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main.h
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main.h
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// Copyright (c) 2009 Satoshi Nakamoto
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
class COutPoint;
class CInPoint;
class CDiskTxPos;
class CCoinBase;
class CTxIn;
class CTxOut;
class CTransaction;
class CBlock;
class CBlockIndex;
class CWalletTx;
class CKeyItem;
static const unsigned int MAX_SIZE = 0x02000000;
static const int64 COIN = 100000000;
static const int64 CENT = 1000000;
static const int COINBASE_MATURITY = 100;
static const CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
extern CCriticalSection cs_main;
extern map<uint256, CBlockIndex*> mapBlockIndex;
extern const uint256 hashGenesisBlock;
extern CBlockIndex* pindexGenesisBlock;
extern int nBestHeight;
extern uint256 hashBestChain;
extern CBlockIndex* pindexBest;
extern unsigned int nTransactionsUpdated;
extern string strSetDataDir;
extern int nDropMessagesTest;
// Settings
extern int fGenerateBitcoins;
extern int64 nTransactionFee;
extern CAddress addrIncoming;
string GetAppDir();
FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode="rb");
FILE* AppendBlockFile(unsigned int& nFileRet);
bool AddKey(const CKey& key);
vector<unsigned char> GenerateNewKey();
bool AddToWallet(const CWalletTx& wtxIn);
void ReacceptWalletTransactions();
void RelayWalletTransactions();
bool LoadBlockIndex(bool fAllowNew=true);
void PrintBlockTree();
bool BitcoinMiner();
bool ProcessMessages(CNode* pfrom);
bool ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv);
bool SendMessages(CNode* pto);
int64 GetBalance();
bool CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& txNew, int64& nFeeRequiredRet);
bool CommitTransactionSpent(const CWalletTx& wtxNew);
bool SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew);
class CDiskTxPos
{
public:
unsigned int nFile;
unsigned int nBlockPos;
unsigned int nTxPos;
CDiskTxPos()
{
SetNull();
}
CDiskTxPos(unsigned int nFileIn, unsigned int nBlockPosIn, unsigned int nTxPosIn)
{
nFile = nFileIn;
nBlockPos = nBlockPosIn;
nTxPos = nTxPosIn;
}
IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
void SetNull() { nFile = -1; nBlockPos = 0; nTxPos = 0; }
bool IsNull() const { return (nFile == -1); }
friend bool operator==(const CDiskTxPos& a, const CDiskTxPos& b)
{
return (a.nFile == b.nFile &&
a.nBlockPos == b.nBlockPos &&
a.nTxPos == b.nTxPos);
}
friend bool operator!=(const CDiskTxPos& a, const CDiskTxPos& b)
{
return !(a == b);
}
string ToString() const
{
if (IsNull())
return strprintf("null");
else
return strprintf("(nFile=%d, nBlockPos=%d, nTxPos=%d)", nFile, nBlockPos, nTxPos);
}
void print() const
{
printf("%s", ToString().c_str());
}
};
class CInPoint
{
public:
CTransaction* ptx;
unsigned int n;
CInPoint() { SetNull(); }
CInPoint(CTransaction* ptxIn, unsigned int nIn) { ptx = ptxIn; n = nIn; }
void SetNull() { ptx = NULL; n = -1; }
bool IsNull() const { return (ptx == NULL && n == -1); }
};
class COutPoint
{
public:
uint256 hash;
unsigned int n;
COutPoint() { SetNull(); }
COutPoint(uint256 hashIn, unsigned int nIn) { hash = hashIn; n = nIn; }
IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
void SetNull() { hash = 0; n = -1; }
bool IsNull() const { return (hash == 0 && n == -1); }
friend bool operator<(const COutPoint& a, const COutPoint& b)
{
return (a.hash < b.hash || (a.hash == b.hash && a.n < b.n));
}
friend bool operator==(const COutPoint& a, const COutPoint& b)
{
return (a.hash == b.hash && a.n == b.n);
}
friend bool operator!=(const COutPoint& a, const COutPoint& b)
{
return !(a == b);
}
string ToString() const
{
return strprintf("COutPoint(%s, %d)", hash.ToString().substr(0,6).c_str(), n);
}
void print() const
{
printf("%s\n", ToString().c_str());
}
};
//
// An input of a transaction. It contains the location of the previous
// transaction's output that it claims and a signature that matches the
// output's public key.
