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|
// Copyright (c) 2011-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <node/blockstorage.h>
#include <chain.h>
#include <clientversion.h>
#include <consensus/validation.h>
#include <dbwrapper.h>
#include <flatfile.h>
#include <hash.h>
#include <kernel/chain.h>
#include <kernel/chainparams.h>
#include <kernel/messagestartchars.h>
#include <logging.h>
#include <pow.h>
#include <reverse_iterator.h>
#include <signet.h>
#include <streams.h>
#include <sync.h>
#include <undo.h>
#include <util/batchpriority.h>
#include <util/fs.h>
#include <util/signalinterrupt.h>
#include <util/strencodings.h>
#include <util/translation.h>
#include <validation.h>
#include <map>
#include <unordered_map>
namespace kernel {
static constexpr uint8_t DB_BLOCK_FILES{'f'};
static constexpr uint8_t DB_BLOCK_INDEX{'b'};
static constexpr uint8_t DB_FLAG{'F'};
static constexpr uint8_t DB_REINDEX_FLAG{'R'};
static constexpr uint8_t DB_LAST_BLOCK{'l'};
// Keys used in previous version that might still be found in the DB:
// BlockTreeDB::DB_TXINDEX_BLOCK{'T'};
// BlockTreeDB::DB_TXINDEX{'t'}
// BlockTreeDB::ReadFlag("txindex")
bool BlockTreeDB::ReadBlockFileInfo(int nFile, CBlockFileInfo& info)
{
return Read(std::make_pair(DB_BLOCK_FILES, nFile), info);
}
bool BlockTreeDB::WriteReindexing(bool fReindexing)
{
if (fReindexing) {
return Write(DB_REINDEX_FLAG, uint8_t{'1'});
} else {
return Erase(DB_REINDEX_FLAG);
}
}
void BlockTreeDB::ReadReindexing(bool& fReindexing)
{
fReindexing = Exists(DB_REINDEX_FLAG);
}
bool BlockTreeDB::ReadLastBlockFile(int& nFile)
{
return Read(DB_LAST_BLOCK, nFile);
}
bool BlockTreeDB::WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*>>& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo)
{
CDBBatch batch(*this);
for (const auto& [file, info] : fileInfo) {
batch.Write(std::make_pair(DB_BLOCK_FILES, file), *info);
}
batch.Write(DB_LAST_BLOCK, nLastFile);
for (const CBlockIndex* bi : blockinfo) {
batch.Write(std::make_pair(DB_BLOCK_INDEX, bi->GetBlockHash()), CDiskBlockIndex{bi});
}
return WriteBatch(batch, true);
}
bool BlockTreeDB::WriteFlag(const std::string& name, bool fValue)
{
return Write(std::make_pair(DB_FLAG, name), fValue ? uint8_t{'1'} : uint8_t{'0'});
}
bool BlockTreeDB::ReadFlag(const std::string& name, bool& fValue)
{
uint8_t ch;
if (!Read(std::make_pair(DB_FLAG, name), ch)) {
return false;
}
fValue = ch == uint8_t{'1'};
return true;
}
bool BlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex, const util::SignalInterrupt& interrupt)
{
AssertLockHeld(::cs_main);
std::unique_ptr<CDBIterator> pcursor(NewIterator());
pcursor->Seek(std::make_pair(DB_BLOCK_INDEX, uint256()));
// Load m_block_index
while (pcursor->Valid()) {
if (interrupt) return false;
std::pair<uint8_t, uint256> key;
if (pcursor->GetKey(key) && key.first == DB_BLOCK_INDEX) {
CDiskBlockIndex diskindex;
if (pcursor->GetValue(diskindex)) {
// Construct block index object
CBlockIndex* pindexNew = insertBlockIndex(diskindex.ConstructBlockHash());
pindexNew->pprev = insertBlockIndex(diskindex.hashPrev);
pindexNew->nHeight = diskindex.nHeight;
pindexNew->nFile = diskindex.nFile;
pindexNew->nDataPos = diskindex.nDataPos;
pindexNew->nUndoPos = diskindex.nUndoPos;
pindexNew->nVersion = diskindex.nVersion;
pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
pindexNew->nTime = diskindex.nTime;
pindexNew->nBits = diskindex.nBits;
pindexNew->nNonce = diskindex.nNonce;
pindexNew->nStatus = diskindex.nStatus;
pindexNew->nTx = diskindex.nTx;
if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits, consensusParams)) {
return error("%s: CheckProofOfWork failed: %s", __func__, pindexNew->ToString());
}
pcursor->Next();
} else {
return error("%s: failed to read value", __func__);
}
} else {
break;
}
}
return true;
}
} // namespace kernel
namespace node {
std::atomic_bool fReindex(false);
bool CBlockIndexWorkComparator::operator()(const CBlockIndex* pa, const CBlockIndex* pb) const
{
// First sort by most total work, ...
if (pa->nChainWork > pb->nChainWork) return false;
if (pa->nChainWork < pb->nChainWork) return true;
// ... then by earliest time received, ...
if (pa->nSequenceId < pb->nSequenceId) return false;
if (pa->nSequenceId > pb->nSequenceId) return true;
// Use pointer address as tie breaker (should only happen with blocks
// loaded from disk, as those all have id 0).
if (pa < pb) return false;
if (pa > pb) return true;
// Identical blocks.
