diff --git a/doc/release-notes.md b/doc/release-notes.md
index 0fa577edd..aba6a674c 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -1,5 +1,6 @@
Bitcoin ABC version 0.16.3 is now available from:
This release includes the following features and fixes:
+ - Add monolithactivationtime configuration in order to chose when the May, 15 hard fork activates. This value should not be changed in production, but it allows user to test the fork activation ahead of time.
diff --git a/src/validation.cpp b/src/validation.cpp
index ed930fd8c..0a1803592 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1,5342 +1,5344 @@
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Copyright (c) 2017 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "validation.h"
#include "arith_uint256.h"
#include "chainparams.h"
#include "checkpoints.h"
#include "checkqueue.h"
#include "config.h"
#include "consensus/consensus.h"
#include "consensus/merkle.h"
#include "consensus/validation.h"
#include "fs.h"
#include "hash.h"
#include "init.h"
#include "policy/fees.h"
#include "policy/policy.h"
#include "pow.h"
#include "primitives/block.h"
#include "primitives/transaction.h"
#include "random.h"
#include "script/script.h"
#include "script/scriptcache.h"
#include "script/sigcache.h"
#include "script/standard.h"
#include "timedata.h"
#include "tinyformat.h"
#include "txdb.h"
#include "txmempool.h"
#include "ui_interface.h"
#include "undo.h"
#include "util.h"
#include "utilmoneystr.h"
#include "utilstrencodings.h"
#include "validationinterface.h"
#include "versionbits.h"
#include "warnings.h"
#include
#include
#include
#include
#include
#include
#include
#include
#if defined(NDEBUG)
#error "Bitcoin cannot be compiled without assertions."
#endif
/**
* Global state
*/
CCriticalSection cs_main;
BlockMap mapBlockIndex;
CChain chainActive;
CBlockIndex *pindexBestHeader = nullptr;
CWaitableCriticalSection csBestBlock;
CConditionVariable cvBlockChange;
int nScriptCheckThreads = 0;
std::atomic_bool fImporting(false);
bool fReindex = false;
bool fTxIndex = false;
bool fHavePruned = false;
bool fPruneMode = false;
bool fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
bool fRequireStandard = true;
bool fCheckBlockIndex = false;
bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED;
size_t nCoinCacheUsage = 5000 * 300;
uint64_t nPruneTarget = 0;
int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE;
uint256 hashAssumeValid;
arith_uint256 nMinimumChainWork;
CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE);
Amount maxTxFee = DEFAULT_TRANSACTION_MAXFEE;
CTxMemPool mempool(::minRelayTxFee);
static void CheckBlockIndex(const Consensus::Params &consensusParams);
/** Constant stuff for coinbase transactions we create: */
CScript COINBASE_FLAGS;
const std::string strMessageMagic = "Bitcoin Signed Message:\n";
// Internal stuff
namespace {
struct CBlockIndexWorkComparator {
bool operator()(const CBlockIndex *pa, const CBlockIndex *pb) const {
// First sort by most total work, ...
if (pa->nChainWork > pb->nChainWork) return false;
if (pa->nChainWork < pb->nChainWork) return true;
// ... then by earliest time received, ...
if (pa->nSequenceId < pb->nSequenceId) return false;
if (pa->nSequenceId > pb->nSequenceId) return true;
// Use pointer address as tie breaker (should only happen with blocks
// loaded from disk, as those all have id 0).
if (pa < pb) return false;
if (pa > pb) return true;
// Identical blocks.
return false;
}
};
CBlockIndex *pindexBestInvalid;
/**
* The set of all CBlockIndex entries with BLOCK_VALID_TRANSACTIONS (for itself
* and all ancestors) and as good as our current tip or better. Entries may be
* failed, though, and pruning nodes may be missing the data for the block.
*/
std::set setBlockIndexCandidates;
/**
* All pairs A->B, where A (or one of its ancestors) misses transactions, but B
* has transactions. Pruned nodes may have entries where B is missing data.
*/
std::multimap mapBlocksUnlinked;
CCriticalSection cs_LastBlockFile;
std::vector vinfoBlockFile;
int nLastBlockFile = 0;
/**
* Global flag to indicate we should check to see if there are block/undo files
* that should be deleted. Set on startup or if we allocate more file space when
* we're in prune mode.
*/
bool fCheckForPruning = false;
/**
* Every received block is assigned a unique and increasing identifier, so we
* know which one to give priority in case of a fork.
*/
CCriticalSection cs_nBlockSequenceId;
/** Blocks loaded from disk are assigned id 0, so start the counter at 1. */
int32_t nBlockSequenceId = 1;
/** Decreasing counter (used by subsequent preciousblock calls). */
int32_t nBlockReverseSequenceId = -1;
/** chainwork for the last block that preciousblock has been applied to. */
arith_uint256 nLastPreciousChainwork = 0;
/** Dirty block index entries. */
std::set setDirtyBlockIndex;
/** Dirty block file entries. */
std::set setDirtyFileInfo;
} // namespace
CBlockIndex *FindForkInGlobalIndex(const CChain &chain,
const CBlockLocator &locator) {
// Find the first block the caller has in the main chain
for (const uint256 &hash : locator.vHave) {
BlockMap::iterator mi = mapBlockIndex.find(hash);
if (mi != mapBlockIndex.end()) {
CBlockIndex *pindex = (*mi).second;
if (chain.Contains(pindex)) return pindex;
if (pindex->GetAncestor(chain.Height()) == chain.Tip()) {
return chain.Tip();
}
}
}
return chain.Genesis();
}
CCoinsViewCache *pcoinsTip = nullptr;
CBlockTreeDB *pblocktree = nullptr;
enum FlushStateMode {
FLUSH_STATE_NONE,
FLUSH_STATE_IF_NEEDED,
FLUSH_STATE_PERIODIC,
FLUSH_STATE_ALWAYS
};
// See definition for documentation
static bool FlushStateToDisk(const CChainParams &chainParams,
CValidationState &state, FlushStateMode mode,
int nManualPruneHeight = 0);
static void FindFilesToPruneManual(std::set &setFilesToPrune,
int nManualPruneHeight);
static void FindFilesToPrune(std::set &setFilesToPrune,
uint64_t nPruneAfterHeight);
static FILE *OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly = false);
static uint32_t GetBlockScriptFlags(const CBlockIndex *pindex,
const Config &config);
static bool IsFinalTx(const CTransaction &tx, int nBlockHeight,
int64_t nBlockTime) {
if (tx.nLockTime == 0) {
return true;
}
int64_t lockTime = tx.nLockTime;
int64_t lockTimeLimit =
(lockTime < LOCKTIME_THRESHOLD) ? nBlockHeight : nBlockTime;
if (lockTime < lockTimeLimit) {
return true;
}
for (const auto &txin : tx.vin) {
if (txin.nSequence != CTxIn::SEQUENCE_FINAL) {
return false;
}
}
return true;
}
/**
* Calculates the block height and previous block's median time past at
* which the transaction will be considered final in the context of BIP 68.
* Also removes from the vector of input heights any entries which did not
* correspond to sequence locked inputs as they do not affect the calculation.
*/
static std::pair
CalculateSequenceLocks(const CTransaction &tx, int flags,
std::vector *prevHeights,
const CBlockIndex &block) {
assert(prevHeights->size() == tx.vin.size());
// Will be set to the equivalent height- and time-based nLockTime
// values that would be necessary to satisfy all relative lock-
// time constraints given our view of block chain history.
// The semantics of nLockTime are the last invalid height/time, so
// use -1 to have the effect of any height or time being valid.
int nMinHeight = -1;
int64_t nMinTime = -1;
// tx.nVersion is signed integer so requires cast to unsigned otherwise
// we would be doing a signed comparison and half the range of nVersion
// wouldn't support BIP 68.
bool fEnforceBIP68 = static_cast(tx.nVersion) >= 2 &&
flags & LOCKTIME_VERIFY_SEQUENCE;
// Do not enforce sequence numbers as a relative lock time
// unless we have been instructed to
if (!fEnforceBIP68) {
return std::make_pair(nMinHeight, nMinTime);
}
for (size_t txinIndex = 0; txinIndex < tx.vin.size(); txinIndex++) {
const CTxIn &txin = tx.vin[txinIndex];
// Sequence numbers with the most significant bit set are not
// treated as relative lock-times, nor are they given any
// consensus-enforced meaning at this point.
if (txin.nSequence & CTxIn::SEQUENCE_LOCKTIME_DISABLE_FLAG) {
// The height of this input is not relevant for sequence locks
(*prevHeights)[txinIndex] = 0;
continue;
}
int nCoinHeight = (*prevHeights)[txinIndex];
if (txin.nSequence & CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG) {
int64_t nCoinTime = block.GetAncestor(std::max(nCoinHeight - 1, 0))
->GetMedianTimePast();
// NOTE: Subtract 1 to maintain nLockTime semantics.
// BIP 68 relative lock times have the semantics of calculating the
// first block or time at which the transaction would be valid. When
// calculating the effective block time or height for the entire
// transaction, we switch to using the semantics of nLockTime which
// is the last invalid block time or height. Thus we subtract 1 from
// the calculated time or height.
// Time-based relative lock-times are measured from the smallest
// allowed timestamp of the block containing the txout being spent,
// which is the median time past of the block prior.
nMinTime = std::max(
nMinTime,
nCoinTime +
(int64_t)((txin.nSequence & CTxIn::SEQUENCE_LOCKTIME_MASK)
<< CTxIn::SEQUENCE_LOCKTIME_GRANULARITY) -
1);
} else {
nMinHeight = std::max(
nMinHeight,
nCoinHeight +
(int)(txin.nSequence & CTxIn::SEQUENCE_LOCKTIME_MASK) - 1);
}
}
return std::make_pair(nMinHeight, nMinTime);
}
static bool EvaluateSequenceLocks(const CBlockIndex &block,
std::pair lockPair) {
assert(block.pprev);
int64_t nBlockTime = block.pprev->GetMedianTimePast();
if (lockPair.first >= block.nHeight || lockPair.second >= nBlockTime)
return false;
return true;
}
bool SequenceLocks(const CTransaction &tx, int flags,
std::vector *prevHeights, const CBlockIndex &block) {
return EvaluateSequenceLocks(
block, CalculateSequenceLocks(tx, flags, prevHeights, block));
}
bool TestLockPointValidity(const LockPoints *lp) {
AssertLockHeld(cs_main);
assert(lp);
// If there are relative lock times then the maxInputBlock will be set
// If there are no relative lock times, the LockPoints don't depend on the
// chain
if (lp->maxInputBlock) {
// Check whether chainActive is an extension of the block at which the
// LockPoints
// calculation was valid. If not LockPoints are no longer valid
if (!chainActive.Contains(lp->maxInputBlock)) {
return false;
}
}
// LockPoints still valid
return true;
}
bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints *lp,
bool useExistingLockPoints) {
AssertLockHeld(cs_main);
AssertLockHeld(mempool.cs);
CBlockIndex *tip = chainActive.Tip();
CBlockIndex index;
index.pprev = tip;
// CheckSequenceLocks() uses chainActive.Height()+1 to evaluate height based
// locks because when SequenceLocks() is called within ConnectBlock(), the
// height of the block *being* evaluated is what is used. Thus if we want to
// know if a transaction can be part of the *next* block, we need to use one
// more than chainActive.Height()
index.nHeight = tip->nHeight + 1;
std::pair lockPair;
if (useExistingLockPoints) {
assert(lp);
lockPair.first = lp->height;
lockPair.second = lp->time;
} else {
// pcoinsTip contains the UTXO set for chainActive.Tip()
CCoinsViewMemPool viewMemPool(pcoinsTip, mempool);
std::vector prevheights;
prevheights.resize(tx.vin.size());
for (size_t txinIndex = 0; txinIndex < tx.vin.size(); txinIndex++) {
const CTxIn &txin = tx.vin[txinIndex];
Coin coin;
if (!viewMemPool.GetCoin(txin.prevout, coin)) {
return error("%s: Missing input", __func__);
}
if (coin.GetHeight() == MEMPOOL_HEIGHT) {
// Assume all mempool transaction confirm in the next block
prevheights[txinIndex] = tip->nHeight + 1;
} else {
prevheights[txinIndex] = coin.GetHeight();
}
}
lockPair = CalculateSequenceLocks(tx, flags, &prevheights, index);
if (lp) {
lp->height = lockPair.first;
lp->time = lockPair.second;
// Also store the hash of the block with the highest height of all
// the blocks which have sequence locked prevouts. This hash needs
// to still be on the chain for these LockPoint calculations to be
// valid.
// Note: It is impossible to correctly calculate a maxInputBlock if
// any of the sequence locked inputs depend on unconfirmed txs,
// except in the special case where the relative lock time/height is
// 0, which is equivalent to no sequence lock. Since we assume input
// height of tip+1 for mempool txs and test the resulting lockPair
// from CalculateSequenceLocks against tip+1. We know
// EvaluateSequenceLocks will fail if there was a non-zero sequence
// lock on a mempool input, so we can use the return value of
// CheckSequenceLocks to indicate the LockPoints validity
int maxInputHeight = 0;
for (int height : prevheights) {
// Can ignore mempool inputs since we'll fail if they had
// non-zero locks
if (height != tip->nHeight + 1) {
maxInputHeight = std::max(maxInputHeight, height);
}
}
lp->maxInputBlock = tip->GetAncestor(maxInputHeight);
}
}
return EvaluateSequenceLocks(index, lockPair);
}
uint64_t GetSigOpCountWithoutP2SH(const CTransaction &tx) {
uint64_t nSigOps = 0;
for (const auto &txin : tx.vin) {
nSigOps += txin.scriptSig.GetSigOpCount(false);
}
for (const auto &txout : tx.vout) {
nSigOps += txout.scriptPubKey.GetSigOpCount(false);
}
return nSigOps;
}
uint64_t GetP2SHSigOpCount(const CTransaction &tx,
const CCoinsViewCache &inputs) {
if (tx.IsCoinBase()) {
return 0;
}
uint64_t nSigOps = 0;
for (auto &i : tx.vin) {
const CTxOut &prevout = inputs.GetOutputFor(i);
if (prevout.scriptPubKey.IsPayToScriptHash()) {
nSigOps += prevout.scriptPubKey.GetSigOpCount(i.scriptSig);
}
}
return nSigOps;
}
uint64_t GetTransactionSigOpCount(const CTransaction &tx,
const CCoinsViewCache &inputs, int flags) {
uint64_t nSigOps = GetSigOpCountWithoutP2SH(tx);
if (tx.IsCoinBase()) {
return nSigOps;
}
if (flags & SCRIPT_VERIFY_P2SH) {
nSigOps += GetP2SHSigOpCount(tx, inputs);
}
return nSigOps;
}
static bool CheckTransactionCommon(const CTransaction &tx,
CValidationState &state,
bool fCheckDuplicateInputs) {
// Basic checks that don't depend on any context
if (tx.vin.empty()) {
return state.DoS(10, false, REJECT_INVALID, "bad-txns-vin-empty");
}
if (tx.vout.empty()) {
return state.DoS(10, false, REJECT_INVALID, "bad-txns-vout-empty");
}
// Size limit
if (::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION) > MAX_TX_SIZE) {
return state.DoS(100, false, REJECT_INVALID, "bad-txns-oversize");
}
// Check for negative or overflow output values
Amount nValueOut(0);
for (const auto &txout : tx.vout) {
if (txout.nValue < Amount(0)) {
return state.DoS(100, false, REJECT_INVALID,
"bad-txns-vout-negative");
}
if (txout.nValue > MAX_MONEY) {
return state.DoS(100, false, REJECT_INVALID,
"bad-txns-vout-toolarge");
}
nValueOut += txout.nValue;
if (!MoneyRange(nValueOut)) {
return state.DoS(100, false, REJECT_INVALID,
"bad-txns-txouttotal-toolarge");
}
}
if (GetSigOpCountWithoutP2SH(tx) > MAX_TX_SIGOPS_COUNT) {
return state.DoS(100, false, REJECT_INVALID, "bad-txn-sigops");
}
// Check for duplicate inputs - note that this check is slow so we skip it
// in CheckBlock
if (fCheckDuplicateInputs) {
std::set vInOutPoints;
for (const auto &txin : tx.vin) {
if (!vInOutPoints.insert(txin.prevout).second) {
return state.DoS(100, false, REJECT_INVALID,
"bad-txns-inputs-duplicate");
}
}
}
return true;
}
bool CheckCoinbase(const CTransaction &tx, CValidationState &state,
bool fCheckDuplicateInputs) {
if (!tx.IsCoinBase()) {
return state.DoS(100, false, REJECT_INVALID, "bad-cb-missing", false,
"first tx is not coinbase");
}
if (!CheckTransactionCommon(tx, state, fCheckDuplicateInputs)) {
// CheckTransactionCommon fill in the state.
return false;
}
if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100) {
return state.DoS(100, false, REJECT_INVALID, "bad-cb-length");
}
return true;
}
bool CheckRegularTransaction(const CTransaction &tx, CValidationState &state,
bool fCheckDuplicateInputs) {
if (tx.IsCoinBase()) {
return state.DoS(100, false, REJECT_INVALID, "bad-tx-coinbase");
}
if (!CheckTransactionCommon(tx, state, fCheckDuplicateInputs)) {
// CheckTransactionCommon fill in the state.
return false;
}
for (const auto &txin : tx.vin) {
if (txin.prevout.IsNull()) {
return state.DoS(10, false, REJECT_INVALID,
"bad-txns-prevout-null");
}
}
return true;
}
static void LimitMempoolSize(CTxMemPool &pool, size_t limit,
unsigned long age) {
int expired = pool.Expire(GetTime() - age);
if (expired != 0) {
LogPrint(BCLog::MEMPOOL,
"Expired %i transactions from the memory pool\n", expired);
}
std::vector vNoSpendsRemaining;
pool.TrimToSize(limit, &vNoSpendsRemaining);
for (const COutPoint &removed : vNoSpendsRemaining) {
pcoinsTip->Uncache(removed);
}
}
/** Convert CValidationState to a human-readable message for logging */
std::string FormatStateMessage(const CValidationState &state) {
return strprintf(
"%s%s (code %i)", state.GetRejectReason(),
state.GetDebugMessage().empty() ? "" : ", " + state.GetDebugMessage(),
state.GetRejectCode());
}
static bool IsCurrentForFeeEstimation() {
AssertLockHeld(cs_main);
if (IsInitialBlockDownload()) {
return false;
}
if (chainActive.Tip()->GetBlockTime() <
(GetTime() - MAX_FEE_ESTIMATION_TIP_AGE)) {
return false;
}
if (chainActive.Height() < pindexBestHeader->nHeight - 1) {
return false;
}
return true;
}
static bool IsUAHFenabled(const Config &config, int nHeight) {
return nHeight >= config.GetChainParams().GetConsensus().uahfHeight;
}
bool IsUAHFenabled(const Config &config, const CBlockIndex *pindexPrev) {
if (pindexPrev == nullptr) {
return false;
}
return IsUAHFenabled(config, pindexPrev->nHeight);
}
static bool IsDAAEnabled(const Config &config, int nHeight) {
return nHeight >= config.GetChainParams().GetConsensus().daaHeight;
}
bool IsDAAEnabled(const Config &config, const CBlockIndex *pindexPrev) {
if (pindexPrev == nullptr) {
return false;
}
return IsDAAEnabled(config, pindexPrev->nHeight);
}
static bool IsMonolithEnabled(const Config &config, int64_t nMedianTimePast) {
return nMedianTimePast >=
- config.GetChainParams().GetConsensus().monolithActivationTime;
+ gArgs.GetArg(
+ "-monolithactivationtime",
+ config.GetChainParams().GetConsensus().monolithActivationTime);
}
bool IsMonolithEnabled(const Config &config, const CBlockIndex *pindexPrev) {
if (pindexPrev == nullptr) {
return false;
}
return IsMonolithEnabled(config, pindexPrev->GetMedianTimePast());
}
/**
* Make mempool consistent after a reorg, by re-adding or recursively erasing
* disconnected block transactions from the mempool, and also removing any other
* transactions from the mempool that are no longer valid given the new
* tip/height.
*
* Note: we assume that disconnectpool only contains transactions that are NOT
* confirmed in the current chain nor already in the mempool (otherwise,
* in-mempool descendants of such transactions would be removed).
*
* Passing fAddToMempool=false will skip trying to add the transactions back,
* and instead just erase from the mempool as needed.
*/
void UpdateMempoolForReorg(const Config &config,
DisconnectedBlockTransactions &disconnectpool,
bool fAddToMempool) {
AssertLockHeld(cs_main);
std::vector vHashUpdate;
// disconnectpool's insertion_order index sorts the entries from oldest to
// newest, but the oldest entry will be the last tx from the latest mined
// block that was disconnected.
// Iterate disconnectpool in reverse, so that we add transactions back to
// the mempool starting with the earliest transaction that had been
// previously seen in a block.
auto it = disconnectpool.queuedTx.get().rbegin();
while (it != disconnectpool.queuedTx.get().rend()) {
// ignore validation errors in resurrected transactions
CValidationState stateDummy;
if (!fAddToMempool || (*it)->IsCoinBase() ||
!AcceptToMemoryPool(config, mempool, stateDummy, *it, false,
nullptr, nullptr, true)) {
// If the transaction doesn't make it in to the mempool, remove any
// transactions that depend on it (which would now be orphans).
mempool.removeRecursive(**it, MemPoolRemovalReason::REORG);
} else if (mempool.exists((*it)->GetId())) {
vHashUpdate.push_back((*it)->GetId());
}
++it;
}
disconnectpool.queuedTx.clear();
// AcceptToMemoryPool/addUnchecked all assume that new mempool entries have
// no in-mempool children, which is generally not true when adding
// previously-confirmed transactions back to the mempool.
// UpdateTransactionsFromBlock finds descendants of any transactions in the
// disconnectpool that were added back and cleans up the mempool state.
mempool.UpdateTransactionsFromBlock(vHashUpdate);
// We also need to remove any now-immature transactions
mempool.removeForReorg(config, pcoinsTip, chainActive.Tip()->nHeight + 1,
STANDARD_LOCKTIME_VERIFY_FLAGS);
// Re-limit mempool size, in case we added any transactions
LimitMempoolSize(
mempool,
gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000,
gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
}
// Used to avoid mempool polluting consensus critical paths if CCoinsViewMempool
// were somehow broken and returning the wrong scriptPubKeys
static bool CheckInputsFromMempoolAndCache(const CTransaction &tx,
CValidationState &state,
const CCoinsViewCache &view,
CTxMemPool &pool, uint32_t flags,
bool cacheSigStore,
PrecomputedTransactionData &txdata) {
AssertLockHeld(cs_main);
// pool.cs should be locked already, but go ahead and re-take the lock here
// to enforce that mempool doesn't change between when we check the view and
// when we actually call through to CheckInputs
LOCK(pool.cs);
assert(!tx.IsCoinBase());
for (const CTxIn &txin : tx.vin) {
const Coin &coin = view.AccessCoin(txin.prevout);
// At this point we haven't actually checked if the coins are all
// available (or shouldn't assume we have, since CheckInputs does). So
// we just return failure if the inputs are not available here, and then
// only have to check equivalence for available inputs.
if (coin.IsSpent()) {
return false;
}
const CTransactionRef &txFrom = pool.get(txin.prevout.hash);
if (txFrom) {
assert(txFrom->GetHash() == txin.prevout.hash);
assert(txFrom->vout.size() > txin.prevout.n);
assert(txFrom->vout[txin.prevout.n] == coin.GetTxOut());
} else {
const Coin &coinFromDisk = pcoinsTip->AccessCoin(txin.prevout);
assert(!coinFromDisk.IsSpent());
assert(coinFromDisk.GetTxOut() == coin.GetTxOut());
}
}
return CheckInputs(tx, state, view, true, flags, cacheSigStore, true,
txdata);
}
static bool AcceptToMemoryPoolWorker(
const Config &config, CTxMemPool &pool, CValidationState &state,
const CTransactionRef &ptx, bool fLimitFree, bool *pfMissingInputs,
int64_t nAcceptTime, std::list *plTxnReplaced,
bool fOverrideMempoolLimit, const Amount nAbsurdFee,
std::vector &coins_to_uncache) {
AssertLockHeld(cs_main);
const CTransaction &tx = *ptx;
const uint256 txid = tx.GetId();
if (pfMissingInputs) {
*pfMissingInputs = false;
}
// Coinbase is only valid in a block, not as a loose transaction.
if (!CheckRegularTransaction(tx, state, true)) {
// state filled in by CheckRegularTransaction.
return false;
}
// Rather not work on nonstandard transactions (unless -testnet/-regtest)
std::string reason;
if (fRequireStandard && !IsStandardTx(tx, reason)) {
return state.DoS(0, false, REJECT_NONSTANDARD, reason);
}
// Only accept nLockTime-using transactions that can be mined in the next
// block; we don't want our mempool filled up with transactions that can't
// be mined yet.