//
class CTxIn
{
public:
COutPoint prevout;
CScript scriptSig;
unsigned int nSequence;
CTxIn()
{
nSequence = UINT_MAX;
}
explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=UINT_MAX)
{
prevout = prevoutIn;
scriptSig = scriptSigIn;
nSequence = nSequenceIn;
}
CTxIn(uint256 hashPrevTx, unsigned int nOut, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=UINT_MAX)
{
prevout = COutPoint(hashPrevTx, nOut);
scriptSig = scriptSigIn;
nSequence = nSequenceIn;
}
IMPLEMENT_SERIALIZE
(
READWRITE(prevout);
READWRITE(scriptSig);
READWRITE(nSequence);
)
bool IsFinal() const
{
return (nSequence == UINT_MAX);
}
friend bool operator==(const CTxIn& a, const CTxIn& b)
{
return (a.prevout == b.prevout &&
a.scriptSig == b.scriptSig &&
a.nSequence == b.nSequence);
}
friend bool operator!=(const CTxIn& a, const CTxIn& b)
{
return !(a == b);
}
string ToString() const
{
string str;
str += strprintf("CTxIn(");
str += prevout.ToString();
if (prevout.IsNull())
str += strprintf(", coinbase %s", HexStr(scriptSig.begin(), scriptSig.end(), false).c_str());
else
str += strprintf(", scriptSig=%s", scriptSig.ToString().substr(0,24).c_str());
if (nSequence != UINT_MAX)
str += strprintf(", nSequence=%u", nSequence);
str += ")";
return str;
}
void print() const
{
printf("%s\n", ToString().c_str());
}
bool IsMine() const;
int64 GetDebit() const;
};
//
// An output of a transaction. It contains the public key that the next input
// must be able to sign with to claim it.
//
class CTxOut
{
public:
int64 nValue;
CScript scriptPubKey;
public:
CTxOut()
{
SetNull();
}
CTxOut(int64 nValueIn, CScript scriptPubKeyIn)
{
nValue = nValueIn;
scriptPubKey = scriptPubKeyIn;
}
IMPLEMENT_SERIALIZE
(
READWRITE(nValue);
READWRITE(scriptPubKey);
)
void SetNull()
{
nValue = -1;
scriptPubKey.clear();
}
bool IsNull()
{
return (nValue == -1);
}
uint256 GetHash() const
{
return SerializeHash(*this);
}
bool IsMine() const
{
return ::IsMine(scriptPubKey);
}
int64 GetCredit() const
{
if (IsMine())
return nValue;
return 0;
}
friend bool operator==(const CTxOut& a, const CTxOut& b)
{
return (a.nValue == b.nValue &&
a.scriptPubKey == b.scriptPubKey);
}
friend bool operator!=(const CTxOut& a, const CTxOut& b)
{
return !(a == b);
}
string ToString() const
{
if (scriptPubKey.size() < 6)
return "CTxOut(error)";
return strprintf("CTxOut(nValue=%I64d.%08I64d, scriptPubKey=%s)", nValue / COIN, nValue % COIN, scriptPubKey.ToString().substr(0,24).c_str());
}
void print() const
{
printf("%s\n", ToString().c_str());
}
};
//
// The basic transaction that is broadcasted on the network and contained in
// blocks. A transaction can contain multiple inputs and outputs.
