100 lines
4.7 KiB
C#
100 lines
4.7 KiB
C#
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namespace SHH.CameraSdk;
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/// <summary>
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/// [决策引擎] 故障自愈策略 (V3.3.1 修复版)
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/// 核心职责：根据设备错误码特征，智能裁决系统应采取的恢复动作，实现故障自动化处理
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/// 关键修复（Bug R）：
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/// <para>1. 致命错误防护：对 InvalidCredentials/AccountLocked 等错误禁止重试，防止账号被锁、IP 拉黑</para>
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/// <para>2. 未知错误保守策略：对 Unknown 错误采用 ManualIntervention，避免未知风险扩散</para>
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/// 设计原则：最小化风险、最大化自愈率，区分可重试/不可重试/需人工干预的错误类型
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/// </summary>
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public static class RecoveryPolicy
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{
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#region --- 1. 核心决策逻辑：错误码→自愈动作映射 ---
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/// <summary>
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/// 根据相机错误码判定对应的故障自愈动作
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/// </summary>
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/// <param name="code">设备上报的错误码</param>
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/// <returns>标准化的自愈动作指令</returns>
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public static RecoveryAction GetAction(CameraErrorCode code)
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{
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return code switch
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{
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// ========== 场景 A: 网络类故障 (可自愈) ==========
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// 策略：指数退避重试
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// 理由：网络波动、超时、闪断为暂时性故障，延迟重试大概率恢复
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CameraErrorCode.NetworkUnreachable or
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CameraErrorCode.NetworkSendError or
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CameraErrorCode.NetworkRecvError or
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CameraErrorCode.Timeout or
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CameraErrorCode.SocketError or
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CameraErrorCode.StreamInterrupted or
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CameraErrorCode.DeviceRebooting => RecoveryAction.RetryWithBackoff,
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// ========== 场景 B: 资源繁忙类故障 (可自愈) ==========
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// 策略：指数退避重试
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// 理由：设备连接数满、缓冲区溢出，等待资源释放后可恢复
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CameraErrorCode.DeviceResourceBusy or
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CameraErrorCode.DeviceBufferOverflow or
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CameraErrorCode.DeviceBusy or
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CameraErrorCode.OperationNotFinished or
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CameraErrorCode.PortPoolExhausted or
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CameraErrorCode.MaxConnectionsReached or
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CameraErrorCode.MaxStreamExceeded => RecoveryAction.RetryWithBackoff,
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// ========== 场景 C: 致命错误 (不可自愈，禁止重试) ==========
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// 策略：立即停止
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// 理由：密码错误、账号锁定、组件缺失等故障，重试无意义且会加剧风险（账号锁死、日志爆炸）
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CameraErrorCode.InvalidCredentials or
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CameraErrorCode.AccessDenied or
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CameraErrorCode.UserNotExist or
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CameraErrorCode.AccountLocked or
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CameraErrorCode.SessionExpired or
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CameraErrorCode.InvalidChannel or
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CameraErrorCode.IpConflict or
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CameraErrorCode.SdkNotInitialized or
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CameraErrorCode.ComponentLoadFailed or
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CameraErrorCode.EncryptionLibError => RecoveryAction.FatalStop,
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// ========== 场景 D: 硬件故障 (需人工干预) ==========
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// 策略：人工介入
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// 理由：硬盘损坏、存储满等故障属于硬件层面，软件无法修复
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CameraErrorCode.HardwareFault or
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CameraErrorCode.StorageError or
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CameraErrorCode.DiskFull or
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CameraErrorCode.DiskReadOnly => RecoveryAction.ManualIntervention,
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// ========== 场景 E: 正常状态 ==========
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CameraErrorCode.Success => RecoveryAction.None,
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// ========== 场景 F: 未知错误 (关键修复 Bug R) ==========
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// 旧策略：盲目重试 → 新策略：人工干预
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// 理由：未知错误可能包含 IP 拉黑、协议不兼容等严重问题，重试会扩大风险
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_ => RecoveryAction.ManualIntervention
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};
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}
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#endregion
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#region --- 2. 辅助算法：指数退避延迟计算 ---
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/// <summary>
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/// 获取建议的指数退避延迟时间（毫秒）
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/// 算法公式：delay = min(2^n * 1000, 120000)，n = 当前重试次数
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/// 限流规则：第一次 2s → 第二次 4s → ... → 第六次 64s → 上限 120s（2分钟）
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/// </summary>
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/// <param name="retryCount">当前重试次数（从 1 开始计数）</param>
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/// <returns>延迟毫秒数</returns>
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public static int GetRetryDelay(int retryCount)
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{
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// 限制重试次数最大为 7，防止指数爆炸导致数值溢出
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int exponent = Math.Min(retryCount, 7);
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// 计算指数退避秒数
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int delaySeconds = (int)Math.Pow(2, exponent);
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// 转换为毫秒并限制上限为 2 分钟（120000ms）
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return Math.Min(delaySeconds * 1000, 120000);
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}
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#endregion
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}
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