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litecoin/main.cpp

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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.
#include "headers.h"
#include "sha.h"
//
// Global state
//
CCriticalSection cs_main;
map<uint256, CTransaction> mapTransactions;
CCriticalSection cs_mapTransactions;
unsigned int nTransactionsUpdated = 0;
map<COutPoint, CInPoint> mapNextTx;
map<uint256, CBlockIndex*> mapBlockIndex;
const uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
CBlockIndex* pindexGenesisBlock = NULL;
int nBestHeight = -1;
uint256 hashBestChain = 0;
CBlockIndex* pindexBest = NULL;
map<uint256, CBlock*> mapOrphanBlocks;
multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
map<uint256, CDataStream*> mapOrphanTransactions;
multimap<uint256, CDataStream*> mapOrphanTransactionsByPrev;
map<uint256, CWalletTx> mapWallet;
vector<uint256> vWalletUpdated;
CCriticalSection cs_mapWallet;
map<vector<unsigned char>, CPrivKey> mapKeys;
map<uint160, vector<unsigned char> > mapPubKeys;
CCriticalSection cs_mapKeys;
CKey keyUser;
string strSetDataDir;
int nDropMessagesTest = 0;
// Settings
int fGenerateBitcoins = false;
int64 nTransactionFee = 0;
CAddress addrIncoming;
int fLimitProcessors = false;
int nLimitProcessors = 1;
//////////////////////////////////////////////////////////////////////////////
//
// mapKeys
//
bool AddKey(const CKey& key)
{
CRITICAL_BLOCK(cs_mapKeys)
{
mapKeys[key.GetPubKey()] = key.GetPrivKey();
mapPubKeys[Hash160(key.GetPubKey())] = key.GetPubKey();
}
return CWalletDB().WriteKey(key.GetPubKey(), key.GetPrivKey());
}
vector<unsigned char> GenerateNewKey()
{
CKey key;
key.MakeNewKey();
if (!AddKey(key))
throw runtime_error("GenerateNewKey() : AddKey failed\n");
return key.GetPubKey();
}
//////////////////////////////////////////////////////////////////////////////
//
// mapWallet
//
bool AddToWallet(const CWalletTx& wtxIn)
{
uint256 hash = wtxIn.GetHash();
CRITICAL_BLOCK(cs_mapWallet)
{
// Inserts only if not already there, returns tx inserted or tx found
pair<map<uint256, CWalletTx>::iterator, bool> ret = mapWallet.insert(make_pair(hash, wtxIn));
CWalletTx& wtx = (*ret.first).second;
bool fInsertedNew = ret.second;
if (fInsertedNew)
wtx.nTimeReceived = GetAdjustedTime();
//// debug print
printf("AddToWallet %s %s\n", wtxIn.GetHash().ToString().substr(0,6).c_str(), fInsertedNew ? "new" : "update");
if (!fInsertedNew)
{
// Merge
bool fUpdated = false;
if (wtxIn.hashBlock != 0 && wtxIn.hashBlock != wtx.hashBlock)
{
wtx.hashBlock = wtxIn.hashBlock;
fUpdated = true;
}
if (wtxIn.nIndex != -1 && (wtxIn.vMerkleBranch != wtx.vMerkleBranch || wtxIn.nIndex != wtx.nIndex))
{
wtx.vMerkleBranch = wtxIn.vMerkleBranch;
wtx.nIndex = wtxIn.nIndex;
fUpdated = true;
}
if (wtxIn.fFromMe && wtxIn.fFromMe != wtx.fFromMe)
{
wtx.fFromMe = wtxIn.fFromMe;
fUpdated = true;
}
if (wtxIn.fSpent && wtxIn.fSpent != wtx.fSpent)
{
wtx.fSpent = wtxIn.fSpent;
fUpdated = true;
}
if (!fUpdated)
return true;
}
// Write to disk
if (!wtx.WriteToDisk())
return false;
// Notify UI
vWalletUpdated.push_back(hash);
}
// Refresh UI
MainFrameRepaint();
return true;
}
bool AddToWalletIfMine(const CTransaction& tx, const CBlock* pblock)
{
if (tx.IsMine() || mapWallet.count(tx.GetHash()))
{
CWalletTx wtx(tx);
// Get merkle branch if transaction was found in a block
if (pblock)
wtx.SetMerkleBranch(pblock);
return AddToWallet(wtx);
}
return true;
}
bool EraseFromWallet(uint256 hash)
{
CRITICAL_BLOCK(cs_mapWallet)
{
if (mapWallet.erase(hash))
CWalletDB().EraseTx(hash);
}
return true;
}
//////////////////////////////////////////////////////////////////////////////
//
// mapOrphanTransactions
//
void AddOrphanTx(const CDataStream& vMsg)
{
CTransaction tx;
CDataStream(vMsg) >> tx;
uint256 hash = tx.GetHash();
if (mapOrphanTransactions.count(hash))
return;
CDataStream* pvMsg = mapOrphanTransactions[hash] = new CDataStream(vMsg);
foreach(const CTxIn& txin, tx.vin)
mapOrphanTransactionsByPrev.insert(make_pair(txin.prevout.hash, pvMsg));
}
void EraseOrphanTx(uint256 hash)
{
if (!mapOrphanTransactions.count(hash))
return;
const CDataStream* pvMsg = mapOrphanTransactions[hash];
CTransaction tx;
CDataStream(*pvMsg) >> tx;
foreach(const CTxIn& txin, tx.vin)
{
for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(txin.prevout.hash);
mi != mapOrphanTransactionsByPrev.upper_bound(txin.prevout.hash);)
{
if ((*mi).second == pvMsg)
mapOrphanTransactionsByPrev.erase(mi++);
else
mi++;
}
}
delete pvMsg;
mapOrphanTransactions.erase(hash);
}
//////////////////////////////////////////////////////////////////////////////
//
// CTransaction
//
bool CTxIn::IsMine() const
{
CRITICAL_BLOCK(cs_mapWallet)
{
map<uint256, CWalletTx>::iterator mi = mapWallet.find(prevout.hash);
if (mi != mapWallet.end())
{
const CWalletTx& prev = (*mi).second;
if (prevout.n < prev.vout.size())
if (prev.vout[prevout.n].IsMine())
return true;
}
}
return false;
}
int64 CTxIn::GetDebit() const
{
CRITICAL_BLOCK(cs_mapWallet)
{
map<uint256, CWalletTx>::iterator mi = mapWallet.find(prevout.hash);
if (mi != mapWallet.end())
{
const CWalletTx& prev = (*mi).second;
if (prevout.n < prev.vout.size())
if (prev.vout[prevout.n].IsMine())
return prev.vout[prevout.n].nValue;
}
}
return 0;
}
int64 CWalletTx::GetTxTime() const
{
if (!fTimeReceivedIsTxTime && hashBlock != 0)
{
// If we did not receive the transaction directly, we rely on the block's
// time to figure out when it happened. We use the median over a range
// of blocks to try to filter out inaccurate block times.
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
if (mi != mapBlockIndex.end())
{
CBlockIndex* pindex = (*mi).second;
if (pindex)
return pindex->GetMedianTime();
}
}
return nTimeReceived;
}
int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
{
if (fClient)
{
if (hashBlock == 0)
return 0;
}
else
{
CBlock blockTmp;
if (pblock == NULL)
{
// Load the block this tx is in
CTxIndex txindex;
if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
return 0;
if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, true))
return 0;
pblock = &blockTmp;
}
// Update the tx's hashBlock
hashBlock = pblock->GetHash();
// Locate the transaction
for (nIndex = 0; nIndex < pblock->vtx.size(); nIndex++)
if (pblock->vtx[nIndex] == *(CTransaction*)this)
break;
if (nIndex == pblock->vtx.size())
{
vMerkleBranch.clear();
nIndex = -1;
printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
return 0;
}
// Fill in merkle branch
vMerkleBranch = pblock->GetMerkleBranch(nIndex);
}
// Is the tx in a block that's in the main chain
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
if (mi == mapBlockIndex.end())
return 0;
CBlockIndex* pindex = (*mi).second;
if (!pindex || !pindex->IsInMainChain())
return 0;
return pindexBest->nHeight - pindex->nHeight + 1;
}
void CWalletTx::AddSupportingTransactions(CTxDB& txdb)
{
vtxPrev.clear();
const int COPY_DEPTH = 3;
if (SetMerkleBranch() < COPY_DEPTH)
{
vector<uint256> vWorkQueue;
foreach(const CTxIn& txin, vin)
vWorkQueue.push_back(txin.prevout.hash);
// This critsect is OK because txdb is already open
CRITICAL_BLOCK(cs_mapWallet)
{
map<uint256, const CMerkleTx*> mapWalletPrev;
set<uint256> setAlreadyDone;
for (int i = 0; i < vWorkQueue.size(); i++)
{
uint256 hash = vWorkQueue[i];
if (setAlreadyDone.count(hash))
continue;
setAlreadyDone.insert(hash);
CMerkleTx tx;
if (mapWallet.count(hash))
{
tx = mapWallet[hash];
foreach(const CMerkleTx& txWalletPrev, mapWallet[hash].vtxPrev)
mapWalletPrev[txWalletPrev.GetHash()] = &txWalletPrev;
}
else if (mapWalletPrev.count(hash))
{
tx = *mapWalletPrev[hash];
}
else if (!fClient && txdb.ReadDiskTx(hash, tx))
{
;
}
else
{
printf("ERROR: AddSupportingTransactions() : unsupported transaction\n");
continue;
}
int nDepth = tx.SetMerkleBranch();
vtxPrev.push_back(tx);
if (nDepth < COPY_DEPTH)
foreach(const CTxIn& txin, tx.vin)
vWorkQueue.push_back(txin.prevout.hash);
}
}
}
reverse(vtxPrev.begin(), vtxPrev.end());
}
bool CTransaction::AcceptTransaction(CTxDB& txdb, bool fCheckInputs, bool* pfMissingInputs)
{
if (pfMissingInputs)
*pfMissingInputs = false;
// Coinbase is only valid in a block, not as a loose transaction
if (IsCoinBase())
return error("AcceptTransaction() : coinbase as individual tx");
if (!CheckTransaction())
return error("AcceptTransaction() : CheckTransaction failed");
// To help v0.1.5 clients who would see it as negative number. please delete this later.
