bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
{
assert(!fClient);
txindex.SetNull();
if(TXReadWritePool)
{
boost::unordered_map<uint256, CTxIndex, BlockHasher>::iterator iter = TXReadWritePool->find(hash);
if(iter == TXReadWritePool->end())
return Read(make_pair(string("tx"), hash), txindex);
txindex = iter->second;
return true;
}
return Read(make_pair(string("tx"), hash), txindex);
}
bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
{
assert(!fClient);
txindex.SetNull();
return Read(make_pair(string("tx"), hash), txindex);
}
// CreateRestOfTheBlock: collect transactions into block and fill in header
bool CreateRestOfTheBlock(CBlock &block, CBlockIndex* pindexPrev)
{
int nHeight = pindexPrev->nHeight + 1;
// Create coinbase tx
CTransaction &CoinBase= block.vtx[0];
CoinBase.nTime=block.nTime;
CoinBase.vin.resize(1);
CoinBase.vin[0].prevout.SetNull();
CoinBase.vout.resize(1);
// Height first in coinbase required for block.version=2
CoinBase.vin[0].scriptSig = (CScript() << nHeight) + COINBASE_FLAGS;
assert(CoinBase.vin[0].scriptSig.size() <= 100);
CoinBase.vout[0].SetEmpty();
// Largest block you're willing to create:
unsigned int nBlockMaxSize = GetArg("-blockmaxsize", MAX_BLOCK_SIZE_GEN/2);
// Limit to betweeen 1K and MAX_BLOCK_SIZE-1K for sanity:
nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SIZE-1000), nBlockMaxSize));
// How much of the block should be dedicated to high-priority transactions,
// included regardless of the fees they pay
unsigned int nBlockPrioritySize = GetArg("-blockprioritysize", 27000);
nBlockPrioritySize = std::min(nBlockMaxSize, nBlockPrioritySize);
// Minimum block size you want to create; block will be filled with free transactions
// until there are no more or the block reaches this size:
unsigned int nBlockMinSize = GetArg("-blockminsize", 0);
nBlockMinSize = std::min(nBlockMaxSize, nBlockMinSize);
// Fee-per-kilobyte amount considered the same as "free"
// Be careful setting this: if you set it to zero then
// a transaction spammer can cheaply fill blocks using
// 1-satoshi-fee transactions. It should be set above the real
// cost to you of processing a transaction.
int64_t nMinTxFee = MIN_TX_FEE;
if (mapArgs.count("-mintxfee"))
ParseMoney(mapArgs["-mintxfee"], nMinTxFee);
// Collect memory pool transactions into the block
int64_t nFees = 0;
{
LOCK2(cs_main, mempool.cs);
CTxDB txdb("r");
// Priority order to process transactions
list<COrphan> vOrphan; // list memory doesn't move
map<uint256, vector<COrphan*> > mapDependers;
// This vector will be sorted into a priority queue:
vector<TxPriority> vecPriority;
vecPriority.reserve(mempool.mapTx.size());
for (map<uint256, CTransaction>::iterator mi = mempool.mapTx.begin(); mi != mempool.mapTx.end(); ++mi)
{
CTransaction& tx = (*mi).second;
if (tx.IsCoinBase() || tx.IsCoinStake() || !IsFinalTx(tx, nHeight))
continue;
COrphan* porphan = NULL;
double dPriority = 0;
int64_t nTotalIn = 0;
bool fMissingInputs = false;
for (auto const& txin : tx.vin)
{
// Read prev transaction
CTransaction txPrev;
CTxIndex txindex;
if (fDebug10) LogPrintf("Enumerating tx %s ",tx.GetHash().GetHex());
if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
{
// This should never happen; all transactions in the memory
// pool should connect to either transactions in the chain
// or other transactions in the memory pool.
