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// Copyright (c) 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 <kernel/coinstats.h>
#include <coins.h>
#include <crypto/muhash.h>
#include <hash.h>
#include <serialize.h>
#include <uint256.h>
#include <util/overflow.h>
#include <util/system.h>
#include <validation.h>
#include <map>
namespace kernel {
CCoinsStats::CCoinsStats(int block_height, const uint256& block_hash)
: nHeight(block_height),
hashBlock(block_hash) {}
// Database-independent metric indicating the UTXO set size
uint64_t GetBogoSize(const CScript& script_pub_key)
{
return 32 /* txid */ +
4 /* vout index */ +
4 /* height + coinbase */ +
8 /* amount */ +
2 /* scriptPubKey len */ +
script_pub_key.size() /* scriptPubKey */;
}
CDataStream TxOutSer(const COutPoint& outpoint, const Coin& coin) {
CDataStream ss(SER_DISK, PROTOCOL_VERSION);
ss << outpoint;
ss << static_cast<uint32_t>(coin.nHeight * 2 + coin.fCoinBase);
ss << coin.out;
return ss;
}
//! Warning: be very careful when changing this! assumeutxo and UTXO snapshot
//! validation commitments are reliant on the hash constructed by this
//! function.
//!
//! If the construction of this hash is changed, it will invalidate
//! existing UTXO snapshots. This will not result in any kind of consensus
//! failure, but it will force clients that were expecting to make use of
//! assumeutxo to do traditional IBD instead.
//!
//! It is also possible, though very unlikely, that a change in this
//! construction could cause a previously invalid (and potentially malicious)
//! UTXO snapshot to be considered valid.
static void ApplyHash(CHashWriter& ss, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
{
for (auto it = outputs.begin(); it != outputs.end(); ++it) {
if (it == outputs.begin()) {
ss << hash;
ss << VARINT(it->second.nHeight * 2 + it->second.fCoinBase ? 1u : 0u);
}
ss << VARINT(it->first + 1);
ss << it->second.out.scriptPubKey;
ss << VARINT_MODE(it->second.out.nValue, VarIntMode::NONNEGATIVE_SIGNED);
if (it == std::prev(outputs.end())) {
ss << VARINT(0u);
}
}
}
static void ApplyHash(std::nullptr_t, const uint256& hash, const std::map<uint32_t, Coin>& outputs) {}
static void ApplyHash(MuHash3072& muhash, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
{
for (auto it = outputs.begin(); it != outputs.end(); ++it) {
COutPoint outpoint = COutPoint(hash, it->first);
Coin coin = it->second;
muhash.Insert(MakeUCharSpan(TxOutSer(outpoint, coin)));
}
}
static void ApplyStats(CCoinsStats& stats, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
{
assert(!outputs.empty());
stats.nTransactions++;
for (auto it = outputs.begin(); it != outputs.end(); ++it) {
stats.nTransactionOutputs++;
if (stats.total_amount.has_value()) {
stats.total_amount = CheckedAdd(*stats.total_amount, it->second.out.nValue);
}
stats.nBogoSize += GetBogoSize(it->second.out.scriptPubKey);
}
}
//! Calculate statistics about the unspent transaction output set
template <typename T>
static bool ComputeUTXOStats(CCoinsView* view, CCoinsStats& stats, T hash_obj, const std::function<void()>& interruption_point)
{
std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
assert(pcursor);
PrepareHash(hash_obj, stats);
uint256 prevkey;
std::map<uint32_t, Coin> outputs;
while (pcursor->Valid()) {
interruption_point();
COutPoint key;
Coin coin;
if (pcursor->GetKey(key) && pcursor->GetValue(coin)) {
if (!outputs.empty() && key.hash != prevkey) {
ApplyStats(stats, prevkey, outputs);
ApplyHash(hash_obj, prevkey, outputs);
outputs.clear();
}
prevkey = key.hash;
outputs[key.n] = std::move(coin);
stats.coins_count++;
} else {
return error("%s: unable to read value", __func__);
}
pcursor->Next();
}
if (!outputs.empty()) {
ApplyStats(stats, prevkey, outputs);
ApplyHash(hash_obj, prevkey, outputs);
}
FinalizeHash(hash_obj, stats);
stats.nDiskSize = view->EstimateSize();
return true;
}
std::optional<CCoinsStats> ComputeUTXOStats(CoinStatsHashType hash_type, CCoinsView* view, node::BlockManager& blockman, const std::function<void()>& interruption_point)
{
CBlockIndex* pindex = WITH_LOCK(::cs_main, return blockman.LookupBlockIndex(view->GetBestBlock()));
CCoinsStats stats{Assert(pindex)->nHeight, pindex->GetBlockHash()};
bool success = [&]() -> bool {
switch (hash_type) {
case(CoinStatsHashType::HASH_SERIALIZED): {
CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
return ComputeUTXOStats(view, stats, ss, interruption_point);
}
case(CoinStatsHashType::MUHASH): {
MuHash3072 muhash;
return ComputeUTXOStats(view, stats, muhash, interruption_point);
}
case(CoinStatsHashType::NONE): {
return ComputeUTXOStats(view, stats, nullptr, interruption_point);
}
} // no default case, so the compiler can warn about missing cases
assert(false);
}();
if (!success) {
return std::nullopt;
}
return stats;
}
// The legacy hash serializes the hashBlock
static void PrepareHash(CHashWriter& ss, const CCoinsStats& stats)
{
ss << stats.hashBlock;
}
// MuHash does not need the prepare step
static void PrepareHash(MuHash3072& muhash, CCoinsStats& stats) {}
static void PrepareHash(std::nullptr_t, CCoinsStats& stats) {}
static void FinalizeHash(CHashWriter& ss, CCoinsStats& stats)
{
stats.hashSerialized = ss.GetHash();
}
static void FinalizeHash(MuHash3072& muhash, CCoinsStats& stats)
{
uint256 out;
muhash.Finalize(out);
stats.hashSerialized = out;
}
static void FinalizeHash(std::nullptr_t, CCoinsStats& stats) {}
} // namespace kernel
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