if (nLockTime > INT_MAX)
return error("AcceptTransaction() : not accepting nLockTime beyond 2038");
// Do we already have it?
uint256 hash = GetHash();
CRITICAL_BLOCK(cs_mapTransactions)
if (mapTransactions.count(hash))
return false;
if (fCheckInputs)
if (txdb.ContainsTx(hash))
return false;
// Check for conflicts with in-memory transactions
CTransaction* ptxOld = NULL;
for (int i = 0; i < vin.size(); i++)
{
COutPoint outpoint = vin[i].prevout;
if (mapNextTx.count(outpoint))
{
// Allow replacing with a newer version of the same transaction
if (i != 0)
return false;
ptxOld = mapNextTx[outpoint].ptx;
if (!IsNewerThan(*ptxOld))
return false;
for (int i = 0; i < vin.size(); i++)
{
COutPoint outpoint = vin[i].prevout;
if (!mapNextTx.count(outpoint) || mapNextTx[outpoint].ptx != ptxOld)
return false;
}
break;
}
}
// Check against previous transactions
map<uint256, CTxIndex> mapUnused;
int64 nFees = 0;
if (fCheckInputs && !ConnectInputs(txdb, mapUnused, CDiskTxPos(1,1,1), 0, nFees, false, false))
{
if (pfMissingInputs)
*pfMissingInputs = true;
return error("AcceptTransaction() : ConnectInputs failed %s", hash.ToString().substr(0,6).c_str());
}
// Store transaction in memory
CRITICAL_BLOCK(cs_mapTransactions)
{
if (ptxOld)
{
printf("mapTransaction.erase(%s) replacing with new version\n", ptxOld->GetHash().ToString().c_str());
mapTransactions.erase(ptxOld->GetHash());
}
AddToMemoryPool();
}
///// are we sure this is ok when loading transactions or restoring block txes
// If updated, erase old tx from wallet
if (ptxOld)
EraseFromWallet(ptxOld->GetHash());
printf("AcceptTransaction(): accepted %s\n", hash.ToString().substr(0,6).c_str());
return true;
}
bool CTransaction::AddToMemoryPool()
{
// Add to memory pool without checking anything. Don't call this directly,
// call AcceptTransaction to properly check the transaction first.
CRITICAL_BLOCK(cs_mapTransactions)
{
uint256 hash = GetHash();
mapTransactions[hash] = *this;
for (int i = 0; i < vin.size(); i++)
mapNextTx[vin[i].prevout] = CInPoint(&mapTransactions[hash], i);
nTransactionsUpdated++;
}
return true;
}
bool CTransaction::RemoveFromMemoryPool()
{
// Remove transaction from memory pool
CRITICAL_BLOCK(cs_mapTransactions)
{
foreach(const CTxIn& txin, vin)
mapNextTx.erase(txin.prevout);
mapTransactions.erase(GetHash());
nTransactionsUpdated++;
}
return true;
}
int CMerkleTx::GetDepthInMainChain() const
{
if (hashBlock == 0 || nIndex == -1)
return 0;
// Find the block it claims to be in
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
if (mi == mapBlockIndex.end())
return 0;
CBlockIndex* pindex = (*mi).second;
if (!pindex || !pindex->IsInMainChain())
return 0;
// Make sure the merkle branch connects to this block
if (!fMerkleVerified)
{
if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
return 0;
fMerkleVerified = true;
}
return pindexBest->nHeight - pindex->nHeight + 1;
}
int CMerkleTx::GetBlocksToMaturity() const
{
if (!IsCoinBase())
return 0;
return max(0, (COINBASE_MATURITY+20) - GetDepthInMainChain());
}
bool CMerkleTx::AcceptTransaction(CTxDB& txdb, bool fCheckInputs)
{
if (fClient)
{
if (!IsInMainChain() && !ClientConnectInputs())
return false;
return CTransaction::AcceptTransaction(txdb, false);
}
else
{
return CTransaction::AcceptTransaction(txdb, fCheckInputs);
}
}
bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
{
CRITICAL_BLOCK(cs_mapTransactions)
{
foreach(CMerkleTx& tx, vtxPrev)
{
if (!tx.IsCoinBase())
{
uint256 hash = tx.GetHash();
if (!mapTransactions.count(hash) && !txdb.ContainsTx(hash))
tx.AcceptTransaction(txdb, fCheckInputs);
}
}
if (!IsCoinBase())
return AcceptTransaction(txdb, fCheckInputs);
}
return true;
}
void ReacceptWalletTransactions()
{
// Reaccept any txes of ours that aren't already in a block
CTxDB txdb("r");
CRITICAL_BLOCK(cs_mapWallet)
{
foreach(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
{
CWalletTx& wtx = item.second;
if (!wtx.IsCoinBase() && !txdb.ContainsTx(wtx.GetHash()))
wtx.AcceptWalletTransaction(txdb, false);
}
}
}
void CWalletTx::RelayWalletTransaction(CTxDB& txdb)
{
foreach(const CMerkleTx& tx, vtxPrev)
{
if (!tx.IsCoinBase())
{
uint256 hash = tx.GetHash();
if (!txdb.ContainsTx(hash))
RelayMessage(CInv(MSG_TX, hash), (CTransaction)tx);
}
}
if (!IsCoinBase())
{
uint256 hash = GetHash();
if (!txdb.ContainsTx(hash))
{
printf("Relaying wtx %s\n", hash.ToString().substr(0,6).c_str());
RelayMessage(CInv(MSG_TX, hash), (CTransaction)*this);
}
}
}
void RelayWalletTransactions()
{
static int64 nLastTime;
if (GetTime() - nLastTime < 10 * 60)
return;
nLastTime = GetTime();
// Rebroadcast any of our txes that aren't in a block yet
printf("RelayWalletTransactions()\n");
CTxDB txdb("r");
CRITICAL_BLOCK(cs_mapWallet)
{
// Sort them in chronological order
multimap<unsigned int, CWalletTx*> mapSorted;
foreach(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
{
CWalletTx& wtx = item.second;
mapSorted.insert(make_pair(wtx.nTimeReceived, &wtx));
}
foreach(PAIRTYPE(const unsigned int, CWalletTx*)& item, mapSorted)
{
CWalletTx& wtx = *item.second;
wtx.RelayWalletTransaction(txdb);
}
}
}
//////////////////////////////////////////////////////////////////////////////
//
// CBlock and CBlockIndex
//
bool CBlock::ReadFromDisk(const CBlockIndex* pblockindex, bool fReadTransactions)
{
return ReadFromDisk(pblockindex->nFile, pblockindex->nBlockPos, fReadTransactions);
}
uint256 GetOrphanRoot(const CBlock* pblock)
{
// Work back to the first block in the orphan chain
while (mapOrphanBlocks.count(pblock->hashPrevBlock))
pblock = mapOrphanBlocks[pblock->hashPrevBlock];
return pblock->GetHash();
}
int64 CBlock::GetBlockValue(int64 nFees) const
{
int64 nSubsidy = 50 * COIN;
// Subsidy is cut in half every 4 years
nSubsidy >>= (nBestHeight / 210000);
return nSubsidy + nFees;
}
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast)
{
const unsigned int nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
const unsigned int nTargetSpacing = 10 * 60;
const unsigned int nInterval = nTargetTimespan / nTargetSpacing;
// Genesis block
if (pindexLast == NULL)
return bnProofOfWorkLimit.GetCompact();
// Only change once per interval
if ((pindexLast->nHeight+1) % nInterval != 0)
return pindexLast->nBits;
// Go back by what we want to be 14 days worth of blocks
const CBlockIndex* pindexFirst = pindexLast;
for (int i = 0; pindexFirst && i < nInterval-1; i++)
pindexFirst = pindexFirst->pprev;
assert(pindexFirst);
// Limit adjustment step
unsigned int nActualTimespan = pindexLast->nTime - pindexFirst->nTime;
printf(" nActualTimespan = %d before bounds\n", nActualTimespan);
if (nActualTimespan < nTargetTimespan/4)
nActualTimespan = nTargetTimespan/4;
if (nActualTimespan > nTargetTimespan*4)
nActualTimespan = nTargetTimespan*4;
// Retarget
CBigNum bnNew;
bnNew.SetCompact(pindexLast->nBits);
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
if (bnNew > bnProofOfWorkLimit)
bnNew = bnProofOfWorkLimit;
/// debug print
printf("\n\n\nGetNextWorkRequired RETARGET *****\n");
printf("nTargetTimespan = %d nActualTimespan = %d\n", nTargetTimespan, nActualTimespan);
printf("Before: %08x %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString().c_str());
printf("After: %08x %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString().c_str());
return bnNew.GetCompact();
}
bool CTransaction::DisconnectInputs(CTxDB& txdb)
{
// Relinquish previous transactions' spent pointers
if (!IsCoinBase())
{
foreach(const CTxIn& txin, vin)
{
COutPoint prevout = txin.prevout;
// Get prev txindex from disk
CTxIndex txindex;
if (!txdb.ReadTxIndex(prevout.hash, txindex))
return error("DisconnectInputs() : ReadTxIndex failed");
if (prevout.n >= txindex.vSpent.size())
return error("DisconnectInputs() : prevout.n out of range");
// Mark outpoint as not spent
txindex.vSpent[prevout.n].SetNull();
// Write back
txdb.UpdateTxIndex(prevout.hash, txindex);
}
}
// Remove transaction from index
if (!txdb.EraseTxIndex(*this))
return error("DisconnectInputs() : EraseTxPos failed");
