTransaction transaction)
{
if (transaction == null)
{
throw new ArgumentNullException(nameof(transaction));
}
var blockChain = _blockChainStore.GetBlockChain();
var memoryPool = MemoryPool.Instance();
var isCoinBaseTransaction = transaction is CoinbaseTransaction; // https://bitcoin.org/en/developer-guide#block-chain-overview
if (!isCoinBaseTransaction && (transaction.TransactionIn == null || !transaction.TransactionIn.Any()))
{
throw new ValidationException(ErrorCodes.NoTransactionIn);
}
if (!isCoinBaseTransaction)
{
long totalOutput = 0;
foreach (var txIn in transaction.TransactionIn)
{
var noneCoinBaseTxIn = txIn as TransactionInNoneCoinbase; // Check TRANSACTION EXISTS IN BLOCK CHAIN & MEMORY POOL.
var previousTxId = noneCoinBaseTxIn.Outpoint.Hash;
var previousIndex = noneCoinBaseTxIn.Outpoint.Index;
/*
* if (memoryPool.ContainsTransactions(previousTxId, previousIndex))
* {
* throw new ValidationException(ErrorCodes.AlreadySpentInMemoryPool);
* }
*/
var previousTxOut = blockChain.GetUnspentTransaction(previousTxId, previousIndex);
if (previousTxOut == null)
{
var r = memoryPool.GetUnspentTransaction(previousTxId, previousIndex) as TransactionOut;
if (r == null)
{
throw new ValidationException(ErrorCodes.ReferencedTransactionNotValid);
}
previousTxOut = new UTXO
{
Index = (int)previousIndex,
Script = r.Script,
TxId = transaction.GetTxId(),
Value = r.Value
};
}
var sigScript = Script.Deserialize(noneCoinBaseTxIn.SignatureScript); // Check SCRIPT.
var pkScript = previousTxOut.Script;
if (!_scriptInterpreter.Check(sigScript, pkScript))
{
throw new ValidationException(ErrorCodes.TransactionSignatureNotCorrect);
}
totalOutput += previousTxOut.Value;
}
var sumOutput = transaction.TransactionOut.Where(t => t is TransactionOut).Sum(t => ((TransactionOut)t).Value);
if (sumOutput > totalOutput)
{
throw new ValidationException(ErrorCodes.TransactionOutputExceedInput);
}
}
}
public Message Receive(Message message, PeerConnector peer, P2PNetworkConnector p2pNetworkConnector)
{
var blockChain = _blockChainStore.GetBlockChain();
var smartContract = _smartContractStore.GetSmartContracts();
if (message.GetCommandName() == Constants.MessageNames.Version) // RETURNS VERSION.
{
var msg = message as VersionMessage;
var instance = PeersStore.Instance();
var transmittingNode = instance.GetMyIpAddress();
var receivingNode = msg.TransmittingNode;
return(new VersionMessage(transmittingNode, receivingNode, msg.Nonce, msg.UserAgent, msg.StartHeight, msg.Relay, msg.MessageHeader.Network));
}
if (message.GetCommandName() == Constants.MessageNames.Ping) // RETURNS PONG.
{
var msg = message as PingMessage;
var pong = new PongMessage(msg.Nonce, msg.MessageHeader.Network);
return(pong);
}
if (message.GetCommandName() == Constants.MessageNames.Verack) // RETURNS VERACK MESSAGE.
{
var msg = message as VerackMessage;
return(new VerackMessage(msg.MessageHeader.Network));
}
if (message.GetCommandName() == Constants.MessageNames.Addr) // RETURNS THE ADDRS.
{
var msg = message as AddrMessage;
if (msg.IpAddresses != null)
{
foreach (var ipAddress in msg.IpAddresses)
{
PeerEventStore.Instance().NewPeer(ipAddress);
}
}
return(null);
}
if (message.GetCommandName() == Constants.MessageNames.GetAddr) // RETURNS THE ADDRS.
{
var msg = message as GetAddressMessage;
var ipAdrLst = _peersStorage.GetAll();
var response = new AddrMessage(new CompactSize {
Size = (ulong)ipAdrLst.Count()
}, msg.MessageHeader.Network);
foreach (var ipAdr in ipAdrLst)
{
response.IpAddresses.Add(ipAdr);
}
return(response);
}
if (message.GetCommandName() == Constants.MessageNames.MemPool) // RETURNS THE INVENTORY.
{
var msg = message as MemPoolMessage;
var memoryPool = MemoryPool.Instance();
var txIds = memoryPool.GetTransactions().Select(t => t.Transaction.GetTxId());
var inventories = new List <Inventory>();
foreach (var txId in txIds)
{
inventories.Add(new Inventory(InventoryTypes.MSG_TX, txId));
}
return(new InventoryMessage(inventories, msg.MessageHeader.Network));
}
if (message.GetCommandName() == Constants.MessageNames.GetData) // RETURNS ALL THE DATA TO THE PEER.
{
var msg = message as GetDataMessage;
var messages = Execute(msg);
if (messages != null)
{
foreach (var m in messages)
{
peer.Execute(m.Serialize());
}
}
return(null);
}
if (message.GetCommandName() == Constants.MessageNames.Transaction) // ADD TRANSACTION INTO MEMORY POOL & BROADCAST IT.
{
var msg = message as TransactionMessage;
AddTransaction(msg.Transaction);
MemoryPool.Instance().Remove(msg.Transaction);
p2pNetworkConnector.Broadcast(msg.Transaction, msg.MessageHeader.Ipv6);
return(null);
}
if (message.GetCommandName() == Constants.MessageNames.Block) // ADD THE BLOCK.
{
var msg = message as BlockMessage;
_blockValidator.Check(msg.Block);
if (msg.Block.Transactions != null)
{
MemoryPool.Instance().Remove(msg.Block.Transactions.Select(tx => tx.GetTxId()));
}
smartContract.AddBlock(msg.Block);
smartContract.Commit();
blockChain.AddBlock(msg.Block);
}
if (message.GetCommandName() == Constants.MessageNames.NotFound) // SOME INVENTORIES ARE NOT FOUND.
{
return(null);
}
if (message.GetCommandName() == Constants.MessageNames.GetBlocks) // RETURN THE BLOCKS : https://bitcoin.org/en/developer-reference#getblocks
{
var msg = message as GetBlocksMessage;
int lastBlockHeight = -1;
foreach (var blockHash in msg.BlockHashes)
{
lastBlockHeight = blockChain.GetBlockHeight(blockHash);
if (lastBlockHeight != -1)
{
goto Found;
}
}
Found:
var currentBlockHeight = blockChain.GetCurrentBlockHeight();
if (currentBlockHeight == lastBlockHeight)
{
return(new InventoryMessage(new List <Inventory>(), msg.MessageHeader.Network));
}
var nbBlocks = currentBlockHeight - lastBlockHeight;
if (lastBlockHeight == -1)
{
nbBlocks = currentBlockHeight - 1;
}
if (nbBlocks > Constants.DEFAULT_MAX_GET_INVENTORIES)
{
nbBlocks = Constants.DEFAULT_MAX_GET_INVENTORIES;
}
var blocks = blockChain.GetLastBlocks(nbBlocks);
var inventories = new List <Inventory>();
foreach (var block in blocks)
{
inventories.Add(new Inventory(InventoryTypes.MSG_BLOCK, block.GetHashHeader()));
}
return(new InventoryMessage(inventories, msg.MessageHeader.Network));
}
return(null);
}