/bitcoin/src/dbwrapper.cpp

Source
// Copyright (c) 2012-present 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 <dbwrapper.h>

#include <leveldb/cache.h>
#include <leveldb/db.h>
#include <leveldb/env.h>
#include <leveldb/filter_policy.h>
#include <leveldb/helpers/memenv/memenv.h>
#include <leveldb/iterator.h>
#include <leveldb/options.h>
#include <leveldb/slice.h>
#include <leveldb/status.h>
#include <leveldb/write_batch.h>
#include <random.h>
#include <serialize.h>
#include <span.h>
#include <streams.h>
#include <util/byte_units.h>
#include <util/fs.h>
#include <util/fs_helpers.h>
#include <util/log.h>
#include <util/obfuscation.h>
#include <util/strencodings.h>

#include <algorithm>
#include <cassert>
#include <cstdarg>
#include <cstdint>
#include <cstdio>
#include <memory>
#include <optional>
#include <utility>

static auto CharCast(const std::byte* data) { return reinterpret_cast<const char*>(data); }

bool DestroyDB(const std::string& path_str)
{
    return leveldb::DestroyDB(path_str, {}).ok();
}

/** Handle database error by throwing dbwrapper_error exception.
 */
static void HandleError(const leveldb::Status& status)
{
    if (status.ok())
        return;
    const std::string errmsg = "Fatal LevelDB error: " + status.ToString();
    LogError("%s", errmsg);
    LogInfo("You can use -debug=leveldb to get more complete diagnostic messages");
    throw dbwrapper_error(errmsg);
}

class CBitcoinLevelDBLogger : public leveldb::Logger {
public:
    // This code is adapted from posix_logger.h, which is why it is using vsprintf.
    // Please do not do this in normal code
    void Logv(const char * format, va_list ap) override {
            if (!util::log::ShouldDebugLog(BCLog::LEVELDB)) {
                return;
            }
            char buffer[500];
            for (int iter = 0; iter < 2; iter++) {
                char* base;
                int bufsize;
                if (iter == 0) {
                    bufsize = sizeof(buffer);
                    base = buffer;
                }
                else {
                    bufsize = 30000;
                    base = new char[bufsize];
                }
                char* p = base;
                char* limit = base + bufsize;

                // Print the message
                if (p < limit) {
                    va_list backup_ap;
                    va_copy(backup_ap, ap);
                    // Do not use vsnprintf elsewhere in bitcoin source code, see above.
                    p += vsnprintf(p, limit - p, format, backup_ap);
                    va_end(backup_ap);
                }

                // Truncate to available space if necessary
                if (p >= limit) {
                    if (iter == 0) {
                        continue;       // Try again with larger buffer
                    }
                    else {
                        p = limit - 1;
                    }
                }

                // Add newline if necessary
                if (p == base || p[-1] != '\n') {
                    *p++ = '\n';
                }

                assert(p <= limit);
                base[std::min(bufsize - 1, (int)(p - base))] = '\0';
                LogDebug(BCLog::LEVELDB, "%s\n", util::RemoveSuffixView(base, "\n"));
                if (base != buffer) {
                    delete[] base;
                }
                break;
            }
    }
};

static void SetMaxOpenFiles(leveldb::Options *options) {
    // On most platforms the default setting of max_open_files (which is 1000)
    // is optimal. On Windows using a large file count is OK because the handles
    // do not interfere with select() loops. On 64-bit Unix hosts this value is
    // also OK, because up to that amount LevelDB will use an mmap
    // implementation that does not use extra file descriptors (the fds are
    // closed after being mmap'ed).
    //
    // Increasing the value beyond the default is dangerous because LevelDB will
    // fall back to a non-mmap implementation when the file count is too large.
    // On 32-bit Unix host we should decrease the value because the handles use
    // up real fds, and we want to avoid fd exhaustion issues.
    //
    // See PR #12495 for further discussion.

