using System.Text;
using System.Collections.Generic;
using System.IO;
+using System.Diagnostics.Contracts;
+using System.Numerics;
namespace Novacoin
{
}
/// <summary>
- /// Represents the transaction. Any transaction must provide one input and one output at least.
+ /// Represents the transaction.
/// </summary>
public class CTransaction
{
/// <summary>
+ /// One cent = 10000 satoshis.
+ /// </summary>
+ public const ulong nCent = 10000;
+
+ /// <summary>
/// One coin = 1000000 satoshis.
/// </summary>
public const ulong nCoin = 1000000;
+
/// <summary>
/// Sanity checking threshold.
/// </summary>
public const ulong nMaxMoney = 2000000000 * nCoin;
+ public const ulong nMinTxFee = nCent / 10;
+ public const ulong nMinRelayTxFee = nCent / 50;
+ public const ulong nMinTxoutAmount = nCent / 100;
+
+ /// <summary>
+ /// Maximum transaction size is 250Kb
+ /// </summary>
+ public const uint nMaxTxSize = 250000;
+
+ public enum MinFeeMode
+ {
+ GMF_BLOCK,
+ GMF_RELAY,
+ GMF_SEND,
+ }
+
/// <summary>
/// Version of transaction schema.
/// </summary>
return true;
}
- CTransaction txPrev = null;
+ TxOutItem txOutCursor = null;
for (int i = 0; i < vin.Length; i++)
{
var outpoint = vin[i].prevout;
- if (!CBlockStore.Instance.GetTransaction(outpoint.hash, ref txPrev))
+ if (!CBlockStore.Instance.GetTxOutCursor(outpoint, ref txOutCursor))
return false;
- if (!ScriptCode.VerifyScript(vin[i].scriptSig, txPrev.vout[outpoint.n].scriptPubKey, this, i, (int)scriptflag.SCRIPT_VERIFY_P2SH, 0))
+ if (!ScriptCode.VerifyScript(vin[i].scriptSig, txOutCursor.scriptPubKey, this, i, (int)scriptflag.SCRIPT_VERIFY_P2SH, 0))
return false;
}
/// <returns>Checking result</returns>
public bool CheckTransaction()
{
- if (Size > 250000 || vin.Length == 0 || vout.Length == 0)
+ if (Size > nMaxTxSize || vin.Length == 0 || vout.Length == 0)
{
return false;
}
}
if (nBlockTime == 0)
{
- nBlockTime = NetUtils.GetAdjustedTime();
+ nBlockTime = NetInfo.GetAdjustedTime();
}
- if (nLockTime < (nLockTime < NetUtils.nLockTimeThreshold ? nBlockHeight : nBlockTime))
+ if (nLockTime < (nLockTime < NetInfo.nLockTimeThreshold ? nBlockHeight : nBlockTime))
{
return true;
}
}
return true;
}
-
+
/// <summary>
/// Parse byte sequence and initialize new instance of CTransaction
/// </summary>
{
try
{
- var wBytes = new ByteQueue(ref txBytes);
+ var stream = new MemoryStream(txBytes);
+ var reader = new BinaryReader(stream);
- nVersion = BitConverter.ToUInt32(wBytes.Get(4), 0);
- nTime = BitConverter.ToUInt32(wBytes.Get(4), 0);
+ nVersion = reader.ReadUInt32();
+ nTime = reader.ReadUInt32();
- int nInputs = (int)wBytes.GetVarInt();
+ int nInputs = (int)VarInt.ReadVarInt(ref reader);
vin = new CTxIn[nInputs];
for (int nCurrentInput = 0; nCurrentInput < nInputs; nCurrentInput++)
// Fill inputs array
vin[nCurrentInput] = new CTxIn();
- vin[nCurrentInput].prevout = new COutPoint(wBytes.Get(36));
+ vin[nCurrentInput].prevout = new COutPoint(reader.ReadBytes(36));
- int nScriptSigLen = (int)wBytes.GetVarInt();
- vin[nCurrentInput].scriptSig = new CScript(wBytes.Get(nScriptSigLen));
+ int nScriptSigLen = (int)VarInt.ReadVarInt(ref reader);
+ vin[nCurrentInput].scriptSig = new CScript(reader.ReadBytes(nScriptSigLen));
- vin[nCurrentInput].nSequence = BitConverter.ToUInt32(wBytes.Get(4), 0);
+ vin[nCurrentInput].nSequence = reader.ReadUInt32();
}
- int nOutputs = (int)wBytes.GetVarInt();
+ int nOutputs = (int)VarInt.ReadVarInt(ref reader);
vout = new CTxOut[nOutputs];
for (int nCurrentOutput = 0; nCurrentOutput < nOutputs; nCurrentOutput++)
{
// Fill outputs array
vout[nCurrentOutput] = new CTxOut();
- vout[nCurrentOutput].nValue = BitConverter.ToUInt64(wBytes.Get(8), 0);
+ vout[nCurrentOutput].nValue = reader.ReadUInt64();
- int nScriptPKLen = (int)wBytes.GetVarInt();