return false;
}
bool CBlockIndexHeightOnlyComparator::operator()(const CBlockIndex* pa, const CBlockIndex* pb) const
{
return pa->nHeight < pb->nHeight;
}
std::vector<CBlockIndex*> BlockManager::GetAllBlockIndices()
{
AssertLockHeld(cs_main);
std::vector<CBlockIndex*> rv;
rv.reserve(m_block_index.size());
for (auto& [_, block_index] : m_block_index) {
rv.push_back(&block_index);
}
return rv;
}
CBlockIndex* BlockManager::LookupBlockIndex(const uint256& hash)
{
AssertLockHeld(cs_main);
BlockMap::iterator it = m_block_index.find(hash);
return it == m_block_index.end() ? nullptr : &it->second;
}
const CBlockIndex* BlockManager::LookupBlockIndex(const uint256& hash) const
{
AssertLockHeld(cs_main);
BlockMap::const_iterator it = m_block_index.find(hash);
return it == m_block_index.end() ? nullptr : &it->second;
}
CBlockIndex* BlockManager::AddToBlockIndex(const CBlockHeader& block, CBlockIndex*& best_header)
{
AssertLockHeld(cs_main);
auto [mi, inserted] = m_block_index.try_emplace(block.GetHash(), block);
if (!inserted) {
return &mi->second;
}
CBlockIndex* pindexNew = &(*mi).second;
// 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;
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->nTimeMax = (pindexNew->pprev ? std::max(pindexNew->pprev->nTimeMax, pindexNew->nTime) : pindexNew->nTime);
pindexNew->nChainWork = (pindexNew->pprev ? pindexNew->pprev->nChainWork : 0) + GetBlockProof(*pindexNew);
pindexNew->RaiseValidity(BLOCK_VALID_TREE);
if (best_header == nullptr || best_header->nChainWork < pindexNew->nChainWork) {
best_header = pindexNew;
}
m_dirty_blockindex.insert(pindexNew);
return pindexNew;
}
void BlockManager::PruneOneBlockFile(const int fileNumber)
{
AssertLockHeld(cs_main);
LOCK(cs_LastBlockFile);
for (auto& entry : m_block_index) {
CBlockIndex* pindex = &entry.second;
if (pindex->nFile == fileNumber) {
pindex->nStatus &= ~BLOCK_HAVE_DATA;
pindex->nStatus &= ~BLOCK_HAVE_UNDO;
pindex->nFile = 0;
pindex->nDataPos = 0;
pindex->nUndoPos = 0;
m_dirty_blockindex.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_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_blocks_unlinked.erase(_it);
}
}
}
}
m_blockfile_info.at(fileNumber) = CBlockFileInfo{};
m_dirty_fileinfo.insert(fileNumber);
}
void BlockManager::FindFilesToPruneManual(
std::set<int>& setFilesToPrune,
int nManualPruneHeight,
const Chainstate& chain,
ChainstateManager& chainman)
{
assert(IsPruneMode() && nManualPruneHeight > 0);
LOCK2(cs_main, cs_LastBlockFile);
if (chain.m_chain.Height() < 0) {
return;
}
const auto [min_block_to_prune, last_block_can_prune] = chainman.GetPruneRange(chain, nManualPruneHeight);
int count = 0;
for (int fileNumber = 0; fileNumber < this->MaxBlockfileNum(); fileNumber++) {
const auto& fileinfo = m_blockfile_info[fileNumber];
if (fileinfo.nSize == 0 || fileinfo.nHeightLast > (unsigned)last_block_can_prune || fileinfo.nHeightFirst < (unsigned)min_block_to_prune) {
continue;
}
PruneOneBlockFile(fileNumber);
setFilesToPrune.insert(fileNumber);
count++;
}
LogPrintf("[%s] Prune (Manual): prune_height=%d removed %d blk/rev pairs\n",
chain.GetRole(), last_block_can_prune, count);
}
void BlockManager::FindFilesToPrune(
std::set<int>& setFilesToPrune,
int last_prune,
const Chainstate& chain,
ChainstateManager& chainman)
{
LOCK2(cs_main, cs_LastBlockFile);
// Distribute our -prune budget over all chainstates.
const auto target = std::max(
MIN_DISK_SPACE_FOR_BLOCK_FILES, GetPruneTarget() / chainman.GetAll().size());
if (chain.m_chain.Height() < 0 || target == 0) {
return;
}
if (static_cast<uint64_t>(chain.m_chain.Height()) <= chainman.GetParams().PruneAfterHeight()) {
return;
}
const auto [min_block_to_prune, last_block_can_prune] = chainman.GetPruneRange(chain, last_prune);
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 >= target) {
// 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 (chainman.IsInitialBlockDownload()) {
// Since this is only relevant during IBD, we use a fixed 10%
nBuffer += target / 10;
}
for (int fileNumber = 0; fileNumber < this->MaxBlockfileNum(); fileNumber++) {
const auto& fileinfo = m_blockfile_info[fileNumber];
nBytesToPrune = fileinfo.nSize + fileinfo.nUndoSize;
if (fileinfo.nSize == 0) {
continue;
}
if (nCurrentUsage + nBuffer < target) { // are we below our target?
break;
}
// don't prune files that could have a block that's not within the allowable
// prune range for the chain being pruned.
