aboutsummaryrefslogtreecommitdiff
path: root/src/index/coinstatsindex.cpp
blob: 99a1310c9ec0adbcb07fc3c094f44a629b7263e2 (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
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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
// Copyright (c) 2020-2021 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 <chainparams.h>
#include <coins.h>
#include <crypto/muhash.h>
#include <index/coinstatsindex.h>
#include <kernel/coinstats.h>
#include <node/blockstorage.h>
#include <serialize.h>
#include <txdb.h>
#include <undo.h>
#include <util/system.h>
#include <validation.h>

using kernel::CCoinsStats;
using kernel::GetBogoSize;
using kernel::TxOutSer;

using node::ReadBlockFromDisk;
using node::UndoReadFromDisk;

static constexpr uint8_t DB_BLOCK_HASH{'s'};
static constexpr uint8_t DB_BLOCK_HEIGHT{'t'};
static constexpr uint8_t DB_MUHASH{'M'};

namespace {

struct DBVal {
    uint256 muhash;
    uint64_t transaction_output_count;
    uint64_t bogo_size;
    CAmount total_amount;
    CAmount total_subsidy;
    CAmount total_unspendable_amount;
    CAmount total_prevout_spent_amount;
    CAmount total_new_outputs_ex_coinbase_amount;
    CAmount total_coinbase_amount;
    CAmount total_unspendables_genesis_block;
    CAmount total_unspendables_bip30;
    CAmount total_unspendables_scripts;
    CAmount total_unspendables_unclaimed_rewards;

    SERIALIZE_METHODS(DBVal, obj)
    {
        READWRITE(obj.muhash);
        READWRITE(obj.transaction_output_count);
        READWRITE(obj.bogo_size);
        READWRITE(obj.total_amount);
        READWRITE(obj.total_subsidy);
        READWRITE(obj.total_unspendable_amount);
        READWRITE(obj.total_prevout_spent_amount);
        READWRITE(obj.total_new_outputs_ex_coinbase_amount);
        READWRITE(obj.total_coinbase_amount);
        READWRITE(obj.total_unspendables_genesis_block);
        READWRITE(obj.total_unspendables_bip30);
        READWRITE(obj.total_unspendables_scripts);
        READWRITE(obj.total_unspendables_unclaimed_rewards);
    }
};

struct DBHeightKey {
    int height;

    explicit DBHeightKey(int height_in) : height(height_in) {}

    template <typename Stream>
    void Serialize(Stream& s) const
    {
        ser_writedata8(s, DB_BLOCK_HEIGHT);
        ser_writedata32be(s, height);
    }

    template <typename Stream>
    void Unserialize(Stream& s)
    {
        const uint8_t prefix{ser_readdata8(s)};
        if (prefix != DB_BLOCK_HEIGHT) {
            throw std::ios_base::failure("Invalid format for coinstatsindex DB height key");
        }
        height = ser_readdata32be(s);
    }
};

struct DBHashKey {
    uint256 block_hash;

    explicit DBHashKey(const uint256& hash_in) : block_hash(hash_in) {}

    SERIALIZE_METHODS(DBHashKey, obj)
    {
        uint8_t prefix{DB_BLOCK_HASH};
        READWRITE(prefix);
        if (prefix != DB_BLOCK_HASH) {
            throw std::ios_base::failure("Invalid format for coinstatsindex DB hash key");
        }

        READWRITE(obj.block_hash);
    }
};

}; // namespace

std::unique_ptr<CoinStatsIndex> g_coin_stats_index;

CoinStatsIndex::CoinStatsIndex(std::unique_ptr<interfaces::Chain> chain, size_t n_cache_size, bool f_memory, bool f_wipe)
    : BaseIndex(std::move(chain))
{
    fs::path path{gArgs.GetDataDirNet() / "indexes" / "coinstats"};
    fs::create_directories(path);

    m_db = std::make_unique<CoinStatsIndex::DB>(path / "db", n_cache_size, f_memory, f_wipe);
}

bool CoinStatsIndex::CustomAppend(const interfaces::BlockInfo& block)
{
    CBlockUndo block_undo;
    const CAmount block_subsidy{GetBlockSubsidy(block.height, Params().GetConsensus())};
    m_total_subsidy += block_subsidy;

