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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2018 The Bitcoin Core developers
// Copyright (c) 2017-2020 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 <avalanche/processor.h>
#include <blockdb.h>
#include <blockvalidity.h>
#include <chainparams.h>
#include <checkpoints.h>
#include <checkqueue.h>
#include <config.h>
#include <consensus/activation.h>
#include <consensus/merkle.h>
#include <consensus/tx_check.h>
#include <consensus/tx_verify.h>
#include <consensus/validation.h>
#include <hash.h>
#include <index/txindex.h>
#include <logging.h>
#include <logging/timer.h>
#include <minerfund.h>
#include <node/ui_interface.h>
#include <policy/fees.h>
#include <policy/mempool.h>
#include <policy/policy.h>
#include <policy/settings.h>
#include <pow/aserti32d.h> // For ResetASERTAnchorBlockCache
#include <pow/pow.h>
#include <primitives/block.h>
#include <primitives/transaction.h>
#include <random.h>
#include <reverse_iterator.h>
#include <script/script.h>
#include <script/scriptcache.h>
#include <script/sigcache.h>
#include <shutdown.h>
#include <timedata.h>
#include <tinyformat.h>
#include <txdb.h>
#include <txmempool.h>
#include <undo.h>
#include <util/check.h> // For NDEBUG compile time check
#include <util/moneystr.h>
#include <util/strencodings.h>
#include <util/system.h>
#include <util/translation.h>
#include <validationinterface.h>
#include <warnings.h>
#include <boost/algorithm/string/replace.hpp>
#include <optional>
#include <string>
#include <thread>
#define MICRO 0.000001
#define MILLI 0.001
/** Time to wait between writing blocks/block index to disk. */
static constexpr std::chrono::hours DATABASE_WRITE_INTERVAL{1};
/** Time to wait between flushing chainstate to disk. */
static constexpr std::chrono::hours DATABASE_FLUSH_INTERVAL{24};
ChainstateManager g_chainman;
CChainState &ChainstateActive() {
LOCK(::cs_main);
assert(g_chainman.m_active_chainstate);
return *g_chainman.m_active_chainstate;
}
CChain &ChainActive() {
LOCK(::cs_main);
return ::ChainstateActive().m_chain;
}
/**
* Global state
*
* Mutex to guard access to validation specific variables, such as reading
* or changing the chainstate.
*
* This may also need to be locked when updating the transaction pool, e.g. on
* AcceptToMemoryPool. See CTxMemPool::cs comment for details.
*
* The transaction pool has a separate lock to allow reading from it and the
* chainstate at the same time.
*/
RecursiveMutex cs_main;
CBlockIndex *pindexBestHeader = nullptr;
Mutex g_best_block_mutex;
std::condition_variable g_best_block_cv;
uint256 g_best_block;
std::atomic_bool fImporting(false);
std::atomic_bool fReindex(false);
bool fHavePruned = false;
bool fPruneMode = false;
bool fRequireStandard = true;
bool fCheckBlockIndex = false;
bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED;
uint64_t nPruneTarget = 0;
int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE;
BlockHash hashAssumeValid;
arith_uint256 nMinimumChainWork;
CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE_PER_KB);
CTxMemPool g_mempool;
// Internal stuff
namespace {
CBlockIndex *pindexBestInvalid = nullptr;
CBlockIndex *pindexBestParked = nullptr;
RecursiveMutex cs_LastBlockFile;
std::vector<CBlockFileInfo> 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;
/** Dirty block index entries. */
std::set<const CBlockIndex *> setDirtyBlockIndex;
/** Dirty block file entries. */
std::set<int> setDirtyFileInfo;
} // namespace
BlockValidationOptions::BlockValidationOptions(const Config &config)
: excessiveBlockSize(config.GetMaxBlockSize()), checkPoW(true),
checkMerkleRoot(true) {}
CBlockIndex *LookupBlockIndex(const BlockHash &hash) {
AssertLockHeld(cs_main);
BlockMap::const_iterator it = g_chainman.BlockIndex().find(hash);
return it == g_chainman.BlockIndex().end() ? nullptr : it->second;
}
CBlockIndex *FindForkInGlobalIndex(const CChain &chain,
const CBlockLocator &locator) {
AssertLockHeld(cs_main);
// Find the latest block common to locator and chain - we expect that
// locator.vHave is sorted descending by height.
for (const BlockHash &hash : locator.vHave) {
CBlockIndex *pindex = LookupBlockIndex(hash);
if (pindex) {
if (chain.Contains(pindex)) {
return pindex;
}
if (pindex->GetAncestor(chain.Height()) == chain.Tip()) {
return chain.Tip();
}
}
}
return chain.Genesis();
}
std::unique_ptr<CBlockTreeDB> pblocktree;
// See definition for documentation
static void FindFilesToPruneManual(ChainstateManager &chainman,
std::set<int> &setFilesToPrune,
int nManualPruneHeight);
static void FindFilesToPrune(ChainstateManager &chainman,
std::set<int> &setFilesToPrune,
uint64_t nPruneAfterHeight);
static uint32_t GetNextBlockScriptFlags(const Consensus::Params &params,
const CBlockIndex *pindex);
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 CTxMemPool &pool, const CTransaction &tx,
int flags, LockPoints *lp, bool useExistingLockPoints) {
AssertLockHeld(cs_main);
AssertLockHeld(pool.cs);
CBlockIndex *tip = ::ChainActive().Tip();
assert(tip != nullptr);
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<int, int64_t> lockPair;
if (useExistingLockPoints) {
assert(lp);
lockPair.first = lp->height;
lockPair.second = lp->time;
} else {
// CoinsTip() contains the UTXO set for ::ChainActive().Tip()
CCoinsViewMemPool viewMemPool(&::ChainstateActive().CoinsTip(), pool);
std::vector<int> 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 (const 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);
}
// Command-line argument "-replayprotectionactivationtime=<timestamp>" will
// cause the node to switch to replay protected SigHash ForkID value when the
// median timestamp of the previous 11 blocks is greater than or equal to
// <timestamp>. Defaults to the pre-defined timestamp when not set.
static bool IsReplayProtectionEnabled(const Consensus::Params &params,
int64_t nMedianTimePast) {
return nMedianTimePast >= gArgs.GetArg("-replayprotectionactivationtime",
params.tachyonActivationTime);
}
static bool IsReplayProtectionEnabled(const Consensus::Params &params,
const CBlockIndex *pindexPrev) {
if (pindexPrev == nullptr) {
return false;
}
return IsReplayProtectionEnabled(params, pindexPrev->GetMedianTimePast());
}
// Used to avoid mempool polluting consensus critical paths if CCoinsViewMempool
// were somehow broken and returning the wrong scriptPubKeys
static bool CheckInputsFromMempoolAndCache(
const CTransaction &tx, TxValidationState &state,
const CCoinsViewCache &view, const CTxMemPool &pool, const uint32_t flags,
PrecomputedTransactionData &txdata, int &nSigChecksOut)
EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
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 CheckInputScripts
LOCK(pool.cs);
assert(!tx.IsCoinBase());
for (const CTxIn &txin : tx.vin) {
const Coin &coin = view.AccessCoin(txin.prevout);
// AcceptToMemoryPoolWorker has already checked that the coins are
// available, so this shouldn't fail. If the inputs are not available
// here then return false.
if (coin.IsSpent()) {
return false;
}
// Check equivalence for available inputs.
const CTransactionRef &txFrom = pool.get(txin.prevout.GetTxId());
if (txFrom) {
assert(txFrom->GetId() == txin.prevout.GetTxId());
assert(txFrom->vout.size() > txin.prevout.GetN());
assert(txFrom->vout[txin.prevout.GetN()] == coin.GetTxOut());
} else {
const Coin &coinFromDisk =
::ChainstateActive().CoinsTip().AccessCoin(txin.prevout);
assert(!coinFromDisk.IsSpent());
assert(coinFromDisk.GetTxOut() == coin.GetTxOut());
}
}
// Call CheckInputScripts() to cache signature and script validity against
// current tip consensus rules.
return CheckInputScripts(tx, state, view, flags, /* cacheSigStore = */ true,
/* cacheFullScriptStore = */ true, txdata,
nSigChecksOut);
}
namespace {
class MemPoolAccept {
public:
MemPoolAccept(CTxMemPool &mempool)
: m_pool(mempool), m_view(&m_dummy),
m_viewmempool(&::ChainstateActive().CoinsTip(), m_pool),
m_limit_ancestors(
gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT)),
m_limit_ancestor_size(
gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT) *
1000),
m_limit_descendants(
gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT)),
m_limit_descendant_size(gArgs.GetArg("-limitdescendantsize",
DEFAULT_DESCENDANT_SIZE_LIMIT) *
1000) {}
// We put the arguments we're handed into a struct, so we can pass them
// around easier.
struct ATMPArgs {
const Config &m_config;
TxValidationState &m_state;
const int64_t m_accept_time;
const bool m_bypass_limits;
const Amount &m_absurd_fee;
/*
* Return any outpoints which were not previously present in the coins
* cache, but were added as a result of validating the tx for mempool
* acceptance. This allows the caller to optionally remove the cache
* additions if the associated transaction ends up being rejected by
* the mempool.
*/
std::vector<COutPoint> &m_coins_to_uncache;
const bool m_test_accept;
};
// Single transaction acceptance
bool AcceptSingleTransaction(const CTransactionRef &ptx, ATMPArgs &args)
EXCLUSIVE_LOCKS_REQUIRED(cs_main);
private:
// All the intermediate state that gets passed between the various levels
// of checking a given transaction.
struct Workspace {
Workspace(const CTransactionRef &ptx,
const uint32_t next_block_script_verify_flags)
: m_ptx(ptx),
m_next_block_script_verify_flags(next_block_script_verify_flags) {
}
CTxMemPool::setEntries m_ancestors;
std::unique_ptr<CTxMemPoolEntry> m_entry;
Amount m_modified_fees;
const CTransactionRef &m_ptx;
// ABC specific flags that are used in both PreChecks and
// ConsensusScriptChecks
const uint32_t m_next_block_script_verify_flags;
int m_sig_checks_standard;
};
// Run the policy checks on a given transaction, excluding any script
// checks. Looks up inputs, calculates feerate, considers replacement,
// evaluates package limits, etc. As this function can be invoked for "free"
// by a peer, only tests that are fast should be done here (to avoid CPU
// DoS).
bool PreChecks(ATMPArgs &args, Workspace &ws)
EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
// Re-run the script checks, using consensus flags, and try to cache the
// result in the scriptcache. This should be done after
// PolicyScriptChecks(). This requires that all inputs either be in our
// utxo set or in the mempool.
bool ConsensusScriptChecks(ATMPArgs &args, Workspace &ws,
PrecomputedTransactionData &txdata)
EXCLUSIVE_LOCKS_REQUIRED(cs_main);
// Try to add the transaction to the mempool, removing any conflicts first.
// Returns true if the transaction is in the mempool after any size
// limiting is performed, false otherwise.
bool Finalize(ATMPArgs &args, Workspace &ws)
EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
private:
CTxMemPool &m_pool;
CCoinsViewCache m_view;
CCoinsViewMemPool m_viewmempool;
CCoinsView m_dummy;
// The package limits in effect at the time of invocation.
const size_t m_limit_ancestors;
const size_t m_limit_ancestor_size;
// These may be modified while evaluating a transaction (eg to account for
// in-mempool conflicts; see below).
size_t m_limit_descendants;
size_t m_limit_descendant_size;
};
bool MemPoolAccept::PreChecks(ATMPArgs &args, Workspace &ws) {
const CTransactionRef &ptx = ws.m_ptx;
const CTransaction &tx = *ws.m_ptx;
const TxId &txid = ws.m_ptx->GetId();
// Copy/alias what we need out of args
TxValidationState &state = args.m_state;
const int64_t nAcceptTime = args.m_accept_time;
const bool bypass_limits = args.m_bypass_limits;
const Amount &nAbsurdFee = args.m_absurd_fee;
std::vector<COutPoint> &coins_to_uncache = args.m_coins_to_uncache;
// Alias what we need out of ws
CTxMemPool::setEntries &setAncestors = ws.m_ancestors;
std::unique_ptr<CTxMemPoolEntry> &entry = ws.m_entry;
Amount &nModifiedFees = ws.m_modified_fees;
// Coinbase is only valid in a block, not as a loose transaction.
if (!CheckRegularTransaction(tx, state)) {
// state filled in by CheckRegularTransaction.
return false;
}
// Rather not work on nonstandard transactions (unless -testnet)
std::string reason;
if (fRequireStandard && !IsStandardTx(tx, reason)) {
return state.Invalid(TxValidationResult::TX_NOT_STANDARD, 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.
TxValidationState ctxState;
if (!ContextualCheckTransactionForCurrentBlock(
args.m_config.GetChainParams().GetConsensus(), 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.Invalid(TxValidationResult::TX_PREMATURE_SPEND,
ctxState.GetRejectReason(),
ctxState.GetDebugMessage());
}
// Is it already in the memory pool?
if (m_pool.exists(txid)) {
return state.Invalid(TxValidationResult::TX_CONFLICT,
"txn-already-in-mempool");
}
// Check for conflicts with in-memory transactions
for (const CTxIn &txin : tx.vin) {
auto itConflicting = m_pool.mapNextTx.find(txin.prevout);
if (itConflicting != m_pool.mapNextTx.end()) {
// Disable replacement feature for good
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY,
"txn-mempool-conflict");
}
}
LockPoints lp;
m_view.SetBackend(m_viewmempool);
CCoinsViewCache &coins_cache = ::ChainstateActive().CoinsTip();
// Do all inputs exist?
for (const CTxIn &txin : tx.vin) {
if (!coins_cache.HaveCoinInCache(txin.prevout)) {
coins_to_uncache.push_back(txin.prevout);
}
// Note: this call may add txin.prevout to the coins cache
// (coins_cache.cacheCoins) by way of FetchCoin(). It should be
// removed later (via coins_to_uncache) if this tx turns out to be
// invalid.
if (!m_view.HaveCoin(txin.prevout)) {
// Are inputs missing because we already have the tx?
for (size_t out = 0; out < tx.vout.size(); out++) {
// Optimistically just do efficient check of cache for
// outputs.
if (coins_cache.HaveCoinInCache(COutPoint(txid, out))) {
return state.Invalid(TxValidationResult::TX_CONFLICT,
"txn-already-known");
}
}
// Otherwise assume this might be an orphan tx for which we just
// haven't seen parents yet.
return state.Invalid(TxValidationResult::TX_MISSING_INPUTS,
"bad-txns-inputs-missingorspent");
}
}
// Are the actual inputs available?
if (!m_view.HaveInputs(tx)) {
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY,
"bad-txns-inputs-spent");
}
// Bring the best block into scope.
m_view.GetBestBlock();
// we have all inputs cached now, so switch back to dummy (to protect
// against bugs where we pull more inputs from disk that miss being
// added to coins_to_uncache)
m_view.SetBackend(m_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(m_pool, tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp)) {
return state.Invalid(TxValidationResult::TX_PREMATURE_SPEND,
"non-BIP68-final");
}
Amount nFees = Amount::zero();
if (!Consensus::CheckTxInputs(tx, state, m_view, GetSpendHeight(m_view),
nFees)) {
return error("%s: Consensus::CheckTxInputs: %s, %s", __func__,
tx.GetId().ToString(), state.ToString());
}
// Check for non-standard pay-to-script-hash in inputs
if (fRequireStandard &&
!AreInputsStandard(tx, m_view, ws.m_next_block_script_verify_flags)) {
return state.Invalid(TxValidationResult::TX_NOT_STANDARD,
"bad-txns-nonstandard-inputs");
}
// nModifiedFees includes any fee deltas from PrioritiseTransaction
nModifiedFees = nFees;
m_pool.ApplyDelta(txid, nModifiedFees);
// 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 = m_view.AccessCoin(txin.prevout);
if (coin.IsCoinBase()) {
fSpendsCoinbase = true;
break;
}
}
unsigned int nSize = tx.GetTotalSize();
// No transactions are allowed below minRelayTxFee except from disconnected
// blocks.
// Do not change this to use virtualsize without coordinating a network
// policy upgrade.
if (!bypass_limits && nModifiedFees < minRelayTxFee.GetFee(nSize)) {
return state.Invalid(
TxValidationResult::TX_MEMPOOL_POLICY, "min relay fee not met",
strprintf("%d < %d", nModifiedFees, ::minRelayTxFee.GetFee(nSize)));
}
if (nAbsurdFee != Amount::zero() && nFees > nAbsurdFee) {
return state.Invalid(TxValidationResult::TX_NOT_STANDARD,
"absurdly-high-fee",
strprintf("%d > %d", nFees, nAbsurdFee));
}
// Validate input scripts against standard script flags.
const uint32_t scriptVerifyFlags =
ws.m_next_block_script_verify_flags | STANDARD_SCRIPT_VERIFY_FLAGS;
PrecomputedTransactionData txdata(tx);
if (!CheckInputScripts(tx, state, m_view, scriptVerifyFlags, true, false,
txdata, ws.m_sig_checks_standard)) {
// State filled in by CheckInputScripts
return false;
}
entry.reset(new CTxMemPoolEntry(ptx, nFees, nAcceptTime,
::ChainActive().Height(), fSpendsCoinbase,
ws.m_sig_checks_standard, lp));
unsigned int nVirtualSize = entry->GetTxVirtualSize();
Amount mempoolRejectFee =
m_pool
.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) *
1000000)
.GetFee(nVirtualSize);
if (!bypass_limits && mempoolRejectFee > Amount::zero() &&
nModifiedFees < mempoolRejectFee) {
return state.Invalid(
TxValidationResult::TX_MEMPOOL_POLICY, "mempool min fee not met",
strprintf("%d < %d", nModifiedFees, mempoolRejectFee));
}
// Calculate in-mempool ancestors, up to a limit.
std::string errString;
if (!m_pool.CalculateMemPoolAncestors(
*entry, setAncestors, m_limit_ancestors, m_limit_ancestor_size,
m_limit_descendants, m_limit_descendant_size, errString)) {
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY,
"too-long-mempool-chain", errString);
}
return true;
}
bool MemPoolAccept::ConsensusScriptChecks(ATMPArgs &args, Workspace &ws,
PrecomputedTransactionData &txdata) {
const CTransaction &tx = *ws.m_ptx;
const TxId &txid = tx.GetId();
TxValidationState &state = args.m_state;
// Check again against the next block's script verification flags
// to cache our script execution flags.
//
// 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.
int nSigChecksConsensus;
if (!CheckInputsFromMempoolAndCache(tx, state, m_view, m_pool,
ws.m_next_block_script_verify_flags,
txdata, nSigChecksConsensus)) {
// This can occur under some circumstances, if the node receives an
// unrequested tx which is invalid due to new consensus rules not
// being activated yet (during IBD).
return error("%s: BUG! PLEASE REPORT THIS! CheckInputScripts failed "
"against next-block but not STANDARD flags %s, %s",
__func__, txid.ToString(), state.ToString());
}
if (ws.m_sig_checks_standard != nSigChecksConsensus) {
// We can't accept this transaction as we've used the standard count
// for the mempool/mining, but the consensus count will be enforced
// in validation (we don't want to produce bad block templates).
return error(
"%s: BUG! PLEASE REPORT THIS! SigChecks count differed between "
"standard and consensus flags in %s",
__func__, txid.ToString());
}
return true;
}
bool MemPoolAccept::Finalize(ATMPArgs &args, Workspace &ws) {
const TxId &txid = ws.m_ptx->GetId();
TxValidationState &state = args.m_state;
const bool bypass_limits = args.m_bypass_limits;
CTxMemPool::setEntries &setAncestors = ws.m_ancestors;
std::unique_ptr<CTxMemPoolEntry> &entry = ws.m_entry;
// Store transaction in memory.
m_pool.addUnchecked(*entry, setAncestors);
// Trim mempool and check if tx was trimmed.
if (!bypass_limits) {
m_pool.LimitSize(
gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000,
std::chrono::hours{
gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY)});
if (!m_pool.exists(txid)) {
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY,
"mempool full");
}
}
return true;
}
bool MemPoolAccept::AcceptSingleTransaction(const CTransactionRef &ptx,
ATMPArgs &args) {
AssertLockHeld(cs_main);
// mempool "read lock" (held through
// GetMainSignals().TransactionAddedToMempool())
LOCK(m_pool.cs);
Workspace workspace(ptx, GetNextBlockScriptFlags(
args.m_config.GetChainParams().GetConsensus(),
::ChainActive().Tip()));
if (!PreChecks(args, workspace)) {
return false;
}
// Only compute the precomputed transaction data if we need to verify
// scripts (ie, other policy checks pass). We perform the inexpensive
// checks first and avoid hashing and signature verification unless those
// checks pass, to mitigate CPU exhaustion denial-of-service attacks.
