diff options
Diffstat (limited to 'src/index/coinstatsindex.cpp')
| -rw-r--r-- | src/index/coinstatsindex.cpp | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/src/index/coinstatsindex.cpp b/src/index/coinstatsindex.cpp new file mode 100644 index 0000000000..7c8b2b186e --- /dev/null +++ b/src/index/coinstatsindex.cpp @@ -0,0 +1,472 @@ +// Copyright (c) 2020-2021 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 <chainparams.h> +#include <coins.h> +#include <crypto/muhash.h> +#include <index/coinstatsindex.h> +#include <node/blockstorage.h> +#include <serialize.h> +#include <txdb.h> +#include <undo.h> +#include <validation.h> + +static constexpr uint8_t DB_BLOCK_HASH{'s'}; +static constexpr uint8_t DB_BLOCK_HEIGHT{'t'}; +static constexpr uint8_t DB_MUHASH{'M'}; + +namespace { + +struct DBVal { + uint256 muhash; + uint64_t transaction_output_count; + uint64_t bogo_size; + CAmount total_amount; + CAmount total_subsidy; + CAmount block_unspendable_amount; + CAmount block_prevout_spent_amount; + CAmount block_new_outputs_ex_coinbase_amount; + CAmount block_coinbase_amount; + CAmount unspendables_genesis_block; + CAmount unspendables_bip30; + CAmount unspendables_scripts; + CAmount unspendables_unclaimed_rewards; + + SERIALIZE_METHODS(DBVal, obj) + { + READWRITE(obj.muhash); + READWRITE(obj.transaction_output_count); + READWRITE(obj.bogo_size); + READWRITE(obj.total_amount); + READWRITE(obj.total_subsidy); + READWRITE(obj.block_unspendable_amount); + READWRITE(obj.block_prevout_spent_amount); + READWRITE(obj.block_new_outputs_ex_coinbase_amount); + READWRITE(obj.block_coinbase_amount); + READWRITE(obj.unspendables_genesis_block); + READWRITE(obj.unspendables_bip30); + READWRITE(obj.unspendables_scripts); + READWRITE(obj.unspendables_unclaimed_rewards); + } +}; + +struct DBHeightKey { + int height; + + explicit DBHeightKey(int height_in) : height(height_in) {} + + template <typename Stream> + void Serialize(Stream& s) const + { + ser_writedata8(s, DB_BLOCK_HEIGHT); + ser_writedata32be(s, height); + } + + template <typename Stream> + void Unserialize(Stream& s) + { + const uint8_t prefix{ser_readdata8(s)}; + if (prefix != DB_BLOCK_HEIGHT) { + throw std::ios_base::failure("Invalid format for coinstatsindex DB height key"); + } + height = ser_readdata32be(s); + } +}; + +struct DBHashKey { + uint256 block_hash; + + explicit DBHashKey(const uint256& hash_in) : block_hash(hash_in) {} + + SERIALIZE_METHODS(DBHashKey, obj) + { + uint8_t prefix{DB_BLOCK_HASH}; + READWRITE(prefix); + if (prefix != DB_BLOCK_HASH) { + throw std::ios_base::failure("Invalid format for coinstatsindex DB hash key"); + } + + READWRITE(obj.block_hash); + } +}; + +}; // namespace + +std::unique_ptr<CoinStatsIndex> g_coin_stats_index; + +CoinStatsIndex::CoinStatsIndex(size_t n_cache_size, bool f_memory, bool f_wipe) +{ + fs::path path{GetDataDir() / "indexes" / "coinstats"}; + fs::create_directories(path); + + m_db = std::make_unique<CoinStatsIndex::DB>(path / "db", n_cache_size, f_memory, f_wipe); +} + +bool CoinStatsIndex::WriteBlock(const CBlock& block, const CBlockIndex* pindex) +{ + CBlockUndo block_undo; + const CAmount block_subsidy{GetBlockSubsidy(pindex->nHeight, Params().GetConsensus())}; + m_total_subsidy += block_subsidy; + + // Ignore genesis block + if (pindex->nHeight > 0) { + if (!UndoReadFromDisk(block_undo, pindex)) { + return false; + } + + std::pair<uint256, DBVal> read_out; + if (!m_db->Read(DBHeightKey(pindex->nHeight - 1), read_out)) { + return false; + } + + uint256 expected_block_hash{pindex->pprev->GetBlockHash()}; + if (read_out.first != expected_block_hash) { + if (!m_db->Read(DBHashKey(expected_block_hash), read_out)) { + return error("%s: previous block header belongs to unexpected block %s; expected %s", + __func__, read_out.first.ToString(), expected_block_hash.ToString()); + } + } + + // TODO: Deduplicate BIP30 related code + bool is_bip30_block{(pindex->nHeight == 91722 && pindex->GetBlockHash() == uint256S("0x00000000000271a2dc26e7667f8419f2e15416dc6955e5a6c6cdf3f2574dd08e")) || + (pindex->nHeight == 