TomZ
d430a4be8a
The API throws when the directories already exist, which is quite unexpected. This now changes the code to silently ignore these issues in the knowledge that the immediately following opening of files will fail with a nice error message.
118 lines
3.9 KiB
C++
118 lines
3.9 KiB
C++
/*
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* This file is part of the Flowee project
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* Copyright (c) 2012-2015 The Bitcoin Core developers
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "dbwrapper.h"
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#include "util.h"
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#include "random.h"
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#include <boost/filesystem.hpp>
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#include <leveldb/cache.h>
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#include <leveldb/env.h>
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#include <leveldb/filter_policy.h>
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#include <memenv.h>
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void HandleError(const leveldb::Status& status) throw(dbwrapper_error)
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{
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if (status.ok())
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return;
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logCritical(Log::DB) << status.ToString();
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if (status.IsCorruption())
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throw dbwrapper_error("Database corrupted");
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if (status.IsIOError())
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throw dbwrapper_error("Database I/O error");
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if (status.IsNotFound())
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throw dbwrapper_error("Database entry missing");
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throw dbwrapper_error("Unknown database error");
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}
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static leveldb::Options GetOptions(size_t nCacheSize)
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{
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leveldb::Options options;
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options.block_cache = leveldb::NewLRUCache(nCacheSize / 2);
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options.write_buffer_size = nCacheSize / 4; // up to two write buffers may be held in memory simultaneously
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options.filter_policy = leveldb::NewBloomFilterPolicy(10);
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options.compression = leveldb::kNoCompression;
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options.max_open_files = 64;
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if (leveldb::kMajorVersion > 1 || (leveldb::kMajorVersion == 1 && leveldb::kMinorVersion >= 16)) {
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// LevelDB versions before 1.16 consider short writes to be corruption. Only trigger error
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// on corruption in later versions.
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options.paranoid_checks = true;
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}
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return options;
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}
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CDBWrapper::CDBWrapper(const boost::filesystem::path& path, size_t nCacheSize, bool fMemory, bool fWipe)
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{
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penv = NULL;
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readoptions.verify_checksums = true;
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iteroptions.verify_checksums = true;
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iteroptions.fill_cache = false;
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syncoptions.sync = true;
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options = GetOptions(nCacheSize);
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options.create_if_missing = true;
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if (fMemory) {
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penv = leveldb::NewMemEnv(leveldb::Env::Default());
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options.env = penv;
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} else {
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if (fWipe) {
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logCritical(Log::DB) << "Wiping LevelDB in" << path.string();
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leveldb::Status result = leveldb::DestroyDB(path.string(), options);
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HandleError(result);
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}
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boost::system::error_code error;
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boost::filesystem::create_directories(path, error);
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logCritical(Log::DB) << "Opening LevelDB in" << path.string();
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}
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leveldb::Status status = leveldb::DB::Open(options, path.string(), &pdb);
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HandleError(status);
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logInfo(Log::DB) << "Opened LevelDB successfully";
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}
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CDBWrapper::~CDBWrapper()
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{
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delete pdb;
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pdb = NULL;
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delete options.filter_policy;
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options.filter_policy = NULL;
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delete options.block_cache;
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options.block_cache = NULL;
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delete penv;
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options.env = NULL;
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}
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bool CDBWrapper::WriteBatch(CDBBatch& batch, bool fSync) throw(dbwrapper_error)
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{
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leveldb::Status status = pdb->Write(fSync ? syncoptions : writeoptions, &batch.batch);
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HandleError(status);
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return true;
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}
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bool CDBWrapper::IsEmpty()
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{
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boost::scoped_ptr<CDBIterator> it(NewIterator());
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it->SeekToFirst();
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return !(it->Valid());
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}
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CDBIterator::~CDBIterator() { delete piter; }
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bool CDBIterator::Valid() { return piter->Valid(); }
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void CDBIterator::SeekToFirst() { piter->SeekToFirst(); }
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void CDBIterator::Next() { piter->Next(); }
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