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validation: add ChainMan logic for completing UTXO snapshot validation
Trigger completion when a background validation chainstate reaches the same height as a UTXO snapshot, and handle cleaning up the chainstate on subsequent startup.
This commit is contained in:
James O'Beirne
parent
f2a4f3376f
commit
d96c59cc5c
3 changed files with 421 additions and 3 deletions
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@ -85,6 +85,9 @@ static ChainstateLoadResult CompleteChainstateInitialization(
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return options.reindex || options.reindex_chainstate || chainstate->CoinsTip().GetBestBlock().IsNull();
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};
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assert(chainman.m_total_coinstip_cache > 0);
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assert(chainman.m_total_coinsdb_cache > 0);
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// Conservative value which is arbitrarily chosen, as it will ultimately be changed
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// by a call to `chainman.MaybeRebalanceCaches()`. We just need to make sure
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// that the sum of the two caches (40%) does not exceed the allowable amount
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@ -183,6 +186,47 @@ ChainstateLoadResult LoadChainstate(ChainstateManager& chainman, const CacheSize
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return {init_status, init_error};
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}
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// If a snapshot chainstate was fully validated by a background chainstate during
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// the last run, detect it here and clean up the now-unneeded background
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// chainstate.
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//
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// Why is this cleanup done here (on subsequent restart) and not just when the
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// snapshot is actually validated? Because this entails unusual
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// filesystem operations to move leveldb data directories around, and that seems
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// too risky to do in the middle of normal runtime.
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auto snapshot_completion = chainman.MaybeCompleteSnapshotValidation();
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if (snapshot_completion == SnapshotCompletionResult::SKIPPED) {
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// do nothing; expected case
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} else if (snapshot_completion == SnapshotCompletionResult::SUCCESS) {
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LogPrintf("[snapshot] cleaning up unneeded background chainstate, then reinitializing\n");
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if (!chainman.ValidatedSnapshotCleanup()) {
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AbortNode("Background chainstate cleanup failed unexpectedly.");
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}
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// Because ValidatedSnapshotCleanup() has torn down chainstates with
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// ChainstateManager::ResetChainstates(), reinitialize them here without
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// duplicating the blockindex work above.
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assert(chainman.GetAll().empty());
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assert(!chainman.IsSnapshotActive());
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assert(!chainman.IsSnapshotValidated());
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chainman.InitializeChainstate(options.mempool);
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// A reload of the block index is required to recompute setBlockIndexCandidates
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// for the fully validated chainstate.
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chainman.ActiveChainstate().UnloadBlockIndex();
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auto [init_status, init_error] = CompleteChainstateInitialization(chainman, cache_sizes, options);
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if (init_status != ChainstateLoadStatus::SUCCESS) {
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return {init_status, init_error};
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}
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} else {
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return {ChainstateLoadStatus::FAILURE, _(
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"UTXO snapshot failed to validate. "
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"Restart to resume normal initial block download, or try loading a different snapshot.")};
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}
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return {ChainstateLoadStatus::SUCCESS, {}};
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}
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@ -2845,6 +2845,14 @@ bool Chainstate::ConnectTip(BlockValidationState& state, CBlockIndex* pindexNew,
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Ticks<SecondsDouble>(time_total),
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Ticks<MillisecondsDouble>(time_total) / num_blocks_total);
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// If we are the background validation chainstate, check to see if we are done
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// validating the snapshot (i.e. our tip has reached the snapshot's base block).
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if (this != &m_chainman.ActiveChainstate()) {
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// This call may set `m_disabled`, which is referenced immediately afterwards in
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// ActivateBestChain, so that we stop connecting blocks past the snapshot base.
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m_chainman.MaybeCompleteSnapshotValidation();
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}
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connectTrace.BlockConnected(pindexNew, std::move(pthisBlock));
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return true;
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}
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@ -3067,6 +3075,14 @@ bool Chainstate::ActivateBestChain(BlockValidationState& state, std::shared_ptr<
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// we use m_chainstate_mutex to enforce mutual exclusion so that only one caller may execute this function at a time
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LOCK(m_chainstate_mutex);
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// Belt-and-suspenders check that we aren't attempting to advance the background
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// chainstate past the snapshot base block.