PrecomputedTransactionData txdata(*ptx);
if (!ConsensusScriptChecks(args, workspace, txdata)) {
return false;
}
// Tx was accepted, but not added
if (args.m_test_accept) {
return true;
}
if (!Finalize(args, workspace)) {
return false;
}
GetMainSignals().TransactionAddedToMempool(ptx);
return true;
}
} // namespace
/**
* (try to) add transaction to memory pool with a specified acceptance time.
*/
static bool
AcceptToMemoryPoolWithTime(const Config &config, CTxMemPool &pool,
TxValidationState &state, const CTransactionRef &tx,
int64_t nAcceptTime, bool bypass_limits,
const Amount nAbsurdFee, bool test_accept)
EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
AssertLockHeld(cs_main);
std::vector<COutPoint> coins_to_uncache;
MemPoolAccept::ATMPArgs args{config, state, nAcceptTime,
bypass_limits, nAbsurdFee, coins_to_uncache,
test_accept};
bool res = MemPoolAccept(pool).AcceptSingleTransaction(tx, args);
if (!res) {
// Remove coins that were not present in the coins cache before calling
// ATMPW; this is to prevent memory DoS in case we receive a large
// number of invalid transactions that attempt to overrun the in-memory
// coins cache
// (`CCoinsViewCache::cacheCoins`).
for (const COutPoint &outpoint : coins_to_uncache) {
::ChainstateActive().CoinsTip().Uncache(outpoint);
}
}
// After we've (potentially) uncached entries, ensure our coins cache is
// still within its size limits
BlockValidationState stateDummy;
::ChainstateActive().FlushStateToDisk(config.GetChainParams(), stateDummy,
FlushStateMode::PERIODIC);
return res;
}
bool AcceptToMemoryPool(const Config &config, CTxMemPool &pool,
TxValidationState &state, const CTransactionRef &tx,
bool bypass_limits, const Amount nAbsurdFee,
bool test_accept) {
return AcceptToMemoryPoolWithTime(config, pool, state, tx, GetTime(),
bypass_limits, nAbsurdFee, test_accept);
}
/**
* Return transaction in txOut, and if it was found inside a block, its hash is
* placed in hashBlock. If blockIndex is provided, the transaction is fetched
* from the corresponding block.
*/
bool GetTransaction(const TxId &txid, CTransactionRef &txOut,
const Consensus::Params &params, BlockHash &hashBlock,
const CBlockIndex *const block_index) {
LOCK(cs_main);
if (block_index == nullptr) {
CTransactionRef ptx = g_mempool.get(txid);
if (ptx) {
txOut = ptx;
return true;
}
if (g_txindex) {
return g_txindex->FindTx(txid, hashBlock, txOut);
}
} else {
CBlock block;
if (ReadBlockFromDisk(block, block_index, params)) {
for (const auto &tx : block.vtx) {
if (tx->GetId() == txid) {
txOut = tx;
hashBlock = block_index->GetBlockHash();
return true;
}
}
}
}
return false;
}
//////////////////////////////////////////////////////////////////////////////
//
// CBlock and CBlockIndex
//
static bool WriteBlockToDisk(const CBlock &block, FlatFilePos &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(block, fileout.GetVersion());
fileout << 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;
}
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::zero();
}
Amount nSubsidy = 50 * COIN;
// Subsidy is cut in half every 210,000 blocks which will occur
// approximately every 4 years.
return ((nSubsidy / SATOSHI) >> halvings) * SATOSHI;
}
CoinsViews::CoinsViews(std::string ldb_name, size_t cache_size_bytes,
bool in_memory, bool should_wipe)
: m_dbview(GetDataDir() / ldb_name, cache_size_bytes, in_memory,
should_wipe),
m_catcherview(&m_dbview) {}
void CoinsViews::InitCache() {
m_cacheview = std::make_unique<CCoinsViewCache>(&m_catcherview);
}
CChainState::CChainState(BlockManager &blockman,
BlockHash from_snapshot_blockhash)
: m_blockman(blockman), m_from_snapshot_blockhash(from_snapshot_blockhash) {
}
void CChainState::InitCoinsDB(size_t cache_size_bytes, bool in_memory,
bool should_wipe, std::string leveldb_name) {
if (!m_from_snapshot_blockhash.IsNull()) {
leveldb_name += "_" + m_from_snapshot_blockhash.ToString();
}
m_coins_views = std::make_unique<CoinsViews>(leveldb_name, cache_size_bytes,
in_memory, should_wipe);
}
void CChainState::InitCoinsCache(size_t cache_size_bytes) {
assert(m_coins_views != nullptr);
m_coinstip_cache_size_bytes = cache_size_bytes;
m_coins_views->InitCache();
}
// Note that though this is marked const, we may end up modifying
// `m_cached_finished_ibd`, which is a performance-related implementation
// detail. This function must be marked `const` so that `CValidationInterface`
// clients (which are given a `const CChainState*`) can call it.
//
bool CChainState::IsInitialBlockDownload() const {
// Optimization: pre-test latch before taking the lock.
if (m_cached_finished_ibd.load(std::memory_order_relaxed)) {
return false;
}
LOCK(cs_main);
if (m_cached_finished_ibd.load(std::memory_order_relaxed)) {
return false;
}
if (fImporting || fReindex) {
return true;
}
if (m_chain.Tip() == nullptr) {
return true;
}
if (m_chain.Tip()->nChainWork < nMinimumChainWork) {
return true;
}
if (m_chain.Tip()->GetBlockTime() < (GetTime() - nMaxTipAge)) {
return true;
}
LogPrintf("Leaving InitialBlockDownload (latching to false)\n");
m_cached_finished_ibd.store(true, std::memory_order_relaxed);
return false;
}
static CBlockIndex const *pindexBestForkTip = nullptr;
static CBlockIndex const *pindexBestForkBase = nullptr;
BlockMap &BlockIndex() {
LOCK(::cs_main);
return g_chainman.m_blockman.m_block_index;
}
static void AlertNotify(const std::string &strMessage) {
uiInterface.NotifyAlertChanged();
#if defined(HAVE_SYSTEM)
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);
std::thread t(runCommand, strCmd);
// thread runs free
t.detach();
#endif
}
static void CheckForkWarningConditions() EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
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 (::ChainstateActive().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 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)
EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
AssertLockHeld(cs_main);
// If we are on a fork that is sufficiently large, set a warning flag.
const CBlockIndex *pfork = ::ChainActive().FindFork(pindexNewForkTip);
// 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 ||
pindexNewForkTip->nHeight > pindexBestForkTip->nHeight) &&
pindexNewForkTip->nChainWork - pfork->nChainWork >
(GetBlockProof(*pfork) * 7) &&
::ChainActive().Height() - pindexNewForkTip->nHeight < 72) {
pindexBestForkTip = pindexNewForkTip;
pindexBestForkBase = pfork;
}
CheckForkWarningConditions();
}
// Called both upon regular invalid block discovery *and* InvalidateBlock
void CChainState::InvalidChainFound(CBlockIndex *pindexNew) {
AssertLockHeld(cs_main);
if (!pindexBestInvalid ||
pindexNew->nChainWork > pindexBestInvalid->nChainWork) {
pindexBestInvalid = pindexNew;
}
if (pindexBestHeader != nullptr &&
pindexBestHeader->GetAncestor(pindexNew->nHeight) == pindexNew) {
pindexBestHeader = ::ChainActive().Tip();
}
// If the invalid chain found is supposed to be finalized, we need to move
// back the finalization point.
if (IsBlockFinalized(pindexNew)) {
m_finalizedBlockIndex = pindexNew->pprev;
}
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),
FormatISO8601DateTime(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),
FormatISO8601DateTime(tip->GetBlockTime()));
}
// Same as InvalidChainFound, above, except not called directly from
// InvalidateBlock, which does its own setBlockIndexCandidates management.
void CChainState::InvalidBlockFound(CBlockIndex *pindex,
const BlockValidationState &state) {
if (state.GetResult() != BlockValidationResult::BLOCK_MUTATED) {
pindex->nStatus = pindex->nStatus.withFailed();
m_blockman.m_failed_blocks.insert(pindex);
setDirtyBlockIndex.insert(pindex);
InvalidChainFound(pindex);
}
}
void SpendCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo,
int nHeight) {
// Mark inputs spent.
if (tx.IsCoinBase()) {
return;
}
txundo.vprevout.reserve(tx.vin.size());
for (const CTxIn &txin : tx.vin) {
txundo.vprevout.emplace_back();
bool is_spent = view.SpendCoin(txin.prevout, &txundo.vprevout.back());
assert(is_spent);
}
}
void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo,
int nHeight) {
SpendCoins(view, tx, txundo, nHeight);
AddCoins(view, tx, nHeight);
}
void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, int nHeight) {
// Mark inputs spent.
if (!tx.IsCoinBase()) {
for (const CTxIn &txin : tx.vin) {
bool is_spent = view.SpendCoin(txin.prevout);
assert(is_spent);
}
}
// Add outputs.
AddCoins(view, tx, nHeight);
}
bool CScriptCheck::operator()() {
const CScript &scriptSig = ptxTo->vin[nIn].scriptSig;
if (!VerifyScript(scriptSig, m_tx_out.scriptPubKey, nFlags,
CachingTransactionSignatureChecker(
ptxTo, nIn, m_tx_out.nValue, cacheStore, txdata),
metrics, &error)) {
return false;
}
if ((pTxLimitSigChecks &&
!pTxLimitSigChecks->consume_and_check(metrics.nSigChecks)) ||
(pBlockLimitSigChecks &&
!pBlockLimitSigChecks->consume_and_check(metrics.nSigChecks))) {
// we can't assign a meaningful script error (since the script
// succeeded), but remove the ScriptError::OK which could be
// misinterpreted.
error = ScriptError::SIGCHECKS_LIMIT_EXCEEDED;
return false;
}
return true;
}
int GetSpendHeight(const CCoinsViewCache &inputs) {
LOCK(cs_main);
CBlockIndex *pindexPrev = LookupBlockIndex(inputs.GetBestBlock());
return pindexPrev->nHeight + 1;
}
bool CheckInputScripts(const CTransaction &tx, TxValidationState &state,
const CCoinsViewCache &inputs, const uint32_t flags,
bool sigCacheStore, bool scriptCacheStore,
const PrecomputedTransactionData &txdata,
int &nSigChecksOut, TxSigCheckLimiter &txLimitSigChecks,
CheckInputsLimiter *pBlockLimitSigChecks,
std::vector<CScriptCheck> *pvChecks) {
AssertLockHeld(cs_main);
assert(!tx.IsCoinBase());
if (pvChecks) {
pvChecks->reserve(tx.vin.size());
}
// 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).
ScriptCacheKey hashCacheEntry(tx, flags);
if (IsKeyInScriptCache(hashCacheEntry, !scriptCacheStore, nSigChecksOut)) {
if (!txLimitSigChecks.consume_and_check(nSigChecksOut) ||
(pBlockLimitSigChecks &&
!pBlockLimitSigChecks->consume_and_check(nSigChecksOut))) {
return state.Invalid(TxValidationResult::TX_CONSENSUS,
"too-many-sigchecks");
}
return true;
}
int nSigChecksTotal = 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());
// We very carefully only pass in things to CScriptCheck which are
// clearly committed to by tx's 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.
// Verify signature
CScriptCheck check(coin.GetTxOut(), tx, i, flags, sigCacheStore, txdata,
&txLimitSigChecks, pBlockLimitSigChecks);
// If pvChecks is not null, defer the check execution to the caller.
if (pvChecks) {
pvChecks->push_back(std::move(check));
continue;
}
if (!check()) {
ScriptError scriptError = check.GetScriptError();
// Compute flags without the optional standardness flags.
// This differs from MANDATORY_SCRIPT_VERIFY_FLAGS as it contains
// additional upgrade flags (see AcceptToMemoryPoolWorker variable
// extraFlags).
uint32_t mandatoryFlags =
flags & ~STANDARD_NOT_MANDATORY_VERIFY_FLAGS;
if (flags != mandatoryFlags) {
// Check whether the failure was caused by a non-mandatory
// script verification check. If so, ensure we return
// NOT_STANDARD instead of CONSENSUS to avoid downstream users
// splitting the network between upgraded and non-upgraded nodes
// by banning CONSENSUS-failing data providers.
CScriptCheck check2(coin.GetTxOut(), tx, i, mandatoryFlags,
sigCacheStore, txdata);
if (check2()) {
return state.Invalid(
TxValidationResult::TX_NOT_STANDARD,
strprintf("non-mandatory-script-verify-flag (%s)",
ScriptErrorString(scriptError)));
}
// update the error message to reflect the mandatory violation.
scriptError = check2.GetScriptError();
}
// MANDATORY flag failures correspond to
// TxValidationResult::TX_CONSENSUS. Because CONSENSUS failures are
// the most serious case of validation failures, we may need to
// consider using RECENT_CONSENSUS_CHANGE for any script failure
// that could be due to non-upgraded nodes which we may want to
// support, to avoid splitting the network (but this depends on the
// details of how net_processing handles such errors).
return state.Invalid(
TxValidationResult::TX_CONSENSUS,
strprintf("mandatory-script-verify-flag-failed (%s)",
ScriptErrorString(scriptError)));
}
nSigChecksTotal += check.GetScriptExecutionMetrics().nSigChecks;
}
nSigChecksOut = nSigChecksTotal;
if (scriptCacheStore && !pvChecks) {
// We executed all of the provided scripts, and were told to cache the
// result. Do so now.
AddKeyInScriptCache(hashCacheEntry, nSigChecksTotal);
}
return true;
}
static bool UndoWriteToDisk(const CBlockUndo &blockundo, FlatFilePos &pos,
const BlockHash &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(blockundo, fileout.GetVersion());
fileout << 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 CBlockIndex *pindex) {
FlatFilePos pos = pindex->GetUndoPos();
if (pos.IsNull()) {
return error("%s: no undo data available", __func__);
}
// 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<CAutoFile> verifier(&filein);
try {
verifier << pindex->pprev->GetBlockHash();
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 */
static bool AbortNode(const std::string &strMessage,
bilingual_str user_message = bilingual_str()) {
SetMiscWarning(strMessage);
LogPrintf("*** %s\n", strMessage);
if (!user_message.empty()) {
user_message =
_("A fatal internal error occurred, see debug.log for details");
}
AbortError(user_message);
StartShutdown();
return false;
}
static bool AbortNode(BlockValidationState &state,
const std::string &strMessage,
const bilingual_str &userMessage = bilingual_str()) {
AbortNode(strMessage, userMessage);
return state.Error(strMessage);
}
/** 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.GetTxId());
if (alternate.IsSpent()) {
// Adding output for transaction without known metadata
return DisconnectResult::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<Coin &>(undo) = Coin(undo.GetTxOut(), alternate.GetHeight(),
alternate.IsCoinBase());
}
// If the coin already exists as an unspent coin in the cache, then the
// possible_overwrite parameter to AddCoin must be set to true. We have
// already checked whether an unspent coin exists above using HaveCoin, so
// we don't need to guess. When fClean is false, an unspent coin already
// existed and it is an overwrite.
view.AddCoin(out, std::move(undo), !fClean);
return fClean ? DisconnectResult::OK : DisconnectResult::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.
*/
DisconnectResult CChainState::DisconnectBlock(const CBlock &block,
const CBlockIndex *pindex,
CCoinsViewCache &view) {
CBlockUndo blockUndo;
if (!UndoReadFromDisk(blockUndo, pindex)) {
error("DisconnectBlock(): failure reading undo data");
return DisconnectResult::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 DisconnectResult::FAILED;
}
// First, restore inputs.
for (size_t i = 1; i < block.vtx.size(); i++) {
const CTransaction &tx = *(block.vtx[i]);
const CTxUndo &txundo = blockUndo.vtxundo[i - 1];
if (txundo.vprevout.size() != tx.vin.size()) {
error("DisconnectBlock(): transaction and undo data inconsistent");
return DisconnectResult::FAILED;
}
for (size_t j = 0; j < tx.vin.size(); j++) {
const COutPoint &out = tx.vin[j].prevout;
const Coin &undo = txundo.vprevout[j];
DisconnectResult res = UndoCoinSpend(undo, view, out);
if (res == DisconnectResult::FAILED) {
return DisconnectResult::FAILED;
}
fClean = fClean && res != DisconnectResult::UNCLEAN;
}
}
// Second, revert created outputs.
for (const auto &ptx : block.vtx) {
const CTransaction &tx = *ptx;
const TxId &txid = tx.GetId();
const bool is_coinbase = tx.IsCoinBase();
// 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() ||
uint32_t(pindex->nHeight) != coin.GetHeight() ||
is_coinbase != coin.IsCoinBase()) {
// transaction output mismatch
fClean = false;
}
}
}
// Move best block pointer to previous block.
view.SetBestBlock(block.hashPrevBlock);
return fClean ? DisconnectResult::OK : DisconnectResult::UNCLEAN;
}
static void FlushBlockFile(bool fFinalize = false) {
LOCK(cs_LastBlockFile);
FlatFilePos block_pos_old(nLastBlockFile,
vinfoBlockFile[nLastBlockFile].nSize);
FlatFilePos undo_pos_old(nLastBlockFile,
vinfoBlockFile[nLastBlockFile].nUndoSize);
bool status = true;
status &= BlockFileSeq().Flush(block_pos_old, fFinalize);
status &= UndoFileSeq().Flush(undo_pos_old, fFinalize);
if (!status) {
AbortNode("Flushing block file to disk failed. This is likely the "
"result of an I/O error.");
}
}
static bool FindUndoPos(BlockValidationState &state, int nFile,
FlatFilePos &pos, unsigned int nAddSize);
static bool WriteUndoDataForBlock(const CBlockUndo &blockundo,
BlockValidationState &state,
CBlockIndex *pindex,
const CChainParams &chainparams) {
// Write undo information to disk
if (pindex->GetUndoPos().IsNull()) {
FlatFilePos _pos;
if (!FindUndoPos(state, pindex->nFile, _pos,
::GetSerializeSize(blockundo, CLIENT_VERSION) + 40)) {
return error("ConnectBlock(): FindUndoPos failed");
}
if (!UndoWriteToDisk(blockundo, _pos, pindex->pprev->GetBlockHash(),
chainparams.DiskMagic())) {
return AbortNode(state, "Failed to write undo data");
}
// update nUndoPos in block index
pindex->nUndoPos = _pos.nPos;
pindex->nStatus = pindex->nStatus.withUndo();
setDirtyBlockIndex.insert(pindex);
}
return true;
}
static CCheckQueue<CScriptCheck> scriptcheckqueue(128);
void ThreadScriptCheck(int worker_num) {
util::ThreadRename(strprintf("scriptch.%i", worker_num));
scriptcheckqueue.Thread();
}
VersionBitsCache versionbitscache GUARDED_BY(cs_main);
int32_t ComputeBlockVersion(const CBlockIndex *pindexPrev,
const Consensus::Params &params) {
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, static_cast<Consensus::DeploymentPos>(i),
versionbitscache);
if (state == ThresholdState::LOCKED_IN ||
state == ThresholdState::STARTED) {
nVersion |= VersionBitsMask(
params, static_cast<Consensus::DeploymentPos>(i));
}
}
// Clear the last 4 bits (miner fund activation).
return nVersion & ~uint32_t(0x0f);
}
// Returns the script flags which should be checked for the block after
// the given block.
static uint32_t GetNextBlockScriptFlags(const Consensus::Params &params,
const CBlockIndex *pindex) {
uint32_t flags = SCRIPT_VERIFY_NONE;
// Start enforcing P2SH (BIP16)
if ((pindex->nHeight + 1) >= params.BIP16Height) {
flags |= SCRIPT_VERIFY_P2SH;
}
// Start enforcing the DERSIG (BIP66) rule.
if ((pindex->nHeight + 1) >= params.BIP66Height) {
flags |= SCRIPT_VERIFY_DERSIG;
}
// Start enforcing CHECKLOCKTIMEVERIFY (BIP65) rule.
if ((pindex->nHeight + 1) >= params.BIP65Height) {
flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
}
// Start enforcing CSV (BIP68, BIP112 and BIP113) rule.
if ((pindex->nHeight + 1) >= params.CSVHeight) {
flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
}
// If the UAHF is enabled, we start accepting replay protected txns
if (IsUAHFenabled(params, pindex)) {
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(params, pindex)) {
flags |= SCRIPT_VERIFY_LOW_S;
flags |= SCRIPT_VERIFY_NULLFAIL;
}
// When the magnetic anomaly fork is enabled, we start accepting
// transactions using the OP_CHECKDATASIG opcode and it's verify
// alternative. We also start enforcing push only signatures and
// clean stack.
if (IsMagneticAnomalyEnabled(params, pindex)) {
flags |= SCRIPT_VERIFY_CHECKDATASIG_SIGOPS;
flags |= SCRIPT_VERIFY_SIGPUSHONLY;
flags |= SCRIPT_VERIFY_CLEANSTACK;
}
if (IsGravitonEnabled(params, pindex)) {
flags |= SCRIPT_ENABLE_SCHNORR_MULTISIG;
flags |= SCRIPT_VERIFY_MINIMALDATA;
}
if (IsPhononEnabled(params, pindex)) {
flags |= SCRIPT_ENFORCE_SIGCHECKS;
}
// We make sure this node will have replay protection during the next hard
// fork.
if (IsReplayProtectionEnabled(params, pindex)) {
flags |= SCRIPT_ENABLE_REPLAY_PROTECTION;
}
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;
static int64_t nBlocksTotal = 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).