    int default_open_files = options->max_open_files;
#ifndef WIN32
    if (sizeof(void*) < 8) {
        options->max_open_files = 64;
    }
#endif
    LogDebug(BCLog::LEVELDB, "LevelDB using max_open_files=%d (default=%d)\n",
             options->max_open_files, default_open_files);
}

static leveldb::Options GetOptions(size_t nCacheSize)
{
    leveldb::Options options;
    options.block_cache = leveldb::NewLRUCache(nCacheSize / 2);
    options.write_buffer_size = nCacheSize / 4; // up to two write buffers may be held in memory simultaneously
    options.filter_policy = leveldb::NewBloomFilterPolicy(10);
    options.compression = leveldb::kNoCompression;
    options.info_log = new CBitcoinLevelDBLogger();
    if (leveldb::kMajorVersion > 1 || (leveldb::kMajorVersion == 1 && leveldb::kMinorVersion >= 16)) {
        // LevelDB versions before 1.16 consider short writes to be corruption. Only trigger error
        // on corruption in later versions.
        options.paranoid_checks = true;
    }
    SetMaxOpenFiles(&options);
    return options;
}

struct CDBBatch::WriteBatchImpl {
    leveldb::WriteBatch batch;
};

CDBBatch::CDBBatch(const CDBWrapper& _parent)
    : parent{_parent},
      m_impl_batch{std::make_unique<CDBBatch::WriteBatchImpl>()}
{
    m_key_scratch.reserve(DBWRAPPER_PREALLOC_KEY_SIZE);
    m_value_scratch.reserve(DBWRAPPER_PREALLOC_VALUE_SIZE);
    Clear();
};

CDBBatch::~CDBBatch() = default;

void CDBBatch::Clear()
{
    m_impl_batch->batch.Clear();
    assert(m_key_scratch.empty());
    assert(m_value_scratch.empty());
}

void CDBBatch::WriteImpl(std::span<const std::byte> key, DataStream& value)
{
    leveldb::Slice slKey(CharCast(key.data()), key.size());
    dbwrapper_private::GetObfuscation(parent)(value);
    leveldb::Slice slValue(CharCast(value.data()), value.size());
    m_impl_batch->batch.Put(slKey, slValue);
}

void CDBBatch::EraseImpl(std::span<const std::byte> key)
{
    leveldb::Slice slKey(CharCast(key.data()), key.size());
    m_impl_batch->batch.Delete(slKey);
}

size_t CDBBatch::ApproximateSize() const
{
    return m_impl_batch->batch.ApproximateSize();
}

struct LevelDBContext {
    //! custom environment this database is using (may be nullptr in case of default environment)
    leveldb::Env* penv;

    //! database options used
    leveldb::Options options;

    //! options used when reading from the database
    leveldb::ReadOptions readoptions;

    //! options used when iterating over values of the database
    leveldb::ReadOptions iteroptions;

    //! options used when writing to the database
    leveldb::WriteOptions writeoptions;

    //! options used when sync writing to the database
    leveldb::WriteOptions syncoptions;

    //! the database itself
    leveldb::DB* pdb;
};

CDBWrapper::CDBWrapper(const DBParams& params)
    : m_db_context{std::make_unique<LevelDBContext>()}, m_name{fs::PathToString(params.path.stem())}
{
    DBContext().penv = nullptr;
    DBContext().readoptions.verify_checksums = true;
    DBContext().iteroptions.verify_checksums = true;
    DBContext().iteroptions.fill_cache = false;
    DBContext().syncoptions.sync = true;
    DBContext().options = GetOptions(params.cache_bytes);
    DBContext().options.create_if_missing = true;
    DBContext().options.max_file_size = params.max_file_size;
    assert(!(params.testing_env && params.memory_only));
    if (params.testing_env) {
        DBContext().options.env = params.testing_env;
    } else if (params.memory_only) {
        DBContext().penv = leveldb::NewMemEnv(leveldb::Env::Default());
        DBContext().options.env = DBContext().penv;
    }
    if (!params.memory_only) {
        if (params.wipe_data) {
            LogInfo("Wiping LevelDB in %s", fs::PathToString(params.path));
            leveldb::Status result = leveldb::DestroyDB(fs::PathToString(params.path), DBContext().options);
            HandleError(result);
        }
        if (!params.testing_env) {
            TryCreateDirectories(params.path);
        }
        LogInfo("Opening LevelDB in %s", fs::PathToString(params.path));
    }
    // PathToString() return value is safe to pass to leveldb open function,
    // because on POSIX leveldb passes the byte string directly to ::open(), and
    // on Windows it converts from UTF-8 to UTF-16 before calling ::CreateFileW
    // (see env_posix.cc and env_windows.cc).
    leveldb::Status status = leveldb::DB::Open(DBContext().options, fs::PathToString(params.path), &DBContext().pdb);
    HandleError(status);
    LogInfo("Opened LevelDB successfully");