    // Ignore genesis block
    if (block.height > 0) {
        // pindex variable gives indexing code access to node internals. It
        // will be removed in upcoming commit
        const CBlockIndex* pindex = WITH_LOCK(cs_main, return m_chainstate->m_blockman.LookupBlockIndex(block.hash));
        if (!UndoReadFromDisk(block_undo, pindex)) {
            return false;
        }

        std::pair<uint256, DBVal> read_out;
        if (!m_db->Read(DBHeightKey(block.height - 1), read_out)) {
            return false;
        }

        uint256 expected_block_hash{*Assert(block.prev_hash)};
        if (read_out.first != expected_block_hash) {
            LogPrintf("WARNING: previous block header belongs to unexpected block %s; expected %s\n",
                      read_out.first.ToString(), expected_block_hash.ToString());

            if (!m_db->Read(DBHashKey(expected_block_hash), read_out)) {
                return error("%s: previous block header not found; expected %s",
                             __func__, expected_block_hash.ToString());
            }
        }

        // TODO: Deduplicate BIP30 related code
        bool is_bip30_block{(block.height == 91722 && block.hash == uint256S("0x00000000000271a2dc26e7667f8419f2e15416dc6955e5a6c6cdf3f2574dd08e")) ||
                            (block.height == 91812 && block.hash == uint256S("0x00000000000af0aed4792b1acee3d966af36cf5def14935db8de83d6f9306f2f"))};

        // Add the new utxos created from the block
        assert(block.data);
        for (size_t i = 0; i < block.data->vtx.size(); ++i) {
            const auto& tx{block.data->vtx.at(i)};

            // Skip duplicate txid coinbase transactions (BIP30).
            if (is_bip30_block && tx->IsCoinBase()) {
                m_total_unspendable_amount += block_subsidy;
                m_total_unspendables_bip30 += block_subsidy;
                continue;
            }

            for (uint32_t j = 0; j < tx->vout.size(); ++j) {
                const CTxOut& out{tx->vout[j]};
                Coin coin{out, block.height, tx->IsCoinBase()};
                COutPoint outpoint{tx->GetHash(), j};

                // Skip unspendable coins
                if (coin.out.scriptPubKey.IsUnspendable()) {
                    m_total_unspendable_amount += coin.out.nValue;
                    m_total_unspendables_scripts += coin.out.nValue;
                    continue;
                }

                m_muhash.Insert(MakeUCharSpan(TxOutSer(outpoint, coin)));

                if (tx->IsCoinBase()) {
                    m_total_coinbase_amount += coin.out.nValue;
                } else {
                    m_total_new_outputs_ex_coinbase_amount += coin.out.nValue;
                }

                ++m_transaction_output_count;
                m_total_amount += coin.out.nValue;
                m_bogo_size += GetBogoSize(coin.out.scriptPubKey);
            }

            // The coinbase tx has no undo data since no former output is spent
            if (!tx->IsCoinBase()) {
                const auto& tx_undo{block_undo.vtxundo.at(i - 1)};

                for (size_t j = 0; j < tx_undo.vprevout.size(); ++j) {
                    Coin coin{tx_undo.vprevout[j]};
                    COutPoint outpoint{tx->vin[j].prevout.hash, tx->vin[j].prevout.n};

                    m_muhash.Remove(MakeUCharSpan(TxOutSer(outpoint, coin)));

                    m_total_prevout_spent_amount += coin.out.nValue;

                    --m_transaction_output_count;
                    m_total_amount -= coin.out.nValue;
                    m_bogo_size -= GetBogoSize(coin.out.scriptPubKey);
                }
            }
        }
    } else {
        // genesis block
        m_total_unspendable_amount += block_subsidy;
        m_total_unspendables_genesis_block += block_subsidy;
    }