//
class CTransaction
{
public:
int nVersion;
vector<CTxIn> vin;
vector<CTxOut> vout;
int nLockTime;
CTransaction()
{
SetNull();
}
IMPLEMENT_SERIALIZE
(
READWRITE(this->nVersion);
nVersion = this->nVersion;
READWRITE(vin);
READWRITE(vout);
READWRITE(nLockTime);
)
void SetNull()
{
nVersion = 1;
vin.clear();
vout.clear();
nLockTime = 0;
}
bool IsNull() const
{
return (vin.empty() && vout.empty());
}
uint256 GetHash() const
{
return SerializeHash(*this);
}
bool IsFinal() const
{
if (nLockTime == 0 || nLockTime < nBestHeight)
return true;
foreach(const CTxIn& txin, vin)
if (!txin.IsFinal())
return false;
return true;
}
bool IsNewerThan(const CTransaction& old) const
{
if (vin.size() != old.vin.size())
return false;
for (int i = 0; i < vin.size(); i++)
if (vin[i].prevout != old.vin[i].prevout)
return false;
bool fNewer = false;
unsigned int nLowest = UINT_MAX;
for (int i = 0; i < vin.size(); i++)
{
if (vin[i].nSequence != old.vin[i].nSequence)
{
if (vin[i].nSequence <= nLowest)
{
fNewer = false;
nLowest = vin[i].nSequence;
}
if (old.vin[i].nSequence < nLowest)
{
fNewer = true;
nLowest = old.vin[i].nSequence;
}
}
}
return fNewer;
}
bool IsCoinBase() const
{
return (vin.size() == 1 && vin[0].prevout.IsNull());
}
bool CheckTransaction() const
{
// Basic checks that don't depend on any context
if (vin.empty() || vout.empty())
return error("CTransaction::CheckTransaction() : vin or vout empty");
// Check for negative values
foreach(const CTxOut& txout, vout)
if (txout.nValue < 0)
return error("CTransaction::CheckTransaction() : txout.nValue negative");
if (IsCoinBase())
{
if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
return error("CTransaction::CheckTransaction() : coinbase script size");
}
else
{
foreach(const CTxIn& txin, vin)
if (txin.prevout.IsNull())
return error("CTransaction::CheckTransaction() : prevout is null");
}
return true;
}
bool IsMine() const
{
foreach(const CTxOut& txout, vout)
if (txout.IsMine())
return true;
return false;
}
int64 GetDebit() const
{
int64 nDebit = 0;
foreach(const CTxIn& txin, vin)
nDebit += txin.GetDebit();
return nDebit;
}
int64 GetCredit() const
{
int64 nCredit = 0;
foreach(const CTxOut& txout, vout)
nCredit += txout.GetCredit();
return nCredit;
}
int64 GetValueOut() const
{
int64 nValueOut = 0;
foreach(const CTxOut& txout, vout)
{
if (txout.nValue < 0)
throw runtime_error("CTransaction::GetValueOut() : negative value");
nValueOut += txout.nValue;
}
return nValueOut;
}
int64 GetMinFee(bool fDiscount=false) const
{
unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK);
if (fDiscount && nBytes < 10000)
return 0;
return (1 + (int64)nBytes / 1000) * CENT;
}
bool ReadFromDisk(CDiskTxPos pos, FILE** pfileRet=NULL)
{
CAutoFile filein = OpenBlockFile(pos.nFile, 0, pfileRet ? "rb+" : "rb");
if (!filein)
return error("CTransaction::ReadFromDisk() : OpenBlockFile failed");
// Read transaction