*/
bool CChainState::ConnectBlock(const CBlock &block, BlockValidationState &state,
CBlockIndex *pindex, CCoinsViewCache &view,
const CChainParams &params,
BlockValidationOptions options,
bool fJustCheck) {
AssertLockHeld(cs_main);
assert(pindex);
assert(*pindex->phashBlock == block.GetHash());
int64_t nTimeStart = GetTimeMicros();
const Consensus::Params &consensusParams = params.GetConsensus();
// Check it again in case a previous version let a bad block in
// NOTE: We don't currently (re-)invoke ContextualCheckBlock() or
// ContextualCheckBlockHeader() here. This means that if we add a new
// consensus rule that is enforced in one of those two functions, then we
// may have let in a block that violates the rule prior to updating the
// software, and we would NOT be enforcing the rule here. Fully solving
// upgrade from one software version to the next after a consensus rule
// change is potentially tricky and issue-specific.
// Also, currently the rule against blocks more than 2 hours in the future
// is enforced in ContextualCheckBlockHeader(); we wouldn't want to
// re-enforce that rule here (at least until we make it impossible for
// GetAdjustedTime() to go backward).
if (!CheckBlock(block, state, consensusParams,
options.withCheckPoW(!fJustCheck)
.withCheckMerkleRoot(!fJustCheck))) {
if (state.GetResult() == BlockValidationResult::BLOCK_MUTATED) {
// We don't write down blocks to disk if they may have been
// corrupted, so this should be impossible unless we're having
// hardware problems.
return AbortNode(state, "Corrupt block found indicating potential "
"hardware failure; shutting down");
}
return error("%s: Consensus::CheckBlock: %s", __func__,
state.ToString());
}
// Verify that the view's current state corresponds to the previous block
BlockHash hashPrevBlock =
pindex->pprev == nullptr ? BlockHash() : pindex->pprev->GetBlockHash();
assert(hashPrevBlock == view.GetBestBlock());
nBlocksTotal++;
// Special case for the genesis block, skipping connection of its
// transactions (its coinbase is unspendable)
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 =
m_blockman.m_block_index.find(hashAssumeValid);
if (it != m_blockman.m_block_index.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.
// Script verification is skipped when connecting blocks under
// the assumevalid block. Assuming the assumevalid 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.
// The equivalent time check discourages hash power 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 (%.2fms/blk)]\n",
MILLI * (nTime1 - nTimeStart), nTimeCheck * MICRO,
nTimeCheck * MILLI / nBlocksTotal);
// 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, CVE-2012-1909, 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->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 it's 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.
// BIP34 requires that a block at height X (block X) has its coinbase
// scriptSig start with a CScriptNum of X (indicated height X). The above
// logic of no longer requiring BIP30 once BIP34 activates is flawed in the
// case that there is a block X before the BIP34 height of 227,931 which has
// an indicated height Y where Y is greater than X. The coinbase for block
// X would also be a valid coinbase for block Y, which could be a BIP30
// violation. An exhaustive search of all mainnet coinbases before the
// BIP34 height which have an indicated height greater than the block height
// reveals many occurrences. The 3 lowest indicated heights found are
// 209,921, 490,897, and 1,983,702 and thus coinbases for blocks at these 3
// heights would be the first opportunity for BIP30 to be violated.
// The search reveals a great many blocks which have an indicated height
// greater than 1,983,702, so we simply remove the optimization to skip
// BIP30 checking for blocks at height 1,983,702 or higher. Before we reach
// that block in another 25 years or so, we should take advantage of a
// future consensus change to do a new and improved version of BIP34 that
// will actually prevent ever creating any duplicate coinbases in the
// future.
static constexpr int BIP34_IMPLIES_BIP30_LIMIT = 1983702;
// There is no potential to create a duplicate coinbase at block 209,921
// because this is still before the BIP34 height and so explicit BIP30
// checking is still active.
// The final case is block 176,684 which has an indicated height of
// 490,897. Unfortunately, this issue was not discovered until about 2 weeks
// before block 490,897 so there was not much opportunity to address this
// case other than to carefully analyze it and determine it would not be a
// problem. Block 490,897 was, in fact, mined with a different coinbase than
// block 176,684, but it is important to note that even if it hadn't been or
// is remined on an alternate fork with a duplicate coinbase, we would still
// not run into a BIP30 violation. This is because the coinbase for 176,684
// is spent in block 185,956 in transaction
// d4f7fbbf92f4a3014a230b2dc70b8058d02eb36ac06b4a0736d9d60eaa9e8781. This
// spending transaction can't be duplicated because it also spends coinbase
// 0328dd85c331237f18e781d692c92de57649529bd5edf1d01036daea32ffde29. This
// coinbase has an indicated height of over 4.2 billion, and wouldn't be
// duplicatable until that height, and it's currently impossible to create a
// chain that long. Nevertheless we may wish to consider a future soft fork
// which retroactively prevents block 490,897 from creating a duplicate
// coinbase. The two historical BIP30 violations often provide a confusing
// edge case when manipulating the UTXO and it would be simpler not to have
// another edge case to deal with.
// testnet3 has no blocks before the BIP34 height with indicated heights
// post BIP34 before approximately height 486,000,000 and presumably will
// be reset before it reaches block 1,983,702 and starts doing unnecessary
// BIP30 checking again.
assert(pindex->pprev);
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));
// TODO: Remove BIP30 checking from block height 1,983,702 on, once we have
// a consensus change that ensures coinbases at those heights can not
// duplicate earlier coinbases.
if (fEnforceBIP30 || pindex->nHeight >= BIP34_IMPLIES_BIP30_LIMIT) {
for (const auto &tx : block.vtx) {
for (size_t o = 0; o < tx->vout.size(); o++) {
if (view.HaveCoin(COutPoint(tx->GetId(), o))) {
LogPrintf("ERROR: ConnectBlock(): tried to overwrite "
"transaction\n");
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-txns-BIP30");
}
}
}
}
// Start enforcing BIP68 (sequence locks).
int nLockTimeFlags = 0;
if (pindex->nHeight >= consensusParams.CSVHeight) {
nLockTimeFlags |= LOCKTIME_VERIFY_SEQUENCE;
}
const uint32_t flags =
GetNextBlockScriptFlags(consensusParams, pindex->pprev);
int64_t nTime2 = GetTimeMicros();
nTimeForks += nTime2 - nTime1;
LogPrint(BCLog::BENCH, " - Fork checks: %.2fms [%.2fs (%.2fms/blk)]\n",
MILLI * (nTime2 - nTime1), nTimeForks * MICRO,
nTimeForks * MILLI / nBlocksTotal);
std::vector<int> prevheights;
Amount nFees = Amount::zero();
int nInputs = 0;
// Limit the total executed signature operations in the block, a consensus
// rule. Tracking during the CPU-consuming part (validation of uncached
// inputs) is per-input atomic and validation in each thread stops very
// quickly after the limit is exceeded, so an adversary cannot cause us to
// exceed the limit by much at all.
CheckInputsLimiter nSigChecksBlockLimiter(
GetMaxBlockSigChecksCount(options.getExcessiveBlockSize()));
std::vector<TxSigCheckLimiter> nSigChecksTxLimiters;
nSigChecksTxLimiters.resize(block.vtx.size() - 1);
CBlockUndo blockundo;
blockundo.vtxundo.resize(block.vtx.size() - 1);
CCheckQueueControl<CScriptCheck> control(fScriptChecks ? &scriptcheckqueue
: nullptr);
// Add all outputs
try {
for (const auto &ptx : block.vtx) {
AddCoins(view, *ptx, pindex->nHeight);
}
} catch (const std::logic_error &e) {
// This error will be thrown from AddCoin if we try to connect a block
// containing duplicate transactions. Such a thing should normally be
// caught early nowadays (due to ContextualCheckBlock's CTOR
// enforcement) however some edge cases can escape that:
// - ContextualCheckBlock does not get re-run after saving the block to
// disk, and older versions may have saved a weird block.
// - its checks are not applied to pre-CTOR chains, which we might visit
// with checkpointing off.
LogPrintf("ERROR: ConnectBlock(): tried to overwrite transaction\n");
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"tx-duplicate");
}
size_t txIndex = 0;
for (const auto &ptx : block.vtx) {
const CTransaction &tx = *ptx;
const bool isCoinBase = tx.IsCoinBase();
nInputs += tx.vin.size();
{
Amount txfee = Amount::zero();
TxValidationState tx_state;
if (!isCoinBase &&
!Consensus::CheckTxInputs(tx, tx_state, view, pindex->nHeight,
txfee)) {
// Any transaction validation failure in ConnectBlock is a block
// consensus failure.
state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
tx_state.GetRejectReason(),
tx_state.GetDebugMessage());
return error("%s: Consensus::CheckTxInputs: %s, %s", __func__,
tx.GetId().ToString(), state.ToString());
}
nFees += txfee;
}
if (!MoneyRange(nFees)) {
LogPrintf("ERROR: %s: accumulated fee in the block out of range.\n",
__func__);
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-txns-accumulated-fee-outofrange");
}
// The following checks do not apply to the coinbase.
if (isCoinBase) {
continue;
}
// 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)) {
LogPrintf("ERROR: %s: contains a non-BIP68-final transaction\n",
__func__);
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-txns-nonfinal");
}
// Don't cache results if we're actually connecting blocks (still
// consult the cache, though).
bool fCacheResults = fJustCheck;
const bool fEnforceSigCheck = flags & SCRIPT_ENFORCE_SIGCHECKS;
if (!fEnforceSigCheck) {
// Historically, there has been transactions with a very high
// sigcheck count, so we need to disable this check for such
// transactions.
nSigChecksTxLimiters[txIndex] = TxSigCheckLimiter::getDisabled();
}
std::vector<CScriptCheck> vChecks;
// nSigChecksRet may be accurate (found in cache) or 0 (checks were
// deferred into vChecks).
int nSigChecksRet;
TxValidationState tx_state;
if (fScriptChecks &&
!CheckInputScripts(tx, tx_state, view, flags, fCacheResults,
fCacheResults, PrecomputedTransactionData(tx),
nSigChecksRet, nSigChecksTxLimiters[txIndex],
&nSigChecksBlockLimiter, &vChecks)) {
// Any transaction validation failure in ConnectBlock is a block
// consensus failure
state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
tx_state.GetRejectReason(),
tx_state.GetDebugMessage());
return error(
"ConnectBlock(): CheckInputScripts on %s failed with %s",
tx.GetId().ToString(), state.ToString());
}
control.Add(vChecks);
// Note: this must execute in the same iteration as CheckTxInputs (not
// in a separate loop) in order to detect double spends. However,
// this does not prevent double-spending by duplicated transaction
// inputs in the same transaction (cf. CVE-2018-17144) -- that check is
// done in CheckBlock (CheckRegularTransaction).
SpendCoins(view, tx, blockundo.vtxundo.at(txIndex), pindex->nHeight);
txIndex++;
}
int64_t nTime3 = GetTimeMicros();
nTimeConnect += nTime3 - nTime2;
LogPrint(BCLog::BENCH,
" - Connect %u transactions: %.2fms (%.3fms/tx, %.3fms/txin) "
"[%.2fs (%.2fms/blk)]\n",
(unsigned)block.vtx.size(), MILLI * (nTime3 - nTime2),
MILLI * (nTime3 - nTime2) / block.vtx.size(),
nInputs <= 1 ? 0 : MILLI * (nTime3 - nTime2) / (nInputs - 1),
nTimeConnect * MICRO, nTimeConnect * MILLI / nBlocksTotal);
Amount blockReward =
nFees + GetBlockSubsidy(pindex->nHeight, consensusParams);
if (block.vtx[0]->GetValueOut() > blockReward) {
LogPrintf("ERROR: ConnectBlock(): coinbase pays too much (actual=%d vs "
"limit=%d)\n",
block.vtx[0]->GetValueOut(), blockReward);
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-cb-amount");
}
const std::vector<CTxDestination> whitelist =
GetMinerFundWhitelist(consensusParams, pindex->pprev);
if (!whitelist.empty()) {
const Amount required = GetMinerFundAmount(blockReward);
for (auto &o : block.vtx[0]->vout) {
if (o.nValue < required) {
// This output doesn't qualify because its amount is too low.
continue;
}
CTxDestination address;
if (!ExtractDestination(o.scriptPubKey, address)) {
// Cannot decode address.
continue;
}
if (std::find(whitelist.begin(), whitelist.end(), address) !=
whitelist.end()) {
goto MinerFundSuccess;
}
}
// We did not find an output that match the miner fund requirements.
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-cb-minerfund");
}
MinerFundSuccess:
if (!control.Wait()) {
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"blk-bad-inputs", "parallel script check failed");
}
int64_t nTime4 = GetTimeMicros();
nTimeVerify += nTime4 - nTime2;
LogPrint(
BCLog::BENCH,
" - Verify %u txins: %.2fms (%.3fms/txin) [%.2fs (%.2fms/blk)]\n",
nInputs - 1, MILLI * (nTime4 - nTime2),
nInputs <= 1 ? 0 : MILLI * (nTime4 - nTime2) / (nInputs - 1),
nTimeVerify * MICRO, nTimeVerify * MILLI / nBlocksTotal);
if (fJustCheck) {
return true;
}
if (!WriteUndoDataForBlock(blockundo, state, pindex, params)) {
return false;
}
if (!pindex->IsValid(BlockValidity::SCRIPTS)) {
pindex->RaiseValidity(BlockValidity::SCRIPTS);
setDirtyBlockIndex.insert(pindex);
}
assert(pindex->phashBlock);
// 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 (%.2fms/blk)]\n",
MILLI * (nTime5 - nTime4), nTimeIndex * MICRO,
nTimeIndex * MILLI / nBlocksTotal);
int64_t nTime6 = GetTimeMicros();
nTimeCallbacks += nTime6 - nTime5;
LogPrint(BCLog::BENCH, " - Callbacks: %.2fms [%.2fs (%.2fms/blk)]\n",
MILLI * (nTime6 - nTime5), nTimeCallbacks * MICRO,
nTimeCallbacks * MILLI / nBlocksTotal);
return true;
}
CoinsCacheSizeState
CChainState::GetCoinsCacheSizeState(const CTxMemPool &tx_pool) {
return this->GetCoinsCacheSizeState(
tx_pool, m_coinstip_cache_size_bytes,
gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
}
CoinsCacheSizeState
CChainState::GetCoinsCacheSizeState(const CTxMemPool &tx_pool,
size_t max_coins_cache_size_bytes,
size_t max_mempool_size_bytes) {
int64_t nMempoolUsage = tx_pool.DynamicMemoryUsage();
int64_t cacheSize = CoinsTip().DynamicMemoryUsage();
int64_t nTotalSpace =
max_coins_cache_size_bytes +
std::max<int64_t>(max_mempool_size_bytes - nMempoolUsage, 0);
//! No need to periodic flush if at least this much space still available.
static constexpr int64_t MAX_BLOCK_COINSDB_USAGE_BYTES =
10 * 1024 * 1024; // 10MB
int64_t large_threshold = std::max(
(9 * nTotalSpace) / 10, nTotalSpace - MAX_BLOCK_COINSDB_USAGE_BYTES);
if (cacheSize > nTotalSpace) {
LogPrintf("Cache size (%s) exceeds total space (%s)\n", cacheSize,
nTotalSpace);
return CoinsCacheSizeState::CRITICAL;
} else if (cacheSize > large_threshold) {
return CoinsCacheSizeState::LARGE;
}
return CoinsCacheSizeState::OK;
}
bool CChainState::FlushStateToDisk(const CChainParams &chainparams,
BlockValidationState &state,
FlushStateMode mode,
int nManualPruneHeight) {
LOCK(cs_main);
assert(this->CanFlushToDisk());
static std::chrono::microseconds nLastWrite{0};
static std::chrono::microseconds nLastFlush{0};
std::set<int> setFilesToPrune;
bool full_flush_completed = false;
const size_t coins_count = CoinsTip().GetCacheSize();
const size_t coins_mem_usage = CoinsTip().DynamicMemoryUsage();
try {
{
bool fFlushForPrune = false;
bool fDoFullFlush = false;
CoinsCacheSizeState cache_state =
GetCoinsCacheSizeState(::g_mempool);
LOCK(cs_LastBlockFile);
if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) &&
!fReindex) {
if (nManualPruneHeight > 0) {
LOG_TIME_MILLIS_WITH_CATEGORY(
"find files to prune (manual)", BCLog::BENCH);
FindFilesToPruneManual(g_chainman, setFilesToPrune,
nManualPruneHeight);
} else {
LOG_TIME_MILLIS_WITH_CATEGORY("find files to prune",
BCLog::BENCH);
FindFilesToPrune(g_chainman, setFilesToPrune,
chainparams.PruneAfterHeight());
fCheckForPruning = false;
}
if (!setFilesToPrune.empty()) {
fFlushForPrune = true;
if (!fHavePruned) {
pblocktree->WriteFlag("prunedblockfiles", true);
fHavePruned = true;
}
}
}
const auto nNow = GetTime<std::chrono::microseconds>();
// Avoid writing/flushing immediately after startup.
if (nLastWrite.count() == 0) {
nLastWrite = nNow;
}
if (nLastFlush.count() == 0) {
nLastFlush = nNow;
}
// 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 == FlushStateMode::PERIODIC &&
cache_state >= CoinsCacheSizeState::LARGE;
// The cache is over the limit, we have to write now.
bool fCacheCritical = mode == FlushStateMode::IF_NEEDED &&
cache_state >= CoinsCacheSizeState::CRITICAL;
// 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 == FlushStateMode::PERIODIC &&
nNow > nLastWrite + DATABASE_WRITE_INTERVAL;
// It's been very long since we flushed the cache. Do this
// infrequently, to optimize cache usage.
bool fPeriodicFlush = mode == FlushStateMode::PERIODIC &&
nNow > nLastFlush + DATABASE_FLUSH_INTERVAL;
// Combine all conditions that result in a full cache flush.
fDoFullFlush = (mode == FlushStateMode::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(GetBlocksDir())) {
return AbortNode(state, "Disk space is too low!",
_("Disk space is too low!"));
}
{
LOG_TIME_MILLIS_WITH_CATEGORY(
"write block and undo data to disk", BCLog::BENCH);
// 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).
{
LOG_TIME_MILLIS_WITH_CATEGORY("write block index to disk",
BCLog::BENCH);
std::vector<std::pair<int, const CBlockFileInfo *>> vFiles;
vFiles.reserve(setDirtyFileInfo.size());
for (int i : setDirtyFileInfo) {
vFiles.push_back(std::make_pair(i, &vinfoBlockFile[i]));
}
setDirtyFileInfo.clear();
std::vector<const CBlockIndex *> vBlocks;
vBlocks.reserve(setDirtyBlockIndex.size());
for (const CBlockIndex *cbi : setDirtyBlockIndex) {
vBlocks.push_back(cbi);
}
setDirtyBlockIndex.clear();
if (!pblocktree->WriteBatchSync(vFiles, nLastBlockFile,
vBlocks)) {
return AbortNode(
state, "Failed to write to block index database");
}
}
// Finally remove any pruned files
if (fFlushForPrune) {
LOG_TIME_MILLIS_WITH_CATEGORY("unlink pruned files",
BCLog::BENCH);
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 && !CoinsTip().GetBestBlock().IsNull()) {
LOG_TIME_SECONDS(
strprintf("write coins cache to disk (%d coins, %.2fkB)",
coins_count, coins_mem_usage / 1000));
// 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(GetDataDir(),
48 * 2 * 2 * CoinsTip().GetCacheSize())) {
return AbortNode(state, "Disk space is too low!",
_("Disk space is too low!"));
}
// Flush the chainstate (which may refer to block index
// entries).
if (!CoinsTip().Flush()) {
return AbortNode(state, "Failed to write to coin database");
}
nLastFlush = nNow;
full_flush_completed = true;
}
}
if (full_flush_completed) {
// Update best block in wallet (so we can detect restored wallets).
