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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_MAIN_H
#define BITCOIN_MAIN_H
#include "core.h"
#include "bignum.h"
#include "sync.h"
#include "txmempool.h"
#include "net.h"
#include "script.h"
#include "scrypt.h"
#include <limits>
#include <list>
class CBlock;
class CBlockIndex;
class CInv;
class CKeyItem;
class CNode;
class CReserveKey;
class CWallet;
/** The maximum allowed size for a serialized block, in bytes (network rule) */
static const unsigned int MAX_BLOCK_SIZE = 1000000;
/** The maximum size for mined blocks */
static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
/** The maximum size for transactions we're willing to relay/mine **/
static const unsigned int MAX_STANDARD_TX_SIZE = MAX_BLOCK_SIZE_GEN/5;
/** The maximum allowed number of signature check operations in a block (network rule) */
static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
/** Maxiumum number of signature check operations in an IsStandard() P2SH script */
static const unsigned int MAX_P2SH_SIGOPS = 15;
/** The maximum number of sigops we're willing to relay/mine in a single tx */
static const unsigned int MAX_TX_SIGOPS = MAX_BLOCK_SIGOPS/5;
/** The maximum number of orphan transactions kept in memory */
static const unsigned int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
/** Default for -maxorphanblocksmib, maximum number of memory to keep orphan blocks */
static const unsigned int DEFAULT_MAX_ORPHAN_BLOCKS = 40;
/** The maximum number of entries in an 'inv' protocol message */
static const unsigned int MAX_INV_SZ = 50000;
/** Fees smaller than this (in satoshi) are considered zero fee (for transaction creation) */
static const int64_t MIN_TX_FEE = 10000;
/** Fees smaller than this (in satoshi) are considered zero fee (for relaying) */
static const int64_t MIN_RELAY_TX_FEE = MIN_TX_FEE;
/** No amount larger than this (in satoshi) is valid */
static const int64_t MAX_MONEY = std::numeric_limits<int64_t>::max();
inline bool MoneyRange(int64_t nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
/** Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp. */
static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20 1985 UTC
static const int64_t COIN_YEAR_REWARD = 1 * CENT; // 1% per year
inline bool IsProtocolV1RetargetingFixed(int nHeight) { return TestNet() || nHeight > 38423; }
inline bool IsProtocolV2(int nHeight) { return TestNet() || nHeight > 319000; }
inline bool IsProtocolV3(int64_t nTime) { return TestNet() || nTime > 1444028400; }
inline int64_t FutureDriftV1(int64_t nTime) { return nTime + 10 * 60; }
inline int64_t FutureDriftV2(int64_t nTime) { return nTime + 15; }
inline int64_t FutureDrift(int64_t nTime, int nHeight) { return IsProtocolV2(nHeight) ? FutureDriftV2(nTime) : FutureDriftV1(nTime); }
inline unsigned int GetTargetSpacing(int nHeight) { return IsProtocolV2(nHeight) ? 64 : 60; }
extern CScript COINBASE_FLAGS;
extern CCriticalSection cs_main;
extern CTxMemPool mempool;
extern std::map<uint256, CBlockIndex*> mapBlockIndex;
extern std::set<std::pair<COutPoint, unsigned int> > setStakeSeen;
extern CBlockIndex* pindexGenesisBlock;
extern int nStakeMinConfirmations;
extern unsigned int nStakeMinAge;
extern unsigned int nNodeLifespan;
extern int nCoinbaseMaturity;
extern int nBestHeight;
extern uint256 nBestChainTrust;
extern uint256 nBestInvalidTrust;
extern uint256 hashBestChain;
extern CBlockIndex* pindexBest;
extern uint64_t nLastBlockTx;
extern uint64_t nLastBlockSize;
extern int64_t nLastCoinStakeSearchInterval;
extern const std::string strMessageMagic;
extern int64_t nTimeBestReceived;
extern bool fImporting;
extern bool fReindex;
struct COrphanBlock;
extern std::map<uint256, COrphanBlock*> mapOrphanBlocks;
extern bool fHaveGUI;
// Settings
extern bool fUseFastIndex;
extern unsigned int nDerivationMethodIndex;
// Minimum disk space required - used in CheckDiskSpace()
static const uint64_t nMinDiskSpace = 52428800;
class CReserveKey;
class CTxDB;
class CTxIndex;
class CWalletInterface;
/** Register a wallet to receive updates from core */
void RegisterWallet(CWalletInterface* pwalletIn);
/** Unregister a wallet from core */