if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
return error("CTransaction::ReadFromDisk() : fseek failed");
filein >> *this;
// Return file pointer
if (pfileRet)
{
if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
return error("CTransaction::ReadFromDisk() : second fseek failed");
*pfileRet = filein.release();
}
return true;
}
friend bool operator==(const CTransaction& a, const CTransaction& b)
{
return (a.nVersion == b.nVersion &&
a.vin == b.vin &&
a.vout == b.vout &&
a.nLockTime == b.nLockTime);
}
friend bool operator!=(const CTransaction& a, const CTransaction& b)
{
return !(a == b);
}
string ToString() const
{
string str;
str += strprintf("CTransaction(hash=%s, ver=%d, vin.size=%d, vout.size=%d, nLockTime=%d)\n",
GetHash().ToString().substr(0,6).c_str(),
nVersion,
vin.size(),
vout.size(),
nLockTime);
for (int i = 0; i < vin.size(); i++)
str += " " + vin[i].ToString() + "\n";
for (int i = 0; i < vout.size(); i++)
str += " " + vout[i].ToString() + "\n";
return str;
}
void print() const
{
printf("%s", ToString().c_str());
}
bool DisconnectInputs(CTxDB& txdb);
bool ConnectInputs(CTxDB& txdb, map<uint256, CTxIndex>& mapTestPool, CDiskTxPos posThisTx, int nHeight, int64& nFees, bool fBlock, bool fMiner, int64 nMinFee=0);
bool ClientConnectInputs();
bool AcceptTransaction(CTxDB& txdb, bool fCheckInputs=true, bool* pfMissingInputs=NULL);
bool AcceptTransaction(bool fCheckInputs=true, bool* pfMissingInputs=NULL)
{
CTxDB txdb("r");
return AcceptTransaction(txdb, fCheckInputs, pfMissingInputs);
}
protected:
bool AddToMemoryPool();
public:
bool RemoveFromMemoryPool();
};
//
// A transaction with a merkle branch linking it to the block chain
//
class CMerkleTx : public CTransaction
{
public:
uint256 hashBlock;
vector<uint256> vMerkleBranch;
int nIndex;
// memory only
mutable bool fMerkleVerified;
CMerkleTx()
{
Init();
}
CMerkleTx(const CTransaction& txIn) : CTransaction(txIn)
{
Init();
}
void Init()
{
hashBlock = 0;
nIndex = -1;
fMerkleVerified = false;
}
int64 GetCredit() const
{
// Must wait until coinbase is safely deep enough in the chain before valuing it
if (IsCoinBase() && GetBlocksToMaturity() > 0)
return 0;
return CTransaction::GetCredit();
}
IMPLEMENT_SERIALIZE
(
nSerSize += SerReadWrite(s, *(CTransaction*)this, nType, nVersion, ser_action);
nVersion = this->nVersion;
READWRITE(hashBlock);
READWRITE(vMerkleBranch);
READWRITE(nIndex);
)
int SetMerkleBranch(const CBlock* pblock=NULL);
int GetDepthInMainChain() const;
bool IsInMainChain() const { return GetDepthInMainChain() > 0; }
int GetBlocksToMaturity() const;
bool AcceptTransaction(CTxDB& txdb, bool fCheckInputs=true);
bool AcceptTransaction() { CTxDB txdb("r"); return AcceptTransaction(txdb); }
};
//
// A transaction with a bunch of additional info that only the owner cares
// about. It includes any unrecorded transactions needed to link it back
// to the block chain.
