-\feffusing System;
+\feff/**
+ * Novacoin classes library
+ * Copyright (C) 2015 Alex D. (balthazar.ad@gmail.com)
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using System;
+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.
- /// </summary>
- public class CTransaction
- {
- /// <summary>
- /// Version of transaction schema.
- /// </summary>
- public uint nVersion = 1;
-
- /// <summary>
- /// Transaction timestamp.
- /// </summary>
- public uint nTime = 0;
-
- /// <summary>
- /// Array of transaction inputs
- /// </summary>
- public CTxIn[] inputs;
-
- /// <summary>
- /// Array of transaction outputs
- /// </summary>
- public CTxOut[] outputs;
-
- /// <summary>
- /// Block height or timestamp when transaction is final
- /// </summary>
- public uint nLockTime = 0;
-
- public CTransaction ()
- {
-
- }
- }
-}
+ [Serializable]
+ public class TransactionConstructorException : Exception
+ {
+ public TransactionConstructorException()
+ {
+ }
+
+ public TransactionConstructorException(string message)
+ : base(message)
+ {
+ }
+
+ public TransactionConstructorException(string message, Exception inner)
+ : base(message, inner)
+ {
+ }
+ }
+
+ /// <summary>
+ /// 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;
+
+ /// <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>
+ public uint nVersion;
+
+ /// <summary>
+ /// Transaction timestamp.
+ /// </summary>
+ public uint nTime;
+
+ /// <summary>
+ /// Array of transaction inputs
+ /// </summary>
+ public CTxIn[] vin;
+
+ /// <summary>
+ /// Array of transaction outputs
+ /// </summary>
+ public CTxOut[] vout;
+
+ /// <summary>
+ /// Block height or timestamp when transaction is final
+ /// </summary>
+ public uint nLockTime;
+
+ /// <summary>
+ /// Initialize an empty instance
+ /// </summary>
+ public CTransaction()
+ {
+ // Initialize empty input and output arrays. Please note that such
+ // configuration is not valid for real transaction, you have to supply
+ // at least one input and one output.
+ nVersion = 1;
+ nTime = 0;
+ vin = new CTxIn[0];
+ vout = new CTxOut[0];
+ nLockTime = 0;
+ }
+
+ /// <summary>
+ /// Initialize new instance as a copy of another transaction
+ /// </summary>
+ /// <param name="tx">Transaction to copy from</param>
+ public CTransaction(CTransaction tx)
+ {
+ nVersion = tx.nVersion;
+ nTime = tx.nTime;
+
+ vin = new CTxIn[tx.vin.Length];
+
+ for (int i = 0; i < vin.Length; i++)
+ {
+ vin[i] = new CTxIn(tx.vin[i]);
+ }
+
+ vout = new CTxOut[tx.vout.Length];
+
+ for (int i = 0; i < vout.Length; i++)
+ {
+ vout[i] = new CTxOut(tx.vout[i]);
+ }
+
+ nLockTime = tx.nLockTime;
+ }
+
+ /// <summary>
+ /// Attempts to execute all transaction scripts and validate the results.
+ /// </summary>
+ /// <returns>Checking result.</returns>
+ public bool VerifyScripts()
+ {
+ if (IsCoinBase)
+ {
+ return true;
+ }
+
+ TxOutItem txOutCursor = null;
+ for (int i = 0; i < vin.Length; i++)
+ {
+ var outpoint = vin[i].prevout;
+
+ if (!CBlockStore.Instance.GetTxOutCursor(outpoint, ref txOutCursor))
+ return false;
+
+ if (!ScriptCode.VerifyScript(vin[i].scriptSig, txOutCursor.scriptPubKey, this, i, (int)scriptflag.SCRIPT_VERIFY_P2SH, 0))
+ return false;
+ }
+
+ return true;
+ }
+
+ /// <summary>
+ /// Calculate amount of signature operations without trying to properly evaluate P2SH scripts.
