Implementation of leveldb-backed PrefStore

chrome/browser/prefs/leveldb_pref_store_unittest.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/prefs/leveldb_pref_store.h"
+
+#include "base/file_util.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/path_service.h"
+#include "base/run_loop.h"
+#include "base/values.h"
+#include "chrome/common/chrome_paths.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class MockPrefStoreObserver : public PrefStore::Observer {
+ public:
+  MOCK_METHOD1(OnPrefValueChanged, void(const std::string&));
+  MOCK_METHOD1(OnInitializationCompleted, void(bool));
+};
+
+class MockReadErrorDelegate : public PersistentPrefStore::ReadErrorDelegate {
+ public:
+  MOCK_METHOD1(OnError, void(PersistentPrefStore::PrefReadError));
+};
+
+}  // namespace
+
+class LevelDBPrefStoreTest : public testing::Test {
+ protected:
+  virtual void SetUp() OVERRIDE {
+    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+
+    ASSERT_TRUE(PathService::Get(chrome::DIR_TEST_DATA, &data_dir_));
+    data_dir_ = data_dir_.AppendASCII("prefs");
+    ASSERT_TRUE(PathExists(data_dir_));
+  }
+
+  virtual void TearDown() OVERRIDE {
+    Close();
+  }
+
+  void Open() {
+    pref_store_ = new LevelDBPrefStore(
+        temp_dir_.path(), message_loop_.message_loop_proxy().get());
+    EXPECT_EQ(LevelDBPrefStore::PREF_READ_ERROR_NONE, pref_store_->ReadPrefs());
+  }
+
+  void Close() {
+    pref_store_ = NULL;
+    base::RunLoop().RunUntilIdle();
+  }
+
+  void CloseAndReopen() {
+    Close();
+    Open();
+  }
+
+  // The path to temporary directory used to contain the test operations.
+  base::ScopedTempDir temp_dir_;
+  // The path to the directory where the test data is stored in the source tree.
+  base::FilePath data_dir_;
+  // A message loop that we can use as the file thread message loop.
+  base::MessageLoop message_loop_;
+
+  scoped_refptr<LevelDBPrefStore> pref_store_;
+};
+
+TEST_F(LevelDBPrefStoreTest, PutAndGet) {
+  Open();
+  const std::string key = "some.key";
+  pref_store_->SetValue(key, new base::FundamentalValue(5));
+  base::FundamentalValue orig_value(5);
+  const base::Value* actual_value;
+  EXPECT_TRUE(pref_store_->GetValue(key, &actual_value));
+  EXPECT_TRUE(orig_value.Equals(actual_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, PutAndGetPersistent) {
+  Open();
+  const std::string key = "some.key";
+  pref_store_->SetValue(key, new base::FundamentalValue(5));
+
+  CloseAndReopen();
+  const base::Value* actual_value = NULL;
+  base::FundamentalValue orig_value(5);
+  EXPECT_TRUE(pref_store_->GetValue(key, &actual_value));
+  EXPECT_TRUE(orig_value.Equals(actual_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, BasicObserver) {
+  scoped_refptr<LevelDBPrefStore> pref_store = new LevelDBPrefStore(
+      temp_dir_.path(), message_loop_.message_loop_proxy().get());
+  MockPrefStoreObserver mock_observer;
+  pref_store->AddObserver(&mock_observer);
+  EXPECT_CALL(mock_observer, OnInitializationCompleted(true)).Times(1);
+  EXPECT_EQ(PersistentPrefStore::PREF_READ_ERROR_NONE, pref_store->ReadPrefs());
+  testing::Mock::VerifyAndClearExpectations(&mock_observer);
+
+  const std::string key = "some.key";
+  EXPECT_CALL(mock_observer, OnPrefValueChanged(key)).Times(1);
+  pref_store->SetValue(key, new base::FundamentalValue(5));
+
+  pref_store->RemoveObserver(&mock_observer);
+}
+
+TEST_F(LevelDBPrefStoreTest, SetValueSilently) {
+  Open();
+
+  MockPrefStoreObserver mock_observer;
+  pref_store_->AddObserver(&mock_observer);
+  const std::string key = "some.key";
+  EXPECT_CALL(mock_observer, OnPrefValueChanged(key)).Times(0);
+  pref_store_->SetValueSilently(key, new base::FundamentalValue(30));
+  pref_store_->RemoveObserver(&mock_observer);
+
+  CloseAndReopen();
+  base::FundamentalValue value(30);
+  const base::Value* actual_value = NULL;
+  EXPECT_TRUE(pref_store_->GetValue(key, &actual_value));
+  EXPECT_TRUE(base::Value::Equals(&value, actual_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, GetMutableValue) {
+  Open();
+
+  const std::string key = "some.key";
+  base::DictionaryValue* orig_value = new base::DictionaryValue;
+  orig_value->SetInteger("key2", 25);
+  pref_store_->SetValue(key, orig_value);
+
+  base::Value* actual_value;
+  EXPECT_TRUE(pref_store_->GetMutableValue(key, &actual_value));
+  EXPECT_TRUE(orig_value->Equals(actual_value));
+  base::DictionaryValue* dict_value;
+  ASSERT_TRUE(actual_value->GetAsDictionary(&dict_value));
+  dict_value->SetInteger("key2", 30);
+  pref_store_->ReportValueChanged(key);
+
+  // Ensure the new value is stored in memory.
