初始化

2026-09-15 15:44:13 +07:00
commit a23ba685e9
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+import 'dart:io';
+
+import 'package:dio/dio.dart';
+import 'package:flutter_cache_manager/flutter_cache_manager.dart';
+import 'package:hgdj/tools_base/debug_log.dart';
+import 'package:http/http.dart' hide Response;
+
+import '../../extension/extensions.dart';
+import '../../hj_utils/file_util.dart';
+import '../net/load_apk/dio_cli.dart';
+import 'cancel_token_manager.dart';
+
+/// dio 文件下载器（视频流缓存的 FileService）
+class DioFileService extends FileService {
+  /// 真正请求的 dio
+  final _dio = createDio();
+
+  @override
+  Future<FileServiceResponse> get(String url,
+      {Map<String, String>? headers = const {}}) async {
+    // cancelToken 用文件名注册、下载结束后按同一 key 移除
+    //（原来 createToken 用 name 而 remove 用 url，key 不一致：既移不掉导致泄漏，又会 firstWhere 抛 StateError）
+    final name = FileUtil.getName(url);
+    final token = CancelTokenManager().createToken(name);
+
+    // 每次请求用独立 Options：本类随 VideoCacheManager 单例，共享一份 Options 会被并发请求互相覆盖 headers
+    final options = Options(
+      method: 'GET',
+      sendTimeout: const Duration(milliseconds: 5000),
+      receiveTimeout: const Duration(milliseconds: 10000),
+      headers: {...?headers, 'cache-control': 'max-age=31104000'},
+      contentType: ContentType.binary.toString(),
+      responseType: ResponseType.stream,
+    );
+
+    Response<ResponseBody>? resp;
+    try {
+      debugLog("DioFileService get: $url");
+      resp = await _dio.get<ResponseBody>(url,
+          cancelToken: token, options: options);
+    } catch (e) {
+      debugLog("DioFileService get error: $url -> $e");
+    } finally {
+      CancelTokenManager().remove(name);
+    }
+
+    // 只认 200/206；其余（含请求异常 resp==null）直接抛：避免返回空流挂起、坏响应被缓存
+    final statusCode = resp?.statusCode ?? HttpStatus.badRequest;
+    if (resp?.data == null || (statusCode != 200 && statusCode != 206)) {
+      throw HttpException("video chunk fetch failed ($statusCode): $url");
+    }
+
+    final respHeaders = <String, String>{};
+    resp!.headers.forEach((key, values) {
+      if (values.notEmpty()) respHeaders[key] = values.first;
+    });
+    // Content-Length 可能缺失/非数字，安全解析（原 contentLengthS[0] 在空串时会 RangeError）；缺失传 null 表示长度未知
+    final contentLength =
+        int.tryParse(respHeaders[Headers.contentLengthHeader] ?? '');
+
+    debugLog(
+        "DioFileService resp($statusCode): $url contentLength:$contentLength");
+
+    return HttpGetResponse(StreamedResponse(
+      resp.data!.stream,
+      statusCode,
+      headers: respHeaders,
+      contentLength: contentLength,
+    ));
+  }
+}