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// Copyright 2013 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 "net/disk_cache/simple/simple_version_upgrade.h"
#include "base/basictypes.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/format_macros.h"
#include "base/strings/stringprintf.h"
#include "net/base/net_errors.h"
#include "net/disk_cache/simple/simple_backend_version.h"
#include "net/disk_cache/simple/simple_entry_format_history.h"
#include "testing/gtest/include/gtest/gtest.h"
// The migration process relies on ability to rename newly created files, which
// could be problematic on Windows XP.
#if defined(OS_POSIX)
namespace {
// Same as |disk_cache::kSimpleInitialMagicNumber|.
const uint64 kSimpleInitialMagicNumber = GG_UINT64_C(0xfcfb6d1ba7725c30);
// The "fake index" file that cache backends use to distinguish whether the
// cache belongs to one backend or another.
const char kFakeIndexFileName[] = "index";
// Same as |SimpleIndexFile::kIndexFileName|.
const char kIndexFileName[] = "the-real-index";
bool WriteFakeIndexFileV5(const base::FilePath& cache_path) {
disk_cache::FakeIndexData data;
data.version = 5;
data.initial_magic_number = kSimpleInitialMagicNumber;
data.unused_must_be_zero1 = 0;
data.unused_must_be_zero2 = 0;
const base::FilePath file_name = cache_path.AppendASCII("index");
return sizeof(data) ==
base::WriteFile(
file_name, reinterpret_cast<const char*>(&data), sizeof(data));
}
TEST(SimpleVersionUpgradeTest, FailsToMigrateBackwards) {
base::ScopedTempDir cache_dir;
ASSERT_TRUE(cache_dir.CreateUniqueTempDir());
const base::FilePath cache_path = cache_dir.path();
disk_cache::FakeIndexData data;
data.version = 100500;
data.initial_magic_number = kSimpleInitialMagicNumber;
data.unused_must_be_zero1 = 0;
data.unused_must_be_zero2 = 0;
const base::FilePath file_name = cache_path.AppendASCII(kFakeIndexFileName);
ASSERT_EQ(implicit_cast<int>(sizeof(data)),
base::WriteFile(
file_name, reinterpret_cast<const char*>(&data), sizeof(data)));
EXPECT_FALSE(disk_cache::UpgradeSimpleCacheOnDisk(cache_dir.path()));
}
TEST(SimpleVersionUpgradeTest, FakeIndexVersionGetsUpdated) {
base::ScopedTempDir cache_dir;
ASSERT_TRUE(cache_dir.CreateUniqueTempDir());
const base::FilePath cache_path = cache_dir.path();
WriteFakeIndexFileV5(cache_path);
const std::string file_contents("incorrectly serialized data");
const base::FilePath index_file = cache_path.AppendASCII(kIndexFileName);
ASSERT_EQ(implicit_cast<int>(file_contents.size()),
base::WriteFile(
index_file, file_contents.data(), file_contents.size()));
// Upgrade.
ASSERT_TRUE(disk_cache::UpgradeSimpleCacheOnDisk(cache_path));
// Check that the version in the fake index file is updated.
std::string new_fake_index_contents;
ASSERT_TRUE(base::ReadFileToString(cache_path.AppendASCII(kFakeIndexFileName),
&new_fake_index_contents));
const disk_cache::FakeIndexData* fake_index_header;
EXPECT_EQ(sizeof(*fake_index_header), new_fake_index_contents.size());
fake_index_header = reinterpret_cast<const disk_cache::FakeIndexData*>(
new_fake_index_contents.data());
EXPECT_EQ(disk_cache::kSimpleVersion, fake_index_header->version);
EXPECT_EQ(kSimpleInitialMagicNumber, fake_index_header->initial_magic_number);
}
TEST(SimpleVersionUpgradeTest, UpgradeV5V6IndexMustDisappear) {
base::ScopedTempDir cache_dir;
ASSERT_TRUE(cache_dir.CreateUniqueTempDir());
const base::FilePath cache_path = cache_dir.path();
WriteFakeIndexFileV5(cache_path);
const std::string file_contents("incorrectly serialized data");
const base::FilePath index_file = cache_path.AppendASCII(kIndexFileName);
ASSERT_EQ(implicit_cast<int>(file_contents.size()),
base::WriteFile(
index_file, file_contents.data(), file_contents.size()));
// Create a few entry-like files.
const uint64 kEntries = 5;
for (uint64 entry_hash = 0; entry_hash < kEntries; ++entry_hash) {
for (int index = 0; index < 3; ++index) {
std::string file_name =
base::StringPrintf("%016" PRIx64 "_%1d", entry_hash, index);
std::string entry_contents =
file_contents +
base::StringPrintf(" %" PRIx64, implicit_cast<uint64>(entry_hash));
ASSERT_EQ(implicit_cast<int>(entry_contents.size()),
base::WriteFile(cache_path.AppendASCII(file_name),
entry_contents.data(),
entry_contents.size()));
}
}
// Upgrade.
ASSERT_TRUE(disk_cache::UpgradeIndexV5V6(cache_path));
// Check that the old index disappeared but the files remain unchanged.
EXPECT_FALSE(base::PathExists(index_file));
for (uint64 entry_hash = 0; entry_hash < kEntries; ++entry_hash) {
for (int index = 0; index < 3; ++index) {
std::string file_name =
base::StringPrintf("%016" PRIx64 "_%1d", entry_hash, index);
std::string expected_contents =
file_contents +
base::StringPrintf(" %" PRIx64, implicit_cast<uint64>(entry_hash));
std::string real_contents;
EXPECT_TRUE(base::ReadFileToString(cache_path.AppendASCII(file_name),
&real_contents));
EXPECT_EQ(expected_contents, real_contents);
}
}
}
} // namespace
#endif // defined(OS_POSIX)
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