- vout[nCurrentOutput].scriptPubKey = new CScript(wBytes.Get(nScriptPKLen));
+ int nScriptPKLen = (int)VarInt.ReadVarInt(ref reader);
+ vout[nCurrentOutput].scriptPubKey = new CScript(reader.ReadBytes(nScriptPKLen));
}
- nLockTime = BitConverter.ToUInt32(wBytes.Get(4), 0);
+ nLockTime = reader.ReadUInt32();
}
catch (Exception e)
{
/// <summary>
/// Serialized size
/// </summary>
- public int Size
+ public uint Size
{
get
{
- int nSize = 12; // nVersion, nTime, nLockLime
+ uint nSize = 12; // nVersion, nTime, nLockLime
nSize += VarInt.GetEncodedSize(vin.Length);
nSize += VarInt.GetEncodedSize(vout.Length);
/// </summary>
/// <param name="wTxBytes">Bytes sequence</param>
/// <returns>Transactions array</returns>
- public static CTransaction[] ReadTransactionsList(ref ByteQueue wTxBytes)
+ internal static CTransaction[] ReadTransactionsList(ref BinaryReader reader)
{
try
{
// Read amount of transactions
- int nTransactions = (int)wTxBytes.GetVarInt();
+ int nTransactions = (int)VarInt.ReadVarInt(ref reader);
var tx = new CTransaction[nTransactions];
for (int nTx = 0; nTx < nTransactions; nTx++)
// Fill the transactions array
tx[nTx] = new CTransaction();
- tx[nTx].nVersion = BitConverter.ToUInt32(wTxBytes.Get(4), 0);
- tx[nTx].nTime = BitConverter.ToUInt32(wTxBytes.Get(4), 0);
+ tx[nTx].nVersion = reader.ReadUInt32();
+ tx[nTx].nTime = reader.ReadUInt32();
// Inputs array
- tx[nTx].vin = CTxIn.ReadTxInList(ref wTxBytes);
+ tx[nTx].vin = CTxIn.ReadTxInList(ref reader);
// outputs array
- tx[nTx].vout = CTxOut.ReadTxOutList(ref wTxBytes);
+ tx[nTx].vout = CTxOut.ReadTxOutList(ref reader);
- tx[nTx].nLockTime = BitConverter.ToUInt32(wTxBytes.Get(4), 0);
+ tx[nTx].nLockTime = reader.ReadUInt32();
}
return tx;
/// <summary>
/// Transaction hash
/// </summary>
- public Hash256 Hash
+ public uint256 Hash
+ {
+ get { return CryptoUtils.ComputeHash256(this); }
+ }
+
+ /// <summary>
+ /// Amount of novacoins spent by this transaction.
+ /// </summary>
+ public ulong nValueOut
{
- get { return Hash256.Compute256(this); }
+ get
+ {
+ ulong nValueOut = 0;
+ foreach (var txout in vout)
+ {
+ nValueOut += txout.nValue;
+ Contract.Assert(MoneyRange(txout.nValue) && MoneyRange(nValueOut));
+ }
+ return nValueOut;
+ }
}
/// <summary>
}
writer.Write(tx.nLockTime);
-
var resultBytes = stream.ToArray();
-
writer.Close();
return resultBytes;
}
-
-
public override string ToString()
{
var sb = new StringBuilder();
foreach (var txin in vin)
{
- sb.AppendFormat(" {0},\n", txin.ToString());
+ sb.AppendFormat(" {0},\n", txin);
}
foreach (var txout in vout)
{
- sb.AppendFormat(" {0},\n", txout.ToString());
+ sb.AppendFormat(" {0},\n", txout);
}
sb.AppendFormat("\nnLockTime={0}\n)", nLockTime);
}
public static bool MoneyRange(ulong nValue) { return (nValue <= nMaxMoney); }
+
+ /// <summary>
+ /// Get total sigops.
+ /// </summary>
+ /// <param name="inputs">Inputs map.</param>
+ /// <returns>Amount of sigops.</returns>
+ public uint GetP2SHSigOpCount(ref Dictionary<COutPoint, TxOutItem> inputs)
+ {
+ if (IsCoinBase)
+ {
+ return 0;
+ }
+
+ uint nSigOps = 0;
+ for (var i = 0; i < vin.Length; i++)
+ {
+ var prevout = GetOutputFor(vin[i], ref inputs);
+ if (prevout.scriptPubKey.IsPayToScriptHash)
+ {
+ nSigOps += prevout.scriptPubKey.GetSigOpCount(vin[i].scriptSig);
+ }
+ }
+
+ return nSigOps;
+ }
+
+ /// <summary>
+ /// Get sum of inputs spent by this transaction.
+ /// </summary>
+ /// <param name="inputs">Reference to innputs map.</param>
+ /// <returns>Sum of inputs.</returns>
+ public ulong GetValueIn(ref Dictionary<COutPoint, TxOutItem> inputs)
+ {
+ if (IsCoinBase)
+ {
+ return 0;
+ }
+
+ ulong nResult = 0;
+ for (int i = 0; i < vin.Length; i++)
+ {
+ nResult += GetOutputFor(vin[i], ref inputs).nValue;
+ }
+
+ return nResult;
+ }
+
+ /// <summary>
+ /// Helper method to find output in the map.
