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miner.cpp
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "miner.h"
#include "amount.h"
#include "chain.h"
#include "chainparams.h"
#include "coins.h"
#include "consensus/consensus.h"
#include "consensus/merkle.h"
#include "consensus/validation.h"
#include "hash.h"
#include "validation.h"
#include "net.h"
#include "policy/policy.h"
#include "pow.h"
#include "pos.h"
#include "primitives/transaction.h"
#include "script/standard.h"
#include "timedata.h"
#include "txmempool.h"
#include "util.h"
#include "utilmoneystr.h"
#include "validationinterface.h"
#include "wallet/wallet.h"
#include <algorithm>
#include <boost/thread.hpp>
#include <boost/tuple/tuple.hpp>
#include <queue>
#include <utility>
//////////////////////////////////////////////////////////////////////////////
//
// BitcoinMiner
//
//
// Unconfirmed transactions in the memory pool often depend on other
// transactions in the memory pool. When we select transactions from the
// pool, we select by highest priority or fee rate, so we might consider
// transactions that depend on transactions that aren't yet in the block.
uint64_t nLastBlockTx = 0;
uint64_t nLastBlockSize = 0;
uint64_t nLastBlockWeight = 0;
int64_t nLastCoinStakeSearchInterval = 0;
unsigned int nMinerSleep = STAKER_POLLING_PERIOD;
class ScoreCompare
{
public:
ScoreCompare() {}
bool operator()(const CTxMemPool::txiter a, const CTxMemPool::txiter b)
{
return CompareTxMemPoolEntryByScore()(*b,*a); // Convert to less than
}
};
int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev)
{
int64_t nOldTime = pblock->nTime;
int64_t nNewTime = std::max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
if (nOldTime < nNewTime)
pblock->nTime = nNewTime;
// Updating time can change work required on testnet:
if (consensusParams.fPowAllowMinDifficultyBlocks)
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, consensusParams,pblock->IsProofOfStake());
return nNewTime - nOldTime;
}
BlockAssembler::BlockAssembler(const CChainParams& _chainparams)
: chainparams(_chainparams)
{
// Block resource limits
// If neither -blockmaxsize or -blockmaxweight is given, limit to DEFAULT_BLOCK_MAX_*
// If only one is given, only restrict the specified resource.
// If both are given, restrict both.
nBlockMaxWeight = DEFAULT_BLOCK_MAX_WEIGHT;
nBlockMaxSize = DEFAULT_BLOCK_MAX_SIZE;
bool fWeightSet = false;
if (IsArgSet("-blockmaxweight")) {
nBlockMaxWeight = GetArg("-blockmaxweight", DEFAULT_BLOCK_MAX_WEIGHT);
nBlockMaxSize = dgpMaxBlockSerSize;
fWeightSet = true;
}
if (IsArgSet("-blockmaxsize")) {
nBlockMaxSize = GetArg("-blockmaxsize", DEFAULT_BLOCK_MAX_SIZE);
if (!fWeightSet) {
nBlockMaxWeight = nBlockMaxSize * WITNESS_SCALE_FACTOR;
}
}
if (IsArgSet("-blockmintxfee")) {
CAmount n = 0;
ParseMoney(GetArg("-blockmintxfee", ""), n);
blockMinFeeRate = CFeeRate(n);
} else {
blockMinFeeRate = CFeeRate(DEFAULT_BLOCK_MIN_TX_FEE);
}
// Limit weight to between 4K and dgpMaxBlockWeight-4K for sanity:
nBlockMaxWeight = std::max((unsigned int)4000, std::min((unsigned int)(dgpMaxBlockWeight-4000), nBlockMaxWeight));
// Limit size to between 1K and dgpMaxBlockSerSize-1K for sanity:
nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(dgpMaxBlockSerSize-1000), nBlockMaxSize));
// Whether we need to account for byte usage (in addition to weight usage)
fNeedSizeAccounting = (nBlockMaxSize < dgpMaxBlockSerSize-1000);
}
void BlockAssembler::resetBlock()
{
inBlock.clear();
// Reserve space for coinbase tx
nBlockSize = 1000;
nBlockWeight = 4000;
nBlockSigOpsCost = 400;
fIncludeWitness = false;
// These counters do not include coinbase tx
nBlockTx = 0;
nFees = 0;
lastFewTxs = 0;
blockFinished = false;
}
void BlockAssembler::RebuildRefundTransaction(){
int refundtx=0; //0 for coinbase in PoW
if(pblock->IsProofOfStake()){
refundtx=1; //1 for coinstake in PoS
}
CMutableTransaction contrTx(originalRewardTx);
