二次开发源码提交
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import 'dart:convert';
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import 'dart:io';
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import 'package:cloudreve4_flutter/core/utils/app_logger.dart';
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import 'package:flutter_cache_manager/flutter_cache_manager.dart';
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import 'package:path_provider/path_provider.dart';
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import '../data/models/cache_settings_model.dart';
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import '../core/constants/storage_keys.dart';
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import 'storage_service.dart';
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/// 缓存管理器服务
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class CacheManagerService {
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static CacheManagerService? _instance;
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BaseCacheManager? _manager;
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CacheSettingsModel _settings = CacheSettingsModel();
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CacheManagerService._();
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/// 获取单例
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static CacheManagerService get instance {
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_instance ??= CacheManagerService._();
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return _instance!;
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}
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/// 初始化
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Future<void> initialize() async {
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try {
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await loadSettings();
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await _initializeManager();
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} catch (e) {
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// 忽略初始化错误，使用默认值
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AppLogger.e('CacheManagerService initialize error: $e');
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}
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}
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/// 初始化管理器
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Future<void> _initializeManager() async {
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_manager = CacheManager(
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Config(
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'cloudreve_cache',
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stalePeriod: Duration(milliseconds: _settings.cacheExpireDuration),
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maxNrOfCacheObjects: 1000,
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),
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);
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}
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/// 获取缓存管理器
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BaseCacheManager get manager {
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if (_manager == null) {
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throw Exception('CacheManagerService 未初始化，请先调用 initialize()');
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}
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return _manager!;
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}
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/// 获取缓存目录
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Future<Directory> getCacheDir() async {
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final tempDir = await getTemporaryDirectory();
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final cacheDir = Directory('${tempDir.path}/cloudreve_cache');
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if (!cacheDir.existsSync()) {
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cacheDir.createSync(recursive: true);
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}
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return cacheDir;
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}
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/// 获取当前缓存大小
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Future<int> getCacheSize() async {
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final cacheDir = await getCacheDir();
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if (!cacheDir.existsSync()) {
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return 0;
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}
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try {
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int totalSize = 0;
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final entities = cacheDir.listSync(recursive: true, followLinks: false);
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for (final entity in entities) {
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if (entity is File) {
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try {
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totalSize += entity.lengthSync();
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} catch (e) {
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// 忽略无法读取的文件
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}
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}
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}
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return totalSize;
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} catch (e) {
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return 0;
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}
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}
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/// 清空缓存
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Future<void> clearCache() async {
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final cacheDir = await getCacheDir();
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if (cacheDir.existsSync()) {
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try {
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await cacheDir.delete(recursive: true);
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} on PathAccessException {
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// Windows 文件占用，逐个删除可删除的文件
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try {
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final entities = cacheDir.listSync(recursive: true, followLinks: false);
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for (final entity in entities) {
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if (entity is File) {
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try { await entity.delete(); } catch (_) {}
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}
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}
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try { await cacheDir.delete(recursive: true); } catch (_) {}
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} catch (_) {}
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}
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}
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try {
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await _manager?.emptyCache();
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} on PathAccessException {
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// nothing to do
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}
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await _initializeManager();
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}
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/// 清理过期文件
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Future<void> cleanExpiredFiles() async {
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try {
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await manager.emptyCache();
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} catch (e) {
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// 忽略清理错误
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}
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}
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/// 加载设置
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Future<void> loadSettings() async {
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final settingsJson = await StorageService.instance.getString(
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StorageKeys.cacheSettings,
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);
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if (settingsJson != null && settingsJson.isNotEmpty) {
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try {
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final settings = CacheSettingsModel.fromJson(
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jsonDecode(settingsJson) as Map<String, dynamic>,
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);
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_settings = settings;
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} catch (e) {
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// 使用默认设置
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}
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}
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}
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/// 保存设置
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Future<void> saveSettings(CacheSettingsModel settings) async {
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_settings = settings;
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await StorageService.instance.setString(
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StorageKeys.cacheSettings,
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jsonEncode(settings.toJson()),
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);
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await _initializeManager();
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}
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/// 获取当前设置
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CacheSettingsModel get settings => _settings;
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/// 获取缓存文件信息
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Future<List<CacheFileInfo>> getCacheFiles() async {
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final cacheDir = await getCacheDir();
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final files = <CacheFileInfo>[];
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if (!cacheDir.existsSync()) {
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return files;
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}
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await for (final entity in cacheDir.list(recursive: true, followLinks: false)) {
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if (entity is File) {
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try {
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final stat = await entity.stat();
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files.add(
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CacheFileInfo(
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path: entity.path,
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name: entity.uri.pathSegments.last,
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size: stat.size,
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lastModified: stat.modified,
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),
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);
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} catch (e) {
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// 忽略无法读取的文件
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}
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}
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}
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return files;
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}
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/// 删除指定的缓存文件
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Future<void> deleteCacheFile(String path) async {
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final file = File(path);
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if (file.existsSync()) {
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try {
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await file.delete();
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} on PathAccessException {
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// Windows 文件占用，忽略
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}
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}
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}
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/// 自动清理最旧文件（当超过最大缓存大小时）
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Future<void> autoCleanOldFiles() async {
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if (!_settings.autoCleanOldFiles) {
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return;
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}
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final currentSize = await getCacheSize();
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if (currentSize <= _settings.maxCacheSize) {
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return;
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}
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final files = await getCacheFiles();
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// 按最后修改时间排序，最旧的在前
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files.sort((a, b) => a.lastModified.compareTo(b.lastModified));
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int deletedSize = 0;
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for (final file in files) {
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if (currentSize - deletedSize <= _settings.maxCacheSize) {
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break;
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}
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await deleteCacheFile(file.path);
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deletedSize += file.size;
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}
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}
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}
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/// 缓存文件信息
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class CacheFileInfo {
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final String path;
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final String name;
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final int size;
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final DateTime lastModified;
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CacheFileInfo({
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required this.path,
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required this.name,
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required this.size,
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required this.lastModified,
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});
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String get sizeReadable {
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if (size < 1024) {
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return '$size B';
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} else if (size < 1024 * 1024) {
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return '${(size / 1024).toStringAsFixed(1)} KB';
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} else if (size < 1024 * 1024 * 1024) {
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return '${(size / (1024 * 1024)).toStringAsFixed(1)} MB';
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} else {
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return '${(size / (1024 * 1024 * 1024)).toStringAsFixed(1)} GB';
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}
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}
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}
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