void UnregisterWallet(CWalletInterface* pwalletIn);
/** Unregister all wallets from core */
void UnregisterAllWallets();
/** Push an updated transaction to all registered wallets */
void SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL, bool fConnect = true);
/** Ask wallets to resend their transactions */
void ResendWalletTransactions(bool fForce = false);
/** Register with a network node to receive its signals */
void RegisterNodeSignals(CNodeSignals& nodeSignals);
/** Unregister a network node */
void UnregisterNodeSignals(CNodeSignals& nodeSignals);
void PushGetBlocks(CNode* pnode, CBlockIndex* pindexBegin, uint256 hashEnd);
bool ProcessBlock(CNode* pfrom, CBlock* pblock);
bool CheckDiskSpace(uint64_t nAdditionalBytes=0);
FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode="rb");
FILE* AppendBlockFile(unsigned int& nFileRet);
bool LoadBlockIndex(bool fAllowNew=true);
void PrintBlockTree();
CBlockIndex* FindBlockByHeight(int nHeight);
bool ProcessMessages(CNode* pfrom);
bool SendMessages(CNode* pto, bool fSendTrickle);
void ThreadImport(std::vector<boost::filesystem::path> vImportFiles);
bool CheckProofOfWork(uint256 hash, unsigned int nBits);
unsigned int GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake);
int64_t GetProofOfWorkReward(int64_t nFees);
int64_t GetProofOfStakeReward(const CBlockIndex* pindexPrev, int64_t nCoinAge, int64_t nFees);
bool IsInitialBlockDownload();
bool IsConfirmedInNPrevBlocks(const CTxIndex& txindex, const CBlockIndex* pindexFrom, int nMaxDepth, int& nActualDepth);
std::string GetWarnings(std::string strFor);
bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock);
uint256 WantedByOrphan(const COrphanBlock* pblockOrphan);
const CBlockIndex* GetLastBlockIndex(const CBlockIndex* pindex, bool fProofOfStake);
void ThreadStakeMiner(CWallet *pwallet);
/** (try to) add transaction to memory pool **/
bool AcceptToMemoryPool(CTxMemPool& pool, CTransaction &tx, bool fLimitFree,
bool* pfMissingInputs);
/** Position on disk for a particular transaction. */
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 = (unsigned int) -1; nBlockPos = 0; nTxPos = 0; }
bool IsNull() const { return (nFile == (unsigned int) -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);
}
std::string ToString() const
{
if (IsNull())
return "null";
else
return strprintf("(nFile=%u, nBlockPos=%u, nTxPos=%u)", nFile, nBlockPos, nTxPos);
}
};
enum GetMinFee_mode
{
GMF_BLOCK,
GMF_RELAY,
GMF_SEND,
};
typedef std::map<uint256, std::pair<CTxIndex, CTransaction> > MapPrevTx;
int64_t GetMinFee(const CTransaction& tx, unsigned int nBlockSize = 1, enum GetMinFee_mode mode = GMF_BLOCK, unsigned int nBytes = 0);
/** The basic transaction that is broadcasted on the network and contained in
* blocks. A transaction can contain multiple inputs and outputs.
*/
class CTransaction
{
public:
static const int CURRENT_VERSION=1;
int nVersion;
unsigned int nTime;
std::vector<CTxIn> vin;
std::vector<CTxOut> vout;
unsigned int nLockTime;
// Denial-of-service detection:
mutable int nDoS;
bool DoS(int nDoSIn, bool fIn) const { nDoS += nDoSIn; return fIn; }
CTransaction()
{
SetNull();
}
CTransaction(int nVersion, unsigned int nTime, const std::vector<CTxIn>& vin, const std::vector<CTxOut>& vout, unsigned int nLockTime)
: nVersion(nVersion), nTime(nTime), vin(vin), vout(vout), nLockTime(nLockTime), nDoS(0)
{
}
IMPLEMENT_SERIALIZE
(
READWRITE(this->nVersion);
nVersion = this->nVersion;
READWRITE(nTime);
READWRITE(vin);
READWRITE(vout);
READWRITE(nLockTime);
)
void SetNull()
{
nVersion = CTransaction::CURRENT_VERSION;
nTime = GetAdjustedTime();
vin.clear();
vout.clear();
nLockTime = 0;
nDoS = 0; // Denial-of-service prevention
}
bool IsNull() const
{
return (vin.empty() && vout.empty());
}
uint256 GetHash() const
{
return SerializeHash(*this);
}
bool IsCoinBase() const
{
return (vin.size() == 1 && vin[0].prevout.IsNull() && vout.size() >= 1);
}
bool IsCoinStake() const
{
// ppcoin: the coin stake transaction is marked with the first output empty
return (vin.size() > 0 && (!vin[0].prevout.IsNull()) && vout.size() >= 2 && vout[0].IsEmpty());
}
/** Amount of bitcoins spent by this transaction.