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if (WITH_LOCK(::cs_main, return m_disabled)) {
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LogPrintf("m_disabled is set - this chainstate should not be in operation. " /* Continued */
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"Please report this as a bug. %s\n", PACKAGE_BUGREPORT);
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return false;
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}
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CBlockIndex *pindexMostWork = nullptr;
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CBlockIndex *pindexNewTip = nullptr;
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int nStopAtHeight = gArgs.GetIntArg("-stopatheight", DEFAULT_STOPATHEIGHT);
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@ -3117,6 +3133,15 @@ bool Chainstate::ActivateBestChain(BlockValidationState& state, std::shared_ptr<
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assert(trace.pblock && trace.pindex);
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GetMainSignals().BlockConnected(trace.pblock, trace.pindex);
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}
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// This will have been toggled in
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// ActivateBestChainStep -> ConnectTip -> MaybeCompleteSnapshotValidation,
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// if at all, so we should catch it here.
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//
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// Break this do-while to ensure we don't advance past the base snapshot.
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if (m_disabled) {
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break;
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}
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} while (!m_chain.Tip() || (starting_tip && CBlockIndexWorkComparator()(m_chain.Tip(), starting_tip)));
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if (!blocks_connected) return true;
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@ -3137,6 +3162,11 @@ bool Chainstate::ActivateBestChain(BlockValidationState& state, std::shared_ptr<
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if (nStopAtHeight && pindexNewTip && pindexNewTip->nHeight >= nStopAtHeight) StartShutdown();
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if (WITH_LOCK(::cs_main, return m_disabled)) {
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// Background chainstate has reached the snapshot base block, so exit.
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break;
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}
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// We check shutdown only after giving ActivateBestChainStep a chance to run once so that we
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// never shutdown before connecting the genesis block during LoadChainTip(). Previously this
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// caused an assert() failure during shutdown in such cases as the UTXO DB flushing checks
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@ -5046,6 +5076,19 @@ static void FlushSnapshotToDisk(CCoinsViewCache& coins_cache, bool snapshot_load
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coins_cache.Flush();
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}
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struct StopHashingException : public std::exception
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{
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const char* what() const throw() override
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{
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return "ComputeUTXOStats interrupted by shutdown.";
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}
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};
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static void SnapshotUTXOHashBreakpoint()
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{
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if (ShutdownRequested()) throw StopHashingException();
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}
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bool ChainstateManager::PopulateAndValidateSnapshot(
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Chainstate& snapshot_chainstate,
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AutoFile& coins_file,
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@ -5169,13 +5212,18 @@ bool ChainstateManager::PopulateAndValidateSnapshot(
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assert(coins_cache.GetBestBlock() == base_blockhash);
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auto breakpoint_fnc = [] { /* TODO insert breakpoint here? */ };
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// As above, okay to immediately release cs_main here since no other context knows
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// about the snapshot_chainstate.
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CCoinsViewDB* snapshot_coinsdb = WITH_LOCK(::cs_main, return &snapshot_chainstate.CoinsDB());
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const std::optional<CCoinsStats> maybe_stats = ComputeUTXOStats(CoinStatsHashType::HASH_SERIALIZED, snapshot_coinsdb, m_blockman, breakpoint_fnc);
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std::optional<CCoinsStats> maybe_stats;
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try {
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maybe_stats = ComputeUTXOStats(
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CoinStatsHashType::HASH_SERIALIZED, snapshot_coinsdb, m_blockman, SnapshotUTXOHashBreakpoint);
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} catch (StopHashingException const&) {
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return false;
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}
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if (!maybe_stats.has_value()) {
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LogPrintf("[snapshot] failed to generate coins stats\n");
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return false;
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@ -5243,6 +5291,149 @@ bool ChainstateManager::PopulateAndValidateSnapshot(
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return true;
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}
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// Currently, this function holds cs_main for its duration, which could be for
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// multiple minutes due to the ComputeUTXOStats call. This hold is necessary
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// because we need to avoid advancing the background validation chainstate
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// farther than the snapshot base block - and this function is also invoked
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// from within ConnectTip, i.e. from within ActivateBestChain, so cs_main is
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// held anyway.
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//
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// Eventually (TODO), we could somehow separate this function's runtime from
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// maintenance of the active chain, but that will either require
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//
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// (i) setting `m_disabled` immediately and ensuring all chainstate accesses go
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// through IsUsable() checks, or
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//
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// (ii) giving each chainstate its own lock instead of using cs_main for everything.