    if (params.options.force_compact) {
        LogInfo("Starting database compaction of %s", fs::PathToString(params.path));
        CompactFull();
        LogInfo("Finished database compaction of %s", fs::PathToString(params.path));
    }

    if (!Read(OBFUSCATION_KEY, m_obfuscation) && params.obfuscate && IsEmpty()) {
        // Generate and write the new obfuscation key.
        const Obfuscation obfuscation{FastRandomContext{}.randbytes<Obfuscation::KEY_SIZE>()};
        assert(!m_obfuscation); // Make sure the key is written without obfuscation.
        Write(OBFUSCATION_KEY, obfuscation);
        m_obfuscation = obfuscation;
        LogInfo("Wrote new obfuscation key for %s: %s", fs::PathToString(params.path), m_obfuscation.HexKey());
    }
    LogInfo("Using obfuscation key for %s: %s", fs::PathToString(params.path), m_obfuscation.HexKey());
}

CDBWrapper::~CDBWrapper()
{
    delete DBContext().pdb;
    DBContext().pdb = nullptr;
    delete DBContext().options.filter_policy;
    DBContext().options.filter_policy = nullptr;
    delete DBContext().options.info_log;
    DBContext().options.info_log = nullptr;
    delete DBContext().options.block_cache;
    DBContext().options.block_cache = nullptr;
    delete DBContext().penv;
    DBContext().options.env = nullptr;
}

void CDBWrapper::WriteBatch(CDBBatch& batch, bool fSync)
{
    const bool log_memory = util::log::ShouldDebugLog(BCLog::LEVELDB);
    double mem_before = 0;
    if (log_memory) {
        mem_before = DynamicMemoryUsage() / double(1_MiB);
    }
    leveldb::Status status = DBContext().pdb->Write(fSync ? DBContext().syncoptions : DBContext().writeoptions, &batch.m_impl_batch->batch);
    HandleError(status);
    if (log_memory) {
        double mem_after{DynamicMemoryUsage() / double(1_MiB)};
        LogDebug(BCLog::LEVELDB, "WriteBatch memory usage: db=%s, before=%.1fMiB, after=%.1fMiB\n",
                 m_name, mem_before, mem_after);
    }
}

std::optional<std::string> CDBWrapper::GetProperty(const std::string& property) const
{
    if (std::string value; DBContext().pdb->GetProperty(property, &value)) return value;
    return std::nullopt;
}

void CDBWrapper::CompactFull() { DBContext().pdb->CompactRange(nullptr, nullptr); }

size_t CDBWrapper::DynamicMemoryUsage() const
{
    std::optional<size_t> parsed;
    if (auto memory{GetProperty("leveldb.approximate-memory-usage")}; !memory || !(parsed = ToIntegral<size_t>(*memory))) {
        LogDebug(BCLog::LEVELDB, "Failed to get approximate-memory-usage property\n");
        return 0;
    }
    return parsed.value();
}

std::optional<std::string> CDBWrapper::ReadImpl(std::span<const std::byte> key) const
{
    leveldb::Slice slKey(CharCast(key.data()), key.size());
    std::string strValue;
    leveldb::Status status = DBContext().pdb->Get(DBContext().readoptions, slKey, &strValue);
    if (!status.ok()) {
        if (status.IsNotFound())
            return std::nullopt;
        LogError("LevelDB read failure: %s", status.ToString());
        HandleError(status);
    }
    return strValue;
}

bool CDBWrapper::ExistsImpl(std::span<const std::byte> key) const
{
    leveldb::Slice slKey(CharCast(key.data()), key.size());

    std::string strValue;
    leveldb::Status status = DBContext().pdb->Get(DBContext().readoptions, slKey, &strValue);
    if (!status.ok()) {
        if (status.IsNotFound())
            return false;
        LogError("LevelDB read failure: %s", status.ToString());
        HandleError(status);
    }
    return true;
}

size_t CDBWrapper::EstimateSizeImpl(std::span<const std::byte> key1, std::span<const std::byte> key2) const
{
    leveldb::Slice slKey1(CharCast(key1.data()), key1.size());
    leveldb::Slice slKey2(CharCast(key2.data()), key2.size());
    uint64_t size = 0;
    leveldb::Range range(slKey1, slKey2);
    DBContext().pdb->GetApproximateSizes(&range, 1, &size);
    return size;
}

bool CDBWrapper::IsEmpty()
{
    std::unique_ptr<CDBIterator> it(NewIterator());
    it->SeekToFirst();
    return !(it->Valid());
}

struct CDBIterator::IteratorImpl {
    const std::unique_ptr<leveldb::Iterator> iter;

    explicit IteratorImpl(leveldb::Iterator* _iter) : iter{_iter} {}
};