if (fileinfo.nHeightLast > (unsigned)last_block_can_prune || fileinfo.nHeightFirst < (unsigned)min_block_to_prune) {
continue;
}
PruneOneBlockFile(fileNumber);
// Queue up the files for removal
setFilesToPrune.insert(fileNumber);
nCurrentUsage -= nBytesToPrune;
count++;
}
}
LogPrint(BCLog::PRUNE, "[%s] target=%dMiB actual=%dMiB diff=%dMiB min_height=%d max_prune_height=%d removed %d blk/rev pairs\n",
chain.GetRole(), target / 1024 / 1024, nCurrentUsage / 1024 / 1024,
(int64_t(target) - int64_t(nCurrentUsage)) / 1024 / 1024,
min_block_to_prune, last_block_can_prune, count);
}
void BlockManager::UpdatePruneLock(const std::string& name, const PruneLockInfo& lock_info) {
AssertLockHeld(::cs_main);
m_prune_locks[name] = lock_info;
}
CBlockIndex* BlockManager::InsertBlockIndex(const uint256& hash)
{
AssertLockHeld(cs_main);
if (hash.IsNull()) {
return nullptr;
}
const auto [mi, inserted]{m_block_index.try_emplace(hash)};
CBlockIndex* pindex = &(*mi).second;
if (inserted) {
pindex->phashBlock = &((*mi).first);
}
return pindex;
}
bool BlockManager::LoadBlockIndex(const std::optional<uint256>& snapshot_blockhash)
{
if (!m_block_tree_db->LoadBlockIndexGuts(
GetConsensus(), [this](const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return this->InsertBlockIndex(hash); }, m_interrupt)) {
return false;
}
if (snapshot_blockhash) {
const std::optional<AssumeutxoData> maybe_au_data = GetParams().AssumeutxoForBlockhash(*snapshot_blockhash);
if (!maybe_au_data) {
m_opts.notifications.fatalError(strprintf("Assumeutxo data not found for the given blockhash '%s'.", snapshot_blockhash->ToString()));
return false;
}
const AssumeutxoData& au_data = *Assert(maybe_au_data);
m_snapshot_height = au_data.height;
CBlockIndex* base{LookupBlockIndex(*snapshot_blockhash)};
// Since nChainTx (responsible for estimated progress) isn't persisted
// to disk, we must bootstrap the value for assumedvalid chainstates
// from the hardcoded assumeutxo chainparams.
base->nChainTx = au_data.nChainTx;
LogPrintf("[snapshot] set nChainTx=%d for %s\n", au_data.nChainTx, snapshot_blockhash->ToString());
} else {
// If this isn't called with a snapshot blockhash, make sure the cached snapshot height
// is null. This is relevant during snapshot completion, when the blockman may be loaded
// with a height that then needs to be cleared after the snapshot is fully validated.
m_snapshot_height.reset();
}
Assert(m_snapshot_height.has_value() == snapshot_blockhash.has_value());
// Calculate nChainWork
std::vector<CBlockIndex*> vSortedByHeight{GetAllBlockIndices()};
std::sort(vSortedByHeight.begin(), vSortedByHeight.end(),
CBlockIndexHeightOnlyComparator());
CBlockIndex* previous_index{nullptr};
for (CBlockIndex* pindex : vSortedByHeight) {
if (m_interrupt) return false;
if (previous_index && pindex->nHeight > previous_index->nHeight + 1) {
return error("%s: block index is non-contiguous, index of height %d missing", __func__, previous_index->nHeight + 1);
}
previous_index = pindex;
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, or
// blocks that are assumed-valid on the basis of snapshot load (see
// PopulateAndValidateSnapshot()).
// Pruned nodes may have deleted the block.
if (pindex->nTx > 0) {
if (pindex->pprev) {
if (m_snapshot_height && pindex->nHeight == *m_snapshot_height &&
pindex->GetBlockHash() == *snapshot_blockhash) {
// Should have been set above; don't disturb it with code below.
Assert(pindex->nChainTx > 0);
} else if (pindex->pprev->nChainTx > 0) {
pindex->nChainTx = pindex->pprev->nChainTx + pindex->nTx;
} else {
pindex->nChainTx = 0;
m_blocks_unlinked.insert(std::make_pair(pindex->pprev, pindex));
}
} else {
pindex->nChainTx = pindex->nTx;
}
}
if (!(pindex->nStatus & BLOCK_FAILED_MASK) && pindex->pprev && (pindex->pprev->nStatus & BLOCK_FAILED_MASK)) {
pindex->nStatus |= BLOCK_FAILED_CHILD;
m_dirty_blockindex.insert(pindex);
}
if (pindex->pprev) {
pindex->BuildSkip();
}
}
return true;
}
bool BlockManager::WriteBlockIndexDB()
{
AssertLockHeld(::cs_main);
std::vector<std::pair<int, const CBlockFileInfo*>> vFiles;
vFiles.reserve(m_dirty_fileinfo.size());
for (std::set<int>::iterator it = m_dirty_fileinfo.begin(); it != m_dirty_fileinfo.end();) {
vFiles.emplace_back(*it, &m_blockfile_info[*it]);
m_dirty_fileinfo.erase(it++);
}
std::vector<const CBlockIndex*> vBlocks;
vBlocks.reserve(m_dirty_blockindex.size());
for (std::set<CBlockIndex*>::iterator it = m_dirty_blockindex.begin(); it != m_dirty_blockindex.end();) {
vBlocks.push_back(*it);
m_dirty_blockindex.erase(it++);
}
int max_blockfile = WITH_LOCK(cs_LastBlockFile, return this->MaxBlockfileNum());
if (!m_block_tree_db->WriteBatchSync(vFiles, max_blockfile, vBlocks)) {
return false;
}
return true;
}
bool BlockManager::LoadBlockIndexDB(const std::optional<uint256>& snapshot_blockhash)
{
if (!LoadBlockIndex(snapshot_blockhash)) {
return false;
}
int max_blockfile_num{0};
// Load block file info
m_block_tree_db->ReadLastBlockFile(max_blockfile_num);
m_blockfile_info.resize(max_blockfile_num + 1);
LogPrintf("%s: last block file = %i\n", __func__, max_blockfile_num);
for (int nFile = 0; nFile <= max_blockfile_num; nFile++) {
m_block_tree_db->ReadBlockFileInfo(nFile, m_blockfile_info[nFile]);
}
LogPrintf("%s: last block file info: %s\n", __func__, m_blockfile_info[max_blockfile_num].ToString());
for (int nFile = max_blockfile_num + 1; true; nFile++) {
CBlockFileInfo info;
if (m_block_tree_db->ReadBlockFileInfo(nFile, info)) {
m_blockfile_info.push_back(info);
} else {
break;
}
}
// Check presence of blk files
LogPrintf("Checking all blk files are present...\n");
std::set<int> setBlkDataFiles;
for (const auto& [_, block_index] : m_block_index) {
if (block_index.nStatus & BLOCK_HAVE_DATA) {
setBlkDataFiles.insert(block_index.nFile);
}
}
for (std::set<int>::iterator it = setBlkDataFiles.begin(); it != setBlkDataFiles.end(); it++) {
FlatFilePos pos(*it, 0);
if (OpenBlockFile(pos, true).IsNull()) {
return false;
}
}
{
// Initialize the blockfile cursors.