@return sum of all outputs (note: does not include fees)
*/
int64_t GetValueOut() const
{
int64_t nValueOut = 0;
BOOST_FOREACH(const CTxOut& txout, vout)
{
nValueOut += txout.nValue;
if (!MoneyRange(txout.nValue) || !MoneyRange(nValueOut))
throw std::runtime_error("CTransaction::GetValueOut() : value out of range");
}
return nValueOut;
}
/** Amount of bitcoins coming in to this transaction
Note that lightweight clients may not know anything besides the hash of previous transactions,
so may not be able to calculate this.
@param[in] mapInputs Map of previous transactions that have outputs we're spending
@return Sum of value of all inputs (scriptSigs)
@see CTransaction::FetchInputs
*/
int64_t GetValueIn(const MapPrevTx& mapInputs) const;
bool ReadFromDisk(CDiskTxPos pos, FILE** pfileRet=NULL)
{
CAutoFile filein = CAutoFile(OpenBlockFile(pos.nFile, 0, pfileRet ? "rb+" : "rb"), SER_DISK, CLIENT_VERSION);
if (!filein)
return error("CTransaction::ReadFromDisk() : OpenBlockFile failed");
// Read transaction
if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
return error("CTransaction::ReadFromDisk() : fseek failed");
try {
filein >> *this;
}
catch (std::exception &e) {
return error("%s() : deserialize or I/O error", __PRETTY_FUNCTION__);
}
// 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.nTime == b.nTime &&
a.vin == b.vin &&
a.vout == b.vout &&
a.nLockTime == b.nLockTime);
}
friend bool operator!=(const CTransaction& a, const CTransaction& b)
{
return !(a == b);
}
std::string ToString() const
{
std::string str;
str += IsCoinBase()? "Coinbase" : (IsCoinStake()? "Coinstake" : "CTransaction");
str += strprintf("(hash=%s, nTime=%d, ver=%d, vin.size=%u, vout.size=%u, nLockTime=%d)\n",
GetHash().ToString(),
nTime,
nVersion,
vin.size(),
vout.size(),
nLockTime);
for (unsigned int i = 0; i < vin.size(); i++)
str += " " + vin[i].ToString() + "\n";
for (unsigned int i = 0; i < vout.size(); i++)
str += " " + vout[i].ToString() + "\n";
return str;
}
bool ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet);
bool ReadFromDisk(CTxDB& txdb, COutPoint prevout);
bool ReadFromDisk(COutPoint prevout);
bool DisconnectInputs(CTxDB& txdb);
/** Fetch from memory and/or disk. inputsRet keys are transaction hashes.
@param[in] txdb Transaction database
@param[in] mapTestPool List of pending changes to the transaction index database
@param[in] fBlock True if being called to add a new best-block to the chain
@param[in] fMiner True if being called by CreateNewBlock
@param[out] inputsRet Pointers to this transaction's inputs
@param[out] fInvalid returns true if transaction is invalid
@return Returns true if all inputs are in txdb or mapTestPool
*/
bool FetchInputs(CTxDB& txdb, const std::map<uint256, CTxIndex>& mapTestPool,
bool fBlock, bool fMiner, MapPrevTx& inputsRet, bool& fInvalid);
/** Sanity check previous transactions, then, if all checks succeed,
mark them as spent by this transaction.
