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/*
* Copyright 2022 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 P2P_BASE_ACTIVE_ICE_CONTROLLER_INTERFACE_H_
#define P2P_BASE_ACTIVE_ICE_CONTROLLER_INTERFACE_H_
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "p2p/base/connection.h"
#include "p2p/base/ice_switch_reason.h"
#include "p2p/base/ice_transport_internal.h"
#include "p2p/base/transport_description.h"
namespace cricket {
// ActiveIceControllerInterface defines the methods for a module that actively
// manages the connection used by an ICE transport.
//
// An active ICE controller receives updates from the ICE transport when
// - the connections state is mutated
// - a new connection should be selected as a result of an external event (eg.
// a different connection nominated by the remote peer)
//
// The active ICE controller takes the appropriate decisions and requests the
// ICE agent to perform the necessary actions through the IceAgentInterface.
class ActiveIceControllerInterface {
public:
virtual ~ActiveIceControllerInterface() = default;
// Sets the current ICE configuration.
virtual void SetIceConfig(const IceConfig& config) = 0;
// Called when a new connection is added to the ICE transport.
virtual void OnConnectionAdded(const Connection* connection) = 0;
// Called when the transport switches that connection in active use.
virtual void OnConnectionSwitched(const Connection* connection) = 0;
// Called when a connection is destroyed.
virtual void OnConnectionDestroyed(const Connection* connection) = 0;
// Called when a STUN ping has been sent on a connection. This does not
// indicate that a STUN response has been received.
virtual void OnConnectionPinged(const Connection* connection) = 0;
// Called when one of the following changes for a connection.
// - rtt estimate
// - write state
// - receiving
// - connected
// - nominated
virtual void OnConnectionUpdated(const Connection* connection) = 0;
// Compute "STUN_ATTR_USE_CANDIDATE" for a STUN ping on the given connection.
virtual bool GetUseCandidateAttribute(const Connection* connection,
NominationMode mode,
IceMode remote_ice_mode) const = 0;
// Called to enque a request to pick and switch to the best available
// connection.
virtual void OnSortAndSwitchRequest(IceSwitchReason reason) = 0;
// Called to pick and switch to the best available connection immediately.
virtual void OnImmediateSortAndSwitchRequest(IceSwitchReason reason) = 0;
// Called to switch to the given connection immediately without checking for
// the best available connection.
virtual bool OnImmediateSwitchRequest(IceSwitchReason reason,
const Connection* selected) = 0;
// Only for unit tests
virtual const Connection* FindNextPingableConnection() = 0;
};
} // namespace cricket
#endif // P2P_BASE_ACTIVE_ICE_CONTROLLER_INTERFACE_H_
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