CValidationState ctxState;
if (!ContextualCheckTransactionForCurrentBlock(
config, tx, ctxState, STANDARD_LOCKTIME_VERIFY_FLAGS)) {
// We copy the state from a dummy to ensure we don't increase the
// ban score of peer for transaction that could be valid in the future.
return state.DoS(
0, false, REJECT_NONSTANDARD, ctxState.GetRejectReason(),
ctxState.CorruptionPossible(), ctxState.GetDebugMessage());
}
// Is it already in the memory pool?
if (pool.exists(txid)) {
return state.Invalid(false, REJECT_ALREADY_KNOWN,
"txn-already-in-mempool");
}
// Check for conflicts with in-memory transactions
{
// Protect pool.mapNextTx
LOCK(pool.cs);
for (const CTxIn &txin : tx.vin) {
auto itConflicting = pool.mapNextTx.find(txin.prevout);
if (itConflicting != pool.mapNextTx.end()) {
// Disable replacement feature for good
return state.Invalid(false, REJECT_CONFLICT,
"txn-mempool-conflict");
}
}
}
{
CCoinsView dummy;
CCoinsViewCache view(&dummy);
Amount nValueIn(0);
LockPoints lp;
{
LOCK(pool.cs);
CCoinsViewMemPool viewMemPool(pcoinsTip, pool);
view.SetBackend(viewMemPool);
// Do we already have it?
for (size_t out = 0; out < tx.vout.size(); out++) {
COutPoint outpoint(txid, out);
bool had_coin_in_cache = pcoinsTip->HaveCoinInCache(outpoint);
if (view.HaveCoin(outpoint)) {
if (!had_coin_in_cache) {
coins_to_uncache.push_back(outpoint);
}
return state.Invalid(false, REJECT_ALREADY_KNOWN,
"txn-already-known");
}
}
// Do all inputs exist?
for (const CTxIn txin : tx.vin) {
if (!pcoinsTip->HaveCoinInCache(txin.prevout)) {
coins_to_uncache.push_back(txin.prevout);
}
if (!view.HaveCoin(txin.prevout)) {
if (pfMissingInputs) {
*pfMissingInputs = true;
}
// fMissingInputs and !state.IsInvalid() is used to detect
// this condition, don't set state.Invalid()
return false;
}
}
// Are the actual inputs available?
if (!view.HaveInputs(tx)) {
return state.Invalid(false, REJECT_DUPLICATE,
"bad-txns-inputs-spent");
}
// Bring the best block into scope.
view.GetBestBlock();
nValueIn = view.GetValueIn(tx);
// We have all inputs cached now, so switch back to dummy, so we
// don't need to keep lock on mempool.
view.SetBackend(dummy);
// Only accept BIP68 sequence locked transactions that can be mined
// in the next block; we don't want our mempool filled up with
// transactions that can't be mined yet. Must keep pool.cs for this
// unless we change CheckSequenceLocks to take a CoinsViewCache
// instead of create its own.
if (!CheckSequenceLocks(tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp)) {
return state.DoS(0, false, REJECT_NONSTANDARD,
"non-BIP68-final");
}
}
// Check for non-standard pay-to-script-hash in inputs
if (fRequireStandard && !AreInputsStandard(tx, view)) {
return state.Invalid(false, REJECT_NONSTANDARD,
"bad-txns-nonstandard-inputs");
}
int64_t nSigOpsCount =
GetTransactionSigOpCount(tx, view, STANDARD_SCRIPT_VERIFY_FLAGS);
Amount nValueOut = tx.GetValueOut();
Amount nFees = nValueIn - nValueOut;
// nModifiedFees includes any fee deltas from PrioritiseTransaction
Amount nModifiedFees = nFees;
double nPriorityDummy = 0;
pool.ApplyDeltas(txid, nPriorityDummy, nModifiedFees);
Amount inChainInputValue;
double dPriority =
view.GetPriority(tx, chainActive.Height(), inChainInputValue);
// Keep track of transactions that spend a coinbase, which we re-scan
// during reorgs to ensure COINBASE_MATURITY is still met.
bool fSpendsCoinbase = false;
for (const CTxIn &txin : tx.vin) {
const Coin &coin = view.AccessCoin(txin.prevout);
if (coin.IsCoinBase()) {
fSpendsCoinbase = true;
break;
}
}
CTxMemPoolEntry entry(ptx, nFees, nAcceptTime, dPriority,
chainActive.Height(), inChainInputValue,
fSpendsCoinbase, nSigOpsCount, lp);
unsigned int nSize = entry.GetTxSize();
// Check that the transaction doesn't have an excessive number of
// sigops, making it impossible to mine. Since the coinbase transaction
// itself can contain sigops MAX_STANDARD_TX_SIGOPS is less than
// MAX_BLOCK_SIGOPS_PER_MB; we still consider this an invalid rather
// than merely non-standard transaction.
if (nSigOpsCount > MAX_STANDARD_TX_SIGOPS) {
return state.DoS(0, false, REJECT_NONSTANDARD,
"bad-txns-too-many-sigops", false,
strprintf("%d", nSigOpsCount));
}
Amount mempoolRejectFee =
pool.GetMinFee(
gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) *
1000000)
.GetFee(nSize);
if (mempoolRejectFee > Amount(0) && nModifiedFees < mempoolRejectFee) {
return state.DoS(0, false, REJECT_INSUFFICIENTFEE,
"mempool min fee not met", false,
strprintf("%d < %d", nFees, mempoolRejectFee));
}
if (gArgs.GetBoolArg("-relaypriority", DEFAULT_RELAYPRIORITY) &&
nModifiedFees < ::minRelayTxFee.GetFee(nSize) &&
!AllowFree(entry.GetPriority(chainActive.Height() + 1))) {
// Require that free transactions have sufficient priority to be
// mined in the next block.
return state.DoS(0, false, REJECT_INSUFFICIENTFEE,
"insufficient priority");
}
// Continuously rate-limit free (really, very-low-fee) transactions.
// This mitigates 'penny-flooding' -- sending thousands of free
// transactions just to be annoying or make others' transactions take
// longer to confirm.
if (fLimitFree && nModifiedFees < ::minRelayTxFee.GetFee(nSize)) {
static CCriticalSection csFreeLimiter;
static double dFreeCount;
static int64_t nLastTime;
int64_t nNow = GetTime();
LOCK(csFreeLimiter);
// Use an exponentially decaying ~10-minute window:
dFreeCount *= pow(1.0 - 1.0 / 600.0, double(nNow - nLastTime));
nLastTime = nNow;
// -limitfreerelay unit is thousand-bytes-per-minute
// At default rate it would take over a month to fill 1GB
if (dFreeCount + nSize >=
gArgs.GetArg("-limitfreerelay", DEFAULT_LIMITFREERELAY) * 10 *
1000) {
return state.DoS(0, false, REJECT_INSUFFICIENTFEE,
"rate limited free transaction");
}
LogPrint(BCLog::MEMPOOL, "Rate limit dFreeCount: %g => %g\n",
dFreeCount, dFreeCount + nSize);
dFreeCount += nSize;
}
if (nAbsurdFee != Amount(0) && nFees > nAbsurdFee) {
return state.Invalid(false, REJECT_HIGHFEE, "absurdly-high-fee",
strprintf("%d > %d", nFees, nAbsurdFee));
}
// Calculate in-mempool ancestors, up to a limit.
CTxMemPool::setEntries setAncestors;
size_t nLimitAncestors =
gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
size_t nLimitAncestorSize =
gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT) *
1000;
size_t nLimitDescendants =
gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
size_t nLimitDescendantSize =
gArgs.GetArg("-limitdescendantsize",
DEFAULT_DESCENDANT_SIZE_LIMIT) *
1000;
std::string errString;
if (!pool.CalculateMemPoolAncestors(
entry, setAncestors, nLimitAncestors, nLimitAncestorSize,
nLimitDescendants, nLimitDescendantSize, errString)) {
return state.DoS(0, false, REJECT_NONSTANDARD,
"too-long-mempool-chain", false, errString);
}
uint32_t scriptVerifyFlags = STANDARD_SCRIPT_VERIFY_FLAGS;
if (!config.GetChainParams().RequireStandard()) {
scriptVerifyFlags =
SCRIPT_ENABLE_SIGHASH_FORKID |
gArgs.GetArg("-promiscuousmempoolflags", scriptVerifyFlags);
}
// Check against previous transactions. This is done last to help
// prevent CPU exhaustion denial-of-service attacks.
PrecomputedTransactionData txdata(tx);
if (!CheckInputs(tx, state, view, true, scriptVerifyFlags, true, false,
txdata)) {
// State filled in by CheckInputs.
return false;
}
// Check again against the current block tip's script verification flags
// to cache our script execution flags. This is, of course, useless if
// the next block has different script flags from the previous one, but
// because the cache tracks script flags for us it will auto-invalidate
// and we'll just have a few blocks of extra misses on soft-fork
// activation.
//
// This is also useful in case of bugs in the standard flags that cause
// transactions to pass as valid when they're actually invalid. For
// instance the STRICTENC flag was incorrectly allowing certain CHECKSIG
// NOT scripts to pass, even though they were invalid.
//
// There is a similar check in CreateNewBlock() to prevent creating
// invalid blocks (using TestBlockValidity), however allowing such
// transactions into the mempool can be exploited as a DoS attack.
uint32_t currentBlockScriptVerifyFlags =
GetBlockScriptFlags(chainActive.Tip(), config);
if (!CheckInputsFromMempoolAndCache(tx, state, view, pool,
currentBlockScriptVerifyFlags, true,
txdata)) {
// If we're using promiscuousmempoolflags, we may hit this normally.
// Check if current block has some flags that scriptVerifyFlags does
// not before printing an ominous warning.
if (!(~scriptVerifyFlags & currentBlockScriptVerifyFlags)) {
return error(
"%s: BUG! PLEASE REPORT THIS! ConnectInputs failed against "
"MANDATORY but not STANDARD flags %s, %s",
__func__, txid.ToString(), FormatStateMessage(state));
}
if (!CheckInputs(tx, state, view, true,
MANDATORY_SCRIPT_VERIFY_FLAGS, true, false,
txdata)) {
return error(
"%s: ConnectInputs failed against MANDATORY but not "
"STANDARD flags due to promiscuous mempool %s, %s",
__func__, txid.ToString(), FormatStateMessage(state));
}
LogPrintf("Warning: -promiscuousmempool flags set to not include "
"currently enforced soft forks, this may break mining or "
"otherwise cause instability!\n");
}
// This transaction should only count for fee estimation if
// the node is not behind and it is not dependent on any other
// transactions in the mempool.
bool validForFeeEstimation =
IsCurrentForFeeEstimation() && pool.HasNoInputsOf(tx);
// Store transaction in memory.
pool.addUnchecked(txid, entry, setAncestors, validForFeeEstimation);
// Trim mempool and check if tx was trimmed.
if (!fOverrideMempoolLimit) {
LimitMempoolSize(
pool,
gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000,
gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 *
60);
if (!pool.exists(txid)) {
return state.DoS(0, false, REJECT_INSUFFICIENTFEE,
"mempool full");
}
}
}
GetMainSignals().TransactionAddedToMempool(ptx);
return true;
}
/**
* (try to) add transaction to memory pool with a specified acceptance time.
*/
static bool AcceptToMemoryPoolWithTime(
const Config &config, CTxMemPool &pool, CValidationState &state,
const CTransactionRef &tx, bool fLimitFree, bool *pfMissingInputs,
int64_t nAcceptTime, std::list *plTxnReplaced = nullptr,
bool fOverrideMempoolLimit = false, const Amount nAbsurdFee = Amount(0)) {
std::vector coins_to_uncache;
bool res = AcceptToMemoryPoolWorker(
config, pool, state, tx, fLimitFree, pfMissingInputs, nAcceptTime,
plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee, coins_to_uncache);
if (!res) {
for (const COutPoint &outpoint : coins_to_uncache) {
pcoinsTip->Uncache(outpoint);
}
}
// After we've (potentially) uncached entries, ensure our coins cache is
// still within its size limits
CValidationState stateDummy;
FlushStateToDisk(config.GetChainParams(), stateDummy, FLUSH_STATE_PERIODIC);
return res;
}
bool AcceptToMemoryPool(const Config &config, CTxMemPool &pool,
CValidationState &state, const CTransactionRef &tx,
bool fLimitFree, bool *pfMissingInputs,
std::list *plTxnReplaced,
bool fOverrideMempoolLimit, const Amount nAbsurdFee) {
return AcceptToMemoryPoolWithTime(config, pool, state, tx, fLimitFree,
pfMissingInputs, GetTime(), plTxnReplaced,
fOverrideMempoolLimit, nAbsurdFee);
}
/** Return transaction in txOut, and if it was found inside a block, its hash is
* placed in hashBlock */
bool GetTransaction(const Config &config, const uint256 &txid,
CTransactionRef &txOut, uint256 &hashBlock,
bool fAllowSlow) {
CBlockIndex *pindexSlow = nullptr;
LOCK(cs_main);
CTransactionRef ptx = mempool.get(txid);
if (ptx) {
txOut = ptx;
return true;
}
if (fTxIndex) {
CDiskTxPos postx;
if (pblocktree->ReadTxIndex(txid, postx)) {
CAutoFile file(OpenBlockFile(postx, true), SER_DISK,
CLIENT_VERSION);
if (file.IsNull())
return error("%s: OpenBlockFile failed", __func__);
CBlockHeader header;
try {
file >> header;
fseek(file.Get(), postx.nTxOffset, SEEK_CUR);
file >> txOut;
} catch (const std::exception &e) {
return error("%s: Deserialize or I/O error - %s", __func__,
e.what());
}
hashBlock = header.GetHash();
if (txOut->GetId() != txid)
return error("%s: txid mismatch", __func__);
return true;
}
}
// use coin database to locate block that contains transaction, and scan it
if (fAllowSlow) {
const Coin &coin = AccessByTxid(*pcoinsTip, txid);
if (!coin.IsSpent()) {
pindexSlow = chainActive[coin.GetHeight()];
}
}
if (pindexSlow) {
CBlock block;
if (ReadBlockFromDisk(block, pindexSlow, config)) {
for (const auto &tx : block.vtx) {
if (tx->GetId() == txid) {
txOut = tx;
hashBlock = pindexSlow->GetBlockHash();
return true;
}
}
}
}
return false;
}
//////////////////////////////////////////////////////////////////////////////
//
// CBlock and CBlockIndex
//
static bool WriteBlockToDisk(const CBlock &block, CDiskBlockPos &pos,
const CMessageHeader::MessageMagic &messageStart) {
// Open history file to append
CAutoFile fileout(OpenBlockFile(pos), SER_DISK, CLIENT_VERSION);
if (fileout.IsNull()) {
return error("WriteBlockToDisk: OpenBlockFile failed");
}
// Write index header
unsigned int nSize = GetSerializeSize(fileout, block);
fileout << FLATDATA(messageStart) << nSize;
// Write block
long fileOutPos = ftell(fileout.Get());
if (fileOutPos < 0) {
return error("WriteBlockToDisk: ftell failed");
}
pos.nPos = (unsigned int)fileOutPos;
fileout << block;
return true;
}
bool ReadBlockFromDisk(CBlock &block, const CDiskBlockPos &pos,
const Config &config) {
block.SetNull();
// Open history file to read
CAutoFile filein(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION);
if (filein.IsNull()) {
return error("ReadBlockFromDisk: OpenBlockFile failed for %s",
pos.ToString());
}
// Read block
try {
filein >> block;
} catch (const std::exception &e) {
return error("%s: Deserialize or I/O error - %s at %s", __func__,
e.what(), pos.ToString());
}
// Check the header
if (!CheckProofOfWork(block.GetHash(), block.nBits, config)) {
return error("ReadBlockFromDisk: Errors in block header at %s",
pos.ToString());
}
return true;
}
bool ReadBlockFromDisk(CBlock &block, const CBlockIndex *pindex,
const Config &config) {
if (!ReadBlockFromDisk(block, pindex->GetBlockPos(), config)) {
return false;
}
if (block.GetHash() != pindex->GetBlockHash()) {
return error("ReadBlockFromDisk(CBlock&, CBlockIndex*): GetHash() "
"doesn't match index for %s at %s",
pindex->ToString(), pindex->GetBlockPos().ToString());
}
return true;
}
Amount GetBlockSubsidy(int nHeight, const Consensus::Params &consensusParams) {
int halvings = nHeight / consensusParams.nSubsidyHalvingInterval;
// Force block reward to zero when right shift is undefined.
if (halvings >= 64) return Amount(0);
Amount nSubsidy = 50 * COIN;
// Subsidy is cut in half every 210,000 blocks which will occur
// approximately every 4 years.
return Amount(nSubsidy.GetSatoshis() >> halvings);
}
bool IsInitialBlockDownload() {
// Once this function has returned false, it must remain false.
static std::atomic latchToFalse{false};
// Optimization: pre-test latch before taking the lock.
if (latchToFalse.load(std::memory_order_relaxed)) return false;
LOCK(cs_main);
if (latchToFalse.load(std::memory_order_relaxed)) return false;
if (fImporting || fReindex) return true;
if (chainActive.Tip() == nullptr) return true;
if (chainActive.Tip()->nChainWork < nMinimumChainWork) return true;
if (chainActive.Tip()->GetBlockTime() < (GetTime() - nMaxTipAge))
return true;
LogPrintf("Leaving InitialBlockDownload (latching to false)\n");
latchToFalse.store(true, std::memory_order_relaxed);
return false;
}
CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr;
static void AlertNotify(const std::string &strMessage) {
uiInterface.NotifyAlertChanged();
std::string strCmd = gArgs.GetArg("-alertnotify", "");
if (strCmd.empty()) return;
// Alert text should be plain ascii coming from a trusted source, but to be
// safe we first strip anything not in safeChars, then add single quotes
// around the whole string before passing it to the shell:
std::string singleQuote("'");
std::string safeStatus = SanitizeString(strMessage);
safeStatus = singleQuote + safeStatus + singleQuote;
boost::replace_all(strCmd, "%s", safeStatus);
boost::thread t(runCommand, strCmd); // thread runs free
}
static void CheckForkWarningConditions() {
AssertLockHeld(cs_main);
// Before we get past initial download, we cannot reliably alert about forks
// (we assume we don't get stuck on a fork before finishing our initial
// sync)
if (IsInitialBlockDownload()) return;
// If our best fork is no longer within 72 blocks (+/- 12 hours if no one
// mines it) of our head, drop it
if (pindexBestForkTip &&
chainActive.Height() - pindexBestForkTip->nHeight >= 72)
pindexBestForkTip = nullptr;
if (pindexBestForkTip ||
(pindexBestInvalid &&
pindexBestInvalid->nChainWork >
chainActive.Tip()->nChainWork +
(GetBlockProof(*chainActive.Tip()) * 6))) {
if (!GetfLargeWorkForkFound() && pindexBestForkBase) {
std::string warning =
std::string("'Warning: Large-work fork detected, forking after "
"block ") +
pindexBestForkBase->phashBlock->ToString() + std::string("'");
AlertNotify(warning);
}
if (pindexBestForkTip && pindexBestForkBase) {
LogPrintf("%s: Warning: Large valid fork found\n forking the "
"chain at height %d (%s)\n lasting to height %d "
"(%s).\nChain state database corruption likely.\n",
__func__, pindexBestForkBase->nHeight,
pindexBestForkBase->phashBlock->ToString(),
pindexBestForkTip->nHeight,
pindexBestForkTip->phashBlock->ToString());
SetfLargeWorkForkFound(true);
} else {
LogPrintf("%s: Warning: Found invalid chain at least ~6 blocks "
"longer than our best chain.\nChain state database "
"corruption likely.\n",
__func__);
SetfLargeWorkInvalidChainFound(true);
}
} else {
SetfLargeWorkForkFound(false);
SetfLargeWorkInvalidChainFound(false);
}
}
static void CheckForkWarningConditionsOnNewFork(CBlockIndex *pindexNewForkTip) {
AssertLockHeld(cs_main);
// If we are on a fork that is sufficiently large, set a warning flag
CBlockIndex *pfork = pindexNewForkTip;
CBlockIndex *plonger = chainActive.Tip();
while (pfork && pfork != plonger) {
while (plonger && plonger->nHeight > pfork->nHeight)
plonger = plonger->pprev;
if (pfork == plonger) break;
pfork = pfork->pprev;
}
// We define a condition where we should warn the user about as a fork of at
// least 7 blocks with a tip within 72 blocks (+/- 12 hours if no one mines
// it) of ours. We use 7 blocks rather arbitrarily as it represents just
// under 10% of sustained network hash rate operating on the fork, or a
// chain that is entirely longer than ours and invalid (note that this
// should be detected by both). We define it this way because it allows us
// to only store the highest fork tip (+ base) which meets the 7-block
// condition and from this always have the most-likely-to-cause-warning fork
if (pfork && (!pindexBestForkTip ||
(pindexBestForkTip &&
pindexNewForkTip->nHeight > pindexBestForkTip->nHeight)) &&
pindexNewForkTip->nChainWork - pfork->nChainWork >
(GetBlockProof(*pfork) * 7) &&
chainActive.Height() - pindexNewForkTip->nHeight < 72) {
pindexBestForkTip = pindexNewForkTip;
pindexBestForkBase = pfork;
}
CheckForkWarningConditions();
}
static void InvalidChainFound(CBlockIndex *pindexNew) {
if (!pindexBestInvalid ||
pindexNew->nChainWork > pindexBestInvalid->nChainWork)
pindexBestInvalid = pindexNew;
LogPrintf(
"%s: invalid block=%s height=%d log2_work=%.8g date=%s\n", __func__,
pindexNew->GetBlockHash().ToString(), pindexNew->nHeight,
log(pindexNew->nChainWork.getdouble()) / log(2.0),
DateTimeStrFormat("%Y-%m-%d %H:%M:%S", pindexNew->GetBlockTime()));
CBlockIndex *tip = chainActive.Tip();
assert(tip);
LogPrintf("%s: current best=%s height=%d log2_work=%.8g date=%s\n",
__func__, tip->GetBlockHash().ToString(), chainActive.Height(),
log(tip->nChainWork.getdouble()) / log(2.0),
DateTimeStrFormat("%Y-%m-%d %H:%M:%S", tip->GetBlockTime()));
CheckForkWarningConditions();
}
static void InvalidBlockFound(CBlockIndex *pindex,
const CValidationState &state) {
if (!state.CorruptionPossible()) {
pindex->nStatus |= BLOCK_FAILED_VALID;
setDirtyBlockIndex.insert(pindex);
setBlockIndexCandidates.erase(pindex);
InvalidChainFound(pindex);
}
}
void UpdateCoins(const CTransaction &tx, CCoinsViewCache &inputs,
CTxUndo &txundo, int nHeight) {
// Mark inputs spent.
if (!tx.IsCoinBase()) {
txundo.vprevout.reserve(tx.vin.size());
for (const CTxIn &txin : tx.vin) {
txundo.vprevout.emplace_back();
bool is_spent =
inputs.SpendCoin(txin.prevout, &txundo.vprevout.back());
assert(is_spent);
}
}
// Add outputs.
AddCoins(inputs, tx, nHeight);
}
void UpdateCoins(const CTransaction &tx, CCoinsViewCache &inputs, int nHeight) {
CTxUndo txundo;
UpdateCoins(tx, inputs, txundo, nHeight);
}
bool CScriptCheck::operator()() {
const CScript &scriptSig = ptxTo->vin[nIn].scriptSig;
return VerifyScript(scriptSig, scriptPubKey, nFlags,
CachingTransactionSignatureChecker(ptxTo, nIn, amount,
cacheStore, txdata),
&error);
}
int GetSpendHeight(const CCoinsViewCache &inputs) {
LOCK(cs_main);
CBlockIndex *pindexPrev = mapBlockIndex.find(inputs.GetBestBlock())->second;
return pindexPrev->nHeight + 1;
}
namespace Consensus {
bool CheckTxInputs(const CTransaction &tx, CValidationState &state,
const CCoinsViewCache &inputs, int nSpendHeight) {
// This doesn't trigger the DoS code on purpose; if it did, it would make it
// easier for an attacker to attempt to split the network.
if (!inputs.HaveInputs(tx)) {
return state.Invalid(false, 0, "", "Inputs unavailable");
}
Amount nValueIn(0);
Amount nFees(0);
for (size_t i = 0; i < tx.vin.size(); i++) {
const COutPoint &prevout = tx.vin[i].prevout;
const Coin &coin = inputs.AccessCoin(prevout);
assert(!coin.IsSpent());
// If prev is coinbase, check that it's matured
if (coin.IsCoinBase()) {
if (nSpendHeight - coin.GetHeight() < COINBASE_MATURITY) {
return state.Invalid(
false, REJECT_INVALID,
"bad-txns-premature-spend-of-coinbase",
strprintf("tried to spend coinbase at depth %d",
nSpendHeight - coin.GetHeight()));
}
}
// Check for negative or overflow input values
nValueIn += coin.GetTxOut().nValue;
if (!MoneyRange(coin.GetTxOut().nValue) || !MoneyRange(nValueIn)) {
return state.DoS(100, false, REJECT_INVALID,
"bad-txns-inputvalues-outofrange");
}
}
if (nValueIn < tx.GetValueOut()) {
return state.DoS(100, false, REJECT_INVALID, "bad-txns-in-belowout",
false, strprintf("value in (%s) < value out (%s)",
FormatMoney(nValueIn),
FormatMoney(tx.GetValueOut())));
}
// Tally transaction fees
Amount nTxFee = nValueIn - tx.GetValueOut();
if (nTxFee < Amount(0)) {
return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-negative");
}
nFees += nTxFee;
if (!MoneyRange(nFees)) {
return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-outofrange");
}
return true;
}
} // namespace Consensus
bool CheckInputs(const CTransaction &tx, CValidationState &state,
const CCoinsViewCache &inputs, bool fScriptChecks,
uint32_t flags, bool sigCacheStore, bool scriptCacheStore,
const PrecomputedTransactionData &txdata,
std::vector *pvChecks) {
assert(!tx.IsCoinBase());
if (!Consensus::CheckTxInputs(tx, state, inputs, GetSpendHeight(inputs))) {
return false;
}
if (pvChecks) {
pvChecks->reserve(tx.vin.size());
}
// The first loop above does all the inexpensive checks. Only if ALL inputs
// pass do we perform expensive ECDSA signature checks. Helps prevent CPU
// exhaustion attacks.
// Skip script verification when connecting blocks under the assumedvalid
// block. Assuming the assumedvalid block is valid this is safe because
// block merkle hashes are still computed and checked, of course, if an
// assumed valid block is invalid due to false scriptSigs this optimization
// would allow an invalid chain to be accepted.
if (!fScriptChecks) {
return true;
}
// First check if script executions have been cached with the same flags.
// Note that this assumes that the inputs provided are correct (ie that the
// transaction hash which is in tx's prevouts properly commits to the
// scriptPubKey in the inputs view of that transaction).
uint256 hashCacheEntry = GetScriptCacheKey(tx, flags);
if (IsKeyInScriptCache(hashCacheEntry, !scriptCacheStore)) {
return true;
}
for (size_t i = 0; i < tx.vin.size(); i++) {
const COutPoint &prevout = tx.vin[i].prevout;
const Coin &coin = inputs.AccessCoin(prevout);
assert(!coin.IsSpent());
// We very carefully only pass in things to CScriptCheck which are
// clearly committed to by tx' witness hash. This provides a sanity
// check that our caching is not introducing consensus failures through
// additional data in, eg, the coins being spent being checked as a part
// of CScriptCheck.
const CScript &scriptPubKey = coin.GetTxOut().scriptPubKey;
const Amount amount = coin.GetTxOut().nValue;
// Verify signature
CScriptCheck check(scriptPubKey, amount, tx, i, flags, sigCacheStore,
txdata);
if (pvChecks) {
pvChecks->push_back(std::move(check));
} else if (!check()) {
if (flags & STANDARD_NOT_MANDATORY_VERIFY_FLAGS) {
// Check whether the failure was caused by a non-mandatory
// script verification check, such as non-standard DER encodings
// or non-null dummy arguments; if so, don't trigger DoS
// protection to avoid splitting the network between upgraded
// and non-upgraded nodes.
