components/leveldb_proto/leveldb_database.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/leveldb_proto/leveldb_database.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/file_util.h"
  11 #include "base/files/file_path.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/threading/thread_checker.h"
  14 #include "third_party/leveldatabase/src/include/leveldb/db.h"
  15 #include "third_party/leveldatabase/src/include/leveldb/iterator.h"
  16 #include "third_party/leveldatabase/src/include/leveldb/options.h"
  17 #include "third_party/leveldatabase/src/include/leveldb/slice.h"
  18 #include "third_party/leveldatabase/src/include/leveldb/status.h"
  19 #include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
  20
  21 namespace leveldb_proto {
  22
  23 LevelDB::LevelDB() {}
  24
  25 LevelDB::~LevelDB() { DFAKE_SCOPED_LOCK(thread_checker_); }
  26
  27 bool LevelDB::Init(const base::FilePath& database_dir) {
  28   DFAKE_SCOPED_LOCK(thread_checker_);
  29
  30   leveldb::Options options;
  31   options.create_if_missing = true;
  32   options.max_open_files = 0;  // Use minimum.
  33
  34   std::string path = database_dir.AsUTF8Unsafe();
  35
  36   leveldb::DB* db = NULL;
  37   leveldb::Status status = leveldb::DB::Open(options, path, &db);
  38   if (status.IsCorruption()) {
  39     base::DeleteFile(database_dir, true);
  40     status = leveldb::DB::Open(options, path, &db);
  41   }
  42
  43   if (status.ok()) {
  44     CHECK(db);
  45     db_.reset(db);
  46     return true;
  47   }
  48
  49   LOG(WARNING) << "Unable to open " << database_dir.value() << ": "
  50                << status.ToString();
  51   return false;
  52 }
  53
  54 bool LevelDB::Save(
  55     const std::vector<std::pair<std::string, std::string> >& entries_to_save,
  56     const std::vector<std::string>& keys_to_remove) {
  57   DFAKE_SCOPED_LOCK(thread_checker_);
  58
  59   leveldb::WriteBatch updates;
  60   for (std::vector<std::pair<std::string, std::string> >::const_iterator it =
  61            entries_to_save.begin();
  62        it != entries_to_save.end(); ++it) {
  63     updates.Put(leveldb::Slice(it->first), leveldb::Slice(it->second));
  64   }
  65   for (std::vector<std::string>::const_iterator it = keys_to_remove.begin();
  66        it != keys_to_remove.end(); ++it) {
  67     updates.Delete(leveldb::Slice(*it));
  68   }
  69
  70   leveldb::WriteOptions options;
  71   options.sync = true;
  72   leveldb::Status status = db_->Write(options, &updates);
  73   if (status.ok()) return true;
  74
  75   DLOG(WARNING) << "Failed writing leveldb_proto entries: "
  76                 << status.ToString();
  77   return false;
  78 }
  79
  80 bool LevelDB::Load(std::vector<std::string>* entries) {
  81   DFAKE_SCOPED_LOCK(thread_checker_);
  82
  83   leveldb::ReadOptions options;
  84   scoped_ptr<leveldb::Iterator> db_iterator(db_->NewIterator(options));
  85   for (db_iterator->SeekToFirst(); db_iterator->Valid(); db_iterator->Next()) {
  86     leveldb::Slice value_slice = db_iterator->value();
  87     std::string entry(value_slice.data(), value_slice.size());
  88     entries->push_back(entry);
  89   }
  90   return true;
  91 }
  92
  93 }  // namespace leveldb_proto