51 lines
1.8 KiB
Dart
51 lines
1.8 KiB
Dart
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/// 断网场景注入（P3 Task 11，计划偏差登记项）。
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///
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/// 模拟器上断真实网络不便（后端就在宿主 10.0.2.2，断网=断后端不可分区
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/// 观察），按计划改为 **DIO 层故障注入**：包装 App ApiClient 的
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/// HttpClientAdapter，闸门关闭期间所有 cn-api 请求立即以 connectionError
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/// 失败——引擎 initUpload/completeUpload 走该 dio，按 NETWORK_ERROR 分类
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/// 进入 waitingNetwork 退避，恢复后重试成功，即覆盖「断网→等待网络→
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/// 恢复→续传」语义。
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///
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/// 边界（有意，登记为偏差）：presign PUT 在 Android 走原生 WorkManager
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/// 桥接（不经 dio），本注入不覆盖该腿；waitingNetwork 判定由 initUpload
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/// 失败驱动，足以驱动状态机目标分支。
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library;
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import 'dart:typed_data';
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import 'package:dio/dio.dart';
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/// 故障闸门：`offline=true` 期间所有经该 adapter 的请求立即失败。
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class FaultGate {
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bool offline = false;
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}
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/// 包装任意 [HttpClientAdapter] 的故障注入实现。
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class FaultInjectingHttpClientAdapter implements HttpClientAdapter {
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FaultInjectingHttpClientAdapter({required this.gate, required this.inner});
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final FaultGate gate;
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final HttpClientAdapter inner;
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@override
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Future<ResponseBody> fetch(
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RequestOptions options,
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Stream<Uint8List>? requestStream,
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Future<void>? cancelFuture,
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) async {
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if (gate.offline) {
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// 与真实断网同型（connectionError → AppException NETWORK_ERROR），
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// 立即抛出避免 10s 连接超时拖慢场景。
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throw DioException.connectionError(
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requestOptions: options,
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reason: 'it fault gate: offline',
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);
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}
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return inner.fetch(options, requestStream, cancelFuture);
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}
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@override
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void close({bool force = false}) => inner.close(force: force);
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}
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