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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.
*/
#ifndef PC_SCTP_TRANSPORT_H_
#define PC_SCTP_TRANSPORT_H_
#include <memory>
#include "api/dtls_transport_interface.h"
#include "api/scoped_refptr.h"
#include "api/sctp_transport_interface.h"
#include "api/sequence_checker.h"
#include "api/transport/data_channel_transport_interface.h"
#include "media/sctp/sctp_transport_internal.h"
#include "p2p/base/dtls_transport_internal.h"
#include "pc/dtls_transport.h"
#include "rtc_base/checks.h"
#include "rtc_base/thread.h"
#include "rtc_base/thread_annotations.h"
namespace webrtc {
// This implementation wraps a cricket::SctpTransport, and takes
// ownership of it.
// This object must be constructed and updated on the networking thread,
// the same thread as the one the cricket::SctpTransportInternal object
// lives on.
class SctpTransport : public SctpTransportInterface,
public DataChannelTransportInterface {
public:
explicit SctpTransport(
std::unique_ptr<cricket::SctpTransportInternal> internal);
// SctpTransportInterface
rtc::scoped_refptr<DtlsTransportInterface> dtls_transport() const override;
SctpTransportInformation Information() const override;
void RegisterObserver(SctpTransportObserverInterface* observer) override;
void UnregisterObserver() override;
// DataChannelTransportInterface
RTCError OpenChannel(int channel_id) override;
RTCError SendData(int channel_id,
const SendDataParams& params,
const rtc::CopyOnWriteBuffer& buffer) override;
RTCError CloseChannel(int channel_id) override;
void SetDataSink(DataChannelSink* sink) override;
bool IsReadyToSend() const override;
// Internal functions
void Clear();
void SetDtlsTransport(rtc::scoped_refptr<DtlsTransport>);
// Initialize the cricket::SctpTransport. This can be called from
// the signaling thread.
void Start(int local_port, int remote_port, int max_message_size);
// TODO(https://bugs.webrtc.org/10629): Move functions that need
// internal() to be functions on the SctpTransport interface,
// and make the internal() function private.
cricket::SctpTransportInternal* internal() {
RTC_DCHECK_RUN_ON(owner_thread_);
return internal_sctp_transport_.get();
}
const cricket::SctpTransportInternal* internal() const {
RTC_DCHECK_RUN_ON(owner_thread_);
return internal_sctp_transport_.get();
}
protected:
~SctpTransport() override;
private:
void UpdateInformation(SctpTransportState state);
void OnInternalReadyToSendData();
void OnAssociationChangeCommunicationUp();
void OnInternalClosingProcedureStartedRemotely(int sid);
void OnInternalClosingProcedureComplete(int sid);
void OnDtlsStateChange(cricket::DtlsTransportInternal* transport,
DtlsTransportState state);
// NOTE: `owner_thread_` is the thread that the SctpTransport object is
// constructed on. In the context of PeerConnection, it's the network thread.
rtc::Thread* const owner_thread_;
SctpTransportInformation info_ RTC_GUARDED_BY(owner_thread_);
std::unique_ptr<cricket::SctpTransportInternal> internal_sctp_transport_
RTC_GUARDED_BY(owner_thread_);
SctpTransportObserverInterface* observer_ RTC_GUARDED_BY(owner_thread_) =
nullptr;
rtc::scoped_refptr<DtlsTransport> dtls_transport_
RTC_GUARDED_BY(owner_thread_);
};
} // namespace webrtc
#endif // PC_SCTP_TRANSPORT_H_
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