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SnapshotCompletionResult ChainstateManager::MaybeCompleteSnapshotValidation(
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std::function<void(bilingual_str)> shutdown_fnc)
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{
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AssertLockHeld(cs_main);
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if (m_ibd_chainstate.get() == &this->ActiveChainstate() ||
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!this->IsUsable(m_snapshot_chainstate.get()) ||
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!this->IsUsable(m_ibd_chainstate.get()) ||
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!m_ibd_chainstate->m_chain.Tip()) {
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// Nothing to do - this function only applies to the background
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// validation chainstate.
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return SnapshotCompletionResult::SKIPPED;
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}
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const int snapshot_tip_height = this->ActiveHeight();
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const int snapshot_base_height = *Assert(this->GetSnapshotBaseHeight());
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const CBlockIndex& index_new = *Assert(m_ibd_chainstate->m_chain.Tip());
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if (index_new.nHeight < snapshot_base_height) {
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// Background IBD not complete yet.
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return SnapshotCompletionResult::SKIPPED;
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}
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assert(SnapshotBlockhash());
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uint256 snapshot_blockhash = *Assert(SnapshotBlockhash());
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auto handle_invalid_snapshot = [&]() EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
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bilingual_str user_error = strprintf(_(
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"%s failed to validate the -assumeutxo snapshot state. "
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"This indicates a hardware problem, or a bug in the software, or a "
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"bad software modification that allowed an invalid snapshot to be "
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"loaded. As a result of this, the node will shut down and stop using any "
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"state that was built on the snapshot, resetting the chain height "
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"from %d to %d. On the next "
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"restart, the node will resume syncing from %d "
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"without using any snapshot data. "
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"Please report this incident to %s, including how you obtained the snapshot. "
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"The invalid snapshot chainstate has been left on disk in case it is "
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"helpful in diagnosing the issue that caused this error."),
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PACKAGE_NAME, snapshot_tip_height, snapshot_base_height, snapshot_base_height, PACKAGE_BUGREPORT
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);
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LogPrintf("[snapshot] !!! %s\n", user_error.original);
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LogPrintf("[snapshot] deleting snapshot, reverting to validated chain, and stopping node\n");
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m_active_chainstate = m_ibd_chainstate.get();
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m_snapshot_chainstate->m_disabled = true;
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assert(!this->IsUsable(m_snapshot_chainstate.get()));
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assert(this->IsUsable(m_ibd_chainstate.get()));
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m_snapshot_chainstate->InvalidateCoinsDBOnDisk();
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shutdown_fnc(user_error);
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};
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if (index_new.GetBlockHash() != snapshot_blockhash) {
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LogPrintf("[snapshot] supposed base block %s does not match the " /* Continued */
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"snapshot base block %s (height %d). Snapshot is not valid.",
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index_new.ToString(), snapshot_blockhash.ToString(), snapshot_base_height);
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handle_invalid_snapshot();
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return SnapshotCompletionResult::BASE_BLOCKHASH_MISMATCH;
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}
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assert(index_new.nHeight == snapshot_base_height);
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int curr_height = m_ibd_chainstate->m_chain.Height();
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assert(snapshot_base_height == curr_height);
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assert(snapshot_base_height == index_new.nHeight);
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assert(this->IsUsable(m_snapshot_chainstate.get()));
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assert(this->GetAll().size() == 2);
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CCoinsViewDB& ibd_coins_db = m_ibd_chainstate->CoinsDB();
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m_ibd_chainstate->ForceFlushStateToDisk();
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auto maybe_au_data = ExpectedAssumeutxo(curr_height, ::Params());
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if (!maybe_au_data) {
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LogPrintf("[snapshot] assumeutxo data not found for height " /* Continued */
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"(%d) - refusing to validate snapshot\n", curr_height);
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handle_invalid_snapshot();
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return SnapshotCompletionResult::MISSING_CHAINPARAMS;
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}
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const AssumeutxoData& au_data = *maybe_au_data;
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std::optional<CCoinsStats> maybe_ibd_stats;
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LogPrintf("[snapshot] computing UTXO stats for background chainstate to validate " /* Continued */
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"snapshot - this could take a few minutes\n");
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try {
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maybe_ibd_stats = ComputeUTXOStats(
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CoinStatsHashType::HASH_SERIALIZED,
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&ibd_coins_db,
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m_blockman,
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SnapshotUTXOHashBreakpoint);
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} catch (StopHashingException const&) {
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return SnapshotCompletionResult::STATS_FAILED;
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}
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// XXX note that this function is slow and will hold cs_main for potentially minutes.
