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 txComponent = new TransactionComponent();
var newBlockReward = POC.GetNewBlockReward(newBlock.Header.Height);
var prevStepBlock = GetBlockMsgByHeight(newBlock.Header.Height - POC.DIFFIUCLTY_ADJUST_STEP - 1);
var minerInfo = string.Empty;
if (newBlock.Transactions.Count > 0)
{
var coinbase = newBlock.Transactions[0];
var totalFee = 0L;
minerInfo = Encoding.UTF8.GetString(Base16.Decode(coinbase.Inputs[0].UnlockScript)).Split("`")[0];
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 + newBlockReward))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.COINBASE_OUTPUT_AMOUNT_ERROR);
}
}
}
var pool = new MiningPoolComponent().GetMiningPoolByName(minerInfo);
if (pool == null)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.MINING_POOL_NOT_EXISTED);
}
if (!POC.VerifyBlockSignature(newBlock.Header.PayloadHash, newBlock.Header.BlockSignature, pool.PublicKey))
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_SIGNATURE_IS_ERROR);
}
long previousBlockHeight = -1;
long previousBlockBits = -1;
if (previousBlock != null)
{
previousBlockHeight = previousBlock.Header.Height;
previousBlockBits = previousBlock.Header.Bits;
}
if (POC.CalculateBaseTarget(newBlock.Header.Height, previousBlock, prevStepBlock) != newBlock.Header.Bits)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BITS_IS_WRONG);
}
var targetResult = POC.CalculateTargetResult(newBlock);
if (POC.Verify(newBlock.Header.Bits, targetResult))
{
return(true);
}
else
{
throw new CommonException(ErrorCode.Engine.Block.Verify.POC_VERIFY_FAIL);
}
}
public void ProcessUncsonfirmedBlocks()
{
var blockDac = new BlockDac();
var txDac = new TransactionDac();
var txComponent = new TransactionComponent();
var utxoComponent = new UtxoComponent();
long lastHeight = this.GetLatestHeight();
long confirmedHeight = -1;
var confirmedBlock = blockDac.SelectLastConfirmed();
var confirmedHash = Base16.Encode(HashHelper.EmptyHash());
if (confirmedBlock != null)
{
confirmedHeight = confirmedBlock.Height;
confirmedHash = confirmedBlock.Hash;
}
if (lastHeight - confirmedHeight >= 6)
{
var blocks = blockDac.SelectByPreviousHash(confirmedHash);
if (blocks.Count == 1)
{
blockDac.UpdateBlockStatusToConfirmed(blocks[0].Hash);
this.ProcessUncsonfirmedBlocks();
}
else if (blocks.Count > 1)
{
var countOfDescendants = new Dictionary <string, long>();
foreach (var block in blocks)
{
var count = blockDac.CountOfDescendants(block.Hash);
if (!countOfDescendants.ContainsKey(block.Hash))
{
countOfDescendants.Add(block.Hash, count);
}
}
var dicSort = countOfDescendants.OrderBy(d => d.Value).ToList();
var lastItem = blocks.Where(b => b.Hash == dicSort[dicSort.Count - 1].Key).First();
var index = 0;
while (index < dicSort.Count - 1)
{
var currentItem = blocks.Where(b => b.Hash == dicSort[index].Key).First();
if (lastHeight - currentItem.Height >= 6)
{
var txList = txDac.SelectByBlockHash(currentItem.Hash);
//Skip coinbase tx
for (int i = 1; i < txList.Count; i++)
{
var tx = txList[i];
var txMsg = txComponent.ConvertTxEntityToMsg(tx);
txComponent.AddTransactionToPool(txMsg);
}
//remove coinbase from utxo
UtxoSet.Instance.RemoveUtxoRecord(txList[0].Hash, 0);
blockDac.UpdateBlockStatusToDiscarded(currentItem.Hash);
index++;
}
else
{
break;
}
}
if (dicSort.Count - index <= 1)
{
blockDac.UpdateBlockStatusToConfirmed(lastItem.Hash);
this.ProcessUncsonfirmedBlocks();
}
}
}
}
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);
}
}
