421 lines
11 KiB
JavaScript
421 lines
11 KiB
JavaScript
const fs = require('fs').promises;
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const path = require('path');
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const crypto = require('crypto');
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const axios = require('axios');
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const CacheConfigManager = require('../config/cache-config');
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/**
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* 图片缓存服务
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* 负责管理图片代理的缓存功能
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*/
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class ImageCacheService {
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constructor() {
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// 检测是否在pkg打包环境中运行
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const isPkg = process.pkg !== undefined;
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if (isPkg) {
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// 在打包环境中，使用可执行文件所在目录
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this.cacheDir = path.join(process.cwd(), 'data', 'image-cache');
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} else {
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// 在开发环境中，使用相对路径
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this.cacheDir = path.join(__dirname, '..', 'data', 'image-cache');
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}
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// 确保路径是绝对路径
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this.cacheDir = path.resolve(this.cacheDir);
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// 创建配置管理器
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this.configManager = new CacheConfigManager();
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// 默认缓存配置
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this.config = {
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maxAge: 24 * 60 * 60 * 1000, // 24小时缓存
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maxSize: 100 * 1024 * 1024, // 100MB最大缓存大小
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cleanupInterval: 60 * 60 * 1000, // 1小时清理一次
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enabled: true,
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proxy: {
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enabled: true,
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timeout: 30000,
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retryCount: 3,
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retryDelay: 1000,
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},
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allowedExtensions: ['.jpg', '.jpeg', '.png', '.gif', '.webp', '.bmp'],
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};
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// 初始化配置
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this.initializeConfig();
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}
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/**
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* 初始化配置
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*/
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async initializeConfig() {
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try {
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await this.configManager.initialize();
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const config = await this.configManager.loadConfig();
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this.config = { ...this.config, ...config };
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// 确保缓存目录存在
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await this.ensureCacheDir();
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// 启动定期清理任务
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this.startCleanupTask();
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console.log('图片缓存服务初始化完成');
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} catch (error) {
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console.error('图片缓存服务初始化失败:', error);
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}
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}
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/**
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* 确保缓存目录存在
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*/
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async ensureCacheDir() {
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try {
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await fs.mkdir(this.cacheDir, { recursive: true });
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console.log('图片缓存目录创建成功:', this.cacheDir);
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} catch (error) {
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console.error('创建图片缓存目录失败:', error);
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}
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}
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/**
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* 生成缓存文件名
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* @param {string} url 原始图片URL
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* @returns {string} 缓存文件名
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*/
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generateCacheKey(url) {
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const hash = crypto.createHash('md5').update(url).digest('hex');
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const ext = this.getFileExtension(url);
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return `${hash}${ext}`;
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}
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/**
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* 获取文件扩展名
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* @param {string} url 图片URL
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* @returns {string} 文件扩展名
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*/
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getFileExtension(url) {
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try {
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const urlObj = new URL(url);
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const pathname = urlObj.pathname;
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const ext = path.extname(pathname);
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return ext || '.jpg'; // 默认使用.jpg
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} catch (error) {
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return '.jpg';
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}
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}
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/**
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* 获取缓存文件路径
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* @param {string} url 原始图片URL
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* @returns {string} 缓存文件路径
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*/
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getCacheFilePath(url) {
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const cacheKey = this.generateCacheKey(url);
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return path.join(this.cacheDir, cacheKey);
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}
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/**
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* 检查缓存是否存在且有效
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* @param {string} url 原始图片URL
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* @returns {Promise<boolean>} 缓存是否有效
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*/
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async isCacheValid(url) {
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try {
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const cachePath = this.getCacheFilePath(url);
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const stats = await fs.stat(cachePath);
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// 检查文件是否过期
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const age = Date.now() - stats.mtime.getTime();
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return age < this.config.maxAge;
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} catch (error) {
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return false;
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}
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}
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/**
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* 从缓存获取图片
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* @param {string} url 原始图片URL
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* @returns {Promise<Buffer|null>} 图片数据，如果缓存不存在则返回null
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*/
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async getFromCache(url) {
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try {
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if (!(await this.isCacheValid(url))) {
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return null;
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}
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const cachePath = this.getCacheFilePath(url);
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const data = await fs.readFile(cachePath);
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// 更新文件访问时间
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await fs.utimes(cachePath, new Date(), new Date());
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return data;
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} catch (error) {
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console.error('读取缓存失败:', error);
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return null;
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}
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}
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/**
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* 将图片保存到缓存
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* @param {string} url 原始图片URL
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* @param {Buffer} data 图片数据
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* @returns {Promise<void>}
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*/
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async saveToCache(url, data) {
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try {
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const cachePath = this.getCacheFilePath(url);
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await fs.writeFile(cachePath, data);
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// 检查缓存大小，如果超过限制则清理
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await this.checkCacheSize();
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} catch (error) {
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console.error('保存缓存失败:', error);
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}
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}
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/**
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* 从网络下载图片并缓存
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* @param {string} url 图片URL
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* @returns {Promise<Buffer>} 图片数据
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*/
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async downloadAndCache(url) {
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let lastError;
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for (let attempt = 1; attempt <= this.config.proxy.retryCount; attempt++) {
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try {
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const response = await axios({
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method: 'GET',
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url: url,
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responseType: 'arraybuffer',
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headers: {
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'Referer': 'https://www.pixiv.net/',
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'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'
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},
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timeout: this.config.proxy.timeout
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});
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const data = Buffer.from(response.data);
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// 异步保存到缓存（不等待完成）
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if (this.config.enabled) {
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this.saveToCache(url, data).catch(error => {
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console.error('异步保存缓存失败:', error);
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});
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}
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return data;
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} catch (error) {
