blob: 60bcbb32a879deda9e5559c68292186ad9e800a5 [file] [log] [blame]
* Copyright 2019 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "pc/channel.h"
#include "pc/data_channel.h"
#include "rtc_base/weak_ptr.h"
namespace webrtc {
class PeerConnection;
class DataChannelController : public DataChannelProviderInterface,
public DataChannelSink {
explicit DataChannelController(PeerConnection* pc) : pc_(pc) {}
// Not copyable or movable.
DataChannelController(DataChannelController&) = delete;
DataChannelController& operator=(const DataChannelController& other) = delete;
DataChannelController(DataChannelController&&) = delete;
DataChannelController& operator=(DataChannelController&& other) = delete;
// Implements DataChannelProviderInterface.
bool SendData(const cricket::SendDataParams& params,
const rtc::CopyOnWriteBuffer& payload,
cricket::SendDataResult* result) override;
bool ConnectDataChannel(DataChannel* webrtc_data_channel) override;
void DisconnectDataChannel(DataChannel* webrtc_data_channel) override;
void AddSctpDataStream(int sid) override;
void RemoveSctpDataStream(int sid) override;
bool ReadyToSendData() const override;
// Implements DataChannelSink.
void OnDataReceived(int channel_id,
DataMessageType type,
const rtc::CopyOnWriteBuffer& buffer) override;
void OnChannelClosing(int channel_id) override;
void OnChannelClosed(int channel_id) override;
void OnReadyToSend() override;
void OnTransportClosed() override;
// Called from PeerConnection::SetupDataChannelTransport_n
void SetupDataChannelTransport_n();
// Called from PeerConnection::TeardownDataChannelTransport_n
void TeardownDataChannelTransport_n();
// Called from PeerConnection::OnTransportChanged
// to make required changes to datachannels' transports.
void OnTransportChanged(
DataChannelTransportInterface* data_channel_transport);
// Creates channel and adds it to the collection of DataChannels that will
// be offered in a SessionDescription.
rtc::scoped_refptr<DataChannel> InternalCreateDataChannel(
const std::string& label,
const InternalDataChannelInit*
config) /* RTC_RUN_ON(signaling_thread()) */;
void AllocateSctpSids(rtc::SSLRole role);
DataChannel* FindDataChannelBySid(int sid) const;
// Checks if any data channel has been added.
bool HasDataChannels() const;
bool HasSctpDataChannels() const {
return !sctp_data_channels_.empty();
bool HasRtpDataChannels() const {
return !rtp_data_channels_.empty();
void UpdateLocalRtpDataChannels(const cricket::StreamParamsVec& streams);
void UpdateRemoteRtpDataChannels(const cricket::StreamParamsVec& streams);
// Accessors
cricket::DataChannelType data_channel_type() const {
return data_channel_type_;
void set_data_channel_type(cricket::DataChannelType type) {
data_channel_type_ = type;
cricket::RtpDataChannel* rtp_data_channel() const {
return rtp_data_channel_;
void set_rtp_data_channel(cricket::RtpDataChannel* channel) {
rtp_data_channel_ = channel;
DataChannelTransportInterface* data_channel_transport() const {
return data_channel_transport_;
void set_data_channel_transport(DataChannelTransportInterface* transport) {
data_channel_transport_ = transport;
const std::map<std::string, rtc::scoped_refptr<DataChannel>>*
rtp_data_channels() const {
return &rtp_data_channels_;
const std::vector<rtc::scoped_refptr<DataChannel>>* sctp_data_channels()
const {
return &sctp_data_channels_;
sigslot::signal1<DataChannel*>& SignalDataChannelCreated() {
return SignalDataChannelCreated_;
// Called when the transport for the data channels is closed or destroyed.
void OnTransportChannelClosed();
void OnSctpDataChannelClosed(DataChannel* channel);
// Parses and handles open messages. Returns true if the message is an open
// message, false otherwise.
bool HandleOpenMessage_s(const cricket::ReceiveDataParams& params,
const rtc::CopyOnWriteBuffer& buffer)
// Called when a valid data channel OPEN message is received.
void OnDataChannelOpenMessage(const std::string& label,
const InternalDataChannelInit& config)
void CreateRemoteRtpDataChannel(const std::string& label,
uint32_t remote_ssrc)
void UpdateClosingRtpDataChannels(
const std::vector<std::string>& active_channels,
bool is_local_update) RTC_RUN_ON(signaling_thread());
rtc::Thread* network_thread() const;
rtc::Thread* signaling_thread() const;
// Specifies which kind of data channel is allowed. This is controlled
// by the chrome command-line flag and constraints:
// 1. If chrome command-line switch 'enable-sctp-data-channels' is enabled,
// constraint kEnableDtlsSrtp is true, and constaint kEnableRtpDataChannels is
// not set or false, SCTP is allowed (DCT_SCTP);
// 2. If constraint kEnableRtpDataChannels is true, RTP is allowed (DCT_RTP);
// 3. If both 1&2 are false, data channel is not allowed (DCT_NONE).
cricket::DataChannelType data_channel_type_ =
cricket::DCT_NONE; // TODO( Accessed on both
// signaling and network thread.
// Plugin transport used for data channels. Pointer may be accessed and
// checked from any thread, but the object may only be touched on the
// network thread.
// TODO( Accessed on both signaling and network
// thread.
DataChannelTransportInterface* data_channel_transport_ = nullptr;
// Cached value of whether the data channel transport is ready to send.
bool data_channel_transport_ready_to_send_
RTC_GUARDED_BY(signaling_thread()) = false;
// |rtp_data_channel_| is used if in RTP data channel mode,
// |data_channel_transport_| when using SCTP.
cricket::RtpDataChannel* rtp_data_channel_ = nullptr;
// TODO( Accessed on both
// signaling and some other thread.
SctpSidAllocator sid_allocator_ /* RTC_GUARDED_BY(signaling_thread()) */;
std::vector<rtc::scoped_refptr<DataChannel>> sctp_data_channels_
std::vector<rtc::scoped_refptr<DataChannel>> sctp_data_channels_to_free_
// Map of label -> DataChannel
std::map<std::string, rtc::scoped_refptr<DataChannel>> rtp_data_channels_
// Signals from |data_channel_transport_|. These are invoked on the
// signaling thread.
sigslot::signal1<bool> SignalDataChannelTransportWritable_s
sigslot::signal2<const cricket::ReceiveDataParams&,
const rtc::CopyOnWriteBuffer&>
sigslot::signal1<int> SignalDataChannelTransportChannelClosing_s
sigslot::signal1<int> SignalDataChannelTransportChannelClosed_s
sigslot::signal1<DataChannel*> SignalDataChannelCreated_
// Used to invoke data channel transport signals on the signaling thread.
std::unique_ptr<rtc::AsyncInvoker> data_channel_transport_invoker_
// Owning PeerConnection.
PeerConnection* const pc_;
rtc::WeakPtrFactory<DataChannelController> weak_factory_{this};
} // namespace webrtc