+ /// </summary>
+ /// <param name="input">Transaction input.</param>
+ /// <param name="inputs">eference to inuts map.</param>
+ /// <returns>Parent output.</returns>
+ private CTxOut GetOutputFor(CTxIn input, ref Dictionary<COutPoint, TxOutItem> inputs)
+ {
+ if (!inputs.ContainsKey(input.prevout))
+ {
+ throw new Exception("No such input");
+ }
+
+ var outItem = inputs[input.prevout];
+
+ return new CTxOut(outItem.nValue, outItem.scriptPubKey);
+ }
+
+ /// <summary>
+ /// Calculate coin*age.
+ ///
+ /// Note, only those coins meeting minimum age requirement counts.
+ /// </summary>
+ /// <param name="inputs">Inputs set.</param>
+ /// <param name="nCoinAge">Coin age calculation result.</param>
+ /// <returns>Result</returns>
+ public bool GetCoinAge(ref Dictionary<COutPoint, TxOutItem> inputs, out ulong nCoinAge)
+ {
+ BigInteger bnCentSecond = 0; // coin age in the unit of cent-seconds
+ nCoinAge = 0;
+
+ if (IsCoinBase)
+ {
+ // Nothing spent by coinbase, coinage is always zero.
+ return true;
+ }
+
+ for( var i = 0; i<vin.Length; i++)
+ {
+ var prevout = vin[i].prevout;
+ Contract.Assert(inputs.ContainsKey(prevout));
+ var input = inputs[prevout];
+
+ CBlockStoreItem parentBlockCursor;
+ var merkleItem = CBlockStore.Instance.GetMerkleCursor(input, out parentBlockCursor);
+
+ if (merkleItem == null)
+ {
+ return false; // Unable to find merkle node
+ }
+
+ if (nTime < merkleItem.nTime)
+ {
+ return false; // Transaction timestamp violation
+ }
+
+ if (parentBlockCursor.nTime + StakeModifier.nStakeMinAge > nTime)
+ {
+ continue; // only count coins meeting min age requirement
+ }
+
+ ulong nValueIn = input.nValue;
+ bnCentSecond += new BigInteger(nValueIn) * (nTime - merkleItem.nTime) / nCent;
+ }
+
+ BigInteger bnCoinDay = bnCentSecond * nCent / nCoin / (24 * 60 * 60);
+ nCoinAge = (ulong)bnCoinDay;
+
+ return true;
+ }
+
+ public ulong GetMinFee(uint nBlockSize, bool fAllowFree, MinFeeMode mode)
+ {
+ ulong nMinTxFee = CTransaction.nMinTxFee, nMinRelayTxFee = CTransaction.nMinRelayTxFee;
+ uint nBytes = Size;
+
+ if (IsCoinStake)
+ {
+ // Enforce 0.01 as minimum fee for old approach or coinstake
+ nMinTxFee = nCent;
+ nMinRelayTxFee = nCent;
+
+ if (nTime < NetInfo.nStakeValidationSwitchTime)
+ {
+ // Enforce zero size for compatibility with old blocks.
+ nBytes = 0;
+ }
+ }
+
+ // Base fee is either nMinTxFee or nMinRelayTxFee
+ ulong nBaseFee = (mode == MinFeeMode.GMF_RELAY) ? nMinRelayTxFee : nMinTxFee;
+
+ uint nNewBlockSize = nBlockSize + nBytes;
+ ulong nMinFee = (1 + (ulong)nBytes / 1000) * nBaseFee;
+
+ if (fAllowFree)
+ {
+ if (nBlockSize == 1)
+ {
+ // Transactions under 1K are free
+ if (nBytes < 1000)
+ nMinFee = 0;
+ }
+ else
+ {
+ // Free transaction area
+ if (nNewBlockSize < 27000)
+ nMinFee = 0;
+ }
+ }
+
+ // To limit dust spam, require additional MIN_TX_FEE/MIN_RELAY_TX_FEE for
+ // each non empty output which is less than 0.01
+ //
+ // It's safe to ignore empty outputs here, because these inputs are allowed
+ // only for coinbase and coinstake transactions.
+ foreach (var txout in vout)
+ {
+ if (txout.nValue < nCent && !txout.IsEmpty)
+ {
+ nMinFee += nBaseFee;
+ }
+ }
+
+ var nMaxBlockSizeGen = CBlock.nMaxBlockSize / 2;
+
+ // Raise the price as the block approaches full
+ if (nBlockSize != 1 && nNewBlockSize >= nMaxBlockSizeGen / 2)
+ {
+ if (nNewBlockSize >= nMaxBlockSizeGen)
+ {
+ return nMaxMoney;
+ }
+
+ nMinFee *= nMaxBlockSizeGen / (nMaxBlockSizeGen - nNewBlockSize);
+ }
+
+ if (!MoneyRange(nMinFee))
+ {
+ nMinFee = nMaxMoney;
+ }
+
+ return nMinFee;
+ }
}
}
git://git.novaco.in / NovacoinLibrary.git / blobdiff