    // If spent prevouts + block subsidy are still a higher amount than
    // new outputs + coinbase + current unspendable amount this means
    // the miner did not claim the full block reward. Unclaimed block
    // rewards are also unspendable.
    const CAmount unclaimed_rewards{(m_total_prevout_spent_amount + m_total_subsidy) - (m_total_new_outputs_ex_coinbase_amount + m_total_coinbase_amount + m_total_unspendable_amount)};
    m_total_unspendable_amount += unclaimed_rewards;
    m_total_unspendables_unclaimed_rewards += unclaimed_rewards;

    std::pair<uint256, DBVal> value;
    value.first = block.hash;
    value.second.transaction_output_count = m_transaction_output_count;
    value.second.bogo_size = m_bogo_size;
    value.second.total_amount = m_total_amount;
    value.second.total_subsidy = m_total_subsidy;
    value.second.total_unspendable_amount = m_total_unspendable_amount;
    value.second.total_prevout_spent_amount = m_total_prevout_spent_amount;
    value.second.total_new_outputs_ex_coinbase_amount = m_total_new_outputs_ex_coinbase_amount;
    value.second.total_coinbase_amount = m_total_coinbase_amount;
    value.second.total_unspendables_genesis_block = m_total_unspendables_genesis_block;
    value.second.total_unspendables_bip30 = m_total_unspendables_bip30;
    value.second.total_unspendables_scripts = m_total_unspendables_scripts;
    value.second.total_unspendables_unclaimed_rewards = m_total_unspendables_unclaimed_rewards;

    uint256 out;
    m_muhash.Finalize(out);
    value.second.muhash = out;

    // Intentionally do not update DB_MUHASH here so it stays in sync with
    // DB_BEST_BLOCK, and the index is not corrupted if there is an unclean shutdown.
    return m_db->Write(DBHeightKey(block.height), value);
}

static bool CopyHeightIndexToHashIndex(CDBIterator& db_it, CDBBatch& batch,
                                       const std::string& index_name,
                                       int start_height, int stop_height)
{
    DBHeightKey key{start_height};
    db_it.Seek(key);

    for (int height = start_height; height <= stop_height; ++height) {
        if (!db_it.GetKey(key) || key.height != height) {
            return error("%s: unexpected key in %s: expected (%c, %d)",
                         __func__, index_name, DB_BLOCK_HEIGHT, height);
        }

        std::pair<uint256, DBVal> value;
        if (!db_it.GetValue(value)) {
            return error("%s: unable to read value in %s at key (%c, %d)",
                         __func__, index_name, DB_BLOCK_HEIGHT, height);
        }

        batch.Write(DBHashKey(value.first), std::move(value.second));

        db_it.Next();
    }
    return true;
}

bool CoinStatsIndex::CustomRewind(const interfaces::BlockKey& current_tip, const interfaces::BlockKey& new_tip)
{
    CDBBatch batch(*m_db);
    std::unique_ptr<CDBIterator> db_it(m_db->NewIterator());

    // During a reorg, we need to copy all hash digests for blocks that are
    // getting disconnected from the height index to the hash index so we can
    // still find them when the height index entries are overwritten.
    if (!CopyHeightIndexToHashIndex(*db_it, batch, m_name, new_tip.height, current_tip.height)) {
        return false;
    }

    if (!m_db->WriteBatch(batch)) return false;

    {
        LOCK(cs_main);
        const CBlockIndex* iter_tip{m_chainstate->m_blockman.LookupBlockIndex(current_tip.hash)};
        const CBlockIndex* new_tip_index{m_chainstate->m_blockman.LookupBlockIndex(new_tip.hash)};
        const auto& consensus_params{Params().GetConsensus()};

        do {
            CBlock block;

            if (!ReadBlockFromDisk(block, iter_tip, consensus_params)) {
                return error("%s: Failed to read block %s from disk",
                             __func__, iter_tip->GetBlockHash().ToString());
            }

            ReverseBlock(block, iter_tip);

            iter_tip = iter_tip->GetAncestor(iter_tip->nHeight - 1);
        } while (new_tip_index != iter_tip);
    }

    return true;
}

static bool LookUpOne(const CDBWrapper& db, const interfaces::BlockKey& block, DBVal& result)
{
    // First check if the result is stored under the height index and the value
    // there matches the block hash. This should be the case if the block is on
    // the active chain.
    std::pair<uint256, DBVal> read_out;
    if (!db.Read(DBHeightKey(block.height), read_out)) {
        return false;
    }
    if (read_out.first == block.hash) {
        result = std::move(read_out.second);
        return true;
    }