GetMainSignals().ChainStateFlushed(m_chain.GetLocator());
}
} catch (const std::runtime_error &e) {
return AbortNode(state, std::string("System error while flushing: ") +
e.what());
}
return true;
}
void CChainState::ForceFlushStateToDisk() {
BlockValidationState state;
const CChainParams &chainparams = Params();
if (!this->FlushStateToDisk(chainparams, state, FlushStateMode::ALWAYS)) {
LogPrintf("%s: failed to flush state (%s)\n", __func__,
state.ToString());
}
}
void CChainState::PruneAndFlush() {
BlockValidationState state;
fCheckForPruning = true;
const CChainParams &chainparams = Params();
if (!this->FlushStateToDisk(chainparams, state, FlushStateMode::NONE)) {
LogPrintf("%s: failed to flush state (%s)\n", __func__,
state.ToString());
}
}
/** Check warning conditions and do some notifications on new chain tip set. */
static void UpdateTip(const CChainParams &params, CBlockIndex *pindexNew)
EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
// New best block
g_mempool.AddTransactionsUpdated(1);
{
LOCK(g_best_block_mutex);
g_best_block = pindexNew->GetBlockHash();
g_best_block_cv.notify_all();
}
LogPrintf("%s: new best=%s height=%d version=0x%08x log2_work=%.8g tx=%ld "
"date='%s' progress=%f cache=%.1fMiB(%utxo)\n",
__func__, pindexNew->GetBlockHash().ToString(),
pindexNew->nHeight, pindexNew->nVersion,
log(pindexNew->nChainWork.getdouble()) / log(2.0),
pindexNew->GetChainTxCount(),
FormatISO8601DateTime(pindexNew->GetBlockTime()),
GuessVerificationProgress(params.TxData(), pindexNew),
::ChainstateActive().CoinsTip().DynamicMemoryUsage() *
(1.0 / (1 << 20)),
::ChainstateActive().CoinsTip().GetCacheSize());
}
/**
* Disconnect m_chain'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).
*/
bool CChainState::DisconnectTip(const CChainParams &params,
BlockValidationState &state,
DisconnectedBlockTransactions *disconnectpool) {
AssertLockHeld(cs_main);
CBlockIndex *pindexDelete = m_chain.Tip();
const Consensus::Params &consensusParams = params.GetConsensus();
assert(pindexDelete);
// Read block from disk.
std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
CBlock &block = *pblock;
if (!ReadBlockFromDisk(block, pindexDelete, consensusParams)) {
return error("DisconnectTip(): Failed to read block");
}
// Apply the block atomically to the chain state.
int64_t nStart = GetTimeMicros();
{
CCoinsViewCache view(&CoinsTip());
assert(view.GetBestBlock() == pindexDelete->GetBlockHash());
if (DisconnectBlock(block, pindexDelete, view) !=
DisconnectResult::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) * MILLI);
// Write the chain state to disk, if necessary.
if (!FlushStateToDisk(params, state, FlushStateMode::IF_NEEDED)) {
return false;
}
// If this block is deactivating a fork, we move all mempool transactions
// in front of disconnectpool for reprocessing in a future
// updateMempoolForReorg call
if (pindexDelete->pprev != nullptr &&
GetNextBlockScriptFlags(consensusParams, pindexDelete) !=
GetNextBlockScriptFlags(consensusParams, pindexDelete->pprev)) {
LogPrint(BCLog::MEMPOOL,
"Disconnecting mempool due to rewind of upgrade block\n");
if (disconnectpool) {
disconnectpool->importMempool(g_mempool);
}
g_mempool.clear();
}
if (disconnectpool) {
disconnectpool->addForBlock(block.vtx, g_mempool);
}
// If the tip is finalized, then undo it.
if (m_finalizedBlockIndex == pindexDelete) {
m_finalizedBlockIndex = pindexDelete->pprev;
}
m_chain.SetTip(pindexDelete->pprev);
// Update ::ChainActive() and related variables.
UpdateTip(params, pindexDelete->pprev);
// Let wallets know transactions went from 1-confirmed to
// 0-confirmed or conflicted:
GetMainSignals().BlockDisconnected(pblock, pindexDelete);
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<const CBlock> pblock;
PerBlockConnectTrace() {}
};
/**
* Used to track blocks whose transactions were applied to the UTXO state as a
* part of a single ActivateBestChainStep call.
*
* 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<PerBlockConnectTrace> blocksConnected;
public:
explicit ConnectTrace() : blocksConnected(1) {}
void BlockConnected(CBlockIndex *pindex,
std::shared_ptr<const CBlock> pblock) {
assert(!blocksConnected.back().pindex);
assert(pindex);
assert(pblock);
blocksConnected.back().pindex = pindex;
blocksConnected.back().pblock = std::move(pblock);
blocksConnected.emplace_back();
}
std::vector<PerBlockConnectTrace> &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);
blocksConnected.pop_back();
return blocksConnected;
}
};
bool CChainState::MarkBlockAsFinal(BlockValidationState &state,
const CBlockIndex *pindex) {
AssertLockHeld(cs_main);
if (pindex->nStatus.isInvalid()) {
// We try to finalize an invalid block.
LogPrintf("ERROR: %s: Trying to finalize invalid block %s\n", __func__,
pindex->GetBlockHash().ToString());
return state.Invalid(BlockValidationResult::BLOCK_CACHED_INVALID,
"finalize-invalid-block");
}
// Check that the request is consistent with current finalization.
if (m_finalizedBlockIndex &&
!AreOnTheSameFork(pindex, m_finalizedBlockIndex)) {
LogPrintf("ERROR: %s: Trying to finalize block %s which conflicts with "
"already finalized block\n",
__func__, pindex->GetBlockHash().ToString());
return state.Invalid(BlockValidationResult::BLOCK_FINALIZATION,
"bad-fork-prior-finalized");
}
if (IsBlockFinalized(pindex)) {
// The block is already finalized.
return true;
}
// We have a new block to finalize.
m_finalizedBlockIndex = pindex;
return true;
}
static const CBlockIndex *FindBlockToFinalize(CBlockIndex *pindexNew)
EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
AssertLockHeld(cs_main);
const int32_t maxreorgdepth =
gArgs.GetArg("-maxreorgdepth", DEFAULT_MAX_REORG_DEPTH);
const int64_t finalizationdelay =
gArgs.GetArg("-finalizationdelay", DEFAULT_MIN_FINALIZATION_DELAY);
// Find our candidate.
// If maxreorgdepth is < 0 pindex will be null and auto finalization
// disabled
const CBlockIndex *pindex =
pindexNew->GetAncestor(pindexNew->nHeight - maxreorgdepth);
int64_t now = GetTime();
// If the finalization delay is not expired since the startup time,
// finalization should be avoided. Header receive time is not saved to disk
// and so cannot be anterior to startup time.
if (now < (GetStartupTime() + finalizationdelay)) {
return nullptr;
}
// While our candidate is not eligible (finalization delay not expired), try
// the previous one.
while (pindex && (pindex != ::ChainstateActive().GetFinalizedBlock())) {
// Check that the block to finalize is known for a long enough time.
// This test will ensure that an attacker could not cause a block to
// finalize by forking the chain with a depth > maxreorgdepth.
// If the block is loaded from disk, header receive time is 0 and the
// block will be finalized. This is safe because the delay since the
// node startup is already expired.
auto headerReceivedTime = pindex->GetHeaderReceivedTime();
// If finalization delay is <= 0, finalization always occurs immediately
if (now >= (headerReceivedTime + finalizationdelay)) {
return pindex;
}
pindex = pindex->pprev;
}
return nullptr;
}
/**
* Connect a new block to m_chain. 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.
*/
bool CChainState::ConnectTip(const Config &config, BlockValidationState &state,
CBlockIndex *pindexNew,
const std::shared_ptr<const CBlock> &pblock,
ConnectTrace &connectTrace,
DisconnectedBlockTransactions &disconnectpool) {
AssertLockHeld(cs_main);
AssertLockHeld(g_mempool.cs);
const CChainParams &params = config.GetChainParams();
const Consensus::Params &consensusParams = params.GetConsensus();
assert(pindexNew->pprev == m_chain.Tip());
// Read block from disk.
int64_t nTime1 = GetTimeMicros();
std::shared_ptr<const CBlock> pthisBlock;
if (!pblock) {
std::shared_ptr<CBlock> pblockNew = std::make_shared<CBlock>();
if (!ReadBlockFromDisk(*pblockNew, pindexNew, consensusParams)) {
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) * MILLI, nTimeReadFromDisk * MICRO);
{
CCoinsViewCache view(&CoinsTip());
bool rv = ConnectBlock(blockConnecting, state, pindexNew, view, params,
BlockValidationOptions(config));
GetMainSignals().BlockChecked(blockConnecting, state);
if (!rv) {
if (state.IsInvalid()) {
InvalidBlockFound(pindexNew, state);
}
return error("%s: ConnectBlock %s failed, %s", __func__,
pindexNew->GetBlockHash().ToString(),
state.ToString());
}
// Update the finalized block.
const CBlockIndex *pindexToFinalize = FindBlockToFinalize(pindexNew);
if (pindexToFinalize && !MarkBlockAsFinal(state, pindexToFinalize)) {
return error("ConnectTip(): MarkBlockAsFinal %s failed (%s)",
pindexNew->GetBlockHash().ToString(),
state.ToString());
}
nTime3 = GetTimeMicros();
nTimeConnectTotal += nTime3 - nTime2;
assert(nBlocksTotal > 0);
LogPrint(BCLog::BENCH,
" - Connect total: %.2fms [%.2fs (%.2fms/blk)]\n",
(nTime3 - nTime2) * MILLI, nTimeConnectTotal * MICRO,
nTimeConnectTotal * MILLI / nBlocksTotal);
bool flushed = view.Flush();
assert(flushed);
}
int64_t nTime4 = GetTimeMicros();
nTimeFlush += nTime4 - nTime3;
LogPrint(BCLog::BENCH, " - Flush: %.2fms [%.2fs (%.2fms/blk)]\n",
(nTime4 - nTime3) * MILLI, nTimeFlush * MICRO,
nTimeFlush * MILLI / nBlocksTotal);
// Write the chain state to disk, if necessary.
if (!FlushStateToDisk(config.GetChainParams(), state,
FlushStateMode::IF_NEEDED)) {
return false;
}
int64_t nTime5 = GetTimeMicros();
nTimeChainState += nTime5 - nTime4;
LogPrint(BCLog::BENCH,
" - Writing chainstate: %.2fms [%.2fs (%.2fms/blk)]\n",
(nTime5 - nTime4) * MILLI, nTimeChainState * MICRO,
nTimeChainState * MILLI / nBlocksTotal);
// Remove conflicting transactions from the mempool.;
g_mempool.removeForBlock(blockConnecting.vtx, pindexNew->nHeight);
disconnectpool.removeForBlock(blockConnecting.vtx);
// If this block is activating a fork, we move all mempool transactions
// in front of disconnectpool for reprocessing in a future
// updateMempoolForReorg call
if (pindexNew->pprev != nullptr &&
GetNextBlockScriptFlags(consensusParams, pindexNew) !=
GetNextBlockScriptFlags(consensusParams, pindexNew->pprev)) {
LogPrint(BCLog::MEMPOOL,
"Disconnecting mempool due to acceptance of upgrade block\n");
disconnectpool.importMempool(g_mempool);
}
// Update m_chain & related variables.
m_chain.SetTip(pindexNew);
UpdateTip(params, pindexNew);
int64_t nTime6 = GetTimeMicros();
nTimePostConnect += nTime6 - nTime5;
nTimeTotal += nTime6 - nTime1;
LogPrint(BCLog::BENCH,
" - Connect postprocess: %.2fms [%.2fs (%.2fms/blk)]\n",
(nTime6 - nTime5) * MILLI, nTimePostConnect * MICRO,
nTimePostConnect * MILLI / nBlocksTotal);
LogPrint(BCLog::BENCH, "- Connect block: %.2fms [%.2fs (%.2fms/blk)]\n",
(nTime6 - nTime1) * MILLI, nTimeTotal * MICRO,
nTimeTotal * MILLI / nBlocksTotal);
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).
*/
CBlockIndex *CChainState::FindMostWorkChain() {
AssertLockHeld(cs_main);
do {
CBlockIndex *pindexNew = nullptr;
// Find the best candidate header.
{
std::set<CBlockIndex *, CBlockIndexWorkComparator>::reverse_iterator
it = setBlockIndexCandidates.rbegin();
if (it == setBlockIndexCandidates.rend()) {
return nullptr;
}
pindexNew = *it;
}
// If this block will cause a finalized block to be reorged, then we
// mark it as invalid.
if (m_finalizedBlockIndex &&
!AreOnTheSameFork(pindexNew, m_finalizedBlockIndex)) {
LogPrintf("Mark block %s invalid because it forks prior to the "
"finalization point %d.\n",
pindexNew->GetBlockHash().ToString(),
m_finalizedBlockIndex->nHeight);
pindexNew->nStatus = pindexNew->nStatus.withFailed();
InvalidChainFound(pindexNew);
}
const bool fAvalancheEnabled =
gArgs.GetBoolArg("-enableavalanche", AVALANCHE_DEFAULT_ENABLED);
const bool fAutoUnpark =
gArgs.GetBoolArg("-automaticunparking", !fAvalancheEnabled);
const CBlockIndex *pindexFork = m_chain.FindFork(pindexNew);
// 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 hasValidAncestor = true;
while (hasValidAncestor && pindexTest && pindexTest != pindexFork) {
assert(pindexTest->HaveTxsDownloaded() || pindexTest->nHeight == 0);
// If this is a parked chain, but it has enough PoW, clear the park
// state.
bool fParkedChain = pindexTest->nStatus.isOnParkedChain();
if (fAutoUnpark && fParkedChain) {
const CBlockIndex *pindexTip = m_chain.Tip();
// During initialization, pindexTip and/or pindexFork may be
// null. In this case, we just ignore the fact that the chain is
// parked.
if (!pindexTip || !pindexFork) {
UnparkBlock(pindexTest);
continue;
}
// A parked chain can be unparked if it has twice as much PoW
// accumulated as the main chain has since the fork block.
CBlockIndex const *pindexExtraPow = pindexTip;
arith_uint256 requiredWork = pindexTip->nChainWork;
switch (pindexTip->nHeight - pindexFork->nHeight) {
// Limit the penality for depth 1, 2 and 3 to half a block
// worth of work to ensure we don't fork accidentally.
case 3:
case 2:
pindexExtraPow = pindexExtraPow->pprev;
// FALLTHROUGH
case 1: {
const arith_uint256 deltaWork =
pindexExtraPow->nChainWork - pindexFork->nChainWork;
requiredWork += (deltaWork >> 1);
break;
}
default:
requiredWork +=
pindexExtraPow->nChainWork - pindexFork->nChainWork;
break;
}
if (pindexNew->nChainWork > requiredWork) {
// We have enough, clear the parked state.
LogPrintf("Unpark chain up to block %s as it has "
"accumulated enough PoW.\n",
pindexNew->GetBlockHash().ToString());
fParkedChain = false;
UnparkBlock(pindexTest);
}
}
// 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 fInvalidChain = pindexTest->nStatus.isInvalid();
bool fMissingData = !pindexTest->nStatus.hasData();
if (!(fInvalidChain || fParkedChain || fMissingData)) {
// The current block is acceptable, move to the parent, up to
// the fork point.
pindexTest = pindexTest->pprev;
continue;
}
// Candidate chain is not usable (either invalid or parked or
// missing data)
hasValidAncestor = false;
setBlockIndexCandidates.erase(pindexTest);
if (fInvalidChain &&
(pindexBestInvalid == nullptr ||
pindexNew->nChainWork > pindexBestInvalid->nChainWork)) {
pindexBestInvalid = pindexNew;
}
if (fParkedChain &&
(pindexBestParked == nullptr ||
pindexNew->nChainWork > pindexBestParked->nChainWork)) {
pindexBestParked = pindexNew;
}
LogPrintf("Considered switching to better tip %s but that chain "
"contains a%s%s%s block.\n",
pindexNew->GetBlockHash().ToString(),
fInvalidChain ? "n invalid" : "",
fParkedChain ? " parked" : "",
fMissingData ? " missing-data" : "");
CBlockIndex *pindexFailed = pindexNew;
// Remove the entire chain from the set.
while (pindexTest != pindexFailed) {
if (fInvalidChain || fParkedChain) {
pindexFailed->nStatus =
pindexFailed->nStatus.withFailedParent(fInvalidChain)
.withParkedParent(fParkedChain);
} else if (fMissingData) {
// If we're missing data, then add back to
// m_blocks_unlinked, so that if the block arrives in the
// future we can try adding to setBlockIndexCandidates
// again.
m_blockman.m_blocks_unlinked.insert(
std::make_pair(pindexFailed->pprev, pindexFailed));
}
setBlockIndexCandidates.erase(pindexFailed);
pindexFailed = pindexFailed->pprev;
}
if (fInvalidChain || fParkedChain) {
// We discovered a new chain tip that is either parked or
// invalid, we may want to warn.
CheckForkWarningConditionsOnNewFork(pindexNew);
}
}
if (fAvalancheEnabled && g_avalanche) {
g_avalanche->addBlockToReconcile(pindexNew);
}
// We found a candidate that has valid ancestors. This is our guy.
if (hasValidAncestor) {
return pindexNew;
}
} while (true);
}
/**
* Delete all entries in setBlockIndexCandidates that are worse than the current
* tip.
*/
void CChainState::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.
auto it = setBlockIndexCandidates.begin();
while (it != setBlockIndexCandidates.end() &&
setBlockIndexCandidates.value_comp()(*it, m_chain.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.
*
* @returns true unless a system error occurred
*/
bool CChainState::ActivateBestChainStep(
const Config &config, BlockValidationState &state,
CBlockIndex *pindexMostWork, const std::shared_ptr<const CBlock> &pblock,
bool &fInvalidFound, ConnectTrace &connectTrace) {
AssertLockHeld(cs_main);
const CBlockIndex *pindexOldTip = m_chain.Tip();
const CBlockIndex *pindexFork = m_chain.FindFork(pindexMostWork);
// Disconnect active blocks which are no longer in the best chain.
bool fBlocksDisconnected = false;
DisconnectedBlockTransactions disconnectpool;
while (m_chain.Tip() && m_chain.Tip() != pindexFork) {
if (!DisconnectTip(config.GetChainParams(), state, &disconnectpool)) {
// This is likely a fatal error, but keep the mempool consistent,
// just in case. Only remove from the mempool in this case.
disconnectpool.updateMempoolForReorg(config, false, g_mempool);
// If we're unable to disconnect a block during normal operation,
// then that is a failure of our local system -- we should abort
// rather than stay on a less work chain.
AbortNode(state,
"Failed to disconnect block; see debug.log for details");
return false;
}
fBlocksDisconnected = true;
}
// Build list of new blocks to connect.
std::vector<CBlockIndex *> 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 : reverse_iterate(vpindexToConnect)) {
if (!ConnectTip(config, state, pindexConnect,
pindexConnect == pindexMostWork
? pblock
: std::shared_ptr<const CBlock>(),
connectTrace, disconnectpool)) {
if (state.IsInvalid()) {
// The block violates a consensus rule.
if (state.GetResult() !=
BlockValidationResult::BLOCK_MUTATED) {
InvalidChainFound(vpindexToConnect.back());
}
state = BlockValidationState();
fInvalidFound = true;
fContinue = false;
break;
}
// 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.
disconnectpool.updateMempoolForReorg(config, false, g_mempool);
return false;
} else {
PruneBlockIndexCandidates();
if (!pindexOldTip ||
m_chain.Tip()->nChainWork > pindexOldTip->nChainWork) {
// We're in a better position than we were. Return
// temporarily to release the lock.
fContinue = false;
break;
}
}
}
}
if (fBlocksDisconnected || !disconnectpool.isEmpty()) {
// If any blocks were disconnected, we need to update the mempool even
// if disconnectpool is empty. The disconnectpool may also be non-empty
// if the mempool was imported due to new validation rules being in
// effect.
