public IRpcMethodResult GetDifficulty()
{
try
{
var blockComponent = new BlockComponent();
var height = blockComponent.GetLatestHeight();
var newHeight = height + 1;
var previousBlock = blockComponent.GetBlockMsgByHeight(height);
var prev4032Block = blockComponent.GetBlockMsgByHeight(newHeight - POW.DiffiucltyAdjustStep);
long prevBits = 0;
if (previousBlock != null)
{
prevBits = previousBlock.Header.Bits;
}
var work = new POW(newHeight);
var bits = work.CalculateNextWorkTarget(height, prevBits, prev4032Block);
var target = work.ConvertBitsToBigInt(bits).ToString("X").PadLeft(64, '0');
var result = new GetDifficultyOM()
{
height = newHeight,
hashTarget = target
};
return(Ok(result));
}
catch (CommonException ce)
{
return(Error(ce.ErrorCode, ce.Message, ce));
}
catch (Exception ex)
{
return(Error(ErrorCode.UNKNOWN_ERROR, ex.Message, ex));
}
}
public BlockMsg CreateNewBlock(string minerName, string accountId = null)
{
var accountDac = new AccountDac();
var blockDac = new BlockDac();
var outputDac = new OutputDac();
var txDac = new TransactionDac();
var txPool = TransactionPool.Instance;
var transactionMsgs = new List <TransactionMsg>();
long lastBlockHeight = -1;
string lastBlockHash = Base16.Encode(HashHelper.EmptyHash());
long lastBlockBits = -1;
var blockEntity = blockDac.SelectLast();
if (blockEntity != null)
{
lastBlockHeight = blockEntity.Height;
lastBlockHash = blockEntity.Hash;
lastBlockBits = blockEntity.Bits;
}
long totalSize = 0;
long maxSize = BlockSetting.MAX_BLOCK_SIZE - (500 * 1024);
var poolItemList = txPool.MainPool.OrderByDescending(t => t.FeeRate).ToList();
var index = 0;
while (totalSize < maxSize && index < poolItemList.Count)
{
var tx = poolItemList[index].Transaction;
if (tx != null && transactionMsgs.Where(t => t.Hash == tx.Hash).Count() == 0)
{
if (txDac.SelectByHash(tx.Hash) == null)
{
transactionMsgs.Add(tx);
totalSize += tx.Size;
}
else
{
txPool.RemoveTransaction(tx.Hash);
}
}
else
{
break;
}
index++;
}
var minerAccount = accountDac.SelectDefaultAccount();
if (accountId != null)
{
var account = accountDac.SelectById(accountId);
if (account != null && !string.IsNullOrWhiteSpace(account.PrivateKey))
{
minerAccount = account;
}
}
BlockMsg newBlockMsg = new BlockMsg();
BlockHeaderMsg headerMsg = new BlockHeaderMsg();
newBlockMsg.Header = headerMsg;
headerMsg.Height = lastBlockHeight + 1;
headerMsg.PreviousBlockHash = lastBlockHash;
long totalAmount = 0;
long totalFee = 0;
foreach (var tx in transactionMsgs)
{
long totalInputsAmount = 0L;
long totalOutputAmount = 0L;
foreach (var input in tx.Inputs)
{
var utxo = outputDac.SelectByHashAndIndex(input.OutputTransactionHash, input.OutputIndex);
if (utxo != null)
{
totalInputsAmount += utxo.Amount;
}
}
foreach (var output in tx.Outputs)
{
totalOutputAmount += output.Amount;
}
totalAmount += totalOutputAmount;
totalFee += (totalInputsAmount - totalOutputAmount);
}
var work = new POW(headerMsg.Height);
BlockMsg previous4032Block = null;
if (headerMsg.Height > POW.DiffiucltyAdjustStep)
{
previous4032Block = this.GetBlockMsgByHeight(headerMsg.Height - POW.DiffiucltyAdjustStep);
}
var newBlockReward = work.GetNewBlockReward();
headerMsg.Bits = work.CalculateNextWorkTarget(lastBlockHeight, lastBlockBits, previous4032Block);
headerMsg.TotalTransaction = transactionMsgs.Count + 1;
var coinbaseTxMsg = new TransactionMsg();
coinbaseTxMsg.Timestamp = Time.EpochTime;
coinbaseTxMsg.Locktime = 0;
var coinbaseInputMsg = new InputMsg();
coinbaseTxMsg.Inputs.Add(coinbaseInputMsg);