CScriptCheck check2(scriptPubKey, amount, tx, i,
flags &
~STANDARD_NOT_MANDATORY_VERIFY_FLAGS,
sigCacheStore, txdata);
if (check2()) {
return state.Invalid(
false, REJECT_NONSTANDARD,
strprintf("non-mandatory-script-verify-flag (%s)",
ScriptErrorString(check.GetScriptError())));
}
}
// Failures of other flags indicate a transaction that is invalid in
// new blocks, e.g. a invalid P2SH. We DoS ban such nodes as they
// are not following the protocol. That said during an upgrade
// careful thought should be taken as to the correct behavior - we
// may want to continue peering with non-upgraded nodes even after
// soft-fork super-majority signaling has occurred.
return state.DoS(
100, false, REJECT_INVALID,
strprintf("mandatory-script-verify-flag-failed (%s)",
ScriptErrorString(check.GetScriptError())));
}
}
if (scriptCacheStore && !pvChecks) {
// We executed all of the provided scripts, and were told to cache the
// result. Do so now.
AddKeyInScriptCache(hashCacheEntry);
}
return true;
}
namespace {
bool UndoWriteToDisk(const CBlockUndo &blockundo, CDiskBlockPos &pos,
const uint256 &hashBlock,
const CMessageHeader::MessageMagic &messageStart) {
// Open history file to append
CAutoFile fileout(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION);
if (fileout.IsNull()) return error("%s: OpenUndoFile failed", __func__);
// Write index header
unsigned int nSize = GetSerializeSize(fileout, blockundo);
fileout << FLATDATA(messageStart) << nSize;
// Write undo data
long fileOutPos = ftell(fileout.Get());
if (fileOutPos < 0) return error("%s: ftell failed", __func__);
pos.nPos = (unsigned int)fileOutPos;
fileout << blockundo;
// calculate & write checksum
CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION);
hasher << hashBlock;
hasher << blockundo;
fileout << hasher.GetHash();
return true;
}
bool UndoReadFromDisk(CBlockUndo &blockundo, const CDiskBlockPos &pos,
const uint256 &hashBlock) {
// Open history file to read
CAutoFile filein(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION);
if (filein.IsNull()) {
return error("%s: OpenUndoFile failed", __func__);
}
// Read block
uint256 hashChecksum;
// We need a CHashVerifier as reserializing may lose data
CHashVerifier verifier(&filein);
try {
verifier << hashBlock;
verifier >> blockundo;
filein >> hashChecksum;
} catch (const std::exception &e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
// Verify checksum
if (hashChecksum != verifier.GetHash()) {
return error("%s: Checksum mismatch", __func__);
}
return true;
}
/** Abort with a message */
bool AbortNode(const std::string &strMessage,
const std::string &userMessage = "") {
SetMiscWarning(strMessage);
LogPrintf("*** %s\n", strMessage);
uiInterface.ThreadSafeMessageBox(
userMessage.empty() ? _("Error: A fatal internal error occurred, see "
"debug.log for details")
: userMessage,
"", CClientUIInterface::MSG_ERROR);
StartShutdown();
return false;
}
bool AbortNode(CValidationState &state, const std::string &strMessage,
const std::string &userMessage = "") {
AbortNode(strMessage, userMessage);
return state.Error(strMessage);
}
} // namespace
/** Restore the UTXO in a Coin at a given COutPoint. */
DisconnectResult UndoCoinSpend(const Coin &undo, CCoinsViewCache &view,
const COutPoint &out) {
bool fClean = true;
if (view.HaveCoin(out)) {
// Overwriting transaction output.
fClean = false;
}
if (undo.GetHeight() == 0) {
// Missing undo metadata (height and coinbase). Older versions included
// this information only in undo records for the last spend of a
// transactions' outputs. This implies that it must be present for some
// other output of the same tx.
const Coin &alternate = AccessByTxid(view, out.hash);
if (alternate.IsSpent()) {
// Adding output for transaction without known metadata
return DISCONNECT_FAILED;
}
// This is somewhat ugly, but hopefully utility is limited. This is only
// useful when working from legacy on disck data. In any case, putting
// the correct information in there doesn't hurt.
const_cast(undo) = Coin(undo.GetTxOut(), alternate.GetHeight(),
alternate.IsCoinBase());
}
// The potential_overwrite parameter to AddCoin is only allowed to be false
// if we know for sure that the coin did not already exist in the cache. As
// we have queried for that above using HaveCoin, we don't need to guess.
// When fClean is false, a coin already existed and it is an overwrite.
view.AddCoin(out, std::move(undo), !fClean);
return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN;
}
/**
* Undo the effects of this block (with given index) on the UTXO set represented
* by coins. When FAILED is returned, view is left in an indeterminate state.
*/
static DisconnectResult DisconnectBlock(const CBlock &block,
const CBlockIndex *pindex,
CCoinsViewCache &view) {
CBlockUndo blockUndo;
CDiskBlockPos pos = pindex->GetUndoPos();
if (pos.IsNull()) {
error("DisconnectBlock(): no undo data available");
return DISCONNECT_FAILED;
}
if (!UndoReadFromDisk(blockUndo, pos, pindex->pprev->GetBlockHash())) {
error("DisconnectBlock(): failure reading undo data");
return DISCONNECT_FAILED;
}
return ApplyBlockUndo(blockUndo, block, pindex, view);
}
DisconnectResult ApplyBlockUndo(const CBlockUndo &blockUndo,
const CBlock &block, const CBlockIndex *pindex,
CCoinsViewCache &view) {
bool fClean = true;
if (blockUndo.vtxundo.size() + 1 != block.vtx.size()) {
error("DisconnectBlock(): block and undo data inconsistent");
return DISCONNECT_FAILED;
}
// Undo transactions in reverse order.
size_t i = block.vtx.size();
while (i-- > 0) {
const CTransaction &tx = *(block.vtx[i]);
uint256 txid = tx.GetId();
// Check that all outputs are available and match the outputs in the
// block itself exactly.
for (size_t o = 0; o < tx.vout.size(); o++) {
if (tx.vout[o].scriptPubKey.IsUnspendable()) {
continue;
}
COutPoint out(txid, o);
Coin coin;
bool is_spent = view.SpendCoin(out, &coin);
if (!is_spent || tx.vout[o] != coin.GetTxOut()) {
// transaction output mismatch
fClean = false;
}
}
// Restore inputs.
if (i < 1) {
// Skip the coinbase.
continue;
}
const CTxUndo &txundo = blockUndo.vtxundo[i - 1];
if (txundo.vprevout.size() != tx.vin.size()) {
error("DisconnectBlock(): transaction and undo data inconsistent");
return DISCONNECT_FAILED;
}
for (size_t j = tx.vin.size(); j-- > 0;) {
const COutPoint &out = tx.vin[j].prevout;
const Coin &undo = txundo.vprevout[j];
DisconnectResult res = UndoCoinSpend(undo, view, out);
if (res == DISCONNECT_FAILED) {
return DISCONNECT_FAILED;
}
fClean = fClean && res != DISCONNECT_UNCLEAN;
}
}
// Move best block pointer to previous block.
view.SetBestBlock(block.hashPrevBlock);
return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN;
}
static void FlushBlockFile(bool fFinalize = false) {
LOCK(cs_LastBlockFile);
CDiskBlockPos posOld(nLastBlockFile, 0);
FILE *fileOld = OpenBlockFile(posOld);
if (fileOld) {
if (fFinalize)
TruncateFile(fileOld, vinfoBlockFile[nLastBlockFile].nSize);
FileCommit(fileOld);
fclose(fileOld);
}
fileOld = OpenUndoFile(posOld);
if (fileOld) {
if (fFinalize)
TruncateFile(fileOld, vinfoBlockFile[nLastBlockFile].nUndoSize);
FileCommit(fileOld);
fclose(fileOld);
}
}
static bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos,
unsigned int nAddSize);
static CCheckQueue scriptcheckqueue(128);
void ThreadScriptCheck() {
RenameThread("bitcoin-scriptch");
scriptcheckqueue.Thread();
}
// Protected by cs_main
VersionBitsCache versionbitscache;
int32_t ComputeBlockVersion(const CBlockIndex *pindexPrev,
const Consensus::Params ¶ms) {
LOCK(cs_main);
int32_t nVersion = VERSIONBITS_TOP_BITS;
for (int i = 0; i < (int)Consensus::MAX_VERSION_BITS_DEPLOYMENTS; i++) {
ThresholdState state = VersionBitsState(
pindexPrev, params, (Consensus::DeploymentPos)i, versionbitscache);
if (state == THRESHOLD_LOCKED_IN || state == THRESHOLD_STARTED) {
nVersion |= VersionBitsMask(params, (Consensus::DeploymentPos)i);
}
}
return nVersion;
}
/**
* Threshold condition checker that triggers when unknown versionbits are seen
* on the network.
*/
class WarningBitsConditionChecker : public AbstractThresholdConditionChecker {
private:
int bit;
public:
WarningBitsConditionChecker(int bitIn) : bit(bitIn) {}
int64_t BeginTime(const Consensus::Params ¶ms) const override {
return 0;
}
int64_t EndTime(const Consensus::Params ¶ms) const override {
return std::numeric_limits::max();
}
int Period(const Consensus::Params ¶ms) const override {
return params.nMinerConfirmationWindow;
}
int Threshold(const Consensus::Params ¶ms) const override {
return params.nRuleChangeActivationThreshold;
}
bool Condition(const CBlockIndex *pindex,
const Consensus::Params ¶ms) const override {
return ((pindex->nVersion & VERSIONBITS_TOP_MASK) ==
VERSIONBITS_TOP_BITS) &&
((pindex->nVersion >> bit) & 1) != 0 &&
((ComputeBlockVersion(pindex->pprev, params) >> bit) & 1) == 0;
}
};
// Protected by cs_main
static ThresholdConditionCache warningcache[VERSIONBITS_NUM_BITS];
// Returns the script flags which should be checked for a given block
static uint32_t GetBlockScriptFlags(const CBlockIndex *pindex,
const Config &config) {
AssertLockHeld(cs_main);
const Consensus::Params &consensusparams =
config.GetChainParams().GetConsensus();
// BIP16 didn't become active until Apr 1 2012
int64_t nBIP16SwitchTime = 1333238400;
bool fStrictPayToScriptHash = (pindex->GetBlockTime() >= nBIP16SwitchTime);
uint32_t flags =
fStrictPayToScriptHash ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE;
// Start enforcing the DERSIG (BIP66) rule
if (pindex->nHeight >= consensusparams.BIP66Height) {
flags |= SCRIPT_VERIFY_DERSIG;
}
// Start enforcing CHECKLOCKTIMEVERIFY (BIP65) rule
if (pindex->nHeight >= consensusparams.BIP65Height) {
flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
}
// Start enforcing BIP112 (CHECKSEQUENCEVERIFY) using versionbits logic.
if (VersionBitsState(pindex->pprev, consensusparams,
Consensus::DEPLOYMENT_CSV,
versionbitscache) == THRESHOLD_ACTIVE) {
flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
}
// If the UAHF is enabled, we start accepting replay protected txns
if (IsUAHFenabled(config, pindex->pprev)) {
flags |= SCRIPT_VERIFY_STRICTENC;
flags |= SCRIPT_ENABLE_SIGHASH_FORKID;
}
// If the DAA HF is enabled, we start rejecting transaction that use a high
// s in their signature. We also make sure that signature that are supposed
// to fail (for instance in multisig or other forms of smart contracts) are
// null.
if (IsDAAEnabled(config, pindex->pprev)) {
flags |= SCRIPT_VERIFY_LOW_S;
flags |= SCRIPT_VERIFY_NULLFAIL;
}
return flags;
}
static int64_t nTimeCheck = 0;
static int64_t nTimeForks = 0;
static int64_t nTimeVerify = 0;
static int64_t nTimeConnect = 0;
static int64_t nTimeIndex = 0;
static int64_t nTimeCallbacks = 0;
static int64_t nTimeTotal = 0;
/**
* Apply the effects of this block (with given index) on the UTXO set
* represented by coins. Validity checks that depend on the UTXO set are also
* done; ConnectBlock() can fail if those validity checks fail (among other
* reasons).
*/
static bool ConnectBlock(const Config &config, const CBlock &block,
CValidationState &state, CBlockIndex *pindex,
CCoinsViewCache &view, bool fJustCheck = false) {
AssertLockHeld(cs_main);
int64_t nTimeStart = GetTimeMicros();
// Check it again in case a previous version let a bad block in
if (!CheckBlock(config, block, state, !fJustCheck, !fJustCheck)) {
return error("%s: Consensus::CheckBlock: %s", __func__,
FormatStateMessage(state));
}
// Verify that the view's current state corresponds to the previous block
uint256 hashPrevBlock =
pindex->pprev == nullptr ? uint256() : pindex->pprev->GetBlockHash();
assert(hashPrevBlock == view.GetBestBlock());
// Special case for the genesis block, skipping connection of its
// transactions (its coinbase is unspendable)
const Consensus::Params &consensusParams =
config.GetChainParams().GetConsensus();
if (block.GetHash() == consensusParams.hashGenesisBlock) {
if (!fJustCheck) {
view.SetBestBlock(pindex->GetBlockHash());
}
return true;
}
bool fScriptChecks = true;
if (!hashAssumeValid.IsNull()) {
// We've been configured with the hash of a block which has been
// externally verified to have a valid history. A suitable default value
// is included with the software and updated from time to time. Because
// validity relative to a piece of software is an objective fact these
// defaults can be easily reviewed. This setting doesn't force the
// selection of any particular chain but makes validating some faster by
// effectively caching the result of part of the verification.
BlockMap::const_iterator it = mapBlockIndex.find(hashAssumeValid);
if (it != mapBlockIndex.end()) {
if (it->second->GetAncestor(pindex->nHeight) == pindex &&
pindexBestHeader->GetAncestor(pindex->nHeight) == pindex &&
pindexBestHeader->nChainWork >= nMinimumChainWork) {
// This block is a member of the assumed verified chain and an
// ancestor of the best header. The equivalent time check
// discourages hashpower from extorting the network via DOS
// attack into accepting an invalid block through telling users
// they must manually set assumevalid. Requiring a software
// change or burying the invalid block, regardless of the
// setting, makes it hard to hide the implication of the demand.
// This also avoids having release candidates that are hardly
// doing any signature verification at all in testing without
// having to artificially set the default assumed verified block
// further back. The test against nMinimumChainWork prevents the
// skipping when denied access to any chain at least as good as
// the expected chain.
fScriptChecks =
(GetBlockProofEquivalentTime(
*pindexBestHeader, *pindex, *pindexBestHeader,
consensusParams) <= 60 * 60 * 24 * 7 * 2);
}
}
}
int64_t nTime1 = GetTimeMicros();
nTimeCheck += nTime1 - nTimeStart;
LogPrint(BCLog::BENCH, " - Sanity checks: %.2fms [%.2fs]\n",
0.001 * (nTime1 - nTimeStart), nTimeCheck * 0.000001);
// Do not allow blocks that contain transactions which 'overwrite' older
// transactions, unless those are already completely spent. If such
// overwrites are allowed, coinbases and transactions depending upon those
// can be duplicated to remove the ability to spend the first instance --
// even after being sent to another address. See BIP30 and
// http://r6.ca/blog/20120206T005236Z.html for more information. This logic
// is not necessary for memory pool transactions, as AcceptToMemoryPool
// already refuses previously-known transaction ids entirely. This rule was
// originally applied to all blocks with a timestamp after March 15, 2012,
// 0:00 UTC. Now that the whole chain is irreversibly beyond that time it is
// applied to all blocks except the two in the chain that violate it. This
// prevents exploiting the issue against nodes during their initial block
// download.
bool fEnforceBIP30 = (!pindex->phashBlock) || // Enforce on CreateNewBlock
// invocations which don't
// have a hash.
!((pindex->nHeight == 91842 &&
pindex->GetBlockHash() ==
uint256S("0x00000000000a4d0a398161ffc163c503763"
"b1f4360639393e0e4c8e300e0caec")) ||
(pindex->nHeight == 91880 &&
pindex->GetBlockHash() ==
uint256S("0x00000000000743f190a18c5577a3c2d2a1f"
"610ae9601ac046a38084ccb7cd721")));
// Once BIP34 activated it was not possible to create new duplicate
// coinbases and thus other than starting with the 2 existing duplicate
// coinbase pairs, not possible to create overwriting txs. But by the time
// BIP34 activated, in each of the existing pairs the duplicate coinbase had
// overwritten the first before the first had been spent. Since those
// coinbases are sufficiently buried its no longer possible to create
// further duplicate transactions descending from the known pairs either. If
// we're on the known chain at height greater than where BIP34 activated, we
// can save the db accesses needed for the BIP30 check.
CBlockIndex *pindexBIP34height =
pindex->pprev->GetAncestor(consensusParams.BIP34Height);
// Only continue to enforce if we're below BIP34 activation height or the
// block hash at that height doesn't correspond.
fEnforceBIP30 =
fEnforceBIP30 &&
(!pindexBIP34height ||
!(pindexBIP34height->GetBlockHash() == consensusParams.BIP34Hash));
if (fEnforceBIP30) {
for (const auto &tx : block.vtx) {
for (size_t o = 0; o < tx->vout.size(); o++) {
if (view.HaveCoin(COutPoint(tx->GetId(), o))) {
return state.DoS(
100,
error("ConnectBlock(): tried to overwrite transaction"),
REJECT_INVALID, "bad-txns-BIP30");
}
}
}
}
// Start enforcing BIP68 (sequence locks) using versionbits logic.
int nLockTimeFlags = 0;
if (VersionBitsState(pindex->pprev, consensusParams,
Consensus::DEPLOYMENT_CSV,
versionbitscache) == THRESHOLD_ACTIVE) {
nLockTimeFlags |= LOCKTIME_VERIFY_SEQUENCE;
}
uint32_t flags = GetBlockScriptFlags(pindex, config);
int64_t nTime2 = GetTimeMicros();
nTimeForks += nTime2 - nTime1;
LogPrint(BCLog::BENCH, " - Fork checks: %.2fms [%.2fs]\n",
0.001 * (nTime2 - nTime1), nTimeForks * 0.000001);
CBlockUndo blockundo;
CCheckQueueControl control(fScriptChecks ? &scriptcheckqueue
: nullptr);
std::vector prevheights;
Amount nFees(0);
int nInputs = 0;
// Sigops counting. We need to do it again because of P2SH.
uint64_t nSigOpsCount = 0;
const uint64_t currentBlockSize =
::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
const uint64_t nMaxSigOpsCount = GetMaxBlockSigOpsCount(currentBlockSize);
CDiskTxPos pos(pindex->GetBlockPos(),
GetSizeOfCompactSize(block.vtx.size()));
std::vector> vPos;
vPos.reserve(block.vtx.size());
blockundo.vtxundo.reserve(block.vtx.size() - 1);
for (size_t i = 0; i < block.vtx.size(); i++) {
const CTransaction &tx = *(block.vtx[i]);
nInputs += tx.vin.size();
if (!tx.IsCoinBase()) {
if (!view.HaveInputs(tx)) {
return state.DoS(
100, error("ConnectBlock(): inputs missing/spent"),
REJECT_INVALID, "bad-txns-inputs-missingorspent");
}
// Check that transaction is BIP68 final BIP68 lock checks (as
// opposed to nLockTime checks) must be in ConnectBlock because they
// require the UTXO set.
prevheights.resize(tx.vin.size());
for (size_t j = 0; j < tx.vin.size(); j++) {
prevheights[j] = view.AccessCoin(tx.vin[j].prevout).GetHeight();
}
if (!SequenceLocks(tx, nLockTimeFlags, &prevheights, *pindex)) {
return state.DoS(
100, error("%s: contains a non-BIP68-final transaction",
__func__),
REJECT_INVALID, "bad-txns-nonfinal");
}
}
// GetTransactionSigOpCount counts 2 types of sigops:
// * legacy (always)
// * p2sh (when P2SH enabled in flags and excludes coinbase)
auto txSigOpsCount = GetTransactionSigOpCount(tx, view, flags);
if (txSigOpsCount > MAX_TX_SIGOPS_COUNT) {
return state.DoS(100, false, REJECT_INVALID, "bad-txn-sigops");
}
nSigOpsCount += txSigOpsCount;
if (nSigOpsCount > nMaxSigOpsCount) {
return state.DoS(100, error("ConnectBlock(): too many sigops"),
REJECT_INVALID, "bad-blk-sigops");
}
if (!tx.IsCoinBase()) {
Amount fee = view.GetValueIn(tx) - tx.GetValueOut();
nFees += fee;
// Don't cache results if we're actually connecting blocks (still
// consult the cache, though).
bool fCacheResults = fJustCheck;
std::vector vChecks;
if (!CheckInputs(tx, state, view, fScriptChecks, flags,
fCacheResults, fCacheResults,
PrecomputedTransactionData(tx), &vChecks)) {
return error("ConnectBlock(): CheckInputs on %s failed with %s",
tx.GetId().ToString(), FormatStateMessage(state));
}
control.Add(vChecks);
}
CTxUndo undoDummy;
if (i > 0) {
blockundo.vtxundo.push_back(CTxUndo());
}
UpdateCoins(tx, view, i == 0 ? undoDummy : blockundo.vtxundo.back(),
pindex->nHeight);
vPos.push_back(std::make_pair(tx.GetId(), pos));
pos.nTxOffset += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
}
int64_t nTime3 = GetTimeMicros();
nTimeConnect += nTime3 - nTime2;
LogPrint(BCLog::BENCH,
" - Connect %u transactions: %.2fms (%.3fms/tx, "
"%.3fms/txin) [%.2fs]\n",
(unsigned)block.vtx.size(), 0.001 * (nTime3 - nTime2),
0.001 * (nTime3 - nTime2) / block.vtx.size(),
nInputs <= 1 ? 0 : 0.001 * (nTime3 - nTime2) / (nInputs - 1),
nTimeConnect * 0.000001);
Amount blockReward =
nFees + GetBlockSubsidy(pindex->nHeight, consensusParams);
if (block.vtx[0]->GetValueOut() > blockReward) {
return state.DoS(100, error("ConnectBlock(): coinbase pays too much "
"(actual=%d vs limit=%d)",
block.vtx[0]->GetValueOut(), blockReward),
REJECT_INVALID, "bad-cb-amount");
}
if (!control.Wait()) {
return state.DoS(100, false, REJECT_INVALID, "blk-bad-inputs", false,
"parallel script check failed");
}
int64_t nTime4 = GetTimeMicros();
nTimeVerify += nTime4 - nTime2;
LogPrint(BCLog::BENCH,
" - Verify %u txins: %.2fms (%.3fms/txin) [%.2fs]\n",
nInputs - 1, 0.001 * (nTime4 - nTime2),
nInputs <= 1 ? 0 : 0.001 * (nTime4 - nTime2) / (nInputs - 1),
nTimeVerify * 0.000001);
if (fJustCheck) {
return true;
}
// Write undo information to disk
if (pindex->GetUndoPos().IsNull() ||
!pindex->IsValid(BLOCK_VALID_SCRIPTS)) {
if (pindex->GetUndoPos().IsNull()) {
CDiskBlockPos _pos;
if (!FindUndoPos(
state, pindex->nFile, _pos,
::GetSerializeSize(blockundo, SER_DISK, CLIENT_VERSION) +
40)) {
return error("ConnectBlock(): FindUndoPos failed");
}
if (!UndoWriteToDisk(blockundo, _pos, pindex->pprev->GetBlockHash(),
config.GetChainParams().DiskMagic())) {
return AbortNode(state, "Failed to write undo data");
}
// update nUndoPos in block index
pindex->nUndoPos = _pos.nPos;
pindex->nStatus |= BLOCK_HAVE_UNDO;
}
pindex->RaiseValidity(BLOCK_VALID_SCRIPTS);
setDirtyBlockIndex.insert(pindex);
}
if (fTxIndex && !pblocktree->WriteTxIndex(vPos)) {
return AbortNode(state, "Failed to write transaction index");
}
// add this block to the view's block chain
view.SetBestBlock(pindex->GetBlockHash());
int64_t nTime5 = GetTimeMicros();
nTimeIndex += nTime5 - nTime4;
LogPrint(BCLog::BENCH, " - Index writing: %.2fms [%.2fs]\n",
0.001 * (nTime5 - nTime4), nTimeIndex * 0.000001);
int64_t nTime6 = GetTimeMicros();
nTimeCallbacks += nTime6 - nTime5;
LogPrint(BCLog::BENCH, " - Callbacks: %.2fms [%.2fs]\n",
0.001 * (nTime6 - nTime5), nTimeCallbacks * 0.000001);
return true;
}
/**
* Update the on-disk chain state.
* The caches and indexes are flushed depending on the mode we're called with if
* they're too large, if it's been a while since the last write, or always and
* in all cases if we're in prune mode and are deleting files.
*/
static bool FlushStateToDisk(const CChainParams &chainparams,
CValidationState &state, FlushStateMode mode,
int nManualPruneHeight) {
int64_t nMempoolUsage = mempool.DynamicMemoryUsage();
LOCK(cs_main);
static int64_t nLastWrite = 0;
static int64_t nLastFlush = 0;
static int64_t nLastSetChain = 0;
std::set setFilesToPrune;
bool fFlushForPrune = false;
bool fDoFullFlush = false;
int64_t nNow = 0;
try {
{
LOCK(cs_LastBlockFile);
if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) &&
!fReindex) {
if (nManualPruneHeight > 0) {
FindFilesToPruneManual(setFilesToPrune, nManualPruneHeight);
} else {
FindFilesToPrune(setFilesToPrune,
chainparams.PruneAfterHeight());
fCheckForPruning = false;
}
if (!setFilesToPrune.empty()) {
fFlushForPrune = true;
if (!fHavePruned) {
pblocktree->WriteFlag("prunedblockfiles", true);
fHavePruned = true;
}
}
}
nNow = GetTimeMicros();
// Avoid writing/flushing immediately after startup.
if (nLastWrite == 0) {
nLastWrite = nNow;
}
if (nLastFlush == 0) {
nLastFlush = nNow;
}
if (nLastSetChain == 0) {
nLastSetChain = nNow;
}
int64_t nMempoolSizeMax =
gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
int64_t cacheSize = pcoinsTip->DynamicMemoryUsage();
int64_t nTotalSpace =
nCoinCacheUsage +
std::max(nMempoolSizeMax - nMempoolUsage, 0);
// The cache is large and we're within 10% and 10 MiB of the limit,
// but we have time now (not in the middle of a block processing).
bool fCacheLarge =
mode == FLUSH_STATE_PERIODIC &&
cacheSize > std::max((9 * nTotalSpace) / 10,
nTotalSpace -
MAX_BLOCK_COINSDB_USAGE * 1024 * 1024);
// The cache is over the limit, we have to write now.
bool fCacheCritical =
mode == FLUSH_STATE_IF_NEEDED && cacheSize > nTotalSpace;
// It's been a while since we wrote the block index to disk. Do this
// frequently, so we don't need to redownload after a crash.
bool fPeriodicWrite =
mode == FLUSH_STATE_PERIODIC &&
nNow > nLastWrite + (int64_t)DATABASE_WRITE_INTERVAL * 1000000;
// It's been very long since we flushed the cache. Do this
// infrequently, to optimize cache usage.
bool fPeriodicFlush =
mode == FLUSH_STATE_PERIODIC &&
nNow > nLastFlush + (int64_t)DATABASE_FLUSH_INTERVAL * 1000000;
// Combine all conditions that result in a full cache flush.
fDoFullFlush = (mode == FLUSH_STATE_ALWAYS) || fCacheLarge ||
fCacheCritical || fPeriodicFlush || fFlushForPrune;
// Write blocks and block index to disk.
if (fDoFullFlush || fPeriodicWrite) {
// Depend on nMinDiskSpace to ensure we can write block index
if (!CheckDiskSpace(0)) {
return state.Error("out of disk space");
}
// First make sure all block and undo data is flushed to disk.