contrTx.vout[refundtx].nValue = nFees + GetBlockSubsidy(nHeight, chainparams.GetConsensus());
contrTx.vout[refundtx].nValue -= bceResult.refundSender;
//note, this will need changed for MPoS
int i=contrTx.vout.size();
contrTx.vout.resize(contrTx.vout.size()+bceResult.refundOutputs.size());
for(CTxOut& vout : bceResult.refundOutputs){
contrTx.vout[i]=vout;
i++;
}
pblock->vtx[refundtx] = MakeTransactionRef(std::move(contrTx));
}
std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& scriptPubKeyIn, bool fProofOfStake, int64_t* pTotalFees, int32_t txProofTime, int32_t nTimeLimit)
{
resetBlock();
pblocktemplate.reset(new CBlockTemplate());
if(!pblocktemplate.get())
return nullptr;
pblock = &pblocktemplate->block; // pointer for convenience
this->nTimeLimit = nTimeLimit;
// Add dummy coinbase tx as first transaction
pblock->vtx.emplace_back();
// Add dummy coinstake tx as second transaction
if(fProofOfStake)
pblock->vtx.emplace_back();
pblocktemplate->vTxFees.push_back(-1); // updated at end
pblocktemplate->vTxSigOpsCost.push_back(-1); // updated at end
LOCK2(cs_main, mempool.cs);
CBlockIndex* pindexPrev = chainActive.Tip();
nHeight = pindexPrev->nHeight + 1;
pblock->nVersion = ComputeBlockVersion(pindexPrev, chainparams.GetConsensus());
// -regtest only: allow overriding block.nVersion with
// -blockversion=N to test forking scenarios
if (chainparams.MineBlocksOnDemand())
pblock->nVersion = GetArg("-blockversion", pblock->nVersion);
if(txProofTime == 0) {
txProofTime = GetAdjustedTime();
}
if(fProofOfStake)
txProofTime &= ~STAKE_TIMESTAMP_MASK;
pblock->nTime = txProofTime;
if (!fProofOfStake)
UpdateTime(pblock, chainparams.GetConsensus(), pindexPrev);
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, chainparams.GetConsensus(),fProofOfStake);
const int64_t nMedianTimePast = pindexPrev->GetMedianTimePast();
nLockTimeCutoff = (STANDARD_LOCKTIME_VERIFY_FLAGS & LOCKTIME_MEDIAN_TIME_PAST)
? nMedianTimePast
: pblock->GetBlockTime();
// Decide whether to include witness transactions
// This is only needed in case the witness softfork activation is reverted
// (which would require a very deep reorganization) or when
// -promiscuousmempoolflags is used.
// TODO: replace this with a call to main to assess validity of a mempool
// transaction (which in most cases can be a no-op).
fIncludeWitness = IsWitnessEnabled(pindexPrev, chainparams.GetConsensus());
nLastBlockTx = nBlockTx;
nLastBlockSize = nBlockSize;
nLastBlockWeight = nBlockWeight;
// Create coinbase transaction.
CMutableTransaction coinbaseTx;
coinbaseTx.vin.resize(1);
coinbaseTx.vin[0].prevout.SetNull();
coinbaseTx.vout.resize(1);
if (fProofOfStake)
{
// Make the coinbase tx empty in case of proof of stake
coinbaseTx.vout[0].SetEmpty();
}
else
{
coinbaseTx.vout[0].scriptPubKey = scriptPubKeyIn;
coinbaseTx.vout[0].nValue = nFees + GetBlockSubsidy(nHeight, chainparams.GetConsensus());
}
coinbaseTx.vin[0].scriptSig = CScript() << nHeight << OP_0;
originalRewardTx = coinbaseTx;
pblock->vtx[0] = MakeTransactionRef(std::move(coinbaseTx));
// Create coinstake transaction.
if(fProofOfStake)
{
CMutableTransaction coinstakeTx;
coinstakeTx.vout.resize(2);
coinstakeTx.vout[0].SetEmpty();
coinstakeTx.vout[1].scriptPubKey = scriptPubKeyIn;
originalRewardTx = coinstakeTx;
pblock->vtx[1] = MakeTransactionRef(std::move(coinstakeTx));
//this just makes CBlock::IsProofOfStake to return true
//real prevoutstake info is filled in later in SignBlock
pblock->prevoutStake.n=0;
}
//////////////////////////////////////////////////////// qtum
QtumDGP qtumDGP(globalState.get(), fGettingValuesDGP);
globalSealEngine->setQtumSchedule(qtumDGP.getGasSchedule(nHeight));
uint32_t blockSizeDGP = qtumDGP.getBlockSize(nHeight);
minGasPrice = qtumDGP.getMinGasPrice(nHeight);
if(IsArgSet("-staker-min-tx-gas-price")) {
CAmount stakerMinGasPrice;
if(ParseMoney(GetArg("-staker-min-tx-gas-price", ""), stakerMinGasPrice)) {
minGasPrice = std::max(minGasPrice, (uint64_t)stakerMinGasPrice);
}
}