    // If value at the height index corresponds to an different block, the
    // result will be stored in the hash index.
    return db.Read(DBHashKey(block.hash), result);
}

std::optional<CCoinsStats> CoinStatsIndex::LookUpStats(const CBlockIndex& block_index) const
{
    CCoinsStats stats{block_index.nHeight, block_index.GetBlockHash()};
    stats.index_used = true;

    DBVal entry;
    if (!LookUpOne(*m_db, {block_index.GetBlockHash(), block_index.nHeight}, entry)) {
        return std::nullopt;
    }

    stats.hashSerialized = entry.muhash;
    stats.nTransactionOutputs = entry.transaction_output_count;
    stats.nBogoSize = entry.bogo_size;
    stats.total_amount = entry.total_amount;
    stats.total_subsidy = entry.total_subsidy;
    stats.total_unspendable_amount = entry.total_unspendable_amount;
    stats.total_prevout_spent_amount = entry.total_prevout_spent_amount;
    stats.total_new_outputs_ex_coinbase_amount = entry.total_new_outputs_ex_coinbase_amount;
    stats.total_coinbase_amount = entry.total_coinbase_amount;
    stats.total_unspendables_genesis_block = entry.total_unspendables_genesis_block;
    stats.total_unspendables_bip30 = entry.total_unspendables_bip30;
    stats.total_unspendables_scripts = entry.total_unspendables_scripts;
    stats.total_unspendables_unclaimed_rewards = entry.total_unspendables_unclaimed_rewards;

    return stats;
}

bool CoinStatsIndex::CustomInit(const std::optional<interfaces::BlockKey>& block)
{
    if (!m_db->Read(DB_MUHASH, m_muhash)) {
        // Check that the cause of the read failure is that the key does not
        // exist. Any other errors indicate database corruption or a disk
        // failure, and starting the index would cause further corruption.
        if (m_db->Exists(DB_MUHASH)) {
            return error("%s: Cannot read current %s state; index may be corrupted",
                         __func__, GetName());
        }
    }

    if (block) {
        DBVal entry;
        if (!LookUpOne(*m_db, *block, entry)) {
            return error("%s: Cannot read current %s state; index may be corrupted",
                         __func__, GetName());
        }

        uint256 out;
        m_muhash.Finalize(out);
        if (entry.muhash != out) {
            return error("%s: Cannot read current %s state; index may be corrupted",
                         __func__, GetName());
        }

        m_transaction_output_count = entry.transaction_output_count;
        m_bogo_size = entry.bogo_size;
        m_total_amount = entry.total_amount;
        m_total_subsidy = entry.total_subsidy;
        m_total_unspendable_amount = entry.total_unspendable_amount;
        m_total_prevout_spent_amount = entry.total_prevout_spent_amount;
        m_total_new_outputs_ex_coinbase_amount = entry.total_new_outputs_ex_coinbase_amount;
        m_total_coinbase_amount = entry.total_coinbase_amount;
        m_total_unspendables_genesis_block = entry.total_unspendables_genesis_block;
        m_total_unspendables_bip30 = entry.total_unspendables_bip30;
        m_total_unspendables_scripts = entry.total_unspendables_scripts;
        m_total_unspendables_unclaimed_rewards = entry.total_unspendables_unclaimed_rewards;
    }

    return true;
}

bool CoinStatsIndex::CustomCommit(CDBBatch& batch)
{
    // DB_MUHASH should always be committed in a batch together with DB_BEST_BLOCK
    // to prevent an inconsistent state of the DB.
    batch.Write(DB_MUHASH, m_muhash);
    return true;
}

// Reverse a single block as part of a reorg
bool CoinStatsIndex::ReverseBlock(const CBlock& block, const CBlockIndex* pindex)
{
    CBlockUndo block_undo;
    std::pair<uint256, DBVal> read_out;

    const CAmount block_subsidy{GetBlockSubsidy(pindex->nHeight, Params().GetConsensus())};
    m_total_subsidy -= block_subsidy;