FlushBlockFile();
// Then update all block file information (which may refer to
// block and undo files).
{
std::vector> vFiles;
vFiles.reserve(setDirtyFileInfo.size());
for (std::set::iterator it = setDirtyFileInfo.begin();
it != setDirtyFileInfo.end();) {
vFiles.push_back(
std::make_pair(*it, &vinfoBlockFile[*it]));
setDirtyFileInfo.erase(it++);
}
std::vector vBlocks;
vBlocks.reserve(setDirtyBlockIndex.size());
for (std::set::iterator it =
setDirtyBlockIndex.begin();
it != setDirtyBlockIndex.end();) {
vBlocks.push_back(*it);
setDirtyBlockIndex.erase(it++);
}
if (!pblocktree->WriteBatchSync(vFiles, nLastBlockFile,
vBlocks)) {
return AbortNode(
state, "Failed to write to block index database");
}
}
// Finally remove any pruned files
if (fFlushForPrune) UnlinkPrunedFiles(setFilesToPrune);
nLastWrite = nNow;
}
// Flush best chain related state. This can only be done if the
// blocks / block index write was also done.
if (fDoFullFlush) {
// Typical Coin structures on disk are around 48 bytes in size.
// Pushing a new one to the database can cause it to be written
// twice (once in the log, and once in the tables). This is
// already an overestimation, as most will delete an existing
// entry or overwrite one. Still, use a conservative safety
// factor of 2.
if (!CheckDiskSpace(48 * 2 * 2 * pcoinsTip->GetCacheSize())) {
return state.Error("out of disk space");
}
// Flush the chainstate (which may refer to block index
// entries).
if (!pcoinsTip->Flush()) {
return AbortNode(state, "Failed to write to coin database");
}
nLastFlush = nNow;
}
}
if (fDoFullFlush ||
((mode == FLUSH_STATE_ALWAYS || mode == FLUSH_STATE_PERIODIC) &&
nNow >
nLastSetChain + (int64_t)DATABASE_WRITE_INTERVAL * 1000000)) {
// Update best block in wallet (so we can detect restored wallets).
GetMainSignals().SetBestChain(chainActive.GetLocator());
nLastSetChain = nNow;
}
} catch (const std::runtime_error &e) {
return AbortNode(
state, std::string("System error while flushing: ") + e.what());
}
return true;
}
void FlushStateToDisk() {
CValidationState state;
const CChainParams &chainparams = Params();
FlushStateToDisk(chainparams, state, FLUSH_STATE_ALWAYS);
}
void PruneAndFlush() {
CValidationState state;
fCheckForPruning = true;
const CChainParams &chainparams = Params();
FlushStateToDisk(chainparams, state, FLUSH_STATE_NONE);
}
/** Update chainActive and related internal data structures. */
static void UpdateTip(const Config &config, CBlockIndex *pindexNew) {
const Consensus::Params &consensusParams =
config.GetChainParams().GetConsensus();
chainActive.SetTip(pindexNew);
// New best block
mempool.AddTransactionsUpdated(1);
cvBlockChange.notify_all();
static bool fWarned = false;
std::vector warningMessages;
if (!IsInitialBlockDownload()) {
int nUpgraded = 0;
const CBlockIndex *pindex = chainActive.Tip();
for (int bit = 0; bit < VERSIONBITS_NUM_BITS; bit++) {
WarningBitsConditionChecker checker(bit);
ThresholdState state =
checker.GetStateFor(pindex, consensusParams, warningcache[bit]);
if (state == THRESHOLD_ACTIVE || state == THRESHOLD_LOCKED_IN) {
if (state == THRESHOLD_ACTIVE) {
std::string strWarning =
strprintf(_("Warning: unknown new rules activated "
"(versionbit %i)"),
bit);
SetMiscWarning(strWarning);
if (!fWarned) {
AlertNotify(strWarning);
fWarned = true;
}
} else {
warningMessages.push_back(
strprintf("unknown new rules are about to activate "
"(versionbit %i)",
bit));
}
}
}
// Check the version of the last 100 blocks to see if we need to
// upgrade:
for (int i = 0; i < 100 && pindex != nullptr; i++) {
int32_t nExpectedVersion =
ComputeBlockVersion(pindex->pprev, consensusParams);
if (pindex->nVersion > VERSIONBITS_LAST_OLD_BLOCK_VERSION &&
(pindex->nVersion & ~nExpectedVersion) != 0)
++nUpgraded;
pindex = pindex->pprev;
}
if (nUpgraded > 0)
warningMessages.push_back(strprintf(
"%d of last 100 blocks have unexpected version", nUpgraded));
if (nUpgraded > 100 / 2) {
std::string strWarning =
_("Warning: Unknown block versions being mined! It's possible "
"unknown rules are in effect");
// notify GetWarnings(), called by Qt and the JSON-RPC code to warn
// the user:
SetMiscWarning(strWarning);
if (!fWarned) {
AlertNotify(strWarning);
fWarned = true;
}
}
}
LogPrintf("%s: new best=%s height=%d version=0x%08x log2_work=%.8g tx=%lu "
"date='%s' progress=%f cache=%.1fMiB(%utxo)",
__func__, chainActive.Tip()->GetBlockHash().ToString(),
chainActive.Height(), chainActive.Tip()->nVersion,
log(chainActive.Tip()->nChainWork.getdouble()) / log(2.0),
(unsigned long)chainActive.Tip()->nChainTx,
DateTimeStrFormat("%Y-%m-%d %H:%M:%S",
chainActive.Tip()->GetBlockTime()),
GuessVerificationProgress(config.GetChainParams().TxData(),
chainActive.Tip()),
pcoinsTip->DynamicMemoryUsage() * (1.0 / (1 << 20)),
pcoinsTip->GetCacheSize());
if (!warningMessages.empty())
LogPrintf(" warning='%s'",
boost::algorithm::join(warningMessages, ", "));
LogPrintf("\n");
}
/**
* Disconnect chainActive's tip.
* After calling, the mempool will be in an inconsistent state, with
* transactions from disconnected blocks being added to disconnectpool. You
* should make the mempool consistent again by calling UpdateMempoolForReorg.
* with cs_main held.
*
* If disconnectpool is nullptr, then no disconnected transactions are added to
* disconnectpool (note that the caller is responsible for mempool consistency
* in any case).
*/
static bool DisconnectTip(const Config &config, CValidationState &state,
DisconnectedBlockTransactions *disconnectpool) {
CBlockIndex *pindexDelete = chainActive.Tip();
assert(pindexDelete);
// Read block from disk.
std::shared_ptr pblock = std::make_shared();
CBlock &block = *pblock;
if (!ReadBlockFromDisk(block, pindexDelete, config)) {
return AbortNode(state, "Failed to read block");
}
// Apply the block atomically to the chain state.
int64_t nStart = GetTimeMicros();
{
CCoinsViewCache view(pcoinsTip);
assert(view.GetBestBlock() == pindexDelete->GetBlockHash());
if (DisconnectBlock(block, pindexDelete, view) != DISCONNECT_OK) {
return error("DisconnectTip(): DisconnectBlock %s failed",
pindexDelete->GetBlockHash().ToString());
}
bool flushed = view.Flush();
assert(flushed);
}
LogPrint(BCLog::BENCH, "- Disconnect block: %.2fms\n",
(GetTimeMicros() - nStart) * 0.001);
// Write the chain state to disk, if necessary.
if (!FlushStateToDisk(config.GetChainParams(), state,
FLUSH_STATE_IF_NEEDED)) {
return false;
}
if (disconnectpool) {
// Save transactions to re-add to mempool at end of reorg
for (const auto &tx : boost::adaptors::reverse(block.vtx)) {
disconnectpool->addTransaction(tx);
}
while (disconnectpool->DynamicMemoryUsage() >
MAX_DISCONNECTED_TX_POOL_SIZE) {
// Drop the earliest entry, and remove its children from the
// mempool.
auto it = disconnectpool->queuedTx.get().begin();
mempool.removeRecursive(**it, MemPoolRemovalReason::REORG);
disconnectpool->removeEntry(it);
}
}
// Update chainActive and related variables.
UpdateTip(config, pindexDelete->pprev);
// Let wallets know transactions went from 1-confirmed to
// 0-confirmed or conflicted:
GetMainSignals().BlockDisconnected(pblock);
return true;
}
static int64_t nTimeReadFromDisk = 0;
static int64_t nTimeConnectTotal = 0;
static int64_t nTimeFlush = 0;
static int64_t nTimeChainState = 0;
static int64_t nTimePostConnect = 0;
struct PerBlockConnectTrace {
CBlockIndex *pindex = nullptr;
std::shared_ptr pblock;
std::shared_ptr> conflictedTxs;
PerBlockConnectTrace()
: conflictedTxs(std::make_shared>()) {}
};
/**
* Used to track blocks whose transactions were applied to the UTXO state as a
* part of a single ActivateBestChainStep call.
*
* This class also tracks transactions that are removed from the mempool as
* conflicts (per block) and can be used to pass all those transactions through
* SyncTransaction.
*
* This class assumes (and asserts) that the conflicted transactions for a given
* block are added via mempool callbacks prior to the BlockConnected()
* associated with those transactions. If any transactions are marked
* conflicted, it is assumed that an associated block will always be added.
*
* This class is single-use, once you call GetBlocksConnected() you have to
* throw it away and make a new one.
*/
class ConnectTrace {
private:
std::vector blocksConnected;
CTxMemPool &pool;
public:
ConnectTrace(CTxMemPool &_pool) : blocksConnected(1), pool(_pool) {
pool.NotifyEntryRemoved.connect(
boost::bind(&ConnectTrace::NotifyEntryRemoved, this, _1, _2));
}
~ConnectTrace() {
pool.NotifyEntryRemoved.disconnect(
boost::bind(&ConnectTrace::NotifyEntryRemoved, this, _1, _2));
}
void BlockConnected(CBlockIndex *pindex,
std::shared_ptr pblock) {
assert(!blocksConnected.back().pindex);
assert(pindex);
assert(pblock);
blocksConnected.back().pindex = pindex;
blocksConnected.back().pblock = std::move(pblock);
blocksConnected.emplace_back();
}
std::vector &GetBlocksConnected() {
// We always keep one extra block at the end of our list because blocks
// are added after all the conflicted transactions have been filled in.
// Thus, the last entry should always be an empty one waiting for the
// transactions from the next block. We pop the last entry here to make
// sure the list we return is sane.
assert(!blocksConnected.back().pindex);
assert(blocksConnected.back().conflictedTxs->empty());
blocksConnected.pop_back();
return blocksConnected;
}
void NotifyEntryRemoved(CTransactionRef txRemoved,
MemPoolRemovalReason reason) {
assert(!blocksConnected.back().pindex);
if (reason == MemPoolRemovalReason::CONFLICT) {
blocksConnected.back().conflictedTxs->emplace_back(
std::move(txRemoved));
}
}
};
/**
* Connect a new block to chainActive. pblock is either nullptr or a pointer to
* a CBlock corresponding to pindexNew, to bypass loading it again from disk.
*
* The block is always added to connectTrace (either after loading from disk or
* by copying pblock) - if that is not intended, care must be taken to remove
* the last entry in blocksConnected in case of failure.
*/
static bool ConnectTip(const Config &config, CValidationState &state,
CBlockIndex *pindexNew,
const std::shared_ptr &pblock,
ConnectTrace &connectTrace,
DisconnectedBlockTransactions &disconnectpool) {
assert(pindexNew->pprev == chainActive.Tip());
// Read block from disk.
int64_t nTime1 = GetTimeMicros();
std::shared_ptr pthisBlock;
if (!pblock) {
std::shared_ptr pblockNew = std::make_shared();
if (!ReadBlockFromDisk(*pblockNew, pindexNew, config)) {
return AbortNode(state, "Failed to read block");
}
pthisBlock = pblockNew;
} else {
pthisBlock = pblock;
}
const CBlock &blockConnecting = *pthisBlock;
// Apply the block atomically to the chain state.
int64_t nTime2 = GetTimeMicros();
nTimeReadFromDisk += nTime2 - nTime1;
int64_t nTime3;
LogPrint(BCLog::BENCH, " - Load block from disk: %.2fms [%.2fs]\n",
(nTime2 - nTime1) * 0.001, nTimeReadFromDisk * 0.000001);
{
CCoinsViewCache view(pcoinsTip);
bool rv = ConnectBlock(config, blockConnecting, state, pindexNew, view);
GetMainSignals().BlockChecked(blockConnecting, state);
if (!rv) {
if (state.IsInvalid()) {
InvalidBlockFound(pindexNew, state);
}
return error("ConnectTip(): ConnectBlock %s failed",
pindexNew->GetBlockHash().ToString());
}
nTime3 = GetTimeMicros();
nTimeConnectTotal += nTime3 - nTime2;
LogPrint(BCLog::BENCH, " - Connect total: %.2fms [%.2fs]\n",
(nTime3 - nTime2) * 0.001, nTimeConnectTotal * 0.000001);
bool flushed = view.Flush();
assert(flushed);
}
int64_t nTime4 = GetTimeMicros();
nTimeFlush += nTime4 - nTime3;
LogPrint(BCLog::BENCH, " - Flush: %.2fms [%.2fs]\n",
(nTime4 - nTime3) * 0.001, nTimeFlush * 0.000001);
// Write the chain state to disk, if necessary.
if (!FlushStateToDisk(config.GetChainParams(), state,
FLUSH_STATE_IF_NEEDED)) {
return false;
}
int64_t nTime5 = GetTimeMicros();
nTimeChainState += nTime5 - nTime4;
LogPrint(BCLog::BENCH, " - Writing chainstate: %.2fms [%.2fs]\n",
(nTime5 - nTime4) * 0.001, nTimeChainState * 0.000001);
// Remove conflicting transactions from the mempool.;
mempool.removeForBlock(blockConnecting.vtx, pindexNew->nHeight);
disconnectpool.removeForBlock(blockConnecting.vtx);
// Update chainActive & related variables.
UpdateTip(config, pindexNew);
int64_t nTime6 = GetTimeMicros();
nTimePostConnect += nTime6 - nTime5;
nTimeTotal += nTime6 - nTime1;
LogPrint(BCLog::BENCH, " - Connect postprocess: %.2fms [%.2fs]\n",
(nTime6 - nTime5) * 0.001, nTimePostConnect * 0.000001);
LogPrint(BCLog::BENCH, "- Connect block: %.2fms [%.2fs]\n",
(nTime6 - nTime1) * 0.001, nTimeTotal * 0.000001);
connectTrace.BlockConnected(pindexNew, std::move(pthisBlock));
return true;
}
/**
* Return the tip of the chain with the most work in it, that isn't known to be
* invalid (it's however far from certain to be valid).
*/
static CBlockIndex *FindMostWorkChain() {
do {
CBlockIndex *pindexNew = nullptr;
// Find the best candidate header.
{
std::set::reverse_iterator
it = setBlockIndexCandidates.rbegin();
if (it == setBlockIndexCandidates.rend()) return nullptr;
pindexNew = *it;
}
// Check whether all blocks on the path between the currently active
// chain and the candidate are valid. Just going until the active chain
// is an optimization, as we know all blocks in it are valid already.
CBlockIndex *pindexTest = pindexNew;
bool fInvalidAncestor = false;
while (pindexTest && !chainActive.Contains(pindexTest)) {
assert(pindexTest->nChainTx || pindexTest->nHeight == 0);
// Pruned nodes may have entries in setBlockIndexCandidates for
// which block files have been deleted. Remove those as candidates
// for the most work chain if we come across them; we can't switch
// to a chain unless we have all the non-active-chain parent blocks.
bool fFailedChain = pindexTest->nStatus & BLOCK_FAILED_MASK;
bool fMissingData = !(pindexTest->nStatus & BLOCK_HAVE_DATA);
if (fFailedChain || fMissingData) {
// Candidate chain is not usable (either invalid or missing
// data)
if (fFailedChain &&
(pindexBestInvalid == nullptr ||
pindexNew->nChainWork > pindexBestInvalid->nChainWork))
pindexBestInvalid = pindexNew;
CBlockIndex *pindexFailed = pindexNew;
// Remove the entire chain from the set.
while (pindexTest != pindexFailed) {
if (fFailedChain) {
pindexFailed->nStatus |= BLOCK_FAILED_CHILD;
} else if (fMissingData) {
// If we're missing data, then add back to
// mapBlocksUnlinked, so that if the block arrives in
// the future we can try adding to
// setBlockIndexCandidates again.
mapBlocksUnlinked.insert(
std::make_pair(pindexFailed->pprev, pindexFailed));
}
setBlockIndexCandidates.erase(pindexFailed);
pindexFailed = pindexFailed->pprev;
}
setBlockIndexCandidates.erase(pindexTest);
fInvalidAncestor = true;
break;
}
pindexTest = pindexTest->pprev;
}
if (!fInvalidAncestor) return pindexNew;
} while (true);
}
/** Delete all entries in setBlockIndexCandidates that are worse than the
* current tip. */
static void PruneBlockIndexCandidates() {
// Note that we can't delete the current block itself, as we may need to
// return to it later in case a reorganization to a better block fails.
std::set::iterator it =
setBlockIndexCandidates.begin();
while (it != setBlockIndexCandidates.end() &&
setBlockIndexCandidates.value_comp()(*it, chainActive.Tip())) {
setBlockIndexCandidates.erase(it++);
}
// Either the current tip or a successor of it we're working towards is left
// in setBlockIndexCandidates.
assert(!setBlockIndexCandidates.empty());
}
/**
* Try to make some progress towards making pindexMostWork the active block.
* pblock is either nullptr or a pointer to a CBlock corresponding to
* pindexMostWork.
*/
static bool ActivateBestChainStep(const Config &config, CValidationState &state,
CBlockIndex *pindexMostWork,
const std::shared_ptr &pblock,
bool &fInvalidFound,
ConnectTrace &connectTrace) {
AssertLockHeld(cs_main);
const CBlockIndex *pindexOldTip = chainActive.Tip();
const CBlockIndex *pindexFork = chainActive.FindFork(pindexMostWork);
// Disconnect active blocks which are no longer in the best chain.
bool fBlocksDisconnected = false;
DisconnectedBlockTransactions disconnectpool;
while (chainActive.Tip() && chainActive.Tip() != pindexFork) {
if (!DisconnectTip(config, state, &disconnectpool)) {
// This is likely a fatal error, but keep the mempool consistent,
// just in case. Only remove from the mempool in this case.
UpdateMempoolForReorg(config, disconnectpool, false);
return false;
}
fBlocksDisconnected = true;
}
// Build list of new blocks to connect.
std::vector vpindexToConnect;
bool fContinue = true;
int nHeight = pindexFork ? pindexFork->nHeight : -1;
while (fContinue && nHeight != pindexMostWork->nHeight) {
// Don't iterate the entire list of potential improvements toward the
// best tip, as we likely only need a few blocks along the way.
int nTargetHeight = std::min(nHeight + 32, pindexMostWork->nHeight);
vpindexToConnect.clear();
vpindexToConnect.reserve(nTargetHeight - nHeight);
CBlockIndex *pindexIter = pindexMostWork->GetAncestor(nTargetHeight);
while (pindexIter && pindexIter->nHeight != nHeight) {
vpindexToConnect.push_back(pindexIter);
pindexIter = pindexIter->pprev;
}
nHeight = nTargetHeight;
// Connect new blocks.
for (CBlockIndex *pindexConnect :
boost::adaptors::reverse(vpindexToConnect)) {
if (!ConnectTip(config, state, pindexConnect,
pindexConnect == pindexMostWork
? pblock
: std::shared_ptr(),
connectTrace, disconnectpool)) {
if (state.IsInvalid()) {
// The block violates a consensus rule.
if (!state.CorruptionPossible())
InvalidChainFound(vpindexToConnect.back());
state = CValidationState();
fInvalidFound = true;
fContinue = false;
break;
} else {
// A system error occurred (disk space, database error,
// ...).
// Make the mempool consistent with the current tip, just in
// case any observers try to use it before shutdown.
UpdateMempoolForReorg(config, disconnectpool, false);
return false;
}
} else {
PruneBlockIndexCandidates();
if (!pindexOldTip ||
chainActive.Tip()->nChainWork > pindexOldTip->nChainWork) {
// We're in a better position than we were. Return
// temporarily to release the lock.
fContinue = false;
break;
}
}
}
}
if (fBlocksDisconnected) {
// If any blocks were disconnected, disconnectpool may be non empty. Add
// any disconnected transactions back to the mempool.
UpdateMempoolForReorg(config, disconnectpool, true);
}
mempool.check(pcoinsTip);
// Callbacks/notifications for a new best chain.
if (fInvalidFound)
CheckForkWarningConditionsOnNewFork(vpindexToConnect.back());
else
CheckForkWarningConditions();
return true;
}
static void NotifyHeaderTip() {
bool fNotify = false;
bool fInitialBlockDownload = false;
static CBlockIndex *pindexHeaderOld = nullptr;
CBlockIndex *pindexHeader = nullptr;
{
LOCK(cs_main);
pindexHeader = pindexBestHeader;
if (pindexHeader != pindexHeaderOld) {
fNotify = true;
fInitialBlockDownload = IsInitialBlockDownload();
pindexHeaderOld = pindexHeader;
}
}
// Send block tip changed notifications without cs_main
if (fNotify) {
uiInterface.NotifyHeaderTip(fInitialBlockDownload, pindexHeader);
}
}
/**
* Make the best chain active, in multiple steps. The result is either failure
* or an activated best chain. pblock is either nullptr or a pointer to a block
* that is already loaded (to avoid loading it again from disk).
*/
bool ActivateBestChain(const Config &config, CValidationState &state,
std::shared_ptr pblock) {
// Note that while we're often called here from ProcessNewBlock, this is
// far from a guarantee. Things in the P2P/RPC will often end up calling
// us in the middle of ProcessNewBlock - do not assume pblock is set
// sanely for performance or correctness!
CBlockIndex *pindexMostWork = nullptr;
CBlockIndex *pindexNewTip = nullptr;
do {
boost::this_thread::interruption_point();
if (ShutdownRequested()) break;
const CBlockIndex *pindexFork;
bool fInitialDownload;
{
LOCK(cs_main);
// Destructed before cs_main is unlocked.
ConnectTrace connectTrace(mempool);
CBlockIndex *pindexOldTip = chainActive.Tip();
if (pindexMostWork == nullptr) {
pindexMostWork = FindMostWorkChain();
}
// Whether we have anything to do at all.
if (pindexMostWork == nullptr ||
pindexMostWork == chainActive.Tip()) {
return true;
}
bool fInvalidFound = false;
std::shared_ptr nullBlockPtr;
if (!ActivateBestChainStep(
config, state, pindexMostWork,
pblock &&
pblock->GetHash() == pindexMostWork->GetBlockHash()
? pblock
: nullBlockPtr,
fInvalidFound, connectTrace)) {
return false;
}
if (fInvalidFound) {
// Wipe cache, we may need another branch now.
pindexMostWork = nullptr;
}
pindexNewTip = chainActive.Tip();
pindexFork = chainActive.FindFork(pindexOldTip);
fInitialDownload = IsInitialBlockDownload();
for (const PerBlockConnectTrace &trace :
connectTrace.GetBlocksConnected()) {
assert(trace.pblock && trace.pindex);
GetMainSignals().BlockConnected(trace.pblock, trace.pindex,
*trace.conflictedTxs);
}
}
// When we reach this point, we switched to a new tip (stored in
// pindexNewTip).
// Notifications/callbacks that can run without cs_main
// Notify external listeners about the new tip.
GetMainSignals().UpdatedBlockTip(pindexNewTip, pindexFork,
fInitialDownload);
// Always notify the UI if a new block tip was connected
if (pindexFork != pindexNewTip) {
uiInterface.NotifyBlockTip(fInitialDownload, pindexNewTip);
}
} while (pindexNewTip != pindexMostWork);
const CChainParams ¶ms = config.GetChainParams();
CheckBlockIndex(params.GetConsensus());
// Write changes periodically to disk, after relay.
if (!FlushStateToDisk(params, state, FLUSH_STATE_PERIODIC)) {
return false;
}
int nStopAtHeight = gArgs.GetArg("-stopatheight", DEFAULT_STOPATHEIGHT);
if (nStopAtHeight && pindexNewTip &&
pindexNewTip->nHeight >= nStopAtHeight) {
StartShutdown();
}
return true;
}
bool PreciousBlock(const Config &config, CValidationState &state,
CBlockIndex *pindex) {
{
LOCK(cs_main);
if (pindex->nChainWork < chainActive.Tip()->nChainWork) {
// Nothing to do, this block is not at the tip.
return true;
}
if (chainActive.Tip()->nChainWork > nLastPreciousChainwork) {
// The chain has been extended since the last call, reset the
// counter.
nBlockReverseSequenceId = -1;
}
nLastPreciousChainwork = chainActive.Tip()->nChainWork;
setBlockIndexCandidates.erase(pindex);
pindex->nSequenceId = nBlockReverseSequenceId;
if (nBlockReverseSequenceId > std::numeric_limits::min()) {
// We can't keep reducing the counter if somebody really wants to
// call preciousblock 2**31-1 times on the same set of tips...
nBlockReverseSequenceId--;
}
if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS) && pindex->nChainTx) {
setBlockIndexCandidates.insert(pindex);
PruneBlockIndexCandidates();
}
}
return ActivateBestChain(config, state);
}
bool InvalidateBlock(const Config &config, CValidationState &state,
CBlockIndex *pindex) {
AssertLockHeld(cs_main);
// Mark the block itself as invalid.
pindex->nStatus |= BLOCK_FAILED_VALID;
setDirtyBlockIndex.insert(pindex);
setBlockIndexCandidates.erase(pindex);
DisconnectedBlockTransactions disconnectpool;
while (chainActive.Contains(pindex)) {
CBlockIndex *pindexWalk = chainActive.Tip();
pindexWalk->nStatus |= BLOCK_FAILED_CHILD;
setDirtyBlockIndex.insert(pindexWalk);
setBlockIndexCandidates.erase(pindexWalk);
// ActivateBestChain considers blocks already in chainActive
// unconditionally valid already, so force disconnect away from it.
if (!DisconnectTip(config, state, &disconnectpool)) {
// It's probably hopeless to try to make the mempool consistent
// here if DisconnectTip failed, but we can try.