LOCK(cs_LastBlockFile);
for (size_t i = 0; i < m_blockfile_info.size(); ++i) {
const auto last_height_in_file = m_blockfile_info[i].nHeightLast;
m_blockfile_cursors[BlockfileTypeForHeight(last_height_in_file)] = {static_cast<int>(i), 0};
}
}
// Check whether we have ever pruned block & undo files
m_block_tree_db->ReadFlag("prunedblockfiles", m_have_pruned);
if (m_have_pruned) {
LogPrintf("LoadBlockIndexDB(): Block files have previously been pruned\n");
}
// Check whether we need to continue reindexing
bool fReindexing = false;
m_block_tree_db->ReadReindexing(fReindexing);
if (fReindexing) fReindex = true;
return true;
}
void BlockManager::ScanAndUnlinkAlreadyPrunedFiles()
{
AssertLockHeld(::cs_main);
int max_blockfile = WITH_LOCK(cs_LastBlockFile, return this->MaxBlockfileNum());
if (!m_have_pruned) {
return;
}
std::set<int> block_files_to_prune;
for (int file_number = 0; file_number < max_blockfile; file_number++) {
if (m_blockfile_info[file_number].nSize == 0) {
block_files_to_prune.insert(file_number);
}
}
UnlinkPrunedFiles(block_files_to_prune);
}
const CBlockIndex* BlockManager::GetLastCheckpoint(const CCheckpointData& data)
{
const MapCheckpoints& checkpoints = data.mapCheckpoints;
for (const MapCheckpoints::value_type& i : reverse_iterate(checkpoints)) {
const uint256& hash = i.second;
const CBlockIndex* pindex = LookupBlockIndex(hash);
if (pindex) {
return pindex;
}
}
return nullptr;
}
bool BlockManager::IsBlockPruned(const CBlockIndex* pblockindex)
{
AssertLockHeld(::cs_main);
return (m_have_pruned && !(pblockindex->nStatus & BLOCK_HAVE_DATA) && pblockindex->nTx > 0);
}
const CBlockIndex* BlockManager::GetFirstStoredBlock(const CBlockIndex& upper_block, const CBlockIndex* lower_block)
{
AssertLockHeld(::cs_main);
const CBlockIndex* last_block = &upper_block;
assert(last_block->nStatus & BLOCK_HAVE_DATA); // 'upper_block' must have data
while (last_block->pprev && (last_block->pprev->nStatus & BLOCK_HAVE_DATA)) {
if (lower_block) {
// Return if we reached the lower_block
if (last_block == lower_block) return lower_block;
// if range was surpassed, means that 'lower_block' is not part of the 'upper_block' chain
// and so far this is not allowed.
assert(last_block->nHeight >= lower_block->nHeight);
}
last_block = last_block->pprev;
}
assert(last_block != nullptr);
return last_block;
}
bool BlockManager::CheckBlockDataAvailability(const CBlockIndex& upper_block, const CBlockIndex& lower_block)
{
if (!(upper_block.nStatus & BLOCK_HAVE_DATA)) return false;
return GetFirstStoredBlock(upper_block, &lower_block) == &lower_block;
}
// If we're using -prune with -reindex, then delete block files that will be ignored by the
// reindex. Since reindexing works by starting at block file 0 and looping until a blockfile
// is missing, do the same here to delete any later block files after a gap. Also delete all
// rev files since they'll be rewritten by the reindex anyway. This ensures that m_blockfile_info
// is in sync with what's actually on disk by the time we start downloading, so that pruning
// works correctly.
void BlockManager::CleanupBlockRevFiles() const
{
std::map<std::string, fs::path> mapBlockFiles;
// Glob all blk?????.dat and rev?????.dat files from the blocks directory.
// Remove the rev files immediately and insert the blk file paths into an
// ordered map keyed by block file index.
