754 lines
23 KiB
JavaScript
754 lines
23 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 CacheConfigManager = require('../config/cache-config');
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const { defaultLogger } = require('../utils/logger');
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const FileUtils = require('../utils/file-utils');
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// 创建logger实例
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const logger = defaultLogger.child('ApiCacheService');
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/**
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* API缓存服务
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* 负责管理API请求的缓存功能，特别是作者相关的API
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*/
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class ApiCacheService {
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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', 'api-cache');
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} else {
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// 在开发环境中，使用项目根目录的data文件夹
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this.cacheDir = path.join(__dirname, '..', '..', 'data', 'api-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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// 防重复删除机制 - 跟踪正在删除的文件
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this.deletingFiles = new Set();
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// 默认缓存配置
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this.config = {
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maxAge: 5 * 60 * 1000, // 5分钟缓存（API数据变化较快）
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maxSize: 50 * 1024 * 1024, // 50MB最大缓存大小
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cleanupInterval: 30 * 60 * 1000, // 30分钟清理一次
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enabled: true,
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allowedEndpoints: [
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'/v1/user/detail',
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'/v1/user/illusts',
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'/v1/user/following',
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'/v1/user/follower',
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'/v1/search/user',
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'/v1/search/illust',
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'/v1/illust/detail',
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'/v1/illust/recommended',
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'/v1/illust/ranking',
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'/v1/user/bookmarks/illust',
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'/v1/user/bookmarks/novel'
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],
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// 缓存键生成策略
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keyStrategy: {
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includeQueryParams: true, // 包含查询参数
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includeHeaders: false, // 不包含请求头
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hashAlgorithm: 'md5'
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}
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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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// logger.info('API缓存服务初始化完成');
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} catch (error) {
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logger.error('API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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// logger.info('API缓存目录创建成功:', this.cacheDir);
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} catch (error) {
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logger.error('创建API缓存目录失败:', error);
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}
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}
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/**
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* 生成缓存键
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* @param {string} method HTTP方法
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* @param {string} endpoint API端点
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* @param {Object} params 查询参数
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* @returns {string} 缓存键
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*/
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generateCacheKey(method, endpoint, params = {}) {
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// 构建缓存键的基础部分
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let keyBase = `${method.toUpperCase()}:${endpoint}`;
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// 确保params是对象
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const safeParams = params || {};
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// 如果endpoint已经包含查询参数（包含?），则解析endpoint中的参数
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if (endpoint.includes('?')) {
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// 分离endpoint和查询参数
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const [baseEndpoint, queryString] = endpoint.split('?');
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keyBase = `${method.toUpperCase()}:${baseEndpoint}`;
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// 解析查询字符串
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const urlParams = new URLSearchParams(queryString);
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const endpointParams = {};
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for (const [key, value] of urlParams) {
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endpointParams[key] = value;
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}
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// 合并endpoint中的参数和传入的params
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const allParams = { ...endpointParams, ...safeParams };
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// 如果有参数，添加到键中
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if (Object.keys(allParams).length > 0) {
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const sortedParams = Object.keys(allParams)
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.sort()
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.map(key => `${key}=${allParams[key]}`)
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.join('&');
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keyBase += `?${sortedParams}`;
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}
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} else if (this.config.keyStrategy.includeQueryParams && Object.keys(safeParams).length > 0) {
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// 如果endpoint不包含查询参数，且params不为空，则添加查询参数
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const sortedParams = Object.keys(safeParams)
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.sort()
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.map(key => `${key}=${safeParams[key]}`)
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.join('&');
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keyBase += `?${sortedParams}`;
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}
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// 使用指定的哈希算法生成最终的键
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const hash = crypto.createHash(this.config.keyStrategy.hashAlgorithm).update(keyBase).digest('hex');
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return `${hash}.json`;
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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} cacheKey 缓存键
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* @returns {string} 缓存文件路径
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*/
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getCacheFilePath(cacheKey) {
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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} cacheKey 缓存键
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* @returns {Promise<boolean>} 缓存是否有效
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*/
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async isCacheValid(cacheKey) {
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try {
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const cachePath = this.getCacheFilePath(cacheKey);
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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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* 从缓存获取数据
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* @param {string} cacheKey 缓存键
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* @returns {Promise<Object|null>} 缓存数据，如果缓存不存在则返回null
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*/
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async getFromCache(cacheKey) {
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try {
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if (!(await this.isCacheValid(cacheKey))) {
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return null;
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}
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const cachePath = this.getCacheFilePath(cacheKey);
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const data = await fs.readFile(cachePath, 'utf8');
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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 JSON.parse(data);
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} catch (error) {
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logger.error('读取API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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* 将数据保存到缓存
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* @param {string} cacheKey 缓存键
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* @param {Object} data 要缓存的数据
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* @returns {Promise<void>}
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*/
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async saveToCache(cacheKey, data) {
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try {
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const cachePath = this.getCacheFilePath(cacheKey);
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const jsonData = JSON.stringify(data, null, 2);
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await fs.writeFile(cachePath, jsonData, 'utf8');
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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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logger.error('保存API缓存失败:', error);
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}
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}
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/**
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* 检查是否应该缓存该请求
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* @param {string} method HTTP方法
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* @param {string} endpoint API端点
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* @returns {boolean} 是否应该缓存
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*/
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shouldCache(method, endpoint) {
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// 只缓存GET请求
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if (method.toUpperCase() !== 'GET') {
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return false;
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}
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// 检查端点是否在允许列表中
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return this.config.allowedEndpoints.some(allowedEndpoint =>
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endpoint.includes(allowedEndpoint)
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);
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}
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/**
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* 获取缓存数据（如果存在且有效）
