Branch data Line data Source code
1 : : // Copyright (c) 2018-2022 The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #include <map>
6 : :
7 : : #include <clientversion.h>
8 : : #include <common/args.h>
9 : : #include <dbwrapper.h>
10 : : #include <hash.h>
11 : : #include <index/blockfilterindex.h>
12 : : #include <logging.h>
13 : : #include <node/blockstorage.h>
14 : : #include <undo.h>
15 : : #include <util/fs_helpers.h>
16 : : #include <validation.h>
17 [ + - ]: 2 :
18 [ + - ]: 2 : /* The index database stores three items for each block: the disk location of the encoded filter,
19 : : * its dSHA256 hash, and the header. Those belonging to blocks on the active chain are indexed by
20 : : * height, and those belonging to blocks that have been reorganized out of the active chain are
21 : : * indexed by block hash. This ensures that filter data for any block that becomes part of the
22 : : * active chain can always be retrieved, alleviating timing concerns.
23 : : *
24 : : * The filters themselves are stored in flat files and referenced by the LevelDB entries. This
25 : : * minimizes the amount of data written to LevelDB and keeps the database values constant size. The
26 : : * disk location of the next block filter to be written (represented as a FlatFilePos) is stored
27 : : * under the DB_FILTER_POS key.
28 : : *
29 : : * Keys for the height index have the type [DB_BLOCK_HEIGHT, uint32 (BE)]. The height is represented
30 : : * as big-endian so that sequential reads of filters by height are fast.
31 : : * Keys for the hash index have the type [DB_BLOCK_HASH, uint256].
32 : : */
33 : : constexpr uint8_t DB_BLOCK_HASH{'s'};
34 : : constexpr uint8_t DB_BLOCK_HEIGHT{'t'};
35 : : constexpr uint8_t DB_FILTER_POS{'P'};
36 : :
37 : : constexpr unsigned int MAX_FLTR_FILE_SIZE = 0x1000000; // 16 MiB
38 : : /** The pre-allocation chunk size for fltr?????.dat files */
39 : : constexpr unsigned int FLTR_FILE_CHUNK_SIZE = 0x100000; // 1 MiB
40 : : /** Maximum size of the cfheaders cache
41 : : * We have a limit to prevent a bug in filling this cache
42 : : * potentially turning into an OOM. At 2000 entries, this cache
43 : : * is big enough for a 2,000,000 length block chain, which
44 : : * we should be enough until ~2047. */
45 : : constexpr size_t CF_HEADERS_CACHE_MAX_SZ{2000};
46 : :
47 : : namespace {
48 : :
49 : : struct DBVal {
50 : : uint256 hash;
51 : : uint256 header;
52 : : FlatFilePos pos;
53 : :
54 : 0 : SERIALIZE_METHODS(DBVal, obj) { READWRITE(obj.hash, obj.header, obj.pos); }
55 : : };
56 : :
57 : : struct DBHeightKey {
58 : : int height;
59 : :
60 : 0 : explicit DBHeightKey(int height_in) : height(height_in) {}
61 : :
62 : : template<typename Stream>
63 : 0 : void Serialize(Stream& s) const
64 : : {
65 : 0 : ser_writedata8(s, DB_BLOCK_HEIGHT);
66 : 0 : ser_writedata32be(s, height);
67 : 0 : }
68 : :
69 : : template<typename Stream>
70 : 0 : void Unserialize(Stream& s)
71 : : {
72 : 0 : const uint8_t prefix{ser_readdata8(s)};
73 [ # # ]: 0 : if (prefix != DB_BLOCK_HEIGHT) {
74 [ # # ]: 2 : throw std::ios_base::failure("Invalid format for block filter index DB height key");
75 : : }
76 : 0 : height = ser_readdata32be(s);
77 : 0 : }
78 : : };
79 : :
80 : : struct DBHashKey {
81 : : uint256 hash;
82 : :
