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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.
#ifndef COMPONENTS_URL_REWRITE_RENDERER_URL_REQUEST_RULES_RECEIVER_H_
#define COMPONENTS_URL_REWRITE_RENDERER_URL_REQUEST_RULES_RECEIVER_H_
#include "base/sequence_checker.h"
#include "base/synchronization/lock.h"
#include "components/url_rewrite/common/url_request_rewrite_rules.h"
#include "mojo/public/cpp/bindings/associated_receiver.h"
#include "mojo/public/cpp/bindings/pending_associated_receiver.h"
namespace content {
class RenderFrame;
} // namespace content
namespace url_rewrite {
// Provides rewriting rules for network requests. This object must be
// destroyed on RenderFrame destruction. This class should only be used on the
// IO thread.
class UrlRequestRulesReceiver : public mojom::UrlRequestRulesReceiver {
public:
explicit UrlRequestRulesReceiver(content::RenderFrame* render_frame);
~UrlRequestRulesReceiver() override;
UrlRequestRulesReceiver(const UrlRequestRulesReceiver&) = delete;
UrlRequestRulesReceiver& operator=(const UrlRequestRulesReceiver&) = delete;
// Returns cached rules. This method may be called from multiple threads (eg
// Blink main and worker threads), hence the method returns the scoped_refptr
// by value, so that the refptr is still valid if changed on the other thread.
//
// Note: The object wrapped by refptr is guaranteed to never change making it
// safe for read access across the threads.
//
// Note: The API should be called every time the rewrite rules are requested
// to make sure the callers get the most up to date rules. The refptr should
// not be cached by callers!
scoped_refptr<UrlRequestRewriteRules> GetCachedRules() const;
private:
void OnUrlRequestRulesReceiverAssociatedReceiver(
mojo::PendingAssociatedReceiver<mojom::UrlRequestRulesReceiver> receiver);
// mojom::UrlRequestRulesReceiver implementation.
void OnRulesUpdated(mojom::UrlRequestRewriteRulesPtr rules) override;
mutable base::Lock lock_;
scoped_refptr<UrlRequestRewriteRules> cached_rules_ GUARDED_BY(lock_);
mojo::AssociatedReceiver<mojom::UrlRequestRulesReceiver>
url_request_rules_receiver_{this};
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace url_rewrite
#endif // COMPONENTS_URL_REWRITE_RENDERER_URL_REQUEST_RULES_RECEIVER_H_
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