return true;
}
bool CTransaction::ConnectInputs(CTxDB& txdb, map<uint256, CTxIndex>& mapTestPool, CDiskTxPos posThisTx, int nHeight, int64& nFees, bool fBlock, bool fMiner, int64 nMinFee)
{
// Take over previous transactions' spent pointers
if (!IsCoinBase())
{
int64 nValueIn = 0;
for (int i = 0; i < vin.size(); i++)
{
COutPoint prevout = vin[i].prevout;
// Read txindex
CTxIndex txindex;
bool fFound = true;
if (fMiner && mapTestPool.count(prevout.hash))
{
// Get txindex from current proposed changes
txindex = mapTestPool[prevout.hash];
}
else
{
// Read txindex from txdb
fFound = txdb.ReadTxIndex(prevout.hash, txindex);
}
if (!fFound && (fBlock || fMiner))
return fMiner ? false : error("ConnectInputs() : %s prev tx %s index entry not found", GetHash().ToString().substr(0,6).c_str(), prevout.hash.ToString().substr(0,6).c_str());
// Read txPrev
CTransaction txPrev;
if (!fFound || txindex.pos == CDiskTxPos(1,1,1))
{
// Get prev tx from single transactions in memory
CRITICAL_BLOCK(cs_mapTransactions)
{
if (!mapTransactions.count(prevout.hash))
return error("ConnectInputs() : %s mapTransactions prev not found %s", GetHash().ToString().substr(0,6).c_str(), prevout.hash.ToString().substr(0,6).c_str());
txPrev = mapTransactions[prevout.hash];
}
if (!fFound)
txindex.vSpent.resize(txPrev.vout.size());
}
else
{
// Get prev tx from disk
if (!txPrev.ReadFromDisk(txindex.pos))
return error("ConnectInputs() : %s ReadFromDisk prev tx %s failed", GetHash().ToString().substr(0,6).c_str(), prevout.hash.ToString().substr(0,6).c_str());
}
if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
return error("ConnectInputs() : %s prevout.n out of range %d %d %d", GetHash().ToString().substr(0,6).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size());
// If prev is coinbase, check that it's matured
if (txPrev.IsCoinBase())
for (CBlockIndex* pindex = pindexBest; pindex && nBestHeight - pindex->nHeight < COINBASE_MATURITY-1; pindex = pindex->pprev)
if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
return error("ConnectInputs() : tried to spend coinbase at depth %d", nBestHeight - pindex->nHeight);
// Verify signature
if (!VerifySignature(txPrev, *this, i))
return error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,6).c_str());
// Check for conflicts
if (!txindex.vSpent[prevout.n].IsNull())
return fMiner ? false : error("ConnectInputs() : %s prev tx already used at %s", GetHash().ToString().substr(0,6).c_str(), txindex.vSpent[prevout.n].ToString().c_str());
// Mark outpoints as spent
txindex.vSpent[prevout.n] = posThisTx;
// Write back
if (fBlock)
txdb.UpdateTxIndex(prevout.hash, txindex);
else if (fMiner)
mapTestPool[prevout.hash] = txindex;
nValueIn += txPrev.vout[prevout.n].nValue;
}
// Tally transaction fees
int64 nTxFee = nValueIn - GetValueOut();
if (nTxFee < 0)
return error("ConnectInputs() : %s nTxFee < 0", GetHash().ToString().substr(0,6).c_str());
if (nTxFee < nMinFee)
return false;
nFees += nTxFee;
}
if (fBlock)
{
// Add transaction to disk index
if (!txdb.AddTxIndex(*this, posThisTx, nHeight))
return error("ConnectInputs() : AddTxPos failed");
}
else if (fMiner)
{
// Add transaction to test pool
mapTestPool[GetHash()] = CTxIndex(CDiskTxPos(1,1,1), vout.size());
}
return true;
}
bool CTransaction::ClientConnectInputs()
{
if (IsCoinBase())
return false;
// Take over previous transactions' spent pointers
CRITICAL_BLOCK(cs_mapTransactions)
{
int64 nValueIn = 0;
for (int i = 0; i < vin.size(); i++)
{
// Get prev tx from single transactions in memory
COutPoint prevout = vin[i].prevout;
if (!mapTransactions.count(prevout.hash))
return false;
CTransaction& txPrev = mapTransactions[prevout.hash];
if (prevout.n >= txPrev.vout.size())
return false;
// Verify signature
if (!VerifySignature(txPrev, *this, i))
return error("ConnectInputs() : VerifySignature failed");
///// this is redundant with the mapNextTx stuff, not sure which I want to get rid of
///// this has to go away now that posNext is gone
// // Check for conflicts
// if (!txPrev.vout[prevout.n].posNext.IsNull())
// return error("ConnectInputs() : prev tx already used");
//
// // Flag outpoints as used
// txPrev.vout[prevout.n].posNext = posThisTx;
nValueIn += txPrev.vout[prevout.n].nValue;
}
if (GetValueOut() > nValueIn)
return false;
}
return true;
}
bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
{
// Disconnect in reverse order
for (int i = vtx.size()-1; i >= 0; i--)
if (!vtx[i].DisconnectInputs(txdb))
return false;
// Update block index on disk without changing it in memory.
// The memory index structure will be changed after the db commits.
if (pindex->pprev)
{
CDiskBlockIndex blockindexPrev(pindex->pprev);
blockindexPrev.hashNext = 0;
txdb.WriteBlockIndex(blockindexPrev);
}
return true;
}
bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
{
//// issue here: it doesn't know the version
unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK) - 1 + GetSizeOfCompactSize(vtx.size());
map<uint256, CTxIndex> mapUnused;
int64 nFees = 0;
foreach(CTransaction& tx, vtx)
{
CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
nTxPos += ::GetSerializeSize(tx, SER_DISK);
if (!tx.ConnectInputs(txdb, mapUnused, posThisTx, pindex->nHeight, nFees, true, false))
return false;
}
if (vtx[0].GetValueOut() > GetBlockValue(nFees))
return false;
// Update block index on disk without changing it in memory.
// The memory index structure will be changed after the db commits.
if (pindex->pprev)
{
CDiskBlockIndex blockindexPrev(pindex->pprev);
blockindexPrev.hashNext = pindex->GetBlockHash();
txdb.WriteBlockIndex(blockindexPrev);
}
// Watch for transactions paying to me
foreach(CTransaction& tx, vtx)
AddToWalletIfMine(tx, this);
return true;
}
bool Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
{
printf("*** REORGANIZE ***\n");
// Find the fork
CBlockIndex* pfork = pindexBest;
CBlockIndex* plonger = pindexNew;
while (pfork != plonger)
{
if (!(pfork = pfork->pprev))
return error("Reorganize() : pfork->pprev is null");
while (plonger->nHeight > pfork->nHeight)
if (!(plonger = plonger->pprev))
return error("Reorganize() : plonger->pprev is null");
}
// List of what to disconnect
vector<CBlockIndex*> vDisconnect;
for (CBlockIndex* pindex = pindexBest; pindex != pfork; pindex = pindex->pprev)
vDisconnect.push_back(pindex);
// List of what to connect
vector<CBlockIndex*> vConnect;
for (CBlockIndex* pindex = pindexNew; pindex != pfork; pindex = pindex->pprev)
vConnect.push_back(pindex);
reverse(vConnect.begin(), vConnect.end());
// Disconnect shorter branch
vector<CTransaction> vResurrect;
foreach(CBlockIndex* pindex, vDisconnect)
{
CBlock block;
if (!block.ReadFromDisk(pindex->nFile, pindex->nBlockPos, true))
return error("Reorganize() : ReadFromDisk for disconnect failed");
if (!block.DisconnectBlock(txdb, pindex))
return error("Reorganize() : DisconnectBlock failed");
// Queue memory transactions to resurrect
foreach(const CTransaction& tx, block.vtx)
if (!tx.IsCoinBase())
vResurrect.push_back(tx);
}
// Connect longer branch
vector<CTransaction> vDelete;
for (int i = 0; i < vConnect.size(); i++)
{
CBlockIndex* pindex = vConnect[i];
CBlock block;
if (!block.ReadFromDisk(pindex->nFile, pindex->nBlockPos, true))
return error("Reorganize() : ReadFromDisk for connect failed");
if (!block.ConnectBlock(txdb, pindex))
{
// Invalid block, delete the rest of this branch
txdb.TxnAbort();
for (int j = i; j < vConnect.size(); j++)
{
CBlockIndex* pindex = vConnect[j];
pindex->EraseBlockFromDisk();
txdb.EraseBlockIndex(pindex->GetBlockHash());
mapBlockIndex.erase(pindex->GetBlockHash());
delete pindex;
}
return error("Reorganize() : ConnectBlock failed");
}
// Queue memory transactions to delete
foreach(const CTransaction& tx, block.vtx)
vDelete.push_back(tx);
}
if (!txdb.WriteHashBestChain(pindexNew->GetBlockHash()))
return error("Reorganize() : WriteHashBestChain failed");
// Commit now because resurrecting could take some time
txdb.TxnCommit();
// Disconnect shorter branch