hardBlockGasLimit = qtumDGP.getBlockGasLimit(nHeight);
softBlockGasLimit = GetArg("-staker-soft-block-gas-limit", hardBlockGasLimit);
softBlockGasLimit = std::min(softBlockGasLimit, hardBlockGasLimit);
txGasLimit = GetArg("-staker-max-tx-gas-limit", softBlockGasLimit);
nBlockMaxSize = blockSizeDGP ? blockSizeDGP : nBlockMaxSize;
dev::h256 oldHashStateRoot(globalState->rootHash());
dev::h256 oldHashUTXORoot(globalState->rootHashUTXO());
addPriorityTxs(minGasPrice);
addPackageTxs(minGasPrice);
pblock->hashStateRoot = uint256(h256Touint(dev::h256(globalState->rootHash())));
pblock->hashUTXORoot = uint256(h256Touint(dev::h256(globalState->rootHashUTXO())));
globalState->setRoot(oldHashStateRoot);
globalState->setRootUTXO(oldHashUTXORoot);
//this should already be populated by AddBlock in case of contracts, but if no contracts
//then it won't get populated
RebuildRefundTransaction();
////////////////////////////////////////////////////////
pblocktemplate->vchCoinbaseCommitment = GenerateCoinbaseCommitment(*pblock, pindexPrev, chainparams.GetConsensus(), fProofOfStake);
pblocktemplate->vTxFees[0] = -nFees;
uint64_t nSerializeSize = GetSerializeSize(*pblock, SER_NETWORK, PROTOCOL_VERSION);
LogPrint("miner", "CreateNewBlock(): total size: %u block weight: %u txs: %u fees: %ld sigops %d\n", nSerializeSize, GetBlockWeight(*pblock), nBlockTx, nFees, nBlockSigOpsCost);
// The total fee is the Fees minus the Refund
if (pTotalFees)
*pTotalFees = nFees - bceResult.refundSender;
// Fill in header
pblock->hashPrevBlock = pindexPrev->GetBlockHash();
pblock->nNonce = 0;
pblocktemplate->vTxSigOpsCost[0] = WITNESS_SCALE_FACTOR * GetLegacySigOpCount(*pblock->vtx[0]);
CValidationState state;
if (!fProofOfStake && !TestBlockValidity(state, chainparams, *pblock, pindexPrev, false, false)) {
throw std::runtime_error(strprintf("%s: TestBlockValidity failed: %s", __func__, FormatStateMessage(state)));
}
return std::move(pblocktemplate);
}
std::unique_ptr<CBlockTemplate> BlockAssembler::CreateEmptyBlock(const CScript& scriptPubKeyIn, bool fProofOfStake, int64_t* pTotalFees, int32_t nTime)
{
resetBlock();
pblocktemplate.reset(new CBlockTemplate());
if(!pblocktemplate.get())
return nullptr;
pblock = &pblocktemplate->block; // pointer for convenience
// Add dummy coinbase tx as first transaction
pblock->vtx.emplace_back();
// Add dummy coinstake tx as second transaction
if(fProofOfStake)
pblock->vtx.emplace_back();
pblocktemplate->vTxFees.push_back(-1); // updated at end
pblocktemplate->vTxSigOpsCost.push_back(-1); // updated at end
LOCK2(cs_main, mempool.cs);
CBlockIndex* pindexPrev = chainActive.Tip();
nHeight = pindexPrev->nHeight + 1;
pblock->nVersion = ComputeBlockVersion(pindexPrev, chainparams.GetConsensus());
// -regtest only: allow overriding block.nVersion with
// -blockversion=N to test forking scenarios
if (chainparams.MineBlocksOnDemand())
pblock->nVersion = GetArg("-blockversion", pblock->nVersion);
uint32_t txProofTime = nTime == 0 ? GetAdjustedTime() : nTime;
if(fProofOfStake)
txProofTime &= ~STAKE_TIMESTAMP_MASK;
pblock->nTime = txProofTime;
const int64_t nMedianTimePast = pindexPrev->GetMedianTimePast();
nLockTimeCutoff = (STANDARD_LOCKTIME_VERIFY_FLAGS & LOCKTIME_MEDIAN_TIME_PAST)
? nMedianTimePast
: pblock->GetBlockTime();
nLastBlockTx = nBlockTx;
nLastBlockSize = nBlockSize;
nLastBlockWeight = nBlockWeight;
// Create coinbase transaction.
CMutableTransaction coinbaseTx;
coinbaseTx.vin.resize(1);
coinbaseTx.vin[0].prevout.SetNull();
coinbaseTx.vout.resize(1);
if (fProofOfStake)
{
// Make the coinbase tx empty in case of proof of stake
coinbaseTx.vout[0].SetEmpty();
}
else
{
coinbaseTx.vout[0].scriptPubKey = scriptPubKeyIn;
coinbaseTx.vout[0].nValue = nFees + GetBlockSubsidy(nHeight, chainparams.GetConsensus());
}
coinbaseTx.vin[0].scriptSig = CScript() << nHeight << OP_0;
originalRewardTx = coinbaseTx;
pblock->vtx[0] = MakeTransactionRef(std::move(coinbaseTx));
// Create coinstake transaction.
