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/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
  22 namespace leveldb_proto {
  23
  24 LevelDB::LevelDB() {}
  25
  26 LevelDB::~LevelDB() { DFAKE_SCOPED_LOCK(thread_checker_); }
  27
  28 bool 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
  55 bool 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
  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