//Compares this UTXO to the one specified by {@code other}, considering them equal if they have
// {@code txHash} arrays with equal contents and equal {@code index} values
public override bool Equals(Object other)
{
if (other == null)
{
return(false);
}
UTXO otherUtxo = (UTXO)other;
// 直接对比hash是否一致
if (this.utoxHashCode() != otherUtxo.utoxHashCode())
{
return(false);
}
else
{
return(true);
}
}
public string handleTxs(Transaction tx)
{
try
{
string sRet = ConstHelper.BC_OK;
if (isValidTx(tx))
{
//add unspent coin
for (uint i = 0; i < tx.numOutputs(); ++i)
{
UTXO utxo = new UTXO(tx.getHash(), i);
UnCommitedUtxoPool.addUTXO(utxo, tx.getOutput((int)i));
LogHelper.WriteInfoLog(string.Format("Add utxo to uncommited pool, utxoHash:{0}", utxo.utoxHashCode()));
}
//delete spent coin
for (int i = 0; i < tx.numInputs(); ++i)
{
Input input = tx.getInput(i);
UTXO utxo = new UTXO(input.PreTxHash, (uint)input.OutputIndex);
CommitedUtxoPool.removeUTXO(utxo);
LogHelper.WriteInfoLog(string.Format("Remove utxo from commited pool, utxoHash:{0}", utxo.utoxHashCode()));
}
}
else
{
sRet = "invalid transaction";
}
LogHelper.WriteInfoLog("handleTxs result:" + sRet);
return(sRet);
}
catch (Exception ex)
{
LogHelper.WriteErrorLog(ex.Message);
return("HandleTxs catch an exception ");
}
}
/**
* @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);
}