83 : 0 : explicit DBHashKey(const uint256& hash_in) : hash(hash_in) {}
84 : :
85 : 0 : SERIALIZE_METHODS(DBHashKey, obj) {
86 : 0 : uint8_t prefix{DB_BLOCK_HASH};
87 : 0 : READWRITE(prefix);
88 [ # # ]: 0 : if (prefix != DB_BLOCK_HASH) {
89 [ # # ]: 0 : throw std::ios_base::failure("Invalid format for block filter index DB hash key");
90 : : }
91 : :
92 : 0 : READWRITE(obj.hash);
93 : 0 : }
94 : : };
95 : :
96 : : }; // namespace
97 : :
98 : 2 : static std::map<BlockFilterType, BlockFilterIndex> g_filter_indexes;
99 : :
100 [ # # ]: 0 : BlockFilterIndex::BlockFilterIndex(std::unique_ptr<interfaces::Chain> chain, BlockFilterType filter_type,
101 : : size_t n_cache_size, bool f_memory, bool f_wipe)
102 [ # # # # : 0 : : BaseIndex(std::move(chain), BlockFilterTypeName(filter_type) + " block filter index")
# # ]
103 : 0 : , m_filter_type(filter_type)
104 : 0 : {
105 [ # # ]: 0 : const std::string& filter_name = BlockFilterTypeName(filter_type);
106 [ # # # # : 0 : if (filter_name.empty()) throw std::invalid_argument("unknown filter_type");
# # ]
107 : :
108 [ # # # # : 0 : fs::path path = gArgs.GetDataDirNet() / "indexes" / "blockfilter" / fs::u8path(filter_name);
# # # # #
# # # ]
109 [ # # ]: 0 : fs::create_directories(path);
110 : :
111 [ # # # # : 0 : m_db = std::make_unique<BaseIndex::DB>(path / "db", n_cache_size, f_memory, f_wipe);
# # ]
112 [ # # ]: 0 : m_filter_fileseq = std::make_unique<FlatFileSeq>(std::move(path), "fltr", FLTR_FILE_CHUNK_SIZE);
113 : 0 : }
114 : :
115 : 0 : bool BlockFilterIndex::CustomInit(const std::optional<interfaces::BlockKey>& block)
116 : : {
117 [ # # ]: 0 : if (!m_db->Read(DB_FILTER_POS, m_next_filter_pos)) {
118 : : // Check that the cause of the read failure is that the key does not exist. Any other errors
119 : : // indicate database corruption or a disk failure, and starting the index would cause
120 : : // further corruption.
121 [ # # ]: 0 : if (m_db->Exists(DB_FILTER_POS)) {
122 : 0 : return error("%s: Cannot read current %s state; index may be corrupted",
123 : 0 : __func__, GetName());
124 : : }
125 : :
126 : : // If the DB_FILTER_POS is not set, then initialize to the first location.
127 : 0 : m_next_filter_pos.nFile = 0;
128 : 0 : m_next_filter_pos.nPos = 0;
129 : 0 : }
130 : 0 : return true;
131 : 0 : }
132 : :
133 : 0 : bool BlockFilterIndex::CustomCommit(CDBBatch& batch)
134 : : {
135 : 0 : const FlatFilePos& pos = m_next_filter_pos;
136 : :
137 : : // Flush current filter file to disk.
138 [ # # ]: 0 : AutoFile file{m_filter_fileseq->Open(pos)};
139 [ # # # # ]: 0 : if (file.IsNull()) {
140 [ # # ]: 0 : return error("%s: Failed to open filter file %d", __func__, pos.nFile);
141 : : }
142 [ # # # # : 0 : if (!FileCommit(file.Get())) {
# # ]
143 [ # # ]: 0 : return error("%s: Failed to commit filter file %d", __func__, pos.nFile);
144 : : }
145 : :
146 [ # # ]: 0 : batch.Write(DB_FILTER_POS, pos);
147 : 0 : return true;
148 : 0 : }
149 : :
150 : 0 : bool BlockFilterIndex::ReadFilterFromDisk(const FlatFilePos& pos, const uint256& hash, BlockFilter& filter) const
151 : : {
152 [ # # ]: 0 : AutoFile filein{m_filter_fileseq->Open(pos, true)};
153 [ # # # # ]: 0 : if (filein.IsNull()) {
154 : 0 : return false;
155 : : }
156 : :
157 : : // Check that the hash of the encoded_filter matches the one stored in the db.