    // Ignore genesis block
    if (pindex->nHeight > 0) {
        if (!UndoReadFromDisk(block_undo, pindex)) {
            return false;
        }

        if (!m_db->Read(DBHeightKey(pindex->nHeight - 1), read_out)) {
            return false;
        }

        uint256 expected_block_hash{pindex->pprev->GetBlockHash()};
        if (read_out.first != expected_block_hash) {
            LogPrintf("WARNING: previous block header belongs to unexpected block %s; expected %s\n",
                      read_out.first.ToString(), expected_block_hash.ToString());

            if (!m_db->Read(DBHashKey(expected_block_hash), read_out)) {
                return error("%s: previous block header not found; expected %s",
                             __func__, expected_block_hash.ToString());
            }
        }
    }

    // Remove the new UTXOs that were created from the block
    for (size_t i = 0; i < block.vtx.size(); ++i) {
        const auto& tx{block.vtx.at(i)};

        for (uint32_t j = 0; j < tx->vout.size(); ++j) {
            const CTxOut& out{tx->vout[j]};
            COutPoint outpoint{tx->GetHash(), j};
            Coin coin{out, pindex->nHeight, tx->IsCoinBase()};

            // Skip unspendable coins
            if (coin.out.scriptPubKey.IsUnspendable()) {
                m_total_unspendable_amount -= coin.out.nValue;
                m_total_unspendables_scripts -= coin.out.nValue;
                continue;
            }

            m_muhash.Remove(MakeUCharSpan(TxOutSer(outpoint, coin)));

            if (tx->IsCoinBase()) {
                m_total_coinbase_amount -= coin.out.nValue;
            } else {
                m_total_new_outputs_ex_coinbase_amount -= coin.out.nValue;
            }

            --m_transaction_output_count;
            m_total_amount -= coin.out.nValue;
            m_bogo_size -= GetBogoSize(coin.out.scriptPubKey);
        }

        // The coinbase tx has no undo data since no former output is spent
        if (!tx->IsCoinBase()) {
            const auto& tx_undo{block_undo.vtxundo.at(i - 1)};

            for (size_t j = 0; j < tx_undo.vprevout.size(); ++j) {
                Coin coin{tx_undo.vprevout[j]};
                COutPoint outpoint{tx->vin[j].prevout.hash, tx->vin[j].prevout.n};

                m_muhash.Insert(MakeUCharSpan(TxOutSer(outpoint, coin)));

                m_total_prevout_spent_amount -= coin.out.nValue;

                m_transaction_output_count++;
                m_total_amount += coin.out.nValue;
                m_bogo_size += GetBogoSize(coin.out.scriptPubKey);
            }
        }
    }

    const CAmount unclaimed_rewards{(m_total_new_outputs_ex_coinbase_amount + m_total_coinbase_amount + m_total_unspendable_amount) - (m_total_prevout_spent_amount + m_total_subsidy)};
    m_total_unspendable_amount -= unclaimed_rewards;
    m_total_unspendables_unclaimed_rewards -= unclaimed_rewards;

    // Check that the rolled back internal values are consistent with the DB read out
    uint256 out;
    m_muhash.Finalize(out);
    Assert(read_out.second.muhash == out);

    Assert(m_transaction_output_count == read_out.second.transaction_output_count);
    Assert(m_total_amount == read_out.second.total_amount);
    Assert(m_bogo_size == read_out.second.bogo_size);
    Assert(m_total_subsidy == read_out.second.total_subsidy);
    Assert(m_total_unspendable_amount == read_out.second.total_unspendable_amount);
    Assert(m_total_prevout_spent_amount == read_out.second.total_prevout_spent_amount);
    Assert(m_total_new_outputs_ex_coinbase_amount == read_out.second.total_new_outputs_ex_coinbase_amount);
    Assert(m_total_coinbase_amount == read_out.second.total_coinbase_amount);
    Assert(m_total_unspendables_genesis_block == read_out.second.total_unspendables_genesis_block);
    Assert(m_total_unspendables_bip30 == read_out.second.total_unspendables_bip30);
    Assert(m_total_unspendables_scripts == read_out.second.total_unspendables_scripts);
    Assert(m_total_unspendables_unclaimed_rewards == read_out.second.total_unspendables_unclaimed_rewards);

    return true;
}