@param[in] inputs Previous transactions (from FetchInputs)
@param[out] mapTestPool Keeps track of inputs that need to be updated on disk
@param[in] posThisTx Position of this transaction on disk
@param[in] pindexBlock
@param[in] fBlock true if called from ConnectBlock
@param[in] fMiner true if called from CreateNewBlock
@return Returns true if all checks succeed
*/
bool ConnectInputs(CTxDB& txdb, MapPrevTx inputs,
std::map<uint256, CTxIndex>& mapTestPool, const CDiskTxPos& posThisTx,
const CBlockIndex* pindexBlock, bool fBlock, bool fMiner, unsigned int flags = STANDARD_SCRIPT_VERIFY_FLAGS);
bool CheckTransaction() const;
bool GetCoinAge(CTxDB& txdb, const CBlockIndex* pindexPrev, uint64_t& nCoinAge) const;
const CTxOut& GetOutputFor(const CTxIn& input, const MapPrevTx& inputs) const;
};
/** wrapper for CTxOut that provides a more compact serialization */
class CTxOutCompressor
{
private:
CTxOut &txout;
public:
CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { }
IMPLEMENT_SERIALIZE(
READWRITE(VARINT(txout.nValue));
CScriptCompressor cscript(REF(txout.scriptPubKey));
READWRITE(cscript);
)
};
/** Check for standard transaction types
@param[in] mapInputs Map of previous transactions that have outputs we're spending
@return True if all inputs (scriptSigs) use only standard transaction forms
@see CTransaction::FetchInputs
*/
bool AreInputsStandard(const CTransaction& tx, const MapPrevTx& mapInputs);
/** Count ECDSA signature operations the old-fashioned (pre-0.6) way
@return number of sigops this transaction's outputs will produce when spent
@see CTransaction::FetchInputs
*/
unsigned int GetLegacySigOpCount(const CTransaction& tx);
/** Count ECDSA signature operations in pay-to-script-hash inputs.
@param[in] mapInputs Map of previous transactions that have outputs we're spending
@return maximum number of sigops required to validate this transaction's inputs
@see CTransaction::FetchInputs
*/
unsigned int GetP2SHSigOpCount(const CTransaction& tx, const MapPrevTx& mapInputs);
/** Check for standard transaction types
@return True if all outputs (scriptPubKeys) use only standard transaction forms
*/
bool IsStandardTx(const CTransaction& tx, std::string& reason);
bool IsFinalTx(const CTransaction &tx, int nBlockHeight = 0, int64_t nBlockTime = 0);
/** A transaction with a merkle branch linking it to the block chain. */
class CMerkleTx : public CTransaction
{
private:
int GetDepthInMainChainINTERNAL(CBlockIndex* &pindexRet) const;
public:
uint256 hashBlock;
std::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;
}
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);
// Return depth of transaction in blockchain:
// -1 : not in blockchain, and not in memory pool (conflicted transaction)
// 0 : in memory pool, waiting to be included in a block
// >=1 : this many blocks deep in the main chain
int GetDepthInMainChain(CBlockIndex* &pindexRet) const;
int GetDepthInMainChain() const { CBlockIndex *pindexRet; return GetDepthInMainChain(pindexRet); }
bool IsInMainChain() const { CBlockIndex *pindexRet; return GetDepthInMainChainINTERNAL(pindexRet) > 0; }
int GetBlocksToMaturity() const;
bool AcceptToMemoryPool(bool fLimitFree=true);
};
/** 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;
std::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)
{
return (a.pos == b.pos &&
a.vSpent == b.vSpent);
}
friend bool operator!=(const CTxIndex& a, const CTxIndex& b)
{
return !(a == b);
}
int GetDepthInMainChain() const;
};
/** 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
static const int CURRENT_VERSION = 7;
int nVersion;
uint256 hashPrevBlock;
uint256 hashMerkleRoot;
unsigned int nTime;
unsigned int nBits;
unsigned int nNonce;
// network and disk
std::vector<CTransaction> vtx;
// ppcoin: block signature - signed by one of the coin base txout[N]'s owner
std::vector<unsigned char> vchBlockSig;
// memory only
mutable std::vector<uint256> vMerkleTree;
// Denial-of-service detection:
mutable int nDoS;
bool DoS(int nDoSIn, bool fIn) const { nDoS += nDoSIn; return fIn; }
CBlock()
{
SetNull();
}
IMPLEMENT_SERIALIZE
(
READWRITE(this->nVersion);
nVersion = this->nVersion;
READWRITE(hashPrevBlock);
READWRITE(hashMerkleRoot);
READWRITE(nTime);
READWRITE(nBits);