158 [ # # ]: 0 : uint256 block_hash;
159 : 0 : std::vector<uint8_t> encoded_filter;
160 : : try {
161 [ # # # # ]: 0 : filein >> block_hash >> encoded_filter;
162 [ # # # # : 0 : if (Hash(encoded_filter) != hash) return error("Checksum mismatch in filter decode.");
# # # # ]
163 [ # # # # ]: 0 : filter = BlockFilter(GetFilterType(), block_hash, std::move(encoded_filter), /*skip_decode_check=*/true);
164 [ # # ]: 0 : }
165 : : catch (const std::exception& e) {
166 [ # # ]: 0 : return error("%s: Failed to deserialize block filter from disk: %s", __func__, e.what());
167 [ # # # # ]: 0 : }
168 : :
169 : 0 : return true;
170 : 0 : }
171 : :
172 : 0 : size_t BlockFilterIndex::WriteFilterToDisk(FlatFilePos& pos, const BlockFilter& filter)
173 : : {
174 [ # # ]: 0 : assert(filter.GetFilterType() == GetFilterType());
175 : :
176 : 0 : size_t data_size =
177 : 0 : GetSerializeSize(filter.GetBlockHash(), CLIENT_VERSION) +
178 : 0 : GetSerializeSize(filter.GetEncodedFilter(), CLIENT_VERSION);
179 : :
180 : : // If writing the filter would overflow the file, flush and move to the next one.
181 [ # # ]: 0 : if (pos.nPos + data_size > MAX_FLTR_FILE_SIZE) {
182 [ # # ]: 0 : AutoFile last_file{m_filter_fileseq->Open(pos)};
183 [ # # # # ]: 0 : if (last_file.IsNull()) {
184 [ # # # # : 0 : LogPrintf("%s: Failed to open filter file %d\n", __func__, pos.nFile);
# # ]
185 : 0 : return 0;
186 : : }
187 [ # # # # : 0 : if (!TruncateFile(last_file.Get(), pos.nPos)) {
# # ]
188 [ # # # # : 0 : LogPrintf("%s: Failed to truncate filter file %d\n", __func__, pos.nFile);
# # ]
189 : 0 : return 0;
190 : : }
191 [ # # # # : 0 : if (!FileCommit(last_file.Get())) {
# # ]
192 [ # # # # : 0 : LogPrintf("%s: Failed to commit filter file %d\n", __func__, pos.nFile);
# # ]
193 : 0 : return 0;
194 : : }
195 : :
196 : 0 : pos.nFile++;
197 : 0 : pos.nPos = 0;
198 [ # # # ]: 0 : }
199 : :
200 : : // Pre-allocate sufficient space for filter data.
201 : : bool out_of_space;
202 : 0 : m_filter_fileseq->Allocate(pos, data_size, out_of_space);
203 [ # # ]: 0 : if (out_of_space) {
204 [ # # # # : 0 : LogPrintf("%s: out of disk space\n", __func__);
# # ]
205 : 0 : return 0;
206 : : }
207 : :
208 [ # # ]: 0 : AutoFile fileout{m_filter_fileseq->Open(pos)};
209 [ # # # # ]: 0 : if (fileout.IsNull()) {
210 [ # # # # : 0 : LogPrintf("%s: Failed to open filter file %d\n", __func__, pos.nFile);
# # ]
211 : 0 : return 0;
212 : : }
213 : :
214 [ # # # # : 0 : fileout << filter.GetBlockHash() << filter.GetEncodedFilter();
# # # # ]
215 : 0 : return data_size;
216 : 0 : }
217 : :
218 : 0 : bool BlockFilterIndex::CustomAppend(const interfaces::BlockInfo& block)
219 : : {
220 : 0 : CBlockUndo block_undo;
221 [ # # ]: 0 : uint256 prev_header;
222 : :
223 [ # # ]: 0 : if (block.height > 0) {
224 : : // pindex variable gives indexing code access to node internals. It
225 : : // will be removed in upcoming commit
226 [ # # # # : 0 : const CBlockIndex* pindex = WITH_LOCK(cs_main, return m_chainstate->m_blockman.LookupBlockIndex(block.hash));
# # ]
227 [ # # # # ]: 0 : if (!m_chainstate->m_blockman.UndoReadFromDisk(block_undo, *pindex)) {
228 : 0 : return false;
229 : : }
230 : :
231 [ # # ]: 0 : std::pair<uint256, DBVal> read_out;
232 [ # # # # : 0 : if (!m_db->Read(DBHeightKey(block.height - 1), read_out)) {
# # ]
233 : 0 : return false;
234 : : }
235 : :
236 [ # # ]: 0 : uint256 expected_block_hash = *Assert(block.prev_hash);
