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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 "absl/types/optional.h"
#include "api/dtls_transport_interface.h"
#include "api/rtc_error.h"
#include "api/scoped_refptr.h"
#include "rtc_base/ref_count.h"
namespace webrtc {
// States of a SCTP transport, corresponding to the JS API specification.
enum class SctpTransportState {
kNew, // Has not started negotiating yet. Non-standard state.
kConnecting, // In the process of negotiating an association.
kConnected, // Completed negotiation of an association.
kClosed, // Closed by local or remote party.
// This object gives snapshot information about the changeable state of a
// SctpTransport.
// It reflects the readonly attributes of the object in the specification.
class RTC_EXPORT SctpTransportInformation {
explicit SctpTransportInformation(SctpTransportState state);
SctpTransportState state,
rtc::scoped_refptr<DtlsTransportInterface> dtls_transport,
absl::optional<double> max_message_size,
absl::optional<int> max_channels);
// The DTLS transport that supports this SCTP transport.
rtc::scoped_refptr<DtlsTransportInterface> dtls_transport() const {
return dtls_transport_;
SctpTransportState state() const { return state_; }
absl::optional<double> MaxMessageSize() const { return max_message_size_; }
absl::optional<int> MaxChannels() const { return max_channels_; }
SctpTransportState state_;
rtc::scoped_refptr<DtlsTransportInterface> dtls_transport_;
absl::optional<double> max_message_size_;
absl::optional<int> max_channels_;
class SctpTransportObserverInterface {
// This callback carries information about the state of the transport.
// The argument is a pass-by-value snapshot of the state.
// The callback will be called on the network thread.
virtual void OnStateChange(SctpTransportInformation info) = 0;
virtual ~SctpTransportObserverInterface() = default;
// A SCTP transport, as represented to the outside world.
// This object is created on the network thread, and can only be
// accessed on that thread, except for functions explicitly marked otherwise.
// References can be held by other threads, and destruction can therefore
// be initiated by other threads.
class SctpTransportInterface : public rtc::RefCountInterface {
// This function can be called from other threads.
virtual rtc::scoped_refptr<DtlsTransportInterface> dtls_transport() const = 0;
// Returns information on the state of the SctpTransport.
// This function can be called from other threads.
virtual SctpTransportInformation Information() const = 0;
// Observer management.
virtual void RegisterObserver(SctpTransportObserverInterface* observer) = 0;
virtual void UnregisterObserver() = 0;
} // namespace webrtc