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coinstats.cpp
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coinstats.cpp
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// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2019 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 <util/system.h>
#include <validation.h>
#include <map>
#include <boost/thread.hpp>
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.GetHeight() * 2 +
outputs.begin()->second.IsCoinBase());
stats.nTransactions++;
for (const auto &output : outputs) {
ss << VARINT(output.first + 1);
ss << output.second.GetTxOut().scriptPubKey;
ss << VARINT(output.second.GetTxOut().nValue / SATOSHI,
VarIntMode::NONNEGATIVE_SIGNED);
stats.nTransactionOutputs++;
stats.nTotalAmount += output.second.GetTxOut().nValue;
stats.nBogoSize +=
32 /* txid */ + 4 /* vout index */ + 4 /* height + coinbase */ +
8 /* amount */ + 2 /* scriptPubKey len */ +
output.second.GetTxOut().scriptPubKey.size() /* scriptPubKey */;
}
ss << VARINT(0u);
}
//! Calculate statistics about the unspent transaction output set
bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats) {
stats = CCoinsStats();
std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
assert(pcursor);
CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
stats.hashBlock = pcursor->GetBestBlock();
{
LOCK(cs_main);
stats.nHeight = LookupBlockIndex(stats.hashBlock)->nHeight;
}
ss << stats.hashBlock;
uint256 prevkey;
std::map<uint32_t, Coin> outputs;
while (pcursor->Valid()) {
boost::this_thread::interruption_point();
COutPoint key;
Coin coin;
if (pcursor->GetKey(key) && pcursor->GetValue(coin)) {
if (!outputs.empty() && key.GetTxId() != prevkey) {
ApplyStats(stats, ss, prevkey, outputs);
outputs.clear();
}
prevkey = key.GetTxId();
outputs[key.GetN()] = std::move(coin);
stats.coins_count++;
} else {
return error("%s: unable to read value", __func__);
}
pcursor->Next();
}
if (!outputs.empty()) {
ApplyStats(stats, ss, prevkey, outputs);
}
stats.hashSerialized = ss.GetHash();
stats.nDiskSize = view->EstimateSize();
return true;
}