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/*
Copyright (C) 2019-Present SKALE Labs
This file is part of sgxwallet.
sgxwallet is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
sgxwallet is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with sgxwallet. If not, see <https://www.gnu.org/licenses/>.
@file LevelDB.cpp
@author Stan Kladko
@date 2019
*/
#include <stdexcept>
#include <memory>
#include <string>
#include <iostream>
#include "leveldb/db.h"
#include "sgxwallet_common.h"
#include "RPCException.h"
#include "LevelDB.h"
using namespace leveldb;
static WriteOptions writeOptions;
static ReadOptions readOptions;
LevelDB* levelDb = nullptr;
std::shared_ptr<std::string> LevelDB::readString(const std::string &_key) {
std::lock_guard<std::recursive_mutex> lock(mutex);
auto result = std::make_shared<std::string>();
if (db == nullptr) {
throw RPCException(NULL_DATABASE, "Null db");
}
auto status = db->Get(readOptions, _key, &*result);
std::cerr << "key to read from db: " << _key <<std::endl;
throwExceptionOnError(status);
if (status.IsNotFound())
return nullptr;
return result;
}
void LevelDB::writeString(const std::string &_key, const std::string &_value) {
std::lock_guard<std::recursive_mutex> lock(mutex);
auto status = db->Put(writeOptions, Slice(_key), Slice(_value));
throwExceptionOnError(status);
std::cerr << "written key " << _key << std::endl;//<< " value " << _value << std::endl;
}
void LevelDB::deleteDHDKGKey (const std::string &_key) {
std::lock_guard<std::recursive_mutex> lock(mutex);
std::string full_key = "DKG_DH_KEY_" + _key;
auto status = db->Delete(writeOptions, Slice(_key));
throwExceptionOnError(status);
std::cerr << "key deleted " << full_key << std::endl;
}
void LevelDB::deleteOlegKey (const std::string &_key) {
std::lock_guard<std::recursive_mutex> lock(mutex);
std::string full_key = "key" + _key;
auto status = db->Delete(writeOptions, Slice(_key));
throwExceptionOnError(status);
std::cerr << "key deleted " << full_key << std::endl;
}
void LevelDB::deleteTempNEK(const std::string &_key){
std::lock_guard<std::recursive_mutex> lock(mutex);
std::string prefix = _key.substr(0,8);
if (prefix != "tmp_NEK:") {
return;
}
auto status = db->Delete(writeOptions, Slice(_key));
throwExceptionOnError(status);
std::cerr << "key deleted " << _key << std::endl;
}
void LevelDB::deleteKey(const std::string &_key){
std::lock_guard<std::recursive_mutex> lock(mutex);
auto status = db->Delete(writeOptions, Slice(_key));
throwExceptionOnError(status);
std::cerr << "key deleted " << _key << std::endl;
}
void LevelDB::writeByteArray(const char *_key, size_t _keyLen, const char *value,
size_t _valueLen) {
std::lock_guard<std::recursive_mutex> lock(mutex);
auto status = db->Put(writeOptions, Slice(_key, _keyLen), Slice(value, _valueLen));
throwExceptionOnError(status);
}
void LevelDB::writeByteArray(std::string &_key, const char *value,
size_t _valueLen) {
std::lock_guard<std::recursive_mutex> lock(mutex);
auto status = db->Put(writeOptions, Slice(_key), Slice(value, _valueLen));
throwExceptionOnError(status);
}
void LevelDB::throwExceptionOnError(Status _status) {
if (_status.IsNotFound())
return;
if (!_status.ok()) {
throw RPCException(COULD_NOT_ACCESS_DATABASE, ("Could not access database database:" + _status.ToString()).c_str());
}
}
uint64_t LevelDB::visitKeys(LevelDB::KeyVisitor *_visitor, uint64_t _maxKeysToVisit) {
std::lock_guard<std::recursive_mutex> lock(mutex);
uint64_t readCounter = 0;
leveldb::Iterator *it = db->NewIterator(readOptions);
for (it->SeekToFirst(); it->Valid(); it->Next()) {
_visitor->visitDBKey(it->key().data());
readCounter++;
if (readCounter >= _maxKeysToVisit) {
break;
}
}
delete it;
return readCounter;
}
LevelDB::LevelDB(std::string &filename) {
leveldb::Options options;
options.create_if_missing = true;
if (!leveldb::DB::Open(options, filename, (leveldb::DB **) &db).ok()) {
throw std::runtime_error("Unable to open levelDB database");
}
if (db == nullptr) {
throw std::runtime_error("Null levelDB object");
}
}
LevelDB::~LevelDB() {
if (db != nullptr)
delete db;
}