237 [ # # # # ]: 0 : if (read_out.first != expected_block_hash) {
238 [ # # ]: 0 : return error("%s: previous block header belongs to unexpected block %s; expected %s",
239 [ # # # # ]: 0 : __func__, read_out.first.ToString(), expected_block_hash.ToString());
240 : : }
241 : :
242 : 0 : prev_header = read_out.second.header;
243 : 0 : }
244 : :
245 [ # # # # ]: 0 : BlockFilter filter(m_filter_type, *Assert(block.data), block_undo);
246 : :
247 [ # # ]: 0 : size_t bytes_written = WriteFilterToDisk(m_next_filter_pos, filter);
248 [ # # ]: 0 : if (bytes_written == 0) return false;
249 : :
250 [ # # ]: 0 : std::pair<uint256, DBVal> value;
251 : 0 : value.first = block.hash;
252 [ # # ]: 0 : value.second.hash = filter.GetHash();
253 [ # # ]: 0 : value.second.header = filter.ComputeHeader(prev_header);
254 : 0 : value.second.pos = m_next_filter_pos;
255 : :
256 [ # # # # : 0 : if (!m_db->Write(DBHeightKey(block.height), value)) {
# # ]
257 : 0 : return false;
258 : : }
259 : :
260 : 0 : m_next_filter_pos.nPos += bytes_written;
261 : 0 : return true;
262 : 0 : }
263 : :
264 : 0 : [[nodiscard]] static bool CopyHeightIndexToHashIndex(CDBIterator& db_it, CDBBatch& batch,
265 : : const std::string& index_name,
266 : : int start_height, int stop_height)
267 : : {
268 : 0 : DBHeightKey key(start_height);
269 : 0 : db_it.Seek(key);
270 : :
271 [ # # ]: 0 : for (int height = start_height; height <= stop_height; ++height) {
272 [ # # # # ]: 0 : if (!db_it.GetKey(key) || key.height != height) {
273 : 0 : return error("%s: unexpected key in %s: expected (%c, %d)",
274 : 0 : __func__, index_name, DB_BLOCK_HEIGHT, height);
275 : : }
276 : :
277 : 0 : std::pair<uint256, DBVal> value;
278 [ # # ]: 0 : if (!db_it.GetValue(value)) {
279 : 0 : return error("%s: unable to read value in %s at key (%c, %d)",
280 : 0 : __func__, index_name, DB_BLOCK_HEIGHT, height);
281 : : }
282 : :
283 : 0 : batch.Write(DBHashKey(value.first), std::move(value.second));
284 : :
285 : 0 : db_it.Next();
286 : 0 : }
287 : 0 : return true;
288 : 0 : }
289 : :
290 : 0 : bool BlockFilterIndex::CustomRewind(const interfaces::BlockKey& current_tip, const interfaces::BlockKey& new_tip)
291 : : {
292 : 0 : CDBBatch batch(*m_db);
293 [ # # ]: 0 : std::unique_ptr<CDBIterator> db_it(m_db->NewIterator());
294 : :
295 : : // During a reorg, we need to copy all filters for blocks that are getting disconnected from the
296 : : // height index to the hash index so we can still find them when the height index entries are
297 : : // overwritten.
298 [ # # # # : 0 : if (!CopyHeightIndexToHashIndex(*db_it, batch, m_name, new_tip.height, current_tip.height)) {
# # ]
299 : 0 : return false;
300 : : }
301 : :
302 : : // The latest filter position gets written in Commit by the call to the BaseIndex::Rewind.
303 : : // But since this creates new references to the filter, the position should get updated here
304 : : // atomically as well in case Commit fails.
305 [ # # ]: 0 : batch.Write(DB_FILTER_POS, m_next_filter_pos);
306 [ # # # # ]: 0 : if (!m_db->WriteBatch(batch)) return false;
307 : :
308 : 0 : return true;
309 : 0 : }
310 : :
311 : 0 : static bool LookupOne(const CDBWrapper& db, const CBlockIndex* block_index, DBVal& result)
312 : : {
313 : : // First check if the result is stored under the height index and the value there matches the
314 : : // block hash. This should be the case if the block is on the active chain.