if(fProofOfStake)
{
CMutableTransaction coinstakeTx;
coinstakeTx.vout.resize(2);
coinstakeTx.vout[0].SetEmpty();
coinstakeTx.vout[1].scriptPubKey = scriptPubKeyIn;
originalRewardTx = coinstakeTx;
pblock->vtx[1] = MakeTransactionRef(std::move(coinstakeTx));
//this just makes CBlock::IsProofOfStake to return true
//real prevoutstake info is filled in later in SignBlock
pblock->prevoutStake.n=0;
}
//////////////////////////////////////////////////////// qtum
//state shouldn't change here for an empty block, but if it's not valid it'll fail in CheckBlock later
pblock->hashStateRoot = uint256(h256Touint(dev::h256(globalState->rootHash())));
pblock->hashUTXORoot = uint256(h256Touint(dev::h256(globalState->rootHashUTXO())));
RebuildRefundTransaction();
////////////////////////////////////////////////////////
pblocktemplate->vchCoinbaseCommitment = GenerateCoinbaseCommitment(*pblock, pindexPrev, chainparams.GetConsensus(), fProofOfStake);
pblocktemplate->vTxFees[0] = -nFees;
// The total fee is the Fees minus the Refund
if (pTotalFees)
*pTotalFees = nFees - bceResult.refundSender;
// Fill in header
pblock->hashPrevBlock = pindexPrev->GetBlockHash();
if (!fProofOfStake)
UpdateTime(pblock, chainparams.GetConsensus(), pindexPrev);
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, chainparams.GetConsensus(),fProofOfStake);
pblock->nNonce = 0;
pblocktemplate->vTxSigOpsCost[0] = WITNESS_SCALE_FACTOR * GetLegacySigOpCount(*pblock->vtx[0]);
CValidationState state;
if (!fProofOfStake && !TestBlockValidity(state, chainparams, *pblock, pindexPrev, false, false)) {
throw std::runtime_error(strprintf("%s: TestBlockValidity failed: %s", __func__, FormatStateMessage(state)));
}
return std::move(pblocktemplate);
}
bool BlockAssembler::isStillDependent(CTxMemPool::txiter iter)
{
BOOST_FOREACH(CTxMemPool::txiter parent, mempool.GetMemPoolParents(iter))
{
if (!inBlock.count(parent)) {
return true;
}
}
return false;
}
void BlockAssembler::onlyUnconfirmed(CTxMemPool::setEntries& testSet)
{
for (CTxMemPool::setEntries::iterator iit = testSet.begin(); iit != testSet.end(); ) {
// Only test txs not already in the block
if (inBlock.count(*iit)) {
testSet.erase(iit++);
}
else {
iit++;
}
}
}
bool BlockAssembler::TestPackage(uint64_t packageSize, int64_t packageSigOpsCost)
{
// TODO: switch to weight-based accounting for packages instead of vsize-based accounting.
if (nBlockWeight + WITNESS_SCALE_FACTOR * packageSize >= nBlockMaxWeight)
return false;
if (nBlockSigOpsCost + packageSigOpsCost >= (uint64_t)dgpMaxBlockSigOps)
return false;
return true;
}
// Perform transaction-level checks before adding to block:
// - transaction finality (locktime)
// - premature witness (in case segwit transactions are added to mempool before
// segwit activation)
// - serialized size (in case -blockmaxsize is in use)
bool BlockAssembler::TestPackageTransactions(const CTxMemPool::setEntries& package)
{
uint64_t nPotentialBlockSize = nBlockSize; // only used with fNeedSizeAccounting
BOOST_FOREACH (const CTxMemPool::txiter it, package) {
if (!IsFinalTx(it->GetTx(), nHeight, nLockTimeCutoff))
return false;
if (!fIncludeWitness && it->GetTx().HasWitness())
return false;
if (fNeedSizeAccounting) {
uint64_t nTxSize = ::GetSerializeSize(it->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
if (nPotentialBlockSize + nTxSize >= nBlockMaxSize) {
return false;
}
nPotentialBlockSize += nTxSize;
}
}
return true;
}
bool BlockAssembler::TestForBlock(CTxMemPool::txiter iter)
{
if (nBlockWeight + iter->GetTxWeight() >= nBlockMaxWeight) {
// If the block is so close to full that no more txs will fit
// or if we've tried more than 50 times to fill remaining space
// then flag that the block is finished
if (nBlockWeight > nBlockMaxWeight - 400 || lastFewTxs > 50) {
blockFinished = true;
return false;
}
// Once we're within 4000 weight of a full block, only look at 50 more txs
// to try to fill the remaining space.
if (nBlockWeight > nBlockMaxWeight - 4000) {
lastFewTxs++;
}
return false;
}
if (fNeedSizeAccounting) {
if (nBlockSize + ::GetSerializeSize(iter->GetTx(), SER_NETWORK, PROTOCOL_VERSION) >= nBlockMaxSize) {
if (nBlockSize > nBlockMaxSize - 100 || lastFewTxs > 50) {
blockFinished = true;
return false;
}
if (nBlockSize > nBlockMaxSize - 1000) {
lastFewTxs++;
}
return false;
}
}
if (nBlockSigOpsCost + iter->GetSigOpCost() >= (uint64_t)dgpMaxBlockSigOps) {
// If the block has room for no more sig ops then
// flag that the block is finished
if (nBlockSigOpsCost > (uint64_t)dgpMaxBlockSigOps - 8) {
blockFinished = true;
return false;
}
// Otherwise attempt to find another tx with fewer sigops
// to put in the block.