foreach(CBlockIndex* pindex, vDisconnect)
if (pindex->pprev)
pindex->pprev->pnext = NULL;
// Connect longer branch
foreach(CBlockIndex* pindex, vConnect)
if (pindex->pprev)
pindex->pprev->pnext = pindex;
// Resurrect memory transactions that were in the disconnected branch
foreach(CTransaction& tx, vResurrect)
tx.AcceptTransaction(txdb, false);
// Delete redundant memory transactions that are in the connected branch
foreach(CTransaction& tx, vDelete)
tx.RemoveFromMemoryPool();
return true;
}
bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
{
// Check for duplicate
uint256 hash = GetHash();
if (mapBlockIndex.count(hash))
return error("AddToBlockIndex() : %s already exists", hash.ToString().substr(0,14).c_str());
// Construct new block index object
CBlockIndex* pindexNew = new CBlockIndex(nFile, nBlockPos, *this);
if (!pindexNew)
return error("AddToBlockIndex() : new CBlockIndex failed");
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
pindexNew->phashBlock = &((*mi).first);
map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(hashPrevBlock);
if (miPrev != mapBlockIndex.end())
{
pindexNew->pprev = (*miPrev).second;
pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
}
CTxDB txdb;
txdb.TxnBegin();
txdb.WriteBlockIndex(CDiskBlockIndex(pindexNew));
// New best
if (pindexNew->nHeight > nBestHeight)
{
if (pindexGenesisBlock == NULL && hash == hashGenesisBlock)
{
pindexGenesisBlock = pindexNew;
txdb.WriteHashBestChain(hash);
}
else if (hashPrevBlock == hashBestChain)
{
// Adding to current best branch
if (!ConnectBlock(txdb, pindexNew) || !txdb.WriteHashBestChain(hash))
{
txdb.TxnAbort();
pindexNew->EraseBlockFromDisk();
mapBlockIndex.erase(pindexNew->GetBlockHash());
delete pindexNew;
return error("AddToBlockIndex() : ConnectBlock failed");
}
txdb.TxnCommit();
pindexNew->pprev->pnext = pindexNew;
// Delete redundant memory transactions
foreach(CTransaction& tx, vtx)
tx.RemoveFromMemoryPool();
}
else
{
// New best branch
if (!Reorganize(txdb, pindexNew))
{
txdb.TxnAbort();
return error("AddToBlockIndex() : Reorganize failed");
}
}
// New best link
hashBestChain = hash;
pindexBest = pindexNew;
nBestHeight = pindexBest->nHeight;
nTransactionsUpdated++;
printf("AddToBlockIndex: new best=%s height=%d\n", hashBestChain.ToString().substr(0,14).c_str(), nBestHeight);
}
txdb.TxnCommit();
txdb.Close();
if (pindexNew == pindexBest)
{
// Relay wallet transactions that haven't gotten in yet
RelayWalletTransactions();
// Notify UI to display prev block's coinbase if it was ours
static uint256 hashPrevBestCoinBase;
CRITICAL_BLOCK(cs_mapWallet)
vWalletUpdated.push_back(hashPrevBestCoinBase);
hashPrevBestCoinBase = vtx[0].GetHash();
}
MainFrameRepaint();
return true;
}
bool CBlock::CheckBlock() const
{
// These are checks that are independent of context
// that can be verified before saving an orphan block.
// Size limits
if (vtx.empty() || vtx.size() > MAX_SIZE || ::GetSerializeSize(*this, SER_DISK) > MAX_SIZE)
return error("CheckBlock() : size limits failed");
// Check timestamp
if (nTime > GetAdjustedTime() + 2 * 60 * 60)
return error("CheckBlock() : block timestamp too far in the future");
// First transaction must be coinbase, the rest must not be
if (vtx.empty() || !vtx[0].IsCoinBase())
return error("CheckBlock() : first tx is not coinbase");
for (int i = 1; i < vtx.size(); i++)
if (vtx[i].IsCoinBase())
return error("CheckBlock() : more than one coinbase");
// Check transactions
foreach(const CTransaction& tx, vtx)
if (!tx.CheckTransaction())
return error("CheckBlock() : CheckTransaction failed");
// Check proof of work matches claimed amount
if (CBigNum().SetCompact(nBits) > bnProofOfWorkLimit)
return error("CheckBlock() : nBits below minimum work");
if (GetHash() > CBigNum().SetCompact(nBits).getuint256())
return error("CheckBlock() : hash doesn't match nBits");
// Check merkleroot
if (hashMerkleRoot != BuildMerkleTree())
return error("CheckBlock() : hashMerkleRoot mismatch");
return true;
}
bool CBlock::AcceptBlock()
{
// Check for duplicate
uint256 hash = GetHash();
if (mapBlockIndex.count(hash))
return error("AcceptBlock() : block already in mapBlockIndex");
// Get prev block index
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
if (mi == mapBlockIndex.end())
return error("AcceptBlock() : prev block not found");
CBlockIndex* pindexPrev = (*mi).second;
// Check timestamp against prev
if (nTime <= pindexPrev->GetMedianTimePast())
return error("AcceptBlock() : block's timestamp is too early");
// Check that all transactions are finalized (starting around 30 Nov 2009)
if (nBestHeight > 31000) // 25620 + 5320
foreach(const CTransaction& tx, vtx)
if (!tx.IsFinal(nTime))
return error("AcceptBlock() : contains a non-final transaction");
// Check proof of work
if (nBits != GetNextWorkRequired(pindexPrev))
return error("AcceptBlock() : incorrect proof of work");
// Write block to history file
if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK)))
return error("AcceptBlock() : out of disk space");
unsigned int nFile;
unsigned int nBlockPos;
if (!WriteToDisk(!fClient, nFile, nBlockPos))
return error("AcceptBlock() : WriteToDisk failed");
if (!AddToBlockIndex(nFile, nBlockPos))
return error("AcceptBlock() : AddToBlockIndex failed");
if (hashBestChain == hash)
RelayInventory(CInv(MSG_BLOCK, hash));
// // Add atoms to user reviews for coins created
// vector<unsigned char> vchPubKey;
// if (ExtractPubKey(vtx[0].vout[0].scriptPubKey, false, vchPubKey))
// {
// unsigned short nAtom = GetRand(USHRT_MAX - 100) + 100;
// vector<unsigned short> vAtoms(1, nAtom);
// AddAtomsAndPropagate(Hash(vchPubKey.begin(), vchPubKey.end()), vAtoms, true);
// }
return true;
}
bool ProcessBlock(CNode* pfrom, CBlock* pblock)
{
// Check for duplicate
uint256 hash = pblock->GetHash();
if (mapBlockIndex.count(hash))
return error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString().substr(0,14).c_str());
if (mapOrphanBlocks.count(hash))
return error("ProcessBlock() : already have block (orphan) %s", hash.ToString().substr(0,14).c_str());
// Preliminary checks
if (!pblock->CheckBlock())
{
delete pblock;
return error("ProcessBlock() : CheckBlock FAILED");
}
// If don't already have its previous block, shunt it off to holding area until we get it
if (!mapBlockIndex.count(pblock->hashPrevBlock))
{
printf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString().substr(0,14).c_str());
mapOrphanBlocks.insert(make_pair(hash, pblock));
mapOrphanBlocksByPrev.insert(make_pair(pblock->hashPrevBlock, pblock));
// Ask this guy to fill in what we're missing
if (pfrom)
pfrom->PushMessage("getblocks", CBlockLocator(pindexBest), GetOrphanRoot(pblock));
return true;
}
// Store to disk
if (!pblock->AcceptBlock())
{
delete pblock;
return error("ProcessBlock() : AcceptBlock FAILED");
}
delete pblock;
// Recursively process any orphan blocks that depended on this one
vector<uint256> vWorkQueue;
vWorkQueue.push_back(hash);
for (int i = 0; i < vWorkQueue.size(); i++)
{
uint256 hashPrev = vWorkQueue[i];
for (multimap<uint256, CBlock*>::iterator mi = mapOrphanBlocksByPrev.lower_bound(hashPrev);
mi != mapOrphanBlocksByPrev.upper_bound(hashPrev);
++mi)
{
CBlock* pblockOrphan = (*mi).second;
if (pblockOrphan->AcceptBlock())
vWorkQueue.push_back(pblockOrphan->GetHash());
mapOrphanBlocks.erase(pblockOrphan->GetHash());
delete pblockOrphan;
}
mapOrphanBlocksByPrev.erase(hashPrev);
}
printf("ProcessBlock: ACCEPTED\n");
return true;
}
template<typename Stream>
bool ScanMessageStart(Stream& s)
{
// Scan ahead to the next pchMessageStart, which should normally be immediately
// at the file pointer. Leaves file pointer at end of pchMessageStart.
s.clear(0);
short prevmask = s.exceptions(0);
const char* p = BEGIN(pchMessageStart);
try
{
loop
{
char c;
s.read(&c, 1);
if (s.fail())
{
s.clear(0);
s.exceptions(prevmask);
return false;
}
if (*p != c)
p = BEGIN(pchMessageStart);
if (*p == c)
{
if (++p == END(pchMessageStart))
{
s.clear(0);
s.exceptions(prevmask);
return true;
}
}
}
}
catch (...)
