81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
// Copyright (c) 2012 The Bitcoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "leveldb.h"
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#include "util.h"
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#include <leveldb/env.h>
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#include <leveldb/cache.h>
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#include <leveldb/filter_policy.h>
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#include <memenv/memenv.h>
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#include <boost/filesystem.hpp>
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void HandleError(const leveldb::Status &status) throw(leveldb_error) {
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if (status.ok())
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return;
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if (status.IsCorruption())
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throw leveldb_error("Database corrupted");
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if (status.IsIOError())
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throw leveldb_error("Database I/O error");
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if (status.IsNotFound())
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throw leveldb_error("Database entry missing");
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throw leveldb_error("Unknown database error");
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}
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static leveldb::Options GetOptions(size_t nCacheSize) {
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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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return options;
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}
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CLevelDB::CLevelDB(const boost::filesystem::path &path, size_t nCacheSize, bool fMemory, bool fWipe) {
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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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printf("Wiping LevelDB in %s\n", path.string().c_str());
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leveldb::DestroyDB(path.string(), options);
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}
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boost::filesystem::create_directory(path);
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printf("Opening LevelDB in %s\n", path.string().c_str());
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}
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leveldb::Status status = leveldb::DB::Open(options, path.string(), &pdb);
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if (!status.ok())
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throw std::runtime_error(strprintf("CLevelDB(): error opening database environment %s", status.ToString().c_str()));
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printf("Opened LevelDB successfully\n");
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}
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CLevelDB::~CLevelDB() {
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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 CLevelDB::WriteBatch(CLevelDBBatch &batch, bool fSync) throw(leveldb_error) {
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leveldb::Status status = pdb->Write(fSync ? syncoptions : writeoptions, &batch.batch);
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if (!status.ok()) {
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printf("LevelDB write failure: %s\n", status.ToString().c_str());
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HandleError(status);
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return false;
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}
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return true;
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}
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