LogPrintf("Removing unusable blk?????.dat and rev?????.dat files for -reindex with -prune\n");
for (fs::directory_iterator it(m_opts.blocks_dir); it != fs::directory_iterator(); it++) {
const std::string path = fs::PathToString(it->path().filename());
if (fs::is_regular_file(*it) &&
path.length() == 12 &&
path.substr(8,4) == ".dat")
{
if (path.substr(0, 3) == "blk") {
mapBlockFiles[path.substr(3, 5)] = it->path();
} else if (path.substr(0, 3) == "rev") {
remove(it->path());
}
}
}
// Remove all block files that aren't part of a contiguous set starting at
// zero by walking the ordered map (keys are block file indices) by
// keeping a separate counter. Once we hit a gap (or if 0 doesn't exist)
// start removing block files.
int nContigCounter = 0;
for (const std::pair<const std::string, fs::path>& item : mapBlockFiles) {
if (LocaleIndependentAtoi<int>(item.first) == nContigCounter) {
nContigCounter++;
continue;
}
remove(item.second);
}
}
CBlockFileInfo* BlockManager::GetBlockFileInfo(size_t n)
{
LOCK(cs_LastBlockFile);
return &m_blockfile_info.at(n);
}
bool BlockManager::UndoWriteToDisk(const CBlockUndo& blockundo, FlatFilePos& pos, const uint256& hashBlock) const
{
// Open history file to append
CAutoFile fileout{OpenUndoFile(pos)};
if (fileout.IsNull()) {
return error("%s: OpenUndoFile failed", __func__);
}
// Write index header
unsigned int nSize = GetSerializeSize(blockundo);
fileout << GetParams().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
HashWriter hasher{};
hasher << hashBlock;
hasher << blockundo;
fileout << hasher.GetHash();
return true;
}
bool BlockManager::UndoReadFromDisk(CBlockUndo& blockundo, const CBlockIndex& index) const
{
const FlatFilePos pos{WITH_LOCK(::cs_main, return index.GetUndoPos())};
if (pos.IsNull()) {
return error("%s: no undo data available", __func__);
}
// Open history file to read
CAutoFile filein{OpenUndoFile(pos, true)};
if (filein.IsNull()) {
return error("%s: OpenUndoFile failed", __func__);
}
// Read block
uint256 hashChecksum;
HashVerifier verifier{filein}; // Use HashVerifier as reserializing may lose data, c.f. commit d342424301013ec47dc146a4beb49d5c9319d80a
try {
verifier << index.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;
}
bool BlockManager::FlushUndoFile(int block_file, bool finalize)
{
FlatFilePos undo_pos_old(block_file, m_blockfile_info[block_file].nUndoSize);
if (!UndoFileSeq().Flush(undo_pos_old, finalize)) {
m_opts.notifications.flushError("Flushing undo file to disk failed. This is likely the result of an I/O error.");
return false;
}
return true;
}
bool BlockManager::FlushBlockFile(int blockfile_num, bool fFinalize, bool finalize_undo)
{
bool success = true;
LOCK(cs_LastBlockFile);
if (m_blockfile_info.size() < 1) {
// Return if we haven't loaded any blockfiles yet. This happens during
// chainstate init, when we call ChainstateManager::MaybeRebalanceCaches() (which
// then calls FlushStateToDisk()), resulting in a call to this function before we
// have populated `m_blockfile_info` via LoadBlockIndexDB().
return true;
}
assert(static_cast<int>(m_blockfile_info.size()) > blockfile_num);
FlatFilePos block_pos_old(blockfile_num, m_blockfile_info[blockfile_num].nSize);
if (!BlockFileSeq().Flush(block_pos_old, fFinalize)) {
m_opts.notifications.flushError("Flushing block file to disk failed. This is likely the result of an I/O error.");
success = false;
}
// we do not always flush the undo file, as the chain tip may be lagging behind the incoming blocks,
// e.g. during IBD or a sync after a node going offline
if (!fFinalize || finalize_undo) {
if (!FlushUndoFile(blockfile_num, finalize_undo)) {
success = false;
}
}
return success;
}
BlockfileType BlockManager::BlockfileTypeForHeight(int height)
{
if (!m_snapshot_height) {
return BlockfileType::NORMAL;
}
return (height >= *m_snapshot_height) ? BlockfileType::ASSUMED : BlockfileType::NORMAL;
}
bool BlockManager::FlushChainstateBlockFile(int tip_height)
{
LOCK(cs_LastBlockFile);
auto& cursor = m_blockfile_cursors[BlockfileTypeForHeight(tip_height)];
// If the cursor does not exist, it means an assumeutxo snapshot is loaded,
// but no blocks past the snapshot height have been written yet, so there
// is no data associated with the chainstate, and it is safe not to flush.
if (cursor) {
return FlushBlockFile(cursor->file_num, /*fFinalize=*/false, /*finalize_undo=*/false);
}
// No need to log warnings in this case.
