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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.
#ifndef CHROME_BROWSER_NAVIGATION_PREDICTOR_ANCHOR_ELEMENT_PRELOADER_H_
#define CHROME_BROWSER_NAVIGATION_PREDICTOR_ANCHOR_ELEMENT_PRELOADER_H_
#include "base/memory/raw_ref.h"
#include "content/public/browser/anchor_element_preconnect_delegate.h"
#include "content/public/browser/document_service.h"
#include "content/public/browser/preloading.h"
#include "url/scheme_host_port.h"
// If you change this, please follow the process in
// go/preloading-dashboard-updates to update the mapping reflected in dashboard,
// or if you are not a Googler, please file an FYI bug on https://crbug.new with
// component Internals>Preload.
//
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
//
// LINT.IfChange
enum class AnchorPreloadingFailureReason {
// Numbering starts from `kPreloadingFailureReasonContentEnd` defined in
// //content/public/preloading.h . Advance numbering by +1 when adding a new
// element.
// The number of allowed anchor element preloading attempts has been exceeded.
// Obsolete (crbug.com/356624837).
//
// kLimitExceeded = static_cast<int>(
// content::PreloadingFailureReason::kPreloadingFailureReasonContentEnd),
};
// LINT.ThenChange()
// Helper function to convert AnchorPreloadingFailureReason to
// content::PreloadingFailureReason without casting.
content::PreloadingFailureReason ToFailureReason(
AnchorPreloadingFailureReason reason);
class AnchorElementPreloader : public content::AnchorElementPreconnectDelegate {
public:
explicit AnchorElementPreloader(content::RenderFrameHost& render_frame_host);
~AnchorElementPreloader() override;
// Disallows copy and move operations.
AnchorElementPreloader(const AnchorElementPreloader&) = delete;
AnchorElementPreloader& operator=(const AnchorElementPreloader&) = delete;
AnchorElementPreloader(AnchorElementPreloader&&) = delete;
AnchorElementPreloader& operator=(AnchorElementPreloader&&) = delete;
// Preconnects to the given URL `target`.
void MaybePreconnect(const GURL& target) override;
private:
// content::PreloadingDecider, which inherits content::DocumentUserData, owns
// `this`, so `this` can access `render_frame_host_` safely.
const raw_ref<content::RenderFrameHost> render_frame_host_;
std::set<url::SchemeHostPort> preconnected_targets_;
};
#endif // CHROME_BROWSER_NAVIGATION_PREDICTOR_ANCHOR_ELEMENT_PRELOADER_H_
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