READWRITE(nNonce);
// ConnectBlock depends on vtx following header to generate CDiskTxPos
if (!(nType & (SER_GETHASH|SER_BLOCKHEADERONLY)))
{
READWRITE(vtx);
READWRITE(vchBlockSig);
}
else if (fRead)
{
const_cast<CBlock*>(this)->vtx.clear();
const_cast<CBlock*>(this)->vchBlockSig.clear();
}
)
void SetNull()
{
nVersion = CBlock::CURRENT_VERSION;
hashPrevBlock = 0;
hashMerkleRoot = 0;
nTime = 0;
nBits = 0;
nNonce = 0;
vtx.clear();
vchBlockSig.clear();
vMerkleTree.clear();
nDoS = 0;
}
bool IsNull() const
{
return (nBits == 0);
}
uint256 GetHash() const
{
if (nVersion > 6)
return Hash(BEGIN(nVersion), END(nNonce));
else
return GetPoWHash();
}
uint256 GetPoWHash() const
{
return scrypt_blockhash(CVOIDBEGIN(nVersion));
}
int64_t GetBlockTime() const
{
return (int64_t)nTime;
}
void UpdateTime(const CBlockIndex* pindexPrev);
// entropy bit for stake modifier if chosen by modifier
unsigned int GetStakeEntropyBit() const
{
// Take last bit of block hash as entropy bit
unsigned int nEntropyBit = ((GetHash().GetLow64()) & 1llu);
LogPrint("stakemodifier", "GetStakeEntropyBit: hashBlock=%s nEntropyBit=%u\n", GetHash().ToString(), nEntropyBit);
return nEntropyBit;
}
// ppcoin: two types of block: proof-of-work or proof-of-stake
bool IsProofOfStake() const
{
return (vtx.size() > 1 && vtx[1].IsCoinStake());
}
bool IsProofOfWork() const
{
return !IsProofOfStake();
}
std::pair<COutPoint, unsigned int> GetProofOfStake() const
{
return IsProofOfStake()? std::make_pair(vtx[1].vin[0].prevout, vtx[1].nTime) : std::make_pair(COutPoint(), (unsigned int)0);
}
// ppcoin: get max transaction timestamp
int64_t GetMaxTransactionTime() const
{
int64_t maxTransactionTime = 0;
BOOST_FOREACH(const CTransaction& tx, vtx)
maxTransactionTime = std::max(maxTransactionTime, (int64_t)tx.nTime);
return maxTransactionTime;
}
uint256 BuildMerkleTree() const
{
vMerkleTree.clear();
BOOST_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 = std::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());
}
std::vector<uint256> GetMerkleBranch(int nIndex) const
{
if (vMerkleTree.empty())
BuildMerkleTree();
std::vector<uint256> vMerkleBranch;
int j = 0;
for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
{
int i = std::min(nIndex^1, nSize-1);
vMerkleBranch.push_back(vMerkleTree[j+i]);
nIndex >>= 1;
j += nSize;
}
return vMerkleBranch;
}
static uint256 CheckMerkleBranch(uint256 hash, const std::vector<uint256>& vMerkleBranch, int nIndex)
{
if (nIndex == -1)
return 0;
BOOST_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(unsigned int& nFileRet, unsigned int& nBlockPosRet)
{
// Open history file to append
CAutoFile fileout = CAutoFile(AppendBlockFile(nFileRet), SER_DISK, CLIENT_VERSION);
if (!fileout)
return error("CBlock::WriteToDisk() : AppendBlockFile failed");
// Write index header
unsigned int nSize = fileout.GetSerializeSize(*this);
fileout << FLATDATA(Params().MessageStart()) << nSize;
// Write block
long fileOutPos = ftell(fileout);
if (fileOutPos < 0)
return error("CBlock::WriteToDisk() : ftell failed");
nBlockPosRet = fileOutPos;
fileout << *this;
// Flush stdio buffers and commit to disk before returning
fflush(fileout);
if (!IsInitialBlockDownload() || (nBestHeight+1) % 500 == 0)
FileCommit(fileout);
return true;
}
bool ReadFromDisk(unsigned int nFile, unsigned int nBlockPos, bool fReadTransactions=true)
{
SetNull();
// Open history file to read
CAutoFile filein = CAutoFile(OpenBlockFile(nFile, nBlockPos, "rb"), SER_DISK, CLIENT_VERSION);
if (!filein)
return error("CBlock::ReadFromDisk() : OpenBlockFile failed");
if (!fReadTransactions)
filein.nType |= SER_BLOCKHEADERONLY;
// Read block
try {
filein >> *this;
}
catch (std::exception &e) {
return error("%s() : deserialize or I/O error", __PRETTY_FUNCTION__);
}
// Check the header
if (fReadTransactions && IsProofOfWork() && !CheckProofOfWork(GetPoWHash(), nBits))
return error("CBlock::ReadFromDisk() : errors in block header");
return true;
}
std::string ToString() const
{
std::stringstream s;
s << strprintf("CBlock(hash=%s, ver=%d, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%u, vchBlockSig=%s)\n",
GetHash().ToString(),
nVersion,
hashPrevBlock.ToString(),
hashMerkleRoot.ToString(),
nTime, nBits, nNonce,
vtx.size(),