+  const base::Value* retrieved_value;
+  EXPECT_TRUE(pref_store_->GetValue(key, &retrieved_value));
+  scoped_ptr<base::DictionaryValue> golden_value(new base::DictionaryValue);
+  golden_value->SetInteger("key2", 30);
+  EXPECT_TRUE(base::Value::Equals(golden_value.get(), retrieved_value));
+
+  // Ensure the new value is persisted to disk.
+  CloseAndReopen();
+  EXPECT_TRUE(pref_store_->GetValue(key, &retrieved_value));
+  EXPECT_TRUE(base::Value::Equals(golden_value.get(), retrieved_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, RemoveFromMemory) {
+  Open();
+  const std::string key = "some.key";
+  pref_store_->SetValue(key, new base::FundamentalValue(5));
+
+  MockPrefStoreObserver mock_observer;
+  pref_store_->AddObserver(&mock_observer);
+  EXPECT_CALL(mock_observer, OnPrefValueChanged(key)).Times(1);
+  pref_store_->RemoveValue(key);
+  pref_store_->RemoveObserver(&mock_observer);
+
+  const base::Value* retrieved_value;
+  EXPECT_FALSE(pref_store_->GetValue(key, &retrieved_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, RemoveFromDisk) {
+  Open();
+  const std::string key = "some.key";
+  pref_store_->SetValue(key, new base::FundamentalValue(5));
+
+  CloseAndReopen();
+
+  pref_store_->RemoveValue(key);
+
+  CloseAndReopen();
+
+  const base::Value* retrieved_value;
+  EXPECT_FALSE(pref_store_->GetValue(key, &retrieved_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, OpenAsync) {
+  // First set a key/value with a synchronous connection.
+  Open();
+  const std::string key = "some.key";
+  pref_store_->SetValue(key, new base::FundamentalValue(5));
+  Close();
+
+  scoped_refptr<LevelDBPrefStore> pref_store(new LevelDBPrefStore(
+      temp_dir_.path(), message_loop_.message_loop_proxy().get()));
+  MockReadErrorDelegate* delegate = new MockReadErrorDelegate;
+  pref_store->ReadPrefsAsync(delegate);
+
+  MockPrefStoreObserver mock_observer;
+  pref_store->AddObserver(&mock_observer);
+  EXPECT_CALL(mock_observer, OnInitializationCompleted(true)).Times(1);
+  base::RunLoop().RunUntilIdle();
+  pref_store->RemoveObserver(&mock_observer);
+
+  const base::Value* result;
+  EXPECT_TRUE(pref_store->GetValue("some.key", &result));
+  int int_value;
+  EXPECT_TRUE(result->GetAsInteger(&int_value));
+  EXPECT_EQ(5, int_value);
+
+  pref_store = NULL;
+}
+
+TEST_F(LevelDBPrefStoreTest, OpenAsyncError) {
+  // Open a connection that will lock the database.
+  Open();
+
+  // Try to open an async connection to the same database.
