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// Copyright 2015 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_PROTOCOL_WEBRTC_DATA_STREAM_ADAPTER_H_
#define REMOTING_PROTOCOL_WEBRTC_DATA_STREAM_ADAPTER_H_
#include <memory>
#include <string>
#include "base/containers/queue.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "remoting/protocol/message_pipe.h"
#include "third_party/webrtc/api/peer_connection_interface.h"
#include "third_party/webrtc/rtc_base/ref_count.h"
namespace remoting::protocol {
// WebrtcDataStreamAdapter implements MessagePipe for WebRTC data channels.
class WebrtcDataStreamAdapter : public MessagePipe,
public webrtc::DataChannelObserver {
public:
explicit WebrtcDataStreamAdapter(
webrtc::scoped_refptr<webrtc::DataChannelInterface> channel);
WebrtcDataStreamAdapter(const WebrtcDataStreamAdapter&) = delete;
WebrtcDataStreamAdapter& operator=(const WebrtcDataStreamAdapter&) = delete;
~WebrtcDataStreamAdapter() override;
std::string name() { return channel_->label(); }
// MessagePipe interface.
void Start(EventHandler* event_handler) override;
void Send(google::protobuf::MessageLite* message,
base::OnceClosure done) override;
private:
enum class State { CONNECTING, OPEN, CLOSED };
struct PendingMessage {
PendingMessage(webrtc::DataBuffer buffer, base::OnceClosure done_callback);
PendingMessage(PendingMessage&&);
~PendingMessage();
PendingMessage& operator=(PendingMessage&&);
webrtc::DataBuffer buffer;
base::OnceClosure done_callback;
};
void SendMessagesIfReady();
// webrtc::DataChannelObserver interface.
void OnStateChange() override;
void OnMessage(const webrtc::DataBuffer& buffer) override;
void OnBufferedAmountChange(uint64_t previous_amount) override;
bool IsOkToCallOnTheNetworkThread() override;
// Helpers for calling EventHandler methods asynchronously.
// webrtc::DataChannelObserver can be called synchronously mid-operation
// (e.g., in the middle of a Send operation). As such, it is important to let
// the stack unwind before doing any real work. Since this class doesn't
// control the EventHandler implementation, the safest approach is always to
// call the latter's methods asynchronously.
void InvokeOpenEvent();
void InvokeClosedEvent();
void InvokeMessageEvent(std::unique_ptr<CompoundBuffer> buffer);
void HandleIncomingMessages();
webrtc::scoped_refptr<webrtc::DataChannelInterface> channel_;
raw_ptr<EventHandler> event_handler_ = nullptr;
State state_ = State::CONNECTING;
// Queue for unhandled incoming messages.
base::queue<std::unique_ptr<CompoundBuffer>> pending_incoming_messages_;
// The data and done callbacks for queued but not yet sent messages.
base::queue<PendingMessage> pending_outgoing_messages_;
base::OnceClosure pending_open_callback_;
base::WeakPtrFactory<WebrtcDataStreamAdapter> weak_ptr_factory_{this};
};
} // namespace remoting::protocol
#endif // REMOTING_PROTOCOL_WEBRTC_DATA_STREAM_ADAPTER_H_
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