UpdateMempoolForReorg(config, disconnectpool, false);
return false;
}
}
// DisconnectTip will add transactions to disconnectpool; try to add these
// back to the mempool.
UpdateMempoolForReorg(config, disconnectpool, true);
// The resulting new best tip may not be in setBlockIndexCandidates anymore,
// so add it again.
BlockMap::iterator it = mapBlockIndex.begin();
while (it != mapBlockIndex.end()) {
if (it->second->IsValid(BLOCK_VALID_TRANSACTIONS) &&
it->second->nChainTx &&
!setBlockIndexCandidates.value_comp()(it->second,
chainActive.Tip())) {
setBlockIndexCandidates.insert(it->second);
}
it++;
}
InvalidChainFound(pindex);
uiInterface.NotifyBlockTip(IsInitialBlockDownload(), pindex->pprev);
return true;
}
bool ResetBlockFailureFlags(CBlockIndex *pindex) {
AssertLockHeld(cs_main);
int nHeight = pindex->nHeight;
// Remove the invalidity flag from this block and all its descendants.
BlockMap::iterator it = mapBlockIndex.begin();
while (it != mapBlockIndex.end()) {
if (!it->second->IsValid() &&
it->second->GetAncestor(nHeight) == pindex) {
it->second->nStatus &= ~BLOCK_FAILED_MASK;
setDirtyBlockIndex.insert(it->second);
if (it->second->IsValid(BLOCK_VALID_TRANSACTIONS) &&
it->second->nChainTx &&
setBlockIndexCandidates.value_comp()(chainActive.Tip(),
it->second)) {
setBlockIndexCandidates.insert(it->second);
}
if (it->second == pindexBestInvalid) {
// Reset invalid block marker if it was pointing to one of
// those.
pindexBestInvalid = nullptr;
}
}
it++;
}
// Remove the invalidity flag from all ancestors too.
while (pindex != nullptr) {
if (pindex->nStatus & BLOCK_FAILED_MASK) {
pindex->nStatus &= ~BLOCK_FAILED_MASK;
setDirtyBlockIndex.insert(pindex);
}
pindex = pindex->pprev;
}
return true;
}
static CBlockIndex *AddToBlockIndex(const CBlockHeader &block) {
// Check for duplicate
uint256 hash = block.GetHash();
BlockMap::iterator it = mapBlockIndex.find(hash);
if (it != mapBlockIndex.end()) return it->second;
// Construct new block index object
CBlockIndex *pindexNew = new CBlockIndex(block);
assert(pindexNew);
// We assign the sequence id to blocks only when the full data is available,
// to avoid miners withholding blocks but broadcasting headers, to get a
// competitive advantage.
pindexNew->nSequenceId = 0;
BlockMap::iterator mi =
mapBlockIndex.insert(std::make_pair(hash, pindexNew)).first;
pindexNew->phashBlock = &((*mi).first);
BlockMap::iterator miPrev = mapBlockIndex.find(block.hashPrevBlock);
if (miPrev != mapBlockIndex.end()) {
pindexNew->pprev = (*miPrev).second;
pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
pindexNew->BuildSkip();
}
pindexNew->nTimeMax =
(pindexNew->pprev
? std::max(pindexNew->pprev->nTimeMax, pindexNew->nTime)
: pindexNew->nTime);
pindexNew->nChainWork =
(pindexNew->pprev ? pindexNew->pprev->nChainWork : 0) +
GetBlockProof(*pindexNew);
pindexNew->RaiseValidity(BLOCK_VALID_TREE);
if (pindexBestHeader == nullptr ||
pindexBestHeader->nChainWork < pindexNew->nChainWork) {
pindexBestHeader = pindexNew;
}
setDirtyBlockIndex.insert(pindexNew);
return pindexNew;
}
/**
* Mark a block as having its data received and checked (up to
* BLOCK_VALID_TRANSACTIONS).
*/
bool ReceivedBlockTransactions(const CBlock &block, CValidationState &state,
CBlockIndex *pindexNew,
const CDiskBlockPos &pos) {
pindexNew->nTx = block.vtx.size();
pindexNew->nChainTx = 0;
pindexNew->nFile = pos.nFile;
pindexNew->nDataPos = pos.nPos;
pindexNew->nUndoPos = 0;
pindexNew->nStatus |= BLOCK_HAVE_DATA;
pindexNew->RaiseValidity(BLOCK_VALID_TRANSACTIONS);
setDirtyBlockIndex.insert(pindexNew);
if (pindexNew->pprev == nullptr || pindexNew->pprev->nChainTx) {
// If pindexNew is the genesis block or all parents are
// BLOCK_VALID_TRANSACTIONS.
std::deque queue;
queue.push_back(pindexNew);
// Recursively process any descendant blocks that now may be eligible to
// be connected.
while (!queue.empty()) {
CBlockIndex *pindex = queue.front();
queue.pop_front();
pindex->nChainTx =
(pindex->pprev ? pindex->pprev->nChainTx : 0) + pindex->nTx;
{
LOCK(cs_nBlockSequenceId);
pindex->nSequenceId = nBlockSequenceId++;
}
if (chainActive.Tip() == nullptr ||
!setBlockIndexCandidates.value_comp()(pindex,
chainActive.Tip())) {
setBlockIndexCandidates.insert(pindex);
}
std::pair::iterator,
std::multimap::iterator>
range = mapBlocksUnlinked.equal_range(pindex);
while (range.first != range.second) {
std::multimap::iterator it =
range.first;
queue.push_back(it->second);
range.first++;
mapBlocksUnlinked.erase(it);
}
}
} else {
if (pindexNew->pprev && pindexNew->pprev->IsValid(BLOCK_VALID_TREE)) {
mapBlocksUnlinked.insert(
std::make_pair(pindexNew->pprev, pindexNew));
}
}
return true;
}
static bool FindBlockPos(CValidationState &state, CDiskBlockPos &pos,
unsigned int nAddSize, unsigned int nHeight,
uint64_t nTime, bool fKnown = false) {
LOCK(cs_LastBlockFile);
unsigned int nFile = fKnown ? pos.nFile : nLastBlockFile;
if (vinfoBlockFile.size() <= nFile) {
vinfoBlockFile.resize(nFile + 1);
}
if (!fKnown) {
while (vinfoBlockFile[nFile].nSize + nAddSize >= MAX_BLOCKFILE_SIZE) {
nFile++;
if (vinfoBlockFile.size() <= nFile) {
vinfoBlockFile.resize(nFile + 1);
}
}
pos.nFile = nFile;
pos.nPos = vinfoBlockFile[nFile].nSize;
}
if ((int)nFile != nLastBlockFile) {
if (!fKnown) {
LogPrintf("Leaving block file %i: %s\n", nLastBlockFile,
vinfoBlockFile[nLastBlockFile].ToString());
}
FlushBlockFile(!fKnown);
nLastBlockFile = nFile;
}
vinfoBlockFile[nFile].AddBlock(nHeight, nTime);
if (fKnown)
vinfoBlockFile[nFile].nSize =
std::max(pos.nPos + nAddSize, vinfoBlockFile[nFile].nSize);
else
vinfoBlockFile[nFile].nSize += nAddSize;
if (!fKnown) {
unsigned int nOldChunks =
(pos.nPos + BLOCKFILE_CHUNK_SIZE - 1) / BLOCKFILE_CHUNK_SIZE;
unsigned int nNewChunks =
(vinfoBlockFile[nFile].nSize + BLOCKFILE_CHUNK_SIZE - 1) /
BLOCKFILE_CHUNK_SIZE;
if (nNewChunks > nOldChunks) {
if (fPruneMode) fCheckForPruning = true;
if (CheckDiskSpace(nNewChunks * BLOCKFILE_CHUNK_SIZE - pos.nPos)) {
FILE *file = OpenBlockFile(pos);
if (file) {
LogPrintf(
"Pre-allocating up to position 0x%x in blk%05u.dat\n",
nNewChunks * BLOCKFILE_CHUNK_SIZE, pos.nFile);
AllocateFileRange(file, pos.nPos,
nNewChunks * BLOCKFILE_CHUNK_SIZE -
pos.nPos);
fclose(file);
}
} else
return state.Error("out of disk space");
}
}
setDirtyFileInfo.insert(nFile);
return true;
}
static bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos,
unsigned int nAddSize) {
pos.nFile = nFile;
LOCK(cs_LastBlockFile);
unsigned int nNewSize;
pos.nPos = vinfoBlockFile[nFile].nUndoSize;
nNewSize = vinfoBlockFile[nFile].nUndoSize += nAddSize;
setDirtyFileInfo.insert(nFile);
unsigned int nOldChunks =
(pos.nPos + UNDOFILE_CHUNK_SIZE - 1) / UNDOFILE_CHUNK_SIZE;
unsigned int nNewChunks =
(nNewSize + UNDOFILE_CHUNK_SIZE - 1) / UNDOFILE_CHUNK_SIZE;
if (nNewChunks > nOldChunks) {
if (fPruneMode) fCheckForPruning = true;
if (CheckDiskSpace(nNewChunks * UNDOFILE_CHUNK_SIZE - pos.nPos)) {
FILE *file = OpenUndoFile(pos);
if (file) {
LogPrintf("Pre-allocating up to position 0x%x in rev%05u.dat\n",
nNewChunks * UNDOFILE_CHUNK_SIZE, pos.nFile);
AllocateFileRange(file, pos.nPos,
nNewChunks * UNDOFILE_CHUNK_SIZE - pos.nPos);
fclose(file);
}
} else
return state.Error("out of disk space");
}
return true;
}
static bool CheckBlockHeader(const Config &config, const CBlockHeader &block,
CValidationState &state, bool fCheckPOW = true) {
// Check proof of work matches claimed amount
if (fCheckPOW && !CheckProofOfWork(block.GetHash(), block.nBits, config)) {
return state.DoS(50, false, REJECT_INVALID, "high-hash", false,
"proof of work failed");
}
return true;
}
bool CheckBlock(const Config &config, const CBlock &block,
CValidationState &state, bool fCheckPOW,
bool fCheckMerkleRoot) {
// These are checks that are independent of context.
if (block.fChecked) {
return true;
}
// Check that the header is valid (particularly PoW). This is mostly
// redundant with the call in AcceptBlockHeader.
if (!CheckBlockHeader(config, block, state, fCheckPOW)) {
return false;
}
// Check the merkle root.
if (fCheckMerkleRoot) {
bool mutated;
uint256 hashMerkleRoot2 = BlockMerkleRoot(block, &mutated);
if (block.hashMerkleRoot != hashMerkleRoot2) {
return state.DoS(100, false, REJECT_INVALID, "bad-txnmrklroot",
true, "hashMerkleRoot mismatch");
}
// Check for merkle tree malleability (CVE-2012-2459): repeating
// sequences of transactions in a block without affecting the merkle
// root of a block, while still invalidating it.
if (mutated) {
return state.DoS(100, false, REJECT_INVALID, "bad-txns-duplicate",
true, "duplicate transaction");
}
}
// All potential-corruption validation must be done before we do any
// transaction validation, as otherwise we may mark the header as invalid
// because we receive the wrong transactions for it.
// First transaction must be coinbase.
if (block.vtx.empty()) {
return state.DoS(100, false, REJECT_INVALID, "bad-cb-missing", false,
"first tx is not coinbase");
}
// Size limits.
auto nMaxBlockSize = config.GetMaxBlockSize();
// Bail early if there is no way this block is of reasonable size.
if ((block.vtx.size() * MIN_TRANSACTION_SIZE) > nMaxBlockSize) {
return state.DoS(100, false, REJECT_INVALID, "bad-blk-length", false,
"size limits failed");
}
auto currentBlockSize =
::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
if (currentBlockSize > nMaxBlockSize) {
return state.DoS(100, false, REJECT_INVALID, "bad-blk-length", false,
"size limits failed");
}
// And a valid coinbase.
if (!CheckCoinbase(*block.vtx[0], state, false)) {
return state.Invalid(false, state.GetRejectCode(),
state.GetRejectReason(),
strprintf("Coinbase check failed (txid %s) %s",
block.vtx[0]->GetId().ToString(),
state.GetDebugMessage()));
}
// Keep track of the sigops count.
uint64_t nSigOps = 0;
auto nMaxSigOpsCount = GetMaxBlockSigOpsCount(currentBlockSize);
// Check transactions
auto txCount = block.vtx.size();
auto *tx = block.vtx[0].get();
size_t i = 0;
while (true) {
// Count the sigops for the current transaction. If the total sigops
// count is too high, the the block is invalid.
nSigOps += GetSigOpCountWithoutP2SH(*tx);
if (nSigOps > nMaxSigOpsCount) {
return state.DoS(100, false, REJECT_INVALID, "bad-blk-sigops",
false, "out-of-bounds SigOpCount");
}
// Go to the next transaction.
i++;
// We reached the end of the block, success.
if (i >= txCount) {
break;
}
// Check that the transaction is valid. because this check differs for
// the coinbase, the loos is arranged such as this only runs after at
// least one increment.
tx = block.vtx[i].get();
if (!CheckRegularTransaction(*tx, state, false)) {
return state.Invalid(
false, state.GetRejectCode(), state.GetRejectReason(),
strprintf("Transaction check failed (txid %s) %s",
tx->GetId().ToString(), state.GetDebugMessage()));
}
}
if (fCheckPOW && fCheckMerkleRoot) {
block.fChecked = true;
}
return true;
}
static bool CheckIndexAgainstCheckpoint(const CBlockIndex *pindexPrev,
CValidationState &state,
const CChainParams &chainparams,
const uint256 &hash) {
if (*pindexPrev->phashBlock ==
chainparams.GetConsensus().hashGenesisBlock) {
return true;
}
int nHeight = pindexPrev->nHeight + 1;
// Don't accept any forks from the main chain prior to last checkpoint.
// GetLastCheckpoint finds the last checkpoint in MapCheckpoints that's in
// our MapBlockIndex.
CBlockIndex *pcheckpoint =
Checkpoints::GetLastCheckpoint(chainparams.Checkpoints());
if (pcheckpoint && nHeight < pcheckpoint->nHeight) {
return state.DoS(
100,
error("%s: forked chain older than last checkpoint (height %d)",
__func__, nHeight),
REJECT_CHECKPOINT, "bad-fork-prior-to-checkpoint");
}
return true;
}
static bool ContextualCheckBlockHeader(const Config &config,
const CBlockHeader &block,
CValidationState &state,
const CBlockIndex *pindexPrev,
int64_t nAdjustedTime) {
const Consensus::Params &consensusParams =
config.GetChainParams().GetConsensus();
const int nHeight = pindexPrev == nullptr ? 0 : pindexPrev->nHeight + 1;
// Check proof of work
if (block.nBits != GetNextWorkRequired(pindexPrev, &block, config)) {
LogPrintf("bad bits after height: %d\n", pindexPrev->nHeight);
return state.DoS(100, false, REJECT_INVALID, "bad-diffbits", false,
"incorrect proof of work");
}
// Check timestamp against prev
if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast()) {
return state.Invalid(false, REJECT_INVALID, "time-too-old",
"block's timestamp is too early");
}
// Check timestamp
if (block.GetBlockTime() > nAdjustedTime + MAX_FUTURE_BLOCK_TIME) {
return state.Invalid(false, REJECT_INVALID, "time-too-new",
"block timestamp too far in the future");
}
// Reject outdated version blocks when 95% (75% on testnet) of the network
// has upgraded:
// check for version 2, 3 and 4 upgrades
if ((block.nVersion < 2 && nHeight >= consensusParams.BIP34Height) ||
(block.nVersion < 3 && nHeight >= consensusParams.BIP66Height) ||
(block.nVersion < 4 && nHeight >= consensusParams.BIP65Height)) {
return state.Invalid(
false, REJECT_OBSOLETE,
strprintf("bad-version(0x%08x)", block.nVersion),
strprintf("rejected nVersion=0x%08x block", block.nVersion));
}
return true;
}
bool ContextualCheckTransaction(const Config &config, const CTransaction &tx,
CValidationState &state, int nHeight,
int64_t nLockTimeCutoff) {
if (!IsFinalTx(tx, nHeight, nLockTimeCutoff)) {
// While this is only one transaction, we use txns in the error to
// ensure continuity with other clients.
return state.DoS(10, false, REJECT_INVALID, "bad-txns-nonfinal", false,
"non-final transaction");
}
const Consensus::Params &consensusParams =
config.GetChainParams().GetConsensus();
if (IsUAHFenabled(config, nHeight) &&
nHeight <= consensusParams.antiReplayOpReturnSunsetHeight) {
for (const CTxOut &o : tx.vout) {
if (o.scriptPubKey.IsCommitment(
consensusParams.antiReplayOpReturnCommitment)) {
return state.DoS(10, false, REJECT_INVALID, "bad-txn-replay",
false, "non playable transaction");
}
}
}
return true;
}
bool ContextualCheckTransactionForCurrentBlock(const Config &config,
const CTransaction &tx,
CValidationState &state,
int flags) {
AssertLockHeld(cs_main);
// By convention a negative value for flags indicates that the current
// network-enforced consensus rules should be used. In a future soft-fork
// scenario that would mean checking which rules would be enforced for the
// next block and setting the appropriate flags. At the present time no
// soft-forks are scheduled, so no flags are set.
flags = std::max(flags, 0);
// ContextualCheckTransactionForCurrentBlock() uses chainActive.Height()+1
// to evaluate nLockTime because when IsFinalTx() is called within
// CBlock::AcceptBlock(), the height of the block *being* evaluated is what
// is used. Thus if we want to know if a transaction can be part of the
// *next* block, we need to call ContextualCheckTransaction() with one more
// than chainActive.Height().
const int nBlockHeight = chainActive.Height() + 1;
// BIP113 will require that time-locked transactions have nLockTime set to
// less than the median time of the previous block they're contained in.
// When the next block is created its previous block will be the current
// chain tip, so we use that to calculate the median time passed to
// ContextualCheckTransaction() if LOCKTIME_MEDIAN_TIME_PAST is set.
const int64_t nLockTimeCutoff = (flags & LOCKTIME_MEDIAN_TIME_PAST)
? chainActive.Tip()->GetMedianTimePast()
: GetAdjustedTime();
return ContextualCheckTransaction(config, tx, state, nBlockHeight,
nLockTimeCutoff);
}
static bool ContextualCheckBlock(const Config &config, const CBlock &block,
CValidationState &state,
const CBlockIndex *pindexPrev) {
const int nHeight = pindexPrev == nullptr ? 0 : pindexPrev->nHeight + 1;
const Consensus::Params &consensusParams =
config.GetChainParams().GetConsensus();
// Start enforcing BIP113 (Median Time Past) using versionbits logic.
int nLockTimeFlags = 0;
if (VersionBitsState(pindexPrev, consensusParams, Consensus::DEPLOYMENT_CSV,
versionbitscache) == THRESHOLD_ACTIVE) {
nLockTimeFlags |= LOCKTIME_MEDIAN_TIME_PAST;
}
if (!IsMonolithEnabled(config, pindexPrev)) {
// When the May 15, 2018 HF is not enabled, block cannot be bigger
// than 8MB .
const uint64_t currentBlockSize =
::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
if (currentBlockSize > 8 * ONE_MEGABYTE) {
return state.DoS(100, false, REJECT_INVALID, "bad-blk-length",
false, "size limits failed");
}
}
const int64_t nMedianTimePast =
pindexPrev == nullptr ? 0 : pindexPrev->GetMedianTimePast();
const int64_t nLockTimeCutoff = (nLockTimeFlags & LOCKTIME_MEDIAN_TIME_PAST)
? nMedianTimePast
: block.GetBlockTime();
// Check that all transactions are finalized
for (const auto &tx : block.vtx) {
if (!ContextualCheckTransaction(config, *tx, state, nHeight,
nLockTimeCutoff)) {
// state set by ContextualCheckTransaction.
return false;
}
}
// Enforce rule that the coinbase starts with serialized block height
if (nHeight >= consensusParams.BIP34Height) {
CScript expect = CScript() << nHeight;
if (block.vtx[0]->vin[0].scriptSig.size() < expect.size() ||
!std::equal(expect.begin(), expect.end(),
block.vtx[0]->vin[0].scriptSig.begin())) {
return state.DoS(100, false, REJECT_INVALID, "bad-cb-height", false,
"block height mismatch in coinbase");
}
}
return true;
}
static bool AcceptBlockHeader(const Config &config, const CBlockHeader &block,
CValidationState &state, CBlockIndex **ppindex) {
AssertLockHeld(cs_main);
const CChainParams &chainparams = config.GetChainParams();
// Check for duplicate
uint256 hash = block.GetHash();
BlockMap::iterator miSelf = mapBlockIndex.find(hash);
CBlockIndex *pindex = nullptr;
if (hash != chainparams.GetConsensus().hashGenesisBlock) {
if (miSelf != mapBlockIndex.end()) {
// Block header is already known.
pindex = miSelf->second;
if (ppindex) {
*ppindex = pindex;
}
if (pindex->nStatus & BLOCK_FAILED_MASK) {
return state.Invalid(error("%s: block %s is marked invalid",
__func__, hash.ToString()),
0, "duplicate");
}
return true;
}
if (!CheckBlockHeader(config, block, state)) {
return error("%s: Consensus::CheckBlockHeader: %s, %s", __func__,
hash.ToString(), FormatStateMessage(state));
}
// Get prev block index
CBlockIndex *pindexPrev = nullptr;
BlockMap::iterator mi = mapBlockIndex.find(block.hashPrevBlock);
if (mi == mapBlockIndex.end()) {
return state.DoS(10, error("%s: prev block not found", __func__), 0,
"prev-blk-not-found");
}
pindexPrev = (*mi).second;
if (pindexPrev->nStatus & BLOCK_FAILED_MASK) {
return state.DoS(100, error("%s: prev block invalid", __func__),
REJECT_INVALID, "bad-prevblk");
}
assert(pindexPrev);
if (fCheckpointsEnabled &&
!CheckIndexAgainstCheckpoint(pindexPrev, state, chainparams,
hash)) {
return error("%s: CheckIndexAgainstCheckpoint(): %s", __func__,
state.GetRejectReason().c_str());
}
if (!ContextualCheckBlockHeader(config, block, state, pindexPrev,
GetAdjustedTime())) {
return error("%s: Consensus::ContextualCheckBlockHeader: %s, %s",
__func__, hash.ToString(), FormatStateMessage(state));
}
}
if (pindex == nullptr) {
pindex = AddToBlockIndex(block);
}
if (ppindex) {
*ppindex = pindex;
}
CheckBlockIndex(chainparams.GetConsensus());
return true;
}
// Exposed wrapper for AcceptBlockHeader
bool ProcessNewBlockHeaders(const Config &config,
const std::vector &headers,
CValidationState &state,
const CBlockIndex **ppindex) {
{
LOCK(cs_main);
for (const CBlockHeader &header : headers) {
// Use a temp pindex instead of ppindex to avoid a const_cast
CBlockIndex *pindex = nullptr;
if (!AcceptBlockHeader(config, header, state, &pindex)) {
return false;
}
if (ppindex) {
*ppindex = pindex;
}
}
}
NotifyHeaderTip();
return true;
}
/**
* Store block on disk. If dbp is non-null, the file is known to already reside
* on disk.
*/
static bool AcceptBlock(const Config &config,
const std::shared_ptr &pblock,
CValidationState &state, CBlockIndex **ppindex,
bool fRequested, const CDiskBlockPos *dbp,
bool *fNewBlock) {
AssertLockHeld(cs_main);
const CBlock &block = *pblock;
if (fNewBlock) {
*fNewBlock = false;
}
CBlockIndex *pindexDummy = nullptr;
CBlockIndex *&pindex = ppindex ? *ppindex : pindexDummy;
if (!AcceptBlockHeader(config, block, state, &pindex)) {
return false;
}
// Try to process all requested blocks that we don't have, but only
// process an unrequested block if it's new and has enough work to
// advance our tip, and isn't too many blocks ahead.
bool fAlreadyHave = pindex->nStatus & BLOCK_HAVE_DATA;
bool fHasMoreWork =
(chainActive.Tip() ? pindex->nChainWork > chainActive.Tip()->nChainWork
: true);
// Blocks that are too out-of-order needlessly limit the effectiveness of
// pruning, because pruning will not delete block files that contain any
// blocks which are too close in height to the tip. Apply this test
// regardless of whether pruning is enabled; it should generally be safe to
// not process unrequested blocks.
bool fTooFarAhead =
(pindex->nHeight > int(chainActive.Height() + MIN_BLOCKS_TO_KEEP));
// TODO: Decouple this function from the block download logic by removing
// fRequested
// This requires some new chain datastructure to efficiently look up if a
// block is in a chain leading to a candidate for best tip, despite not
// being such a candidate itself.
// TODO: deal better with return value and error conditions for duplicate
// and unrequested blocks.
if (fAlreadyHave) {
return true;
}
// If we didn't ask for it:
if (!fRequested) {
// This is a previously-processed block that was pruned.
if (pindex->nTx != 0) {
return true;
}
// Don't process less-work chains.
if (!fHasMoreWork) {
return true;
}
// Block height is too high.
if (fTooFarAhead) {
return true;
}
}
if (fNewBlock) {
*fNewBlock = true;
}
if (!CheckBlock(config, block, state) ||
!ContextualCheckBlock(config, block, state, pindex->pprev)) {
if (state.IsInvalid() && !state.CorruptionPossible()) {
pindex->nStatus |= BLOCK_FAILED_VALID;
setDirtyBlockIndex.insert(pindex);
}
return error("%s: %s (block %s)", __func__, FormatStateMessage(state),
block.GetHash().ToString());
}
// Header is valid/has work, merkle tree and segwit merkle tree are
// good...RELAY NOW (but if it does not build on our best tip, let the
// SendMessages loop relay it)
if (!IsInitialBlockDownload() && chainActive.Tip() == pindex->pprev) {
GetMainSignals().NewPoWValidBlock(pindex, pblock);
}
int nHeight = pindex->nHeight;
const CChainParams &chainparams = config.GetChainParams();
// Write block to history file
try {
unsigned int nBlockSize =
::GetSerializeSize(block, SER_DISK, CLIENT_VERSION);
CDiskBlockPos blockPos;
if (dbp != nullptr) {
blockPos = *dbp;
}
if (!FindBlockPos(state, blockPos, nBlockSize + 8, nHeight,
block.GetBlockTime(), dbp != nullptr)) {
return error("AcceptBlock(): FindBlockPos failed");
}
if (dbp == nullptr) {
if (!WriteBlockToDisk(block, blockPos, chainparams.DiskMagic())) {
AbortNode(state, "Failed to write block");
}
}
if (!ReceivedBlockTransactions(block, state, pindex, blockPos)) {
return error("AcceptBlock(): ReceivedBlockTransactions failed");
}
} catch (const std::runtime_error &e) {
return AbortNode(state, std::string("System error: ") + e.what());
}
if (fCheckForPruning) {
// we just allocated more disk space for block files.
