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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/browser/sync_file_system/drive_backend/leveldb_wrapper.h"
#include <stddef.h>
#include <array>
#include <memory>
#include <string>
#include "base/check.h"
#include "base/files/scoped_temp_dir.h"
#include "base/strings/string_number_conversions.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/leveldatabase/env_chromium.h"
#include "third_party/leveldatabase/leveldb_chrome.h"
#include "third_party/leveldatabase/src/include/leveldb/db.h"
namespace sync_file_system {
namespace drive_backend {
struct TestData {
const std::string key;
const std::string value;
};
class LevelDBWrapperTest : public testing::Test {
public:
~LevelDBWrapperTest() override = default;
void SetUp() override {
ASSERT_TRUE(database_dir_.CreateUniqueTempDir());
in_memory_env_ = leveldb_chrome::NewMemEnv("LevelDBWrapperTest");
InitializeLevelDB();
}
void TearDown() override {
db_.reset();
in_memory_env_.reset();
}
void CreateDefaultDatabase() {
leveldb::DB* db = db_->GetLevelDB();
// Expected contents are
// {"a": "1", "ab": "0", "bb": "3", "d": "4"}
auto keys = std::to_array<const char*>({"ab", "a", "d", "bb", "d"});
for (size_t i = 0; i < std::size(keys); ++i) {
leveldb::Status status =
db->Put(leveldb::WriteOptions(), keys[i], base::NumberToString(i));
ASSERT_TRUE(status.ok());
}
}
LevelDBWrapper* GetDB() {
return db_.get();
}
void CheckDBContents(const TestData expects[], size_t size) {
DCHECK(db_);
std::unique_ptr<LevelDBWrapper::Iterator> itr = db_->NewIterator();
itr->SeekToFirst();
for (size_t i = 0; i < size; ++i) {
ASSERT_TRUE(itr->Valid());
EXPECT_EQ(expects[i].key, itr->key().ToString());
EXPECT_EQ(expects[i].value, itr->value().ToString());
itr->Next();
}
EXPECT_FALSE(itr->Valid());
}
private:
void InitializeLevelDB() {
std::unique_ptr<leveldb::DB> db;
leveldb_env::Options options;
options.create_if_missing = true;
options.max_open_files = 0; // Use minimum.
options.env = in_memory_env_.get();
leveldb::Status status = leveldb_env::OpenDB(
options, database_dir_.GetPath().AsUTF8Unsafe(), &db);
ASSERT_TRUE(status.ok());
db_ = std::make_unique<LevelDBWrapper>(std::move(db));
}
base::ScopedTempDir database_dir_;
std::unique_ptr<leveldb::Env> in_memory_env_;
std::unique_ptr<LevelDBWrapper> db_;
};
TEST_F(LevelDBWrapperTest, IteratorTest) {
CreateDefaultDatabase();
std::unique_ptr<LevelDBWrapper::Iterator> itr = GetDB()->NewIterator();
itr->Seek("a");
EXPECT_TRUE(itr->Valid());
EXPECT_EQ("a", itr->key().ToString());
EXPECT_EQ("1", itr->value().ToString());
itr->Next();
EXPECT_TRUE(itr->Valid());
EXPECT_EQ("ab", itr->key().ToString());
EXPECT_EQ("0", itr->value().ToString());
itr->Seek("b");
EXPECT_TRUE(itr->Valid());
EXPECT_EQ("bb", itr->key().ToString());
EXPECT_EQ("3", itr->value().ToString());
itr->Next();
EXPECT_TRUE(itr->Valid());
EXPECT_EQ("d", itr->key().ToString());
EXPECT_EQ("4", itr->value().ToString());
itr->Next();
EXPECT_FALSE(itr->Valid());
itr->SeekToFirst();
EXPECT_TRUE(itr->Valid());
EXPECT_EQ("a", itr->key().ToString());
EXPECT_EQ("1", itr->value().ToString());
itr->Delete();
EXPECT_TRUE(itr->Valid());
EXPECT_EQ("ab", itr->key().ToString());
EXPECT_EQ("0", itr->value().ToString());
itr->SeekToFirst();
EXPECT_TRUE(itr->Valid());
EXPECT_EQ("ab", itr->key().ToString());
EXPECT_EQ("0", itr->value().ToString());
EXPECT_EQ(0, GetDB()->num_puts());
EXPECT_EQ(1, GetDB()->num_deletes());
}
TEST_F(LevelDBWrapperTest, Iterator2Test) {
GetDB()->Put("a", "1");
GetDB()->Put("b", "2");
GetDB()->Put("c", "3");
// Keep pending transanctions on memory.