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if (!maybe_ibd_stats) {
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LogPrintf("[snapshot] failed to generate stats for validation coins db\n");
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// While this isn't a problem with the snapshot per se, this condition
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// prevents us from validating the snapshot, so we should shut down and let the
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// user handle the issue manually.
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handle_invalid_snapshot();
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return SnapshotCompletionResult::STATS_FAILED;
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}
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const auto& ibd_stats = *maybe_ibd_stats;
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// Compare the background validation chainstate's UTXO set hash against the hard-coded
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// assumeutxo hash we expect.
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//
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// TODO: For belt-and-suspenders, we could cache the UTXO set
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// hash for the snapshot when it's loaded in its chainstate's leveldb. We could then
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// reference that here for an additional check.
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if (AssumeutxoHash{ibd_stats.hashSerialized} != au_data.hash_serialized) {
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LogPrintf("[snapshot] hash mismatch: actual=%s, expected=%s\n",
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ibd_stats.hashSerialized.ToString(),
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au_data.hash_serialized.ToString());
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handle_invalid_snapshot();
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return SnapshotCompletionResult::HASH_MISMATCH;
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}
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LogPrintf("[snapshot] snapshot beginning at %s has been fully validated\n",
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snapshot_blockhash.ToString());
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m_ibd_chainstate->m_disabled = true;
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this->MaybeRebalanceCaches();
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return SnapshotCompletionResult::SUCCESS;
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}
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Chainstate& ChainstateManager::ActiveChainstate() const
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{
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LOCK(::cs_main);
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@ -5367,6 +5558,44 @@ bool IsBIP30Unspendable(const CBlockIndex& block_index)
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(block_index.nHeight==91812 && block_index.GetBlockHash() == uint256S("0x00000000000af0aed4792b1acee3d966af36cf5def14935db8de83d6f9306f2f"));
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}
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void Chainstate::InvalidateCoinsDBOnDisk()
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{
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AssertLockHeld(::cs_main);
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// Should never be called on a non-snapshot chainstate.
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assert(m_from_snapshot_blockhash);
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auto storage_path_maybe = this->CoinsDB().StoragePath();
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// Should never be called with a non-existent storage path.
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assert(storage_path_maybe);
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fs::path snapshot_datadir = *storage_path_maybe;
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// Coins views no longer usable.
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m_coins_views.reset();
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auto invalid_path = snapshot_datadir + "_INVALID";
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std::string dbpath = fs::PathToString(snapshot_datadir);
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std::string target = fs::PathToString(invalid_path);
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LogPrintf("[snapshot] renaming snapshot datadir %s to %s\n", dbpath, target);
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// The invalid snapshot datadir is simply moved and not deleted because we may
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// want to do forensics later during issue investigation. The user is instructed
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// accordingly in MaybeCompleteSnapshotValidation().
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try {
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fs::rename(snapshot_datadir, invalid_path);
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} catch (const fs::filesystem_error& e) {
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auto src_str = fs::PathToString(snapshot_datadir);
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auto dest_str = fs::PathToString(invalid_path);
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LogPrintf("%s: error renaming file '%s' -> '%s': %s\n",
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__func__, src_str, dest_str, e.what());
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AbortNode(strprintf(
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"Rename of '%s' -> '%s' failed. "
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"You should resolve this by manually moving or deleting the invalid "
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"snapshot directory %s, otherwise you will encounter the same error again "
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"on the next startup.",
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src_str, dest_str, src_str));
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}
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}
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const CBlockIndex* ChainstateManager::GetSnapshotBaseBlock() const
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{
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const auto blockhash_op = this->SnapshotBlockhash();
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@ -5379,3 +5608,90 @@ std::optional<int> ChainstateManager::GetSnapshotBaseHeight() const
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const CBlockIndex* base = this->GetSnapshotBaseBlock();
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return base ? std::make_optional(base->nHeight) : std::nullopt;
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}
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bool ChainstateManager::ValidatedSnapshotCleanup()
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{
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AssertLockHeld(::cs_main);
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auto get_storage_path = [](auto& chainstate) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) -> std::optional<fs::path> {
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if (!(chainstate && chainstate->HasCoinsViews())) {
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return {};
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}
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return chainstate->CoinsDB().StoragePath();
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};
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std::optional<fs::path> ibd_chainstate_path_maybe = get_storage_path(m_ibd_chainstate);
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std::optional<fs::path> snapshot_chainstate_path_maybe = get_storage_path(m_snapshot_chainstate);
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if (!this->IsSnapshotValidated()) {
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// No need to clean up.