LogPrint(BCLog::MEMPOOL, "Updating mempool due to reorganization or "
"rules upgrade/downgrade\n");
disconnectpool.updateMempoolForReorg(config, true, g_mempool);
}
g_mempool.check(&CoinsTip());
// Callbacks/notifications for a new best chain.
if (fInvalidFound) {
CheckForkWarningConditionsOnNewFork(pindexMostWork);
} else {
CheckForkWarningConditions();
}
return true;
}
static SynchronizationState GetSynchronizationState(bool init) {
if (!init) {
return SynchronizationState::POST_INIT;
}
if (::fReindex) {
return SynchronizationState::INIT_REINDEX;
}
return SynchronizationState::INIT_DOWNLOAD;
}
static bool NotifyHeaderTip() LOCKS_EXCLUDED(cs_main) {
bool fNotify = false;
bool fInitialBlockDownload = false;
static CBlockIndex *pindexHeaderOld = nullptr;
CBlockIndex *pindexHeader = nullptr;
{
LOCK(cs_main);
pindexHeader = pindexBestHeader;
if (pindexHeader != pindexHeaderOld) {
fNotify = true;
fInitialBlockDownload =
::ChainstateActive().IsInitialBlockDownload();
pindexHeaderOld = pindexHeader;
}
}
// Send block tip changed notifications without cs_main
if (fNotify) {
uiInterface.NotifyHeaderTip(
GetSynchronizationState(fInitialBlockDownload), pindexHeader);
}
return fNotify;
}
static void LimitValidationInterfaceQueue() LOCKS_EXCLUDED(cs_main) {
AssertLockNotHeld(cs_main);
if (GetMainSignals().CallbacksPending() > 10) {
SyncWithValidationInterfaceQueue();
}
}
bool CChainState::ActivateBestChain(const Config &config,
BlockValidationState &state,
std::shared_ptr<const CBlock> 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!
AssertLockNotHeld(cs_main);
const CChainParams &params = config.GetChainParams();
// ABC maintains a fair degree of expensive-to-calculate internal state
// because this function periodically releases cs_main so that it does not
// lock up other threads for too long during large connects - and to allow
// for e.g. the callback queue to drain we use m_cs_chainstate to enforce
// mutual exclusion so that only one caller may execute this function at a
// time
LOCK(m_cs_chainstate);
CBlockIndex *pindexMostWork = nullptr;
CBlockIndex *pindexNewTip = nullptr;
int nStopAtHeight = gArgs.GetArg("-stopatheight", DEFAULT_STOPATHEIGHT);
do {
// Block until the validation queue drains. This should largely
// never happen in normal operation, however may happen during
// reindex, causing memory blowup if we run too far ahead.
// Note that if a validationinterface callback ends up calling
// ActivateBestChain this may lead to a deadlock! We should
// probably have a DEBUG_LOCKORDER test for this in the future.
LimitValidationInterfaceQueue();
{
// Lock transaction pool for at least as long as it takes for
// connectTrace to be consumed
LOCK2(cs_main, ::g_mempool.cs);
CBlockIndex *starting_tip = m_chain.Tip();
bool blocks_connected = false;
do {
// We absolutely may not unlock cs_main until we've made forward
// progress (with the exception of shutdown due to hardware
// issues, low disk space, etc).
// Destructed before cs_main is unlocked
ConnectTrace connectTrace;
if (pindexMostWork == nullptr) {
pindexMostWork = FindMostWorkChain();
}
// Whether we have anything to do at all.
if (pindexMostWork == nullptr ||
pindexMostWork == m_chain.Tip()) {
break;
}
bool fInvalidFound = false;
std::shared_ptr<const CBlock> nullBlockPtr;
if (!ActivateBestChainStep(
config, state, pindexMostWork,
pblock && pblock->GetHash() ==
pindexMostWork->GetBlockHash()
? pblock
: nullBlockPtr,
fInvalidFound, connectTrace)) {
// A system error occurred
return false;
}
blocks_connected = true;
if (fInvalidFound) {
// Wipe cache, we may need another branch now.
pindexMostWork = nullptr;
}
pindexNewTip = m_chain.Tip();
for (const PerBlockConnectTrace &trace :
connectTrace.GetBlocksConnected()) {
assert(trace.pblock && trace.pindex);
GetMainSignals().BlockConnected(trace.pblock, trace.pindex);
}
} while (!m_chain.Tip() ||
(starting_tip && CBlockIndexWorkComparator()(
m_chain.Tip(), starting_tip)));
// Check the index once we're done with the above loop, since
// we're going to release cs_main soon. If the index is in a bad
// state now, then it's better to know immediately rather than
// randomly have it cause a problem in a race.
CheckBlockIndex(params.GetConsensus());
if (!blocks_connected) {
return true;
}
const CBlockIndex *pindexFork = m_chain.FindFork(starting_tip);
bool fInitialDownload = IsInitialBlockDownload();
// Notify external listeners about the new tip.
// Enqueue while holding cs_main to ensure that UpdatedBlockTip is
// called in the order in which blocks are connected
if (pindexFork != pindexNewTip) {
// Notify ValidationInterface subscribers
GetMainSignals().UpdatedBlockTip(pindexNewTip, pindexFork,
fInitialDownload);
// Always notify the UI if a new block tip was connected
uiInterface.NotifyBlockTip(
GetSynchronizationState(fInitialDownload), pindexNewTip);
}
}
// When we reach this point, we switched to a new tip (stored in
// pindexNewTip).
if (nStopAtHeight && pindexNewTip &&
pindexNewTip->nHeight >= nStopAtHeight) {
StartShutdown();
}
// We check shutdown only after giving ActivateBestChainStep a chance to
// run once so that we never shutdown before connecting the genesis
// block during LoadChainTip(). Previously this caused an assert()
// failure during shutdown in such cases as the UTXO DB flushing checks
// that the best block hash is non-null.
if (ShutdownRequested()) {
break;
}
} while (pindexNewTip != pindexMostWork);
// Write changes periodically to disk, after relay.
if (!FlushStateToDisk(params, state, FlushStateMode::PERIODIC)) {
return false;
}
return true;
}
bool ActivateBestChain(const Config &config, BlockValidationState &state,
std::shared_ptr<const CBlock> pblock) {
return ::ChainstateActive().ActivateBestChain(config, state,
std::move(pblock));
}
bool CChainState::PreciousBlock(const Config &config,
BlockValidationState &state,
CBlockIndex *pindex) {
{
LOCK(cs_main);
if (pindex->nChainWork < m_chain.Tip()->nChainWork) {
// Nothing to do, this block is not at the tip.
return true;
}
if (m_chain.Tip()->nChainWork > nLastPreciousChainwork) {
// The chain has been extended since the last call, reset the
// counter.
nBlockReverseSequenceId = -1;
}
nLastPreciousChainwork = m_chain.Tip()->nChainWork;
setBlockIndexCandidates.erase(pindex);
pindex->nSequenceId = nBlockReverseSequenceId;
if (nBlockReverseSequenceId > std::numeric_limits<int32_t>::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--;
}
// In case this was parked, unpark it.
UnparkBlock(pindex);
// Make sure it is added to the candidate list if appropriate.
if (pindex->IsValid(BlockValidity::TRANSACTIONS) &&
pindex->HaveTxsDownloaded()) {
setBlockIndexCandidates.insert(pindex);
PruneBlockIndexCandidates();
}
}
return ActivateBestChain(config, state);
}
bool PreciousBlock(const Config &config, BlockValidationState &state,
CBlockIndex *pindex) {
return ::ChainstateActive().PreciousBlock(config, state, pindex);
}
bool CChainState::UnwindBlock(const Config &config, BlockValidationState &state,
CBlockIndex *pindex, bool invalidate) {
CBlockIndex *to_mark_failed_or_parked = pindex;
bool pindex_was_in_chain = false;
int disconnected = 0;
const CChainParams &chainparams = config.GetChainParams();
// We do not allow ActivateBestChain() to run while UnwindBlock() is
// running, as that could cause the tip to change while we disconnect
// blocks. (Note for backport of Core PR16849: we acquire
// LOCK(m_cs_chainstate) in the Park, Invalidate and FinalizeBlock functions
// due to differences in our code)
AssertLockHeld(m_cs_chainstate);
// We'll be acquiring and releasing cs_main below, to allow the validation
// callbacks to run. However, we should keep the block index in a
// consistent state as we disconnect blocks -- in particular we need to
// add equal-work blocks to setBlockIndexCandidates as we disconnect.
// To avoid walking the block index repeatedly in search of candidates,
// build a map once so that we can look up candidate blocks by chain
// work as we go.
std::multimap<const arith_uint256, CBlockIndex *> candidate_blocks_by_work;
{
LOCK(cs_main);
for (const auto &entry : m_blockman.m_block_index) {
CBlockIndex *candidate = entry.second;
// We don't need to put anything in our active chain into the
// multimap, because those candidates will be found and considered
// as we disconnect.
// Instead, consider only non-active-chain blocks that have at
// least as much work as where we expect the new tip to end up.
if (!m_chain.Contains(candidate) &&
!CBlockIndexWorkComparator()(candidate, pindex->pprev) &&
candidate->IsValid(BlockValidity::TRANSACTIONS) &&
candidate->HaveTxsDownloaded()) {
candidate_blocks_by_work.insert(
std::make_pair(candidate->nChainWork, candidate));
}
}
}
// Disconnect (descendants of) pindex, and mark them invalid.
while (true) {
if (ShutdownRequested()) {
break;
}
// Make sure the queue of validation callbacks doesn't grow unboundedly.
LimitValidationInterfaceQueue();
LOCK(cs_main);
// Lock for as long as disconnectpool is in scope to make sure
// UpdateMempoolForReorg is called after DisconnectTip without unlocking
// in between
LOCK(::g_mempool.cs);
if (!m_chain.Contains(pindex)) {
break;
}
pindex_was_in_chain = true;
CBlockIndex *invalid_walk_tip = m_chain.Tip();
// ActivateBestChain considers blocks already in m_chain
// unconditionally valid already, so force disconnect away from it.
DisconnectedBlockTransactions disconnectpool;
bool ret = DisconnectTip(chainparams, state, &disconnectpool);
// DisconnectTip will add transactions to disconnectpool.
// Adjust the mempool to be consistent with the new tip, adding
// transactions back to the mempool if disconnecting was successful,
// and we're not doing a very deep invalidation (in which case
// keeping the mempool up to date is probably futile anyway).
disconnectpool.updateMempoolForReorg(
config, /* fAddToMempool = */ (++disconnected <= 10) && ret,
::g_mempool);
if (!ret) {
return false;
}
assert(invalid_walk_tip->pprev == m_chain.Tip());
// We immediately mark the disconnected blocks as invalid.
// This prevents a case where pruned nodes may fail to invalidateblock
// and be left unable to start as they have no tip candidates (as there
// are no blocks that meet the "have data and are not invalid per
// nStatus" criteria for inclusion in setBlockIndexCandidates).
invalid_walk_tip->nStatus =
invalidate ? invalid_walk_tip->nStatus.withFailed()
: invalid_walk_tip->nStatus.withParked();
setDirtyBlockIndex.insert(invalid_walk_tip);
setBlockIndexCandidates.insert(invalid_walk_tip->pprev);
if (invalid_walk_tip == to_mark_failed_or_parked->pprev &&
(invalidate ? to_mark_failed_or_parked->nStatus.hasFailed()
: to_mark_failed_or_parked->nStatus.isParked())) {
// We only want to mark the last disconnected block as
// Failed (or Parked); its children need to be FailedParent (or
// ParkedParent) instead.
to_mark_failed_or_parked->nStatus =
(invalidate
? to_mark_failed_or_parked->nStatus.withFailed(false)
.withFailedParent()
: to_mark_failed_or_parked->nStatus.withParked(false)
.withParkedParent());
setDirtyBlockIndex.insert(to_mark_failed_or_parked);
}
// Add any equal or more work headers to setBlockIndexCandidates
auto candidate_it = candidate_blocks_by_work.lower_bound(
invalid_walk_tip->pprev->nChainWork);
while (candidate_it != candidate_blocks_by_work.end()) {
if (!CBlockIndexWorkComparator()(candidate_it->second,
invalid_walk_tip->pprev)) {
setBlockIndexCandidates.insert(candidate_it->second);
candidate_it = candidate_blocks_by_work.erase(candidate_it);
} else {
++candidate_it;
}
}
// Track the last disconnected block, so we can correct its
// FailedParent (or ParkedParent) status in future iterations, or, if
// it's the last one, call InvalidChainFound on it.
to_mark_failed_or_parked = invalid_walk_tip;
}
CheckBlockIndex(chainparams.GetConsensus());
{
LOCK(cs_main);
if (m_chain.Contains(to_mark_failed_or_parked)) {
// If the to-be-marked invalid block is in the active chain,
// something is interfering and we can't proceed.
return false;
}
// Mark pindex (or the last disconnected block) as invalid (or parked),
// even when it never was in the main chain.
to_mark_failed_or_parked->nStatus =
invalidate ? to_mark_failed_or_parked->nStatus.withFailed()
: to_mark_failed_or_parked->nStatus.withParked();
setDirtyBlockIndex.insert(to_mark_failed_or_parked);
if (invalidate) {
m_blockman.m_failed_blocks.insert(to_mark_failed_or_parked);
}
// If any new blocks somehow arrived while we were disconnecting
// (above), then the pre-calculation of what should go into
// setBlockIndexCandidates may have missed entries. This would
// technically be an inconsistency in the block index, but if we clean
// it up here, this should be an essentially unobservable error.
// Loop back over all block index entries and add any missing entries
// to setBlockIndexCandidates.
for (const std::pair<const BlockHash, CBlockIndex *> &it :
m_blockman.m_block_index) {
CBlockIndex *i = it.second;
if (i->IsValid(BlockValidity::TRANSACTIONS) &&
i->HaveTxsDownloaded() &&
!setBlockIndexCandidates.value_comp()(i, m_chain.Tip())) {
setBlockIndexCandidates.insert(i);
}
}
if (invalidate) {
InvalidChainFound(to_mark_failed_or_parked);
}
}
// Only notify about a new block tip if the active chain was modified.
if (pindex_was_in_chain) {
uiInterface.NotifyBlockTip(
GetSynchronizationState(IsInitialBlockDownload()),
to_mark_failed_or_parked->pprev);
}
return true;
}
bool CChainState::InvalidateBlock(const Config &config,
BlockValidationState &state,
CBlockIndex *pindex) {
AssertLockNotHeld(m_cs_chainstate);
// See 'Note for backport of Core PR16849' in CChainState::UnwindBlock
LOCK(m_cs_chainstate);
return UnwindBlock(config, state, pindex, true);
}
bool CChainState::ParkBlock(const Config &config, BlockValidationState &state,
CBlockIndex *pindex) {
AssertLockNotHeld(m_cs_chainstate);
// See 'Note for backport of Core PR16849' in CChainState::UnwindBlock
LOCK(m_cs_chainstate);
return UnwindBlock(config, state, pindex, false);
}
bool CChainState::FinalizeBlock(const Config &config,
BlockValidationState &state,
CBlockIndex *pindex) {
AssertLockNotHeld(m_cs_chainstate);
// See 'Note for backport of Core PR16849' in CChainState::UnwindBlock
LOCK(m_cs_chainstate);
AssertLockNotHeld(cs_main);
CBlockIndex *pindexToInvalidate = nullptr;
{
LOCK(cs_main);
if (!MarkBlockAsFinal(state, pindex)) {
// state is set by MarkBlockAsFinal.
return false;
}
// We have a valid candidate, make sure it is not parked.
if (pindex->nStatus.isOnParkedChain()) {
UnparkBlock(pindex);
}
// If the finalized block is on the active chain, there is no need to
// rewind.
if (::ChainActive().Contains(pindex)) {
return true;
}
// If the finalized block is not on the active chain, that chain is
// invalid
// ...
const CBlockIndex *pindexFork = ::ChainActive().FindFork(pindex);
pindexToInvalidate = ::ChainActive().Next(pindexFork);
if (!pindexToInvalidate) {
return false;
}
} // end of locked cs_main scope
// ... therefore, we invalidate the block on the active chain that comes
// immediately after it
return UnwindBlock(config, state, pindexToInvalidate,
true /* invalidating */);
}
template <typename F>
bool CChainState::UpdateFlagsForBlock(CBlockIndex *pindexBase,
CBlockIndex *pindex, F f) {
BlockStatus newStatus = f(pindex->nStatus);
if (pindex->nStatus != newStatus &&
(!pindexBase ||
pindex->GetAncestor(pindexBase->nHeight) == pindexBase)) {
pindex->nStatus = newStatus;
setDirtyBlockIndex.insert(pindex);
if (newStatus.isValid()) {
m_blockman.m_failed_blocks.erase(pindex);
}
if (pindex->IsValid(BlockValidity::TRANSACTIONS) &&
pindex->HaveTxsDownloaded() &&
setBlockIndexCandidates.value_comp()(::ChainActive().Tip(),
pindex)) {
setBlockIndexCandidates.insert(pindex);
}
return true;
}
return false;
}
template <typename F, typename C, typename AC>
void CChainState::UpdateFlags(CBlockIndex *pindex, CBlockIndex *&pindexReset,
F f, C fChild, AC fAncestorWasChanged) {
AssertLockHeld(cs_main);
// Update the current block and ancestors; while we're doing this, identify
// which was the deepest ancestor we changed.
CBlockIndex *pindexDeepestChanged = pindex;
for (auto pindexAncestor = pindex; pindexAncestor != nullptr;
pindexAncestor = pindexAncestor->pprev) {
if (UpdateFlagsForBlock(nullptr, pindexAncestor, f)) {
pindexDeepestChanged = pindexAncestor;
}
}
if (pindexReset &&
pindexReset->GetAncestor(pindexDeepestChanged->nHeight) ==
pindexDeepestChanged) {
// reset pindexReset if it had a modified ancestor.
pindexReset = nullptr;
}
// Update all blocks under modified blocks.
BlockMap::iterator it = m_blockman.m_block_index.begin();
while (it != m_blockman.m_block_index.end()) {
UpdateFlagsForBlock(pindex, it->second, fChild);
UpdateFlagsForBlock(pindexDeepestChanged, it->second,
fAncestorWasChanged);
it++;
}
}
void CChainState::ResetBlockFailureFlags(CBlockIndex *pindex) {
AssertLockHeld(cs_main);
// In case we are reconsidering something before the finalization point,
// move the finalization point to the last common ancestor.
if (m_finalizedBlockIndex) {
m_finalizedBlockIndex =
LastCommonAncestor(pindex, m_finalizedBlockIndex);
}
UpdateFlags(
pindex, pindexBestInvalid,
[](const BlockStatus status) {
return status.withClearedFailureFlags();
},
[](const BlockStatus status) {
return status.withClearedFailureFlags();
},
[](const BlockStatus status) {
return status.withFailedParent(false);
});
}
void ResetBlockFailureFlags(CBlockIndex *pindex) {
return ::ChainstateActive().ResetBlockFailureFlags(pindex);
}
void CChainState::UnparkBlockImpl(CBlockIndex *pindex, bool fClearChildren) {
AssertLockHeld(cs_main);
UpdateFlags(
pindex, pindexBestParked,
[](const BlockStatus status) {
return status.withClearedParkedFlags();
},
[fClearChildren](const BlockStatus status) {
return fClearChildren ? status.withClearedParkedFlags()
: status.withParkedParent(false);
},
[](const BlockStatus status) {
return status.withParkedParent(false);
});
}
void UnparkBlockAndChildren(CBlockIndex *pindex) {
return ::ChainstateActive().UnparkBlockImpl(pindex, true);
}
void UnparkBlock(CBlockIndex *pindex) {
return ::ChainstateActive().UnparkBlockImpl(pindex, false);
}
bool CChainState::IsBlockFinalized(const CBlockIndex *pindex) const {
AssertLockHeld(cs_main);
return m_finalizedBlockIndex &&
m_finalizedBlockIndex->GetAncestor(pindex->nHeight) == pindex;
}
/** Return the currently finalized block index. */
const CBlockIndex *CChainState::GetFinalizedBlock() const {
AssertLockHeld(cs_main);
return m_finalizedBlockIndex;
}
CBlockIndex *BlockManager::AddToBlockIndex(const CBlockHeader &block) {
AssertLockHeld(cs_main);
// Check for duplicate
BlockHash hash = block.GetHash();
BlockMap::iterator it = m_block_index.find(hash);
if (it != m_block_index.end()) {
return it->second;
}
// Construct new block index object
CBlockIndex *pindexNew = new CBlockIndex(block);
// 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 =
m_block_index.insert(std::make_pair(hash, pindexNew)).first;
pindexNew->phashBlock = &((*mi).first);
BlockMap::iterator miPrev = m_block_index.find(block.hashPrevBlock);
if (miPrev != m_block_index.end()) {
pindexNew->pprev = (*miPrev).second;
pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
pindexNew->BuildSkip();
}
pindexNew->nTimeReceived = GetTime();
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(BlockValidity::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).
