1 // Copyright (c) 2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2019 The Bitcoin Core developers
3 // Distributed under the MIT software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5
6 #include <node/coinstats.h>
7
8 #include <coins.h>
9 #include <hash.h>
10 #include <serialize.h>
11 #include <validation.h>
12 #include <uint256.h>
13 #include <util/system.h>
14
15 #include <map>
16
ApplyStats(CCoinsStats & stats,CHashWriter & ss,const uint256 & hash,const std::map<uint32_t,Coin> & outputs)17 static void ApplyStats(CCoinsStats &stats, CHashWriter& ss, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
18 {
19 assert(!outputs.empty());
20 ss << hash;
21 ss << VARINT((outputs.begin()->second.nHeight << 2) + (outputs.begin()->second.fCoinBase ? 1u : 0u) + (outputs.begin()->second.fCoinStake ? 2u : 0u));
22 stats.nTransactions++;
23 for (const auto& output : outputs) {
24 ss << VARINT(output.first + 1);
25 ss << *(const CScriptBase*)(&output.second.out.scriptPubKey);
26 ss << VARINT_MODE(output.second.out.nValue, VarIntMode::NONNEGATIVE_SIGNED);
27 stats.nTransactionOutputs++;
28 stats.nTotalAmount += output.second.out.nValue;
29 stats.nBogoSize += 32 /* txid */ + 4 /* vout index */ + 4 /* height + coinbase */ + 8 /* amount */ +
30 2 /* scriptPubKey len */ + output.second.out.scriptPubKey.size() /* scriptPubKey */;
31 }
32 ss << VARINT(0u);
33 }
34
35 //! Calculate statistics about the unspent transaction output set
GetUTXOStats(CCoinsView * view,CCoinsStats & stats)36 bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
37 {
38 stats = CCoinsStats();
39 std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
40 assert(pcursor);
41
42 CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
43 stats.hashBlock = pcursor->GetBestBlock();
44 {
45 LOCK(cs_main);
46 stats.nHeight = LookupBlockIndex(stats.hashBlock)->nHeight;
47 }
48 ss << stats.hashBlock;
49 uint256 prevkey;
50 std::map<uint32_t, Coin> outputs;
51 while (pcursor->Valid()) {
52 COutPoint key;
53 Coin coin;
54 if (pcursor->GetKey(key) && pcursor->GetValue(coin)) {
55 if (!outputs.empty() && key.hash != prevkey) {
56 ApplyStats(stats, ss, prevkey, outputs);
57 outputs.clear();
58 }
59 prevkey = key.hash;
60 outputs[key.n] = std::move(coin);
61 stats.coins_count++;
62 } else {
63 return error("%s: unable to read value", __func__);
64 }
65 pcursor->Next();
66 }
67 if (!outputs.empty()) {
68 ApplyStats(stats, ss, prevkey, outputs);
69 }
70 stats.hashSerialized = ss.GetHash();
71 stats.nDiskSize = view->EstimateSize();
72 return true;
73 }
74