FlushStateToDisk(config.GetChainParams(), state, FLUSH_STATE_NONE);
}
return true;
}
bool ProcessNewBlock(const Config &config,
const std::shared_ptr pblock,
bool fForceProcessing, bool *fNewBlock) {
{
CBlockIndex *pindex = nullptr;
if (fNewBlock) *fNewBlock = false;
const CChainParams &chainparams = config.GetChainParams();
CValidationState state;
// Ensure that CheckBlock() passes before calling AcceptBlock, as
// belt-and-suspenders.
bool ret = CheckBlock(config, *pblock, state);
LOCK(cs_main);
if (ret) {
// Store to disk
ret = AcceptBlock(config, pblock, state, &pindex, fForceProcessing,
nullptr, fNewBlock);
}
CheckBlockIndex(chainparams.GetConsensus());
if (!ret) {
GetMainSignals().BlockChecked(*pblock, state);
return error("%s: AcceptBlock FAILED", __func__);
}
}
NotifyHeaderTip();
// Only used to report errors, not invalidity - ignore it
CValidationState state;
if (!ActivateBestChain(config, state, pblock))
return error("%s: ActivateBestChain failed", __func__);
return true;
}
bool TestBlockValidity(const Config &config, CValidationState &state,
const CBlock &block, CBlockIndex *pindexPrev,
bool fCheckPOW, bool fCheckMerkleRoot) {
AssertLockHeld(cs_main);
const CChainParams &chainparams = config.GetChainParams();
assert(pindexPrev && pindexPrev == chainActive.Tip());
if (fCheckpointsEnabled &&
!CheckIndexAgainstCheckpoint(pindexPrev, state, chainparams,
block.GetHash())) {
return error("%s: CheckIndexAgainstCheckpoint(): %s", __func__,
state.GetRejectReason().c_str());
}
CCoinsViewCache viewNew(pcoinsTip);
CBlockIndex indexDummy(block);
indexDummy.pprev = pindexPrev;
indexDummy.nHeight = pindexPrev->nHeight + 1;
// NOTE: CheckBlockHeader is called by CheckBlock
if (!ContextualCheckBlockHeader(config, block, state, pindexPrev,
GetAdjustedTime())) {
return error("%s: Consensus::ContextualCheckBlockHeader: %s", __func__,
FormatStateMessage(state));
}
if (!CheckBlock(config, block, state, fCheckPOW, fCheckMerkleRoot)) {
return error("%s: Consensus::CheckBlock: %s", __func__,
FormatStateMessage(state));
}
if (!ContextualCheckBlock(config, block, state, pindexPrev)) {
return error("%s: Consensus::ContextualCheckBlock: %s", __func__,
FormatStateMessage(state));
}
if (!ConnectBlock(config, block, state, &indexDummy, viewNew, true)) {
return false;
}
assert(state.IsValid());
return true;
}
/**
* BLOCK PRUNING CODE
*/
/* Calculate the amount of disk space the block & undo files currently use */
static uint64_t CalculateCurrentUsage() {
uint64_t retval = 0;
for (const CBlockFileInfo &file : vinfoBlockFile) {
retval += file.nSize + file.nUndoSize;
}
return retval;
}
/* Prune a block file (modify associated database entries)*/
void PruneOneBlockFile(const int fileNumber) {
for (BlockMap::iterator it = mapBlockIndex.begin();
it != mapBlockIndex.end(); ++it) {
CBlockIndex *pindex = it->second;
if (pindex->nFile == fileNumber) {
pindex->nStatus &= ~BLOCK_HAVE_DATA;
pindex->nStatus &= ~BLOCK_HAVE_UNDO;
pindex->nFile = 0;
pindex->nDataPos = 0;
pindex->nUndoPos = 0;
setDirtyBlockIndex.insert(pindex);
// Prune from mapBlocksUnlinked -- any block we prune would have
// to be downloaded again in order to consider its chain, at which
// point it would be considered as a candidate for
// mapBlocksUnlinked or setBlockIndexCandidates.
std::pair::iterator,
std::multimap::iterator>
range = mapBlocksUnlinked.equal_range(pindex->pprev);
while (range.first != range.second) {
std::multimap::iterator _it =
range.first;
range.first++;
if (_it->second == pindex) {
mapBlocksUnlinked.erase(_it);
}
}
}
}
vinfoBlockFile[fileNumber].SetNull();
setDirtyFileInfo.insert(fileNumber);
}
void UnlinkPrunedFiles(const std::set &setFilesToPrune) {
for (std::set::iterator it = setFilesToPrune.begin();
it != setFilesToPrune.end(); ++it) {
CDiskBlockPos pos(*it, 0);
fs::remove(GetBlockPosFilename(pos, "blk"));
fs::remove(GetBlockPosFilename(pos, "rev"));
LogPrintf("Prune: %s deleted blk/rev (%05u)\n", __func__, *it);
}
}
/**
* Calculate the block/rev files to delete based on height specified by user
* with RPC command pruneblockchain
*/
static void FindFilesToPruneManual(std::set &setFilesToPrune,
int nManualPruneHeight) {
assert(fPruneMode && nManualPruneHeight > 0);
LOCK2(cs_main, cs_LastBlockFile);
if (chainActive.Tip() == nullptr) {
return;
}
// last block to prune is the lesser of (user-specified height,
// MIN_BLOCKS_TO_KEEP from the tip)
unsigned int nLastBlockWeCanPrune =
std::min((unsigned)nManualPruneHeight,
chainActive.Tip()->nHeight - MIN_BLOCKS_TO_KEEP);
int count = 0;
for (int fileNumber = 0; fileNumber < nLastBlockFile; fileNumber++) {
if (vinfoBlockFile[fileNumber].nSize == 0 ||
vinfoBlockFile[fileNumber].nHeightLast > nLastBlockWeCanPrune) {
continue;
}
PruneOneBlockFile(fileNumber);
setFilesToPrune.insert(fileNumber);
count++;
}
LogPrintf("Prune (Manual): prune_height=%d removed %d blk/rev pairs\n",
nLastBlockWeCanPrune, count);
}
/* This function is called from the RPC code for pruneblockchain */
void PruneBlockFilesManual(int nManualPruneHeight) {
CValidationState state;
const CChainParams &chainparams = Params();
FlushStateToDisk(chainparams, state, FLUSH_STATE_NONE, nManualPruneHeight);
}
/**
* Prune block and undo files (blk???.dat and undo???.dat) so that the disk
* space used is less than a user-defined target. The user sets the target (in
* MB) on the command line or in config file. This will be run on startup and
* whenever new space is allocated in a block or undo file, staying below the
* target. Changing back to unpruned requires a reindex (which in this case
* means the blockchain must be re-downloaded.)
*
* Pruning functions are called from FlushStateToDisk when the global
* fCheckForPruning flag has been set. Block and undo files are deleted in
* lock-step (when blk00003.dat is deleted, so is rev00003.dat.). Pruning cannot
* take place until the longest chain is at least a certain length (100000 on
* mainnet, 1000 on testnet, 1000 on regtest). Pruning will never delete a block
* within a defined distance (currently 288) from the active chain's tip. The
* block index is updated by unsetting HAVE_DATA and HAVE_UNDO for any blocks
* that were stored in the deleted files. A db flag records the fact that at
* least some block files have been pruned.
*
* @param[out] setFilesToPrune The set of file indices that can be unlinked
* will be returned
*/
static void FindFilesToPrune(std::set &setFilesToPrune,
uint64_t nPruneAfterHeight) {
LOCK2(cs_main, cs_LastBlockFile);
if (chainActive.Tip() == nullptr || nPruneTarget == 0) {
return;
}
if (uint64_t(chainActive.Tip()->nHeight) <= nPruneAfterHeight) {
return;
}
unsigned int nLastBlockWeCanPrune =
chainActive.Tip()->nHeight - MIN_BLOCKS_TO_KEEP;
uint64_t nCurrentUsage = CalculateCurrentUsage();
// We don't check to prune until after we've allocated new space for files,
// so we should leave a buffer under our target to account for another
// allocation before the next pruning.
uint64_t nBuffer = BLOCKFILE_CHUNK_SIZE + UNDOFILE_CHUNK_SIZE;
uint64_t nBytesToPrune;
int count = 0;
if (nCurrentUsage + nBuffer >= nPruneTarget) {
for (int fileNumber = 0; fileNumber < nLastBlockFile; fileNumber++) {
nBytesToPrune = vinfoBlockFile[fileNumber].nSize +
vinfoBlockFile[fileNumber].nUndoSize;
if (vinfoBlockFile[fileNumber].nSize == 0) {
continue;
}
// are we below our target?
if (nCurrentUsage + nBuffer < nPruneTarget) {
break;
}
// don't prune files that could have a block within
// MIN_BLOCKS_TO_KEEP of the main chain's tip but keep scanning
if (vinfoBlockFile[fileNumber].nHeightLast > nLastBlockWeCanPrune) {
continue;
}
PruneOneBlockFile(fileNumber);
// Queue up the files for removal
setFilesToPrune.insert(fileNumber);
nCurrentUsage -= nBytesToPrune;
count++;
}
}
LogPrint(BCLog::PRUNE, "Prune: target=%dMiB actual=%dMiB diff=%dMiB "
"max_prune_height=%d removed %d blk/rev pairs\n",
nPruneTarget / 1024 / 1024, nCurrentUsage / 1024 / 1024,
((int64_t)nPruneTarget - (int64_t)nCurrentUsage) / 1024 / 1024,
nLastBlockWeCanPrune, count);
}
bool CheckDiskSpace(uint64_t nAdditionalBytes) {
uint64_t nFreeBytesAvailable = fs::space(GetDataDir()).available;
// Check for nMinDiskSpace bytes (currently 50MB)
if (nFreeBytesAvailable < nMinDiskSpace + nAdditionalBytes)
return AbortNode("Disk space is low!", _("Error: Disk space is low!"));
return true;
}
static FILE *OpenDiskFile(const CDiskBlockPos &pos, const char *prefix,
bool fReadOnly) {
if (pos.IsNull()) {
return nullptr;
}
fs::path path = GetBlockPosFilename(pos, prefix);
fs::create_directories(path.parent_path());
FILE *file = fsbridge::fopen(path, "rb+");
if (!file && !fReadOnly) {
file = fsbridge::fopen(path, "wb+");
}
if (!file) {
LogPrintf("Unable to open file %s\n", path.string());
return nullptr;
}
if (pos.nPos) {
if (fseek(file, pos.nPos, SEEK_SET)) {
LogPrintf("Unable to seek to position %u of %s\n", pos.nPos,
path.string());
fclose(file);
return nullptr;
}
}
return file;
}
FILE *OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly) {
return OpenDiskFile(pos, "blk", fReadOnly);
}
/** Open an undo file (rev?????.dat) */
static FILE *OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly) {
return OpenDiskFile(pos, "rev", fReadOnly);
}
fs::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix) {
return GetDataDir() / "blocks" / strprintf("%s%05u.dat", prefix, pos.nFile);
}
CBlockIndex *InsertBlockIndex(uint256 hash) {
if (hash.IsNull()) return nullptr;
// Return existing
BlockMap::iterator mi = mapBlockIndex.find(hash);
if (mi != mapBlockIndex.end()) return (*mi).second;
// Create new
CBlockIndex *pindexNew = new CBlockIndex();
if (!pindexNew)
throw std::runtime_error(std::string(__func__) +
": new CBlockIndex failed");
mi = mapBlockIndex.insert(std::make_pair(hash, pindexNew)).first;
pindexNew->phashBlock = &((*mi).first);
return pindexNew;
}
static bool LoadBlockIndexDB(const CChainParams &chainparams) {
if (!pblocktree->LoadBlockIndexGuts(InsertBlockIndex)) return false;
boost::this_thread::interruption_point();
// Calculate nChainWork
std::vector> vSortedByHeight;
vSortedByHeight.reserve(mapBlockIndex.size());
for (const std::pair &item : mapBlockIndex) {
CBlockIndex *pindex = item.second;
vSortedByHeight.push_back(std::make_pair(pindex->nHeight, pindex));
}
sort(vSortedByHeight.begin(), vSortedByHeight.end());
for (const std::pair &item : vSortedByHeight) {
CBlockIndex *pindex = item.second;
pindex->nChainWork = (pindex->pprev ? pindex->pprev->nChainWork : 0) +
GetBlockProof(*pindex);
pindex->nTimeMax =
(pindex->pprev ? std::max(pindex->pprev->nTimeMax, pindex->nTime)
: pindex->nTime);
// We can link the chain of blocks for which we've received transactions
// at some point. Pruned nodes may have deleted the block.
if (pindex->nTx > 0) {
if (pindex->pprev) {
if (pindex->pprev->nChainTx) {
pindex->nChainTx = pindex->pprev->nChainTx + pindex->nTx;
} else {
pindex->nChainTx = 0;
mapBlocksUnlinked.insert(
std::make_pair(pindex->pprev, pindex));
}
} else {
pindex->nChainTx = pindex->nTx;
}
}
if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS) &&
(pindex->nChainTx || pindex->pprev == nullptr)) {
setBlockIndexCandidates.insert(pindex);
}
if (pindex->nStatus & BLOCK_FAILED_MASK &&
(!pindexBestInvalid ||
pindex->nChainWork > pindexBestInvalid->nChainWork)) {
pindexBestInvalid = pindex;
}
if (pindex->pprev) {
pindex->BuildSkip();
}
if (pindex->IsValid(BLOCK_VALID_TREE) &&
(pindexBestHeader == nullptr ||
CBlockIndexWorkComparator()(pindexBestHeader, pindex))) {
pindexBestHeader = pindex;
}
}
// Load block file info
pblocktree->ReadLastBlockFile(nLastBlockFile);
vinfoBlockFile.resize(nLastBlockFile + 1);
LogPrintf("%s: last block file = %i\n", __func__, nLastBlockFile);
for (int nFile = 0; nFile <= nLastBlockFile; nFile++) {
pblocktree->ReadBlockFileInfo(nFile, vinfoBlockFile[nFile]);
}
LogPrintf("%s: last block file info: %s\n", __func__,
vinfoBlockFile[nLastBlockFile].ToString());
for (int nFile = nLastBlockFile + 1; true; nFile++) {
CBlockFileInfo info;
if (pblocktree->ReadBlockFileInfo(nFile, info)) {
vinfoBlockFile.push_back(info);
} else {
break;
}
}
// Check presence of blk files
LogPrintf("Checking all blk files are present...\n");
std::set setBlkDataFiles;
for (const std::pair &item : mapBlockIndex) {
CBlockIndex *pindex = item.second;
if (pindex->nStatus & BLOCK_HAVE_DATA) {
setBlkDataFiles.insert(pindex->nFile);
}
}
for (std::set::iterator it = setBlkDataFiles.begin();
it != setBlkDataFiles.end(); it++) {
CDiskBlockPos pos(*it, 0);
if (CAutoFile(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION)
.IsNull()) {
return false;
}
}
// Check whether we have ever pruned block & undo files
pblocktree->ReadFlag("prunedblockfiles", fHavePruned);
if (fHavePruned) {
LogPrintf(
"LoadBlockIndexDB(): Block files have previously been pruned\n");
}
// Check whether we need to continue reindexing
bool fReindexing = false;
pblocktree->ReadReindexing(fReindexing);
fReindex |= fReindexing;
// Check whether we have a transaction index
pblocktree->ReadFlag("txindex", fTxIndex);
LogPrintf("%s: transaction index %s\n", __func__,
fTxIndex ? "enabled" : "disabled");
return true;
}
void LoadChainTip(const CChainParams &chainparams) {
if (chainActive.Tip() &&
chainActive.Tip()->GetBlockHash() == pcoinsTip->GetBestBlock()) {
return;
}
// Load pointer to end of best chain
BlockMap::iterator it = mapBlockIndex.find(pcoinsTip->GetBestBlock());
if (it == mapBlockIndex.end()) {
return;
}
chainActive.SetTip(it->second);
PruneBlockIndexCandidates();
LogPrintf(
"Loaded best chain: hashBestChain=%s height=%d date=%s progress=%f\n",
chainActive.Tip()->GetBlockHash().ToString(), chainActive.Height(),
DateTimeStrFormat("%Y-%m-%d %H:%M:%S",
chainActive.Tip()->GetBlockTime()),
GuessVerificationProgress(chainparams.TxData(), chainActive.Tip()));
}
CVerifyDB::CVerifyDB() {
uiInterface.ShowProgress(_("Verifying blocks..."), 0);
}
CVerifyDB::~CVerifyDB() {
uiInterface.ShowProgress("", 100);
}
bool CVerifyDB::VerifyDB(const Config &config, CCoinsView *coinsview,
int nCheckLevel, int nCheckDepth) {
LOCK(cs_main);
if (chainActive.Tip() == nullptr || chainActive.Tip()->pprev == nullptr) {
return true;
}
// Verify blocks in the best chain
if (nCheckDepth <= 0) {
// suffices until the year 19000
nCheckDepth = 1000000000;
}
if (nCheckDepth > chainActive.Height()) {
nCheckDepth = chainActive.Height();
}
nCheckLevel = std::max(0, std::min(4, nCheckLevel));
LogPrintf("Verifying last %i blocks at level %i\n", nCheckDepth,
nCheckLevel);
CCoinsViewCache coins(coinsview);
CBlockIndex *pindexState = chainActive.Tip();
CBlockIndex *pindexFailure = nullptr;
int nGoodTransactions = 0;
CValidationState state;
int reportDone = 0;
LogPrintf("[0%%]...");
for (CBlockIndex *pindex = chainActive.Tip(); pindex && pindex->pprev;
pindex = pindex->pprev) {
boost::this_thread::interruption_point();
int percentageDone = std::max(
1, std::min(
99,
(int)(((double)(chainActive.Height() - pindex->nHeight)) /
(double)nCheckDepth * (nCheckLevel >= 4 ? 50 : 100))));
if (reportDone < percentageDone / 10) {
// report every 10% step
LogPrintf("[%d%%]...", percentageDone);
reportDone = percentageDone / 10;
}
uiInterface.ShowProgress(_("Verifying blocks..."), percentageDone);
if (pindex->nHeight < chainActive.Height() - nCheckDepth) {
break;
}
if (fPruneMode && !(pindex->nStatus & BLOCK_HAVE_DATA)) {
// If pruning, only go back as far as we have data.
LogPrintf("VerifyDB(): block verification stopping at height %d "
"(pruning, no data)\n",
pindex->nHeight);
break;
}
CBlock block;
// check level 0: read from disk
if (!ReadBlockFromDisk(block, pindex, config)) {
return error(
"VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s",
pindex->nHeight, pindex->GetBlockHash().ToString());
}
// check level 1: verify block validity
if (nCheckLevel >= 1 && !CheckBlock(config, block, state)) {
return error("%s: *** found bad block at %d, hash=%s (%s)\n",
__func__, pindex->nHeight,
pindex->GetBlockHash().ToString(),
FormatStateMessage(state));
}
// check level 2: verify undo validity
if (nCheckLevel >= 2 && pindex) {
CBlockUndo undo;
CDiskBlockPos pos = pindex->GetUndoPos();
if (!pos.IsNull()) {
if (!UndoReadFromDisk(undo, pos,
pindex->pprev->GetBlockHash())) {
return error(
"VerifyDB(): *** found bad undo data at %d, hash=%s\n",
pindex->nHeight, pindex->GetBlockHash().ToString());
}
}
}
// check level 3: check for inconsistencies during memory-only
// disconnect of tip blocks
if (nCheckLevel >= 3 && pindex == pindexState &&
(coins.DynamicMemoryUsage() + pcoinsTip->DynamicMemoryUsage()) <=
nCoinCacheUsage) {
assert(coins.GetBestBlock() == pindex->GetBlockHash());
DisconnectResult res = DisconnectBlock(block, pindex, coins);
if (res == DISCONNECT_FAILED) {
return error("VerifyDB(): *** irrecoverable inconsistency in "
"block data at %d, hash=%s",
pindex->nHeight,
pindex->GetBlockHash().ToString());
}
pindexState = pindex->pprev;
if (res == DISCONNECT_UNCLEAN) {
nGoodTransactions = 0;
pindexFailure = pindex;
} else {
nGoodTransactions += block.vtx.size();
}
}
if (ShutdownRequested()) {
return true;
}
}
if (pindexFailure) {
return error("VerifyDB(): *** coin database inconsistencies found "
"(last %i blocks, %i good transactions before that)\n",
chainActive.Height() - pindexFailure->nHeight + 1,
nGoodTransactions);
}
// check level 4: try reconnecting blocks
if (nCheckLevel >= 4) {
CBlockIndex *pindex = pindexState;
while (pindex != chainActive.Tip()) {
boost::this_thread::interruption_point();
uiInterface.ShowProgress(
_("Verifying blocks..."),
std::max(1,
std::min(99,
100 - (int)(((double)(chainActive.Height() -
pindex->nHeight)) /
(double)nCheckDepth * 50))));
pindex = chainActive.Next(pindex);
CBlock block;
if (!ReadBlockFromDisk(block, pindex, config)) {
return error(
"VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s",
pindex->nHeight, pindex->GetBlockHash().ToString());
}
if (!ConnectBlock(config, block, state, pindex, coins)) {
return error(
"VerifyDB(): *** found unconnectable block at %d, hash=%s",
pindex->nHeight, pindex->GetBlockHash().ToString());
}
}
}
LogPrintf("[DONE].\n");
LogPrintf("No coin database inconsistencies in last %i blocks (%i "
"transactions)\n",
chainActive.Height() - pindexState->nHeight, nGoodTransactions);
return true;
}
/**
* Apply the effects of a block on the utxo cache, ignoring that it may already
* have been applied.
*/
static bool RollforwardBlock(const CBlockIndex *pindex, CCoinsViewCache &inputs,
const Config &config) {
// TODO: merge with ConnectBlock
CBlock block;
if (!ReadBlockFromDisk(block, pindex, config)) {
return error("ReplayBlock(): ReadBlockFromDisk failed at %d, hash=%s",
pindex->nHeight, pindex->GetBlockHash().ToString());
}
for (const CTransactionRef &tx : block.vtx) {
if (!tx->IsCoinBase()) {
for (const CTxIn &txin : tx->vin) {
inputs.SpendCoin(txin.prevout);
}
}
// Pass check = true as every addition may be an overwrite.
AddCoins(inputs, *tx, pindex->nHeight, true);
}
return true;
}
bool ReplayBlocks(const Config &config, CCoinsView *view) {
LOCK(cs_main);
CCoinsViewCache cache(view);
std::vector hashHeads = view->GetHeadBlocks();
if (hashHeads.empty()) {
// We're already in a consistent state.
return true;
}
if (hashHeads.size() != 2) {
return error("ReplayBlocks(): unknown inconsistent state");
}
uiInterface.ShowProgress(_("Replaying blocks..."), 0);
LogPrintf("Replaying blocks\n");
// Old tip during the interrupted flush.
const CBlockIndex *pindexOld = nullptr;
// New tip during the interrupted flush.
const CBlockIndex *pindexNew;
// Latest block common to both the old and the new tip.
const CBlockIndex *pindexFork = nullptr;
if (mapBlockIndex.count(hashHeads[0]) == 0) {
return error(
"ReplayBlocks(): reorganization to unknown block requested");
}
pindexNew = mapBlockIndex[hashHeads[0]];
if (!hashHeads[1].IsNull()) {
// The old tip is allowed to be 0, indicating it's the first flush.
if (mapBlockIndex.count(hashHeads[1]) == 0) {
return error(
"ReplayBlocks(): reorganization from unknown block requested");
}
pindexOld = mapBlockIndex[hashHeads[1]];
pindexFork = LastCommonAncestor(pindexOld, pindexNew);
assert(pindexFork != nullptr);
}
// Rollback along the old branch.
while (pindexOld != pindexFork) {
if (pindexOld->nHeight > 0) {
// Never disconnect the genesis block.
CBlock block;
if (!ReadBlockFromDisk(block, pindexOld, config)) {
return error("RollbackBlock(): ReadBlockFromDisk() failed at "
"%d, hash=%s",
pindexOld->nHeight,
pindexOld->GetBlockHash().ToString());
}
LogPrintf("Rolling back %s (%i)\n",
pindexOld->GetBlockHash().ToString(), pindexOld->nHeight);
DisconnectResult res = DisconnectBlock(block, pindexOld, cache);
if (res == DISCONNECT_FAILED) {
return error(
"RollbackBlock(): DisconnectBlock failed at %d, hash=%s",
pindexOld->nHeight, pindexOld->GetBlockHash().ToString());
}
// If DISCONNECT_UNCLEAN is returned, it means a non-existing UTXO
// was deleted, or an existing UTXO was overwritten. It corresponds
// to cases where the block-to-be-disconnect never had all its
// operations applied to the UTXO set. However, as both writing a
// UTXO and deleting a UTXO are idempotent operations, the result is
// still a version of the UTXO set with the effects of that block
// undone.
