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* 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 <string>
#include <vector>
#include "api/data_channel_interface.h"
#include "api/rtc_error.h"
#include "api/scoped_refptr.h"
#include "api/sequence_checker.h"
#include "api/task_queue/pending_task_safety_flag.h"
#include "api/transport/data_channel_transport_interface.h"
#include "pc/data_channel_utils.h"
#include "pc/sctp_data_channel.h"
#include "rtc_base/checks.h"
#include "rtc_base/copy_on_write_buffer.h"
#include "rtc_base/ssl_stream_adapter.h"
#include "rtc_base/thread.h"
#include "rtc_base/thread_annotations.h"
#include "rtc_base/weak_ptr.h"
namespace webrtc {
class PeerConnectionInternal;
class DataChannelController : public SctpDataChannelControllerInterface,
public DataChannelSink {
explicit DataChannelController(PeerConnectionInternal* 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
// SctpDataChannelProviderInterface.
RTCError SendData(StreamId sid,
const SendDataParams& params,
const rtc::CopyOnWriteBuffer& payload) override;
void AddSctpDataStream(StreamId sid) override;
void RemoveSctpDataStream(StreamId sid) override;
void OnChannelStateChanged(SctpDataChannel* channel,
DataChannelInterface::DataState state) override;
size_t buffered_amount(StreamId sid) const override;
size_t buffered_amount_low_threshold(StreamId sid) const override;
void SetBufferedAmountLowThreshold(StreamId sid, size_t bytes) 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(RTCError error) override;
void OnBufferedAmountLow(int channel_id) override;
// Called as part of destroying the owning PeerConnection.
void PrepareForShutdown();
// Called from PeerConnection::SetupDataChannelTransport_n
void SetupDataChannelTransport_n(DataChannelTransportInterface* transport);
// Called from PeerConnection::TeardownDataChannelTransport_n
void TeardownDataChannelTransport_n(RTCError error);
// Called from PeerConnection::OnTransportChanged
// to make required changes to datachannels' transports.
void OnTransportChanged(
DataChannelTransportInterface* data_channel_transport);
// Called from PeerConnection::GetDataChannelStats on the signaling thread.
std::vector<DataChannelStats> GetDataChannelStats() const;
// Creates channel and adds it to the collection of DataChannels that will
// be offered in a SessionDescription, and wraps it in a proxy object.
InternalCreateDataChannelWithProxy(const std::string& label,
const InternalDataChannelInit& config);
void AllocateSctpSids(rtc::SSLRole role);
// Check if data channels are currently tracked. Used to decide whether a
// rejected m=application section should be reoffered.
bool HasDataChannels() const;
// At some point in time, a data channel has existed.
bool HasUsedDataChannels() const;
rtc::Thread* network_thread() const;
rtc::Thread* signaling_thread() const;
void OnSctpDataChannelClosed(SctpDataChannel* channel);
// Creates a new SctpDataChannel object on the network thread.
RTCErrorOr<rtc::scoped_refptr<SctpDataChannel>> CreateDataChannel(
const std::string& label,
InternalDataChannelInit& config) RTC_RUN_ON(network_thread());
// Parses and handles open messages. Returns true if the message is an open
// message and should be considered to be handled, false otherwise.
bool HandleOpenMessage_n(int channel_id,
DataMessageType type,
const rtc::CopyOnWriteBuffer& buffer)
// Called when a valid data channel OPEN message is received.
void OnDataChannelOpenMessage(rtc::scoped_refptr<SctpDataChannel> channel,
bool ready_to_send)
// Accepts a `StreamId` which may be pre-negotiated or unassigned. For
// pre-negotiated sids, attempts to reserve the sid in the allocation pool,
// for unassigned sids attempts to generate a new sid if possible. Returns
// RTCError::OK() if the sid is reserved (and may have been generated) or
// if not enough information exists to generate a sid, in which case the sid
// will still be unassigned upon return, but will be assigned later.
// If the pool has been exhausted or a sid has already been reserved, an
// error will be returned.
RTCError ReserveOrAllocateSid(absl::optional<StreamId>& sid,
absl::optional<rtc::SSLRole> fallback_ssl_role)
// Called when all data channels need to be notified of a transport channel
// (calls OnTransportChannelCreated on the signaling thread).
void NotifyDataChannelsOfTransportCreated();
void set_data_channel_transport(DataChannelTransportInterface* transport);
// 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.
DataChannelTransportInterface* data_channel_transport_
RTC_GUARDED_BY(network_thread()) = nullptr;
SctpSidAllocator sid_allocator_ RTC_GUARDED_BY(network_thread());
std::vector<rtc::scoped_refptr<SctpDataChannel>> sctp_data_channels_n_
enum class DataChannelUsage : uint8_t {
kNeverUsed = 0,
DataChannelUsage channel_usage_ RTC_GUARDED_BY(signaling_thread()) =
// Owning PeerConnection.
PeerConnectionInternal* const pc_;
// The weak pointers must be dereferenced and invalidated on the network
// thread only.
rtc::WeakPtrFactory<DataChannelController> weak_factory_
ScopedTaskSafety signaling_safety_;
} // namespace webrtc