src/primitives/transaction.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2015 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #include "primitives/transaction.h"
   7
   8 #include "hash.h"
   9 #include "tinyformat.h"
  10 #include "utilstrencodings.h"
  11
  12 std::string COutPoint::ToString() const
  13 {
  14     return strprintf("COutPoint(%s, %u)", hash.ToString().substr(0,10), n);
  15 }
  16
  17 CTxIn::CTxIn(COutPoint prevoutIn, CScript scriptSigIn, uint32_t nSequenceIn)
  18 {
  19     prevout = prevoutIn;
  20     scriptSig = scriptSigIn;
  21     nSequence = nSequenceIn;
  22 }
  23
  24 CTxIn::CTxIn(uint256 hashPrevTx, uint32_t nOut, CScript scriptSigIn, uint32_t nSequenceIn)
  25 {
  26     prevout = COutPoint(hashPrevTx, nOut);
  27     scriptSig = scriptSigIn;
  28     nSequence = nSequenceIn;
  29 }
  30
  31 std::string CTxIn::ToString() const
  32 {
  33     std::string str;
  34     str += "CTxIn(";
  35     str += prevout.ToString();
  36     if (prevout.IsNull())
  37         str += strprintf(", coinbase %s", HexStr(scriptSig));
  38     else
  39         str += strprintf(", scriptSig=%s", HexStr(scriptSig).substr(0, 24));
  40     if (nSequence != SEQUENCE_FINAL)
  41         str += strprintf(", nSequence=%u", nSequence);
  42     str += ")";
  43     return str;
  44 }
  45
  46 CTxOut::CTxOut(const CAmount& nValueIn, CScript scriptPubKeyIn)
  47 {
  48     nValue = nValueIn;
  49     scriptPubKey = scriptPubKeyIn;
  50 }
  51
  52 std::string CTxOut::ToString() const
  53 {
  54     return strprintf("CTxOut(nValue=%d.%08d, scriptPubKey=%s)", nValue / COIN, nValue % COIN, HexStr(scriptPubKey).substr(0, 30));
  55 }
  56
  57 CMutableTransaction::CMutableTransaction() : nVersion(CTransaction::CURRENT_VERSION), nLockTime(0) {}
  58 CMutableTransaction::CMutableTransaction(const CTransaction& tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), wit(tx.wit), nLockTime(tx.nLockTime) {}
  59
  60 uint256 CMutableTransaction::GetHash() const
  61 {
  62     return SerializeHash(*this, SER_GETHASH, SERIALIZE_TRANSACTION_NO_WITNESS);
  63 }
  64
  65 void CTransaction::UpdateHash() const
  66 {
  67     *const_cast<uint256*>(&hash) = SerializeHash(*this, SER_GETHASH, SERIALIZE_TRANSACTION_NO_WITNESS);
  68 }
  69
  70 uint256 CTransaction::GetWitnessHash() const
  71 {
  72     return SerializeHash(*this, SER_GETHASH, 0);
  73 }
  74
  75 CTransaction::CTransaction() : nVersion(CTransaction::CURRENT_VERSION), vin(), vout(), nLockTime(0) { }
  76
  77 CTransaction::CTransaction(const CMutableTransaction &tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), wit(tx.wit), nLockTime(tx.nLockTime) {
  78     UpdateHash();
  79 }
  80
  81 CTransaction::CTransaction(CMutableTransaction &&tx) : nVersion(tx.nVersion), vin(std::move(tx.vin)), vout(std::move(tx.vout)), wit(std::move(tx.wit)), nLockTime(tx.nLockTime) {
  82     UpdateHash();
  83 }
  84
  85 CTransaction& CTransaction::operator=(const CTransaction &tx) {
  86     *const_cast<int*>(&nVersion) = tx.nVersion;
  87     *const_cast<std::vector<CTxIn>*>(&vin) = tx.vin;
  88     *const_cast<std::vector<CTxOut>*>(&vout) = tx.vout;
  89     *const_cast<CTxWitness*>(&wit) = tx.wit;
  90     *const_cast<unsigned int*>(&nLockTime) = tx.nLockTime;
  91     *const_cast<uint256*>(&hash) = tx.hash;
  92     return *this;
  93 }
  94
  95 CAmount CTransaction::GetValueOut() const
  96 {
  97     CAmount nValueOut = 0;
  98     for (std::vector<CTxOut>::const_iterator it(vout.begin()); it != vout.end(); ++it)
  99     {
 100         nValueOut += it->nValue;
 101         if (!MoneyRange(it->nValue) || !MoneyRange(nValueOut))
 102             throw std::runtime_error(std::string(__func__) + ": value out of range");
 103     }
 104     return nValueOut;
 105 }
 106
 107 double CTransaction::ComputePriority(double dPriorityInputs, unsigned int nTxSize) const
 108 {
 109     nTxSize = CalculateModifiedSize(nTxSize);
 110     if (nTxSize == 0) return 0.0;
 111
 112     return dPriorityInputs / nTxSize;
 113 }
 114
 115 unsigned int CTransaction::CalculateModifiedSize(unsigned int nTxSize) const
 116 {
 117     // In order to avoid disincentivizing cleaning up the UTXO set we don't count
 118     // the constant overhead for each txin and up to 110 bytes of scriptSig (which
 119     // is enough to cover a compressed pubkey p2sh redemption) for priority.
 120     // Providing any more cleanup incentive than making additional inputs free would
 121     // risk encouraging people to create junk outputs to redeem later.
 122     if (nTxSize == 0)
 123         nTxSize = (GetTransactionWeight(*this) + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR;
 124     for (std::vector<CTxIn>::const_iterator it(vin.begin()); it != vin.end(); ++it)
 125     {
 126         unsigned int offset = 41U + std::min(110U, (unsigned int)it->scriptSig.size());
 127         if (nTxSize > offset)
 128             nTxSize -= offset;
 129     }
 130     return nTxSize;
 131 }
 132
 133 unsigned int CTransaction::GetTotalSize() const
 134 {
 135     return ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION);
 136 }
 137
 138 std::string CTransaction::ToString() const
 139 {
 140     std::string str;
 141     str += strprintf("CTransaction(hash=%s, ver=%d, vin.size=%u, vout.size=%u, nLockTime=%u)\n",
 142         GetHash().ToString().substr(0,10),
 143         nVersion,
 144         vin.size(),
 145         vout.size(),
 146         nLockTime);
 147     for (unsigned int i = 0; i < vin.size(); i++)
 148         str += "    " + vin[i].ToString() + "\n";
 149     for (unsigned int i = 0; i < wit.vtxinwit.size(); i++)
 150         str += "    " + wit.vtxinwit[i].scriptWitness.ToString() + "\n";
 151     for (unsigned int i = 0; i < vout.size(); i++)
 152         str += "    " + vout[i].ToString() + "\n";
 153     return str;
 154 }
 155
 156 int64_t GetTransactionWeight(const CTransaction& tx)
 157 {
 158     return ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR -1) + ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
 159 }