if (!mempool.mapTx.count(txin.prevout.hash))
{
LogPrintf("ERROR: mempool transaction missing input\n");
if (fDebug) assert("mempool transaction missing input" == 0);
fMissingInputs = true;
if (porphan)
vOrphan.pop_back();
break;
}
// Has to wait for dependencies
if (!porphan)
{
// Use list for automatic deletion
vOrphan.push_back(COrphan(&tx));
porphan = &vOrphan.back();
if (fDebug10) LogPrintf("Orphan tx %s ",tx.GetHash().GetHex());
msMiningErrorsExcluded += tx.GetHash().GetHex() + ":ORPHAN;";
}
mapDependers[txin.prevout.hash].push_back(porphan);
porphan->setDependsOn.insert(txin.prevout.hash);
nTotalIn += mempool.mapTx[txin.prevout.hash].vout[txin.prevout.n].nValue;
continue;
}
int64_t nValueIn = txPrev.vout[txin.prevout.n].nValue;
nTotalIn += nValueIn;
int nConf = txindex.GetDepthInMainChain();
dPriority += (double)nValueIn * nConf;
}
if (fMissingInputs) continue;
// Priority is sum(valuein * age) / txsize
unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
dPriority /= nTxSize;
// This is a more accurate fee-per-kilobyte than is used by the client code, because the
// client code rounds up the size to the nearest 1K. That's good, because it gives an
// incentive to create smaller transactions.
double dFeePerKb = double(nTotalIn-tx.GetValueOut()) / (double(nTxSize)/1000.0);
if (porphan)
{
porphan->dPriority = dPriority;
porphan->dFeePerKb = dFeePerKb;
}
else
vecPriority.push_back(TxPriority(dPriority, dFeePerKb, &(*mi).second));
}
// Collect transactions into block
map<uint256, CTxIndex> mapTestPool;
uint64_t nBlockSize = 1000;
uint64_t nBlockTx = 0;
int nBlockSigOps = 100;
bool fSortedByFee = (nBlockPrioritySize <= 0);
TxPriorityCompare comparer(fSortedByFee);
std::make_heap(vecPriority.begin(), vecPriority.end(), comparer);
while (!vecPriority.empty())
{
// Take highest priority transaction off the priority queue:
double dPriority = vecPriority.front().get<0>();
double dFeePerKb = vecPriority.front().get<1>();
CTransaction& tx = *(vecPriority.front().get<2>());
std::pop_heap(vecPriority.begin(), vecPriority.end(), comparer);
vecPriority.pop_back();
// Size limits
unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
if (fDebug10) LogPrintf("Tx Size for %s %f",tx.GetHash().GetHex(), (double)nTxSize);
if (nBlockSize + nTxSize >= nBlockMaxSize)
{
if (fDebug10) LogPrintf("Tx size too large for tx %s blksize %f , tx siz %f",tx.GetHash().GetHex().c_str(),(double)nBlockSize,(double)nTxSize);
msMiningErrorsExcluded += tx.GetHash().GetHex() + ":SizeTooLarge("
+ ToString(nBlockSize) + "," + ToString(nTxSize) + ")("
+ ToString(nBlockSize) + ");";
continue;
}
// Legacy limits on sigOps:
unsigned int nTxSigOps = tx.GetLegacySigOpCount();
if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
{
msMiningErrorsExcluded += tx.GetHash().GetHex() + ":LegacySigOpLimit(" +
ToString(nBlockSigOps) + "," + ToString(nTxSigOps) + ")("
+ ToString(MAX_BLOCK_SIGOPS) + ");";
continue;
}
// Timestamp limit
if (tx.nTime > block.nTime)
{
msMiningErrorsExcluded += tx.GetHash().GetHex() + ":TimestampLimit(" + ToString(tx.nTime) + ","
+ ToString(block.vtx[0].nTime) + ");";
continue;
}
// Transaction fee
int64_t nMinFee = tx.GetMinFee(nBlockSize, GMF_BLOCK);
// Skip free transactions if we're past the minimum block size:
if (fSortedByFee && (dFeePerKb < nMinTxFee) && (nBlockSize + nTxSize >= nBlockMinSize))
continue;
// Prioritize by fee once past the priority size or we run out of high-priority
// transactions:
if (!fSortedByFee &&
((nBlockSize + nTxSize >= nBlockPrioritySize) || (dPriority < COIN * 144 / 250)))
{
fSortedByFee = true;
comparer = TxPriorityCompare(fSortedByFee);
std::make_heap(vecPriority.begin(), vecPriority.end(), comparer);
}
// Connecting shouldn't fail due to dependency on other memory pool transactions
// because we're already processing them in order of dependency
map<uint256, CTxIndex> mapTestPoolTmp(mapTestPool);
MapPrevTx mapInputs;
bool fInvalid;
if (!tx.FetchInputs(txdb, mapTestPoolTmp, false, true, mapInputs, fInvalid))
{
if (fDebug10) LogPrintf("Unable to fetch inputs for tx %s ", tx.GetHash().GetHex());
msMiningErrorsExcluded += tx.GetHash().GetHex() + ":UnableToFetchInputs;";
continue;
}
int64_t nTxFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
if (nTxFees < nMinFee)
{
if (fDebug10) LogPrintf("Not including tx %s due to TxFees of %f ; bare min fee is %f", tx.GetHash().GetHex(), (double)nTxFees, (double)nMinFee);
msMiningErrorsExcluded += tx.GetHash().GetHex() + ":FeeTooSmall("
+ RoundToString(CoinToDouble(nFees),8) + "," +RoundToString(CoinToDouble(nMinFee),8) + ");";
continue;
}
nTxSigOps += tx.GetP2SHSigOpCount(mapInputs);
if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
{
if (fDebug10) LogPrintf("Not including tx %s due to exceeding max sigops of %f ; sigops is %f",
tx.GetHash().GetHex(), (double)(nBlockSigOps+nTxSigOps), (double)MAX_BLOCK_SIGOPS);
msMiningErrorsExcluded += tx.GetHash().GetHex() + ":ExceededSigOps("
+ ToString(nBlockSigOps) + "," + ToString(nTxSigOps) + ")("
+ ToString(MAX_BLOCK_SIGOPS) + ");";
continue;
}
if (!tx.ConnectInputs(txdb, mapInputs, mapTestPoolTmp, CDiskTxPos(1,1,1), pindexPrev, false, true))
{
if (fDebug10) LogPrintf("Unable to connect inputs for tx %s ",tx.GetHash().GetHex());
msMiningErrorsExcluded += tx.GetHash().GetHex() + ":UnableToConnectInputs();";
continue;
}
mapTestPoolTmp[tx.GetHash()] = CTxIndex(CDiskTxPos(1,1,1), tx.vout.size());
swap(mapTestPool, mapTestPoolTmp);
// Added
msMiningErrorsIncluded += tx.GetHash().GetHex() + ";";
block.vtx.push_back(tx);
nBlockSize += nTxSize;
++nBlockTx;
nBlockSigOps += nTxSigOps;
nFees += nTxFees;
if (fDebug10 || GetBoolArg("-printpriority"))
{
LogPrintf("priority %.1f feeperkb %.1f txid %s\n",
dPriority, dFeePerKb, tx.GetHash().ToString());
}
// Add transactions that depend on this one to the priority queue
uint256 hash = tx.GetHash();
if (mapDependers.count(hash))
{
for (auto const& porphan : mapDependers[hash])
{
if (!porphan->setDependsOn.empty())
{
porphan->setDependsOn.erase(hash);
if (porphan->setDependsOn.empty())
{
vecPriority.push_back(TxPriority(porphan->dPriority, porphan->dFeePerKb, porphan->ptx));
std::push_heap(vecPriority.begin(), vecPriority.end(), comparer);
}
}
}
}
}
if (fDebug10 || GetBoolArg("-printpriority"))
LogPrintf("CreateNewBlock(): total size %" PRIu64 "\n", nBlockSize);
}
//Add fees to coinbase
block.vtx[0].vout[0].nValue= nFees;
// Fill in header
block.hashPrevBlock = pindexPrev->GetBlockHash();
block.vtx[0].nTime=block.nTime;
return true;
}