*/
void CChainState::ReceivedBlockTransactions(const CBlock &block,
CBlockIndex *pindexNew,
const FlatFilePos &pos) {
pindexNew->nTx = block.vtx.size();
pindexNew->nSize = ::GetSerializeSize(block, PROTOCOL_VERSION);
pindexNew->nFile = pos.nFile;
pindexNew->nDataPos = pos.nPos;
pindexNew->nUndoPos = 0;
pindexNew->nStatus = pindexNew->nStatus.withData();
pindexNew->RaiseValidity(BlockValidity::TRANSACTIONS);
setDirtyBlockIndex.insert(pindexNew);
if (pindexNew->UpdateChainStats()) {
// If pindexNew is the genesis block or all parents are
// BLOCK_VALID_TRANSACTIONS.
std::deque<CBlockIndex *> 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->UpdateChainStats();
if (pindex->nSequenceId == 0) {
// We assign a sequence is when transaction are received to
// prevent a miner from being able to broadcast a block but not
// its content. However, a sequence id may have been set
// manually, for instance via PreciousBlock, in which case, we
// don't need to assign one.
pindex->nSequenceId = nBlockSequenceId++;
}
if (m_chain.Tip() == nullptr ||
!setBlockIndexCandidates.value_comp()(pindex, m_chain.Tip())) {
setBlockIndexCandidates.insert(pindex);
}
std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
std::multimap<CBlockIndex *, CBlockIndex *>::iterator>
range = m_blockman.m_blocks_unlinked.equal_range(pindex);
while (range.first != range.second) {
std::multimap<CBlockIndex *, CBlockIndex *>::iterator it =
range.first;
queue.push_back(it->second);
range.first++;
m_blockman.m_blocks_unlinked.erase(it);
}
}
} else if (pindexNew->pprev &&
pindexNew->pprev->IsValid(BlockValidity::TREE)) {
m_blockman.m_blocks_unlinked.insert(
std::make_pair(pindexNew->pprev, pindexNew));
}
}
static bool FindBlockPos(FlatFilePos &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) {
bool out_of_space;
size_t bytes_allocated =
BlockFileSeq().Allocate(pos, nAddSize, out_of_space);
if (out_of_space) {
return AbortNode("Disk space is too low!",
_("Disk space is too low!"));
}
if (bytes_allocated != 0 && fPruneMode) {
fCheckForPruning = true;
}
}
setDirtyFileInfo.insert(nFile);
return true;
}
static bool FindUndoPos(BlockValidationState &state, int nFile,
FlatFilePos &pos, unsigned int nAddSize) {
pos.nFile = nFile;
LOCK(cs_LastBlockFile);
pos.nPos = vinfoBlockFile[nFile].nUndoSize;
vinfoBlockFile[nFile].nUndoSize += nAddSize;
setDirtyFileInfo.insert(nFile);
bool out_of_space;
size_t bytes_allocated =
UndoFileSeq().Allocate(pos, nAddSize, out_of_space);
if (out_of_space) {
return AbortNode(state, "Disk space is too low!",
_("Disk space is too low!"));
}
if (bytes_allocated != 0 && fPruneMode) {
fCheckForPruning = true;
}
return true;
}
/**
* Return true if the provided block header is valid.
* Only verify PoW if blockValidationOptions is configured to do so.
* This allows validation of headers on which the PoW hasn't been done.
* For example: to validate template handed to mining software.
* Do not call this for any check that depends on the context.
* For context-dependent calls, see ContextualCheckBlockHeader.
*/
static bool CheckBlockHeader(const CBlockHeader &block,
BlockValidationState &state,
const Consensus::Params &params,
BlockValidationOptions validationOptions) {
// Check proof of work matches claimed amount
if (validationOptions.shouldValidatePoW() &&
!CheckProofOfWork(block.GetHash(), block.nBits, params)) {
return state.Invalid(BlockValidationResult::BLOCK_INVALID_HEADER,
"high-hash", "proof of work failed");
}
return true;
}
bool CheckBlock(const CBlock &block, BlockValidationState &state,
const Consensus::Params &params,
BlockValidationOptions validationOptions) {
// 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(block, state, params, validationOptions)) {
return false;
}
// Check the merkle root.
if (validationOptions.shouldValidateMerkleRoot()) {
bool mutated;
uint256 hashMerkleRoot2 = BlockMerkleRoot(block, &mutated);
if (block.hashMerkleRoot != hashMerkleRoot2) {
return state.Invalid(BlockValidationResult::BLOCK_MUTATED,
"bad-txnmrklroot", "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.Invalid(BlockValidationResult::BLOCK_MUTATED,
"bad-txns-duplicate", "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.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-cb-missing", "first tx is not coinbase");
}
// Size limits.
auto nMaxBlockSize = validationOptions.getExcessiveBlockSize();
// Bail early if there is no way this block is of reasonable size.
if ((block.vtx.size() * MIN_TRANSACTION_SIZE) > nMaxBlockSize) {
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-blk-length", "size limits failed");
}
auto currentBlockSize = ::GetSerializeSize(block, PROTOCOL_VERSION);
if (currentBlockSize > nMaxBlockSize) {
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-blk-length", "size limits failed");
}
// And a valid coinbase.
TxValidationState tx_state;
if (!CheckCoinbase(*block.vtx[0], tx_state)) {
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
tx_state.GetRejectReason(),
strprintf("Coinbase check failed (txid %s) %s",
block.vtx[0]->GetId().ToString(),
tx_state.GetDebugMessage()));
}
// Check transactions for regularity, skipping the first. Note that this
// is the first time we check that all after the first are !IsCoinBase.
for (size_t i = 1; i < block.vtx.size(); i++) {
auto *tx = block.vtx[i].get();
if (!CheckRegularTransaction(*tx, tx_state)) {
return state.Invalid(
BlockValidationResult::BLOCK_CONSENSUS,
tx_state.GetRejectReason(),
strprintf("Transaction check failed (txid %s) %s",
tx->GetId().ToString(), tx_state.GetDebugMessage()));
}
}
if (validationOptions.shouldValidatePoW() &&
validationOptions.shouldValidateMerkleRoot()) {
block.fChecked = true;
}
return true;
}
/**
* Context-dependent validity checks.
* By "context", we mean only the previous block headers, but not the UTXO
* set; UTXO-related validity checks are done in ConnectBlock().
* NOTE: This function is not currently invoked by ConnectBlock(), so we
* should consider upgrade issues if we change which consensus rules are
* enforced in this function (eg by adding a new consensus rule). See comment
* in ConnectBlock().
* Note that -reindex-chainstate skips the validation that happens here!
*/
static bool ContextualCheckBlockHeader(const CChainParams &params,
const CBlockHeader &block,
BlockValidationState &state,
const CBlockIndex *pindexPrev,
int64_t nAdjustedTime)
EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
assert(pindexPrev != nullptr);
const int nHeight = pindexPrev->nHeight + 1;
// Check proof of work
if (block.nBits != GetNextWorkRequired(pindexPrev, &block, params)) {
LogPrintf("bad bits after height: %d\n", pindexPrev->nHeight);
return state.Invalid(BlockValidationResult::BLOCK_INVALID_HEADER,
"bad-diffbits", "incorrect proof of work");
}
// Check against checkpoints
if (fCheckpointsEnabled) {
const CCheckpointData &checkpoints = params.Checkpoints();
// Check that the block chain matches the known block chain up to a
// checkpoint.
if (!Checkpoints::CheckBlock(checkpoints, nHeight, block.GetHash())) {
LogPrintf("ERROR: %s: rejected by checkpoint lock-in at %d\n",
__func__, nHeight);
return state.Invalid(BlockValidationResult::BLOCK_CHECKPOINT,
"checkpoint mismatch");
}
// Don't accept any forks from the main chain prior to last checkpoint.
// GetLastCheckpoint finds the last checkpoint in MapCheckpoints that's
// in our BlockIndex().
CBlockIndex *pcheckpoint = Checkpoints::GetLastCheckpoint(checkpoints);
if (pcheckpoint && nHeight < pcheckpoint->nHeight) {
LogPrintf("ERROR: %s: forked chain older than last checkpoint "
"(height %d)\n",
__func__, nHeight);
return state.Invalid(BlockValidationResult::BLOCK_CHECKPOINT,
"bad-fork-prior-to-checkpoint");
}
}
// Check timestamp against prev
if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast()) {
return state.Invalid(BlockValidationResult::BLOCK_INVALID_HEADER,
"time-too-old", "block's timestamp is too early");
}
// Check timestamp
if (block.GetBlockTime() > nAdjustedTime + MAX_FUTURE_BLOCK_TIME) {
return state.Invalid(BlockValidationResult::BLOCK_TIME_FUTURE,
"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
const Consensus::Params &consensusParams = params.GetConsensus();
if ((block.nVersion < 2 && nHeight >= consensusParams.BIP34Height) ||
(block.nVersion < 3 && nHeight >= consensusParams.BIP66Height) ||
(block.nVersion < 4 && nHeight >= consensusParams.BIP65Height)) {
return state.Invalid(
BlockValidationResult::BLOCK_INVALID_HEADER,
strprintf("bad-version(0x%08x)", block.nVersion),
strprintf("rejected nVersion=0x%08x block", block.nVersion));
}
return true;
}
bool ContextualCheckTransactionForCurrentBlock(const Consensus::Params &params,
const CTransaction &tx,
TxValidationState &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 nMedianTimePast =
::ChainActive().Tip() == nullptr
? 0
: ::ChainActive().Tip()->GetMedianTimePast();
const int64_t nLockTimeCutoff = (flags & LOCKTIME_MEDIAN_TIME_PAST)
? nMedianTimePast
: GetAdjustedTime();
return ContextualCheckTransaction(params, tx, state, nBlockHeight,
nLockTimeCutoff, nMedianTimePast);
}
/**
* NOTE: This function is not currently invoked by ConnectBlock(), so we
* should consider upgrade issues if we change which consensus rules are
* enforced in this function (eg by adding a new consensus rule). See comment
* in ConnectBlock().
* Note that -reindex-chainstate skips the validation that happens here!
*/
static bool ContextualCheckBlock(const CBlock &block,
BlockValidationState &state,
const Consensus::Params &params,
const CBlockIndex *pindexPrev) {
const int nHeight = pindexPrev == nullptr ? 0 : pindexPrev->nHeight + 1;
// Start enforcing BIP113 (Median Time Past).
int nLockTimeFlags = 0;
if (nHeight >= params.CSVHeight) {
assert(pindexPrev != nullptr);
nLockTimeFlags |= LOCKTIME_MEDIAN_TIME_PAST;
}
const int64_t nMedianTimePast =
pindexPrev == nullptr ? 0 : pindexPrev->GetMedianTimePast();
const int64_t nLockTimeCutoff = (nLockTimeFlags & LOCKTIME_MEDIAN_TIME_PAST)
? nMedianTimePast
: block.GetBlockTime();
const bool fIsMagneticAnomalyEnabled =
IsMagneticAnomalyEnabled(params, pindexPrev);
// Check transactions:
// - canonical ordering
// - ensure they are finalized
// - perform a preliminary block-sigops count (they will be recounted more
// strictly during ConnectBlock).
// - perform a transaction-sigops check (again, a more strict check will
// happen in ConnectBlock).
const CTransaction *prevTx = nullptr;
for (const auto &ptx : block.vtx) {
const CTransaction &tx = *ptx;
if (fIsMagneticAnomalyEnabled) {
if (prevTx && (tx.GetId() <= prevTx->GetId())) {
if (tx.GetId() == prevTx->GetId()) {
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"tx-duplicate",
strprintf("Duplicated transaction %s",
tx.GetId().ToString()));
}
return state.Invalid(
BlockValidationResult::BLOCK_CONSENSUS, "tx-ordering",
strprintf("Transaction order is invalid (%s < %s)",
tx.GetId().ToString(),
prevTx->GetId().ToString()));
}
if (prevTx || !tx.IsCoinBase()) {
prevTx = &tx;
}
}
TxValidationState tx_state;
if (!ContextualCheckTransaction(params, tx, tx_state, nHeight,
nLockTimeCutoff, nMedianTimePast)) {
return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
tx_state.GetRejectReason(),
tx_state.GetDebugMessage());
}
}
// Enforce rule that the coinbase starts with serialized block height
if (nHeight >= params.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.Invalid(BlockValidationResult::BLOCK_CONSENSUS,
"bad-cb-height",
"block height mismatch in coinbase");
}
}
return true;
}
/**
* If the provided block header is valid, add it to the block index.
*
* Returns true if the block is successfully added to the block index.
*/
bool BlockManager::AcceptBlockHeader(const Config &config,
const CBlockHeader &block,
BlockValidationState &state,
CBlockIndex **ppindex) {
AssertLockHeld(cs_main);
const CChainParams &chainparams = config.GetChainParams();
// Check for duplicate
BlockHash hash = block.GetHash();
BlockMap::iterator miSelf = m_block_index.find(hash);
CBlockIndex *pindex = nullptr;
if (hash != chainparams.GetConsensus().hashGenesisBlock) {
if (miSelf != m_block_index.end()) {
// Block header is already known.
pindex = miSelf->second;
if (ppindex) {
*ppindex = pindex;
}
if (pindex->nStatus.isInvalid()) {
LogPrintf("ERROR: %s: block %s is marked invalid\n", __func__,
hash.ToString());
return state.Invalid(
BlockValidationResult::BLOCK_CACHED_INVALID, "duplicate");
}
return true;
}
if (!CheckBlockHeader(block, state, chainparams.GetConsensus(),
BlockValidationOptions(config))) {
return error("%s: Consensus::CheckBlockHeader: %s, %s", __func__,
hash.ToString(), state.ToString());
}
// Get prev block index
BlockMap::iterator mi = m_block_index.find(block.hashPrevBlock);
if (mi == m_block_index.end()) {
LogPrintf("ERROR: %s: prev block not found\n", __func__);
return state.Invalid(BlockValidationResult::BLOCK_MISSING_PREV,
"prev-blk-not-found");
}
CBlockIndex *pindexPrev = (*mi).second;
assert(pindexPrev);
if (pindexPrev->nStatus.isInvalid()) {
LogPrintf("ERROR: %s: prev block invalid\n", __func__);
return state.Invalid(BlockValidationResult::BLOCK_INVALID_PREV,
"bad-prevblk");
}
if (!ContextualCheckBlockHeader(chainparams, block, state, pindexPrev,
GetAdjustedTime())) {
return error("%s: Consensus::ContextualCheckBlockHeader: %s, %s",
__func__, hash.ToString(), state.ToString());
}
/* Determine if this block descends from any block which has been found
* invalid (m_failed_blocks), then mark pindexPrev and any blocks
* between them as failed. For example:
*
* D3
* /
* B2 - C2
* / \
* A D2 - E2 - F2
* \
* B1 - C1 - D1 - E1
*
* In the case that we attempted to reorg from E1 to F2, only to find
* C2 to be invalid, we would mark D2, E2, and F2 as BLOCK_FAILED_CHILD
* but NOT D3 (it was not in any of our candidate sets at the time).
*
* In any case D3 will also be marked as BLOCK_FAILED_CHILD at restart
* in LoadBlockIndex.
*/
if (!pindexPrev->IsValid(BlockValidity::SCRIPTS)) {
// The above does not mean "invalid": it checks if the previous
// block hasn't been validated up to BlockValidity::SCRIPTS. This is
// a performance optimization, in the common case of adding a new
// block to the tip, we don't need to iterate over the failed blocks
// list.
for (const CBlockIndex *failedit : m_failed_blocks) {
if (pindexPrev->GetAncestor(failedit->nHeight) == failedit) {
assert(failedit->nStatus.hasFailed());
CBlockIndex *invalid_walk = pindexPrev;
while (invalid_walk != failedit) {
invalid_walk->nStatus =
invalid_walk->nStatus.withFailedParent();
setDirtyBlockIndex.insert(invalid_walk);
invalid_walk = invalid_walk->pprev;
}
LogPrintf("ERROR: %s: prev block invalid\n", __func__);
return state.Invalid(
BlockValidationResult::BLOCK_INVALID_PREV,
"bad-prevblk");
}
}
}
}
if (pindex == nullptr) {
pindex = AddToBlockIndex(block);
}
if (ppindex) {
*ppindex = pindex;
}
return true;
}
// Exposed wrapper for AcceptBlockHeader
bool ChainstateManager::ProcessNewBlockHeaders(
const Config &config, const std::vector<CBlockHeader> &headers,
BlockValidationState &state, const CBlockIndex **ppindex) {
AssertLockNotHeld(cs_main);
{
LOCK(cs_main);
for (const CBlockHeader &header : headers) {
// Use a temp pindex instead of ppindex to avoid a const_cast
CBlockIndex *pindex = nullptr;
bool accepted =
m_blockman.AcceptBlockHeader(config, header, state, &pindex);
::ChainstateActive().CheckBlockIndex(
config.GetChainParams().GetConsensus());
if (!accepted) {
return false;
}
if (ppindex) {
*ppindex = pindex;
}
}
}
if (NotifyHeaderTip()) {
if (::ChainstateActive().IsInitialBlockDownload() && ppindex &&
*ppindex) {
LogPrintf("Synchronizing blockheaders, height: %d (~%.2f%%)\n",
(*ppindex)->nHeight,
100.0 /
((*ppindex)->nHeight +
(GetAdjustedTime() - (*ppindex)->GetBlockTime()) /
Params().GetConsensus().nPowTargetSpacing) *
(*ppindex)->nHeight);
}
}
return true;
}
/**
* Store block on disk. If dbp is non-nullptr, the file is known to already
* reside on disk.
*/
static FlatFilePos SaveBlockToDisk(const CBlock &block, int nHeight,
const CChainParams &chainparams,
const FlatFilePos *dbp) {
unsigned int nBlockSize = ::GetSerializeSize(block, CLIENT_VERSION);
FlatFilePos blockPos;
if (dbp != nullptr) {
blockPos = *dbp;
}
if (!FindBlockPos(blockPos, nBlockSize + 8, nHeight, block.GetBlockTime(),
dbp != nullptr)) {
error("%s: FindBlockPos failed", __func__);
return FlatFilePos();
}
if (dbp == nullptr) {
if (!WriteBlockToDisk(block, blockPos, chainparams.DiskMagic())) {
AbortNode("Failed to write block");
return FlatFilePos();
}
}
return blockPos;
}
/**
* Store a block on disk.
*
* @param[in] config The global config.
* @param[in-out] pblock The block we want to accept.
* @param[in] fRequested A boolean to indicate if this block was requested
* from our peers.
* @param[in] dbp If non-null, the disk position of the block.
* @param[in-out] fNewBlock True if block was first received via this call.
* @return True if the block is accepted as a valid block and written to disk.
*/
bool CChainState::AcceptBlock(const Config &config,
const std::shared_ptr<const CBlock> &pblock,
BlockValidationState &state, bool fRequested,
const FlatFilePos *dbp, bool *fNewBlock) {
AssertLockHeld(cs_main);
const CBlock &block = *pblock;
if (fNewBlock) {
*fNewBlock = false;
}
CBlockIndex *pindex = nullptr;
bool accepted_header =
m_blockman.AcceptBlockHeader(config, block, state, &pindex);
CheckBlockIndex(config.GetChainParams().GetConsensus());
if (!accepted_header) {
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.hasData();
// TODO: deal better with return value and error conditions for duplicate
// and unrequested blocks.
if (fAlreadyHave) {
return true;
}
// Compare block header timestamps and received times of the block and the
// chaintip. If they have the same chain height, use these diffs as a
// tie-breaker, attempting to pick the more honestly-mined block.
int64_t newBlockTimeDiff = std::llabs(pindex->GetReceivedTimeDiff());
int64_t chainTipTimeDiff =
m_chain.Tip() ? std::llabs(m_chain.Tip()->GetReceivedTimeDiff()) : 0;
bool isSameHeight =
m_chain.Tip() && (pindex->nChainWork == m_chain.Tip()->nChainWork);
if (isSameHeight) {
LogPrintf("Chain tip timestamp-to-received-time difference: hash=%s, "
"diff=%d\n",
m_chain.Tip()->GetBlockHash().ToString(), chainTipTimeDiff);
LogPrintf("New block timestamp-to-received-time difference: hash=%s, "
"diff=%d\n",
pindex->GetBlockHash().ToString(), newBlockTimeDiff);
}
bool fHasMoreOrSameWork =
(m_chain.Tip() ? pindex->nChainWork >= m_chain.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(m_chain.Height() + MIN_BLOCKS_TO_KEEP));
// TODO: Decouple this function from the block download logic by removing
// fRequested
// This requires some new chain data structure 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.
// 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 (!fHasMoreOrSameWork) {
return true;
}
// Block height is too high.
if (fTooFarAhead) {
return true;
}
// Protect against DoS attacks from low-work chains.
