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It's responsible for answering incoming Heartbeat Requests, and to send requests itself when a connection is idle. When it receives a response, it will measure the RTT and if it doesn't receive a response in time, that will result in a TX error, which will eventually close the connection. Bug: webrtc:12614 Change-Id: I08371d9072ff0461f60e0a2f7696c0fd7ccb57c5 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214129 Reviewed-by: Tommi <tommi@webrtc.org> Commit-Queue: Victor Boivie <boivie@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33828}
69 lines
2.5 KiB
C++
69 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef NET_DCSCTP_SOCKET_HEARTBEAT_HANDLER_H_
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#define NET_DCSCTP_SOCKET_HEARTBEAT_HANDLER_H_
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#include <stdint.h>
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#include <memory>
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#include <string>
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#include "absl/strings/string_view.h"
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#include "net/dcsctp/packet/chunk/heartbeat_ack_chunk.h"
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#include "net/dcsctp/packet/chunk/heartbeat_request_chunk.h"
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#include "net/dcsctp/packet/sctp_packet.h"
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#include "net/dcsctp/public/dcsctp_options.h"
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#include "net/dcsctp/socket/context.h"
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#include "net/dcsctp/timer/timer.h"
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namespace dcsctp {
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// HeartbeatHandler handles all logic around sending heartbeats and receiving
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// the responses, as well as receiving incoming heartbeat requests.
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//
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// Heartbeats are sent on idle connections to ensure that the connection is
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// still healthy and to measure the RTT. If a number of heartbeats time out,
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// the connection will eventually be closed.
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class HeartbeatHandler {
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public:
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HeartbeatHandler(absl::string_view log_prefix,
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const DcSctpOptions& options,
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Context* context,
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TimerManager* timer_manager);
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// Called when the heartbeat interval timer should be restarted. This is
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// generally done every time data is sent, which makes the timer expire when
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// the connection is idle.
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void RestartTimer();
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// Called on received HeartbeatRequestChunk chunks.
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void HandleHeartbeatRequest(HeartbeatRequestChunk chunk);
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// Called on received HeartbeatRequestChunk chunks.
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void HandleHeartbeatAck(HeartbeatAckChunk chunk);
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private:
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absl::optional<DurationMs> OnIntervalTimerExpiry();
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absl::optional<DurationMs> OnTimeoutTimerExpiry();
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const std::string log_prefix_;
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Context* ctx_;
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TimerManager* timer_manager_;
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// The time for a connection to be idle before a heartbeat is sent.
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const DurationMs interval_duration_;
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// Adding RTT to the duration will add some jitter, which is good in
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// production, but less good in unit tests, which is why it can be disabled.
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const bool interval_duration_should_include_rtt_;
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const std::unique_ptr<Timer> interval_timer_;
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const std::unique_ptr<Timer> timeout_timer_;
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};
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} // namespace dcsctp
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#endif // NET_DCSCTP_SOCKET_HEARTBEAT_HANDLER_H_
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