BitCore/src/dbwrapper.cpp at master · LIMXTEC/BitCore · GitHub

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// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <dbwrapper.h>

#include <memory>

#include <random.h>

#include <leveldb/cache.h>

#include <leveldb/env.h>

#include <leveldb/filter_policy.h>

#include <memenv.h>

#include <stdint.h>

#include <algorithm>

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 (!LogAcceptCategory(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';

LogPrintf("leveldb: %s", base); /* Continued */

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 mmaped).

// 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

LogPrint(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;

}

CDBWrapper::CDBWrapper(const fs::path& path, size_t nCacheSize, bool fMemory, bool fWipe, bool obfuscate)

: m_name(fs::basename(path))

{

penv = nullptr;

readoptions.verify_checksums = true;

iteroptions.verify_checksums = true;

iteroptions.fill_cache = false;

syncoptions.sync = true;

options = GetOptions(nCacheSize);

options.create_if_missing = true;

if (fMemory) {

penv = leveldb::NewMemEnv(leveldb::Env::Default());

options.env = penv;

} else {

if (fWipe) {

LogPrintf("Wiping LevelDB in %s\n", path.string());

leveldb::Status result = leveldb::DestroyDB(path.string(), options);

dbwrapper_private::HandleError(result);

}

TryCreateDirectories(path);

LogPrintf("Opening LevelDB in %s\n", path.string());

}

leveldb::Status status = leveldb::DB::Open(options, path.string(), &pdb);

dbwrapper_private::HandleError(status);

LogPrintf("Opened LevelDB successfully\n");

if (gArgs.GetBoolArg("-forcecompactdb", false)) {

LogPrintf("Starting database compaction of %s\n", path.string());

pdb->CompactRange(nullptr, nullptr);

LogPrintf("Finished database compaction of %s\n", path.string());

}

// The base-case obfuscation key, which is a noop.

obfuscate_key = std::vector<unsigned char>(OBFUSCATE_KEY_NUM_BYTES, '\000');

bool key_exists = Read(OBFUSCATE_KEY_KEY, obfuscate_key);

if (!key_exists && obfuscate && IsEmpty()) {

// Initialize non-degenerate obfuscation if it won't upset

// existing, non-obfuscated data.

std::vector<unsigned char> new_key = CreateObfuscateKey();

// Write `new_key` so we don't obfuscate the key with itself

Write(OBFUSCATE_KEY_KEY, new_key);

obfuscate_key = new_key;

LogPrintf("Wrote new obfuscate key for %s: %s\n", path.string(), HexStr(obfuscate_key));

}

LogPrintf("Using obfuscation key for %s: %s\n", path.string(), HexStr(obfuscate_key));

}

CDBWrapper::~CDBWrapper()

{

delete pdb;

pdb = nullptr;

delete options.filter_policy;

options.filter_policy = nullptr;

delete options.info_log;

options.info_log = nullptr;

delete options.block_cache;

options.block_cache = nullptr;

delete penv;

options.env = nullptr;

}

bool CDBWrapper::WriteBatch(CDBBatch& batch, bool fSync)

{

const bool log_memory = LogAcceptCategory(BCLog::LEVELDB);

double mem_before = 0;

if (log_memory) {

mem_before = DynamicMemoryUsage() / 1024.0 / 1024;

}

leveldb::Status status = pdb->Write(fSync ? syncoptions : writeoptions, &batch.batch);

dbwrapper_private::HandleError(status);

if (log_memory) {

double mem_after = DynamicMemoryUsage() / 1024.0 / 1024;

LogPrint(BCLog::LEVELDB, "WriteBatch memory usage: db=%s, before=%.1fMiB, after=%.1fMiB\n",

m_name, mem_before, mem_after);

}

return true;

}

size_t CDBWrapper::DynamicMemoryUsage() const {

std::string memory;

if (!pdb->GetProperty("leveldb.approximate-memory-usage", &memory)) {

LogPrint(BCLog::LEVELDB, "Failed to get approximate-memory-usage property\n");

return 0;

}

return stoul(memory);

}

// Prefixed with null character to avoid collisions with other keys

// We must use a string constructor which specifies length so that we copy

// past the null-terminator.

const std::string CDBWrapper::OBFUSCATE_KEY_KEY("\000obfuscate_key", 14);

const unsigned int CDBWrapper::OBFUSCATE_KEY_NUM_BYTES = 8;

/**

* Returns a string (consisting of 8 random bytes) suitable for use as an

* obfuscating XOR key.

std::vector<unsigned char> CDBWrapper::CreateObfuscateKey() const

{

unsigned char buff[OBFUSCATE_KEY_NUM_BYTES];

GetRandBytes(buff, OBFUSCATE_KEY_NUM_BYTES);

return std::vector<unsigned char>(&buff[0], &buff[OBFUSCATE_KEY_NUM_BYTES]);

}

bool CDBWrapper::IsEmpty()

{

std::unique_ptr<CDBIterator> it(NewIterator());

it->SeekToFirst();

return !(it->Valid());

}

CDBIterator::~CDBIterator() { delete piter; }

bool CDBIterator::Valid() const { return piter->Valid(); }

void CDBIterator::SeekToFirst() { piter->SeekToFirst(); }

void CDBIterator::Next() { piter->Next(); }

namespace dbwrapper_private {

void HandleError(const leveldb::Status& status)

{

if (status.ok())

return;

const std::string errmsg = "Fatal LevelDB error: " + status.ToString();

LogPrintf("%s\n", errmsg);

LogPrintf("You can use -debug=leveldb to get more complete diagnostic messages\n");

throw dbwrapper_error(errmsg);

}

const std::vector<unsigned char>& GetObfuscateKey(const CDBWrapper &w)

{

return w.obfuscate_key;

}

} // namespace dbwrapper_private

BitCore/src/dbwrapper.cpp at master · LIMXTEC/BitCore · GitHub

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