+  scoped_refptr<LevelDBPrefStore> pref_store(new LevelDBPrefStore(
+      temp_dir_.path(), message_loop_.message_loop_proxy().get()));
+  MockReadErrorDelegate* delegate = new MockReadErrorDelegate;
+  pref_store->ReadPrefsAsync(delegate);
+
+  MockPrefStoreObserver mock_observer;
+  pref_store->AddObserver(&mock_observer);
+  EXPECT_CALL(*delegate,
+              OnError(PersistentPrefStore::PREF_READ_ERROR_LEVELDB_IO))
+      .Times(1);
+  EXPECT_CALL(mock_observer, OnInitializationCompleted(true)).Times(1);
+  base::RunLoop().RunUntilIdle();
+  pref_store->RemoveObserver(&mock_observer);
+
+  EXPECT_TRUE(pref_store->ReadOnly());
+  EXPECT_EQ(PersistentPrefStore::PREF_READ_ERROR_LEVELDB_IO,
+            pref_store->GetReadError());
+
+  // Sync connection to the database will be closed by the destructor.
+}
+
+TEST_F(LevelDBPrefStoreTest, RepairCorrupt) {
+  // Open a database where CURRENT has no newline. Ensure that repair is called
+  // and there is no error reading the database.
+  base::FilePath corrupted_dir = data_dir_.AppendASCII("corrupted_leveldb");
+  base::FilePath dest = temp_dir_.path().AppendASCII("corrupted_leveldb");
+  const bool kRecursive = true;
+  ASSERT_TRUE(CopyDirectory(corrupted_dir, dest, kRecursive));
+  pref_store_ =
+      new LevelDBPrefStore(dest, message_loop_.message_loop_proxy().get());
+  EXPECT_EQ(LevelDBPrefStore::PREF_READ_ERROR_LEVELDB_CORRUPTION,
+            pref_store_->ReadPrefs());
+}
+
+TEST_F(LevelDBPrefStoreTest, Values) {
+  Open();
+  pref_store_->SetValue("boolean", new base::FundamentalValue(false));
+  pref_store_->SetValue("integer", new base::FundamentalValue(10));
+  pref_store_->SetValue("double", new base::FundamentalValue(10.3));
+  pref_store_->SetValue("string", new base::StringValue("some string"));
+
+  base::DictionaryValue* dict_value = new base::DictionaryValue;
+  dict_value->Set("boolean", new base::FundamentalValue(true));
+  scoped_ptr<base::DictionaryValue> golden_dict_value(dict_value->DeepCopy());
+  pref_store_->SetValue("dictionary", dict_value);
+
+  base::ListValue* list_value = new base::ListValue;
+  list_value->Set(2, new base::StringValue("string in list"));
+  scoped_ptr<base::ListValue> golden_list_value(list_value->DeepCopy());
+  pref_store_->SetValue("list", list_value);
+
+  // Do something nontrivial as well.
+  base::DictionaryValue* compound_value = new base::DictionaryValue;
+  base::ListValue* outer_list = new base::ListValue;
+  base::ListValue* inner_list = new base::ListValue;
+  inner_list->Set(0, new base::FundamentalValue(5));
+  outer_list->Set(1, inner_list);
+  compound_value->Set("compound_lists", outer_list);
+  scoped_ptr<base::DictionaryValue> golden_compound_value(
+      compound_value->DeepCopy());
+  pref_store_->SetValue("compound_value", compound_value);
+
+  CloseAndReopen();
+
+  const base::Value* value;
+  EXPECT_TRUE(pref_store_->GetValue("boolean", &value));
+  EXPECT_TRUE(base::FundamentalValue(false).Equals(value));
+
+  EXPECT_TRUE(pref_store_->GetValue("integer", &value));
+  EXPECT_TRUE(base::FundamentalValue(10).Equals(value));
+
+  EXPECT_TRUE(pref_store_->GetValue("double", &value));
+  EXPECT_TRUE(base::FundamentalValue(10.3).Equals(value));
+
+  EXPECT_TRUE(pref_store_->GetValue("string", &value));
+  EXPECT_TRUE(base::StringValue("some string").Equals(value));
+
+  EXPECT_TRUE(pref_store_->GetValue("dictionary", &value));
+  EXPECT_TRUE(base::Value::Equals(golden_dict_value.get(), value));
+
+  EXPECT_TRUE(pref_store_->GetValue("list", &value));
+  EXPECT_TRUE(base::Value::Equals(golden_list_value.get(), value));
+
+  EXPECT_TRUE(pref_store_->GetValue("compound_value", &value));
+  EXPECT_TRUE(base::Value::Equals(golden_compound_value.get(), value));
+}