leveldb_database.cc revision 1320f92c476a1ad9d19dba2a48c72b75566198e9 
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/files/file_path.h"
11#include "base/files/file_util.h"
12#include "base/memory/scoped_ptr.h"
13#include "base/strings/string_split.h"
14#include "base/threading/thread_checker.h"
15#include "third_party/leveldatabase/src/include/leveldb/db.h"
16#include "third_party/leveldatabase/src/include/leveldb/iterator.h"
17#include "third_party/leveldatabase/src/include/leveldb/options.h"
18#include "third_party/leveldatabase/src/include/leveldb/slice.h"
19#include "third_party/leveldatabase/src/include/leveldb/status.h"
20#include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
21
22namespace leveldb_proto {
23
24LevelDB::LevelDB() {}
25
26LevelDB::~LevelDB() { DFAKE_SCOPED_LOCK(thread_checker_); }
27
28bool LevelDB::Init(const base::FilePath& database_dir) {
29  DFAKE_SCOPED_LOCK(thread_checker_);
30
31  leveldb::Options options;
32  options.create_if_missing = true;
33  options.max_open_files = 0;  // Use minimum.
34
35  std::string path = database_dir.AsUTF8Unsafe();
36
37  leveldb::DB* db = NULL;
38  leveldb::Status status = leveldb::DB::Open(options, path, &db);
39  if (status.IsCorruption()) {
40    base::DeleteFile(database_dir, true);
41    status = leveldb::DB::Open(options, path, &db);
42  }
43
44  if (status.ok()) {
45    CHECK(db);
46    db_.reset(db);
47    return true;
48  }
49
50  LOG(WARNING) << "Unable to open " << database_dir.value() << ": "
51               << status.ToString();
52  return false;
53}
54
55bool LevelDB::Save(const base::StringPairs& 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 (base::StringPairs::const_iterator it = entries_to_save.begin();
61       it != entries_to_save.end();
62       ++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
80bool 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
94