chrome/browser/sync_file_system/drive_backend/leveldb_wrapper_unittest.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 "chrome/browser/sync_file_system/drive_backend/leveldb_wrapper.h"
   6
   7 #include <string>
   8
   9 #include "base/files/scoped_temp_dir.h"
  10 #include "base/logging.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13 #include "third_party/leveldatabase/src/helpers/memenv/memenv.h"
  14 #include "third_party/leveldatabase/src/include/leveldb/db.h"
  15 #include "third_party/leveldatabase/src/include/leveldb/env.h"
  16
  17 namespace sync_file_system {
  18 namespace drive_backend {
  19
  20 struct TestData {
  21   const std::string key;
  22   const std::string value;
  23 };
  24
  25 class LevelDBWrapperTest : public testing::Test {
  26  public:
  27   ~LevelDBWrapperTest() override {}
  28
  29   void SetUp() override {
  30     ASSERT_TRUE(database_dir_.CreateUniqueTempDir());
  31     in_memory_env_.reset(leveldb::NewMemEnv(leveldb::Env::Default()));
  32     InitializeLevelDB();
  33   }
  34
  35   void TearDown() override {
  36     db_.reset();
  37     in_memory_env_.reset();
  38   }
  39
  40   void CreateDefaultDatabase() {
  41     leveldb::DB* db = db_->GetLevelDB();
  42
  43     // Expected contents are
  44     // {"a": "1", "ab": "0", "bb": "3", "d": "4"}
  45     const char* keys[] = {"ab", "a", "d", "bb", "d"};
  46     for (size_t i = 0; i < arraysize(keys); ++i) {
  47       leveldb::Status status =
  48           db->Put(leveldb::WriteOptions(), keys[i], base::SizeTToString(i));
  49       ASSERT_TRUE(status.ok());
  50     }
  51   }
  52
  53   LevelDBWrapper* GetDB() {
  54     return db_.get();
  55   }
  56
  57   void CheckDBContents(const TestData expects[], size_t size) {
  58     DCHECK(db_);
  59
  60     scoped_ptr<LevelDBWrapper::Iterator> itr = db_->NewIterator();
  61     itr->SeekToFirst();
  62     for (size_t i = 0; i < size; ++i) {
  63       ASSERT_TRUE(itr->Valid());
  64       EXPECT_EQ(expects[i].key, itr->key().ToString());
  65       EXPECT_EQ(expects[i].value, itr->value().ToString());
  66       itr->Next();
  67     }
  68     EXPECT_FALSE(itr->Valid());
  69   }
  70
  71  private:
  72   void InitializeLevelDB() {
  73     leveldb::DB* db = nullptr;
  74     leveldb::Options options;
  75     options.create_if_missing = true;
  76     options.max_open_files = 0;  // Use minimum.
  77     options.env = in_memory_env_.get();
  78     leveldb::Status status =
  79         leveldb::DB::Open(options, database_dir_.path().AsUTF8Unsafe(), &db);
  80     ASSERT_TRUE(status.ok());
  81
  82     db_.reset(new LevelDBWrapper(make_scoped_ptr(db)));
  83   }
  84
  85   base::ScopedTempDir database_dir_;
  86   scoped_ptr<leveldb::Env> in_memory_env_;
  87   scoped_ptr<LevelDBWrapper> db_;
  88 };
  89
  90 TEST_F(LevelDBWrapperTest, IteratorTest) {
  91   CreateDefaultDatabase();
  92   scoped_ptr<LevelDBWrapper::Iterator> itr = GetDB()->NewIterator();
  93
  94   itr->Seek("a");
  95   EXPECT_TRUE(itr->Valid());
  96   EXPECT_EQ("a", itr->key().ToString());
  97   EXPECT_EQ("1", itr->value().ToString());
  98
  99   itr->Next();
 100   EXPECT_TRUE(itr->Valid());
 101   EXPECT_EQ("ab", itr->key().ToString());
 102   EXPECT_EQ("0", itr->value().ToString());
 103
 104   itr->Seek("b");
 105   EXPECT_TRUE(itr->Valid());
 106   EXPECT_EQ("bb", itr->key().ToString());
 107   EXPECT_EQ("3", itr->value().ToString());
 108
 109   itr->Next();
 110   EXPECT_TRUE(itr->Valid());
 111   EXPECT_EQ("d", itr->key().ToString());
 112   EXPECT_EQ("4", itr->value().ToString());
 113
 114   itr->Next();
 115   EXPECT_FALSE(itr->Valid());
 116
 117   itr->SeekToFirst();
 118   EXPECT_TRUE(itr->Valid());
 119   EXPECT_EQ("a", itr->key().ToString());
 120   EXPECT_EQ("1", itr->value().ToString());
 121
 122   itr->Delete();
 123   EXPECT_TRUE(itr->Valid());
 124   EXPECT_EQ("ab", itr->key().ToString());
 125   EXPECT_EQ("0", itr->value().ToString());
 126
 127   itr->SeekToFirst();
 128   EXPECT_TRUE(itr->Valid());
 129   EXPECT_EQ("ab", itr->key().ToString());
 130   EXPECT_EQ("0", itr->value().ToString());
 131
 132   EXPECT_EQ(0, GetDB()->num_puts());
 133   EXPECT_EQ(1, GetDB()->num_deletes());
 134 }
 135
 136 TEST_F(LevelDBWrapperTest, Iterator2Test) {
 137   GetDB()->Put("a", "1");
 138   GetDB()->Put("b", "2");
 139   GetDB()->Put("c", "3");
 140   // Keep pending transanctions on memory.