+ /// </summary>
+ public uint LegacySigOpCount
+ {
+ get
+ {
+ uint nSigOps = 0;
+ foreach (var txin in vin)
+ {
+ nSigOps += txin.scriptSig.GetSigOpCount(false);
+ }
+ foreach (var txout in vout)
+ {
+ nSigOps += txout.scriptPubKey.GetSigOpCount(false);
+ }
+
+ return nSigOps;
+ }
+ }
+
+ /// <summary>
+ /// Basic sanity checkings
+ /// </summary>
+ /// <returns>Checking result</returns>
+ public bool CheckTransaction()
+ {
+ if (Size > nMaxTxSize || vin.Length == 0 || vout.Length == 0)
+ {
+ return false;
+ }
+
+ // Check for empty or overflow output values
+ ulong nValueOut = 0;
+ for (int i = 0; i < vout.Length; i++)
+ {
+ CTxOut txout = vout[i];
+ if (txout.IsEmpty && !IsCoinBase && !IsCoinStake)
+ {
+ // Empty outputs aren't allowed for user transactions.
+ return false;
+ }
+
+ nValueOut += txout.nValue;
+ if (!MoneyRange(nValueOut))
+ {
+ return false;
+ }
+ }
+
+ // Check for duplicate inputs
+ var InOutPoints = new List<COutPoint>();
+ foreach (var txin in vin)
+ {
+ if (InOutPoints.IndexOf(txin.prevout) != -1)
+ {
+ // Duplicate input.
+ return false;
+ }
+ InOutPoints.Add(txin.prevout);
+ }
+
+ if (IsCoinBase)
+ {
+ if (vin[0].scriptSig.Size < 2 || vin[0].scriptSig.Size > 100)
+ {
+ // Script size is invalid
+ return false;
+ }
+ }
+ else
+ {
+ foreach (var txin in vin)
+ {
+ if (txin.prevout.IsNull)
+ {
+ // Null input in non-coinbase transaction.
+ return false;
+ }
+ }
+ }
+
+ return true;
+ }
+
+ public bool IsFinal(uint nBlockHeight = 0, uint nBlockTime = 0)
+ {
+ // Time based nLockTime
+ if (nLockTime == 0)
+ {
+ return true;
+ }
+ if (nBlockHeight == 0)
+ {
+ nBlockHeight = uint.MaxValue; // TODO: stupid stub here, should be best height instead.
+ }
+ if (nBlockTime == 0)
+ {
+ nBlockTime = NetInfo.GetAdjustedTime();
+ }
+ if (nLockTime < (nLockTime < NetInfo.nLockTimeThreshold ? nBlockHeight : nBlockTime))
+ {
+ return true;
+ }
+ foreach (var txin in vin)
+ {
+ if (!txin.IsFinal)
+ {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /// <summary>
+ /// Parse byte sequence and initialize new instance of CTransaction
+ /// </summary>
+ /// <param name="txBytes">Byte sequence</param>
+ public CTransaction(byte[] txBytes)
+ {
+ try
+ {
+ var stream = new MemoryStream(txBytes);
+ var reader = new BinaryReader(stream);
+
+ nVersion = reader.ReadUInt32();
+ nTime = reader.ReadUInt32();
+
+ 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(reader.ReadBytes(36));
+
+ int nScriptSigLen = (int)VarInt.ReadVarInt(ref reader);
+ vin[nCurrentInput].scriptSig = new CScript(reader.ReadBytes(nScriptSigLen));
+
+ vin[nCurrentInput].nSequence = reader.ReadUInt32();
+ }
+
+ 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 = reader.ReadUInt64();
+
+ int nScriptPKLen = (int)VarInt.ReadVarInt(ref reader);
+ vout[nCurrentOutput].scriptPubKey = new CScript(reader.ReadBytes(nScriptPKLen));
+ }
+
+ nLockTime = reader.ReadUInt32();
+ }
+ catch (Exception e)
+ {
+ throw new TransactionConstructorException("Deserialization failed", e);
+ }
+ }
+
+ /// <summary>
+ /// Serialized size
+ /// </summary>
+ public int Size
+ {
+ get
+ {
+ int nSize = 12; // nVersion, nTime, nLockLime
+
+ nSize += VarInt.GetEncodedSize(vin.Length);
+ nSize += VarInt.GetEncodedSize(vout.Length);
+
+ foreach (var input in vin)
+ {
+ nSize += input.Size;
+ }
+
+ foreach (var output in vout)
+ {
+ nSize += output.Size;
+ }
+
+ return nSize;
+ }
+ }
+
+ /// <summary>
+ /// Read transactions array which is encoded in the block body.