CDBIterator::CDBIterator(const CDBWrapper& _parent, std::unique_ptr<IteratorImpl> _piter) : parent(_parent),
                                                                                            m_impl_iter(std::move(_piter))
{
    m_scratch.reserve(DBWRAPPER_PREALLOC_KEY_SIZE);
}

CDBIterator* CDBWrapper::NewIterator()
{
    return new CDBIterator{*this, std::make_unique<CDBIterator::IteratorImpl>(DBContext().pdb->NewIterator(DBContext().iteroptions))};
}

void CDBIterator::SeekImpl(std::span<const std::byte> key)
{
    leveldb::Slice slKey(CharCast(key.data()), key.size());
    m_impl_iter->iter->Seek(slKey);
}

std::span<const std::byte> CDBIterator::GetKeyImpl() const
{
    // The returned span borrows from the current iterator entry and is only
    // valid until the iterator is advanced.
    return MakeByteSpan(m_impl_iter->iter->key());
}

std::span<const std::byte> CDBIterator::GetValueImpl() const
{
    return MakeByteSpan(m_impl_iter->iter->value());
}

CDBIterator::~CDBIterator() = default;
bool CDBIterator::Valid() const { return m_impl_iter->iter->Valid(); }
void CDBIterator::SeekToFirst() { m_impl_iter->iter->SeekToFirst(); }
void CDBIterator::Next() { m_impl_iter->iter->Next(); }

namespace dbwrapper_private {

const Obfuscation& GetObfuscation(const CDBWrapper& w)
{
    return w.m_obfuscation;
}