}
pindexOld = pindexOld->pprev;
}
// Roll forward from the forking point to the new tip.
int nForkHeight = pindexFork ? pindexFork->nHeight : 0;
for (int nHeight = nForkHeight + 1; nHeight <= pindexNew->nHeight;
++nHeight) {
const CBlockIndex *pindex = pindexNew->GetAncestor(nHeight);
LogPrintf("Rolling forward %s (%i)\n",
pindex->GetBlockHash().ToString(), nHeight);
if (!RollforwardBlock(pindex, cache, config)) {
return false;
}
}
cache.SetBestBlock(pindexNew->GetBlockHash());
cache.Flush();
uiInterface.ShowProgress("", 100);
return true;
}
bool RewindBlockIndex(const Config &config) {
LOCK(cs_main);
const CChainParams ¶ms = config.GetChainParams();
int nHeight = chainActive.Height() + 1;
// nHeight is now the height of the first insufficiently-validated block, or
// tipheight + 1
CValidationState state;
CBlockIndex *pindex = chainActive.Tip();
while (chainActive.Height() >= nHeight) {
if (fPruneMode && !(chainActive.Tip()->nStatus & BLOCK_HAVE_DATA)) {
// If pruning, don't try rewinding past the HAVE_DATA point; since
// older blocks can't be served anyway, there's no need to walk
// further, and trying to DisconnectTip() will fail (and require a
// needless reindex/redownload of the blockchain).
break;
}
if (!DisconnectTip(config, state, nullptr)) {
return error(
"RewindBlockIndex: unable to disconnect block at height %i",
pindex->nHeight);
}
// Occasionally flush state to disk.
if (!FlushStateToDisk(params, state, FLUSH_STATE_PERIODIC)) {
return false;
}
}
// Reduce validity flag and have-data flags.
// We do this after actual disconnecting, otherwise we'll end up writing the
// lack of data to disk before writing the chainstate, resulting in a
// failure to continue if interrupted.
for (BlockMap::iterator it = mapBlockIndex.begin();
it != mapBlockIndex.end(); it++) {
CBlockIndex *pindexIter = it->second;
if (pindexIter->IsValid(BLOCK_VALID_TRANSACTIONS) &&
pindexIter->nChainTx) {
setBlockIndexCandidates.insert(pindexIter);
}
}
PruneBlockIndexCandidates();
CheckBlockIndex(params.GetConsensus());
if (!FlushStateToDisk(params, state, FLUSH_STATE_ALWAYS)) {
return false;
}
return true;
}
// May NOT be used after any connections are up as much of the peer-processing
// logic assumes a consistent block index state
void UnloadBlockIndex() {
LOCK(cs_main);
setBlockIndexCandidates.clear();
chainActive.SetTip(nullptr);
pindexBestInvalid = nullptr;
pindexBestHeader = nullptr;
mempool.clear();
mapBlocksUnlinked.clear();
vinfoBlockFile.clear();
nLastBlockFile = 0;
nBlockSequenceId = 1;
setDirtyBlockIndex.clear();
setDirtyFileInfo.clear();
versionbitscache.Clear();
for (int b = 0; b < VERSIONBITS_NUM_BITS; b++) {
warningcache[b].clear();
}
for (BlockMap::value_type &entry : mapBlockIndex) {
delete entry.second;
}
mapBlockIndex.clear();
fHavePruned = false;
}
bool LoadBlockIndex(const CChainParams &chainparams) {
// Load block index from databases
if (!fReindex && !LoadBlockIndexDB(chainparams)) {
return false;
}
return true;
}
bool InitBlockIndex(const Config &config) {
LOCK(cs_main);
// Check whether we're already initialized
if (chainActive.Genesis() != nullptr) {
return true;
}
// Use the provided setting for -txindex in the new database
fTxIndex = gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX);
pblocktree->WriteFlag("txindex", fTxIndex);
LogPrintf("Initializing databases...\n");
// Only add the genesis block if not reindexing (in which case we reuse the
// one already on disk)
if (!fReindex) {
try {
const CChainParams &chainparams = config.GetChainParams();
CBlock &block = const_cast(chainparams.GenesisBlock());
// Start new block file
unsigned int nBlockSize =
::GetSerializeSize(block, SER_DISK, CLIENT_VERSION);
CDiskBlockPos blockPos;
CValidationState state;
if (!FindBlockPos(state, blockPos, nBlockSize + 8, 0,
block.GetBlockTime())) {
return error("LoadBlockIndex(): FindBlockPos failed");
}
if (!WriteBlockToDisk(block, blockPos, chainparams.DiskMagic())) {
return error(
"LoadBlockIndex(): writing genesis block to disk failed");
}
CBlockIndex *pindex = AddToBlockIndex(block);
if (!ReceivedBlockTransactions(block, state, pindex, blockPos)) {
return error("LoadBlockIndex(): genesis block not accepted");
}
} catch (const std::runtime_error &e) {
return error(
"LoadBlockIndex(): failed to initialize block database: %s",
e.what());
}
}
return true;
}
bool LoadExternalBlockFile(const Config &config, FILE *fileIn,
CDiskBlockPos *dbp) {
// Map of disk positions for blocks with unknown parent (only used for
// reindex)
static std::multimap mapBlocksUnknownParent;
int64_t nStart = GetTimeMillis();
const CChainParams &chainparams = config.GetChainParams();
int nLoaded = 0;
try {
// This takes over fileIn and calls fclose() on it in the CBufferedFile
// destructor. Make sure we have at least 2*MAX_TX_SIZE space in there
// so any transaction can fit in the buffer.
CBufferedFile blkdat(fileIn, 2 * MAX_TX_SIZE, MAX_TX_SIZE + 8, SER_DISK,
CLIENT_VERSION);
uint64_t nRewind = blkdat.GetPos();
while (!blkdat.eof()) {
boost::this_thread::interruption_point();
blkdat.SetPos(nRewind);
// Start one byte further next time, in case of failure.
nRewind++;
// Remove former limit.
blkdat.SetLimit();
unsigned int nSize = 0;
try {
// Locate a header.
uint8_t buf[CMessageHeader::MESSAGE_START_SIZE];
blkdat.FindByte(chainparams.DiskMagic()[0]);
nRewind = blkdat.GetPos() + 1;
blkdat >> FLATDATA(buf);
if (memcmp(buf, std::begin(chainparams.DiskMagic()),
CMessageHeader::MESSAGE_START_SIZE)) {
continue;
}
// Read size.
blkdat >> nSize;
if (nSize < 80) {
continue;
}
} catch (const std::exception &) {
// No valid block header found; don't complain.
break;
}
try {
// read block
uint64_t nBlockPos = blkdat.GetPos();
if (dbp) {
dbp->nPos = nBlockPos;
}
blkdat.SetLimit(nBlockPos + nSize);
blkdat.SetPos(nBlockPos);
std::shared_ptr pblock = std::make_shared();
CBlock &block = *pblock;
blkdat >> block;
nRewind = blkdat.GetPos();
// detect out of order blocks, and store them for later
uint256 hash = block.GetHash();
if (hash != chainparams.GetConsensus().hashGenesisBlock &&
mapBlockIndex.find(block.hashPrevBlock) ==
mapBlockIndex.end()) {
LogPrint(BCLog::REINDEX,
"%s: Out of order block %s, parent %s not known\n",
__func__, hash.ToString(),
block.hashPrevBlock.ToString());
if (dbp) {
mapBlocksUnknownParent.insert(
std::make_pair(block.hashPrevBlock, *dbp));
}
continue;
}
// process in case the block isn't known yet
if (mapBlockIndex.count(hash) == 0 ||
(mapBlockIndex[hash]->nStatus & BLOCK_HAVE_DATA) == 0) {
LOCK(cs_main);
CValidationState state;
if (AcceptBlock(config, pblock, state, nullptr, true, dbp,
nullptr)) {
nLoaded++;
}
if (state.IsError()) {
break;
}
} else if (hash !=
chainparams.GetConsensus().hashGenesisBlock &&
mapBlockIndex[hash]->nHeight % 1000 == 0) {
LogPrint(
BCLog::REINDEX,
"Block Import: already had block %s at height %d\n",
hash.ToString(), mapBlockIndex[hash]->nHeight);
}
// Activate the genesis block so normal node progress can
// continue
if (hash == chainparams.GetConsensus().hashGenesisBlock) {
CValidationState state;
if (!ActivateBestChain(config, state)) {
break;
}
}
NotifyHeaderTip();
// Recursively process earlier encountered successors of this
// block
std::deque queue;
queue.push_back(hash);
while (!queue.empty()) {
uint256 head = queue.front();
queue.pop_front();
std::pair::iterator,
std::multimap::iterator>
range = mapBlocksUnknownParent.equal_range(head);
while (range.first != range.second) {
std::multimap::iterator it =
range.first;
std::shared_ptr pblockrecursive =
std::make_shared();
if (ReadBlockFromDisk(*pblockrecursive, it->second,
config)) {
LogPrint(
BCLog::REINDEX,
"%s: Processing out of order child %s of %s\n",
__func__, pblockrecursive->GetHash().ToString(),
head.ToString());
LOCK(cs_main);
CValidationState dummy;
if (AcceptBlock(config, pblockrecursive, dummy,
nullptr, true, &it->second,
nullptr)) {
nLoaded++;
queue.push_back(pblockrecursive->GetHash());
}
}
range.first++;
mapBlocksUnknownParent.erase(it);
NotifyHeaderTip();
}
}
} catch (const std::exception &e) {
LogPrintf("%s: Deserialize or I/O error - %s\n", __func__,
e.what());
}
}
} catch (const std::runtime_error &e) {
AbortNode(std::string("System error: ") + e.what());
}
if (nLoaded > 0) {
LogPrintf("Loaded %i blocks from external file in %dms\n", nLoaded,
GetTimeMillis() - nStart);
}
return nLoaded > 0;
}
static void CheckBlockIndex(const Consensus::Params &consensusParams) {
if (!fCheckBlockIndex) {
return;
}
LOCK(cs_main);
// During a reindex, we read the genesis block and call CheckBlockIndex
// before ActivateBestChain, so we have the genesis block in mapBlockIndex
// but no active chain. (A few of the tests when iterating the block tree
// require that chainActive has been initialized.)
if (chainActive.Height() < 0) {
assert(mapBlockIndex.size() <= 1);
return;
}
// Build forward-pointing map of the entire block tree.
std::multimap forward;
for (BlockMap::iterator it = mapBlockIndex.begin();
it != mapBlockIndex.end(); it++) {
forward.insert(std::make_pair(it->second->pprev, it->second));
}
assert(forward.size() == mapBlockIndex.size());
std::pair::iterator,
std::multimap::iterator>
rangeGenesis = forward.equal_range(nullptr);
CBlockIndex *pindex = rangeGenesis.first->second;
rangeGenesis.first++;
// There is only one index entry with parent nullptr.
assert(rangeGenesis.first == rangeGenesis.second);
// Iterate over the entire block tree, using depth-first search.
// Along the way, remember whether there are blocks on the path from genesis
// block being explored which are the first to have certain properties.
size_t nNodes = 0;
int nHeight = 0;
// Oldest ancestor of pindex which is invalid.
CBlockIndex *pindexFirstInvalid = nullptr;
// Oldest ancestor of pindex which does not have BLOCK_HAVE_DATA.
CBlockIndex *pindexFirstMissing = nullptr;
// Oldest ancestor of pindex for which nTx == 0.
CBlockIndex *pindexFirstNeverProcessed = nullptr;
// Oldest ancestor of pindex which does not have BLOCK_VALID_TREE
// (regardless of being valid or not).
CBlockIndex *pindexFirstNotTreeValid = nullptr;
// Oldest ancestor of pindex which does not have BLOCK_VALID_TRANSACTIONS
// (regardless of being valid or not).
CBlockIndex *pindexFirstNotTransactionsValid = nullptr;
// Oldest ancestor of pindex which does not have BLOCK_VALID_CHAIN
// (regardless of being valid or not).
CBlockIndex *pindexFirstNotChainValid = nullptr;
// Oldest ancestor of pindex which does not have BLOCK_VALID_SCRIPTS
// (regardless of being valid or not).
CBlockIndex *pindexFirstNotScriptsValid = nullptr;
while (pindex != nullptr) {
nNodes++;
if (pindexFirstInvalid == nullptr &&
pindex->nStatus & BLOCK_FAILED_VALID) {
pindexFirstInvalid = pindex;
}
if (pindexFirstMissing == nullptr &&
!(pindex->nStatus & BLOCK_HAVE_DATA)) {
pindexFirstMissing = pindex;
}
if (pindexFirstNeverProcessed == nullptr && pindex->nTx == 0) {
pindexFirstNeverProcessed = pindex;
}
if (pindex->pprev != nullptr && pindexFirstNotTreeValid == nullptr &&
(pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_TREE) {
pindexFirstNotTreeValid = pindex;
}
if (pindex->pprev != nullptr &&
pindexFirstNotTransactionsValid == nullptr &&
(pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_TRANSACTIONS) {
pindexFirstNotTransactionsValid = pindex;
}
if (pindex->pprev != nullptr && pindexFirstNotChainValid == nullptr &&
(pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_CHAIN) {
pindexFirstNotChainValid = pindex;
}
if (pindex->pprev != nullptr && pindexFirstNotScriptsValid == nullptr &&
(pindex->nStatus & BLOCK_VALID_MASK) < BLOCK_VALID_SCRIPTS) {
pindexFirstNotScriptsValid = pindex;
}
// Begin: actual consistency checks.
if (pindex->pprev == nullptr) {
// Genesis block checks.
// Genesis block's hash must match.
assert(pindex->GetBlockHash() == consensusParams.hashGenesisBlock);
// The current active chain's genesis block must be this block.
assert(pindex == chainActive.Genesis());
}
if (pindex->nChainTx == 0) {
// nSequenceId can't be set positive for blocks that aren't linked
// (negative is used for preciousblock)
assert(pindex->nSequenceId <= 0);
}
// VALID_TRANSACTIONS is equivalent to nTx > 0 for all nodes (whether or
// not pruning has occurred). HAVE_DATA is only equivalent to nTx > 0
// (or VALID_TRANSACTIONS) if no pruning has occurred.
if (!fHavePruned) {
// If we've never pruned, then HAVE_DATA should be equivalent to nTx
// > 0
assert(!(pindex->nStatus & BLOCK_HAVE_DATA) == (pindex->nTx == 0));
assert(pindexFirstMissing == pindexFirstNeverProcessed);
} else {
// If we have pruned, then we can only say that HAVE_DATA implies
// nTx > 0
if (pindex->nStatus & BLOCK_HAVE_DATA) assert(pindex->nTx > 0);
}
if (pindex->nStatus & BLOCK_HAVE_UNDO) {
assert(pindex->nStatus & BLOCK_HAVE_DATA);
}
// This is pruning-independent.
assert(((pindex->nStatus & BLOCK_VALID_MASK) >=
BLOCK_VALID_TRANSACTIONS) == (pindex->nTx > 0));
// All parents having had data (at some point) is equivalent to all
// parents being VALID_TRANSACTIONS, which is equivalent to nChainTx
// being set.
// nChainTx != 0 is used to signal that all parent blocks have been
// processed (but may have been pruned).
assert((pindexFirstNeverProcessed != nullptr) ==
(pindex->nChainTx == 0));
assert((pindexFirstNotTransactionsValid != nullptr) ==
(pindex->nChainTx == 0));
// nHeight must be consistent.
assert(pindex->nHeight == nHeight);
// For every block except the genesis block, the chainwork must be
// larger than the parent's.
assert(pindex->pprev == nullptr ||
pindex->nChainWork >= pindex->pprev->nChainWork);
// The pskip pointer must point back for all but the first 2 blocks.
assert(nHeight < 2 ||
(pindex->pskip && (pindex->pskip->nHeight < nHeight)));
// All mapBlockIndex entries must at least be TREE valid
assert(pindexFirstNotTreeValid == nullptr);
if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_TREE) {
// TREE valid implies all parents are TREE valid
assert(pindexFirstNotTreeValid == nullptr);
}
if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_CHAIN) {
// CHAIN valid implies all parents are CHAIN valid
assert(pindexFirstNotChainValid == nullptr);
}
if ((pindex->nStatus & BLOCK_VALID_MASK) >= BLOCK_VALID_SCRIPTS) {
// SCRIPTS valid implies all parents are SCRIPTS valid
assert(pindexFirstNotScriptsValid == nullptr);
}
if (pindexFirstInvalid == nullptr) {
// Checks for not-invalid blocks.
// The failed mask cannot be set for blocks without invalid parents.
assert((pindex->nStatus & BLOCK_FAILED_MASK) == 0);
}
if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) &&
pindexFirstNeverProcessed == nullptr) {
if (pindexFirstInvalid == nullptr) {
// If this block sorts at least as good as the current tip and
// is valid and we have all data for its parents, it must be in
// setBlockIndexCandidates. chainActive.Tip() must also be there
// even if some data has been pruned.
if (pindexFirstMissing == nullptr ||
pindex == chainActive.Tip()) {
assert(setBlockIndexCandidates.count(pindex));
}
// If some parent is missing, then it could be that this block
// was in setBlockIndexCandidates but had to be removed because
// of the missing data. In this case it must be in
// mapBlocksUnlinked -- see test below.
}
} else {
// If this block sorts worse than the current tip or some ancestor's
// block has never been seen, it cannot be in
// setBlockIndexCandidates.
assert(setBlockIndexCandidates.count(pindex) == 0);
}
// Check whether this block is in mapBlocksUnlinked.
std::pair::iterator,
std::multimap::iterator>
rangeUnlinked = mapBlocksUnlinked.equal_range(pindex->pprev);
bool foundInUnlinked = false;
while (rangeUnlinked.first != rangeUnlinked.second) {
assert(rangeUnlinked.first->first == pindex->pprev);
if (rangeUnlinked.first->second == pindex) {
foundInUnlinked = true;
break;
}
rangeUnlinked.first++;
}
if (pindex->pprev && (pindex->nStatus & BLOCK_HAVE_DATA) &&
pindexFirstNeverProcessed != nullptr &&
pindexFirstInvalid == nullptr) {
// If this block has block data available, some parent was never
// received, and has no invalid parents, it must be in
// mapBlocksUnlinked.
assert(foundInUnlinked);
}
if (!(pindex->nStatus & BLOCK_HAVE_DATA)) {
// Can't be in mapBlocksUnlinked if we don't HAVE_DATA
assert(!foundInUnlinked);
}
if (pindexFirstMissing == nullptr) {
// We aren't missing data for any parent -- cannot be in
// mapBlocksUnlinked.
assert(!foundInUnlinked);
}
if (pindex->pprev && (pindex->nStatus & BLOCK_HAVE_DATA) &&
pindexFirstNeverProcessed == nullptr &&
pindexFirstMissing != nullptr) {
// We HAVE_DATA for this block, have received data for all parents
// at some point, but we're currently missing data for some parent.
// We must have pruned.
assert(fHavePruned);
// This block may have entered mapBlocksUnlinked if:
// - it has a descendant that at some point had more work than the
// tip, and
// - we tried switching to that descendant but were missing
// data for some intermediate block between chainActive and the
// tip.
// So if this block is itself better than chainActive.Tip() and it
// wasn't in
// setBlockIndexCandidates, then it must be in mapBlocksUnlinked.
if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) &&
setBlockIndexCandidates.count(pindex) == 0) {
if (pindexFirstInvalid == nullptr) {
assert(foundInUnlinked);
}
}
}
// assert(pindex->GetBlockHash() == pindex->GetBlockHeader().GetHash());
// // Perhaps too slow
// End: actual consistency checks.
// Try descending into the first subnode.
std::pair::iterator,
std::multimap::iterator>
range = forward.equal_range(pindex);
if (range.first != range.second) {
// A subnode was found.
pindex = range.first->second;
nHeight++;
continue;
}
// This is a leaf node. Move upwards until we reach a node of which we
// have not yet visited the last child.
while (pindex) {
// We are going to either move to a parent or a sibling of pindex.
// If pindex was the first with a certain property, unset the
// corresponding variable.
if (pindex == pindexFirstInvalid) {
pindexFirstInvalid = nullptr;
}
if (pindex == pindexFirstMissing) {
pindexFirstMissing = nullptr;
}
if (pindex == pindexFirstNeverProcessed) {
pindexFirstNeverProcessed = nullptr;
}
if (pindex == pindexFirstNotTreeValid) {
pindexFirstNotTreeValid = nullptr;
}
if (pindex == pindexFirstNotTransactionsValid) {
pindexFirstNotTransactionsValid = nullptr;
}
if (pindex == pindexFirstNotChainValid) {
pindexFirstNotChainValid = nullptr;
}
if (pindex == pindexFirstNotScriptsValid) {
pindexFirstNotScriptsValid = nullptr;
}
// Find our parent.
CBlockIndex *pindexPar = pindex->pprev;
// Find which child we just visited.
std::pair::iterator,
std::multimap::iterator>
rangePar = forward.equal_range(pindexPar);
while (rangePar.first->second != pindex) {
// Our parent must have at least the node we're coming from as
// child.
assert(rangePar.first != rangePar.second);
rangePar.first++;
}
// Proceed to the next one.
rangePar.first++;
if (rangePar.first != rangePar.second) {
// Move to the sibling.
pindex = rangePar.first->second;
break;
} else {
// Move up further.
pindex = pindexPar;
nHeight--;
continue;
}
}
}
// Check that we actually traversed the entire map.
assert(nNodes == forward.size());
}
std::string CBlockFileInfo::ToString() const {
return strprintf(
"CBlockFileInfo(blocks=%u, size=%u, heights=%u...%u, time=%s...%s)",
nBlocks, nSize, nHeightFirst, nHeightLast,
DateTimeStrFormat("%Y-%m-%d", nTimeFirst),
DateTimeStrFormat("%Y-%m-%d", nTimeLast));
}
CBlockFileInfo *GetBlockFileInfo(size_t n) {
return &vinfoBlockFile.at(n);
}
ThresholdState VersionBitsTipState(const Consensus::Params ¶ms,
Consensus::DeploymentPos pos) {
LOCK(cs_main);
return VersionBitsState(chainActive.Tip(), params, pos, versionbitscache);
}
int VersionBitsTipStateSinceHeight(const Consensus::Params ¶ms,
Consensus::DeploymentPos pos) {
LOCK(cs_main);
return VersionBitsStateSinceHeight(chainActive.Tip(), params, pos,
versionbitscache);
}
static const uint64_t MEMPOOL_DUMP_VERSION = 1;
bool LoadMempool(const Config &config) {
int64_t nExpiryTimeout =
gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60;
FILE *filestr = fsbridge::fopen(GetDataDir() / "mempool.dat", "rb");
CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
if (file.IsNull()) {
LogPrintf(
"Failed to open mempool file from disk. Continuing anyway.\n");
return false;
}
int64_t count = 0;
int64_t skipped = 0;
int64_t failed = 0;
int64_t nNow = GetTime();
try {
uint64_t version;
file >> version;
if (version != MEMPOOL_DUMP_VERSION) {
return false;
}
uint64_t num;
file >> num;
double prioritydummy = 0;
while (num--) {
CTransactionRef tx;
int64_t nTime;
int64_t nFeeDelta;
file >> tx;
file >> nTime;
file >> nFeeDelta;
Amount amountdelta(nFeeDelta);
if (amountdelta != Amount(0)) {
mempool.PrioritiseTransaction(tx->GetId(),
tx->GetId().ToString(),
prioritydummy, amountdelta);
}
CValidationState state;
if (nTime + nExpiryTimeout > nNow) {
LOCK(cs_main);
AcceptToMemoryPoolWithTime(config, mempool, state, tx, true,
nullptr, nTime);
if (state.IsValid()) {
++count;
} else {
++failed;
}
} else {
++skipped;
}
if (ShutdownRequested()) return false;
}
std::map mapDeltas;
file >> mapDeltas;
for (const auto &i : mapDeltas) {
mempool.PrioritiseTransaction(i.first, i.first.ToString(),
prioritydummy, i.second);
}
} catch (const std::exception &e) {
LogPrintf("Failed to deserialize mempool data on disk: %s. Continuing "
"anyway.\n",
e.what());
return false;
}
LogPrintf("Imported mempool transactions from disk: %i successes, %i "
"failed, %i expired\n",
count, failed, skipped);
return true;
}
void DumpMempool(void) {
int64_t start = GetTimeMicros();
std::map mapDeltas;
std::vector vinfo;
{
LOCK(mempool.cs);
for (const auto &i : mempool.mapDeltas) {
mapDeltas[i.first] = i.second.second;
}
vinfo = mempool.infoAll();
}
int64_t mid = GetTimeMicros();
try {
FILE *filestr = fsbridge::fopen(GetDataDir() / "mempool.dat.new", "wb");
if (!filestr) {
return;
}
CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
uint64_t version = MEMPOOL_DUMP_VERSION;
file << version;
file << (uint64_t)vinfo.size();
for (const auto &i : vinfo) {
file << *(i.tx);
file << (int64_t)i.nTime;
file << (int64_t)i.nFeeDelta.GetSatoshis();
mapDeltas.erase(i.tx->GetId());
}
file << mapDeltas;
FileCommit(file.Get());
file.fclose();
RenameOver(GetDataDir() / "mempool.dat.new",
GetDataDir() / "mempool.dat");
int64_t last = GetTimeMicros();
LogPrintf("Dumped mempool: %gs to copy, %gs to dump\n",
(mid - start) * 0.000001, (last - mid) * 0.000001);
} catch (const std::exception &e) {
LogPrintf("Failed to dump mempool: %s. Continuing anyway.\n", e.what());
}
}
//! Guess how far we are in the verification process at the given block index
double GuessVerificationProgress(const ChainTxData &data, CBlockIndex *pindex) {
if (pindex == nullptr) return 0.0;
int64_t nNow = time(nullptr);
double fTxTotal;
if (pindex->nChainTx <= data.nTxCount) {
fTxTotal = data.nTxCount + (nNow - data.nTime) * data.dTxRate;
} else {
fTxTotal =
pindex->nChainTx + (nNow - pindex->GetBlockTime()) * data.dTxRate;
}
return pindex->nChainTx / fTxTotal;
}
class CMainCleanup {
public:
CMainCleanup() {}
~CMainCleanup() {
// block headers
BlockMap::iterator it1 = mapBlockIndex.begin();
for (; it1 != mapBlockIndex.end(); it1++)
delete (*it1).second;
mapBlockIndex.clear();
}
} instance_of_cmaincleanup;
diff --git a/test/functional/abc-p2p-compactblocks.py b/test/functional/abc-p2p-compactblocks.py
index 58232dff0..4cc40bd22 100755
--- a/test/functional/abc-p2p-compactblocks.py
+++ b/test/functional/abc-p2p-compactblocks.py
@@ -1,382 +1,383 @@
#!/usr/bin/env python3
# Copyright (c) 2015-2016 The Bitcoin Core developers
# Copyright (c) 2017 The Bitcoin developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""
This test checks simple acceptance of bigger blocks via p2p.
It is derived from the much more complex p2p-fullblocktest.
The intention is that small tests can be derived from this one, or
this one can be extended, to cover the checks done for bigger blocks
(e.g. sigops limits).