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return false;
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}
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// If either path doesn't exist, that means at least one of the chainstates
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// is in-memory, in which case we can't do on-disk cleanup. You'd better be
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// in a unittest!
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if (!ibd_chainstate_path_maybe || !snapshot_chainstate_path_maybe) {
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LogPrintf("[snapshot] snapshot chainstate cleanup cannot happen with " /* Continued */
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"in-memory chainstates. You are testing, right?\n");
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return false;
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}
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const auto& snapshot_chainstate_path = *snapshot_chainstate_path_maybe;
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const auto& ibd_chainstate_path = *ibd_chainstate_path_maybe;
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// Since we're going to be moving around the underlying leveldb filesystem content
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// for each chainstate, make sure that the chainstates (and their constituent
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// CoinsViews members) have been destructed first.
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//
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// The caller of this method will be responsible for reinitializing chainstates
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// if they want to continue operation.
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this->ResetChainstates();
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// No chainstates should be considered usable.
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assert(this->GetAll().size() == 0);
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LogPrintf("[snapshot] deleting background chainstate directory (now unnecessary) (%s)\n",
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fs::PathToString(ibd_chainstate_path));
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fs::path tmp_old{ibd_chainstate_path + "_todelete"};
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auto rename_failed_abort = [](
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fs::path p_old,
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fs::path p_new,
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const fs::filesystem_error& err) {
|
||||
LogPrintf("%s: error renaming file (%s): %s\n",
|
||||
__func__, fs::PathToString(p_old), err.what());
|
||||
AbortNode(strprintf(
|
||||
"Rename of '%s' -> '%s' failed. "
|
||||
"Cannot clean up the background chainstate leveldb directory.",
|
||||
fs::PathToString(p_old), fs::PathToString(p_new)));
|
||||
};
|
||||
|
||||
try {
|
||||
fs::rename(ibd_chainstate_path, tmp_old);
|
||||
} catch (const fs::filesystem_error& e) {
|
||||
rename_failed_abort(ibd_chainstate_path, tmp_old, e);
|
||||
throw;
|
||||
}
|
||||
|
||||
LogPrintf("[snapshot] moving snapshot chainstate (%s) to " /* Continued */
|
||||
"default chainstate directory (%s)\n",
|
||||
fs::PathToString(snapshot_chainstate_path), fs::PathToString(ibd_chainstate_path));
|
||||
|
||||
try {
|
||||
fs::rename(snapshot_chainstate_path, ibd_chainstate_path);
|
||||
} catch (const fs::filesystem_error& e) {
|
||||
rename_failed_abort(snapshot_chainstate_path, ibd_chainstate_path, e);
|
||||
throw;
|
||||
}
|
||||
|
||||
if (!DeleteCoinsDBFromDisk(tmp_old, /*is_snapshot=*/false)) {
|
||||
// No need to AbortNode because once the unneeded bg chainstate data is
|
||||
// moved, it will not interfere with subsequent initialization.
|
||||
LogPrintf("Deletion of %s failed. Please remove it manually, as the " /* Continued */
|
||||
"directory is now unnecessary.\n",
|
||||
fs::PathToString(tmp_old));
|
||||
} else {
|
||||
LogPrintf("[snapshot] deleted background chainstate directory (%s)\n",
|
||||
fs::PathToString(ibd_chainstate_path));
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -24,6 +24,7 @@
|
|||
#include <policy/packages.h>
|
||||
#include <policy/policy.h>
|
||||
#include <script/script_error.h>
|
||||
#include <shutdown.h>
|
||||
#include <sync.h>
|
||||
#include <txdb.h>
|
||||
#include <txmempool.h> // For CTxMemPool::cs
|
||||
|
|
@ -663,6 +664,12 @@ public:
|
|||
* May not be called with cs_main held. May not be called in a
|
||||
* validationinterface callback.
