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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_SIGNALING_DELEGATING_SIGNAL_STRATEGY_H_
#define REMOTING_SIGNALING_DELEGATING_SIGNAL_STRATEGY_H_
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "remoting/signaling/signal_strategy.h"
#include "remoting/signaling/signaling_address.h"
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace remoting {
// A signaling strategy class that delegates IQ sending and receiving.
//
// Notes on thread safety:
// 1. This object can be created on any thread.
// 2. |send_iq_callback| will always be called on the thread that it is created.
// Note that |send_iq_callback| may be called after this object is destroyed.
// 3. The caller should invoke all methods on the SignalStrategy interface on
// the |client_task_runner|.
// 4. All listeners will be called on |client_task_runner| as well.
// 5. The destructor should always be called on the |client_task_runner|.
// 6. As a result of (5), use MakeIncomingMessageCallback() to obtain a callback
// when passing incoming signaling messages from the delegate. The callback
// can then be invoked at any thread.
class DelegatingSignalStrategy : public SignalStrategy {
public:
typedef base::RepeatingCallback<void(const std::string&)> IqCallback;
DelegatingSignalStrategy(
const SignalingAddress& local_address,
scoped_refptr<base::SingleThreadTaskRunner> client_task_runner,
const IqCallback& send_iq_callback);
DelegatingSignalStrategy(const DelegatingSignalStrategy&) = delete;
DelegatingSignalStrategy& operator=(const DelegatingSignalStrategy&) = delete;
~DelegatingSignalStrategy() override;
IqCallback GetIncomingMessageCallback();
// SignalStrategy interface.
void Connect() override;
void Disconnect() override;
State GetState() const override;
Error GetError() const override;
const SignalingAddress& GetLocalAddress() const override;
void AddListener(Listener* listener) override;
void RemoveListener(Listener* listener) override;
bool SendStanza(std::unique_ptr<jingle_xmpp::XmlElement> stanza) override;
bool SendMessage(const SignalingAddress& destination_address,
const ftl::ChromotingMessage& message) override;
std::string GetNextId() override;
private:
static void OnIncomingMessageFromDelegate(
base::WeakPtr<DelegatingSignalStrategy> weak_ptr,
scoped_refptr<base::SingleThreadTaskRunner> client_task_runner,
const std::string& message);
void OnIncomingMessage(const std::string& message);
SignalingAddress local_address_;
scoped_refptr<base::SingleThreadTaskRunner> delegate_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> client_task_runner_;
IqCallback incoming_iq_callback_;
IqCallback send_iq_callback_;
base::ObserverList<Listener> listeners_;
base::WeakPtrFactory<DelegatingSignalStrategy> weak_factory_{this};
};
} // namespace remoting
#endif // REMOTING_SIGNALING_DELEGATING_SIGNAL_STRATEGY_H_
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