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// Copyright (c) 2021 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/chainstate.h>
#include <consensus/params.h>
#include <node/blockstorage.h>
#include <validation.h>
std::optional<ChainstateLoadingError> LoadChainstate(bool fReset,
ChainstateManager& chainman,
CTxMemPool* mempool,
bool fPruneMode,
const Consensus::Params& consensus_params,
bool fReindexChainState,
int64_t nBlockTreeDBCache,
int64_t nCoinDBCache,
int64_t nCoinCacheUsage,
bool block_tree_db_in_memory,
bool coins_db_in_memory,
std::function<bool()> shutdown_requested,
std::function<void()> coins_error_cb)
{
auto is_coinsview_empty = [&](CChainState* chainstate) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
return fReset || fReindexChainState || chainstate->CoinsTip().GetBestBlock().IsNull();
};
LOCK(cs_main);
chainman.InitializeChainstate(mempool);
chainman.m_total_coinstip_cache = nCoinCacheUsage;
chainman.m_total_coinsdb_cache = nCoinDBCache;
UnloadBlockIndex(mempool, chainman);
auto& pblocktree{chainman.m_blockman.m_block_tree_db};
// new CBlockTreeDB tries to delete the existing file, which
// fails if it's still open from the previous loop. Close it first:
pblocktree.reset();
pblocktree.reset(new CBlockTreeDB(nBlockTreeDBCache, block_tree_db_in_memory, fReset));
if (fReset) {
pblocktree->WriteReindexing(true);
//If we're reindexing in prune mode, wipe away unusable block files and all undo data files
if (fPruneMode)
CleanupBlockRevFiles();
}
if (shutdown_requested && shutdown_requested()) return ChainstateLoadingError::SHUTDOWN_PROBED;
// LoadBlockIndex will load fHavePruned if we've ever removed a
// block file from disk.
// Note that it also sets fReindex based on the disk flag!
// From here on out fReindex and fReset mean something different!
if (!chainman.LoadBlockIndex()) {
if (shutdown_requested && shutdown_requested()) return ChainstateLoadingError::SHUTDOWN_PROBED;
return ChainstateLoadingError::ERROR_LOADING_BLOCK_DB;
}
if (!chainman.BlockIndex().empty() &&
!chainman.m_blockman.LookupBlockIndex(consensus_params.hashGenesisBlock)) {
return ChainstateLoadingError::ERROR_BAD_GENESIS_BLOCK;
}
// Check for changed -prune state. What we are concerned about is a user who has pruned blocks
// in the past, but is now trying to run unpruned.
if (fHavePruned && !fPruneMode) {
return ChainstateLoadingError::ERROR_PRUNED_NEEDS_REINDEX;
}
// At this point blocktree args are consistent with what's on disk.
// If we're not mid-reindex (based on disk + args), add a genesis block on disk
// (otherwise we use the one already on disk).
// This is called again in ThreadImport after the reindex completes.
if (!fReindex && !chainman.ActiveChainstate().LoadGenesisBlock()) {
return ChainstateLoadingError::ERROR_LOAD_GENESIS_BLOCK_FAILED;
}
// At this point we're either in reindex or we've loaded a useful
// block tree into BlockIndex()!
for (CChainState* chainstate : chainman.GetAll()) {
chainstate->InitCoinsDB(
/* cache_size_bytes */ nCoinDBCache,
/* in_memory */ coins_db_in_memory,
/* should_wipe */ fReset || fReindexChainState);
if (coins_error_cb) {
chainstate->CoinsErrorCatcher().AddReadErrCallback(coins_error_cb);
}
// If necessary, upgrade from older database format.
// This is a no-op if we cleared the coinsviewdb with -reindex or -reindex-chainstate
if (!chainstate->CoinsDB().Upgrade()) {
return ChainstateLoadingError::ERROR_CHAINSTATE_UPGRADE_FAILED;
}
// ReplayBlocks is a no-op if we cleared the coinsviewdb with -reindex or -reindex-chainstate
if (!chainstate->ReplayBlocks()) {
return ChainstateLoadingError::ERROR_REPLAYBLOCKS_FAILED;
}
// The on-disk coinsdb is now in a good state, create the cache
chainstate->InitCoinsCache(nCoinCacheUsage);
assert(chainstate->CanFlushToDisk());
if (!is_coinsview_empty(chainstate)) {
// LoadChainTip initializes the chain based on CoinsTip()'s best block
if (!chainstate->LoadChainTip()) {
return ChainstateLoadingError::ERROR_LOADCHAINTIP_FAILED;
}
assert(chainstate->m_chain.Tip() != nullptr);
}
}
if (!fReset) {
auto chainstates{chainman.GetAll()};
if (std::any_of(chainstates.begin(), chainstates.end(),
[](const CChainState* cs) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return cs->NeedsRedownload(); })) {
return ChainstateLoadingError::ERROR_BLOCKS_WITNESS_INSUFFICIENTLY_VALIDATED;
}
}
return std::nullopt;
}
std::optional<ChainstateLoadVerifyError> VerifyLoadedChainstate(ChainstateManager& chainman,
bool fReset,
bool fReindexChainState,
const Consensus::Params& consensus_params,
unsigned int check_blocks,
unsigned int check_level,
std::function<int64_t()> get_unix_time_seconds)
{
auto is_coinsview_empty = [&](CChainState* chainstate) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
return fReset || fReindexChainState || chainstate->CoinsTip().GetBestBlock().IsNull();
};
LOCK(cs_main);
for (CChainState* chainstate : chainman.GetAll()) {
if (!is_coinsview_empty(chainstate)) {
const CBlockIndex* tip = chainstate->m_chain.Tip();
if (tip && tip->nTime > get_unix_time_seconds() + 2 * 60 * 60) {
return ChainstateLoadVerifyError::ERROR_BLOCK_FROM_FUTURE;
}
if (!CVerifyDB().VerifyDB(
*chainstate, consensus_params, chainstate->CoinsDB(),
check_level,
check_blocks)) {
return ChainstateLoadVerifyError::ERROR_CORRUPTED_BLOCK_DB;
}
}
}
return std::nullopt;
}
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