92 lines
3.1 KiB
C#
92 lines
3.1 KiB
C#
using Ayay.SerilogLogs;
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using Microsoft.Extensions.Hosting;
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using Serilog;
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using SHH.CameraSdk;
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using System.Diagnostics;
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namespace SHH.CameraService;
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/// <summary>
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/// 父进程守护服务 (BackgroundService)
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/// <para>核心逻辑：定期检查启动本服务的父进程是否存活，若父进程退出（如 UI 崩溃），则触发本服务自动退出，避免孤儿进程占用相机硬件资源。</para>
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/// </summary>
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public class ParentProcessSentinel : BackgroundService
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{
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private readonly ServiceConfig _config;
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private readonly IHostApplicationLifetime _lifetime;
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private ILogger _sysLog = Log.ForContext("SourceContext", LogModules.Core);
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/// <summary>
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/// 使用统一的结构化日志记录器，SourceContext 设置为 Core 模块
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/// </summary>
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public ParentProcessSentinel(
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ServiceConfig config,
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IHostApplicationLifetime lifetime)
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{
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_config = config;
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_lifetime = lifetime;
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}
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/// <summary>
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/// 执行后台守护逻辑
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/// </summary>
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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int pid = _config.ParentPid;
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// 1. 验证 PID 合法性。如果 PID 为 0 或负数，可能是手动启动调试模式，不执行守护逻辑
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if (pid <= 0)
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{
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_sysLog.Warning("[Sentinel] 未指定有效的父进程 PID ({ParentPid})，守护模式已禁用，服务将持续运行.", pid);
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return;
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}
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_sysLog.Information("[Sentinel] 父进程守护已启动，正在监控目标 PID: {ParentPid}", pid);
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while (!stoppingToken.IsCancellationRequested)
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{
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if (!IsParentRunning(pid))
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{
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_sysLog.Warning("[Sentinel] ### ALERT ### 检测到父进程 (PID:{ParentPid}) 已退出！正在下发系统终止信号...", pid);
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// 触发程序优雅退出
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_lifetime.StopApplication();
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// 强制跳出循环
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break;
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}
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// 每 2 秒检查一次，避免 CPU 浪费
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await Task.Delay(2000, stoppingToken);
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}
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}
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/// <summary>
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/// 核心状态判定：通过 PID 获取进程快照并检查存活状态
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/// </summary>
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/// <param name="pid">父进程 ID</param>
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/// <returns>存活返回 True，已消亡返回 False</returns>
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private bool IsParentRunning(int pid)
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{
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try
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{
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// 尝试获取进程对象
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var process = Process.GetProcessById(pid);
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// 检查是否已退出
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if (process.HasExited) return false;
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return true;
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}
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catch (ArgumentException)
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{
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// GetProcessById 在找不到 PID 时会抛出 ArgumentException
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// 说明进程已经不存在了
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return false;
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}
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catch (Exception ex)
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{
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_sysLog.Debug("[Sentinel] 无法定位 PID 为 {ParentPid} 的进程，判定为已退出.", pid);
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return true; // 发生未知错误时，保守起见认为它还活着
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}
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}
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} |