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lastError = error;
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if (attempt < this.config.proxy.retryCount) {
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await new Promise(resolve => setTimeout(resolve, this.config.proxy.retryDelay));
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}
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}
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}
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throw lastError;
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}
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/**
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* 获取图片（优先从缓存，缓存不存在则下载）
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* @param {string} url 图片URL
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* @returns {Promise<Buffer>} 图片数据
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*/
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async getImage(url) {
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// 检查缓存是否启用
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if (!this.config.enabled) {
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return await this.downloadAndCache(url);
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}
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// 检查文件类型是否允许缓存
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const ext = this.getFileExtension(url);
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if (!this.config.allowedExtensions.includes(ext)) {
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return await this.downloadAndCache(url);
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}
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// 首先尝试从缓存获取
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const cachedData = await this.getFromCache(url);
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if (cachedData) {
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return cachedData;
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}
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// 缓存不存在，从网络下载
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return await this.downloadAndCache(url);
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}
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/**
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* 检查缓存大小并清理
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* @returns {Promise<void>}
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*/
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async checkCacheSize() {
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try {
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const files = await fs.readdir(this.cacheDir);
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let totalSize = 0;
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const fileStats = [];
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// 计算总大小和收集文件信息
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for (const file of files) {
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const filePath = path.join(this.cacheDir, file);
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const stats = await fs.stat(filePath);
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totalSize += stats.size;
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fileStats.push({
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path: filePath,
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size: stats.size,
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mtime: stats.mtime
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});
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}
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// 如果超过最大大小，删除最旧的文件
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if (totalSize > this.config.maxSize) {
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console.log(`缓存大小 ${totalSize} 超过限制 ${this.config.maxSize}，开始清理...`);
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// 按修改时间排序，删除最旧的文件
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fileStats.sort((a, b) => a.mtime.getTime() - b.mtime.getTime());
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for (const file of fileStats) {
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await fs.unlink(file.path);
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totalSize -= file.size;
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if (totalSize <= this.config.maxSize * 0.8) { // 清理到80%
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break;
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}
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}
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console.log(`缓存清理完成，当前大小: ${totalSize}`);
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}
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} catch (error) {
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console.error('检查缓存大小失败:', error);
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}
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}
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/**
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* 清理过期缓存
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* @returns {Promise<void>}
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*/
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async cleanupExpiredCache() {
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try {
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const files = await fs.readdir(this.cacheDir);
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let cleanedCount = 0;
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for (const file of files) {
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const filePath = path.join(this.cacheDir, file);
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const stats = await fs.stat(filePath);
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const age = Date.now() - stats.mtime.getTime();
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if (age > this.config.maxAge) {
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await fs.unlink(filePath);
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cleanedCount++;
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}
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}
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if (cleanedCount > 0) {
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console.log(`清理了 ${cleanedCount} 个过期缓存文件`);
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}
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} catch (error) {
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console.error('清理过期缓存失败:', error);
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}
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}
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/**
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* 启动定期清理任务
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*/
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startCleanupTask() {
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setInterval(() => {
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this.cleanupExpiredCache().catch(error => {
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console.error('定期清理任务失败:', error);
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});
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}, this.config.cleanupInterval);
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}
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/**
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* 手动清理所有缓存
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* @returns {Promise<void>}
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*/
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async clearAllCache() {
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try {
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const files = await fs.readdir(this.cacheDir);
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for (const file of files) {
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const filePath = path.join(this.cacheDir, file);
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await fs.unlink(filePath);
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}
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console.log('所有缓存已清理');
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} catch (error) {
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console.error('清理所有缓存失败:', error);
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throw error;
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}
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}
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/**
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* 获取缓存统计信息
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* @returns {Promise<Object>} 缓存统计信息
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*/
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async getCacheStats() {
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try {
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const files = await fs.readdir(this.cacheDir);
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let totalSize = 0;
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let fileCount = 0;
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for (const file of files) {
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const filePath = path.join(this.cacheDir, file);
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const stats = await fs.stat(filePath);
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totalSize += stats.size;
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fileCount++;
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}
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return {
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fileCount,
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totalSize,
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maxSize: this.config.maxSize,
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maxAge: this.config.maxAge,
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enabled: this.config.enabled,
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config: this.config
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};
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} catch (error) {
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console.error('获取缓存统计失败:', error);
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return {
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fileCount: 0,
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totalSize: 0,
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maxSize: this.config.maxSize,
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maxAge: this.config.maxAge,
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enabled: this.config.enabled,
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config: this.config
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};
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}
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}
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/**
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* 获取缓存配置
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* @returns {Promise<Object>} 缓存配置
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*/
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async getConfig() {
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return await this.configManager.loadConfig();
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}
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/**
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* 更新缓存配置
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* @param {Object} updates 配置更新
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* @returns {Promise<Object>} 更新后的配置
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*/
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async updateConfig(updates) {
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const newConfig = await this.configManager.updateConfig(updates);
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this.config = { ...this.config, ...newConfig };
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return newConfig;
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}
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/**
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* 重置缓存配置
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* @returns {Promise<Object>} 重置后的配置
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*/
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async resetConfig() {
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const defaultConfig = await this.configManager.resetToDefault();
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this.config = { ...this.config, ...defaultConfig };
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return defaultConfig;
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}
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}
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module.exports = ImageCacheService;
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