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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/metrics/persistent_histogram_storage.h"
#include <memory>
#include "base/files/file_enumerator.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/persistent_histogram_allocator.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
// Name of the allocator for storing histograms.
constexpr char kTestHistogramAllocatorName[] = "TestMetrics";
} // namespace
class PersistentHistogramStorageTest : public testing::Test {
public:
PersistentHistogramStorageTest(const PersistentHistogramStorageTest&) =
delete;
PersistentHistogramStorageTest& operator=(
const PersistentHistogramStorageTest&) = delete;
protected:
PersistentHistogramStorageTest() = default;
~PersistentHistogramStorageTest() override = default;
// Creates a unique temporary directory, and sets the test storage directory.
void SetUp() override {
ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
test_storage_dir_ =
temp_dir_path().AppendASCII(kTestHistogramAllocatorName);
}
void TearDown() override {
// Clean up for subsequent tests.
GlobalHistogramAllocator::ReleaseForTesting();
}
// Gets the path to the temporary directory.
const FilePath& temp_dir_path() { return temp_dir_.GetPath(); }
const FilePath& test_storage_dir() { return test_storage_dir_; }
private:
// A temporary directory where all file IO operations take place.
ScopedTempDir temp_dir_;
// The directory into which metrics files are written.
FilePath test_storage_dir_;
};
#if !BUILDFLAG(IS_NACL)
TEST_F(PersistentHistogramStorageTest, HistogramWriteTest) {
auto persistent_histogram_storage =
std::make_unique<PersistentHistogramStorage>(
kTestHistogramAllocatorName,
PersistentHistogramStorage::StorageDirManagement::kCreate);
persistent_histogram_storage->set_storage_base_dir(temp_dir_path());
// Log some random data.
UmaHistogramBoolean("Some.Test.Metric", true);
// Deleting the object causes the data to be written to the disk.
persistent_histogram_storage.reset();
// The storage directory and the histogram file are created during the
// destruction of the PersistentHistogramStorage instance.
EXPECT_TRUE(DirectoryExists(test_storage_dir()));
EXPECT_FALSE(IsDirectoryEmpty(test_storage_dir()));
}
TEST_F(PersistentHistogramStorageTest, TimeCreationTest) {
// Tests that we can create several PersistentHistogramStorage instances in
// close time proximity and correctly end with several different files.
constexpr int kNumStorageInstances = 3;
for (int i = 0; i < kNumStorageInstances; ++i) {
auto persistent_histogram_storage =
std::make_unique<PersistentHistogramStorage>(
kTestHistogramAllocatorName,
PersistentHistogramStorage::StorageDirManagement::kCreate);
persistent_histogram_storage->set_storage_base_dir(temp_dir_path());
// Log some random data.
UmaHistogramBoolean("Some.Test.Metric", true);
// Deleting the object causes the data to be written to the disk.
persistent_histogram_storage.reset();
// We need the global allocator to allow us to create a new instance.
GlobalHistogramAllocator::ReleaseForTesting();
}
// The storage directory and the histogram file are created during the
// destruction of the PersistentHistogramStorage instance.
EXPECT_TRUE(DirectoryExists(test_storage_dir()));
EXPECT_FALSE(IsDirectoryEmpty(test_storage_dir()));
// We should have |kNumStorageInstances| histogram files in the directory.
FileEnumerator enumerator(
test_storage_dir(), /*recursive=*/false, FileEnumerator::FILES,
FilePath(FILE_PATH_LITERAL("*"))
.AddExtension(PersistentMemoryAllocator::kFileExtension)
.value());
int num_files = 0;
for (auto file = enumerator.Next(); !file.empty(); file = enumerator.Next()) {
++num_files;
}
EXPECT_EQ(num_files, kNumStorageInstances);
}
#endif // !BUILDFLAG(IS_NACL)
} // namespace base
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