91812 && pindex->GetBlockHash() == uint256S("0x00000000000af0aed4792b1acee3d966af36cf5def14935db8de83d6f9306f2f"))}; + + // Add the new utxos created from the block + for (size_t i = 0; i < block.vtx.size(); ++i) { + const auto& tx{block.vtx.at(i)}; + + // Skip duplicate txid coinbase transactions (BIP30). + if (is_bip30_block && tx->IsCoinBase()) { + m_block_unspendable_amount += block_subsidy; + m_unspendables_bip30 += block_subsidy; + continue; + } + + for (size_t j = 0; j < tx->vout.size(); ++j) { + const CTxOut& out{tx->vout[j]}; + Coin coin{out, pindex->nHeight, tx->IsCoinBase()}; + COutPoint outpoint{tx->GetHash(), static_cast<uint32_t>(j)}; + + // Skip unspendable coins + if (coin.out.scriptPubKey.IsUnspendable()) { + m_block_unspendable_amount += coin.out.nValue; + m_unspendables_scripts += coin.out.nValue; + continue; + } + + m_muhash.Insert(MakeUCharSpan(TxOutSer(outpoint, coin))); + + if (tx->IsCoinBase()) { + m_block_coinbase_amount += coin.out.nValue; + } else { + m_block_new_outputs_ex_coinbase_amount += coin.out.nValue; + } + + ++m_transaction_output_count; + m_total_amount += coin.out.nValue; + m_bogo_size += GetBogoSize(coin.out.scriptPubKey); + } + + // The coinbase tx has no undo data since no former output is spent + if (!tx->IsCoinBase()) { + const auto& tx_undo{block_undo.vtxundo.at(i - 1)}; + + for (size_t j = 0; j < tx_undo.vprevout.size(); ++j) { + Coin coin{tx_undo.vprevout[j]}; + COutPoint outpoint{tx->vin[j].prevout.hash, tx->vin[j].prevout.n}; + + m_muhash.Remove(MakeUCharSpan(TxOutSer(outpoint, coin))); + + m_block_prevout_spent_amount += coin.out.nValue; + + --m_transaction_output_count; + m_total_amount -= coin.out.nValue; + m_bogo_size -= GetBogoSize(coin.out.scriptPubKey); + } + } + } + } else { + // genesis block + m_block_unspendable_amount += block_subsidy; + m_unspendables_genesis_block += block_subsidy; + } + + // If spent prevouts + block subsidy are still a higher amount than + // new outputs + coinbase + current unspendable amount this means + // the miner did not claim the full block reward. Unclaimed block + // rewards are also unspendable. + const CAmount unclaimed_rewards{(m_block_prevout_spent_amount + m_total_subsidy) - (m_block_new_outputs_ex_coinbase_amount + m_block_coinbase_amount + m_block_unspendable_amount)}; + m_block_unspendable_amount += unclaimed_rewards; + m_unspendables_unclaimed_rewards += unclaimed_rewards; + + std::pair<uint256, DBVal> value; + value.first = pindex->GetBlockHash(); + value.second.transaction_output_count = m_transaction_output_count; + value.second.bogo_size = m_bogo_size; + value.second.total_amount = m_total_amount; + value.second.total_subsidy = m_total_subsidy; + value.second.block_unspendable_amount = m_block_unspendable_amount; + value.second.block_prevout_spent_amount = m_block_prevout_spent_amount; + value.second.block_new_outputs_ex_coinbase_amount = m_block_new_outputs_ex_coinbase_amount; + value.second.block_coinbase_amount = m_block_coinbase_amount; + value.second.unspendables_genesis_block = m_unspendables_genesis_block; + value.second.unspendables_bip30 = m_unspendables_bip30; + value.second.unspendables_scripts = m_unspendables_scripts; + value.second.unspendables_unclaimed_rewards = m_unspendables_unclaimed_rewards; + + uint256 out; + m_muhash.Finalize(out); + value.second.muhash = out; + + return m_db->Write(DBHeightKey(pindex->nHeight), value) && m_db->Write(DB_MUHASH, m_muhash); +} + +static bool CopyHeightIndexToHashIndex(CDBIterator& db_it, CDBBatch& batch, + const std::string& index_name, + int start_height, int stop_height) +{ + DBHeightKey key{start_height}; + db_it.Seek(key); + + for (int height = start_height; height <= stop_height; ++height) { + if (!db_it.GetKey(key) || key.height != height) { + return error("%s: unexpected key in %s: expected (%c, %d)", + __func__, index_name, DB_BLOCK_HEIGHT, height); + } + + std::pair<uint256, DBVal> value; + if (!db_it.GetValue(value)) { + return error("%s: unable to read value in %s at key (%c, %d)", + __func__, index_name, DB_BLOCK_HEIGHT, height); + } + + batch.Write(DBHashKey(value.first), std::move(value.second)); + + db_it.Next(); + } + return true; +} + +bool CoinStatsIndex::Rewind(const CBlockIndex* current_tip, const CBlockIndex* new_tip) +{ + assert(current_tip->GetAncestor(new_tip->nHeight) == new_tip); + + CDBBatch batch(*m_db); + std::unique_ptr<CDBIterator> db_it(m_db->NewIterator()); + + // During a reorg, we need to copy all hash digests for blocks that are + // getting disconnected from the height index to the hash index so we can + // still find them when the height index entries are overwritten. + if (!CopyHeightIndexToHashIndex(*db_it, batch, m_name, new_tip->nHeight, current_tip->nHeight)) { + return false; + } + + if (!m_db->WriteBatch(batch)) return false; + + { + LOCK(cs_main); + CBlockIndex* iter_tip{g_chainman.m_blockman.LookupBlockIndex(current_tip->GetBlockHash())}; + const auto& consensus_params{Params().GetConsensus()}; + + do { + CBlock block; + + if (!ReadBlockFromDisk(block, iter_tip, consensus_params)) { + return error("%s: Failed to read block %s from disk", + __func__, iter_tip->GetBlockHash().ToString()); + } + + ReverseBlock(block, iter_tip); + + iter_tip = iter_tip->GetAncestor(iter_tip->nHeight - 1); + } while (new_tip != iter_tip); + } + + return BaseIndex::Rewind(current_tip, new_tip); +} + +static bool LookUpOne(const CDBWrapper& db, const CBlockIndex* block_index, DBVal& result) +{ + // First check if the result is stored under the height index and the value + // there matches the block hash. This should be the case if the block is on + // the active chain. + std::pair<uint256, DBVal> read_out; + if (!db.Read(DBHeightKey(block_index->nHeight), read_out)) { + return false; + } + if (read_out.first == block_index->GetBlockHash()) { + result = std::move(read_out.second); + return true; + } + + // If value at the height index corresponds to an different block, the + // result will be stored in the hash index. + return db.Read(DBHashKey(block_index->GetBlockHash()), result); +} + +bool CoinStatsIndex::LookUpStats(const CBlockIndex* block_index, CCoinsStats& coins_stats) const +{ + DBVal entry; + if (!LookUpOne(*m_db, block_index, entry)) { + return false; + } + + coins_stats.hashSerialized = entry.muhash; + coins_stats.nTransactionOutputs = entry.transaction_output_count; + coins_stats.nBogoSize = entry.bogo_size; + coins_stats.nTotalAmount = entry.total_amount; + coins_stats.total_subsidy = entry.total_subsidy; + coins_stats.block_unspendable_amount = entry.block_unspendable_amount; + coins_stats.block_prevout_spent_amount = entry.block_prevout_spent_amount; + coins_stats.block_new_outputs_ex_coinbase_amount = entry.block_new_outputs_ex_coinbase_amount; + coins_stats.block_coinbase_amount = entry.block_coinbase_amount; + coins_stats.unspendables_genesis_block = entry.unspendables_genesis_block; + coins_stats.unspendables_bip30 = entry.unspendables_bip30; + coins_stats.unspendables_scripts = entry.unspendables_scripts; + coins_stats.unspendables_unclaimed_rewards = entry.unspendables_unclaimed_rewards; + + return true; +} + +bool CoinStatsIndex::Init() +{ + if (!m_db->Read(DB_MUHASH, m_muhash)) { + // Check that the cause of the read failure is that the key does not + // exist. Any other errors indicate database corruption or a disk + // failure, and starting the index would cause further corruption. + if (m_db->Exists(DB_MUHASH)) { + return error("%s: Cannot read current %s state; index may be corrupted", + __func__, GetName()); + } + } + + if (BaseIndex::Init()) { + const CBlockIndex* pindex{CurrentIndex()}; + + if (pindex) { + DBVal entry; + if (!LookUpOne(*m_db, pindex, entry)) { + return false; + } + + m_transaction_output_count = entry.transaction_output_count; + m_bogo_size = entry.bogo_size; + m_total_amount = entry.total_amount; + m_total_subsidy = entry.total_subsidy; + m_block_unspendable_amount = entry.block_unspendable_amount; + m_block_prevout_spent_amount = entry.block_prevout_spent_amount; + m_block_new_outputs_ex_coinbase_amount = entry.block_new_outputs_ex_coinbase_amount; + m_block_coinbase_amount = entry.block_coinbase_amount; + m_unspendables_genesis_block = entry.unspendables_genesis_block; + m_unspendables_bip30 = entry.unspendables_bip30; + m_unspendables_scripts = entry.unspendables_scripts; + m_unspendables_unclaimed_rewards = entry.unspendables_unclaimed_rewards; + } + + return true; + } + + return false; +} + +// Reverse a single block as part of a reorg +bool CoinStatsIndex::ReverseBlock(const CBlock& block, const CBlockIndex* pindex) +{ + CBlockUndo block_undo; + std::pair<uint256, DBVal> read_out; + + const CAmount block_subsidy{GetBlockSubsidy(pindex->nHeight, Params().GetConsensus())}; + m_total_subsidy -= block_subsidy; + + // Ignore genesis block + if (pindex->nHeight > 0) { + if (!UndoReadFromDisk(block_undo, pindex)) { + return false; + } + + if (!m_db->Read(DBHeightKey(pindex->nHeight - 1), read_out)) { + return false; + } + + uint256 expected_block_hash{pindex->pprev->GetBlockHash()}; + if (read_out.first != expected_block_hash) { + if (!m_db->Read(DBHashKey(expected_block_hash), read_out)) { + return error("%s: previous block header belongs to unexpected block %s; expected %s", + __func__, read_out.first.ToString(), expected_block_hash.ToString()); + } + } + } + + // Remove the new UTXOs that were created from the block + for (size_t i = 0; i < block.vtx.size(); ++i) { + const auto& tx{block.vtx.at(i)}; + + for (size_t j = 0; j < tx->vout.size(); ++j) { + const CTxOut& out{tx->vout[j]}; + COutPoint outpoint{tx->GetHash(), static_cast<uint32_t>(j)}; + Coin coin{out, pindex->nHeight, tx->IsCoinBase()}; + + // Skip unspendable coins + if (coin.out.scriptPubKey.IsUnspendable()) { + m_block_unspendable_amount -= coin.out.nValue; + m_unspendables_scripts -= coin.out.nValue; + continue; + } + + m_muhash.Remove(MakeUCharSpan(TxOutSer(outpoint, coin))); + + if (tx->IsCoinBase()) { + m_block_coinbase_amount -= coin.out.nValue; + } else { + m_block_new_outputs_ex_coinbase_amount -= coin.out.nValue; + } + + --m_transaction_output_count; + m_total_amount -= coin.out.nValue; + m_bogo_size -= GetBogoSize(coin.out.scriptPubKey); + } + + // The coinbase tx has no undo data since no former output is spent + if (!tx->IsCoinBase()) { + const auto& tx_undo{block_undo.vtxundo.at(i - 1)}; + + for (size_t j = 0; j < tx_undo.vprevout.size(); ++j) { + Coin coin{tx_undo.vprevout[j]}; + COutPoint outpoint{tx->vin[j].prevout.hash, tx->vin[j].prevout.n}; + + m_muhash.Insert(MakeUCharSpan(TxOutSer(outpoint, coin))); + + m_block_prevout_spent_amount -= coin.out.nValue; + + m_transaction_output_count++; + m_total_amount += coin.out.nValue; + m_bogo_size += GetBogoSize(coin.out.scriptPubKey); + } + } + } + + const CAmount unclaimed_rewards{(m_block_new_outputs_ex_coinbase_amount + m_block_coinbase_amount + m_block_unspendable_amount) - (m_block_prevout_spent_amount + m_total_subsidy)}; + m_block_unspendable_amount -= unclaimed_rewards; + m_unspendables_unclaimed_rewards -= unclaimed_rewards; + + // Check that the rolled back internal values are consistent with the DB read out + uint256 out; + m_muhash.Finalize(out); + Assert(read_out.second.muhash == out); + + Assert(m_transaction_output_count == read_out.second.transaction_output_count); + Assert(m_total_amount == read_out.second.total_amount); + Assert(m_bogo_size == read_out.second.bogo_size); + Assert(m_total_subsidy == read_out.second.total_subsidy); + Assert(m_block_unspendable_amount == read_out.second.block_unspendable_amount); + Assert(m_block_prevout_spent_amount == read_out.second.block_prevout_spent_amount); + Assert(m_block_new_outputs_ex_coinbase_amount == read_out.second.block_new_outputs_ex_coinbase_amount); + Assert(m_block_coinbase_amount == read_out.second.block_coinbase_amount); + Assert(m_unspendables_genesis_block == read_out.second.unspendables_genesis_block); + Assert(m_unspendables_bip30 == read_out.second.unspendables_bip30); + Assert(m_unspendables_scripts == read_out.second.unspendables_scripts); + Assert(m_unspendables_unclaimed_rewards == read_out.second.unspendables_unclaimed_rewards); + + return m_db->Write(DB_MUHASH, m_muhash); +} |