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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/preloading/prefetch/search_prefetch/field_trial_settings.h"
#include <string>
#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
#include "base/system/sys_info.h"
#include "net/base/features.h"
namespace {
size_t g_cache_size_for_testing = 0;
} // namespace
BASE_FEATURE(kSearchPrefetchServicePrefetching,
"SearchPrefetchServicePrefetching",
base::FEATURE_ENABLED_BY_DEFAULT);
BASE_FEATURE(kSearchPrefetchWithNoVarySearchDiskCache,
"SearchPrefetchWithNoVarySearchDiskCache",
base::FEATURE_DISABLED_BY_DEFAULT);
bool SearchPrefetchServicePrefetchingIsEnabled() {
if (!base::FeatureList::IsEnabled(kSearchPrefetchServicePrefetching)) {
return false;
}
return base::SysInfo::AmountOfPhysicalMemoryMB() >
base::GetFieldTrialParamByFeatureAsInt(
kSearchPrefetchServicePrefetching, "device_memory_threshold_MB",
3000);
}
base::TimeDelta SearchPrefetchCachingLimit() {
return base::Milliseconds(base::GetFieldTrialParamByFeatureAsInt(
kSearchPrefetchServicePrefetching, "prefetch_caching_limit_ms", 60000));
}
size_t SearchPrefetchMaxAttemptsPerCachingDuration() {
return base::GetFieldTrialParamByFeatureAsInt(
kSearchPrefetchServicePrefetching, "max_attempts_per_caching_duration",
7);
}
base::TimeDelta SearchPrefetchErrorBackoffDuration() {
return base::Milliseconds(base::GetFieldTrialParamByFeatureAsInt(
kSearchPrefetchServicePrefetching, "error_backoff_duration_ms", 60000));
}
size_t SearchPrefetchMaxCacheEntries() {
if (g_cache_size_for_testing > 0) {
return g_cache_size_for_testing;
}
return base::GetFieldTrialParamByFeatureAsInt(
kSearchPrefetchServicePrefetching, "cache_size", 10);
}
void SetSearchPrefetchMaxCacheEntriesForTesting(size_t cache_size) {
g_cache_size_for_testing = cache_size;
}
BASE_FEATURE(kSearchNavigationPrefetch,
"SearchNavigationPrefetch",
#if BUILDFLAG(IS_ANDROID)
base::FEATURE_ENABLED_BY_DEFAULT
#else
base::FEATURE_DISABLED_BY_DEFAULT
#endif // BUILDFLAG(IS_ANDROID)
);
const base::FeatureParam<std::string> kSuggestPrefetchParam{
&kSearchNavigationPrefetch, "suggest_prefetch_param", "cs"};
const base::FeatureParam<std::string> kNavigationPrefetchParam{
&kSearchNavigationPrefetch, "navigation_prefetch_param", "op"};
bool IsSearchNavigationPrefetchEnabled() {
return base::FeatureList::IsEnabled(kSearchNavigationPrefetch);
}
bool IsUpOrDownArrowPrefetchEnabled() {
return base::GetFieldTrialParamByFeatureAsBool(kSearchNavigationPrefetch,
"up_or_down_arrow", true);
}
bool IsSearchMouseDownPrefetchEnabled() {
return base::GetFieldTrialParamByFeatureAsBool(kSearchNavigationPrefetch,
"mouse_down", true);
}
bool IsTouchDownPrefetchEnabled() {
return base::GetFieldTrialParamByFeatureAsBool(kSearchNavigationPrefetch,
"touch_down", true);
}
bool AllowTopNavigationPrefetch() {
return base::GetFieldTrialParamByFeatureAsBool(kSearchNavigationPrefetch,
"allow_top_selection", true);
}
bool PrefetchSearchHistorySuggestions() {
return base::GetFieldTrialParamByFeatureAsBool(
kSearchNavigationPrefetch, "prefetch_search_history", true);
}
BASE_FEATURE(kSearchPrefetchOnlyAllowDefaultMatchPreloading,
"SearchPrefetchOnlyAllowDefaultMatchPreloading",
base::FEATURE_ENABLED_BY_DEFAULT);
bool OnlyAllowDefaultMatchPreloading() {
return base::FeatureList::IsEnabled(
kSearchPrefetchOnlyAllowDefaultMatchPreloading);
}
bool IsNoVarySearchDiskCacheEnabled() {
return base::FeatureList::IsEnabled(net::features::kHttpCacheNoVarySearch) &&
base::FeatureList::IsEnabled(kSearchPrefetchWithNoVarySearchDiskCache);
}
bool IsPrefetchIncognitoEnabled() {
return SearchPrefetchServicePrefetchingIsEnabled() &&
IsSearchNavigationPrefetchEnabled() &&
base::GetFieldTrialParamByFeatureAsBool(kSearchNavigationPrefetch,
"allow_incognito", false);
}
BASE_FEATURE(kAutocompleteDictionaryPreload,
"AutocompleteDictionaryPreload",
base::FEATURE_ENABLED_BY_DEFAULT);
const base::FeatureParam<base::TimeDelta>
kAutocompletePreloadedDictionaryTimeout{
&kAutocompleteDictionaryPreload,
"autocomplete_preloaded_dictionary_timeout", base::Milliseconds(60000)};
BASE_FEATURE(kSuppressesSearchPrefetchOnSlowNetwork,
"SuppressesSearchPrefetchOnSlowNetwork",
base::FEATURE_DISABLED_BY_DEFAULT);
// Regarding how this number was chosen, see the design doc linked from
// crbug.com/350519234.
const base::FeatureParam<base::TimeDelta>
kSuppressesSearchPrefetchOnSlowNetworkThreshold{
&kSuppressesSearchPrefetchOnSlowNetwork,
"slow_network_threshold_for_search_prefetch", base::Milliseconds(208)};
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