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// Copyright (c) 2012-2014 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "leveldbwrapper.h"
#include "util.h"
#include <boost/filesystem.hpp>
#include <leveldb/cache.h>
#include <leveldb/env.h>
#include <leveldb/filter_policy.h>
#include <memenv.h>
void HandleError(const leveldb::Status& status) throw(leveldb_error)
{
if (status.ok())
return;
LogPrintf("%s\n", status.ToString());
if (status.IsCorruption())
throw leveldb_error("Database corrupted");
if (status.IsIOError())
throw leveldb_error("Database I/O error");
if (status.IsNotFound())
throw leveldb_error("Database entry missing");
throw leveldb_error("Unknown database error");
}
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.max_open_files = 64;
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;
}
return options;
}
CLevelDBWrapper::CLevelDBWrapper(const boost::filesystem::path& path, size_t nCacheSize, bool fMemory, bool fWipe)
{
penv = NULL;
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);
HandleError(result);
}
TryCreateDirectory(path);
LogPrintf("Opening LevelDB in %s\n", path.string());
}
leveldb::Status status = leveldb::DB::Open(options, path.string(), &pdb);
HandleError(status);
LogPrintf("Opened LevelDB successfully\n");
}
CLevelDBWrapper::~CLevelDBWrapper()
{
delete pdb;
pdb = NULL;
delete options.filter_policy;
options.filter_policy = NULL;
delete options.block_cache;
options.block_cache = NULL;
delete penv;
options.env = NULL;
}
bool CLevelDBWrapper::WriteBatch(CLevelDBBatch& batch, bool fSync) throw(leveldb_error)
{
leveldb::Status status = pdb->Write(fSync ? syncoptions : writeoptions, &batch.batch);
HandleError(status);
return true;
}