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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "data_saver.h"
#include <optional>
#include "base/feature_list.h"
#include "base/metrics/histogram_functions.h"
#include "base/task/thread_pool.h"
#include "base/time/time.h"
#if BUILDFLAG(IS_ANDROID)
#include "chrome/android/chrome_jni_headers/DataSaverOSSetting_jni.h"
#endif
namespace {
std::optional<bool> g_override_data_saver_for_testing;
#if BUILDFLAG(IS_ANDROID)
// Whether the Data Saver Android setting was set last time we checked it.
// This can be a global variable because this is an OS setting that does not
// vary based on Chrome profiles.
std::optional<bool> g_cached_data_saver_setting;
base::TimeTicks g_last_setting_check_time;
bool IsDataSaverEnabledBlockingCall() {
JNIEnv* env = jni_zero::AttachCurrentThread();
return datareduction::android::Java_DataSaverOSSetting_isDataSaverEnabled(
env);
}
#endif
} // namespace
namespace data_saver {
void OverrideIsDataSaverEnabledForTesting(bool flag) {
g_override_data_saver_for_testing = flag;
}
void ResetIsDataSaverEnabledForTesting() {
g_override_data_saver_for_testing = std::nullopt;
}
void FetchDataSaverOSSettingAsynchronously() {
#if BUILDFLAG(IS_ANDROID)
g_last_setting_check_time = base::TimeTicks::Now();
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, base::BindOnce(IsDataSaverEnabledBlockingCall),
base::BindOnce([](bool data_saver_enabled) {
g_cached_data_saver_setting = data_saver_enabled;
}));
#endif
}
bool IsDataSaverEnabled() {
if (g_override_data_saver_for_testing.has_value()) {
return g_override_data_saver_for_testing.value();
}
#if BUILDFLAG(IS_ANDROID)
if (!g_cached_data_saver_setting) {
// No cached value, so block until we find the result. Note that
// FetchDataSaverOSSettingAsynchronously is called on startup, so we
// expect this case to rarely happen.
g_cached_data_saver_setting = IsDataSaverEnabledBlockingCall();
return g_cached_data_saver_setting.value();
}
// There is a cached value.
if (base::TimeTicks::Now() - g_last_setting_check_time > base::Seconds(1)) {
// It's been more than one second since we checked the OS setting. Update
// it asynchronously and return the cached value immediately.
FetchDataSaverOSSettingAsynchronously();
}
DCHECK(g_cached_data_saver_setting);
return g_cached_data_saver_setting.value();
#else
return false;
#endif
}
} // namespace data_saver
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