{
s.clear(0);
s.exceptions(prevmask);
return false;
}
}
string GetAppDir()
{
string strDir;
if (!strSetDataDir.empty())
{
strDir = strSetDataDir;
}
else if (getenv("APPDATA"))
{
strDir = strprintf("%s\\Bitcoin", getenv("APPDATA"));
}
else if (getenv("USERPROFILE"))
{
string strAppData = strprintf("%s\\Application Data", getenv("USERPROFILE"));
static bool fMkdirDone;
if (!fMkdirDone)
{
fMkdirDone = true;
_mkdir(strAppData.c_str());
}
strDir = strprintf("%s\\Bitcoin", strAppData.c_str());
}
else
{
return ".";
}
static bool fMkdirDone;
if (!fMkdirDone)
{
fMkdirDone = true;
_mkdir(strDir.c_str());
}
return strDir;
}
bool CheckDiskSpace(int64 nAdditionalBytes)
{
wxLongLong nFreeBytesAvailable = 0;
if (!wxGetDiskSpace(wxStandardPaths::Get().GetDataDir(), NULL, &nFreeBytesAvailable))
{
printf("ERROR: wxGetDiskSpace() failed\n");
return true;
}
// Check for 15MB because database could create another 10MB log file at any time
if (nFreeBytesAvailable < (int64)15000000 + nAdditionalBytes)
{
fShutdown = true;
wxMessageBox("Warning: Your disk space is low ", "Bitcoin", wxICON_EXCLAMATION);
_beginthread(Shutdown, 0, NULL);
return false;
}
return true;
}
FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode)
{
if (nFile == -1)
return NULL;
FILE* file = fopen(strprintf("%s\\blk%04d.dat", GetAppDir().c_str(), nFile).c_str(), pszMode);
if (!file)
return NULL;
if (nBlockPos != 0 && !strchr(pszMode, 'a') && !strchr(pszMode, 'w'))
{
if (fseek(file, nBlockPos, SEEK_SET) != 0)
{
fclose(file);
return NULL;
}
}
return file;
}
static unsigned int nCurrentBlockFile = 1;
FILE* AppendBlockFile(unsigned int& nFileRet)
{
nFileRet = 0;
loop
{
FILE* file = OpenBlockFile(nCurrentBlockFile, 0, "ab");
if (!file)
return NULL;
if (fseek(file, 0, SEEK_END) != 0)
return NULL;
// FAT32 filesize max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
if (ftell(file) < 0x7F000000 - MAX_SIZE)
{
nFileRet = nCurrentBlockFile;
return file;
}
fclose(file);
nCurrentBlockFile++;
}
}
bool LoadBlockIndex(bool fAllowNew)
{
//
// Load block index
//
CTxDB txdb("cr");
if (!txdb.LoadBlockIndex())
return false;
txdb.Close();
//
// Init with genesis block
//
if (mapBlockIndex.empty())
{
if (!fAllowNew)
return false;
// Genesis Block:
// GetHash() = 0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
// hashMerkleRoot = 0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b
// txNew.vin[0].scriptSig = 486604799 4 0x736B6E616220726F662074756F6C69616220646E6F63657320666F206B6E697262206E6F20726F6C6C65636E61684320393030322F6E614A2F33302073656D695420656854
// txNew.vout[0].nValue = 5000000000
// txNew.vout[0].scriptPubKey = 0x5F1DF16B2B704C8A578D0BBAF74D385CDE12C11EE50455F3C438EF4C3FBCF649B6DE611FEAE06279A60939E028A8D65C10B73071A6F16719274855FEB0FD8A6704 OP_CHECKSIG
// block.nVersion = 1
// block.nTime = 1231006505
// block.nBits = 0x1d00ffff
// block.nNonce = 2083236893
// CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
// CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
// CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
// CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
// vMerkleTree: 4a5e1e
// Genesis block
char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
CTransaction txNew;
txNew.vin.resize(1);
txNew.vout.resize(1);
txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(4) << vector<unsigned char>((unsigned char*)pszTimestamp, (unsigned char*)pszTimestamp + strlen(pszTimestamp));
txNew.vout[0].nValue = 50 * COIN;
txNew.vout[0].scriptPubKey = CScript() << CBigNum("0x5F1DF16B2B704C8A578D0BBAF74D385CDE12C11EE50455F3C438EF4C3FBCF649B6DE611FEAE06279A60939E028A8D65C10B73071A6F16719274855FEB0FD8A6704") << OP_CHECKSIG;
CBlock block;
block.vtx.push_back(txNew);
block.hashPrevBlock = 0;
block.hashMerkleRoot = block.BuildMerkleTree();
block.nVersion = 1;
block.nTime = 1231006505;
block.nBits = 0x1d00ffff;
block.nNonce = 2083236893;
//// debug print, delete this later
printf("%s\n", block.GetHash().ToString().c_str());
printf("%s\n", block.hashMerkleRoot.ToString().c_str());
printf("%s\n", hashGenesisBlock.ToString().c_str());
txNew.vout[0].scriptPubKey.print();
block.print();
assert(block.hashMerkleRoot == uint256("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
assert(block.GetHash() == hashGenesisBlock);
// Start new block file
unsigned int nFile;
unsigned int nBlockPos;
if (!block.WriteToDisk(!fClient, nFile, nBlockPos))
return error("LoadBlockIndex() : writing genesis block to disk failed");
if (!block.AddToBlockIndex(nFile, nBlockPos))
return error("LoadBlockIndex() : genesis block not accepted");
}
return true;
}
void PrintBlockTree()
{
// precompute tree structure
map<CBlockIndex*, vector<CBlockIndex*> > mapNext;
for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
{
CBlockIndex* pindex = (*mi).second;
mapNext[pindex->pprev].push_back(pindex);
// test
//while (rand() % 3 == 0)
// mapNext[pindex->pprev].push_back(pindex);
}
vector<pair<int, CBlockIndex*> > vStack;
vStack.push_back(make_pair(0, pindexGenesisBlock));
int nPrevCol = 0;
while (!vStack.empty())
{
int nCol = vStack.back().first;
CBlockIndex* pindex = vStack.back().second;
vStack.pop_back();
// print split or gap
if (nCol > nPrevCol)
{
for (int i = 0; i < nCol-1; i++)
printf("| ");
printf("|\\\n");
}
else if (nCol < nPrevCol)
{
for (int i = 0; i < nCol; i++)
printf("| ");
printf("|\n");
}
nPrevCol = nCol;
// print columns
for (int i = 0; i < nCol; i++)
printf("| ");
// print item
CBlock block;
block.ReadFromDisk(pindex, true);
printf("%d (%u,%u) %s %s tx %d",
pindex->nHeight,
pindex->nFile,
pindex->nBlockPos,
block.GetHash().ToString().substr(0,14).c_str(),
DateTimeStr(block.nTime).c_str(),
block.vtx.size());
CRITICAL_BLOCK(cs_mapWallet)
{
if (mapWallet.count(block.vtx[0].GetHash()))
{
CWalletTx& wtx = mapWallet[block.vtx[0].GetHash()];
printf(" mine: %d %d %d", wtx.GetDepthInMainChain(), wtx.GetBlocksToMaturity(), wtx.GetCredit());
}
}
printf("\n");
// put the main timechain first
vector<CBlockIndex*>& vNext = mapNext[pindex];
for (int i = 0; i < vNext.size(); i++)
{
if (vNext[i]->pnext)
{
swap(vNext[0], vNext[i]);
break;
}
}
// iterate children
for (int i = 0; i < vNext.size(); i++)
vStack.push_back(make_pair(nCol+i, vNext[i]));
}
}
//////////////////////////////////////////////////////////////////////////////
//
// Messages
//
bool AlreadyHave(CTxDB& txdb, const CInv& inv)
{
switch (inv.type)
{
case MSG_TX: return mapTransactions.count(inv.hash) || txdb.ContainsTx(inv.hash);
case MSG_BLOCK: return mapBlockIndex.count(inv.hash) || mapOrphanBlocks.count(inv.hash);
case MSG_REVIEW: return true;
case MSG_PRODUCT: return mapProducts.count(inv.hash);
}
// Don't know what it is, just say we already got one
return true;
}
bool ProcessMessages(CNode* pfrom)
{
CDataStream& vRecv = pfrom->vRecv;
if (vRecv.empty())
return true;
//printf("ProcessMessages(%d bytes)\n", vRecv.size());
//
// Message format
// (4) message start
// (12) command
// (4) size
// (x) data
//
loop
{
// Scan for message start
CDataStream::iterator pstart = search(vRecv.begin(), vRecv.end(), BEGIN(pchMessageStart), END(pchMessageStart));
if (vRecv.end() - pstart < sizeof(CMessageHeader))
{
if (vRecv.size() > sizeof(CMessageHeader))
{
printf("\n\nPROCESSMESSAGE MESSAGESTART NOT FOUND\n\n");
vRecv.erase(vRecv.begin(), vRecv.end() - sizeof(CMessageHeader));
}
break;
}
if (pstart - vRecv.begin() > 0)
printf("\n\nPROCESSMESSAGE SKIPPED %d BYTES\n\n", pstart - vRecv.begin());
vRecv.erase(vRecv.begin(), pstart);
// Read header
CMessageHeader hdr;
vRecv >> hdr;
if (!hdr.IsValid())
{
printf("\n\nPROCESSMESSAGE: ERRORS IN HEADER %s\n\n\n", hdr.GetCommand().c_str());
continue;
}
string strCommand = hdr.GetCommand();
// Message size
unsigned int nMessageSize = hdr.nMessageSize;
if (nMessageSize > vRecv.size())
{
// Rewind and wait for rest of message
///// need a mechanism to give up waiting for overlong message size error
//printf("message-break\n");
vRecv.insert(vRecv.begin(), BEGIN(hdr), END(hdr));
Sleep(100);
break;
}