return false;
}
// Must check that lock times are still valid
// This can be removed once MTP is always enforced
// as long as reorgs keep the mempool consistent.
if (!IsFinalTx(iter->GetTx(), nHeight, nLockTimeCutoff))
return false;
return true;
}
bool BlockAssembler::CheckBlockBeyondFull()
{
if (nBlockSize > dgpMaxBlockSerSize) {
return false;
}
if (nBlockSigOpsCost * WITNESS_SCALE_FACTOR > (uint64_t)dgpMaxBlockSigOps) {
return false;
}
return true;
}
bool BlockAssembler::AttemptToAddContractToBlock(CTxMemPool::txiter iter, uint64_t minGasPrice) {
if (nTimeLimit != 0 && GetAdjustedTime() >= nTimeLimit - BYTECODE_TIME_BUFFER) {
return false;
}
if (GetBoolArg("-disablecontractstaking", false))
{
return false;
}
dev::h256 oldHashStateRoot(globalState->rootHash());
dev::h256 oldHashUTXORoot(globalState->rootHashUTXO());
// operate on local vars first, then later apply to `this`
uint64_t nBlockWeight = this->nBlockWeight;
uint64_t nBlockSize = this->nBlockSize;
uint64_t nBlockSigOpsCost = this->nBlockSigOpsCost;
QtumTxConverter convert(iter->GetTx(), NULL, &pblock->vtx);
ExtractQtumTX resultConverter;
if(!convert.extractionQtumTransactions(resultConverter)){
//this check already happens when accepting txs into mempool
//therefore, this can only be triggered by using raw transactions on the staker itself
return false;
}
std::vector<QtumTransaction> qtumTransactions = resultConverter.first;
dev::u256 txGas = 0;
for(QtumTransaction qtumTransaction : qtumTransactions){
txGas += qtumTransaction.gas();
if(txGas > txGasLimit) {
// Limit the tx gas limit by the soft limit if such a limit has been specified.
return false;
}
if(bceResult.usedGas + qtumTransaction.gas() > softBlockGasLimit){
//if this transaction's gasLimit could cause block gas limit to be exceeded, then don't add it
return false;
}
if(qtumTransaction.gasPrice() < minGasPrice){
//if this transaction's gasPrice is less than the current DGP minGasPrice don't add it
return false;
}
}
// We need to pass the DGP's block gas limit (not the soft limit) since it is consensus critical.
ByteCodeExec exec(*pblock, qtumTransactions, hardBlockGasLimit);
if(!exec.performByteCode()){
//error, don't add contract
globalState->setRoot(oldHashStateRoot);
globalState->setRootUTXO(oldHashUTXORoot);
return false;
}
ByteCodeExecResult testExecResult;
if(!exec.processingResults(testExecResult)){
globalState->setRoot(oldHashStateRoot);
globalState->setRootUTXO(oldHashUTXORoot);
return false;
}
if(bceResult.usedGas + testExecResult.usedGas > softBlockGasLimit){
//if this transaction could cause block gas limit to be exceeded, then don't add it
globalState->setRoot(oldHashStateRoot);
globalState->setRootUTXO(oldHashUTXORoot);
return false;
}
//apply contractTx costs to local state
if (fNeedSizeAccounting) {
nBlockSize += ::GetSerializeSize(iter->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
}
nBlockWeight += iter->GetTxWeight();
nBlockSigOpsCost += iter->GetSigOpCost();
//apply value-transfer txs to local state
for (CTransaction &t : testExecResult.valueTransfers) {
if (fNeedSizeAccounting) {
nBlockSize += ::GetSerializeSize(t, SER_NETWORK, PROTOCOL_VERSION);
}
nBlockWeight += GetTransactionWeight(t);
nBlockSigOpsCost += GetLegacySigOpCount(t);
}
int proofTx = pblock->IsProofOfStake() ? 1 : 0;
//calculate sigops from new refund/proof tx
//first, subtract old proof tx
nBlockSigOpsCost -= GetLegacySigOpCount(*pblock->vtx[proofTx]);
// manually rebuild refundtx
CMutableTransaction contrTx(*pblock->vtx[proofTx]);
//note, this will need changed for MPoS
int i=contrTx.vout.size();
contrTx.vout.resize(contrTx.vout.size()+testExecResult.refundOutputs.size());
for(CTxOut& vout : testExecResult.refundOutputs){
contrTx.vout[i]=vout;
i++;
}
nBlockSigOpsCost += GetLegacySigOpCount(contrTx);
//all contract costs now applied to local state
//Check if block will be too big or too expensive with this contract execution
if (nBlockSigOpsCost * WITNESS_SCALE_FACTOR > (uint64_t)dgpMaxBlockSigOps ||
nBlockSize > dgpMaxBlockSerSize) {
//contract will not be added to block, so revert state to before we tried
globalState->setRoot(oldHashStateRoot);
globalState->setRootUTXO(oldHashUTXORoot);
return false;
}
//block is not too big, so apply the contract execution and it's results to the actual block
//apply local bytecode to global bytecode state
bceResult.usedGas += testExecResult.usedGas;
bceResult.refundSender += testExecResult.refundSender;
