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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
// 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 <chain.h>
#include <coins.h>
#include <crypto/muhash.h>
#include <hash.h>
#include <logging.h>
#include <node/blockstorage.h>
#include <primitives/transaction.h>
#include <script/script.h>
#include <serialize.h>
#include <span.h>
#include <streams.h>
#include <sync.h>
#include <tinyformat.h>
#include <uint256.h>
#include <util/check.h>
#include <util/overflow.h>
#include <validation.h>
#include <cassert>
#include <iosfwd>
#include <iterator>
#include <map>
#include <memory>
#include <string>
#include <utility>
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 */;
}
template <typename T>
static void TxOutSer(T& ss, const COutPoint& outpoint, const Coin& coin)
{
ss << outpoint;
ss << static_cast<uint32_t>((coin.nHeight << 1) + coin.fCoinBase);
ss << coin.out;
}
static void ApplyCoinHash(HashWriter& ss, const COutPoint& outpoint, const Coin& coin)
{
TxOutSer(ss, outpoint, coin);
}
void ApplyCoinHash(MuHash3072& muhash, const COutPoint& outpoint, const Coin& coin)
{
DataStream ss{};
TxOutSer(ss, outpoint, coin);
muhash.Insert(MakeUCharSpan(ss));
}
void RemoveCoinHash(MuHash3072& muhash, const COutPoint& outpoint, const Coin& coin)
{
DataStream ss{};
TxOutSer(ss, outpoint, coin);
muhash.Remove(MakeUCharSpan(ss));
}
static void ApplyCoinHash(std::nullptr_t, const COutPoint& outpoint, const Coin& coin) {}
//! 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 ApplyHash(T& hash_obj, 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;
ApplyCoinHash(hash_obj, 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);
uint256 prevkey;
std::map<uint32_t, Coin> outputs;
while (pcursor->Valid()) {
if (interruption_point) 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): {
HashWriter ss{};
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;
}
static void FinalizeHash(HashWriter& 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
|