} // namespace dbwrapper_private

Coverage Report

Created: 2026-07-14 18:13

Line	Count	Source
1		// Copyright (c) 2012-present 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 <dbwrapper.h>
6
7		#include <leveldb/cache.h>
8		#include <leveldb/db.h>
9		#include <leveldb/env.h>
10		#include <leveldb/filter_policy.h>
11		#include <leveldb/helpers/memenv/memenv.h>
12		#include <leveldb/iterator.h>
13		#include <leveldb/options.h>
14		#include <leveldb/slice.h>
15		#include <leveldb/status.h>
16		#include <leveldb/write_batch.h>
17		#include <random.h>
18		#include <serialize.h>
19		#include <span.h>
20		#include <streams.h>
21		#include <util/byte_units.h>
22		#include <util/fs.h>
23		#include <util/fs_helpers.h>
24		#include <util/log.h>
25		#include <util/obfuscation.h>
26		#include <util/strencodings.h>
27
28		#include <algorithm>
29		#include <cassert>
30		#include <cstdarg>
31		#include <cstdint>
32		#include <cstdio>
33		#include <memory>
34		#include <optional>
35		#include <utility>
36
37	126M	static auto CharCast(const std::byte* data) { return reinterpret_cast<const char*>(data); }
38
39		bool DestroyDB(const std::string& path_str)
40	0	{
41	0	return leveldb::DestroyDB(path_str, {}).ok();
42	0	}
43
44		/** Handle database error by throwing dbwrapper_error exception.
45		*/
46		static void HandleError(const leveldb::Status& status)
47	831k	{
48	831k	if (status.ok()) Branch (48:9): [True: 831k, False: 0]
49	831k	return;
50	0	const std::string errmsg = "Fatal LevelDB error: " + status.ToString();
51	0	LogError("%s", errmsg);
52	0	LogInfo("You can use -debug=leveldb to get more complete diagnostic messages");
53	0	throw dbwrapper_error(errmsg);
54	831k	}
55
56		class CBitcoinLevelDBLogger : public leveldb::Logger {
57		public:
58		// This code is adapted from posix_logger.h, which is why it is using vsprintf.
59		// Please do not do this in normal code
60	145	void Logv(const char * format, va_list ap) override {
61	145	if (!util::log::ShouldDebugLog(BCLog::LEVELDB)) { Branch (61:17): [True: 145, False: 0]
62	145	return;
63	145	}
64	0	char buffer[500];
65	0	for (int iter = 0; iter < 2; iter++) { Branch (65:32): [True: 0, False: 0]
66	0	char* base;
67	0	int bufsize;
68	0	if (iter == 0) { Branch (68:21): [True: 0, False: 0]
69	0	bufsize = sizeof(buffer);
70	0	base = buffer;
71	0	}
72	0	else {
73	0	bufsize = 30000;
74	0	base = new char[bufsize];
75	0	}
76	0	char* p = base;
77	0	char* limit = base + bufsize;
78
79		// Print the message
80	0	if (p < limit) { Branch (80:21): [True: 0, False: 0]
81	0	va_list backup_ap;
82	0	va_copy(backup_ap, ap);
83		// Do not use vsnprintf elsewhere in bitcoin source code, see above.
84	0	p += vsnprintf(p, limit - p, format, backup_ap);
85	0	va_end(backup_ap);
86	0	}
87
88		// Truncate to available space if necessary
89	0	if (p >= limit) { Branch (89:21): [True: 0, False: 0]
90	0	if (iter == 0) { Branch (90:25): [True: 0, False: 0]
91	0	continue; // Try again with larger buffer
92	0	}
93	0	else {
94	0	p = limit - 1;
95	0	}
96	0	}
97
98		// Add newline if necessary
99	0	if (p == base \|\| p[-1] != '\n') { Branch (99:21): [True: 0, False: 0] Branch (99:34): [True: 0, False: 0]
100	0	*p++ = '\n';
101	0	}
102
103	0	assert(p <= limit); Branch (103:17): [True: 0, False: 0]
104	0	base[std::min(bufsize - 1, (int)(p - base))] = '\0';
105	0	LogDebug(BCLog::LEVELDB, "%s\n", util::RemoveSuffixView(base, "\n"));
106	0	if (base != buffer) { Branch (106:21): [True: 0, False: 0]
107	0	delete[] base;
108	0	}
109	0	break;
110	0	}
111	0	}
112		};
113
114	81	static void SetMaxOpenFiles(leveldb::Options *options) {
115		// On most platforms the default setting of max_open_files (which is 1000)
116		// is optimal. On Windows using a large file count is OK because the handles
117		// do not interfere with select() loops. On 64-bit Unix hosts this value is
118		// also OK, because up to that amount LevelDB will use an mmap
119		// implementation that does not use extra file descriptors (the fds are
120		// closed after being mmap'ed).
121		//
122		// Increasing the value beyond the default is dangerous because LevelDB will
123		// fall back to a non-mmap implementation when the file count is too large.
124		// On 32-bit Unix host we should decrease the value because the handles use
125		// up real fds, and we want to avoid fd exhaustion issues.
126		//
127		// See PR #12495 for further discussion.
128
129	81	int default_open_files = options->max_open_files;
130	81	#ifndef WIN32
131	81	if (sizeof(void*) < 8) { Branch (131:9): [Folded - Ignored]
132	0	options->max_open_files = 64;
133	0	}
134	81	#endif
135	81	LogDebug(BCLog::LEVELDB, "LevelDB using max_open_files=%d (default=%d)\n",
136	81	options->max_open_files, default_open_files);
137	81	}
138
139		static leveldb::Options GetOptions(size_t nCacheSize)
140	81	{
141	81	leveldb::Options options;
142	81	options.block_cache = leveldb::NewLRUCache(nCacheSize / 2);
143	81	options.write_buffer_size = nCacheSize / 4; // up to two write buffers may be held in memory simultaneously
144	81	options.filter_policy = leveldb::NewBloomFilterPolicy(10);
145	81	options.compression = leveldb::kNoCompression;
146	81	options.info_log = new CBitcoinLevelDBLogger();
147	81	if (leveldb::kMajorVersion > 1 \|\| (leveldb::kMajorVersion == 1 && leveldb::kMinorVersion >= 16)) { Branch (147:9): [Folded - Ignored] Branch (147:40): [Folded - Ignored] Branch (147:71): [Folded - Ignored]
148		// LevelDB versions before 1.16 consider short writes to be corruption. Only trigger error
149		// on corruption in later versions.
150	81	options.paranoid_checks = true;
151	81	}
152	81	SetMaxOpenFiles(&options);
153	81	return options;
154	81	}
155
156		struct CDBBatch::WriteBatchImpl {
157		leveldb::WriteBatch batch;
158		};
159
160		CDBBatch::CDBBatch(const CDBWrapper& _parent)
161	831k	: parent{_parent},
162	831k	m_impl_batch{std::make_unique<CDBBatch::WriteBatchImpl>()}
163	831k	{
164	831k	m_key_scratch.reserve(DBWRAPPER_PREALLOC_KEY_SIZE);
165	831k	m_value_scratch.reserve(DBWRAPPER_PREALLOC_VALUE_SIZE);
166	831k	Clear();
167	831k	};
168
169	831k	CDBBatch::~CDBBatch() = default;
170
171		void CDBBatch::Clear()
172	831k	{
173	831k	m_impl_batch->batch.Clear();
174	831k	assert(m_key_scratch.empty()); Branch (174:5): [True: 831k, False: 0]
175	831k	assert(m_value_scratch.empty()); Branch (175:5): [True: 831k, False: 0]
176	831k	}
177
178		void CDBBatch::WriteImpl(std::span<const std::byte> key, DataStream& value)
179	61.7M	{
180	61.7M	leveldb::Slice slKey(CharCast(key.data()), key.size());
181	61.7M	dbwrapper_private::GetObfuscation(parent)(value);
182	61.7M	leveldb::Slice slValue(CharCast(value.data()), value.size());
183	61.7M	m_impl_batch->batch.Put(slKey, slValue);
184	61.7M	}
185
186		void CDBBatch::EraseImpl(std::span<const std::byte> key)
187	633k	{
188	633k	leveldb::Slice slKey(CharCast(key.data()), key.size());
189	633k	m_impl_batch->batch.Delete(slKey);
190	633k	}
191
192		size_t CDBBatch::ApproximateSize() const
193	30.3M	{
194	30.3M	return m_impl_batch->batch.ApproximateSize();
195	30.3M	}
196
197		struct LevelDBContext {
198		//! custom environment this database is using (may be nullptr in case of default environment)
199		leveldb::Env* penv;
200
201		//! database options used
202		leveldb::Options options;
203
204		//! options used when reading from the database
205		leveldb::ReadOptions readoptions;
206
207		//! options used when iterating over values of the database
208		leveldb::ReadOptions iteroptions;
209
210		//! options used when writing to the database
211		leveldb::WriteOptions writeoptions;
212
213		//! options used when sync writing to the database
214		leveldb::WriteOptions syncoptions;
215
216		//! the database itself
217		leveldb::DB* pdb;
218		};
219
220		CDBWrapper::CDBWrapper(const DBParams& params)
221	81	: m_db_context{std::make_unique<LevelDBContext>()}, m_name{fs::PathToString(params.path.stem())}
222	81	{
223	81	DBContext().penv = nullptr;
224	81	DBContext().readoptions.verify_checksums = true;
225	81	DBContext().iteroptions.verify_checksums = true;
226	81	DBContext().iteroptions.fill_cache = false;
227	81	DBContext().syncoptions.sync = true;
228	81	DBContext().options = GetOptions(params.cache_bytes);
229	81	DBContext().options.create_if_missing = true;
230	81	DBContext().options.max_file_size = params.max_file_size;