+ /// </summary>
+ /// <param name="wTxBytes">Bytes sequence</param>
+ /// <returns>Transactions array</returns>
+ internal static CTransaction[] ReadTransactionsList(ref BinaryReader reader)
+ {
+ try
+ {
+ // Read amount of transactions
+ 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 = reader.ReadUInt32();
+ tx[nTx].nTime = reader.ReadUInt32();
+
+ // Inputs array
+ tx[nTx].vin = CTxIn.ReadTxInList(ref reader);
+
+ // outputs array
+ tx[nTx].vout = CTxOut.ReadTxOutList(ref reader);
+
+ tx[nTx].nLockTime = reader.ReadUInt32();
+ }
+
+ return tx;
+
+ }
+ catch (Exception e)
+ {
+ throw new TransactionConstructorException("Deserialization failed", e);
+ }
+ }
+
+ public bool IsCoinBase
+ {
+ get { return (vin.Length == 1 && vin[0].prevout.IsNull && vout.Length >= 1); }
+ }
+
+ public bool IsCoinStake
+ {
+ get
+ {
+ return (vin.Length > 0 && (!vin[0].prevout.IsNull) && vout.Length >= 2 && vout[0].IsEmpty);
+ }
+ }
+
+ /// <summary>
+ /// Transaction hash
+ /// </summary>
+ public uint256 Hash
+ {
+ get { return CryptoUtils.ComputeHash256(this); }
+ }
+
+ /// <summary>
+ /// Amount of novacoins spent by this transaction.
+ /// </summary>
+ public ulong nValueOut
+ {
+ get
+ {
+ ulong nValueOut = 0;
+ foreach (var txout in vout)
+ {
+ nValueOut += txout.nValue;
+ Contract.Assert(MoneyRange(txout.nValue) && MoneyRange(nValueOut));
+ }
+ return nValueOut;
+ }
+ }
+
+ /// <summary>
+ /// A sequence of bytes, which corresponds to the current state of CTransaction.
+ /// </summary>
+ public static implicit operator byte[] (CTransaction tx)
+ {
+ var stream = new MemoryStream();
+ var writer = new BinaryWriter(stream);
+
+ writer.Write(tx.nVersion);
+ writer.Write(tx.nTime);
+ writer.Write(VarInt.EncodeVarInt(tx.vin.LongLength));
+
+ foreach (var input in tx.vin)
+ {
+ writer.Write(input);
+ }
+
+ writer.Write(VarInt.EncodeVarInt(tx.vout.LongLength));
+
+ foreach (var output in tx.vout)
+ {
+ writer.Write(output);
+ }
+
+ writer.Write(tx.nLockTime);
+ var resultBytes = stream.ToArray();
+ writer.Close();
+
+ return resultBytes;
+ }
+
+ public override string ToString()
+ {
+ var sb = new StringBuilder();
+
+ sb.AppendFormat("CTransaction(\n nVersion={0},\n nTime={1},\n", nVersion, nTime);
+
+ foreach (var txin in vin)
+ {
+ sb.AppendFormat(" {0},\n", txin);
+ }
+
+ foreach (var txout in vout)
+ {
+ sb.AppendFormat(" {0},\n", txout);
+ }
+
+ sb.AppendFormat("\nnLockTime={0}\n)", nLockTime);
+
+ return sb.ToString();
+ }
+
+ 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);
+ }
+
+ internal bool GetCoinAge(ref Dictionary<COutPoint, TxOutItem> inputs, out ulong nCoinAge)
+ {
+ throw new NotImplementedException();
+ }
+
+ internal static ulong GetMinFee(int v1, bool v2, MinFeeMode gMF_BLOCK, int nTxSize)
+ {
+ throw new NotImplementedException();
+ }
+ }
+}
git://git.novaco.in / NovacoinLibrary.git / blobdiff