HexStr(vchBlockSig.begin(), vchBlockSig.end()));
for (unsigned int i = 0; i < vtx.size(); i++)
{
s << " " << vtx[i].ToString() << "\n";
}
s << " vMerkleTree: ";
for (unsigned int i = 0; i < vMerkleTree.size(); i++)
s << " " << vMerkleTree[i].ToString();
s << "\n";
return s.str();
}
bool DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex);
bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck=false);
bool ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions=true);
bool SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew);
bool AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos, const uint256& hashProof);
bool CheckBlock(bool fCheckPOW=true, bool fCheckMerkleRoot=true, bool fCheckSig=true) const;
bool AcceptBlock();
bool SignBlock(CWallet& keystore, int64_t nFees);
bool CheckBlockSignature() const;
private:
bool SetBestChainInner(CTxDB& txdb, CBlockIndex *pindexNew);
};
/** The block chain is a tree shaped structure starting with the
* genesis block at the root, with each block potentially having multiple
* candidates to be the next block. pprev and pnext link a path through the
* main/longest chain. A blockindex may have multiple pprev pointing back
* to it, but pnext will only point forward to the longest branch, or will
* be null if the block is not part of the longest chain.
*/
class CBlockIndex
{
public:
const uint256* phashBlock;
CBlockIndex* pprev;
CBlockIndex* pnext;
unsigned int nFile;
unsigned int nBlockPos;
uint256 nChainTrust; // ppcoin: trust score of block chain
int nHeight;
int64_t nMint;
int64_t nMoneySupply;
unsigned int nFlags; // ppcoin: block index flags
enum
{
BLOCK_PROOF_OF_STAKE = (1 << 0), // is proof-of-stake block
BLOCK_STAKE_ENTROPY = (1 << 1), // entropy bit for stake modifier
BLOCK_STAKE_MODIFIER = (1 << 2), // regenerated stake modifier
};
uint64_t nStakeModifier; // hash modifier for proof-of-stake
uint256 bnStakeModifierV2;
// proof-of-stake specific fields
COutPoint prevoutStake;
unsigned int nStakeTime;
uint256 hashProof;
// block header
int nVersion;
uint256 hashMerkleRoot;
unsigned int nTime;
unsigned int nBits;
unsigned int nNonce;
CBlockIndex()
{
phashBlock = NULL;
pprev = NULL;
pnext = NULL;
nFile = 0;
nBlockPos = 0;
nHeight = 0;
nChainTrust = 0;
nMint = 0;
nMoneySupply = 0;
nFlags = 0;
nStakeModifier = 0;
bnStakeModifierV2 = 0;
hashProof = 0;
prevoutStake.SetNull();
nStakeTime = 0;
nVersion = 0;
hashMerkleRoot = 0;
nTime = 0;
nBits = 0;
nNonce = 0;
}
CBlockIndex(unsigned int nFileIn, unsigned int nBlockPosIn, CBlock& block)
{
phashBlock = NULL;
pprev = NULL;
pnext = NULL;
nFile = nFileIn;
nBlockPos = nBlockPosIn;
nHeight = 0;
nChainTrust = 0;
nMint = 0;
nMoneySupply = 0;
nFlags = 0;
nStakeModifier = 0;
bnStakeModifierV2 = 0;
hashProof = 0;
if (block.IsProofOfStake())
{
SetProofOfStake();
prevoutStake = block.vtx[1].vin[0].prevout;
nStakeTime = block.vtx[1].nTime;
}
else
{
prevoutStake.SetNull();
nStakeTime = 0;
}
nVersion = block.nVersion;
hashMerkleRoot = block.hashMerkleRoot;
nTime = block.nTime;
nBits = block.nBits;
nNonce = block.nNonce;
}
CBlock GetBlockHeader() const
{
CBlock block;
block.nVersion = nVersion;
if (pprev)
block.hashPrevBlock = pprev->GetBlockHash();
block.hashMerkleRoot = hashMerkleRoot;
block.nTime = nTime;
block.nBits = nBits;
block.nNonce = nNonce;
return block;
}
uint256 GetBlockHash() const
{
return *phashBlock;
}
int64_t GetBlockTime() const
{
return (int64_t)nTime;
}
uint256 GetBlockTrust() const;
bool IsInMainChain() const
{
return (pnext || this == pindexBest);
}
bool CheckIndex() const
{
return true;
}
int64_t GetPastTimeLimit() const
{
if (IsProtocolV2(nHeight))
return GetBlockTime();
else
return GetMedianTimePast();
}
enum { nMedianTimeSpan=11 };
int64_t GetMedianTimePast() const
{
int64_t pmedian[nMedianTimeSpan];
int64_t* pbegin = &pmedian[nMedianTimeSpan];
int64_t* pend = &pmedian[nMedianTimeSpan];
const CBlockIndex* pindex = this;
for (int i = 0; i < nMedianTimeSpan && pindex; i++, pindex = pindex->pprev)
*(--pbegin) = pindex->GetBlockTime();
std::sort(pbegin, pend);
return pbegin[(pend - pbegin)/2];
}
/**
* Returns true if there are nRequired or more blocks of minVersion or above
* in the last nToCheck blocks, starting at pstart and going backwards.