 141
 142   scoped_ptr<LevelDBWrapper::Iterator> itr = GetDB()->NewIterator();
 143
 144   std::string prev_key;
 145   std::string prev_value;
 146   int loop_counter = 0;
 147   for (itr->SeekToFirst(); itr->Valid(); itr->Next()) {
 148     ASSERT_NE(prev_key, itr->key().ToString());
 149     ASSERT_NE(prev_value, itr->value().ToString());
 150     prev_key = itr->key().ToString();
 151     prev_value = itr->value().ToString();
 152     ++loop_counter;
 153   }
 154   EXPECT_EQ(3, loop_counter);
 155   EXPECT_EQ("c", prev_key);
 156   EXPECT_EQ("3", prev_value);
 157
 158   EXPECT_EQ(3, GetDB()->num_puts());
 159   EXPECT_EQ(0, GetDB()->num_deletes());
 160 }
 161
 162 TEST_F(LevelDBWrapperTest, PutTest) {
 163   TestData merged_data[] = {{"a", "1"}, {"aa", "new0"}, {"ab", "0"},
 164                             {"bb", "new2"}, {"c", "new1"}, {"d", "4"}};
 165   TestData orig_data[] = {{"a", "1"}, {"ab", "0"}, {"bb", "3"}, {"d", "4"}};
 166
 167   CreateDefaultDatabase();
 168
 169   // Add pending transactions.
 170   GetDB()->Put("aa", "new0");
 171   GetDB()->Put("c", "new1");
 172   GetDB()->Put("bb", "new2");  // Overwrite an entry.
 173
 174   SCOPED_TRACE("PutTest_Pending");
 175   CheckDBContents(merged_data, arraysize(merged_data));
 176
 177   EXPECT_EQ(3, GetDB()->num_puts());
 178   // Remove all pending transactions.
 179   GetDB()->Clear();
 180   EXPECT_EQ(0, GetDB()->num_puts());
 181
 182   SCOPED_TRACE("PutTest_Clear");
 183   CheckDBContents(orig_data, arraysize(orig_data));
 184
 185   // Add pending transactions again, with commiting.
 186   GetDB()->Put("aa", "new0");
 187   GetDB()->Put("c", "new1");
 188   GetDB()->Put("bb", "new2");
 189   EXPECT_EQ(3, GetDB()->num_puts());
 190   GetDB()->Commit();
 191   EXPECT_EQ(0, GetDB()->num_puts());
 192   GetDB()->Clear();  // Clear just in case.
 193
 194   SCOPED_TRACE("PutTest_Commit");
 195   CheckDBContents(merged_data, arraysize(merged_data));
 196 }
 197
 198 TEST_F(LevelDBWrapperTest, DeleteTest) {
 199   TestData merged_data[] = {{"a", "1"}, {"aa", "new0"}, {"bb", "new2"},
 200                             {"d", "4"}};
 201   TestData orig_data[] = {{"a", "1"}, {"ab", "0"}, {"bb", "3"}, {"d", "4"}};
 202
 203   CreateDefaultDatabase();
 204
 205   // Add pending transactions.
 206   GetDB()->Put("aa", "new0");
 207   GetDB()->Put("c", "new1");
 208   GetDB()->Put("bb", "new2");  // Overwrite an entry.
 209   GetDB()->Delete("c");        // Remove a pending entry.
 210   GetDB()->Delete("ab");       // Remove a committed entry.
 211
 212   EXPECT_EQ(3, GetDB()->num_puts());
 213   EXPECT_EQ(2, GetDB()->num_deletes());
 214
 215   SCOPED_TRACE("DeleteTest_Pending");
 216   CheckDBContents(merged_data, arraysize(merged_data));
 217
 218   // Remove all pending transactions.
 219   GetDB()->Clear();
 220
 221   SCOPED_TRACE("DeleteTest_Clear");
 222   CheckDBContents(orig_data, arraysize(orig_data));
 223
 224   // Add pending transactions again, with commiting.
 225   GetDB()->Put("aa", "new0");
 226   GetDB()->Put("c", "new1");
 227   GetDB()->Put("bb", "new2");
 228   GetDB()->Delete("c");
 229   GetDB()->Delete("ab");
 230   GetDB()->Commit();
 231   GetDB()->Clear();
 232
 233   EXPECT_EQ(0, GetDB()->num_puts());
 234   EXPECT_EQ(0, GetDB()->num_deletes());
 235
 236   SCOPED_TRACE("DeleteTest_Commit");
 237   CheckDBContents(merged_data, arraysize(merged_data));
 238 }
 239
 240 }  // namespace drive_backend
 241 }  // namespace sync_file_system