315 : 0 : std::pair<uint256, DBVal> read_out;
316 [ # # ]: 0 : if (!db.Read(DBHeightKey(block_index->nHeight), read_out)) {
317 : 0 : return false;
318 : : }
319 [ # # ]: 0 : if (read_out.first == block_index->GetBlockHash()) {
320 : 0 : result = std::move(read_out.second);
321 : 0 : return true;
322 : : }
323 : :
324 : : // If value at the height index corresponds to an different block, the result will be stored in
325 : : // the hash index.
326 : 0 : return db.Read(DBHashKey(block_index->GetBlockHash()), result);
327 : 0 : }
328 : :
329 : 0 : static bool LookupRange(CDBWrapper& db, const std::string& index_name, int start_height,
330 : : const CBlockIndex* stop_index, std::vector<DBVal>& results)
331 : : {
332 [ # # ]: 0 : if (start_height < 0) {
333 : 0 : return error("%s: start height (%d) is negative", __func__, start_height);
334 : : }
335 [ # # ]: 0 : if (start_height > stop_index->nHeight) {
336 : 0 : return error("%s: start height (%d) is greater than stop height (%d)",
337 : 0 : __func__, start_height, stop_index->nHeight);
338 : : }
339 : :
340 : 0 : size_t results_size = static_cast<size_t>(stop_index->nHeight - start_height + 1);
341 [ # # ]: 0 : std::vector<std::pair<uint256, DBVal>> values(results_size);
342 : :
343 [ # # ]: 0 : DBHeightKey key(start_height);
344 [ # # ]: 0 : std::unique_ptr<CDBIterator> db_it(db.NewIterator());
345 [ # # # # ]: 0 : db_it->Seek(DBHeightKey(start_height));
346 [ # # ]: 0 : for (int height = start_height; height <= stop_index->nHeight; ++height) {
347 [ # # # # : 0 : if (!db_it->Valid() || !db_it->GetKey(key) || key.height != height) {
# # # # #
# ]
348 : 0 : return false;
349 : : }
350 : :
351 : 0 : size_t i = static_cast<size_t>(height - start_height);
352 [ # # # # ]: 0 : if (!db_it->GetValue(values[i])) {
353 [ # # ]: 0 : return error("%s: unable to read value in %s at key (%c, %d)",
354 : 0 : __func__, index_name, DB_BLOCK_HEIGHT, height);
355 : : }
356 : :
357 [ # # ]: 0 : db_it->Next();
358 : 0 : }
359 : :
360 [ # # ]: 0 : results.resize(results_size);
361 : :
362 : : // Iterate backwards through block indexes collecting results in order to access the block hash
363 : : // of each entry in case we need to look it up in the hash index.
364 [ # # ]: 0 : for (const CBlockIndex* block_index = stop_index;
365 [ # # ]: 0 : block_index && block_index->nHeight >= start_height;
366 : 0 : block_index = block_index->pprev) {
367 : 0 : uint256 block_hash = block_index->GetBlockHash();
368 : :
369 : 0 : size_t i = static_cast<size_t>(block_index->nHeight - start_height);
370 [ # # ]: 0 : if (block_hash == values[i].first) {
371 : 0 : results[i] = std::move(values[i].second);
372 : 0 : continue;
373 : : }
374 : :
375 [ # # # # : 0 : if (!db.Read(DBHashKey(block_hash), results[i])) {
# # ]
376 [ # # ]: 0 : return error("%s: unable to read value in %s at key (%c, %s)",
377 [ # # ]: 0 : __func__, index_name, DB_BLOCK_HASH, block_hash.ToString());
378 : : }
379 : 0 : }
380 : :
381 : 0 : return true;
382 : 0 : }
383 : :
384 : 0 : bool BlockFilterIndex::LookupFilter(const CBlockIndex* block_index, BlockFilter& filter_out) const
385 : : {
386 : 0 : DBVal entry;
387 [ # # ]: 0 : if (!LookupOne(*m_db, block_index, entry)) {
388 : 0 : return false;
389 : : }
390 : :
391 : 0 : return ReadFilterFromDisk(entry.pos, entry.hash, filter_out);
392 : 0 : }
393 : :
394 : 0 : bool BlockFilterIndex::LookupFilterHeader(const CBlockIndex* block_index, uint256& header_out)
395 : : {
396 : 0 : LOCK(m_cs_headers_cache);
397 : :
398 : 0 : bool is_checkpoint{block_index->nHeight % CFCHECKPT_INTERVAL == 0};
399 : :
400 [ # # ]: 0 : if (is_checkpoint) {
401 : : // Try to find the block in the headers cache if this is a checkpoint height.