bceResult.refundOutputs.insert(bceResult.refundOutputs.end(), testExecResult.refundOutputs.begin(), testExecResult.refundOutputs.end());
bceResult.valueTransfers = std::move(testExecResult.valueTransfers);
pblock->vtx.emplace_back(iter->GetSharedTx());
pblocktemplate->vTxFees.push_back(iter->GetFee());
pblocktemplate->vTxSigOpsCost.push_back(iter->GetSigOpCost());
if (fNeedSizeAccounting) {
this->nBlockSize += ::GetSerializeSize(iter->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
}
this->nBlockWeight += iter->GetTxWeight();
++nBlockTx;
this->nBlockSigOpsCost += iter->GetSigOpCost();
nFees += iter->GetFee();
inBlock.insert(iter);
for (CTransaction &t : bceResult.valueTransfers) {
pblock->vtx.emplace_back(MakeTransactionRef(std::move(t)));
if (fNeedSizeAccounting) {
this->nBlockSize += ::GetSerializeSize(t, SER_NETWORK, PROTOCOL_VERSION);
}
this->nBlockWeight += GetTransactionWeight(t);
this->nBlockSigOpsCost += GetLegacySigOpCount(t);
++nBlockTx;
}
//calculate sigops from new refund/proof tx
this->nBlockSigOpsCost -= GetLegacySigOpCount(*pblock->vtx[proofTx]);
RebuildRefundTransaction();
this->nBlockSigOpsCost += GetLegacySigOpCount(*pblock->vtx[proofTx]);
bceResult.valueTransfers.clear();
return true;
}
void BlockAssembler::AddToBlock(CTxMemPool::txiter iter)
{
pblock->vtx.emplace_back(iter->GetSharedTx());
pblocktemplate->vTxFees.push_back(iter->GetFee());
pblocktemplate->vTxSigOpsCost.push_back(iter->GetSigOpCost());
if (fNeedSizeAccounting) {
nBlockSize += ::GetSerializeSize(iter->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
}
nBlockWeight += iter->GetTxWeight();
++nBlockTx;
nBlockSigOpsCost += iter->GetSigOpCost();
nFees += iter->GetFee();
inBlock.insert(iter);
bool fPrintPriority = GetBoolArg("-printpriority", DEFAULT_PRINTPRIORITY);
if (fPrintPriority) {
double dPriority = iter->GetPriority(nHeight);
CAmount dummy;
mempool.ApplyDeltas(iter->GetTx().GetHash(), dPriority, dummy);
LogPrintf("priority %.1f fee %s txid %s\n",
dPriority,
CFeeRate(iter->GetModifiedFee(), iter->GetTxSize()).ToString(),
iter->GetTx().GetHash().ToString());
}
}
void BlockAssembler::UpdatePackagesForAdded(const CTxMemPool::setEntries& alreadyAdded,
indexed_modified_transaction_set &mapModifiedTx)
{
BOOST_FOREACH(const CTxMemPool::txiter it, alreadyAdded) {
CTxMemPool::setEntries descendants;
mempool.CalculateDescendants(it, descendants);
// Insert all descendants (not yet in block) into the modified set
BOOST_FOREACH(CTxMemPool::txiter desc, descendants) {
if (alreadyAdded.count(desc))
continue;
modtxiter mit = mapModifiedTx.find(desc);
if (mit == mapModifiedTx.end()) {
CTxMemPoolModifiedEntry modEntry(desc);
modEntry.nSizeWithAncestors -= it->GetTxSize();
modEntry.nModFeesWithAncestors -= it->GetModifiedFee();
modEntry.nSigOpCostWithAncestors -= it->GetSigOpCost();
mapModifiedTx.insert(modEntry);
} else {
mapModifiedTx.modify(mit, update_for_parent_inclusion(it));
}
}
}
}
// Skip entries in mapTx that are already in a block or are present
// in mapModifiedTx (which implies that the mapTx ancestor state is
// stale due to ancestor inclusion in the block)
// Also skip transactions that we've already failed to add. This can happen if
// we consider a transaction in mapModifiedTx and it fails: we can then
// potentially consider it again while walking mapTx. It's currently
// guaranteed to fail again, but as a belt-and-suspenders check we put it in
// failedTx and avoid re-evaluation, since the re-evaluation would be using
// cached size/sigops/fee values that are not actually correct.
bool BlockAssembler::SkipMapTxEntry(CTxMemPool::txiter it, indexed_modified_transaction_set &mapModifiedTx, CTxMemPool::setEntries &failedTx)
{
assert (it != mempool.mapTx.end());
if (mapModifiedTx.count(it) || inBlock.count(it) || failedTx.count(it))
return true;
return false;
}
void BlockAssembler::SortForBlock(const CTxMemPool::setEntries& package, CTxMemPool::txiter entry, std::vector<CTxMemPool::txiter>& sortedEntries)
{
// Sort package by ancestor count
// If a transaction A depends on transaction B, then A's ancestor count
// must be greater than B's. So this is sufficient to validly order the
// transactions for block inclusion.
sortedEntries.clear();
sortedEntries.insert(sortedEntries.begin(), package.begin(), package.end());
std::sort(sortedEntries.begin(), sortedEntries.end(), CompareTxIterByAncestorCount());
}
// This transaction selection algorithm orders the mempool based
// on feerate of a transaction including all unconfirmed ancestors.
