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// Copyright 2019 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/navigation_predictor/navigation_predictor_keyed_service.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/json/json_writer.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/histogram_macros_local.h"
#include "base/observer_list.h"
#include "base/time/default_tick_clock.h"
#include "base/values.h"
#include "build/build_config.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "third_party/blink/public/mojom/devtools/console_message.mojom.h"
namespace {
void WritePredictionToConsoleLog(
const NavigationPredictorKeyedService::Prediction& prediction) {
if (!prediction.web_contents())
return;
base::Value::Dict message;
base::Value::List url_list;
for (const GURL& url : prediction.sorted_predicted_urls()) {
url_list.Append(url.spec());
}
message.Set("predictions", std::move(url_list));
if (prediction.source_document_url()) {
message.Set("source_url", prediction.source_document_url()->spec());
}
std::string json_body;
if (!base::JSONWriter::Write(message, &json_body)) {
NOTREACHED();
}
prediction.web_contents()->GetPrimaryMainFrame()->AddMessageToConsole(
blink::mojom::ConsoleMessageLevel::kInfo,
"JSON Navigation Prediction: " + json_body);
}
} // namespace
NavigationPredictorKeyedService::Prediction::Prediction(
content::WebContents* web_contents,
const std::optional<GURL>& source_document_url,
PredictionSource prediction_source,
const std::vector<GURL>& sorted_predicted_urls)
: web_contents_(web_contents),
source_document_url_(source_document_url),
prediction_source_(prediction_source),
sorted_predicted_urls_(sorted_predicted_urls) {
DCHECK_EQ(prediction_source_,
PredictionSource::kAnchorElementsParsedFromWebPage);
DCHECK(!source_document_url->is_empty());
}
NavigationPredictorKeyedService::Prediction::Prediction(
const NavigationPredictorKeyedService::Prediction& other)
: web_contents_(other.web_contents_),
prediction_source_(other.prediction_source_) {
// Use non-default copy constructor operator that does deep-copy.
source_document_url_ = other.source_document_url_;
sorted_predicted_urls_.reserve(other.sorted_predicted_urls_.size());
for (const auto& entry : other.sorted_predicted_urls_)
sorted_predicted_urls_.push_back(entry);
}
NavigationPredictorKeyedService::Prediction&
NavigationPredictorKeyedService::Prediction::operator=(
const NavigationPredictorKeyedService::Prediction& other) {
// Use non-default assignment operator that does deep-copy.
web_contents_ = other.web_contents_;
source_document_url_.reset();
source_document_url_ = other.source_document_url_;
prediction_source_ = other.prediction_source_;
sorted_predicted_urls_.clear();
sorted_predicted_urls_.reserve(other.sorted_predicted_urls_.size());
for (const auto& entry : other.sorted_predicted_urls_)
sorted_predicted_urls_.push_back(entry);
return *this;
}
NavigationPredictorKeyedService::Prediction::~Prediction() = default;
const std::optional<GURL>&
NavigationPredictorKeyedService::Prediction::source_document_url() const {
DCHECK_EQ(PredictionSource::kAnchorElementsParsedFromWebPage,
prediction_source_);
return source_document_url_;
}
const std::vector<GURL>&
NavigationPredictorKeyedService::Prediction::sorted_predicted_urls() const {
return sorted_predicted_urls_;
}
content::WebContents*
NavigationPredictorKeyedService::Prediction::web_contents() const {
DCHECK_EQ(PredictionSource::kAnchorElementsParsedFromWebPage,
prediction_source_);
return web_contents_;
}
NavigationPredictorKeyedService::NavigationPredictorKeyedService(
content::BrowserContext* browser_context)
: search_engine_preconnector_(browser_context) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(!browser_context->IsOffTheRecord());
#if !BUILDFLAG(IS_ANDROID)
if (!SearchEnginePreconnector::ShouldBeEnabledAsKeyedService()) {
// Start preconnecting to the search engine.
search_engine_preconnector_.StartPreconnecting(/*with_startup_delay=*/true);
}
#endif
}
NavigationPredictorKeyedService::~NavigationPredictorKeyedService() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
}
void NavigationPredictorKeyedService::OnPredictionUpdated(
content::WebContents* web_contents,
const GURL& document_url,
PredictionSource prediction_source,
const std::vector<GURL>& sorted_predicted_urls) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// Currently, this method is called only for anchor elements parsed from
// webpage.
DCHECK_EQ(PredictionSource::kAnchorElementsParsedFromWebPage,
prediction_source);
last_prediction_ = Prediction(web_contents, document_url, prediction_source,
sorted_predicted_urls);
for (auto& observer : observer_list_) {
observer.OnPredictionUpdated(last_prediction_.value());
}
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
"console-log-json-navigation-predictions-for-testing")) {
WritePredictionToConsoleLog(last_prediction_.value());
}
}
void NavigationPredictorKeyedService::AddObserver(Observer* observer) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
observer_list_.AddObserver(observer);
if (last_prediction_.has_value()) {
observer->OnPredictionUpdated(last_prediction_.value());
}
}
void NavigationPredictorKeyedService::RemoveObserver(Observer* observer) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
observer_list_.RemoveObserver(observer);
}
SearchEnginePreconnector*
NavigationPredictorKeyedService::search_engine_preconnector() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
return &search_engine_preconnector_;
}
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