src/leveldbwrapper.cpp

   1 // Copyright (c) 2012-2014 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "leveldbwrapper.h"
   6
   7 #include "util.h"
   8
   9 #include <boost/filesystem.hpp>
  10
  11 #include <leveldb/cache.h>
  12 #include <leveldb/env.h>
  13 #include <leveldb/filter_policy.h>
  14 #include <memenv.h>
  15
  16 void HandleError(const leveldb::Status& status) throw(leveldb_error)
  17 {
  18     if (status.ok())
  19         return;
  20     LogPrintf("%s\n", status.ToString());
  21     if (status.IsCorruption())
  22         throw leveldb_error("Database corrupted");
  23     if (status.IsIOError())
  24         throw leveldb_error("Database I/O error");
  25     if (status.IsNotFound())
  26         throw leveldb_error("Database entry missing");
  27     throw leveldb_error("Unknown database error");
  28 }
  29
  30 static leveldb::Options GetOptions(size_t nCacheSize)
  31 {
  32     leveldb::Options options;
  33     options.block_cache = leveldb::NewLRUCache(nCacheSize / 2);
  34     options.write_buffer_size = nCacheSize / 4; // up to two write buffers may be held in memory simultaneously
  35     options.filter_policy = leveldb::NewBloomFilterPolicy(10);
  36     options.compression = leveldb::kNoCompression;
  37     options.max_open_files = 64;
  38     if (leveldb::kMajorVersion > 1 || (leveldb::kMajorVersion == 1 && leveldb::kMinorVersion >= 16)) {
  39         // LevelDB versions before 1.16 consider short writes to be corruption. Only trigger error
  40         // on corruption in later versions.
  41         options.paranoid_checks = true;
  42     }
  43     return options;
  44 }
  45
  46 CLevelDBWrapper::CLevelDBWrapper(const boost::filesystem::path& path, size_t nCacheSize, bool fMemory, bool fWipe)
  47 {
  48     penv = NULL;
  49     readoptions.verify_checksums = true;
  50     iteroptions.verify_checksums = true;
  51     iteroptions.fill_cache = false;
  52     syncoptions.sync = true;
  53     options = GetOptions(nCacheSize);
  54     options.create_if_missing = true;
  55     if (fMemory) {
  56         penv = leveldb::NewMemEnv(leveldb::Env::Default());
  57         options.env = penv;
  58     } else {
  59         if (fWipe) {
  60             LogPrintf("Wiping LevelDB in %s\n", path.string());
  61             leveldb::Status result = leveldb::DestroyDB(path.string(), options);
  62             HandleError(result);
  63         }
  64         TryCreateDirectory(path);
  65         LogPrintf("Opening LevelDB in %s\n", path.string());
  66     }
  67     leveldb::Status status = leveldb::DB::Open(options, path.string(), &pdb);
  68     HandleError(status);
  69     LogPrintf("Opened LevelDB successfully\n");
  70 }
  71
  72 CLevelDBWrapper::~CLevelDBWrapper()
  73 {
  74     delete pdb;
  75     pdb = NULL;
  76     delete options.filter_policy;
  77     options.filter_policy = NULL;
  78     delete options.block_cache;
  79     options.block_cache = NULL;
  80     delete penv;
  81     options.env = NULL;
  82 }
  83
  84 bool CLevelDBWrapper::WriteBatch(CLevelDBBatch& batch, bool fSync) throw(leveldb_error)
  85 {
  86     leveldb::Status status = pdb->Write(fSync ? syncoptions : writeoptions, &batch.batch);
  87     HandleError(status);
  88     return true;
  89 }