// Since we don't remove transactions from the mempool as we select them
// for block inclusion, we need an alternate method of updating the feerate
// of a transaction with its not-yet-selected ancestors as we go.
// This is accomplished by walking the in-mempool descendants of selected
// transactions and storing a temporary modified state in mapModifiedTxs.
// Each time through the loop, we compare the best transaction in
// mapModifiedTxs with the next transaction in the mempool to decide what
// transaction package to work on next.
void BlockAssembler::addPackageTxs(uint64_t minGasPrice)
{
// mapModifiedTx will store sorted packages after they are modified
// because some of their txs are already in the block
indexed_modified_transaction_set mapModifiedTx;
// Keep track of entries that failed inclusion, to avoid duplicate work
CTxMemPool::setEntries failedTx;
// Start by adding all descendants of previously added txs to mapModifiedTx
// and modifying them for their already included ancestors
UpdatePackagesForAdded(inBlock, mapModifiedTx);
CTxMemPool::indexed_transaction_set::index<ancestor_score_or_gas_price>::type::iterator mi = mempool.mapTx.get<ancestor_score_or_gas_price>().begin();
CTxMemPool::txiter iter;
while (mi != mempool.mapTx.get<ancestor_score_or_gas_price>().end() || !mapModifiedTx.empty())
{
if(nTimeLimit != 0 && GetAdjustedTime() >= nTimeLimit){
//no more time to add transactions, just exit
return;
}
// First try to find a new transaction in mapTx to evaluate.
if (mi != mempool.mapTx.get<ancestor_score_or_gas_price>().end() &&
SkipMapTxEntry(mempool.mapTx.project<0>(mi), mapModifiedTx, failedTx)) {
++mi;
continue;
}
// Now that mi is not stale, determine which transaction to evaluate:
// the next entry from mapTx, or the best from mapModifiedTx?
bool fUsingModified = false;
modtxscoreiter modit = mapModifiedTx.get<ancestor_score_or_gas_price>().begin();
if (mi == mempool.mapTx.get<ancestor_score_or_gas_price>().end()) {
// We're out of entries in mapTx; use the entry from mapModifiedTx
iter = modit->iter;
fUsingModified = true;
} else {
// Try to compare the mapTx entry to the mapModifiedTx entry
iter = mempool.mapTx.project<0>(mi);
if (modit != mapModifiedTx.get<ancestor_score_or_gas_price>().end() &&
CompareModifiedEntry()(*modit, CTxMemPoolModifiedEntry(iter))) {
// The best entry in mapModifiedTx has higher score
// than the one from mapTx.
// Switch which transaction (package) to consider
iter = modit->iter;
fUsingModified = true;
} else {
// Either no entry in mapModifiedTx, or it's worse than mapTx.
// Increment mi for the next loop iteration.
++mi;
}
}
// We skip mapTx entries that are inBlock, and mapModifiedTx shouldn't
// contain anything that is inBlock.
assert(!inBlock.count(iter));
uint64_t packageSize = iter->GetSizeWithAncestors();
CAmount packageFees = iter->GetModFeesWithAncestors();
int64_t packageSigOpsCost = iter->GetSigOpCostWithAncestors();
if (fUsingModified) {
packageSize = modit->nSizeWithAncestors;
packageFees = modit->nModFeesWithAncestors;
packageSigOpsCost = modit->nSigOpCostWithAncestors;
}
if (packageFees < blockMinFeeRate.GetFee(packageSize)) {
// Everything else we might consider has a lower fee rate
return;
}
if (!TestPackage(packageSize, packageSigOpsCost)) {
if (fUsingModified) {
// Since we always look at the best entry in mapModifiedTx,
// we must erase failed entries so that we can consider the
// next best entry on the next loop iteration
mapModifiedTx.get<ancestor_score_or_gas_price>().erase(modit);
failedTx.insert(iter);
}
continue;
}
CTxMemPool::setEntries ancestors;
uint64_t nNoLimit = std::numeric_limits<uint64_t>::max();
std::string dummy;
mempool.CalculateMemPoolAncestors(*iter, ancestors, nNoLimit, nNoLimit, nNoLimit, nNoLimit, dummy, false);
onlyUnconfirmed(ancestors);
ancestors.insert(iter);
// Test if all tx's are Final
if (!TestPackageTransactions(ancestors)) {
if (fUsingModified) {
mapModifiedTx.get<ancestor_score_or_gas_price>().erase(modit);
failedTx.insert(iter);
}
continue;
}
// Package can be added. Sort the entries in a valid order.