402 [ # # # # ]: 0 : auto header = m_headers_cache.find(block_index->GetBlockHash());
403 [ # # ]: 0 : if (header != m_headers_cache.end()) {
404 : 0 : header_out = header->second;
405 : 0 : return true;
406 : : }
407 : 0 : }
408 : :
409 [ # # ]: 0 : DBVal entry;
410 [ # # # # : 0 : if (!LookupOne(*m_db, block_index, entry)) {
# # ]
411 : 0 : return false;
412 : : }
413 : :
414 [ # # # # ]: 0 : if (is_checkpoint &&
415 : 0 : m_headers_cache.size() < CF_HEADERS_CACHE_MAX_SZ) {
416 : : // Add to the headers cache if this is a checkpoint height.
417 [ # # # # ]: 0 : m_headers_cache.emplace(block_index->GetBlockHash(), entry.header);
418 : 0 : }
419 : :
420 : 0 : header_out = entry.header;
421 : 0 : return true;
422 : 0 : }
423 : :
424 : 0 : bool BlockFilterIndex::LookupFilterRange(int start_height, const CBlockIndex* stop_index,
425 : : std::vector<BlockFilter>& filters_out) const
426 : : {
427 : 0 : std::vector<DBVal> entries;
428 [ # # # # : 0 : if (!LookupRange(*m_db, m_name, start_height, stop_index, entries)) {
# # ]
429 : 0 : return false;
430 : : }
431 : :
432 [ # # ]: 0 : filters_out.resize(entries.size());
433 : 0 : auto filter_pos_it = filters_out.begin();
434 [ # # ]: 0 : for (const auto& entry : entries) {
435 [ # # # # ]: 0 : if (!ReadFilterFromDisk(entry.pos, entry.hash, *filter_pos_it)) {
436 : 0 : return false;
437 : : }
438 : 0 : ++filter_pos_it;
439 : : }
440 : :
441 : 0 : return true;
442 : 0 : }
443 : :
444 : 0 : bool BlockFilterIndex::LookupFilterHashRange(int start_height, const CBlockIndex* stop_index,
445 : : std::vector<uint256>& hashes_out) const
446 : :
447 : : {
448 : 0 : std::vector<DBVal> entries;
449 [ # # # # : 0 : if (!LookupRange(*m_db, m_name, start_height, stop_index, entries)) {
# # ]
450 : 0 : return false;
451 : : }
452 : :
453 : 0 : hashes_out.clear();
454 [ # # ]: 0 : hashes_out.reserve(entries.size());
455 [ # # ]: 0 : for (const auto& entry : entries) {
456 [ # # ]: 0 : hashes_out.push_back(entry.hash);
457 : : }
458 : 0 : return true;
459 : 0 : }
460 : :
461 : 0 : BlockFilterIndex* GetBlockFilterIndex(BlockFilterType filter_type)
462 : : {
463 : 0 : auto it = g_filter_indexes.find(filter_type);
464 [ # # ]: 0 : return it != g_filter_indexes.end() ? &it->second : nullptr;
465 : : }
466 : :
467 : 0 : void ForEachBlockFilterIndex(std::function<void (BlockFilterIndex&)> fn)
468 : : {
469 [ # # ]: 0 : for (auto& entry : g_filter_indexes) fn(entry.second);
470 : 0 : }
471 : :
472 : 0 : bool InitBlockFilterIndex(std::function<std::unique_ptr<interfaces::Chain>()> make_chain, BlockFilterType filter_type,
473 : : size_t n_cache_size, bool f_memory, bool f_wipe)
474 : : {
475 [ # # ]: 0 : auto result = g_filter_indexes.emplace(std::piecewise_construct,
476 : 0 : std::forward_as_tuple(filter_type),
477 : 0 : std::forward_as_tuple(make_chain(), filter_type,
478 : : n_cache_size, f_memory, f_wipe));
479 : 0 : return result.second;
480 : 0 : }
481 : :
482 : 0 : bool DestroyBlockFilterIndex(BlockFilterType filter_type)
483 : : {
484 : 0 : return g_filter_indexes.erase(filter_type);
485 : : }
486 : :
487 : 0 : void DestroyAllBlockFilterIndexes()
488 : : {
489 : 0 : g_filter_indexes.clear();
490 : 0 : }
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