coinbaseInputMsg.OutputIndex = 0;
coinbaseInputMsg.OutputTransactionHash = Base16.Encode(HashHelper.EmptyHash());
coinbaseInputMsg.UnlockScript = Script.BuildMinerScript(minerName);
coinbaseInputMsg.Size = coinbaseInputMsg.UnlockScript.Length;
var coinbaseOutputMsg = new OutputMsg();
coinbaseTxMsg.Outputs.Add(coinbaseOutputMsg);
coinbaseOutputMsg.Amount = newBlockReward + totalFee;
coinbaseOutputMsg.LockScript = Script.BuildLockScipt(minerAccount.Id);
coinbaseOutputMsg.Size = coinbaseOutputMsg.LockScript.Length;
coinbaseOutputMsg.Index = 0;
coinbaseTxMsg.Hash = coinbaseTxMsg.GetHash();
newBlockMsg.Transactions.Insert(0, coinbaseTxMsg);
foreach (var tx in transactionMsgs)
{
newBlockMsg.Transactions.Add(tx);
}
return(newBlockMsg);
}
public bool VerifyBlock(BlockMsg newBlock)
{
if (this.exists(newBlock.Header.Hash))
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_HAS_BEEN_EXISTED);
}
if (newBlock.Header.Hash != newBlock.Header.GetHash())
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_HASH_ERROR);
}
var blockComponent = new BlockComponent();
var previousBlock = this.GetBlockMsgByHash(newBlock.Header.PreviousBlockHash);
if (newBlock.Header.Height > 0 && previousBlock == null)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.PREV_BLOCK_NOT_EXISTED);
}
if ((newBlock.Header.Timestamp > Time.EpochTime && (newBlock.Header.Timestamp - Time.EpochTime) > 2 * 60 * 60 * 1000) ||
(previousBlock != null && newBlock.Header.Timestamp <= previousBlock.Header.Timestamp))
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_TIME_IS_ERROR);
}
if (newBlock.Serialize().Length > BlockSetting.MAX_BLOCK_SIZE)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_SIZE_LARGE_THAN_LIMIT);
}
var work = new POW(newBlock.Header.Height);
var txComponent = new TransactionComponent();
if (newBlock.Transactions.Count > 0)
{
var coinbase = newBlock.Transactions[0];
var reward = work.GetNewBlockReward();
var totalFee = 0L;
if (newBlock.Transactions.Count > 1)
{
for (int i = 1; i < newBlock.Transactions.Count; i++)
{
long fee;
if (txComponent.VerifyTransaction(newBlock.Transactions[i], out fee))
{
totalFee += fee;
}
else
{
return(false);
}
}
}
if (coinbase.Inputs.Count != 1 || coinbase.Outputs.Count != 1 || coinbase.Inputs[0].OutputTransactionHash != Base16.Encode(HashHelper.EmptyHash()))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.COINBASE_FORMAT_ERROR);
}
else
{
var output = coinbase.Outputs[0];
if (output.Amount > BlockSetting.OUTPUT_AMOUNT_MAX)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.OUTPUT_EXCEEDED_THE_LIMIT);
}
if (!Script.VerifyLockScriptFormat(output.LockScript))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.SCRIPT_FORMAT_ERROR);
}
if (output.Amount != (totalFee + reward))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.COINBASE_OUTPUT_AMOUNT_ERROR);
}
}
}
var prev4032Block = this.GetBlockMsgByHeight(newBlock.Header.Height - POW.DiffiucltyAdjustStep);
long previousBlockHeight = -1;
long previousBlockBits = -1;
if (previousBlock != null)
{
previousBlockHeight = previousBlock.Header.Height;
previousBlockBits = previousBlock.Header.Bits;
}
if (work.CalculateNextWorkTarget(previousBlockHeight, previousBlockBits, prev4032Block) != newBlock.Header.Bits)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BITS_IS_WRONG);
}
var hashResult = this.GetMiningWorkResult(newBlock);
if (work.Verify(newBlock.Header.Bits, hashResult))
{
return(true);
}
else
{
throw new CommonException(ErrorCode.Engine.Block.Verify.POW_VERIFY_FAIL);
}
}