std::vector<CTxMemPool::txiter> sortedEntries;
SortForBlock(ancestors, iter, sortedEntries);
bool wasAdded=true;
for (size_t i=0; i<sortedEntries.size(); ++i) {
if(!wasAdded || (nTimeLimit != 0 && GetAdjustedTime() >= nTimeLimit))
{
//if out of time, or earlier ancestor failed, then skip the rest of the transactions
mapModifiedTx.erase(sortedEntries[i]);
wasAdded=false;
continue;
}
const CTransaction& tx = sortedEntries[i]->GetTx();
if(wasAdded) {
if (tx.HasCreateOrCall()) {
wasAdded = AttemptToAddContractToBlock(sortedEntries[i], minGasPrice);
if(!wasAdded){
if(fUsingModified) {
//this only needs to be done once to mark the whole package (everything in sortedEntries) as failed
mapModifiedTx.get<ancestor_score_or_gas_price>().erase(modit);
failedTx.insert(iter);
}
}
} else {
AddToBlock(sortedEntries[i]);
}
}
// Erase from the modified set, if present
mapModifiedTx.erase(sortedEntries[i]);
}
if(!wasAdded){
//skip UpdatePackages if a transaction failed to be added (match TestPackage logic)
continue;
}
// Update transactions that depend on each of these
UpdatePackagesForAdded(ancestors, mapModifiedTx);
}
}
void BlockAssembler::addPriorityTxs(uint64_t minGasPrice)
{
// How much of the block should be dedicated to high-priority transactions,
// included regardless of the fees they pay
unsigned int nBlockPrioritySize = GetArg("-blockprioritysize", DEFAULT_BLOCK_PRIORITY_SIZE);
nBlockPrioritySize = std::min(nBlockMaxSize, nBlockPrioritySize);
if (nBlockPrioritySize == 0) {
return;
}
bool fSizeAccounting = fNeedSizeAccounting;
fNeedSizeAccounting = true;
// This vector will be sorted into a priority queue:
std::vector<TxCoinAgePriority> vecPriority;
TxCoinAgePriorityCompare pricomparer;
std::map<CTxMemPool::txiter, double, CTxMemPool::CompareIteratorByHash> waitPriMap;
typedef std::map<CTxMemPool::txiter, double, CTxMemPool::CompareIteratorByHash>::iterator waitPriIter;
double actualPriority = -1;
vecPriority.reserve(mempool.mapTx.size());
for (CTxMemPool::indexed_transaction_set::iterator mi = mempool.mapTx.begin();
mi != mempool.mapTx.end(); ++mi)
{
double dPriority = mi->GetPriority(nHeight);
CAmount dummy;
mempool.ApplyDeltas(mi->GetTx().GetHash(), dPriority, dummy);
vecPriority.push_back(TxCoinAgePriority(dPriority, mi));
}
std::make_heap(vecPriority.begin(), vecPriority.end(), pricomparer);
CTxMemPool::txiter iter;
while (!vecPriority.empty() && !blockFinished) { // add a tx from priority queue to fill the blockprioritysize
iter = vecPriority.front().second;
actualPriority = vecPriority.front().first;
std::pop_heap(vecPriority.begin(), vecPriority.end(), pricomparer);
vecPriority.pop_back();
// If tx already in block, skip
if (inBlock.count(iter)) {
assert(false); // shouldn't happen for priority txs
continue;
}
// cannot accept witness transactions into a non-witness block
if (!fIncludeWitness && iter->GetTx().HasWitness())
continue;
if(nTimeLimit != 0 && GetAdjustedTime() >= nTimeLimit)
{
break;
}
// If tx is dependent on other mempool txs which haven't yet been included
// then put it in the waitSet
if (isStillDependent(iter)) {
waitPriMap.insert(std::make_pair(iter, actualPriority));
continue;
}
// If this tx fits in the block add it, otherwise keep looping
if (TestForBlock(iter)) {
const CTransaction& tx = iter->GetTx();
bool wasAdded=true;
if(tx.HasCreateOrCall()) {
wasAdded = AttemptToAddContractToBlock(iter, minGasPrice);
}else {
AddToBlock(iter);
}
// If now that this txs is added we've surpassed our desired priority size
// or have dropped below the AllowFreeThreshold, then we're done adding priority txs
if (nBlockSize >= nBlockPrioritySize || !AllowFree(actualPriority)) {
break;
}
if(wasAdded) {
// This tx was successfully added, so
// add transactions that depend on this one to the priority queue to try again
BOOST_FOREACH(CTxMemPool::txiter child, mempool.GetMemPoolChildren(iter)) {
waitPriIter wpiter = waitPriMap.find(child);
if (wpiter != waitPriMap.end()) {
vecPriority.push_back(TxCoinAgePriority(wpiter->second, child));
std::push_heap(vecPriority.begin(), vecPriority.end(), pricomparer);
waitPriMap.erase(wpiter);
}
}
}
}
}