v1.0.1
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229
lib/services/download_task/novel_downloader.dart
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229
lib/services/download_task/novel_downloader.dart
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:dio/dio.dart';
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import 'package:extended_image/extended_image.dart';
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import 'package:flutter_dmzj/app/dialog_utils.dart';
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import 'package:flutter_dmzj/app/log.dart';
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import 'package:flutter_dmzj/models/db/novel_download_info.dart';
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import 'package:flutter_dmzj/models/db/download_status.dart';
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import 'package:flutter_dmzj/requests/novel_request.dart';
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import 'package:flutter_dmzj/services/novel_download_service.dart';
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import 'package:get/get.dart';
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// ignore: depend_on_referenced_packages
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import 'package:path/path.dart' as p;
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class NovelDownloader {
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late Rx<NovelDownloadInfo> info;
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final Function() onUpdateTask;
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NovelDownloader(NovelDownloadInfo item, {required this.onUpdateTask}) {
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info = Rx<NovelDownloadInfo>(item);
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}
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final NovelRequest request = NovelRequest();
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DownloadStatus get status => info.value.status;
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CancelToken? cancelToken;
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Dio dio = Dio(BaseOptions(
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headers: {
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'Referer': "http://www.zaimanhua.com/",
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},
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));
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void start() {
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_startDownload();
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}
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void retry() {
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_startDownload();
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}
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void pause() {
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stopTask();
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updateStatus(DownloadStatus.pause);
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}
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void cancel() async {
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var result = await DialogUtils.showAlertDialog("确定要取消此任务吗?", title: "取消任务");
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if (!result) {
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return;
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}
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cancelToken?.cancel();
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cancelToken = null;
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await _delete();
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}
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void resume() {
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_startDownload();
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}
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void stopTask() {
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cancelToken?.cancel();
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cancelToken = null;
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}
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int retryTime = 0;
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void _startDownload() async {
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updateStatus(DownloadStatus.downloading);
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retryTime = 0;
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await _downloadContent();
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int i = 0;
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for (var url in info.value.imageUrls) {
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try {
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if (status != DownloadStatus.downloading) {
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break;
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}
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retryTime = 0;
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await _downloadImage(url, i);
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i++;
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} catch (e) {
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break;
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}
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}
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if (status == DownloadStatus.downloading) {
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updateStatus(DownloadStatus.complete);
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}
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}
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Future _downloadContent() async {
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try {
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cancelToken = CancelToken();
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var content = await request.novelContent(
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volumeId: info.value.volumeID,
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chapterId: info.value.chapterId,
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cancel: cancelToken,
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cache: false,
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);
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var fileName = await _saveContent(content);
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var subStr =
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content.substring(0, content.length < 200 ? content.length : 200);
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//检查是否是插画
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if (subStr.contains(RegExp('<img.*?>'))) {
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List<String> imgs = [];
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for (var item in RegExp(r'<img.*?src=[' '""](.*?)[' '""].*?>')
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.allMatches(content)) {
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var src = item.group(1);
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if (src != null && src.isNotEmpty) {
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imgs.add(src);
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}
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}
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info.update((val) {
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val!.fileName = fileName;
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val.imageUrls = imgs;
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val.isImage = true;
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});
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} else {
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info.update((val) {
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val!.fileName = fileName;
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val.isImage = false;
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});
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}
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await _saveInfo();
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} catch (e) {
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Log.logPrint(e);
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if (e is DioException) {
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if (e.type == DioExceptionType.cancel) rethrow;
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if (status == DownloadStatus.waitNetwork ||
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status == DownloadStatus.pauseCellular) rethrow;
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if (retryTime < 3) {
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retryTime++;
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await Future.delayed(const Duration(seconds: 1));
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return await _downloadContent();
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}
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}
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updateStatus(DownloadStatus.error);
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rethrow;
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}
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}
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Future _downloadImage(String url, int index) async {
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try {
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//检查本地是否有缓存，有缓存直接复制本地的
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Uint8List bytes;
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var localFile = await getCachedImageFile(url);
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if (localFile != null) {
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bytes = await localFile.readAsBytes();
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} else {
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cancelToken = CancelToken();
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var result = await dio.get(
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url,
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options: Options(
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responseType: ResponseType.bytes,
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),
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cancelToken: cancelToken,
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);
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bytes = result.data;
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}
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var baseName = Uri.parse(url).path;
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var fileName = await _saveImage(bytes, index, p.extension(baseName));
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info.update((val) {
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val!.imageFiles.add(fileName);
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});
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await _saveInfo();
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} catch (e) {
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Log.logPrint(e);
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if (e is DioException) {
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if (e.type == DioExceptionType.cancel) rethrow;
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if (status == DownloadStatus.waitNetwork ||
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status == DownloadStatus.pauseCellular) rethrow;
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if (retryTime < 3) {
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retryTime++;
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await Future.delayed(const Duration(seconds: 1));
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return await _downloadImage(url, index);
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}
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}
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updateStatus(DownloadStatus.error);
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rethrow;
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}
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}
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Future<String> _saveContent(String content) async {
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var dir = info.value.savePath;
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var fileName = "${info.value.taskId}.txt";
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var file = File(p.join(dir, fileName));
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if (!await file.exists()) {
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file = await file.create(recursive: true);
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}
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await file.writeAsString(content);
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return fileName;
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}
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Future<String> _saveImage(
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Uint8List bytes, int index, String extension) async {
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var dir = info.value.savePath;
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var fileName = "${(index + 1).toString().padLeft(3, "0")}$extension";
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var file = File(p.join(dir, fileName));
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if (!await file.exists()) {
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file = await file.create(recursive: true);
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}
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await file.writeAsBytes(bytes);
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return fileName;
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}
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void updateStatus(DownloadStatus e, {bool updateTask = true}) async {
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info.update((val) {
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val!.status = e;
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});
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if (updateTask) {
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onUpdateTask();
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}
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await _saveInfo();
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}
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/// 保存信息
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Future _saveInfo() async {
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await NovelDownloadService.instance.box.put(info.value.taskId, info.value);
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}
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Future _delete() async {
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try {
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var dir = Directory(info.value.savePath);
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await dir.delete(recursive: true);
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} finally {
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await NovelDownloadService.instance.box.delete(info.value.taskId);
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updateStatus(DownloadStatus.cancel);
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}
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}
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}
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