*/
static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart,
unsigned int nRequired, unsigned int nToCheck);
bool IsProofOfWork() const
{
return !(nFlags & BLOCK_PROOF_OF_STAKE);
}
bool IsProofOfStake() const
{
return (nFlags & BLOCK_PROOF_OF_STAKE);
}
void SetProofOfStake()
{
nFlags |= BLOCK_PROOF_OF_STAKE;
}
unsigned int GetStakeEntropyBit() const
{
return ((nFlags & BLOCK_STAKE_ENTROPY) >> 1);
}
bool SetStakeEntropyBit(unsigned int nEntropyBit)
{
if (nEntropyBit > 1)
return false;
nFlags |= (nEntropyBit? BLOCK_STAKE_ENTROPY : 0);
return true;
}
bool GeneratedStakeModifier() const
{
return (nFlags & BLOCK_STAKE_MODIFIER);
}
void SetStakeModifier(uint64_t nModifier, bool fGeneratedStakeModifier)
{
nStakeModifier = nModifier;
if (fGeneratedStakeModifier)
nFlags |= BLOCK_STAKE_MODIFIER;
}
std::string ToString() const
{
return strprintf("CBlockIndex(nprev=%p, pnext=%p, nFile=%u, nBlockPos=%-6d nHeight=%d, nMint=%s, nMoneySupply=%s, nFlags=(%s)(%d)(%s), nStakeModifier=%016x, hashProof=%s, prevoutStake=(%s), nStakeTime=%d merkle=%s, hashBlock=%s)",
pprev, pnext, nFile, nBlockPos, nHeight,
FormatMoney(nMint), FormatMoney(nMoneySupply),
GeneratedStakeModifier() ? "MOD" : "-", GetStakeEntropyBit(), IsProofOfStake()? "PoS" : "PoW",
nStakeModifier,
hashProof.ToString(),
prevoutStake.ToString(), nStakeTime,
hashMerkleRoot.ToString(),
GetBlockHash().ToString());
}
};
/** Used to marshal pointers into hashes for db storage. */
class CDiskBlockIndex : public CBlockIndex
{
private:
uint256 blockHash;
public:
uint256 hashPrev;
uint256 hashNext;
CDiskBlockIndex()
{
hashPrev = 0;
hashNext = 0;
blockHash = 0;
}
explicit CDiskBlockIndex(CBlockIndex* pindex) : CBlockIndex(*pindex)
{
hashPrev = (pprev ? pprev->GetBlockHash() : 0);
hashNext = (pnext ? pnext->GetBlockHash() : 0);
}
IMPLEMENT_SERIALIZE
(
if (!(nType & SER_GETHASH))
READWRITE(nVersion);
READWRITE(hashNext);
READWRITE(nFile);
READWRITE(nBlockPos);
READWRITE(nHeight);
READWRITE(nMint);
READWRITE(nMoneySupply);
READWRITE(nFlags);
READWRITE(nStakeModifier);
READWRITE(bnStakeModifierV2);
if (IsProofOfStake())
{
READWRITE(prevoutStake);
READWRITE(nStakeTime);
}
else if (fRead)
{
const_cast<CDiskBlockIndex*>(this)->prevoutStake.SetNull();
const_cast<CDiskBlockIndex*>(this)->nStakeTime = 0;
}
READWRITE(hashProof);
// block header
READWRITE(this->nVersion);
READWRITE(hashPrev);
READWRITE(hashMerkleRoot);
READWRITE(nTime);
READWRITE(nBits);
READWRITE(nNonce);
READWRITE(blockHash);
)
uint256 GetBlockHash() const
{
if (fUseFastIndex && (nTime < GetAdjustedTime() - 24 * 60 * 60) && blockHash != 0)
return blockHash;
CBlock block;
block.nVersion = nVersion;
block.hashPrevBlock = hashPrev;
block.hashMerkleRoot = hashMerkleRoot;
block.nTime = nTime;
block.nBits = nBits;
block.nNonce = nNonce;
const_cast<CDiskBlockIndex*>(this)->blockHash = block.GetHash();
return blockHash;
}
std::string ToString() const
{
std::string str = "CDiskBlockIndex(";
str += CBlockIndex::ToString();
str += strprintf("\n hashBlock=%s, hashPrev=%s, hashNext=%s)",
GetBlockHash().ToString(),
hashPrev.ToString(),
hashNext.ToString());
return str;
}
};
/** Describes a place in the block chain to another node such that if the
* other node doesn't have the same branch, it can find a recent common trunk.
