82 lines
2.7 KiB
C#
82 lines
2.7 KiB
C#
using System;
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using System.Threading;
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using System.Threading.Tasks;
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using LeanCloud.Common;
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using LeanCloud.Realtime.Protocol;
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namespace LeanCloud.Realtime.Internal.Connection {
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/// <summary>
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/// 心跳控制器，由于 .Net Standard 2.0 不支持发送 ping frame，所以需要发送逻辑心跳
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/// 1. 每次接收到消息后开始监听，如果在 pingInterval 时间内没有再次接收到消息，则发送 ping 请求；
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/// 2. 发送后等待 pongInterval 时间，如果在此时间内接收到了任何消息，则取消并重新开始监听 1；
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/// 3. 如果没收到消息，则认为超时并回调，连接层接收回调后放弃当前连接，以断线逻辑处理
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/// </summary>
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internal class LCHeartBeat {
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private readonly LCConnection connection;
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/// <summary>
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/// ping 间隔
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/// </summary>
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private readonly int pingInterval;
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/// <summary>
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/// pong 间隔
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/// </summary>
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private readonly int pongInterval;
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private CancellationTokenSource pingCTS;
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private CancellationTokenSource pongCTS;
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internal LCHeartBeat(LCConnection connection,
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int pingInterval,
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int pongInterval) {
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this.connection = connection;
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this.pingInterval = pingInterval;
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this.pongInterval = pongInterval;
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}
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/// <summary>
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/// 更新心跳监听
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/// </summary>
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/// <returns></returns>
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internal async Task Update(Action onTimeout) {
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LCLogger.Debug("HeartBeat update");
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pingCTS?.Cancel();
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pongCTS?.Cancel();
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// 计时准备 ping
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pingCTS = new CancellationTokenSource();
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Task delayTask = Task.Delay(pingInterval, pingCTS.Token);
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await delayTask;
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if (delayTask.IsCanceled) {
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return;
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}
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// 发送 ping 包
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LCLogger.Debug("Ping ~~~");
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GenericCommand command = new GenericCommand {
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Cmd = CommandType.Echo,
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AppId = LCApplication.AppId,
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PeerId = connection.id
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};
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_ = connection.SendRequest(command);
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pongCTS = new CancellationTokenSource();
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Task timeoutTask = Task.Delay(pongInterval, pongCTS.Token);
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await timeoutTask;
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if (timeoutTask.IsCanceled) {
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return;
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}
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// timeout
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LCLogger.Error("Ping timeout");
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onTimeout.Invoke();
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}
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/// <summary>
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/// 停止心跳监听
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/// </summary>
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internal void Stop() {
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pingCTS?.Cancel();
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pongCTS?.Cancel();
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}
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}
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}
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