// If our tip is behind, a peer could try to send us
// low-work blocks on a fake chain that we would never
// request; don't process these.
if (pindex->nChainWork < nMinimumChainWork) {
return true;
}
}
const CChainParams &chainparams = config.GetChainParams();
const Consensus::Params &consensusParams = chainparams.GetConsensus();
if (!CheckBlock(block, state, consensusParams,
BlockValidationOptions(config)) ||
!ContextualCheckBlock(block, state, consensusParams, pindex->pprev)) {
if (state.IsInvalid() &&
state.GetResult() != BlockValidationResult::BLOCK_MUTATED) {
pindex->nStatus = pindex->nStatus.withFailed();
setDirtyBlockIndex.insert(pindex);
}
return error("%s: %s (block %s)", __func__, state.ToString(),
block.GetHash().ToString());
}
// If connecting the new block would require rewinding more than one block
// from the active chain (i.e., a "deep reorg"), then mark the new block as
// parked. If it has enough work then it will be automatically unparked
// later, during FindMostWorkChain. We mark the block as parked at the very
// last minute so we can make sure everything is ready to be reorged if
// needed.
if (gArgs.GetBoolArg("-parkdeepreorg", true)) {
const CBlockIndex *pindexFork = m_chain.FindFork(pindex);
if (pindexFork && pindexFork->nHeight + 1 < m_chain.Height()) {
LogPrintf("Park block %s as it would cause a deep reorg.\n",
pindex->GetBlockHash().ToString());
pindex->nStatus = pindex->nStatus.withParked();
setDirtyBlockIndex.insert(pindex);
}
}
// Header is valid/has work and the merkle tree is good.
// Relay now, but if it does not build on our best tip, let the
// SendMessages loop relay it.
if (!IsInitialBlockDownload() && m_chain.Tip() == pindex->pprev) {
GetMainSignals().NewPoWValidBlock(pindex, pblock);
}
// Write block to history file
if (fNewBlock) {
*fNewBlock = true;
}
try {
FlatFilePos blockPos =
SaveBlockToDisk(block, pindex->nHeight, chainparams, dbp);
if (blockPos.IsNull()) {
state.Error(strprintf(
"%s: Failed to find position to write new block to disk",
__func__));
return false;
}
ReceivedBlockTransactions(block, pindex, blockPos);
} catch (const std::runtime_error &e) {
return AbortNode(state, std::string("System error: ") + e.what());
}
FlushStateToDisk(chainparams, state, FlushStateMode::NONE);
CheckBlockIndex(consensusParams);
return true;
}
bool ChainstateManager::ProcessNewBlock(
const Config &config, const std::shared_ptr<const CBlock> pblock,
bool fForceProcessing, bool *fNewBlock) {
AssertLockNotHeld(cs_main);
{
if (fNewBlock) {
*fNewBlock = false;
}
BlockValidationState state;
// CheckBlock() does not support multi-threaded block validation
// because CBlock::fChecked can cause data race.
// Therefore, the following critical section must include the
// CheckBlock() call as well.
LOCK(cs_main);
// Ensure that CheckBlock() passes before calling AcceptBlock, as
// belt-and-suspenders.
bool ret =
CheckBlock(*pblock, state, config.GetChainParams().GetConsensus(),
BlockValidationOptions(config));
if (ret) {
// Store to disk
ret = ::ChainstateActive().AcceptBlock(
config, pblock, state, fForceProcessing, nullptr, fNewBlock);
}
if (!ret) {
GetMainSignals().BlockChecked(*pblock, state);
return error("%s: AcceptBlock FAILED (%s)", __func__,
state.ToString());
}
}
NotifyHeaderTip();
// Only used to report errors, not invalidity - ignore it
BlockValidationState state;
if (!::ChainstateActive().ActivateBestChain(config, state, pblock)) {
return error("%s: ActivateBestChain failed (%s)", __func__,
state.ToString());
}
return true;
}
bool TestBlockValidity(BlockValidationState &state, const CChainParams &params,
const CBlock &block, CBlockIndex *pindexPrev,
BlockValidationOptions validationOptions) {
AssertLockHeld(cs_main);
assert(pindexPrev && pindexPrev == ::ChainActive().Tip());
CCoinsViewCache viewNew(&::ChainstateActive().CoinsTip());
BlockHash block_hash(block.GetHash());
CBlockIndex indexDummy(block);
indexDummy.pprev = pindexPrev;
indexDummy.nHeight = pindexPrev->nHeight + 1;
indexDummy.phashBlock = &block_hash;
// NOTE: CheckBlockHeader is called by CheckBlock
if (!ContextualCheckBlockHeader(params, block, state, pindexPrev,
GetAdjustedTime())) {
return error("%s: Consensus::ContextualCheckBlockHeader: %s", __func__,
state.ToString());
}
if (!CheckBlock(block, state, params.GetConsensus(), validationOptions)) {
return error("%s: Consensus::CheckBlock: %s", __func__,
state.ToString());
}
if (!ContextualCheckBlock(block, state, params.GetConsensus(),
pindexPrev)) {
return error("%s: Consensus::ContextualCheckBlock: %s", __func__,
state.ToString());
}
if (!::ChainstateActive().ConnectBlock(block, state, &indexDummy, viewNew,
params, validationOptions, true)) {
return false;
}
assert(state.IsValid());
return true;
}
/**
* BLOCK PRUNING CODE
*/
/**
* Calculate the amount of disk space the block & undo files currently use.
*/
uint64_t CalculateCurrentUsage() {
LOCK(cs_LastBlockFile);
uint64_t retval = 0;
for (const CBlockFileInfo &file : vinfoBlockFile) {
retval += file.nSize + file.nUndoSize;
}
return retval;
}
void ChainstateManager::PruneOneBlockFile(const int fileNumber) {
AssertLockHeld(cs_main);
LOCK(cs_LastBlockFile);
for (const auto &entry : m_blockman.m_block_index) {
CBlockIndex *pindex = entry.second;
if (pindex->nFile == fileNumber) {
pindex->nStatus = pindex->nStatus.withData(false).withUndo(false);
pindex->nFile = 0;
pindex->nDataPos = 0;
pindex->nUndoPos = 0;
setDirtyBlockIndex.insert(pindex);
// Prune from m_blocks_unlinked -- 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
// m_blocks_unlinked or setBlockIndexCandidates.
auto range =
m_blockman.m_blocks_unlinked.equal_range(pindex->pprev);
while (range.first != range.second) {
std::multimap<CBlockIndex *, CBlockIndex *>::iterator _it =
range.first;
range.first++;
if (_it->second == pindex) {
m_blockman.m_blocks_unlinked.erase(_it);
}
}
}
}
vinfoBlockFile[fileNumber].SetNull();
setDirtyFileInfo.insert(fileNumber);
}
void UnlinkPrunedFiles(const std::set<int> &setFilesToPrune) {
for (const int i : setFilesToPrune) {
FlatFilePos pos(i, 0);
fs::remove(BlockFileSeq().FileName(pos));
fs::remove(UndoFileSeq().FileName(pos));
LogPrintf("Prune: %s deleted blk/rev (%05u)\n", __func__, i);
}
}
/**
* Calculate the block/rev files to delete based on height specified by user
* with RPC command pruneblockchain
*/
static void FindFilesToPruneManual(ChainstateManager &chainman,
std::set<int> &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;
}
chainman.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) {
BlockValidationState state;
const CChainParams &chainparams = Params();
if (!::ChainstateActive().FlushStateToDisk(
chainparams, state, FlushStateMode::NONE, nManualPruneHeight)) {
LogPrintf("%s: failed to flush state (%s)\n", __func__,
state.ToString());
}
}
/**
* 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(ChainstateManager &chainman,
std::set<int> &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) {
// On a prune event, the chainstate DB is flushed.
// To avoid excessive prune events negating the benefit of high dbcache
// values, we should not prune too rapidly.
// So when pruning in IBD, increase the buffer a bit to avoid a re-prune
// too soon.
if (::ChainstateActive().IsInitialBlockDownload()) {
// Since this is only relevant during IBD, we use a fixed 10%
nBuffer += nPruneTarget / 10;
}
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;
}
chainman.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);
}
CBlockIndex *BlockManager::InsertBlockIndex(const BlockHash &hash) {
AssertLockHeld(cs_main);
if (hash.IsNull()) {
return nullptr;
}
// Return existing
BlockMap::iterator mi = m_block_index.find(hash);
if (mi != m_block_index.end()) {
return (*mi).second;
}
// Create new
CBlockIndex *pindexNew = new CBlockIndex();
mi = m_block_index.insert(std::make_pair(hash, pindexNew)).first;
pindexNew->phashBlock = &((*mi).first);
return pindexNew;
}
bool BlockManager::LoadBlockIndex(
const Consensus::Params &params, CBlockTreeDB &blocktree,
std::set<CBlockIndex *, CBlockIndexWorkComparator>
&block_index_candidates) {
AssertLockHeld(cs_main);
if (!blocktree.LoadBlockIndexGuts(
params, [this](const BlockHash &hash) EXCLUSIVE_LOCKS_REQUIRED(
cs_main) { return this->InsertBlockIndex(hash); })) {
return false;
}
// Calculate nChainWork
std::vector<std::pair<int, CBlockIndex *>> vSortedByHeight;
vSortedByHeight.reserve(m_block_index.size());
for (const std::pair<const BlockHash, CBlockIndex *> &item :
m_block_index) {
CBlockIndex *pindex = item.second;
vSortedByHeight.push_back(std::make_pair(pindex->nHeight, pindex));
}
sort(vSortedByHeight.begin(), vSortedByHeight.end());
for (const std::pair<int, CBlockIndex *> &item : vSortedByHeight) {
if (ShutdownRequested()) {
return false;
}
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->UpdateChainStats() && pindex->pprev) {
m_blocks_unlinked.insert(std::make_pair(pindex->pprev, pindex));
}
}
if (!pindex->nStatus.hasFailed() && pindex->pprev &&
pindex->pprev->nStatus.hasFailed()) {
pindex->nStatus = pindex->nStatus.withFailedParent();
setDirtyBlockIndex.insert(pindex);
}
if (pindex->IsValid(BlockValidity::TRANSACTIONS) &&
(pindex->HaveTxsDownloaded() || pindex->pprev == nullptr)) {
block_index_candidates.insert(pindex);
}
if (pindex->nStatus.isInvalid() &&
(!pindexBestInvalid ||
pindex->nChainWork > pindexBestInvalid->nChainWork)) {
pindexBestInvalid = pindex;
}
if (pindex->nStatus.isOnParkedChain() &&
(!pindexBestParked ||
pindex->nChainWork > pindexBestParked->nChainWork)) {
pindexBestParked = pindex;
}
if (pindex->pprev) {
pindex->BuildSkip();
}
if (pindex->IsValid(BlockValidity::TREE) &&
(pindexBestHeader == nullptr ||
CBlockIndexWorkComparator()(pindexBestHeader, pindex))) {
pindexBestHeader = pindex;
}
}
return true;
}
void BlockManager::Unload() {
m_failed_blocks.clear();
m_blocks_unlinked.clear();
for (const BlockMap::value_type &entry : m_block_index) {
delete entry.second;
}
m_block_index.clear();
}
static bool LoadBlockIndexDB(ChainstateManager &chainman,
const Consensus::Params &params)
EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
if (!chainman.m_blockman.LoadBlockIndex(
params, *pblocktree,
::ChainstateActive().setBlockIndexCandidates)) {
return false;
}
// 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<int> setBlkDataFiles;
for (const std::pair<const BlockHash, CBlockIndex *> &item :
chainman.BlockIndex()) {
CBlockIndex *pindex = item.second;
if (pindex->nStatus.hasData()) {
setBlkDataFiles.insert(pindex->nFile);
}
}
for (const int i : setBlkDataFiles) {
FlatFilePos pos(i, 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
if (pblocktree->IsReindexing()) {
fReindex = true;
}
return true;
}
bool CChainState::LoadChainTip(const CChainParams &chainparams) {
AssertLockHeld(cs_main);
const CCoinsViewCache &coins_cache = CoinsTip();
// Never called when the coins view is empty
assert(!coins_cache.GetBestBlock().IsNull());
const CBlockIndex *tip = m_chain.Tip();
if (tip && tip->GetBlockHash() == coins_cache.GetBestBlock()) {
return true;
}
// Load pointer to end of best chain
CBlockIndex *pindex = LookupBlockIndex(coins_cache.GetBestBlock());
if (!pindex) {
return false;
}
m_chain.SetTip(pindex);
PruneBlockIndexCandidates();
tip = m_chain.Tip();
LogPrintf(
"Loaded best chain: hashBestChain=%s height=%d date=%s progress=%f\n",
tip->GetBlockHash().ToString(), m_chain.Height(),
FormatISO8601DateTime(tip->GetBlockTime()),
GuessVerificationProgress(chainparams.TxData(), tip));
return true;
}
CVerifyDB::CVerifyDB() {
uiInterface.ShowProgress(_("Verifying blocks...").translated, 0, false);
}
CVerifyDB::~CVerifyDB() {
uiInterface.ShowProgress("", 100, false);
}
bool CVerifyDB::VerifyDB(const Config &config, CCoinsView *coinsview,
int nCheckLevel, int nCheckDepth) {
LOCK(cs_main);
const CChainParams &params = config.GetChainParams();
const Consensus::Params &consensusParams = params.GetConsensus();
if (::ChainActive().Tip() == nullptr ||
::ChainActive().Tip()->pprev == nullptr) {
return true;
}
// Verify blocks in the best chain
if (nCheckDepth <= 0 || 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 *pindex;
CBlockIndex *pindexFailure = nullptr;
int nGoodTransactions = 0;
BlockValidationState state;
int reportDone = 0;
LogPrintfToBeContinued("[0%%]...");
for (pindex = ::ChainActive().Tip(); pindex && pindex->pprev;
pindex = pindex->pprev) {
const 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
LogPrintfToBeContinued("[%d%%]...", percentageDone);
reportDone = percentageDone / 10;
}
uiInterface.ShowProgress(_("Verifying blocks...").translated,
percentageDone, false);
if (pindex->nHeight <= ::ChainActive().Height() - nCheckDepth) {
break;
}
if (fPruneMode && !pindex->nStatus.hasData()) {
// 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, consensusParams)) {
return error(
"VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s",
pindex->nHeight, pindex->GetBlockHash().ToString());
}
// check level 1: verify block validity
if (nCheckLevel >= 1 && !CheckBlock(block, state, consensusParams,
BlockValidationOptions(config))) {
return error("%s: *** found bad block at %d, hash=%s (%s)\n",
__func__, pindex->nHeight,
pindex->GetBlockHash().ToString(), state.ToString());
}
// check level 2: verify undo validity
if (nCheckLevel >= 2 && pindex) {
CBlockUndo undo;
if (!pindex->GetUndoPos().IsNull()) {
if (!UndoReadFromDisk(undo, pindex)) {
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 &&
(coins.DynamicMemoryUsage() +
::ChainstateActive().CoinsTip().DynamicMemoryUsage()) <=
::ChainstateActive().m_coinstip_cache_size_bytes) {
assert(coins.GetBestBlock() == pindex->GetBlockHash());
DisconnectResult res =
::ChainstateActive().DisconnectBlock(block, pindex, coins);
if (res == DisconnectResult::FAILED) {
return error("VerifyDB(): *** irrecoverable inconsistency in "
"block data at %d, hash=%s",
pindex->nHeight,
pindex->GetBlockHash().ToString());
}
if (res == DisconnectResult::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);
}
// store block count as we move pindex at check level >= 4
int block_count = ::ChainActive().Height() - pindex->nHeight;
// check level 4: try reconnecting blocks
if (nCheckLevel >= 4) {
while (pindex != ::ChainActive().Tip()) {
const int percentageDone = std::max(
1, std::min(99, 100 - int(double(::ChainActive().Height() -
pindex->nHeight) /
double(nCheckDepth) * 50)));
if (reportDone < percentageDone / 10) {
// report every 10% step
LogPrintfToBeContinued("[%d%%]...", percentageDone);
reportDone = percentageDone / 10;
}
uiInterface.ShowProgress(_("Verifying blocks...").translated,
percentageDone, false);
pindex = ::ChainActive().Next(pindex);
CBlock block;
if (!ReadBlockFromDisk(block, pindex, consensusParams)) {
return error(
"VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s",
pindex->nHeight, pindex->GetBlockHash().ToString());
}
if (!::ChainstateActive().ConnectBlock(
block, state, pindex, coins, params,
BlockValidationOptions(config))) {
return error("VerifyDB(): *** found unconnectable block at %d, "
"hash=%s (%s)",
pindex->nHeight, pindex->GetBlockHash().ToString(),
state.ToString());
}
if (ShutdownRequested()) {
return true;
}
}
}
LogPrintf("[DONE].\n");
LogPrintf("No coin database inconsistencies in last %i blocks (%i "
"transactions)\n",
block_count, nGoodTransactions);
return true;
}
/**
* Apply the effects of a block on the utxo cache, ignoring that it may already
* have been applied.
*/
bool CChainState::RollforwardBlock(const CBlockIndex *pindex,
CCoinsViewCache &view,
const Consensus::Params &params) {
// TODO: merge with ConnectBlock
CBlock block;
if (!ReadBlockFromDisk(block, pindex, params)) {
return error("ReplayBlock(): ReadBlockFromDisk failed at %d, hash=%s",
pindex->nHeight, pindex->GetBlockHash().ToString());
}
for (const CTransactionRef &tx : block.vtx) {
// Pass check = true as every addition may be an overwrite.
AddCoins(view, *tx, pindex->nHeight, true);
}
for (const CTransactionRef &tx : block.vtx) {
if (tx->IsCoinBase()) {
continue;
}
for (const CTxIn &txin : tx->vin) {
view.SpendCoin(txin.prevout);
}
}
return true;
}
bool CChainState::ReplayBlocks(const Consensus::Params &params) {
LOCK(cs_main);
CCoinsView &db = this->CoinsDB();
CCoinsViewCache cache(&db);
std::vector<BlockHash> hashHeads = db.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...").translated, 0, false);
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 (m_blockman.m_block_index.count(hashHeads[0]) == 0) {
return error(
"ReplayBlocks(): reorganization to unknown block requested");
}
pindexNew = m_blockman.m_block_index[hashHeads[0]];
if (!hashHeads[1].IsNull()) {
// The old tip is allowed to be 0, indicating it's the first flush.
if (m_blockman.m_block_index.count(hashHeads[1]) == 0) {
return error(
"ReplayBlocks(): reorganization from unknown block requested");
}
pindexOld = m_blockman.m_block_index[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, params)) {
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 == DisconnectResult::FAILED) {
return error(
"RollbackBlock(): DisconnectBlock failed at %d, hash=%s",
pindexOld->nHeight, pindexOld->GetBlockHash().ToString());
}
// If DisconnectResult::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);
uiInterface.ShowProgress(_("Replaying blocks...").translated,
(int)((nHeight - nForkHeight) * 100.0 /
(pindexNew->nHeight - nForkHeight)),
false);
if (!RollforwardBlock(pindex, cache, params)) {
return false;
}
}
cache.SetBestBlock(pindexNew->GetBlockHash());
cache.Flush();
uiInterface.ShowProgress("", 100, 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 CChainState::UnloadBlockIndex() {
nBlockSequenceId = 1;
setBlockIndexCandidates.clear();
// Do not point to CBlockIndex that will be free'd
m_finalizedBlockIndex = nullptr;
}
// 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);
g_chainman.Unload();
pindexBestInvalid = nullptr;
pindexBestParked = nullptr;
pindexBestHeader = nullptr;
pindexBestForkTip = nullptr;
pindexBestForkBase = nullptr;
ResetASERTAnchorBlockCache();
g_mempool.clear();
vinfoBlockFile.clear();
nLastBlockFile = 0;
setDirtyBlockIndex.clear();
setDirtyFileInfo.clear();
fHavePruned = false;
}
bool ChainstateManager::LoadBlockIndex(const Consensus::Params &params) {
AssertLockHeld(cs_main);
// Load block index from databases
bool needs_init = fReindex;
if (!fReindex) {
bool ret = LoadBlockIndexDB(*this, params);
if (!ret) {
return false;
}
needs_init = m_blockman.m_block_index.empty();
}
if (needs_init) {
// Everything here is for *new* reindex/DBs. Thus, though
// LoadBlockIndexDB may have set fReindex if we shut down
// mid-reindex previously, we don't check fReindex and
// instead only check it prior to LoadBlockIndexDB to set
// needs_init.