//
class CWalletTx : public CMerkleTx
{
public:
vector<CMerkleTx> vtxPrev;
map<string, string> mapValue;
vector<pair<string, string> > vOrderForm;
unsigned int fTimeReceivedIsTxTime;
unsigned int nTimeReceived; // time received by this node
char fFromMe;
char fSpent;
//// probably need to sign the order info so know it came from payer
// memory only
mutable unsigned int nTimeDisplayed;
CWalletTx()
{
Init();
}
CWalletTx(const CMerkleTx& txIn) : CMerkleTx(txIn)
{
Init();
}
CWalletTx(const CTransaction& txIn) : CMerkleTx(txIn)
{
Init();
}
void Init()
{
fTimeReceivedIsTxTime = false;
nTimeReceived = 0;
fFromMe = false;
fSpent = false;
nTimeDisplayed = 0;
}
IMPLEMENT_SERIALIZE
(
nSerSize += SerReadWrite(s, *(CMerkleTx*)this, nType, nVersion, ser_action);
nVersion = this->nVersion;
READWRITE(vtxPrev);
READWRITE(mapValue);
READWRITE(vOrderForm);
READWRITE(fTimeReceivedIsTxTime);
READWRITE(nTimeReceived);
READWRITE(fFromMe);
READWRITE(fSpent);
)
bool WriteToDisk()
{
return CWalletDB().WriteTx(GetHash(), *this);
}
int64 GetTxTime() const;
void AddSupportingTransactions(CTxDB& txdb);
bool AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs=true);
bool AcceptWalletTransaction() { CTxDB txdb("r"); return AcceptWalletTransaction(txdb); }
void RelayWalletTransaction(CTxDB& txdb);
void RelayWalletTransaction() { CTxDB txdb("r"); RelayWalletTransaction(txdb); }
};
//
// A txdb record that contains the disk location of a transaction and the
// locations of transactions that spend its outputs. vSpent is really only
// used as a flag, but having the location is very helpful for debugging.
//
class CTxIndex
{
public:
CDiskTxPos pos;
vector<CDiskTxPos> vSpent;
CTxIndex()
{
SetNull();
}
CTxIndex(const CDiskTxPos& posIn, unsigned int nOutputs)
{
pos = posIn;
vSpent.resize(nOutputs);
}
IMPLEMENT_SERIALIZE
(
if (!(nType & SER_GETHASH))
READWRITE(nVersion);
READWRITE(pos);
READWRITE(vSpent);
)
void SetNull()
{
pos.SetNull();
vSpent.clear();
}
bool IsNull()
{
return pos.IsNull();
}
friend bool operator==(const CTxIndex& a, const CTxIndex& b)
{
if (a.pos != b.pos || a.vSpent.size() != b.vSpent.size())
return false;
for (int i = 0; i < a.vSpent.size(); i++)
if (a.vSpent[i] != b.vSpent[i])
return false;
return true;
}
friend bool operator!=(const CTxIndex& a, const CTxIndex& b)
{
return !(a == b);
}
};
//
// Nodes collect new transactions into a block, hash them into a hash tree,
// and scan through nonce values to make the block's hash satisfy proof-of-work
// requirements. When they solve the proof-of-work, they broadcast the block
// to everyone and the block is added to the block chain. The first transaction
// in the block is a special one that creates a new coin owned by the creator
// of the block.
//
// Blocks are appended to blk0001.dat files on disk. Their location on disk
// is indexed by CBlockIndex objects in memory.
//
class CBlock
{
public:
// header
int nVersion;
uint256 hashPrevBlock;
uint256 hashMerkleRoot;
unsigned int nTime;
unsigned int nBits;
unsigned int nNonce;
// network and disk
vector<CTransaction> vtx;
// memory only
mutable vector<uint256> vMerkleTree;
CBlock()
{
SetNull();
}
IMPLEMENT_SERIALIZE
(
READWRITE(this->nVersion);
nVersion = this->nVersion;
READWRITE(hashPrevBlock);
READWRITE(hashMerkleRoot);
READWRITE(nTime);
READWRITE(nBits);
READWRITE(nNonce);
// ConnectBlock depends on vtx being last so it can calculate offset
if (!(nType & (SER_GETHASH|SER_BLOCKHEADERONLY)))
READWRITE(vtx);
else if (fRead)
const_cast<CBlock*>(this)->vtx.clear();
)