return true;
}
uint64_t BlockManager::CalculateCurrentUsage()
{
LOCK(cs_LastBlockFile);
uint64_t retval = 0;
for (const CBlockFileInfo& file : m_blockfile_info) {
retval += file.nSize + file.nUndoSize;
}
return retval;
}
void BlockManager::UnlinkPrunedFiles(const std::set<int>& setFilesToPrune) const
{
std::error_code ec;
for (std::set<int>::iterator it = setFilesToPrune.begin(); it != setFilesToPrune.end(); ++it) {
FlatFilePos pos(*it, 0);
const bool removed_blockfile{fs::remove(BlockFileSeq().FileName(pos), ec)};
const bool removed_undofile{fs::remove(UndoFileSeq().FileName(pos), ec)};
if (removed_blockfile || removed_undofile) {
LogPrint(BCLog::BLOCKSTORAGE, "Prune: %s deleted blk/rev (%05u)\n", __func__, *it);
}
}
}
FlatFileSeq BlockManager::BlockFileSeq() const
{
return FlatFileSeq(m_opts.blocks_dir, "blk", m_opts.fast_prune ? 0x4000 /* 16kb */ : BLOCKFILE_CHUNK_SIZE);
}
FlatFileSeq BlockManager::UndoFileSeq() const
{
return FlatFileSeq(m_opts.blocks_dir, "rev", UNDOFILE_CHUNK_SIZE);
}
CAutoFile BlockManager::OpenBlockFile(const FlatFilePos& pos, bool fReadOnly) const
{
return CAutoFile{BlockFileSeq().Open(pos, fReadOnly), CLIENT_VERSION};
}
/** Open an undo file (rev?????.dat) */
CAutoFile BlockManager::OpenUndoFile(const FlatFilePos& pos, bool fReadOnly) const
{
return CAutoFile{UndoFileSeq().Open(pos, fReadOnly), CLIENT_VERSION};
}
fs::path BlockManager::GetBlockPosFilename(const FlatFilePos& pos) const
{
return BlockFileSeq().FileName(pos);
}
bool BlockManager::FindBlockPos(FlatFilePos& pos, unsigned int nAddSize, unsigned int nHeight, uint64_t nTime, bool fKnown)
{
LOCK(cs_LastBlockFile);
const BlockfileType chain_type = BlockfileTypeForHeight(nHeight);
if (!m_blockfile_cursors[chain_type]) {
// If a snapshot is loaded during runtime, we may not have initialized this cursor yet.
assert(chain_type == BlockfileType::ASSUMED);
const auto new_cursor = BlockfileCursor{this->MaxBlockfileNum() + 1};
m_blockfile_cursors[chain_type] = new_cursor;
LogPrint(BCLog::BLOCKSTORAGE, "[%s] initializing blockfile cursor to %s\n", chain_type, new_cursor);
}
const int last_blockfile = m_blockfile_cursors[chain_type]->file_num;
int nFile = fKnown ? pos.nFile : last_blockfile;
if (static_cast<int>(m_blockfile_info.size()) <= nFile) {
m_blockfile_info.resize(nFile + 1);
}
bool finalize_undo = false;
if (!fKnown) {
unsigned int max_blockfile_size{MAX_BLOCKFILE_SIZE};
// Use smaller blockfiles in test-only -fastprune mode - but avoid
// the possibility of having a block not fit into the block file.
if (m_opts.fast_prune) {
max_blockfile_size = 0x10000; // 64kiB
if (nAddSize >= max_blockfile_size) {
// dynamically adjust the blockfile size to be larger than the added size
max_blockfile_size = nAddSize + 1;
}
}
assert(nAddSize < max_blockfile_size);
while (m_blockfile_info[nFile].nSize + nAddSize >= max_blockfile_size) {
// when the undo file is keeping up with the block file, we want to flush it explicitly
// when it is lagging behind (more blocks arrive than are being connected), we let the
// undo block write case handle it
finalize_undo = (static_cast<int>(m_blockfile_info[nFile].nHeightLast) ==
Assert(m_blockfile_cursors[chain_type])->undo_height);
// Try the next unclaimed blockfile number
nFile = this->MaxBlockfileNum() + 1;
// Set to increment MaxBlockfileNum() for next iteration
m_blockfile_cursors[chain_type] = BlockfileCursor{nFile};
if (static_cast<int>(m_blockfile_info.size()) <= nFile) {
m_blockfile_info.resize(nFile + 1);
}
}
pos.nFile = nFile;
pos.nPos = m_blockfile_info[nFile].nSize;
}
if (nFile != last_blockfile) {
if (!fKnown) {
LogPrint(BCLog::BLOCKSTORAGE, "Leaving block file %i: %s (onto %i) (height %i)\n",
last_blockfile, m_blockfile_info[last_blockfile].ToString(), nFile, nHeight);
}
// Do not propagate the return code. The flush concerns a previous block
// and undo file that has already been written to. If a flush fails
// here, and we crash, there is no expected additional block data
// inconsistency arising from the flush failure here. However, the undo
// data may be inconsistent after a crash if the flush is called during
// a reindex. A flush error might also leave some of the data files
// untrimmed.
if (!FlushBlockFile(last_blockfile, !fKnown, finalize_undo)) {
LogPrintLevel(BCLog::BLOCKSTORAGE, BCLog::Level::Warning,
"Failed to flush previous block file %05i (finalize=%i, finalize_undo=%i) before opening new block file %05i\n",
last_blockfile, !fKnown, finalize_undo, nFile);
}
// No undo data yet in the new file, so reset our undo-height tracking.