// Copy message to its own buffer
CDataStream vMsg(vRecv.begin(), vRecv.begin() + nMessageSize, vRecv.nType, vRecv.nVersion);
vRecv.ignore(nMessageSize);
// Process message
bool fRet = false;
try
{
CheckForShutdown(2);
CRITICAL_BLOCK(cs_main)
fRet = ProcessMessage(pfrom, strCommand, vMsg);
CheckForShutdown(2);
}
catch (std::ios_base::failure& e) {
if (strstr(e.what(), "CDataStream::read() : end of data"))
{
// Allow exceptions from underlength message on vRecv
LogException(&e, "ProcessMessage()");
}
else
PrintException(&e, "ProcessMessage()");
} catch (std::exception& e) {
PrintException(&e, "ProcessMessage()");
} catch (...) {
PrintException(NULL, "ProcessMessage()");
}
if (!fRet)
printf("ProcessMessage(%s, %d bytes) FAILED\n", strCommand.c_str(), nMessageSize);
}
vRecv.Compact();
return true;
}
bool ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
{
static map<unsigned int, vector<unsigned char> > mapReuseKey;
RandAddSeedPerfmon();
printf("received: %s (%d bytes)\n", strCommand.c_str(), vRecv.size());
if (nDropMessagesTest > 0 && GetRand(nDropMessagesTest) == 0)
{
printf("dropmessages DROPPING RECV MESSAGE\n");
return true;
}
if (strCommand == "version")
{
// Each connection can only send one version message
if (pfrom->nVersion != 0)
return false;
int64 nTime;
CAddress addrMe;
CAddress addrFrom;
uint64 nNonce = 1;
vRecv >> pfrom->nVersion >> pfrom->nServices >> nTime >> addrMe;
if (pfrom->nVersion >= 106 && !vRecv.empty())
vRecv >> addrFrom >> nNonce;
if (pfrom->nVersion == 0)
return false;
// Disconnect if we connected to ourself
if (nNonce == nLocalHostNonce)
{
pfrom->fDisconnect = true;
pfrom->vRecv.clear();
pfrom->vSend.clear();
return true;
}
pfrom->vSend.SetVersion(min(pfrom->nVersion, VERSION));
pfrom->vRecv.SetVersion(min(pfrom->nVersion, VERSION));
pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
if (pfrom->fClient)
{
pfrom->vSend.nType |= SER_BLOCKHEADERONLY;
pfrom->vRecv.nType |= SER_BLOCKHEADERONLY;
}
AddTimeData(pfrom->addr.ip, nTime);
// Ask the first connected node for block updates
static bool fAskedForBlocks;
if (!fAskedForBlocks && !pfrom->fClient)
{
fAskedForBlocks = true;
pfrom->PushMessage("getblocks", CBlockLocator(pindexBest), uint256(0));
}
pfrom->fSuccessfullyConnected = true;
printf("version message: version %d\n", pfrom->nVersion);
}
else if (pfrom->nVersion == 0)
{
// Must have a version message before anything else
return false;
}
else if (strCommand == "addr")
{
vector<CAddress> vAddr;
vRecv >> vAddr;
// Clear addrknown lists periodically to allow refresh broadcasts
static int64 nLastClearedAddrKnown;
if (nLastClearedAddrKnown < GetAdjustedTime() - 24 * 60 * 60)
{
nLastClearedAddrKnown = GetAdjustedTime();
CRITICAL_BLOCK(cs_vNodes)
foreach(CNode* pnode, vNodes)
pnode->setAddrKnown.clear();
}
// Store the new addresses
CAddrDB addrdb;
foreach(const CAddress& addr, vAddr)
{
if (fShutdown)
return true;
AddAddress(addrdb, addr);
pfrom->AddAddressKnown(addr);
if (!pfrom->fGetAddr && addr.IsRoutable())
{
// Put on lists to send to other nodes
CRITICAL_BLOCK(cs_vNodes)
foreach(CNode* pnode, vNodes)
pnode->PushAddress(addr);
}
}
pfrom->fGetAddr = false;
}
else if (strCommand == "inv")
{
vector<CInv> vInv;
vRecv >> vInv;
CTxDB txdb("r");
foreach(const CInv& inv, vInv)
{
if (fShutdown)
return true;
pfrom->AddInventoryKnown(inv);
bool fAlreadyHave = AlreadyHave(txdb, inv);
printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
if (!fAlreadyHave)
pfrom->AskFor(inv);
else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash))
pfrom->PushMessage("getblocks", CBlockLocator(pindexBest), GetOrphanRoot(mapOrphanBlocks[inv.hash]));
}
}
else if (strCommand == "getdata")
{
vector<CInv> vInv;
vRecv >> vInv;
foreach(const CInv& inv, vInv)
{
if (fShutdown)
return true;
printf("received getdata for: %s\n", inv.ToString().c_str());
if (inv.type == MSG_BLOCK)
{
// Send block from disk
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash);
if (mi != mapBlockIndex.end())
{
//// could optimize this to send header straight from blockindex for client
CBlock block;
block.ReadFromDisk((*mi).second, !pfrom->fClient);
pfrom->PushMessage("block", block);
}
}
else if (inv.IsKnownType())
{
// Send stream from relay memory
CRITICAL_BLOCK(cs_mapRelay)
{
map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
if (mi != mapRelay.end())
pfrom->PushMessage(inv.GetCommand(), (*mi).second);
}
}
}
}
else if (strCommand == "getblocks")
{
CBlockLocator locator;
uint256 hashStop;
vRecv >> locator >> hashStop;
// Find the first block the caller has in the main chain
CBlockIndex* pindex = locator.GetBlockIndex();
// Send the rest of the chain
if (pindex)
pindex = pindex->pnext;
printf("getblocks %d to %s\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,14).c_str());
for (; pindex; pindex = pindex->pnext)
{
if (pindex->GetBlockHash() == hashStop)
{
printf(" getblocks stopping at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,14).c_str());
break;
}
// Bypass setInventoryKnown in case an inventory message got lost
CRITICAL_BLOCK(pfrom->cs_inventory)
{
CInv inv(MSG_BLOCK, pindex->GetBlockHash());
// returns true if wasn't already contained in the set
if (pfrom->setInventoryKnown2.insert(inv).second)
{
pfrom->setInventoryKnown.erase(inv);
pfrom->vInventoryToSend.push_back(inv);
}
}
}
}
else if (strCommand == "tx")
{
vector<uint256> vWorkQueue;
CDataStream vMsg(vRecv);
CTransaction tx;
vRecv >> tx;
CInv inv(MSG_TX, tx.GetHash());
pfrom->AddInventoryKnown(inv);
bool fMissingInputs = false;
if (tx.AcceptTransaction(true, &fMissingInputs))
{
AddToWalletIfMine(tx, NULL);
RelayMessage(inv, vMsg);
mapAlreadyAskedFor.erase(inv);
vWorkQueue.push_back(inv.hash);
// Recursively process any orphan transactions that depended on this one
for (int i = 0; i < vWorkQueue.size(); i++)
{
uint256 hashPrev = vWorkQueue[i];
for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(hashPrev);
mi != mapOrphanTransactionsByPrev.upper_bound(hashPrev);
++mi)
{
const CDataStream& vMsg = *((*mi).second);
CTransaction tx;
CDataStream(vMsg) >> tx;
CInv inv(MSG_TX, tx.GetHash());
if (tx.AcceptTransaction(true))
{
printf(" accepted orphan tx %s\n", inv.hash.ToString().substr(0,6).c_str());
AddToWalletIfMine(tx, NULL);
RelayMessage(inv, vMsg);
mapAlreadyAskedFor.erase(inv);
vWorkQueue.push_back(inv.hash);
}
}
}
foreach(uint256 hash, vWorkQueue)
EraseOrphanTx(hash);
}
else if (fMissingInputs)
{
printf("storing orphan tx %s\n", inv.hash.ToString().substr(0,6).c_str());
AddOrphanTx(vMsg);
}
}
else if (strCommand == "review")
{
CDataStream vMsg(vRecv);
CReview review;
vRecv >> review;
CInv inv(MSG_REVIEW, review.GetHash());
pfrom->AddInventoryKnown(inv);
if (review.AcceptReview())
{
// Relay the original message as-is in case it's a higher version than we know how to parse
RelayMessage(inv, vMsg);
mapAlreadyAskedFor.erase(inv);
}
}
else if (strCommand == "block")
{
auto_ptr<CBlock> pblock(new CBlock);
vRecv >> *pblock;
//// debug print
printf("received block:\n"); pblock->print();
CInv inv(MSG_BLOCK, pblock->GetHash());
pfrom->AddInventoryKnown(inv);
if (ProcessBlock(pfrom, pblock.release()))
mapAlreadyAskedFor.erase(inv);
}
else if (strCommand == "getaddr")
{
pfrom->vAddrToSend.clear();
int64 nSince = GetAdjustedTime() - 5 * 24 * 60 * 60; // in the last 5 days
CRITICAL_BLOCK(cs_mapAddresses)
{
unsigned int nSize = mapAddresses.size();
foreach(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
{
if (fShutdown)
return true;
const CAddress& addr = item.second;
if (addr.nTime > nSince)
pfrom->PushAddress(addr);
}
}
}
else if (strCommand == "checkorder")
{
uint256 hashReply;
CWalletTx order;
vRecv >> hashReply >> order;
/// we have a chance to check the order here
// Keep giving the same key to the same ip until they use it
if (!mapReuseKey.count(pfrom->addr.ip))
mapReuseKey[pfrom->addr.ip] = GenerateNewKey();
// Send back approval of order and pubkey to use
CScript scriptPubKey;
scriptPubKey << mapReuseKey[pfrom->addr.ip] << OP_CHECKSIG;