std::unique_ptr<LevelDBWrapper::Iterator> itr = GetDB()->NewIterator();
std::string prev_key;
std::string prev_value;
int loop_counter = 0;
for (itr->SeekToFirst(); itr->Valid(); itr->Next()) {
ASSERT_NE(prev_key, itr->key().ToString());
ASSERT_NE(prev_value, itr->value().ToString());
prev_key = itr->key().ToString();
prev_value = itr->value().ToString();
++loop_counter;
}
EXPECT_EQ(3, loop_counter);
EXPECT_EQ("c", prev_key);
EXPECT_EQ("3", prev_value);
EXPECT_EQ(3, GetDB()->num_puts());
EXPECT_EQ(0, GetDB()->num_deletes());
}
TEST_F(LevelDBWrapperTest, PutTest) {
TestData merged_data[] = {{"a", "1"}, {"aa", "new0"}, {"ab", "0"},
{"bb", "new2"}, {"c", "new1"}, {"d", "4"}};
TestData orig_data[] = {{"a", "1"}, {"ab", "0"}, {"bb", "3"}, {"d", "4"}};
CreateDefaultDatabase();
// Add pending transactions.
GetDB()->Put("aa", "new0");
GetDB()->Put("c", "new1");
GetDB()->Put("bb", "new2"); // Overwrite an entry.
SCOPED_TRACE("PutTest_Pending");
CheckDBContents(merged_data, std::size(merged_data));
EXPECT_EQ(3, GetDB()->num_puts());
// Remove all pending transactions.
GetDB()->Clear();
EXPECT_EQ(0, GetDB()->num_puts());
SCOPED_TRACE("PutTest_Clear");
CheckDBContents(orig_data, std::size(orig_data));
// Add pending transactions again, with commiting.
GetDB()->Put("aa", "new0");
GetDB()->Put("c", "new1");
GetDB()->Put("bb", "new2");
EXPECT_EQ(3, GetDB()->num_puts());
GetDB()->Commit();
EXPECT_EQ(0, GetDB()->num_puts());
GetDB()->Clear(); // Clear just in case.
SCOPED_TRACE("PutTest_Commit");
CheckDBContents(merged_data, std::size(merged_data));
}
TEST_F(LevelDBWrapperTest, DeleteTest) {
TestData merged_data[] = {{"a", "1"}, {"aa", "new0"}, {"bb", "new2"},
{"d", "4"}};
TestData orig_data[] = {{"a", "1"}, {"ab", "0"}, {"bb", "3"}, {"d", "4"}};
CreateDefaultDatabase();
// Add pending transactions.
GetDB()->Put("aa", "new0");
GetDB()->Put("c", "new1");
GetDB()->Put("bb", "new2"); // Overwrite an entry.
GetDB()->Delete("c"); // Remove a pending entry.
GetDB()->Delete("ab"); // Remove a committed entry.
EXPECT_EQ(3, GetDB()->num_puts());
EXPECT_EQ(2, GetDB()->num_deletes());
SCOPED_TRACE("DeleteTest_Pending");
CheckDBContents(merged_data, std::size(merged_data));
// Remove all pending transactions.
GetDB()->Clear();
SCOPED_TRACE("DeleteTest_Clear");
CheckDBContents(orig_data, std::size(orig_data));
// Add pending transactions again, with commiting.
GetDB()->Put("aa", "new0");
GetDB()->Put("c", "new1");
GetDB()->Put("bb", "new2");
GetDB()->Delete("c");
GetDB()->Delete("ab");
GetDB()->Commit();
GetDB()->Clear();
EXPECT_EQ(0, GetDB()->num_puts());
EXPECT_EQ(0, GetDB()->num_deletes());
SCOPED_TRACE("DeleteTest_Commit");
CheckDBContents(merged_data, std::size(merged_data));
}
} // namespace drive_backend
} // namespace sync_file_system
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