* The further back it is, the further before the fork it may be.
*/
class CBlockLocator
{
protected:
std::vector<uint256> vHave;
public:
CBlockLocator()
{
}
explicit CBlockLocator(const CBlockIndex* pindex)
{
Set(pindex);
}
explicit CBlockLocator(uint256 hashBlock)
{
std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
if (mi != mapBlockIndex.end())
Set((*mi).second);
}
CBlockLocator(const std::vector<uint256>& vHaveIn)
{
vHave = vHaveIn;
}
IMPLEMENT_SERIALIZE
(
if (!(nType & SER_GETHASH))
READWRITE(nVersion);
READWRITE(vHave);
)
void SetNull()
{
vHave.clear();
}
bool IsNull()
{
return vHave.empty();
}
void Set(const CBlockIndex* pindex)
{
vHave.clear();
int nStep = 1;
while (pindex)
{
vHave.push_back(pindex->GetBlockHash());
// Exponentially larger steps back
for (int i = 0; pindex && i < nStep; i++)
pindex = pindex->pprev;
if (vHave.size() > 10)
nStep *= 2;
}
vHave.push_back(Params().HashGenesisBlock());
}
int GetDistanceBack()
{
// Retrace how far back it was in the sender's branch
int nDistance = 0;
int nStep = 1;
BOOST_FOREACH(const uint256& hash, vHave)
{
std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
if (mi != mapBlockIndex.end())
{
CBlockIndex* pindex = (*mi).second;
if (pindex->IsInMainChain())
return nDistance;
}
nDistance += nStep;
if (nDistance > 10)
nStep *= 2;
}
return nDistance;
}
CBlockIndex* GetBlockIndex()
{
// Find the first block the caller has in the main chain
BOOST_FOREACH(const uint256& hash, vHave)
{
std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
if (mi != mapBlockIndex.end())
{
CBlockIndex* pindex = (*mi).second;
if (pindex->IsInMainChain())
return pindex;
}
}
return pindexGenesisBlock;
}
uint256 GetBlockHash()
{
// Find the first block the caller has in the main chain
BOOST_FOREACH(const uint256& hash, vHave)
{
std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
if (mi != mapBlockIndex.end())
{
CBlockIndex* pindex = (*mi).second;
if (pindex->IsInMainChain())
return hash;
}
}
return Params().HashGenesisBlock();
}
int GetHeight()
{
CBlockIndex* pindex = GetBlockIndex();
if (!pindex)
return 0;
return pindex->nHeight;
}
};
class CWalletInterface {
protected:
virtual void SyncTransaction(const CTransaction &tx, const CBlock *pblock, bool fConnect) =0;
virtual void EraseFromWallet(const uint256 &hash) =0;
virtual void SetBestChain(const CBlockLocator &locator) =0;
virtual void UpdatedTransaction(const uint256 &hash) =0;
virtual void Inventory(const uint256 &hash) =0;
virtual void ResendWalletTransactions(bool fForce) =0;
friend void ::RegisterWallet(CWalletInterface*);
friend void ::UnregisterWallet(CWalletInterface*);
friend void ::UnregisterAllWallets();
};
#endif