pfrom->PushMessage("reply", hashReply, (int)0, scriptPubKey);
}
else if (strCommand == "submitorder")
{
uint256 hashReply;
CWalletTx wtxNew;
vRecv >> hashReply >> wtxNew;
// Broadcast
if (!wtxNew.AcceptWalletTransaction())
{
pfrom->PushMessage("reply", hashReply, (int)1);
return error("submitorder AcceptWalletTransaction() failed, returning error 1");
}
wtxNew.fTimeReceivedIsTxTime = true;
AddToWallet(wtxNew);
wtxNew.RelayWalletTransaction();
mapReuseKey.erase(pfrom->addr.ip);
// Send back confirmation
pfrom->PushMessage("reply", hashReply, (int)0);
}
else if (strCommand == "reply")
{
uint256 hashReply;
vRecv >> hashReply;
CRequestTracker tracker;
CRITICAL_BLOCK(pfrom->cs_mapRequests)
{
map<uint256, CRequestTracker>::iterator mi = pfrom->mapRequests.find(hashReply);
if (mi != pfrom->mapRequests.end())
{
tracker = (*mi).second;
pfrom->mapRequests.erase(mi);
}
}
if (!tracker.IsNull())
tracker.fn(tracker.param1, vRecv);
}
else
{
// Ignore unknown commands for extensibility
}
return true;
}
bool SendMessages(CNode* pto)
{
CheckForShutdown(2);
CRITICAL_BLOCK(cs_main)
{
// Don't send anything until we get their version message
if (pto->nVersion == 0)
return true;
//
// Message: addr
//
vector<CAddress> vAddrToSend;
vAddrToSend.reserve(pto->vAddrToSend.size());
foreach(const CAddress& addr, pto->vAddrToSend)
{
// returns true if wasn't already contained in the set
if (pto->setAddrKnown.insert(addr).second)
vAddrToSend.push_back(addr);
}
pto->vAddrToSend.clear();
if (!vAddrToSend.empty())
pto->PushMessage("addr", vAddrToSend);
//
// Message: inventory
//
vector<CInv> vInventoryToSend;
CRITICAL_BLOCK(pto->cs_inventory)
{
vInventoryToSend.reserve(pto->vInventoryToSend.size());
foreach(const CInv& inv, pto->vInventoryToSend)
{
// returns true if wasn't already contained in the set
if (pto->setInventoryKnown.insert(inv).second)
vInventoryToSend.push_back(inv);
}
pto->vInventoryToSend.clear();
pto->setInventoryKnown2.clear();
}
if (!vInventoryToSend.empty())
pto->PushMessage("inv", vInventoryToSend);
//
// Message: getdata
//
vector<CInv> vAskFor;
int64 nNow = GetTime() * 1000000;
CTxDB txdb("r");
while (!pto->mapAskFor.empty() && (*pto->mapAskFor.begin()).first <= nNow)
{
const CInv& inv = (*pto->mapAskFor.begin()).second;
if (!AlreadyHave(txdb, inv))
{
printf("sending getdata: %s\n", inv.ToString().c_str());
vAskFor.push_back(inv);
}
pto->mapAskFor.erase(pto->mapAskFor.begin());
}
if (!vAskFor.empty())
pto->PushMessage("getdata", vAskFor);
}
return true;
}
//////////////////////////////////////////////////////////////////////////////
//
// BitcoinMiner
//
void GenerateBitcoins(bool fGenerate)
{
if (fGenerateBitcoins != fGenerate)
{
fGenerateBitcoins = fGenerate;
CWalletDB().WriteSetting("fGenerateBitcoins", fGenerateBitcoins);
MainFrameRepaint();
}
if (fGenerateBitcoins)
{
int nProcessors = atoi(getenv("NUMBER_OF_PROCESSORS"));
printf("%d processors\n", nProcessors);
if (nProcessors < 1)
nProcessors = 1;
if (fLimitProcessors && nProcessors > nLimitProcessors)
nProcessors = nLimitProcessors;
int nAddThreads = nProcessors - vnThreadsRunning[3];
printf("Starting %d BitcoinMiner threads\n", nAddThreads);
for (int i = 0; i < nAddThreads; i++)
if (_beginthread(ThreadBitcoinMiner, 0, NULL) == -1)
printf("Error: _beginthread(ThreadBitcoinMiner) failed\n");
}
}
void ThreadBitcoinMiner(void* parg)
{
vnThreadsRunning[3]++;
CheckForShutdown(3);
try
{
bool fRet = BitcoinMiner();
printf("BitcoinMiner returned %s\n", fRet ? "true" : "false");
vnThreadsRunning[3]--;
}
catch (std::exception& e) {
vnThreadsRunning[3]--;
PrintException(&e, "ThreadBitcoinMiner()");
} catch (...) {
vnThreadsRunning[3]--;
PrintException(NULL, "ThreadBitcoinMiner()");
}
}
int FormatHashBlocks(void* pbuffer, unsigned int len)
{
unsigned char* pdata = (unsigned char*)pbuffer;
unsigned int blocks = 1 + ((len + 8) / 64);
unsigned char* pend = pdata + 64 * blocks;
memset(pdata + len, 0, 64 * blocks - len);
pdata[len] = 0x80;
unsigned int bits = len * 8;
pend[-1] = (bits >> 0) & 0xff;
pend[-2] = (bits >> 8) & 0xff;
pend[-3] = (bits >> 16) & 0xff;
pend[-4] = (bits >> 24) & 0xff;
return blocks;
}
using CryptoPP::ByteReverse;
static int detectlittleendian = 1;
void BlockSHA256(const void* pin, unsigned int nBlocks, void* pout)
{
unsigned int* pinput = (unsigned int*)pin;
unsigned int* pstate = (unsigned int*)pout;
CryptoPP::SHA256::InitState(pstate);
if (*(char*)&detectlittleendian != 0)
{
for (int n = 0; n < nBlocks; n++)
{
unsigned int pbuf[16];
for (int i = 0; i < 16; i++)
pbuf[i] = ByteReverse(pinput[n * 16 + i]);
CryptoPP::SHA256::Transform(pstate, pbuf);
}
for (int i = 0; i < 8; i++)
pstate[i] = ByteReverse(pstate[i]);
}
else
{
for (int n = 0; n < nBlocks; n++)
CryptoPP::SHA256::Transform(pstate, pinput + n * 16);
}
}
bool BitcoinMiner()
{
printf("BitcoinMiner started\n");
CKey key;
key.MakeNewKey();
CBigNum bnExtraNonce = 0;
while (fGenerateBitcoins)
{
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_LOWEST);
Sleep(50);
CheckForShutdown(3);
while (vNodes.empty())
{
Sleep(1000);
CheckForShutdown(3);
}
unsigned int nTransactionsUpdatedLast = nTransactionsUpdated;
CBlockIndex* pindexPrev = pindexBest;
unsigned int nBits = GetNextWorkRequired(pindexPrev);
//
// Create coinbase tx
//
CTransaction txNew;
txNew.vin.resize(1);
txNew.vin[0].prevout.SetNull();
txNew.vin[0].scriptSig << nBits << ++bnExtraNonce;
txNew.vout.resize(1);
txNew.vout[0].scriptPubKey << key.GetPubKey() << OP_CHECKSIG;
//
// Create new block
//
auto_ptr<CBlock> pblock(new CBlock());
if (!pblock.get())
return false;
// Add our coinbase tx as first transaction
pblock->vtx.push_back(txNew);
// Collect the latest transactions into the block
int64 nFees = 0;
CRITICAL_BLOCK(cs_main)
CRITICAL_BLOCK(cs_mapTransactions)
{
CTxDB txdb("r");
map<uint256, CTxIndex> mapTestPool;
vector<char> vfAlreadyAdded(mapTransactions.size());
bool fFoundSomething = true;
unsigned int nBlockSize = 0;
while (fFoundSomething && nBlockSize < MAX_SIZE/2)
{
fFoundSomething = false;
unsigned int n = 0;
for (map<uint256, CTransaction>::iterator mi = mapTransactions.begin(); mi != mapTransactions.end(); ++mi, ++n)
{
if (vfAlreadyAdded[n])
continue;
CTransaction& tx = (*mi).second;
if (tx.IsCoinBase() || !tx.IsFinal())
continue;
// Transaction fee requirements, mainly only needed for flood control
// Under 10K (about 80 inputs) is free for first 100 transactions
// Base rate is 0.01 per KB
int64 nMinFee = tx.GetMinFee(pblock->vtx.size() < 100);
map<uint256, CTxIndex> mapTestPoolTmp(mapTestPool);
if (!tx.ConnectInputs(txdb, mapTestPoolTmp, CDiskTxPos(1,1,1), 0, nFees, false, true, nMinFee))
continue;
swap(mapTestPool, mapTestPoolTmp);
pblock->vtx.push_back(tx);
nBlockSize += ::GetSerializeSize(tx, SER_NETWORK);
vfAlreadyAdded[n] = true;
fFoundSomething = true;
}
}
}
pblock->nBits = nBits;
pblock->vtx[0].vout[0].nValue = pblock->GetBlockValue(nFees);
printf("Running BitcoinMiner with %d transactions in block\n", pblock->vtx.size());
//
// Prebuild hash buffer
//
struct unnamed1
{
struct unnamed2
{
int nVersion;
uint256 hashPrevBlock;
uint256 hashMerkleRoot;
unsigned int nTime;
unsigned int nBits;
unsigned int nNonce;
}
block;
unsigned char pchPadding0[64];
uint256 hash1;
unsigned char pchPadding1[64];
}
tmp;
tmp.block.nVersion = pblock->nVersion;
tmp.block.hashPrevBlock = pblock->hashPrevBlock = (pindexPrev ? pindexPrev->GetBlockHash() : 0);
tmp.block.hashMerkleRoot = pblock->hashMerkleRoot = pblock->BuildMerkleTree();
tmp.block.nTime = pblock->nTime = max((pindexPrev ? pindexPrev->GetMedianTimePast()+1 : 0), GetAdjustedTime());
tmp.block.nBits = pblock->nBits = nBits;
tmp.block.nNonce = pblock->nNonce = 1;
unsigned int nBlocks0 = FormatHashBlocks(&tmp.block, sizeof(tmp.block));
unsigned int nBlocks1 = FormatHashBlocks(&tmp.hash1, sizeof(tmp.hash1));
//
// Search
//
unsigned int nStart = GetTime();
uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
uint256 hash;
loop
{
BlockSHA256(&tmp.block, nBlocks0, &tmp.hash1);
BlockSHA256(&tmp.hash1, nBlocks1, &hash);
if (hash <= hashTarget)