LogPrintf("Initializing databases...\n");
}
return true;
}
bool CChainState::LoadGenesisBlock(const CChainParams &chainparams) {
LOCK(cs_main);
// Check whether we're already initialized by checking for genesis in
// m_blockman.m_block_index. Note that we can't use m_chain here, since it
// is set based on the coins db, not the block index db, which is the only
// thing loaded at this point.
if (m_blockman.m_block_index.count(chainparams.GenesisBlock().GetHash())) {
return true;
}
try {
const CBlock &block = chainparams.GenesisBlock();
FlatFilePos blockPos = SaveBlockToDisk(block, 0, chainparams, nullptr);
if (blockPos.IsNull()) {
return error("%s: writing genesis block to disk failed", __func__);
}
CBlockIndex *pindex = m_blockman.AddToBlockIndex(block);
ReceivedBlockTransactions(block, pindex, blockPos);
} catch (const std::runtime_error &e) {
return error("%s: failed to write genesis block: %s", __func__,
e.what());
}
return true;
}
bool LoadGenesisBlock(const CChainParams &chainparams) {
return ::ChainstateActive().LoadGenesisBlock(chainparams);
}
void LoadExternalBlockFile(const Config &config, FILE *fileIn,
FlatFilePos *dbp) {
// Map of disk positions for blocks with unknown parent (only used for
// reindex)
static std::multimap<uint256, FlatFilePos> 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()) {
if (ShutdownRequested()) {
return;
}
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 >> buf;
if (memcmp(buf, chainparams.DiskMagic().data(),
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<CBlock> pblock = std::make_shared<CBlock>();
CBlock &block = *pblock;
blkdat >> block;
nRewind = blkdat.GetPos();
const BlockHash hash = block.GetHash();
{
LOCK(cs_main);
// detect out of order blocks, and store them for later
if (hash != chainparams.GetConsensus().hashGenesisBlock &&
!LookupBlockIndex(block.hashPrevBlock)) {
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
CBlockIndex *pindex = LookupBlockIndex(hash);
if (!pindex || !pindex->nStatus.hasData()) {
BlockValidationState state;
if (::ChainstateActive().AcceptBlock(
config, pblock, state, true, dbp, nullptr)) {
nLoaded++;
}
if (state.IsError()) {
break;
}
} else if (hash != chainparams.GetConsensus()
.hashGenesisBlock &&
pindex->nHeight % 1000 == 0) {
LogPrint(
BCLog::REINDEX,
"Block Import: already had block %s at height %d\n",
hash.ToString(), pindex->nHeight);
}
}
// Activate the genesis block so normal node progress can
// continue
if (hash == chainparams.GetConsensus().hashGenesisBlock) {
BlockValidationState state;
if (!ActivateBestChain(config, state, nullptr)) {
break;
}
}
NotifyHeaderTip();
// Recursively process earlier encountered successors of this
// block
std::deque<uint256> queue;
queue.push_back(hash);
while (!queue.empty()) {
uint256 head = queue.front();
queue.pop_front();
std::pair<std::multimap<uint256, FlatFilePos>::iterator,
std::multimap<uint256, FlatFilePos>::iterator>
range = mapBlocksUnknownParent.equal_range(head);
while (range.first != range.second) {
std::multimap<uint256, FlatFilePos>::iterator it =
range.first;
std::shared_ptr<CBlock> pblockrecursive =
std::make_shared<CBlock>();
if (ReadBlockFromDisk(*pblockrecursive, it->second,
chainparams.GetConsensus())) {
LogPrint(
BCLog::REINDEX,
"%s: Processing out of order child %s of %s\n",
__func__, pblockrecursive->GetHash().ToString(),
head.ToString());
LOCK(cs_main);
BlockValidationState dummy;
if (::ChainstateActive().AcceptBlock(
config, pblockrecursive, dummy, 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());
}
LogPrintf("Loaded %i blocks from external file in %dms\n", nLoaded,
GetTimeMillis() - nStart);
}
void CChainState::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
// m_blockman.m_block_index but no active chain. (A few of the tests when
// iterating the block tree require that m_chain has been initialized.)
if (m_chain.Height() < 0) {
assert(m_blockman.m_block_index.size() <= 1);
return;
}
// Build forward-pointing map of the entire block tree.
std::multimap<CBlockIndex *, CBlockIndex *> forward;
for (const auto &entry : m_blockman.m_block_index) {
forward.emplace(entry.second->pprev, entry.second);
}
assert(forward.size() == m_blockman.m_block_index.size());
std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
std::multimap<CBlockIndex *, CBlockIndex *>::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 is parked.
CBlockIndex *pindexFirstParked = nullptr;
// Oldest ancestor of pindex which does not have data available.
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.hasFailed()) {
pindexFirstInvalid = pindex;
}
if (pindexFirstParked == nullptr && pindex->nStatus.isParked()) {
pindexFirstParked = pindex;
}
if (pindexFirstMissing == nullptr && !pindex->nStatus.hasData()) {
pindexFirstMissing = pindex;
}
if (pindexFirstNeverProcessed == nullptr && pindex->nTx == 0) {
pindexFirstNeverProcessed = pindex;
}
if (pindex->pprev != nullptr && pindexFirstNotTreeValid == nullptr &&
pindex->nStatus.getValidity() < BlockValidity::TREE) {
pindexFirstNotTreeValid = pindex;
}
if (pindex->pprev != nullptr &&
pindexFirstNotTransactionsValid == nullptr &&
pindex->nStatus.getValidity() < BlockValidity::TRANSACTIONS) {
pindexFirstNotTransactionsValid = pindex;
}
if (pindex->pprev != nullptr && pindexFirstNotChainValid == nullptr &&
pindex->nStatus.getValidity() < BlockValidity::CHAIN) {
pindexFirstNotChainValid = pindex;
}
if (pindex->pprev != nullptr && pindexFirstNotScriptsValid == nullptr &&
pindex->nStatus.getValidity() < BlockValidity::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 == m_chain.Genesis());
}
if (!pindex->HaveTxsDownloaded()) {
// 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.hasData() == (pindex->nTx > 0));
assert(pindexFirstMissing == pindexFirstNeverProcessed);
} else if (pindex->nStatus.hasData()) {
// If we have pruned, then we can only say that HAVE_DATA implies
// nTx > 0
assert(pindex->nTx > 0);
}
if (pindex->nStatus.hasUndo()) {
assert(pindex->nStatus.hasData());
}
// This is pruning-independent.
assert((pindex->nStatus.getValidity() >= BlockValidity::TRANSACTIONS) ==
(pindex->nTx > 0));
// All parents having had data (at some point) is equivalent to all
// parents being VALID_TRANSACTIONS, which is equivalent to
// HaveTxsDownloaded(). All parents having had data (at some point) is
// equivalent to all parents being VALID_TRANSACTIONS, which is
// equivalent to HaveTxsDownloaded().
assert((pindexFirstNeverProcessed == nullptr) ==
(pindex->HaveTxsDownloaded()));
assert((pindexFirstNotTransactionsValid == nullptr) ==
(pindex->HaveTxsDownloaded()));
// 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 m_blockman.m_block_index entries must at least be TREE valid
assert(pindexFirstNotTreeValid == nullptr);
if (pindex->nStatus.getValidity() >= BlockValidity::TREE) {
// TREE valid implies all parents are TREE valid
assert(pindexFirstNotTreeValid == nullptr);
}
if (pindex->nStatus.getValidity() >= BlockValidity::CHAIN) {
// CHAIN valid implies all parents are CHAIN valid
assert(pindexFirstNotChainValid == nullptr);
}
if (pindex->nStatus.getValidity() >= BlockValidity::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.isInvalid());
}
if (pindexFirstParked == nullptr) {
// Checks for not-parked blocks.
// The parked mask cannot be set for blocks without parked parents.
// (i.e., hasParkedParent only if an ancestor is properly parked).
assert(!pindex->nStatus.isOnParkedChain());
}
if (!CBlockIndexWorkComparator()(pindex, m_chain.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 or be parked.
if (pindexFirstMissing == nullptr) {
assert(pindex->nStatus.isOnParkedChain() ||
setBlockIndexCandidates.count(pindex));
}
// m_chain.Tip() must also be there even if some data has
// been pruned.
if (pindex == m_chain.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
// m_blocks_unlinked -- 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 m_blocks_unlinked.
std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
std::multimap<CBlockIndex *, CBlockIndex *>::iterator>
rangeUnlinked =
m_blockman.m_blocks_unlinked.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.hasData() &&
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
// m_blocks_unlinked.
assert(foundInUnlinked);
}
if (!pindex->nStatus.hasData()) {
// Can't be in m_blocks_unlinked if we don't HAVE_DATA
assert(!foundInUnlinked);
}
if (pindexFirstMissing == nullptr) {
// We aren't missing data for any parent -- cannot be in
// m_blocks_unlinked.
assert(!foundInUnlinked);
}
if (pindex->pprev && pindex->nStatus.hasData() &&
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 m_blocks_unlinked 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 m_chain and the
// tip.
// So if this block is itself better than m_chain.Tip() and it
// wasn't in
// setBlockIndexCandidates, then it must be in m_blocks_unlinked.
if (!CBlockIndexWorkComparator()(pindex, m_chain.Tip()) &&
setBlockIndexCandidates.count(pindex) == 0) {
if (pindexFirstInvalid == nullptr) {
assert(foundInUnlinked);
}
}
}
// Perhaps too slow
// assert(pindex->GetBlockHash() == pindex->GetBlockHeader().GetHash());
// End: actual consistency checks.
// Try descending into the first subnode.
std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
std::multimap<CBlockIndex *, CBlockIndex *>::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 == pindexFirstParked) {
pindexFirstParked = 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<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
std::multimap<CBlockIndex *, CBlockIndex *>::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 CChainState::ToString() {
CBlockIndex *tip = m_chain.Tip();
return strprintf("Chainstate [%s] @ height %d (%s)",
m_from_snapshot_blockhash.IsNull() ? "ibd" : "snapshot",
tip ? tip->nHeight : -1,
tip ? tip->GetBlockHash().ToString() : "null");
}
bool CChainState::ResizeCoinsCaches(size_t coinstip_size, size_t coinsdb_size) {
if (coinstip_size == m_coinstip_cache_size_bytes &&
coinsdb_size == m_coinsdb_cache_size_bytes) {
// Cache sizes are unchanged, no need to continue.
return true;
}
size_t old_coinstip_size = m_coinstip_cache_size_bytes;
m_coinstip_cache_size_bytes = coinstip_size;
m_coinsdb_cache_size_bytes = coinsdb_size;
CoinsDB().ResizeCache(coinsdb_size);
LogPrintf("[%s] resized coinsdb cache to %.1f MiB\n", this->ToString(),
coinsdb_size * (1.0 / 1024 / 1024));
LogPrintf("[%s] resized coinstip cache to %.1f MiB\n", this->ToString(),
coinstip_size * (1.0 / 1024 / 1024));
BlockValidationState state;
const CChainParams &chainparams = Params();
bool ret;
if (coinstip_size > old_coinstip_size) {
// Likely no need to flush if cache sizes have grown.
ret = FlushStateToDisk(chainparams, state, FlushStateMode::IF_NEEDED);
} else {
// Otherwise, flush state to disk and deallocate the in-memory coins
// map.
ret = FlushStateToDisk(chainparams, state, FlushStateMode::ALWAYS);
CoinsTip().ReallocateCache();
}
return ret;
}
std::string CBlockFileInfo::ToString() const {
return strprintf(
"CBlockFileInfo(blocks=%u, size=%u, heights=%u...%u, time=%s...%s)",
nBlocks, nSize, nHeightFirst, nHeightLast,
FormatISO8601DateTime(nTimeFirst), FormatISO8601DateTime(nTimeLast));
}
CBlockFileInfo *GetBlockFileInfo(size_t n) {
LOCK(cs_LastBlockFile);
return &vinfoBlockFile.at(n);
}
static ThresholdState VersionBitsStateImpl(const Consensus::Params &params,
Consensus::DeploymentPos pos,
const CBlockIndex *pindex)
EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
return VersionBitsState(pindex, params, pos, versionbitscache);
}
ThresholdState VersionBitsTipState(const Consensus::Params &params,
Consensus::DeploymentPos pos) {
LOCK(cs_main);
return VersionBitsStateImpl(params, pos, ::ChainActive().Tip());
}
ThresholdState VersionBitsBlockState(const Consensus::Params &params,
Consensus::DeploymentPos pos,
const CBlockIndex *pindex) {
LOCK(cs_main);
return VersionBitsStateImpl(params, pos, pindex);
}
BIP9Stats VersionBitsTipStatistics(const Consensus::Params &params,
Consensus::DeploymentPos pos) {
LOCK(cs_main);
return VersionBitsStatistics(::ChainActive().Tip(), params, pos);
}
int VersionBitsTipStateSinceHeight(const Consensus::Params &params,
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, CTxMemPool &pool) {
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 expired = 0;
int64_t failed = 0;
int64_t already_there = 0;
int64_t unbroadcast = 0;
int64_t nNow = GetTime();
try {
uint64_t version;
file >> version;
if (version != MEMPOOL_DUMP_VERSION) {
return false;
}
uint64_t num;
file >> num;
while (num--) {
CTransactionRef tx;
int64_t nTime;
int64_t nFeeDelta;
file >> tx;
file >> nTime;
file >> nFeeDelta;
Amount amountdelta = nFeeDelta * SATOSHI;
if (amountdelta != Amount::zero()) {
pool.PrioritiseTransaction(tx->GetId(), amountdelta);
}
TxValidationState state;
if (nTime + nExpiryTimeout > nNow) {
LOCK(cs_main);
AcceptToMemoryPoolWithTime(
config, pool, state, tx, nTime, false /* bypass_limits */,
Amount::zero() /* nAbsurdFee */, false /* test_accept */);
if (state.IsValid()) {
++count;
} else {
// mempool may contain the transaction already, e.g. from
// wallet(s) having loaded it while we were processing
// mempool transactions; consider these as valid, instead of
// failed, but mark them as 'already there'
if (pool.exists(tx->GetId())) {
++already_there;
} else {
++failed;
}
}
} else {
++expired;
}
if (ShutdownRequested()) {
return false;
}
}
std::map<TxId, Amount> mapDeltas;
file >> mapDeltas;
for (const auto &i : mapDeltas) {
pool.PrioritiseTransaction(i.first, i.second);
}
// TODO: remove this try...catch after May 15th 2021,
// when no one is running v0.22.11 or lower anymore.
// This will be done by backporting PR20854.
try {
std::set<TxId> unbroadcast_txids;
file >> unbroadcast_txids;
unbroadcast = unbroadcast_txids.size();
for (const auto &txid : unbroadcast_txids) {
pool.AddUnbroadcastTx(txid);
}
} catch (const std::exception &) {
// mempool.dat files created prior to v0.22.12 will not have an
// unbroadcast set. No need to log a failure if parsing fails here.
}
} 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 succeeded, %i "
"failed, %i expired, %i already there, %i waiting for initial "
"broadcast\n",
count, failed, expired, already_there, unbroadcast);
return true;
}
bool DumpMempool(const CTxMemPool &pool) {
int64_t start = GetTimeMicros();
std::map<uint256, Amount> mapDeltas;
std::vector<TxMempoolInfo> vinfo;
std::set<TxId> unbroadcast_txids;
static Mutex dump_mutex;
LOCK(dump_mutex);
{
LOCK(pool.cs);
for (const auto &i : pool.mapDeltas) {
mapDeltas[i.first] = i.second;
}
vinfo = pool.infoAll();
unbroadcast_txids = pool.GetUnbroadcastTxs();
}
int64_t mid = GetTimeMicros();
try {
FILE *filestr = fsbridge::fopen(GetDataDir() / "mempool.dat.new", "wb");
if (!filestr) {
return false;
}
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(count_seconds(i.m_time));
file << i.nFeeDelta;
mapDeltas.erase(i.tx->GetId());
}
file << mapDeltas;
LogPrintf("Writing %d unbroadcast transactions to disk.\n",
unbroadcast_txids.size());
file << unbroadcast_txids;
if (!FileCommit(file.Get())) {
throw std::runtime_error("FileCommit failed");
}
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) * MICRO, (last - mid) * MICRO);
} catch (const std::exception &e) {
LogPrintf("Failed to dump mempool: %s. Continuing anyway.\n", e.what());
return false;
}
return true;
}
bool IsBlockPruned(const CBlockIndex *pblockindex) {
return (fHavePruned && !pblockindex->nStatus.hasData() &&
pblockindex->nTx > 0);
}
//! Guess how far we are in the verification process at the given block index
//! require cs_main if pindex has not been validated yet (because the chain's
//! transaction count might be unset) This conditional lock requirement might be
//! confusing, see: https://github.com/bitcoin/bitcoin/issues/15994
double GuessVerificationProgress(const ChainTxData &data,
const CBlockIndex *pindex) {
if (pindex == nullptr) {
return 0.0;
}
int64_t nNow = time(nullptr);
double fTxTotal;
if (pindex->GetChainTxCount() <= data.nTxCount) {
fTxTotal = data.nTxCount + (nNow - data.nTime) * data.dTxRate;
} else {
fTxTotal = pindex->GetChainTxCount() +
(nNow - pindex->GetBlockTime()) * data.dTxRate;
}
return std::min<double>(pindex->GetChainTxCount() / fTxTotal, 1.0);
}
class CMainCleanup {
public:
CMainCleanup() {}
~CMainCleanup() {
// block headers
for (const std::pair<const BlockHash, CBlockIndex *> &it :
g_chainman.BlockIndex()) {
delete it.second;
}
g_chainman.BlockIndex().clear();
}
};
static CMainCleanup instance_of_cmaincleanup;
std::optional<BlockHash> ChainstateManager::SnapshotBlockhash() const {
if (m_active_chainstate != nullptr) {
// If a snapshot chainstate exists, it will always be our active.
return m_active_chainstate->m_from_snapshot_blockhash;
}
return {};
}
std::vector<CChainState *> ChainstateManager::GetAll() {
std::vector<CChainState *> out;
if (!IsSnapshotValidated() && m_ibd_chainstate) {
out.push_back(m_ibd_chainstate.get());
}
if (m_snapshot_chainstate) {
out.push_back(m_snapshot_chainstate.get());
}
return out;
}
CChainState &
ChainstateManager::InitializeChainstate(const BlockHash &snapshot_blockhash) {
bool is_snapshot = !snapshot_blockhash.IsNull();
std::unique_ptr<CChainState> &to_modify =
is_snapshot ? m_snapshot_chainstate : m_ibd_chainstate;
if (to_modify) {
throw std::logic_error("should not be overwriting a chainstate");
}
to_modify.reset(new CChainState(m_blockman, snapshot_blockhash));
// Snapshot chainstates and initial IBD chaintates always become active.
if (is_snapshot || (!is_snapshot && !m_active_chainstate)) {
LogPrintf("Switching active chainstate to %s\n", to_modify->ToString());
m_active_chainstate = to_modify.get();
} else {
throw std::logic_error("unexpected chainstate activation");
}
return *to_modify;
}
CChain &ChainstateManager::ActiveChain() const {
assert(m_active_chainstate);
return m_active_chainstate->m_chain;
}
bool ChainstateManager::IsSnapshotActive() const {
return m_snapshot_chainstate &&
m_active_chainstate == m_snapshot_chainstate.get();
}
CChainState &ChainstateManager::ValidatedChainstate() const {
if (m_snapshot_chainstate && IsSnapshotValidated()) {
return *m_snapshot_chainstate.get();
}
assert(m_ibd_chainstate);
return *m_ibd_chainstate.get();
}
bool ChainstateManager::IsBackgroundIBD(CChainState *chainstate) const {
return (m_snapshot_chainstate && chainstate == m_ibd_chainstate.get());
}
void ChainstateManager::Unload() {
for (CChainState *chainstate : this->GetAll()) {
chainstate->m_chain.SetTip(nullptr);
chainstate->UnloadBlockIndex();
}
m_blockman.Unload();
}
void ChainstateManager::Reset() {
m_ibd_chainstate.reset();
m_snapshot_chainstate.reset();
m_active_chainstate = nullptr;
m_snapshot_validated = false;
}
void ChainstateManager::MaybeRebalanceCaches() {
if (m_ibd_chainstate && !m_snapshot_chainstate) {
LogPrintf("[snapshot] allocating all cache to the IBD chainstate\n");
// Allocate everything to the IBD chainstate.
m_ibd_chainstate->ResizeCoinsCaches(m_total_coinstip_cache,
m_total_coinsdb_cache);
} else if (m_snapshot_chainstate && !m_ibd_chainstate) {
LogPrintf(
"[snapshot] allocating all cache to the snapshot chainstate\n");
// Allocate everything to the snapshot chainstate.
m_snapshot_chainstate->ResizeCoinsCaches(m_total_coinstip_cache,
m_total_coinsdb_cache);
} else if (m_ibd_chainstate && m_snapshot_chainstate) {
// If both chainstates exist, determine who needs more cache based on
// IBD status.
//
// Note: shrink caches first so that we don't inadvertently overwhelm
// available memory.
if (m_snapshot_chainstate->IsInitialBlockDownload()) {
m_ibd_chainstate->ResizeCoinsCaches(m_total_coinstip_cache * 0.05,
m_total_coinsdb_cache * 0.05);
m_snapshot_chainstate->ResizeCoinsCaches(
m_total_coinstip_cache * 0.95, m_total_coinsdb_cache * 0.95);
} else {
m_snapshot_chainstate->ResizeCoinsCaches(
m_total_coinstip_cache * 0.05, m_total_coinsdb_cache * 0.05);
m_ibd_chainstate->ResizeCoinsCaches(m_total_coinstip_cache * 0.95,
m_total_coinsdb_cache * 0.95);
}
}
}

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