|
||||
*
|
||||
* Note that if this is called while a snapshot chainstate is active, and if
|
||||
* it is called on a background chainstate whose tip has reached the base block
|
||||
* of the snapshot, its execution will take *MINUTES* while it hashes the
|
||||
* background UTXO set to verify the assumeutxo value the snapshot was activated
|
||||
* with. `cs_main` will be held during this time.
|
||||
*
|
||||
* @returns true unless a system error occurred
|
||||
*/
|
||||
bool ActivateBestChain(
|
||||
|
|
@ -784,9 +791,37 @@ private:
|
|||
std::chrono::microseconds m_last_write{0};
|
||||
std::chrono::microseconds m_last_flush{0};
|
||||
|
||||
/**
|
||||
* In case of an invalid snapshot, rename the coins leveldb directory so
|
||||
* that it can be examined for issue diagnosis.
|
||||
*/
|
||||
void InvalidateCoinsDBOnDisk() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
|
||||
|
||||
friend ChainstateManager;
|
||||
};
|
||||
|
||||
|
||||
enum class SnapshotCompletionResult {
|
||||
SUCCESS,
|
||||
SKIPPED,
|
||||
|
||||
// Expected assumeutxo configuration data is not found for the height of the
|
||||
// base block.
|
||||
MISSING_CHAINPARAMS,
|
||||
|
||||
// Failed to generate UTXO statistics (to check UTXO set hash) for the background
|
||||
// chainstate.
|
||||
STATS_FAILED,
|
||||
|
||||
// The UTXO set hash of the background validation chainstate does not match
|
||||
// the one expected by assumeutxo chainparams.
|
||||
HASH_MISMATCH,
|
||||
|
||||
// The blockhash of the current tip of the background validation chainstate does
|
||||
// not match the one expected by the snapshot chainstate.
|
||||
BASE_BLOCKHASH_MISMATCH,
|
||||
};
|
||||
|
||||
/**
|
||||
* Provides an interface for creating and interacting with one or two
|
||||
* chainstates: an IBD chainstate generated by downloading blocks, and
|
||||
|
|
@ -984,6 +1019,18 @@ public:
|
|||
[[nodiscard]] bool ActivateSnapshot(
|
||||
AutoFile& coins_file, const node::SnapshotMetadata& metadata, bool in_memory);
|
||||
|
||||
//! Once the background validation chainstate has reached the height which
|
||||
//! is the base of the UTXO snapshot in use, compare its coins to ensure
|
||||
//! they match those expected by the snapshot.
|
||||
//!
|
||||
//! If the coins match (expected), then mark the validation chainstate for
|
||||
//! deletion and continue using the snapshot chainstate as active.
|
||||
//! Otherwise, revert to using the ibd chainstate and shutdown.
|
||||
SnapshotCompletionResult MaybeCompleteSnapshotValidation(
|
||||
std::function<void(bilingual_str)> shutdown_fnc =
|
||||
[](bilingual_str msg) { AbortNode(msg.original, msg); })
|
||||
EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
|
||||
|
||||
//! The most-work chain.
|
||||
Chainstate& ActiveChainstate() const;
|
||||
CChain& ActiveChain() const EXCLUSIVE_LOCKS_REQUIRED(GetMutex()) { return ActiveChainstate().m_chain; }
|
||||
|
|
@ -1091,6 +1138,17 @@ public:
|
|||
Chainstate& ActivateExistingSnapshot(CTxMemPool* mempool, uint256 base_blockhash)
|
||||
EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
|
||||
|
||||
//! If we have validated a snapshot chain during this runtime, copy its
|
||||
//! chainstate directory over to the main `chainstate` location, completing
|
||||
//! validation of the snapshot.
|
||||
//!
|
||||
//! If the cleanup succeeds, the caller will need to ensure chainstates are
|
||||
//! reinitialized, since ResetChainstates() will be called before leveldb
|
||||
//! directories are moved or deleted.
|
||||
//!
|
||||
//! @sa node/chainstate:LoadChainstate()
|
||||
bool ValidatedSnapshotCleanup() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
|
||||
|
||||
~ChainstateManager();
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue