Method CDBWrapper

src/dbwrapper.cpp:117–171

}

CDBWrapper::CDBWrapper(const fs::path& path, size_t nCacheSize, bool fMemory, bool fWipe, bool obfuscate)
    : m_name{fs::PathToString(path.stem())}
{
    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", fs::PathToString(path));
            leveldb::Status result = leveldb::DestroyDB(fs::PathToString(path), options);
            dbwrapper_private::HandleError(result);
        }
        TryCreateDirectories(path);
        LogPrintf("Opening LevelDB in %s\n", fs::PathToString(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(options, fs::PathToString(path), &pdb);
    dbwrapper_private::HandleError(status);
    LogPrintf("Opened LevelDB successfully\n");

    if (gArgs.GetBoolArg("-forcecompactdb", false)) {
        LogPrintf("Starting database compaction of %s\n", fs::PathToString(path));
        pdb->CompactRange(nullptr, nullptr);
        LogPrintf("Finished database compaction of %s\n", fs::PathToString(path));
    }

    // 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", fs::PathToString(path), HexStr(obfuscate_key));
    }

    LogPrintf("Using obfuscation key for %s: %s\n", fs::PathToString(path), HexStr(obfuscate_key));
}

CDBWrapper::~CDBWrapper()
{