{
pblock->nNonce = tmp.block.nNonce;
assert(hash == pblock->GetHash());
//// debug print
printf("BitcoinMiner:\n");
printf("proof-of-work found \n hash: %s \ntarget: %s\n", hash.GetHex().c_str(), hashTarget.GetHex().c_str());
pblock->print();
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_NORMAL);
CRITICAL_BLOCK(cs_main)
{
if (pindexPrev == pindexBest)
{
// Save key
if (!AddKey(key))
return false;
key.MakeNewKey();
// Process this block the same as if we had received it from another node
if (!ProcessBlock(NULL, pblock.release()))
printf("ERROR in BitcoinMiner, ProcessBlock, block not accepted\n");
}
}
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_LOWEST);
Sleep(500);
break;
}
// Update nTime every few seconds
if ((++tmp.block.nNonce & 0xffff) == 0)
{
CheckForShutdown(3);
if (tmp.block.nNonce == 0)
break;
if (pindexPrev != pindexBest)
break;
if (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60)
break;
if (vNodes.empty())
break;
if (!fGenerateBitcoins)
return true;
if (fLimitProcessors && vnThreadsRunning[3] > nLimitProcessors)
return true;
tmp.block.nTime = pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
}
}
}
return true;
}
//////////////////////////////////////////////////////////////////////////////
//
// Actions
//
int64 GetBalance()
{
int64 nStart = PerformanceCounter();
int64 nTotal = 0;
CRITICAL_BLOCK(cs_mapWallet)
{
for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
{
CWalletTx* pcoin = &(*it).second;
if (!pcoin->IsFinal() || pcoin->fSpent)
continue;
nTotal += pcoin->GetCredit();
}
}
///printf(" GetBalance() time = %15"PRI64d"\n", PerformanceCounter() - nStart);
return nTotal;
}
bool SelectCoins(int64 nTargetValue, set<CWalletTx*>& setCoinsRet)
{
setCoinsRet.clear();
// List of values less than target
int64 nLowestLarger = _I64_MAX;
CWalletTx* pcoinLowestLarger = NULL;
vector<pair<int64, CWalletTx*> > vValue;
int64 nTotalLower = 0;
CRITICAL_BLOCK(cs_mapWallet)
{
for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
{
CWalletTx* pcoin = &(*it).second;
if (!pcoin->IsFinal() || pcoin->fSpent)
continue;
int64 n = pcoin->GetCredit();
if (n <= 0)
continue;
if (n < nTargetValue)
{
vValue.push_back(make_pair(n, pcoin));
nTotalLower += n;
}
else if (n == nTargetValue)
{
setCoinsRet.insert(pcoin);
return true;
}
else if (n < nLowestLarger)
{
nLowestLarger = n;
pcoinLowestLarger = pcoin;
}
}
}
if (nTotalLower < nTargetValue)
{
if (pcoinLowestLarger == NULL)
return false;
setCoinsRet.insert(pcoinLowestLarger);
return true;
}
// Solve subset sum by stochastic approximation
sort(vValue.rbegin(), vValue.rend());
vector<char> vfIncluded;
vector<char> vfBest(vValue.size(), true);
int64 nBest = nTotalLower;
for (int nRep = 0; nRep < 1000 && nBest != nTargetValue; nRep++)
{
vfIncluded.assign(vValue.size(), false);
int64 nTotal = 0;
bool fReachedTarget = false;
for (int nPass = 0; nPass < 2 && !fReachedTarget; nPass++)
{
for (int i = 0; i < vValue.size(); i++)
{
if (nPass == 0 ? rand() % 2 : !vfIncluded[i])
{
nTotal += vValue[i].first;
vfIncluded[i] = true;
if (nTotal >= nTargetValue)
{
fReachedTarget = true;
if (nTotal < nBest)
{
nBest = nTotal;
vfBest = vfIncluded;
}
nTotal -= vValue[i].first;
vfIncluded[i] = false;
}
}
}
}
}
// If the next larger is still closer, return it
if (pcoinLowestLarger && nLowestLarger - nTargetValue <= nBest - nTargetValue)
setCoinsRet.insert(pcoinLowestLarger);
else
{
for (int i = 0; i < vValue.size(); i++)
if (vfBest[i])
setCoinsRet.insert(vValue[i].second);
//// debug print
printf("SelectCoins() best subset: ");
for (int i = 0; i < vValue.size(); i++)
if (vfBest[i])
printf("%s ", FormatMoney(vValue[i].first).c_str());
printf("total %s\n", FormatMoney(nBest).c_str());
}
return true;
}
bool CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CKey& keyRet, int64& nFeeRequiredRet)
{
nFeeRequiredRet = 0;
CRITICAL_BLOCK(cs_main)
{
// txdb must be opened before the mapWallet lock
CTxDB txdb("r");
CRITICAL_BLOCK(cs_mapWallet)
{
int64 nFee = nTransactionFee;
loop
{
wtxNew.vin.clear();
wtxNew.vout.clear();
if (nValue < 0)
return false;
int64 nValueOut = nValue;
nValue += nFee;
// Choose coins to use
set<CWalletTx*> setCoins;
if (!SelectCoins(nValue, setCoins))
return false;
int64 nValueIn = 0;
foreach(CWalletTx* pcoin, setCoins)
nValueIn += pcoin->GetCredit();
// Fill a vout to the payee
bool fChangeFirst = GetRand(2);
if (!fChangeFirst)
wtxNew.vout.push_back(CTxOut(nValueOut, scriptPubKey));
// Fill a vout back to self with any change
if (nValueIn > nValue)
{
// New private key
if (keyRet.IsNull())
keyRet.MakeNewKey();
// Fill a vout to ourself
CScript scriptPubKey;
scriptPubKey << keyRet.GetPubKey() << OP_CHECKSIG;
wtxNew.vout.push_back(CTxOut(nValueIn - nValue, scriptPubKey));
}
// Fill a vout to the payee
if (fChangeFirst)
wtxNew.vout.push_back(CTxOut(nValueOut, scriptPubKey));
// Fill vin
foreach(CWalletTx* pcoin, setCoins)
for (int nOut = 0; nOut < pcoin->vout.size(); nOut++)
if (pcoin->vout[nOut].IsMine())
wtxNew.vin.push_back(CTxIn(pcoin->GetHash(), nOut));
// Sign
int nIn = 0;
foreach(CWalletTx* pcoin, setCoins)
for (int nOut = 0; nOut < pcoin->vout.size(); nOut++)
if (pcoin->vout[nOut].IsMine())
SignSignature(*pcoin, wtxNew, nIn++);
// Check that enough fee is included
if (nFee < wtxNew.GetMinFee(true))
{
nFee = nFeeRequiredRet = wtxNew.GetMinFee(true);
continue;
}
// Fill vtxPrev by copying from previous transactions vtxPrev
wtxNew.AddSupportingTransactions(txdb);
wtxNew.fTimeReceivedIsTxTime = true;
break;
}
}
}
return true;
}
// Call after CreateTransaction unless you want to abort
bool CommitTransactionSpent(const CWalletTx& wtxNew, const CKey& key)
{
CRITICAL_BLOCK(cs_main)
CRITICAL_BLOCK(cs_mapWallet)
{
//// todo: eventually should make this transactional, never want to add a
//// transaction without marking spent transactions, although the risk of
//// interruption during this step is remote.
// This is only to keep the database open to defeat the auto-flush for the
// duration of this scope. This is the only place where this optimization
// maybe makes sense; please don't do it anywhere else. Keeping databases
// open longer than necessary can create deadlocks.
CWalletDB walletdb("r");
// Add the change's private key to wallet
if (!key.IsNull() && !AddKey(key))
throw runtime_error("CommitTransactionSpent() : AddKey failed\n");
// Add tx to wallet, because if it has change it's also ours,
// otherwise just for transaction history.
AddToWallet(wtxNew);
// Mark old coins as spent
set<CWalletTx*> setCoins;
foreach(const CTxIn& txin, wtxNew.vin)
setCoins.insert(&mapWallet[txin.prevout.hash]);
foreach(CWalletTx* pcoin, setCoins)
{
pcoin->fSpent = true;
pcoin->WriteToDisk();
vWalletUpdated.push_back(pcoin->GetHash());
}
}
MainFrameRepaint();
return true;
}
bool SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew)
{
CRITICAL_BLOCK(cs_main)
{
CKey key;
int64 nFeeRequired;
if (!CreateTransaction(scriptPubKey, nValue, wtxNew, key, nFeeRequired))
{
string strError;
if (nValue + nFeeRequired > GetBalance())
strError = strprintf("Error: This is an oversized transaction that requires a transaction fee of %s ", FormatMoney(nFeeRequired).c_str());
else
strError = "Error: Transaction creation failed ";
wxMessageBox(strError, "Sending...");
return error("SendMoney() : %s", strError.c_str());
}
if (!CommitTransactionSpent(wtxNew, key))
{
wxMessageBox("Error finalizing transaction ", "Sending...");
return error("SendMoney() : Error finalizing transaction");
}
printf("SendMoney: %s\n", wtxNew.GetHash().ToString().substr(0,6).c_str());
// Broadcast
if (!wtxNew.AcceptTransaction())
{
// This must not fail. The transaction has already been signed and recorded.
throw runtime_error("SendMoney() : wtxNew.AcceptTransaction() failed\n");
wxMessageBox("Error: Transaction not valid ", "Sending...");
return error("SendMoney() : Error: Transaction not valid");
}
wtxNew.RelayWalletTransaction();
}
MainFrameRepaint();
return true;
}
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