m_blockfile_cursors[chain_type] = BlockfileCursor{nFile};
}
m_blockfile_info[nFile].AddBlock(nHeight, nTime);
if (fKnown) {
m_blockfile_info[nFile].nSize = std::max(pos.nPos + nAddSize, m_blockfile_info[nFile].nSize);
} else {
m_blockfile_info[nFile].nSize += nAddSize;
}
if (!fKnown) {
bool out_of_space;
size_t bytes_allocated = BlockFileSeq().Allocate(pos, nAddSize, out_of_space);
if (out_of_space) {
m_opts.notifications.fatalError("Disk space is too low!", _("Disk space is too low!"));
return false;
}
if (bytes_allocated != 0 && IsPruneMode()) {
m_check_for_pruning = true;
}
}
m_dirty_fileinfo.insert(nFile);
return true;
}
bool BlockManager::FindUndoPos(BlockValidationState& state, int nFile, FlatFilePos& pos, unsigned int nAddSize)
{
pos.nFile = nFile;
LOCK(cs_LastBlockFile);
pos.nPos = m_blockfile_info[nFile].nUndoSize;
m_blockfile_info[nFile].nUndoSize += nAddSize;
m_dirty_fileinfo.insert(nFile);
bool out_of_space;
size_t bytes_allocated = UndoFileSeq().Allocate(pos, nAddSize, out_of_space);
if (out_of_space) {
return FatalError(m_opts.notifications, state, "Disk space is too low!", _("Disk space is too low!"));
}
if (bytes_allocated != 0 && IsPruneMode()) {
m_check_for_pruning = true;
}
return true;
}
bool BlockManager::WriteBlockToDisk(const CBlock& block, FlatFilePos& pos) const
{
// Open history file to append
CAutoFile fileout{OpenBlockFile(pos)};
if (fileout.IsNull()) {
return error("WriteBlockToDisk: OpenBlockFile failed");
}
// Write index header
unsigned int nSize = GetSerializeSize(TX_WITH_WITNESS(block));
fileout << GetParams().MessageStart() << nSize;
// Write block
long fileOutPos = ftell(fileout.Get());
if (fileOutPos < 0) {
return error("WriteBlockToDisk: ftell failed");
}
pos.nPos = (unsigned int)fileOutPos;
fileout << TX_WITH_WITNESS(block);
return true;
}
bool BlockManager::WriteUndoDataForBlock(const CBlockUndo& blockundo, BlockValidationState& state, CBlockIndex& block)
{
AssertLockHeld(::cs_main);
const BlockfileType type = BlockfileTypeForHeight(block.nHeight);
auto& cursor = *Assert(WITH_LOCK(cs_LastBlockFile, return m_blockfile_cursors[type]));
// Write undo information to disk
if (block.GetUndoPos().IsNull()) {
FlatFilePos _pos;
if (!FindUndoPos(state, block.nFile, _pos, ::GetSerializeSize(blockundo) + 40)) {
return error("ConnectBlock(): FindUndoPos failed");
}
if (!UndoWriteToDisk(blockundo, _pos, block.pprev->GetBlockHash())) {
return FatalError(m_opts.notifications, state, "Failed to write undo data");
}
// rev files are written in block height order, whereas blk files are written as blocks come in (often out of order)
// we want to flush the rev (undo) file once we've written the last block, which is indicated by the last height
// in the block file info as below; note that this does not catch the case where the undo writes are keeping up
// with the block writes (usually when a synced up node is getting newly mined blocks) -- this case is caught in
// the FindBlockPos function
if (_pos.nFile < cursor.file_num && static_cast<uint32_t>(block.nHeight) == m_blockfile_info[_pos.nFile].nHeightLast) {
// Do not propagate the return code, a failed flush here should not
// be an indication for a failed write. If it were propagated here,
// the caller would assume the undo data not to be written, when in
// fact it is. Note though, that a failed flush might leave the data
// file untrimmed.
if (!FlushUndoFile(_pos.nFile, true)) {
LogPrintLevel(BCLog::BLOCKSTORAGE, BCLog::Level::Warning, "Failed to flush undo file %05i\n", _pos.nFile);
}
} else if (_pos.nFile == cursor.file_num && block.nHeight > cursor.undo_height) {
cursor.undo_height = block.nHeight;
}
// update nUndoPos in block index
block.nUndoPos = _pos.nPos;
block.nStatus |= BLOCK_HAVE_UNDO;
m_dirty_blockindex.insert(&block);
}
return true;
}
bool BlockManager::ReadBlockFromDisk(CBlock& block, const FlatFilePos& pos) const
{
block.SetNull();
// Open history file to read
CAutoFile filein{OpenBlockFile(pos, true)};
if (filein.IsNull()) {
return error("ReadBlockFromDisk: OpenBlockFile failed for %s", pos.ToString());
}
// Read block
try {
filein >> TX_WITH_WITNESS(block);
} catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s at %s", __func__, e.what(), pos.ToString());
}
// Check the header
if (!CheckProofOfWork(block.GetHash(), block.nBits, GetConsensus())) {
return error("ReadBlockFromDisk: Errors in block header at %s", pos.ToString());
}
// Signet only: check block solution
if (GetConsensus().signet_blocks && !CheckSignetBlockSolution(block, GetConsensus())) {
return error("ReadBlockFromDisk: Errors in block solution at %s", pos.ToString());
}
return true;
}
bool BlockManager::ReadBlockFromDisk(CBlock& block, const CBlockIndex& index) const
{
const FlatFilePos block_pos{WITH_LOCK(cs_main, return index.GetBlockPos())};
if (!ReadBlockFromDisk(block, block_pos)) {
return false;
}
if (block.GetHash() != index.GetBlockHash()) {
return error("ReadBlockFromDisk(CBlock&, CBlockIndex*): GetHash() doesn't match index for %s at %s",
index.ToString(), block_pos.ToString());
}
return true;
}
bool BlockManager::ReadRawBlockFromDisk(std::vector<uint8_t>& block, const FlatFilePos& pos) const
{
FlatFilePos hpos = pos;
hpos.nPos -= 8; // Seek back 8 bytes for meta header
CAutoFile filein{OpenBlockFile(hpos, true)};
if (filein.IsNull()) {
return error("%s: OpenBlockFile failed for %s", __func__, pos.ToString());
}
try {
MessageStartChars blk_start;
unsigned int blk_size;
filein >> blk_start >> blk_size;
if (blk_start != GetParams().MessageStart()) {
return error("%s: Block magic mismatch for %s: %s versus expected %s", __func__, pos.ToString(),
HexStr(blk_start),
HexStr(GetParams().MessageStart()));
}
if (blk_size > MAX_SIZE) {
return error("%s: Block data is larger than maximum deserialization size for %s: %s versus %s", __func__, pos.ToString(),
blk_size, MAX_SIZE);
}
block.resize(blk_size); // Zeroing of memory is intentional here
filein.read(MakeWritableByteSpan(block));
} catch (const std::exception& e) {
return error("%s: Read from block file failed: %s for %s", __func__, e.what(), pos.ToString());
}
return true;
}
FlatFilePos BlockManager::SaveBlockToDisk(const CBlock& block, int nHeight, const FlatFilePos* dbp)
{
unsigned int nBlockSize = ::GetSerializeSize(TX_WITH_WITNESS(block));
FlatFilePos blockPos;
const auto position_known {dbp != nullptr};
if (position_known) {
blockPos = *dbp;
} else {
// when known, blockPos.nPos points at the offset of the block data in the blk file. that already accounts for
// the serialization header present in the file (the 4 magic message start bytes + the 4 length bytes = 8 bytes = BLOCK_SERIALIZATION_HEADER_SIZE).
