/// <summary>
/// 根据block信息更新UTXO pool，同时返回该block生成的utxo list，用来提示该block收到了多少钱
/// </summary>
/// <param name="block"></param>
/// <returns>just for update key corresponding value</returns>
public UTXOPool BlockData2UTXOPool(bool bCommitedPool, Block block)
{
LogHelper.WriteMethodLog(true);
LogHelper.WriteInfoLog("bCommitedPool: " + bCommitedPool.ToString());
UTXOPool utxopoll = new UTXOPool();
if (bCommitedPool)
{
utxopoll = this.CommitedUtxoPool;
}
else
{
utxopoll = this.UnCommitedUtxoPool;
}
UTXOPool sigleBlockPool = new UTXOPool();
foreach (Transaction eTransaction in block.listTransactions)
{
foreach (Input eInput in eTransaction.listInputs)
{
UTXO utxo = this.input2UTXO(eInput);
if (utxopoll.contains(utxo))
{
utxopoll.removeUTXO(utxo);
}
else
{
// 初始化时由于leveldb 树形结构第一个可能创世块，所以先记下来在后面再remove
if (utxo.getTxHash() != ConstHelper.BC_BaseCoinInputTxHash)
{
tempUTXOList.Add(utxo);
}
}
}
for (int i = 0; i < eTransaction.listOutputs.Count; i++)
{
// hash is transaction hash
UTXO utxo1 = new UTXO(eTransaction.getHash(), (uint)i);
utxopoll.addUTXO(utxo1, eTransaction.listOutputs[i]);
sigleBlockPool.addUTXO(utxo1, eTransaction.listOutputs[i]);
}
}
LogHelper.WriteMethodLog(false);
return(sigleBlockPool);
}
/**
* @return true if:
* (1) all outputs claimed by {@code tx} are in the current UTXO pool,
* (2) the signatures on each input of {@code tx} are valid,
* (3) no UTXO is claimed multiple times by {@code tx},
* (4) all of {@code tx}s output values are non-negative, and
* (5) the sum of {@code tx}s input values is greater than or equal to the sum of its output
* values; and false otherwise.
*/
public bool isValidTx(Transaction tx)
{
LogHelper.WriteMethodLog(true);
if (tx.listInputs.Count == 0 || tx.listOutputs.Count == 0)
{
LogHelper.WriteInfoLog("empty input|output");
return(false);
}
// IMPLEMENT THIS
double sumOut = 0;
double sumIn = 0;
Dictionary <string, UTXO> dicUsed = new Dictionary <string, UTXO>();
for (int i = 0; i < tx.numInputs(); i++)
{
Input input = tx.getInput(i);
UTXO utxo = new UTXO(input.PreTxHash, (uint)input.OutputIndex);
if (!CommitedUtxoPool.contains(utxo))
{
LogHelper.WriteInfoLog(" utxoPool not contain utxo:");
return(false); //check (1),utox 包含该交易返回false
}
Output PreOutput = CommitedUtxoPool.getTxOutput(utxo); // the consume coin correspond prev output coin;
sumIn += PreOutput.value; //(5) 计算input 指向的pre output 的value，最后保证输入的value等于该笔交易输出的
string strOriginalTxt = tx.getRawDataToSign(i);
if (!Cryptor.VerifySignature(input.ScriptSig, PreOutput.scriptPubKey, strOriginalTxt))
{
LogHelper.WriteInfoLog(" VerifySignature fail");
return(false);//check(2)
}
bool bIsContain = dicUsed.ContainsKey(utxo.utoxHashCode());
if (!bIsContain) // UTXO不会被重复添加
{
dicUsed.Add(utxo.utoxHashCode(), utxo);
}
else
{
LogHelper.WriteInfoLog(" double spend :" + utxo.utoxHashCode());
return(false);
}
}
foreach (Output output in tx.getOutputs())
{
if (output.value < 0)
{
LogHelper.WriteInfoLog(" output.value < 0 ");
return(false);//check(5)
}
sumOut += output.value;
}
if (sumIn < sumOut)
{
LogHelper.WriteInfoLog(" sumIn < sumOut ");
return(false);//check(5);
}
LogHelper.WriteInfoLog("Valid Tx");
return(true);
}