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// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 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/coinstats.h>
#include <coins.h>
#include <hash.h>
#include <serialize.h>
#include <uint256.h>
#include <util/system.h>
#include <validation.h>
#include <map>
static uint64_t GetBogoSize(const CScript& scriptPubKey)
{
return 32 /* txid */ +
4 /* vout index */ +
4 /* height + coinbase */ +
8 /* amount */ +
2 /* scriptPubKey len */ +
scriptPubKey.size() /* scriptPubKey */;
}
static void ApplyStats(CCoinsStats& stats, CHashWriter& ss, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
{
assert(!outputs.empty());
ss << hash;
ss << VARINT(outputs.begin()->second.nHeight * 2 + outputs.begin()->second.fCoinBase ? 1u : 0u);
stats.nTransactions++;
for (const auto& output : outputs) {
ss << VARINT(output.first + 1);
ss << output.second.out.scriptPubKey;
ss << VARINT_MODE(output.second.out.nValue, VarIntMode::NONNEGATIVE_SIGNED);
stats.nTransactionOutputs++;
stats.nTotalAmount += output.second.out.nValue;
stats.nBogoSize += GetBogoSize(output.second.out.scriptPubKey);
}
ss << VARINT(0u);
}
//! Calculate statistics about the unspent transaction output set
template <typename T>
static bool GetUTXOStats(CCoinsView* view, CCoinsStats& stats, T hash_obj, const std::function<void()>& interruption_point)
{
stats = CCoinsStats();
std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
assert(pcursor);
stats.hashBlock = pcursor->GetBestBlock();
{
LOCK(cs_main);
stats.nHeight = LookupBlockIndex(stats.hashBlock)->nHeight;
}
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, 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, hash_obj, prevkey, outputs);
}
FinalizeHash(hash_obj, stats);
stats.nDiskSize = view->EstimateSize();
return true;
}
bool GetUTXOStats(CCoinsView* view, CCoinsStats& stats, CoinStatsHashType hash_type, const std::function<void()>& interruption_point)
{
switch (hash_type) {
case(CoinStatsHashType::HASH_SERIALIZED): {
CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
return GetUTXOStats(view, stats, ss, interruption_point);
}
} // no default case, so the compiler can warn about missing cases
assert(false);
}
// The legacy hash serializes the hashBlock
static void PrepareHash(CHashWriter& ss, CCoinsStats& stats)
{
ss << stats.hashBlock;
}
static void FinalizeHash(CHashWriter& ss, CCoinsStats& stats)
{
stats.hashSerialized = ss.GetHash();
}
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