231	81	assert(!(params.testing_env && params.memory_only)); Branch (231:5): [True: 0, False: 81] Branch (231:5): [True: 0, False: 0] Branch (231:5): [True: 81, False: 0]
232	81	if (params.testing_env) { Branch (232:9): [True: 0, False: 81]
233	0	DBContext().options.env = params.testing_env;
234	81	} else if (params.memory_only) { Branch (234:16): [True: 0, False: 81]
235	0	DBContext().penv = leveldb::NewMemEnv(leveldb::Env::Default());
236	0	DBContext().options.env = DBContext().penv;
237	0	}
238	81	if (!params.memory_only) { Branch (238:9): [True: 81, False: 0]
239	81	if (params.wipe_data) { Branch (239:13): [True: 0, False: 81]
240	0	LogInfo("Wiping LevelDB in %s", fs::PathToString(params.path));
241	0	leveldb::Status result = leveldb::DestroyDB(fs::PathToString(params.path), DBContext().options);
242	0	HandleError(result);
243	0	}
244	81	if (!params.testing_env) { Branch (244:13): [True: 81, False: 0]
245	81	TryCreateDirectories(params.path);
246	81	}
247	81	LogInfo("Opening LevelDB in %s", fs::PathToString(params.path));
248	81	}
249		// PathToString() return value is safe to pass to leveldb open function,
250		// because on POSIX leveldb passes the byte string directly to ::open(), and
251		// on Windows it converts from UTF-8 to UTF-16 before calling ::CreateFileW
252		// (see env_posix.cc and env_windows.cc).
253	81	leveldb::Status status = leveldb::DB::Open(DBContext().options, fs::PathToString(params.path), &DBContext().pdb);
254	81	HandleError(status);
255	81	LogInfo("Opened LevelDB successfully");
256
257	81	if (params.options.force_compact) { Branch (257:9): [True: 0, False: 81]
258	0	LogInfo("Starting database compaction of %s", fs::PathToString(params.path));
259	0	CompactFull();
260	0	LogInfo("Finished database compaction of %s", fs::PathToString(params.path));
261	0	}
262
263	81	if (!Read(OBFUSCATION_KEY, m_obfuscation) && params.obfuscate && IsEmpty()) { Branch (263:9): [True: 81, False: 0] Branch (263:50): [True: 27, False: 54] Branch (263:70): [True: 27, False: 0]
264		// Generate and write the new obfuscation key.
265	27	const Obfuscation obfuscation{FastRandomContext{}.randbytes<Obfuscation::KEY_SIZE>()};
266	27	assert(!m_obfuscation); // Make sure the key is written without obfuscation. Branch (266:9): [True: 27, False: 0]
267	27	Write(OBFUSCATION_KEY, obfuscation);
268	27	m_obfuscation = obfuscation;
269	27	LogInfo("Wrote new obfuscation key for %s: %s", fs::PathToString(params.path), m_obfuscation.HexKey());
270	27	}
271	81	LogInfo("Using obfuscation key for %s: %s", fs::PathToString(params.path), m_obfuscation.HexKey());
272	81	}
273
274		CDBWrapper::~CDBWrapper()
275	450k	{
276	450k	delete DBContext().pdb;
277	450k	DBContext().pdb = nullptr;
278	450k	delete DBContext().options.filter_policy;
279	450k	DBContext().options.filter_policy = nullptr;
280	450k	delete DBContext().options.info_log;
281	450k	DBContext().options.info_log = nullptr;
282	450k	delete DBContext().options.block_cache;
283	450k	DBContext().options.block_cache = nullptr;
284	450k	delete DBContext().penv;
285	450k	DBContext().options.env = nullptr;
286	450k	}
287
288		void CDBWrapper::WriteBatch(CDBBatch& batch, bool fSync)
289	831k	{
290	831k	const bool log_memory = util::log::ShouldDebugLog(BCLog::LEVELDB);
291	831k	double mem_before = 0;
292	831k	if (log_memory) { Branch (292:9): [True: 0, False: 831k]
293	0	mem_before = DynamicMemoryUsage() / double(1_MiB);
294	0	}
295	831k	leveldb::Status status = DBContext().pdb->Write(fSync ? DBContext().syncoptions : DBContext().writeoptions, &batch.m_impl_batch->batch); Branch (295:53): [True: 305k, False: 525k]
296	831k	HandleError(status);
297	831k	if (log_memory) { Branch (297:9): [True: 0, False: 831k]
298	0	double mem_after{DynamicMemoryUsage() / double(1_MiB)};
299	0	LogDebug(BCLog::LEVELDB, "WriteBatch memory usage: db=%s, before=%.1fMiB, after=%.1fMiB\n",
300	0	m_name, mem_before, mem_after);
301	0	}
302	831k	}
303
304		std::optional<std::string> CDBWrapper::GetProperty(const std::string& property) const
305	0	{
306	0	if (std::string value; DBContext().pdb->GetProperty(property, &value)) return value; Branch (306:28): [True: 0, False: 0]