"""
from test_framework.test_framework import ComparisonTestFramework
from test_framework.util import *
from test_framework.comptool import TestManager, TestInstance, RejectResult
from test_framework.blocktools import *
import time
from test_framework.script import *
from test_framework.cdefs import (ONE_MEGABYTE, LEGACY_MAX_BLOCK_SIZE,
MAX_BLOCK_SIGOPS_PER_MB, MAX_TX_SIGOPS_COUNT)
from collections import deque
# far into the future
MONOLITH_START_TIME = 2000000000
class PreviousSpendableOutput():
def __init__(self, tx=CTransaction(), n=-1):
self.tx = tx
self.n = n # the output we're spending
# TestNode: A peer we use to send messages to bitcoind, and store responses.
class TestNode(NodeConnCB):
def __init__(self):
self.last_sendcmpct = None
self.last_cmpctblock = None
self.last_getheaders = None
self.last_headers = None
super().__init__()
def on_sendcmpct(self, conn, message):
self.last_sendcmpct = message
def on_cmpctblock(self, conn, message):
self.last_cmpctblock = message
self.last_cmpctblock.header_and_shortids.header.calc_sha256()
def on_getheaders(self, conn, message):
self.last_getheaders = message
def on_headers(self, conn, message):
self.last_headers = message
for x in self.last_headers.headers:
x.calc_sha256()
def clear_block_data(self):
with mininode_lock:
self.last_sendcmpct = None
self.last_cmpctblock = None
class FullBlockTest(ComparisonTestFramework):
# Can either run this test as 1 node with expected answers, or two and compare them.
# Change the "outcome" variable from each TestInstance object to only do
# the comparison.
def set_test_params(self):
self.num_nodes = 1
self.setup_clean_chain = True
self.block_heights = {}
self.tip = None
self.blocks = {}
self.excessive_block_size = 16 * ONE_MEGABYTE
self.extra_args = [['-norelaypriority',
'-whitelist=127.0.0.1',
'-limitancestorcount=999999',
'-limitancestorsize=999999',
'-limitdescendantcount=999999',
'-limitdescendantsize=999999',
'-maxmempool=99999',
+ "-monolithactivationtime=%d" % MONOLITH_START_TIME,
"-excessiveblocksize=%d"
% self.excessive_block_size]]
def add_options(self, parser):
super().add_options(parser)
parser.add_option(
"--runbarelyexpensive", dest="runbarelyexpensive", default=True)
def run_test(self):
self.test = TestManager(self, self.options.tmpdir)
self.test.add_all_connections(self.nodes)
# Start up network handling in another thread
NetworkThread().start()
# Set the blocksize to 2MB as initial condition
self.nodes[0].setexcessiveblock(self.excessive_block_size)
self.nodes[0].setmocktime(MONOLITH_START_TIME)
self.test.run()
def add_transactions_to_block(self, block, tx_list):
[tx.rehash() for tx in tx_list]
block.vtx.extend(tx_list)
# this is a little handier to use than the version in blocktools.py
def create_tx(self, spend_tx, n, value, script=CScript([OP_TRUE])):
tx = create_transaction(spend_tx, n, b"", value, script)
return tx
def next_block(self, number, spend=None, script=CScript([OP_TRUE]), block_size=0, extra_txns=0):
if self.tip == None:
base_block_hash = self.genesis_hash
block_time = int(time.time()) + 1
else:
base_block_hash = self.tip.sha256
block_time = self.tip.nTime + 1
# First create the coinbase
height = self.block_heights[base_block_hash] + 1
coinbase = create_coinbase(height)
coinbase.rehash()
if spend == None:
# We need to have something to spend to fill the block.
assert_equal(block_size, 0)
block = create_block(base_block_hash, coinbase, block_time)
else:
# all but one satoshi to fees
coinbase.vout[0].nValue += spend.tx.vout[spend.n].nValue - 1
coinbase.rehash()
block = create_block(base_block_hash, coinbase, block_time)
# Make sure we have plenty engough to spend going forward.
spendable_outputs = deque([spend])
def get_base_transaction():
# Create the new transaction
tx = CTransaction()
# Spend from one of the spendable outputs
spend = spendable_outputs.popleft()
tx.vin.append(CTxIn(COutPoint(spend.tx.sha256, spend.n)))
# Add spendable outputs
for i in range(4):
tx.vout.append(CTxOut(0, CScript([OP_TRUE])))
spendable_outputs.append(PreviousSpendableOutput(tx, i))
return tx
tx = get_base_transaction()
# Make it the same format as transaction added for padding and save the size.
# It's missing the padding output, so we add a constant to account for it.
tx.rehash()
base_tx_size = len(tx.serialize()) + 18
# If a specific script is required, add it.
if script != None:
tx.vout.append(CTxOut(1, script))
# Put some random data into the first transaction of the chain to randomize ids.
tx.vout.append(
CTxOut(0, CScript([random.randint(0, 256), OP_RETURN])))
# Add the transaction to the block
self.add_transactions_to_block(block, [tx])
# Add transaction until we reach the expected transaction count
for _ in range(extra_txns):
self.add_transactions_to_block(block, [get_base_transaction()])
# If we have a block size requirement, just fill
# the block until we get there
current_block_size = len(block.serialize())
while current_block_size < block_size:
# We will add a new transaction. That means the size of
# the field enumerating how many transaction go in the block
# may change.
current_block_size -= len(ser_compact_size(len(block.vtx)))
current_block_size += len(ser_compact_size(len(block.vtx) + 1))
# Create the new transaction
tx = get_base_transaction()
# Add padding to fill the block.
script_length = block_size - current_block_size - base_tx_size
if script_length > 510000:
if script_length < 1000000:
# Make sure we don't find ourselves in a position where we
# need to generate a transaction smaller than what we expected.
script_length = script_length // 2
else:
script_length = 500000
script_output = CScript([b'\x00' * script_length])
tx.vout.append(CTxOut(0, script_output))
# Add the tx to the list of transactions to be included
# in the block.
self.add_transactions_to_block(block, [tx])
current_block_size += len(tx.serialize())
# Now that we added a bunch of transaction, we need to recompute
# the merkle root.
block.hashMerkleRoot = block.calc_merkle_root()
# Check that the block size is what's expected
if block_size > 0:
assert_equal(len(block.serialize()), block_size)
# Do PoW, which is cheap on regnet
block.solve()
self.tip = block
self.block_heights[block.sha256] = height
assert number not in self.blocks
self.blocks[number] = block
return block
def get_tests(self):
self.genesis_hash = int(self.nodes[0].getbestblockhash(), 16)
self.block_heights[self.genesis_hash] = 0
spendable_outputs = []
# save the current tip so it can be spent by a later block
def save_spendable_output():
spendable_outputs.append(self.tip)
# get an output that we previously marked as spendable
def get_spendable_output():
return PreviousSpendableOutput(spendable_outputs.pop(0).vtx[0], 0)
# returns a test case that asserts that the current tip was accepted
def accepted():
return TestInstance([[self.tip, True]])
# returns a test case that asserts that the current tip was rejected
def rejected(reject=None):
if reject is None:
return TestInstance([[self.tip, False]])
else:
return TestInstance([[self.tip, reject]])
# move the tip back to a previous block
def tip(number):
self.tip = self.blocks[number]
# adds transactions to the block and updates state
def update_block(block_number, new_transactions):
block = self.blocks[block_number]
self.add_transactions_to_block(block, new_transactions)
old_sha256 = block.sha256
block.hashMerkleRoot = block.calc_merkle_root()
block.solve()
# Update the internal state just like in next_block
self.tip = block
if block.sha256 != old_sha256:
self.block_heights[
block.sha256] = self.block_heights[old_sha256]
del self.block_heights[old_sha256]
self.blocks[block_number] = block
return block
# shorthand for functions
block = self.next_block
# Create a new block
block(0)
save_spendable_output()
yield accepted()
# Now we need that block to mature so we can spend the coinbase.
test = TestInstance(sync_every_block=False)
for i in range(99):
block(5000 + i)
test.blocks_and_transactions.append([self.tip, True])
save_spendable_output()
# Fork block
bfork = block(5555)
bfork.nTime = MONOLITH_START_TIME
update_block(5555, [])
test.blocks_and_transactions.append([self.tip, True])
# Get to one block of the May 15, 2018 HF activation
for i in range(5):
block(5100 + i)
test.blocks_and_transactions.append([self.tip, True])
# Send it all to the node at once.
yield test
# collect spendable outputs now to avoid cluttering the code later on
out = []
for i in range(100):
out.append(get_spendable_output())
# Check that compact block also work for big blocks
node = self.nodes[0]
peer = TestNode()
peer.add_connection(NodeConn('127.0.0.1', p2p_port(0), node, peer))
# Start up network handling in another thread and wait for connection
# to be etablished
NetworkThread().start()
peer.wait_for_verack()
# Wait for SENDCMPCT
def received_sendcmpct():
return (peer.last_sendcmpct != None)
wait_until(received_sendcmpct, timeout=30)
sendcmpct = msg_sendcmpct()
sendcmpct.version = 1
sendcmpct.announce = True
peer.send_and_ping(sendcmpct)
# Exchange headers
def received_getheaders():
return (peer.last_getheaders != None)
wait_until(received_getheaders, timeout=30)
# Return the favor
peer.send_message(peer.last_getheaders)
# Wait for the header list
def received_headers():
return (peer.last_headers != None)
wait_until(received_headers, timeout=30)
# It's like we know about the same headers !
peer.send_message(peer.last_headers)
# Send a block
b1 = block(1, spend=out[0], block_size=ONE_MEGABYTE + 1)
yield accepted()
# Checks the node to forward it via compact block
def received_block():
return (peer.last_cmpctblock != None)
wait_until(received_block, timeout=30)
# Was it our block ?
cmpctblk_header = peer.last_cmpctblock.header_and_shortids.header
cmpctblk_header.calc_sha256()
assert(cmpctblk_header.sha256 == b1.sha256)
# Send a large block with numerous transactions.
peer.clear_block_data()
b2 = block(2, spend=out[1], extra_txns=70000,
block_size=self.excessive_block_size - 1000)
yield accepted()
# Checks the node forwards it via compact block
wait_until(received_block, timeout=30)
# Was it our block ?
cmpctblk_header = peer.last_cmpctblock.header_and_shortids.header
cmpctblk_header.calc_sha256()
assert(cmpctblk_header.sha256 == b2.sha256)
# In order to avoid having to resend a ton of transactions, we invalidate
# b2, which will send all its transactions in the mempool.
node.invalidateblock(node.getbestblockhash())
# Let's send a compact block and see if the node accepts it.
# Let's modify b2 and use it so that we can reuse the mempool.
tx = b2.vtx[0]
tx.vout.append(CTxOut(0, CScript([random.randint(0, 256), OP_RETURN])))
tx.rehash()
b2.vtx[0] = tx
b2.hashMerkleRoot = b2.calc_merkle_root()
b2.solve()
# Now we create the compact block and send it
comp_block = HeaderAndShortIDs()
comp_block.initialize_from_block(b2)
peer.send_and_ping(msg_cmpctblock(comp_block.to_p2p()))
# Check that compact block is received properly
assert(int(node.getbestblockhash(), 16) == b2.sha256)
if __name__ == '__main__':
FullBlockTest().main()
diff --git a/test/functional/abc-p2p-fullblocktest.py b/test/functional/abc-p2p-fullblocktest.py
index 0629fe7c8..6445d9adf 100755
--- a/test/functional/abc-p2p-fullblocktest.py
+++ b/test/functional/abc-p2p-fullblocktest.py
@@ -1,419 +1,429 @@
#!/usr/bin/env python3
# Copyright (c) 2015-2016 The Bitcoin Core developers
# Copyright (c) 2017 The Bitcoin developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""
This test checks simple acceptance of bigger blocks via p2p.
It is derived from the much more complex p2p-fullblocktest.
The intention is that small tests can be derived from this one, or
this one can be extended, to cover the checks done for bigger blocks
(e.g. sigops limits).
"""
from test_framework.test_framework import ComparisonTestFramework
from test_framework.util import *
from test_framework.comptool import TestManager, TestInstance, RejectResult
from test_framework.blocktools import *
import time
from test_framework.key import CECKey
from test_framework.script import *
from test_framework.cdefs import (ONE_MEGABYTE, LEGACY_MAX_BLOCK_SIZE,
MAX_BLOCK_SIGOPS_PER_MB, MAX_TX_SIGOPS_COUNT)
from collections import deque
# far into the future
MONOLITH_START_TIME = 2000000000
class PreviousSpendableOutput():
def __init__(self, tx=CTransaction(), n=-1):
self.tx = tx
self.n = n # the output we're spending
class FullBlockTest(ComparisonTestFramework):
# Can either run this test as 1 node with expected answers, or two and compare them.
# Change the "outcome" variable from each TestInstance object to only do
# the comparison.
def set_test_params(self):
self.num_nodes = 1
self.setup_clean_chain = True
self.block_heights = {}
self.tip = None
self.blocks = {}
self.excessive_block_size = 100 * ONE_MEGABYTE
self.extra_args = [['-whitelist=127.0.0.1',
+ "-monolithactivationtime=%d" % MONOLITH_START_TIME,
"-excessiveblocksize=%d"
% self.excessive_block_size]]
def add_options(self, parser):
super().add_options(parser)
parser.add_option(
"--runbarelyexpensive", dest="runbarelyexpensive", default=True)
def run_test(self):
self.test = TestManager(self, self.options.tmpdir)
self.test.add_all_connections(self.nodes)
# Start up network handling in another thread
NetworkThread().start()
# Set the blocksize to 2MB as initial condition
self.nodes[0].setexcessiveblock(self.excessive_block_size)
self.nodes[0].setmocktime(MONOLITH_START_TIME)
self.test.run()
def add_transactions_to_block(self, block, tx_list):
[tx.rehash() for tx in tx_list]
block.vtx.extend(tx_list)
# this is a little handier to use than the version in blocktools.py
def create_tx(self, spend_tx, n, value, script=CScript([OP_TRUE])):
tx = create_transaction(spend_tx, n, b"", value, script)
return tx
def next_block(self, number, spend=None, script=CScript([OP_TRUE]), block_size=0, extra_sigops=0):
if self.tip == None:
base_block_hash = self.genesis_hash
block_time = int(time.time()) + 1
else:
base_block_hash = self.tip.sha256
block_time = self.tip.nTime + 1
# First create the coinbase
height = self.block_heights[base_block_hash] + 1
coinbase = create_coinbase(height)
coinbase.rehash()
if spend == None:
# We need to have something to spend to fill the block.
assert_equal(block_size, 0)
block = create_block(base_block_hash, coinbase, block_time)
else:
# all but one satoshi to fees
coinbase.vout[0].nValue += spend.tx.vout[spend.n].nValue - 1
coinbase.rehash()
block = create_block(base_block_hash, coinbase, block_time)
# Make sure we have plenty engough to spend going forward.
spendable_outputs = deque([spend])
def get_base_transaction():
# Create the new transaction
tx = CTransaction()
# Spend from one of the spendable outputs
spend = spendable_outputs.popleft()
tx.vin.append(CTxIn(COutPoint(spend.tx.sha256, spend.n)))
# Add spendable outputs
for i in range(4):
tx.vout.append(CTxOut(0, CScript([OP_TRUE])))
spendable_outputs.append(PreviousSpendableOutput(tx, i))
return tx
tx = get_base_transaction()
# Make it the same format as transaction added for padding and save the size.
# It's missing the padding output, so we add a constant to account for it.
tx.rehash()
base_tx_size = len(tx.serialize()) + 18
# If a specific script is required, add it.
if script != None:
tx.vout.append(CTxOut(1, script))
# Put some random data into the first transaction of the chain to randomize ids.
tx.vout.append(
CTxOut(0, CScript([random.randint(0, 256), OP_RETURN])))
# Add the transaction to the block
self.add_transactions_to_block(block, [tx])
# If we have a block size requirement, just fill
# the block until we get there
current_block_size = len(block.serialize())
while current_block_size < block_size:
# We will add a new transaction. That means the size of
# the field enumerating how many transaction go in the block
# may change.
current_block_size -= len(ser_compact_size(len(block.vtx)))
current_block_size += len(ser_compact_size(len(block.vtx) + 1))
# Create the new transaction
tx = get_base_transaction()
# Add padding to fill the block.
script_length = block_size - current_block_size - base_tx_size
if script_length > 510000:
if script_length < 1000000:
# Make sure we don't find ourselves in a position where we
# need to generate a transaction smaller than what we expected.
script_length = script_length // 2
else:
script_length = 500000
tx_sigops = min(extra_sigops, script_length,
MAX_TX_SIGOPS_COUNT)
extra_sigops -= tx_sigops
script_pad_len = script_length - tx_sigops
script_output = CScript(
[b'\x00' * script_pad_len] + [OP_CHECKSIG] * tx_sigops)
tx.vout.append(CTxOut(0, script_output))
# Add the tx to the list of transactions to be included
# in the block.
self.add_transactions_to_block(block, [tx])
current_block_size += len(tx.serialize())
# Now that we added a bunch of transaction, we need to recompute
# the merkle root.
block.hashMerkleRoot = block.calc_merkle_root()
# Check that the block size is what's expected
if block_size > 0:
assert_equal(len(block.serialize()), block_size)
# Do PoW, which is cheap on regnet
block.solve()
self.tip = block
self.block_heights[block.sha256] = height
assert number not in self.blocks
self.blocks[number] = block
return block
def get_tests(self):
- self.genesis_hash = int(self.nodes[0].getbestblockhash(), 16)
+ node = self.nodes[0]
+ self.genesis_hash = int(node.getbestblockhash(), 16)
self.block_heights[self.genesis_hash] = 0
spendable_outputs = []
# save the current tip so it can be spent by a later block
def save_spendable_output():
spendable_outputs.append(self.tip)
# get an output that we previously marked as spendable
def get_spendable_output():
return PreviousSpendableOutput(spendable_outputs.pop(0).vtx[0], 0)
# returns a test case that asserts that the current tip was accepted
def accepted():
return TestInstance([[self.tip, True]])
# returns a test case that asserts that the current tip was rejected
def rejected(reject=None):
if reject is None:
return TestInstance([[self.tip, False]])
else:
return TestInstance([[self.tip, reject]])
# move the tip back to a previous block
def tip(number):
self.tip = self.blocks[number]
# adds transactions to the block and updates state
def update_block(block_number, new_transactions):
block = self.blocks[block_number]
self.add_transactions_to_block(block, new_transactions)
old_sha256 = block.sha256
block.hashMerkleRoot = block.calc_merkle_root()
block.solve()
# Update the internal state just like in next_block
self.tip = block
if block.sha256 != old_sha256:
self.block_heights[
block.sha256] = self.block_heights[old_sha256]
del self.block_heights[old_sha256]
self.blocks[block_number] = block
return block
# shorthand for functions
block = self.next_block
# Create a new block
block(0)
save_spendable_output()
yield accepted()
# Now we need that block to mature so we can spend the coinbase.
test = TestInstance(sync_every_block=False)
for i in range(99):
block(5000 + i)
test.blocks_and_transactions.append([self.tip, True])
save_spendable_output()
yield test
# collect spendable outputs now to avoid cluttering the code later on
out = []
for i in range(100):
out.append(get_spendable_output())
# Let's build some blocks and test them.
for i in range(15):
n = i + 1
block(n, spend=out[i], block_size=n * ONE_MEGABYTE // 2)
yield accepted()
- # Fork block
+ # Start moving MTP forward
bfork = block(5555, out[15], block_size=8 * ONE_MEGABYTE)
- bfork.nTime = MONOLITH_START_TIME
+ bfork.nTime = MONOLITH_START_TIME - 1
update_block(5555, [])
yield accepted()
# Get to one block of the May 15, 2018 HF activation
- for i in range(4):
+ for i in range(5):
block(5100 + i)
test.blocks_and_transactions.append([self.tip, True])
yield test
+ # Check that the MTP is just before the configured fork point.
+ assert_equal(node.getblockheader(node.getbestblockhash())['mediantime'],
+ MONOLITH_START_TIME - 1)
+
# Before we acivate the May 15, 2018 HF, 8MB is the limit.
block(4444, spend=out[16], block_size=8 * ONE_MEGABYTE + 1)
yield rejected(RejectResult(16, b'bad-blk-length'))
# Rewind bad block.
- tip(5103)
+ tip(5104)
# Actiavte the May 15, 2018 HF
- block(5104)
+ block(5556)
yield accepted()
+ # Now MTP is exactly the fork time. Bigger blocks are now accepted.
+ assert_equal(node.getblockheader(node.getbestblockhash())['mediantime'],
+ MONOLITH_START_TIME)
+
# block of maximal size
block(17, spend=out[16], block_size=self.excessive_block_size)
yield accepted()
# Reject oversized blocks with bad-blk-length error
block(18, spend=out[17], block_size=self.excessive_block_size + 1)
yield rejected(RejectResult(16, b'bad-blk-length'))
# Rewind bad block.
tip(17)
# Accept many sigops
lots_of_checksigs = CScript(
[OP_CHECKSIG] * MAX_BLOCK_SIGOPS_PER_MB)
block(19, spend=out[17], script=lots_of_checksigs,
block_size=ONE_MEGABYTE)
yield accepted()
block(20, spend=out[18], script=lots_of_checksigs,
block_size=ONE_MEGABYTE, extra_sigops=1)
yield rejected(RejectResult(16, b'bad-blk-sigops'))
# Rewind bad block
tip(19)
# Accept 40k sigops per block > 1MB and <= 2MB
block(21, spend=out[18], script=lots_of_checksigs,
extra_sigops=MAX_BLOCK_SIGOPS_PER_MB, block_size=ONE_MEGABYTE + 1)
yield accepted()
# Accept 40k sigops per block > 1MB and <= 2MB
block(22, spend=out[19], script=lots_of_checksigs,
extra_sigops=MAX_BLOCK_SIGOPS_PER_MB, block_size=2 * ONE_MEGABYTE)
yield accepted()
# Reject more than 40k sigops per block > 1MB and <= 2MB.
block(23, spend=out[20], script=lots_of_checksigs,
extra_sigops=MAX_BLOCK_SIGOPS_PER_MB + 1, block_size=ONE_MEGABYTE + 1)
yield rejected(RejectResult(16, b'bad-blk-sigops'))
# Rewind bad block
tip(22)
# Reject more than 40k sigops per block > 1MB and <= 2MB.
block(24, spend=out[20], script=lots_of_checksigs,
extra_sigops=MAX_BLOCK_SIGOPS_PER_MB + 1, block_size=2 * ONE_MEGABYTE)
yield rejected(RejectResult(16, b'bad-blk-sigops'))
# Rewind bad block
tip(22)
# Accept 60k sigops per block > 2MB and <= 3MB
block(25, spend=out[20], script=lots_of_checksigs, extra_sigops=2 *
MAX_BLOCK_SIGOPS_PER_MB, block_size=2 * ONE_MEGABYTE + 1)
yield accepted()
# Accept 60k sigops per block > 2MB and <= 3MB
block(26, spend=out[21], script=lots_of_checksigs,
extra_sigops=2 * MAX_BLOCK_SIGOPS_PER_MB, block_size=3 * ONE_MEGABYTE)
yield accepted()
# Reject more than 40k sigops per block > 1MB and <= 2MB.
block(27, spend=out[22], script=lots_of_checksigs, extra_sigops=2 *
MAX_BLOCK_SIGOPS_PER_MB + 1, block_size=2 * ONE_MEGABYTE + 1)
yield rejected(RejectResult(16, b'bad-blk-sigops'))
# Rewind bad block
tip(26)
# Reject more than 40k sigops per block > 1MB and <= 2MB.
block(28, spend=out[22], script=lots_of_checksigs, extra_sigops=2 *
MAX_BLOCK_SIGOPS_PER_MB + 1, block_size=3 * ONE_MEGABYTE)
yield rejected(RejectResult(16, b'bad-blk-sigops'))
# Rewind bad block
tip(26)
# Too many sigops in one txn
too_many_tx_checksigs = CScript(
[OP_CHECKSIG] * (MAX_BLOCK_SIGOPS_PER_MB + 1))
block(
29, spend=out[22], script=too_many_tx_checksigs, block_size=ONE_MEGABYTE + 1)
yield rejected(RejectResult(16, b'bad-txn-sigops'))
# Rewind bad block
tip(26)
# Generate a key pair to test P2SH sigops count
private_key = CECKey()
private_key.set_secretbytes(b"fatstacks")
public_key = private_key.get_pubkey()
# P2SH
# Build the redeem script, hash it, use hash to create the p2sh script
redeem_script = CScript(
[public_key] + [OP_2DUP, OP_CHECKSIGVERIFY] * 5 + [OP_CHECKSIG])
redeem_script_hash = hash160(redeem_script)
p2sh_script = CScript([OP_HASH160, redeem_script_hash, OP_EQUAL])
# Create a p2sh transaction
p2sh_tx = self.create_tx(out[22].tx, out[22].n, 1, p2sh_script)
# Add the transaction to the block
block(30)
update_block(30, [p2sh_tx])
yield accepted()
# Creates a new transaction using the p2sh transaction included in the
# last block
def spend_p2sh_tx(output_script=CScript([OP_TRUE])):
# Create the transaction
spent_p2sh_tx = CTransaction()
spent_p2sh_tx.vin.append(CTxIn(COutPoint(p2sh_tx.sha256, 0), b''))
spent_p2sh_tx.vout.append(CTxOut(1, output_script))
# Sign the transaction using the redeem script
sighash = SignatureHashForkId(
redeem_script, spent_p2sh_tx, 0, SIGHASH_ALL | SIGHASH_FORKID, p2sh_tx.vout[0].nValue)
sig = private_key.sign(sighash) + \
bytes(bytearray([SIGHASH_ALL | SIGHASH_FORKID]))
spent_p2sh_tx.vin[0].scriptSig = CScript([sig, redeem_script])
spent_p2sh_tx.rehash()
return spent_p2sh_tx
# Sigops p2sh limit
p2sh_sigops_limit = MAX_BLOCK_SIGOPS_PER_MB - \
redeem_script.GetSigOpCount(True)
# Too many sigops in one p2sh txn
too_many_p2sh_sigops = CScript([OP_CHECKSIG] * (p2sh_sigops_limit + 1))
block(31, spend=out[23], block_size=ONE_MEGABYTE + 1)
update_block(31, [spend_p2sh_tx(too_many_p2sh_sigops)])
yield rejected(RejectResult(16, b'bad-txn-sigops'))
# Rewind bad block
tip(30)
# Max sigops in one p2sh txn
max_p2sh_sigops = CScript([OP_CHECKSIG] * (p2sh_sigops_limit))
block(32, spend=out[23], block_size=ONE_MEGABYTE + 1)
update_block(32, [spend_p2sh_tx(max_p2sh_sigops)])
yield accepted()
if __name__ == '__main__':
FullBlockTest().main()