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/*
* Copyright (c) 2021 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 NET_DCSCTP_SOCKET_HEARTBEAT_HANDLER_H_
#define NET_DCSCTP_SOCKET_HEARTBEAT_HANDLER_H_
#include <stdint.h>
#include <memory>
#include <string>
#include "absl/strings/string_view.h"
#include "net/dcsctp/packet/chunk/heartbeat_ack_chunk.h"
#include "net/dcsctp/packet/chunk/heartbeat_request_chunk.h"
#include "net/dcsctp/packet/sctp_packet.h"
#include "net/dcsctp/public/dcsctp_options.h"
#include "net/dcsctp/socket/context.h"
#include "net/dcsctp/timer/timer.h"
namespace dcsctp {
// HeartbeatHandler handles all logic around sending heartbeats and receiving
// the responses, as well as receiving incoming heartbeat requests.
//
// Heartbeats are sent on idle connections to ensure that the connection is
// still healthy and to measure the RTT. If a number of heartbeats time out,
// the connection will eventually be closed.
class HeartbeatHandler {
public:
HeartbeatHandler(absl::string_view log_prefix,
const DcSctpOptions& options,
Context* context,
TimerManager* timer_manager);
// Called when the heartbeat interval timer should be restarted. This is
// generally done every time data is sent, which makes the timer expire when
// the connection is idle.
void RestartTimer();
// Called on received HeartbeatRequestChunk chunks.
void HandleHeartbeatRequest(HeartbeatRequestChunk chunk);
// Called on received HeartbeatRequestChunk chunks.
void HandleHeartbeatAck(HeartbeatAckChunk chunk);
private:
absl::optional<DurationMs> OnIntervalTimerExpiry();
absl::optional<DurationMs> OnTimeoutTimerExpiry();
const std::string log_prefix_;
Context* ctx_;
TimerManager* timer_manager_;
// The time for a connection to be idle before a heartbeat is sent.
const DurationMs interval_duration_;
// Adding RTT to the duration will add some jitter, which is good in
// production, but less good in unit tests, which is why it can be disabled.
const bool interval_duration_should_include_rtt_;
const std::unique_ptr<Timer> interval_timer_;
const std::unique_ptr<Timer> timeout_timer_;
};
} // namespace dcsctp
#endif // NET_DCSCTP_SOCKET_HEARTBEAT_HANDLER_H_
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