307	0	return std::nullopt;
308	0	}
309
310	16	void CDBWrapper::CompactFull() { DBContext().pdb->CompactRange(nullptr, nullptr); }
311
312		size_t CDBWrapper::DynamicMemoryUsage() const
313	0	{
314	0	std::optional<size_t> parsed;
315	0	if (auto memory{GetProperty("leveldb.approximate-memory-usage")}; !memory \|\| !(parsed = ToIntegral<size_t>(*memory))) { Branch (315:71): [True: 0, False: 0] Branch (315:71): [True: 0, False: 0] Branch (315:82): [True: 0, False: 0]
316	0	LogDebug(BCLog::LEVELDB, "Failed to get approximate-memory-usage property\n");
317	0	return 0;
318	0	}
319	0	return parsed.value();
320	0	}
321
322		std::optional<std::string> CDBWrapper::ReadImpl(std::span<const std::byte> key) const
323	2.52M	{
324	2.52M	leveldb::Slice slKey(CharCast(key.data()), key.size());
325	2.52M	std::string strValue;
326	2.52M	leveldb::Status status = DBContext().pdb->Get(DBContext().readoptions, slKey, &strValue);
327	2.52M	if (!status.ok()) { Branch (327:9): [True: 2.34M, False: 178k]
328	2.34M	if (status.IsNotFound()) Branch (328:13): [True: 2.34M, False: 18.4E]
329	2.34M	return std::nullopt;
330	18.4E	LogError("LevelDB read failure: %s", status.ToString());
331	18.4E	HandleError(status);
332	18.4E	}
333	177k	return strValue;
334	2.52M	}
335
336		bool CDBWrapper::ExistsImpl(std::span<const std::byte> key) const
337	54	{
338	54	leveldb::Slice slKey(CharCast(key.data()), key.size());
339
340	54	std::string strValue;
341	54	leveldb::Status status = DBContext().pdb->Get(DBContext().readoptions, slKey, &strValue);
342	54	if (!status.ok()) { Branch (342:9): [True: 54, False: 0]
343	54	if (status.IsNotFound()) Branch (343:13): [True: 54, False: 0]
344	54	return false;
345	0	LogError("LevelDB read failure: %s", status.ToString());
346	0	HandleError(status);
347	0	}
348	0	return true;
349	54	}
350
351		size_t CDBWrapper::EstimateSizeImpl(std::span<const std::byte> key1, std::span<const std::byte> key2) const
352	0	{
353	0	leveldb::Slice slKey1(CharCast(key1.data()), key1.size());
354	0	leveldb::Slice slKey2(CharCast(key2.data()), key2.size());
355	0	uint64_t size = 0;
356	0	leveldb::Range range(slKey1, slKey2);
357	0	DBContext().pdb->GetApproximateSizes(&range, 1, &size);
358	0	return size;
359	0	}
360
361		bool CDBWrapper::IsEmpty()
362	27	{
363	27	std::unique_ptr<CDBIterator> it(NewIterator());
364	27	it->SeekToFirst();
365	27	return !(it->Valid());
366	27	}
367
368		struct CDBIterator::IteratorImpl {
369		const std::unique_ptr<leveldb::Iterator> iter;
370
371	24.8k	explicit IteratorImpl(leveldb::Iterator* _iter) : iter{_iter} {}
372		};
373
374	24.8k	CDBIterator::CDBIterator(const CDBWrapper& _parent, std::unique_ptr<IteratorImpl> _piter) : parent(_parent),
375	24.8k	m_impl_iter(std::move(_piter))
376	24.8k	{
377	24.8k	m_scratch.reserve(DBWRAPPER_PREALLOC_KEY_SIZE);
378	24.8k	}
379
380		CDBIterator* CDBWrapper::NewIterator()
381	24.8k	{
382	24.8k	return new CDBIterator{*this, std::make_unique<CDBIterator::IteratorImpl>(DBContext().pdb->NewIterator(DBContext().iteroptions))};
383	24.8k	}
384
385		void CDBIterator::SeekImpl(std::span<const std::byte> key)
386	24.8k	{
387	24.8k	leveldb::Slice slKey(CharCast(key.data()), key.size());
388	24.8k	m_impl_iter->iter->Seek(slKey);
389	24.8k	}
390
391		std::span<const std::byte> CDBIterator::GetKeyImpl() const
392	369k	{
393		// The returned span borrows from the current iterator entry and is only
394		// valid until the iterator is advanced.
395	369k	return MakeByteSpan(m_impl_iter->iter->key());
396	369k	}
397
398		std::span<const std::byte> CDBIterator::GetValueImpl() const
399	369k	{
400	369k	return MakeByteSpan(m_impl_iter->iter->value());
401	369k	}
402
403	24.8k	CDBIterator::~CDBIterator() = default;
404	347k	bool CDBIterator::Valid() const { return m_impl_iter->iter->Valid(); }
405	27	void CDBIterator::SeekToFirst() { m_impl_iter->iter->SeekToFirst(); }
406	347k	void CDBIterator::Next() { m_impl_iter->iter->Next(); }
407
408		namespace dbwrapper_private {
409
410		const Obfuscation& GetObfuscation(const CDBWrapper& w)
411	62.1M	{
412	62.1M	return w.m_obfuscation;
413	62.1M	}
414
415		} // namespace dbwrapper_private