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// Copyright 2025 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/search_preload/search_preload_service.h"
#include "base/metrics/histogram_functions.h"
#include "chrome/browser/preloading/search_preload/search_preload_features.h"
#include "chrome/browser/preloading/search_preload/search_preload_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/search_engines/template_url_service_factory.h"
#include "components/omnibox/browser/autocomplete_match.h"
#include "components/omnibox/browser/autocomplete_result.h"
#include "components/omnibox/browser/omnibox.mojom-shared.h"
#include "components/search_engines/template_url_service.h"
#include "content/public/browser/web_contents.h"
#include "services/network/public/mojom/no_vary_search.mojom.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
namespace {
net::HttpNoVarySearchData ParseHttpNoVarySearchDataFromMojom(
const network::mojom::NoVarySearchPtr& no_vary_search_ptr) {
if (no_vary_search_ptr->search_variance->is_vary_params()) {
return net::HttpNoVarySearchData::CreateFromVaryParams(
no_vary_search_ptr->search_variance->get_vary_params(),
no_vary_search_ptr->vary_on_key_order);
}
return net::HttpNoVarySearchData::CreateFromNoVaryParams(
no_vary_search_ptr->search_variance->get_no_vary_params(),
no_vary_search_ptr->vary_on_key_order);
}
} // namespace
// static
SearchPreloadService* SearchPreloadService::GetForProfile(Profile* profile) {
return SearchPreloadServiceFactory::GetForProfile(profile);
}
SearchPreloadService::SearchPreloadService(Profile* profile)
: profile_(profile) {
CHECK(features::IsDsePreload2Enabled());
auto* template_url_service =
TemplateURLServiceFactory::GetForProfile(profile_);
CHECK(template_url_service);
observer_.Observe(template_url_service);
}
SearchPreloadService::~SearchPreloadService() = default;
void SearchPreloadService::Shutdown() {
ClearPreloads();
observer_.Reset();
}
void SearchPreloadService::OnTemplateURLServiceChanged() {
ClearPreloads();
}
void SearchPreloadService::ClearPreloads() {
if (pipeline_manager_.has_value() && pipeline_manager_.value()) {
pipeline_manager_.value()->ClearPreloads();
}
pipeline_manager_.reset();
}
void SearchPreloadService::OnPrefetchHeadReceived(
const network::mojom::URLResponseHead& head) {
auto no_vary_search_header =
[&]() -> std::optional<net::HttpNoVarySearchData> {
// No No-Vary-Search headers
if (!(head.parsed_headers &&
head.parsed_headers->no_vary_search_with_parse_error)) {
return std::nullopt;
}
// Error
if (head.parsed_headers->no_vary_search_with_parse_error
->is_parse_error()) {
return std::nullopt;
}
// Success
return ParseHttpNoVarySearchDataFromMojom(
head.parsed_headers->no_vary_search_with_parse_error
->get_no_vary_search());
}();
{
SearchPreloadServiceNoVarySearchDataCacheUpdate update;
if (no_vary_search_data_cache_ == no_vary_search_header) {
update = SearchPreloadServiceNoVarySearchDataCacheUpdate::kUnchanged;
} else {
const bool had_value = no_vary_search_data_cache_.has_value();
const bool has_value = no_vary_search_header.has_value();
if (had_value && has_value) {
update = SearchPreloadServiceNoVarySearchDataCacheUpdate::kSomeToSome;
} else if (!had_value && has_value) {
update = SearchPreloadServiceNoVarySearchDataCacheUpdate::kNullToSome;
} else if (had_value && !has_value) {
update = SearchPreloadServiceNoVarySearchDataCacheUpdate::kSomeToNull;
} else {
NOTREACHED();
}
}
base::UmaHistogramEnumeration(
"Omnibox.DsePreload.Prefetch.NoVarySearchDataCacheUpdate", update);
}
// TODO(crbug.com/422074579): Persist it to profile.
if (no_vary_search_data_cache_ != no_vary_search_header) {
no_vary_search_data_cache_ = std::move(no_vary_search_header);
}
}
void SearchPreloadService::OnOnSuggestPrefetchCompletedOrFailed(
const network::URLLoaderCompletionStatus& completion_status,
const std::optional<int>& response_code) {
const bool is_2xx = response_code.has_value() &&
(200 <= response_code && response_code < 300);
if (!is_2xx) {
pause_triggering_until_ = base::TimeTicks::Now() +
features::kDsePreload2ErrorBackoffDuration.Get();
}
}
SearchPreloadPipelineManager&
SearchPreloadService::GetOrCreatePipelineManagerWithLimit(
content::WebContents& web_contents) {
// Allow at most one WebContents to hold preloads.
//
// TODO(crbug.com/394213503): Reconsider the limitation.
const bool is_occupied_with_given_web_contents =
pipeline_manager_.has_value() && pipeline_manager_.value() &&
&pipeline_manager_.value()->GetWebContents() == &web_contents;
if (!is_occupied_with_given_web_contents) {
ClearPreloads();
}
if (!pipeline_manager_.has_value()) {
SearchPreloadPipelineManager::CreateForWebContents(&web_contents);
auto* pipeline_manager =
SearchPreloadPipelineManager::FromWebContents(&web_contents);
CHECK(pipeline_manager);
pipeline_manager_ = pipeline_manager->GetWeakPtr();
}
return *pipeline_manager_.value();
}
void SearchPreloadService::OnAutocompleteResultChanged(
content::WebContents* web_contents,
const AutocompleteResult& result) {
if (!web_contents) {
return;
}
if (base::TimeTicks::Now() < pause_triggering_until_) {
return;
}
GetOrCreatePipelineManagerWithLimit(*web_contents)
.OnAutocompleteResultChanged(*profile_, GetWeakPtr(), result,
no_vary_search_data_cache_);
}
bool SearchPreloadService::OnNavigationLikely(
size_t index,
const AutocompleteMatch& match,
omnibox::mojom::NavigationPredictor navigation_predictor,
content::WebContents* web_contents) {
if (!web_contents) {
return false;
}
if (base::TimeTicks::Now() < pause_triggering_until_) {
return false;
}
return GetOrCreatePipelineManagerWithLimit(*web_contents)
.OnNavigationLikely(*profile_, GetWeakPtr(), match, navigation_predictor,
no_vary_search_data_cache_);
}
const std::optional<net::HttpNoVarySearchData>&
SearchPreloadService::GetNoVarySearchDataCacheForTesting() const {
return no_vary_search_data_cache_;
}
void SearchPreloadService::SetNoVarySearchDataCacheForTesting(
std::optional<net::HttpNoVarySearchData> no_vary_search_data) {
no_vary_search_data_cache_ = std::move(no_vary_search_data);
}
bool SearchPreloadService::InvalidatePipelineForTesting(
content::WebContents& web_contents,
GURL canonical_url) {
return GetOrCreatePipelineManagerWithLimit(web_contents)
.InvalidatePipelineForTesting(canonical_url); // IN-TEST
}
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