aboutsummaryrefslogtreecommitdiff
path: root/src/node/coinstats.cpp
blob: 268580c6e60d8527c1c1dfbe4b079e508d14dea7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
// 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 <crypto/muhash.h>
#include <hash.h>
#include <serialize.h>
#include <uint256.h>
#include <util/system.h>
#include <validation.h>

#include <map>

// Database-independent metric indicating the UTXO set size
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 ApplyHash(CCoinsStats& stats, CHashWriter& ss, const uint256& hash, const std::map<uint32_t, Coin>& outputs, std::map<uint32_t, Coin>::const_iterator 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(CCoinsStats& stats, std::nullptr_t, const uint256& hash, const std::map<uint32_t, Coin>& outputs, std::map<uint32_t, Coin>::const_iterator it) {}

static void ApplyHash(CCoinsStats& stats, MuHash3072& muhash, const uint256& hash, const std::map<uint32_t, Coin>& outputs, std::map<uint32_t, Coin>::const_iterator it)
{
    COutPoint outpoint = COutPoint(hash, it->first);
    Coin coin = it->second;

    CDataStream ss(SER_DISK, PROTOCOL_VERSION);
    ss << outpoint;
    ss << static_cast<uint32_t>(coin.nHeight * 2 + coin.fCoinBase);
    ss << coin.out;
    muhash.Insert(MakeUCharSpan(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.
template <typename T>
static void ApplyStats(CCoinsStats& stats, T& hash_obj, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
{
    assert(!outputs.empty());
    stats.nTransactions++;
    for (auto it = outputs.begin(); it != outputs.end(); ++it) {
        ApplyHash(stats, hash_obj, hash, outputs, it);

        stats.nTransactionOutputs++;
        stats.nTotalAmount += it->second.out.nValue;
        stats.nBogoSize += GetBogoSize(it->second.out.scriptPubKey);
    }
}

//! Calculate statistics about the unspent transaction output set
template <typename T>
static bool GetUTXOStats(CCoinsView* view, BlockManager& blockman, 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);
        assert(std::addressof(g_chainman.m_blockman) == std::addressof(blockman));
        stats.nHeight = blockman.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, BlockManager& blockman, 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, blockman, stats, ss, interruption_point);
    }
    case(CoinStatsHashType::MUHASH): {
        MuHash3072 muhash;
        return GetUTXOStats(view, blockman, stats, muhash, interruption_point);
    }
    case(CoinStatsHashType::NONE): {
        return GetUTXOStats(view, blockman, stats, nullptr, 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, 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) {}