void SetNull()
{
nVersion = 1;
hashPrevBlock = 0;
hashMerkleRoot = 0;
nTime = 0;
nBits = 0;
nNonce = 0;
vtx.clear();
vMerkleTree.clear();
}
bool IsNull() const
{
return (nBits == 0);
}
uint256 GetHash() const
{
return Hash(BEGIN(nVersion), END(nNonce));
}
uint256 BuildMerkleTree() const
{
vMerkleTree.clear();
foreach(const CTransaction& tx, vtx)
vMerkleTree.push_back(tx.GetHash());
int j = 0;
for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
{
for (int i = 0; i < nSize; i += 2)
{
int i2 = min(i+1, nSize-1);
vMerkleTree.push_back(Hash(BEGIN(vMerkleTree[j+i]), END(vMerkleTree[j+i]),
BEGIN(vMerkleTree[j+i2]), END(vMerkleTree[j+i2])));
}
j += nSize;
}
return (vMerkleTree.empty() ? 0 : vMerkleTree.back());
}
vector<uint256> GetMerkleBranch(int nIndex) const
{
if (vMerkleTree.empty())
BuildMerkleTree();
vector<uint256> vMerkleBranch;
int j = 0;
for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
{
int i = min(nIndex^1, nSize-1);
vMerkleBranch.push_back(vMerkleTree[j+i]);
nIndex >>= 1;
j += nSize;
}
return vMerkleBranch;
}
static uint256 CheckMerkleBranch(uint256 hash, const vector<uint256>& vMerkleBranch, int nIndex)
{
if (nIndex == -1)
return 0;
foreach(const uint256& otherside, vMerkleBranch)
{
if (nIndex & 1)
hash = Hash(BEGIN(otherside), END(otherside), BEGIN(hash), END(hash));
else
hash = Hash(BEGIN(hash), END(hash), BEGIN(otherside), END(otherside));
nIndex >>= 1;
}
return hash;
}
bool WriteToDisk(bool fWriteTransactions, unsigned int& nFileRet, unsigned int& nBlockPosRet)
{
// Open history file to append
CAutoFile fileout = AppendBlockFile(nFileRet);
if (!fileout)
return error("CBlock::WriteToDisk() : AppendBlockFile failed");
if (!fWriteTransactions)
fileout.nType |= SER_BLOCKHEADERONLY;
// Write index header
unsigned int nSize = fileout.GetSerializeSize(*this);
fileout << FLATDATA(pchMessageStart) << nSize;
// Write block
nBlockPosRet = ftell(fileout);
if (nBlockPosRet == -1)
return error("CBlock::WriteToDisk() : ftell failed");
fileout << *this;
return true;
}
bool ReadFromDisk(unsigned int nFile, unsigned int nBlockPos, bool fReadTransactions)
{
SetNull();
// Open history file to read
CAutoFile filein = OpenBlockFile(nFile, nBlockPos, "rb");
if (!filein)
return error("CBlock::ReadFromDisk() : OpenBlockFile failed");
if (!fReadTransactions)
filein.nType |= SER_BLOCKHEADERONLY;
// Read block
filein >> *this;
// Check the header
if (CBigNum().SetCompact(nBits) > bnProofOfWorkLimit)
return error("CBlock::ReadFromDisk() : nBits errors in block header");
if (GetHash() > CBigNum().SetCompact(nBits).getuint256())
return error("CBlock::ReadFromDisk() : GetHash() errors in block header");
return true;
}
void print() const
{
printf("CBlock(hash=%s, ver=%d, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%d)\n",
GetHash().ToString().substr(0,14).c_str(),
nVersion,
hashPrevBlock.ToString().substr(0,14).c_str(),
hashMerkleRoot.ToString().substr(0,6).c_str(),
nTime, nBits, nNonce,
vtx.size());
for (int i = 0; i < vtx.size(); i++)
{
printf(" ");
vtx[i].print();
}
printf(" vMerkleTree: ");
for (int i = 0; i < vMerkleTree.size(); i++)
printf("%s ", vMerkleTree[i].ToString().substr(0,6).c_str());
printf("\n");
}
int64 GetBlockValue(int64 nFees) const;
bool DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex);
bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex);
bool ReadFromDisk(const CBlockIndex* blockindex, bool fReadTransactions);
bool AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos);
bool CheckBlock() const;
bool AcceptBlock();
};