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));
}
bool BerkeleyEnvironment::Open(bool retry)
{
if (fDbEnvInit)
return true;
boost::this_thread::interruption_point();
fs::path pathIn = strPath;
TryCreateDirectories(pathIn);
if (!LockDirectory(pathIn, ".walletlock")) {
LogPrintf("Cannot obtain a lock on wallet directory %s. Another instance of bitcoin may be using it.\n", strPath);
return false;
}
fs::path pathLogDir = pathIn / "database";
TryCreateDirectories(pathLogDir);
fs::path pathErrorFile = pathIn / "db.log";
LogPrintf("BerkeleyEnvironment::Open: LogDir=%s ErrorFile=%s\n", pathLogDir.string(), pathErrorFile.string());
unsigned int nEnvFlags = 0;
if (gArgs.GetBoolArg("-privdb", DEFAULT_WALLET_PRIVDB))
nEnvFlags |= DB_PRIVATE;
dbenv->set_lg_dir(pathLogDir.string().c_str());
dbenv->set_cachesize(0, 0x100000, 1); // 1 MiB should be enough for just the wallet
dbenv->set_lg_bsize(0x10000);
dbenv->set_lg_max(1048576);
dbenv->set_lk_max_locks(40000);
dbenv->set_lk_max_objects(40000);
dbenv->set_errfile(fsbridge::fopen(pathErrorFile, "a")); /// debug
dbenv->set_flags(DB_AUTO_COMMIT, 1);
dbenv->set_flags(DB_TXN_WRITE_NOSYNC, 1);
dbenv->log_set_config(DB_LOG_AUTO_REMOVE, 1);
int ret = dbenv->open(strPath.c_str(),
DB_CREATE |
DB_INIT_LOCK |
DB_INIT_LOG |
DB_INIT_MPOOL |
DB_INIT_TXN |
DB_THREAD |
DB_RECOVER |
nEnvFlags,
S_IRUSR | S_IWUSR);
if (ret != 0) {
LogPrintf("BerkeleyEnvironment::Open: Error %d opening database environment: %s\n", ret, DbEnv::strerror(ret));
int ret2 = dbenv->close(0);
if (ret2 != 0) {
LogPrintf("BerkeleyEnvironment::Open: Error %d closing failed database environment: %s\n", ret2, DbEnv::strerror(ret2));
}
Reset();
if (retry) {
// try moving the database env out of the way
fs::path pathDatabaseBak = pathIn / strprintf("database.%d.bak", GetTime());
try {
fs::rename(pathLogDir, pathDatabaseBak);
LogPrintf("Moved old %s to %s. Retrying.\n", pathLogDir.string(), pathDatabaseBak.string());
} catch (const fs::filesystem_error&) {
// failure is ok (well, not really, but it's not worse than what we started with)
}
// try opening it again one more time
if (!Open(false /* retry */)) {
// if it still fails, it probably means we can't even create the database env
return false;
}
} else {
return false;
}
}
fDbEnvInit = true;
fMockDb = false;
return true;
}