// we add BLOCK_SERIALIZATION_HEADER_SIZE only for new blocks since they will have the serialization header added when written to disk.
nBlockSize += static_cast<unsigned int>(BLOCK_SERIALIZATION_HEADER_SIZE);
}
if (!FindBlockPos(blockPos, nBlockSize, nHeight, block.GetBlockTime(), position_known)) {
error("%s: FindBlockPos failed", __func__);
return FlatFilePos();
}
if (!position_known) {
if (!WriteBlockToDisk(block, blockPos)) {
m_opts.notifications.fatalError("Failed to write block");
return FlatFilePos();
}
}
return blockPos;
}
class ImportingNow
{
std::atomic<bool>& m_importing;
public:
ImportingNow(std::atomic<bool>& importing) : m_importing{importing}
{
assert(m_importing == false);
m_importing = true;
}
~ImportingNow()
{
assert(m_importing == true);
m_importing = false;
}
};
void ImportBlocks(ChainstateManager& chainman, std::vector<fs::path> vImportFiles)
{
ScheduleBatchPriority();
{
ImportingNow imp{chainman.m_blockman.m_importing};
// -reindex
if (fReindex) {
int nFile = 0;
// Map of disk positions for blocks with unknown parent (only used for reindex);
// parent hash -> child disk position, multiple children can have the same parent.
std::multimap<uint256, FlatFilePos> blocks_with_unknown_parent;
while (true) {
FlatFilePos pos(nFile, 0);
if (!fs::exists(chainman.m_blockman.GetBlockPosFilename(pos))) {
break; // No block files left to reindex
}
CAutoFile file{chainman.m_blockman.OpenBlockFile(pos, true)};
if (file.IsNull()) {
break; // This error is logged in OpenBlockFile
}
LogPrintf("Reindexing block file blk%05u.dat...\n", (unsigned int)nFile);
chainman.LoadExternalBlockFile(file, &pos, &blocks_with_unknown_parent);
if (chainman.m_interrupt) {
LogPrintf("Interrupt requested. Exit %s\n", __func__);
return;
}
nFile++;
}
WITH_LOCK(::cs_main, chainman.m_blockman.m_block_tree_db->WriteReindexing(false));
fReindex = false;
LogPrintf("Reindexing finished\n");
// To avoid ending up in a situation without genesis block, re-try initializing (no-op if reindexing worked):
chainman.ActiveChainstate().LoadGenesisBlock();
}
// -loadblock=
for (const fs::path& path : vImportFiles) {
CAutoFile file{fsbridge::fopen(path, "rb"), CLIENT_VERSION};
if (!file.IsNull()) {
LogPrintf("Importing blocks file %s...\n", fs::PathToString(path));
chainman.LoadExternalBlockFile(file);
if (chainman.m_interrupt) {
LogPrintf("Interrupt requested. Exit %s\n", __func__);
return;
}
} else {
LogPrintf("Warning: Could not open blocks file %s\n", fs::PathToString(path));
}
}
// scan for better chains in the block chain database, that are not yet connected in the active best chain
// We can't hold cs_main during ActivateBestChain even though we're accessing
// the chainman unique_ptrs since ABC requires us not to be holding cs_main, so retrieve
// the relevant pointers before the ABC call.
for (Chainstate* chainstate : WITH_LOCK(::cs_main, return chainman.GetAll())) {
BlockValidationState state;
if (!chainstate->ActivateBestChain(state, nullptr)) {
chainman.GetNotifications().fatalError(strprintf("Failed to connect best block (%s)", state.ToString()));
return;
}
}
} // End scope of ImportingNow
}
std::ostream& operator<<(std::ostream& os, const BlockfileType& type) {
switch(type) {
case BlockfileType::NORMAL: os << "normal"; break;
case BlockfileType::ASSUMED: os << "assumed"; break;
default: os.setstate(std::ios_base::failbit);
}
return os;
}
std::ostream& operator<<(std::ostream& os, const BlockfileCursor& cursor) {
os << strprintf("BlockfileCursor(file_num=%d, undo_height=%d)", cursor.file_num, cursor.undo_height);
return os;
}
} // namespace node
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