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* @param {string} method HTTP方法
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* @param {string} endpoint API端点
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* @param {Object} params 查询参数
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* @returns {Promise<Object|null>} 缓存数据，如果不存在则返回null
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*/
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async get(method, endpoint, params = {}) {
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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 null;
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}
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// 检查是否应该缓存该请求
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if (!this.shouldCache(method, endpoint)) {
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return null;
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}
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// 确保params是对象
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const safeParams = params || {};
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const cacheKey = this.generateCacheKey(method, endpoint, safeParams);
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return await this.getFromCache(cacheKey);
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}
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/**
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* 设置缓存数据
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* @param {string} method HTTP方法
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* @param {string} endpoint API端点
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* @param {Object} params 查询参数
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* @param {Object} data 要缓存的数据
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* @returns {Promise<void>}
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*/
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async set(method, endpoint, params = {}, data) {
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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;
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}
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// 检查是否应该缓存该请求
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if (!this.shouldCache(method, endpoint)) {
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return;
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}
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// 确保params是对象
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const safeParams = params || {};
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const cacheKey = this.generateCacheKey(method, endpoint, safeParams);
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await this.saveToCache(cacheKey, data);
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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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// 防止重复删除同一个文件
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if (this.deletingFiles.has(filePath)) {
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continue;
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}
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try {
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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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} catch (error) {
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// 如果文件不存在，跳过
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if (error.code === 'ENOENT') {
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logger.debug(`API缓存文件不存在，跳过: ${filePath}`);
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} else {
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logger.debug(`检查API缓存文件失败: ${filePath}`, error.message);
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}
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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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logger.info(`API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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let deletedCount = 0;
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let errorCount = 0;
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for (const file of fileStats) {
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// 防止重复删除
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if (this.deletingFiles.has(file.path)) {
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continue;
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}
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// 标记文件为删除中
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this.deletingFiles.add(file.path);
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try {
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const deleteSuccess = await this.safeDeleteFileWithRetry(file.path);
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if (deleteSuccess) {
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totalSize -= file.size;
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deletedCount++;
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logger.debug(`删除过大API缓存文件: ${file.path}`);
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} else {
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errorCount++;
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logger.debug(`删除过大API缓存文件失败: ${file.path}`);
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}
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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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} finally {
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// 移除删除标记
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this.deletingFiles.delete(file.path);
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}
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}
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if (errorCount > 0) {
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logger.info(`API缓存清理完成，当前大小: ${totalSize}，成功删除 ${deletedCount} 个文件，失败 ${errorCount} 个文件`);
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} else {
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logger.info(`API缓存清理完成，当前大小: ${totalSize}，删除了 ${deletedCount} 个文件`);
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}
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}
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} catch (error) {
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logger.error('检查API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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let errorCount = 0;
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let skippedCount = 0;
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const now = Date.now();
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const errorDetails = {
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permission: 0,
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busy: 0,
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system: 0,
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other: 0
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};
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for (const file of files) {
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const filePath = path.join(this.cacheDir, file);
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// 防止重复删除同一个文件
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if (this.deletingFiles.has(filePath)) {
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logger.debug(`API缓存文件正在删除中，跳过: ${filePath}`);
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skippedCount++;
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continue;
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}
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try {
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const stats = await fs.stat(filePath);
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const age = now - stats.mtime.getTime();
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if (age > this.config.maxAge) {
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// 标记文件为删除中
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this.deletingFiles.add(filePath);
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try {
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// 使用带重试的删除方法
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const deleteSuccess = await this.safeDeleteFileWithRetry(filePath);
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if (deleteSuccess) {
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cleanedCount++;
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logger.debug(`成功删除过期API缓存文件: ${filePath}`);
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} else {
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errorCount++;
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errorDetails.other++;
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logger.debug(`删除过期API缓存文件失败: ${filePath}`);
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}
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} finally {
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// 无论成功失败，都要移除删除标记
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this.deletingFiles.delete(filePath);
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}
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}
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} catch (error) {
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// 如果文件不存在，静默忽略
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if (error.code === 'ENOENT') {
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logger.debug(`过期API缓存文件不存在，跳过: ${filePath}`);
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} else {
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const errorInfo = this.categorizeError(error);
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logger.debug(`检查过期API缓存文件失败: ${filePath}`, error.message);
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errorCount++;
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// 统计错误类型
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switch (errorInfo.type) {
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case 'permission':
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errorDetails.permission++;
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break;
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case 'busy':
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errorDetails.busy++;
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break;
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case 'system':
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errorDetails.system++;
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break;
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default:
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errorDetails.other++;
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}
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}
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// 移除删除标记
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this.deletingFiles.delete(filePath);
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}
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}
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if (cleanedCount > 0 || errorCount > 0 || skippedCount > 0) {
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if (errorCount === 0 && skippedCount === 0) {
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logger.info(`清理了 ${cleanedCount} 个过期API缓存文件`);
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} else {
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let errorMsg = `API缓存清理完成，成功删除 ${cleanedCount} 个文件，失败 ${errorCount} 个文件，跳过 ${skippedCount} 个被占用文件`;
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if (errorCount > 0) {
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const errorBreakdown = [];
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if (errorDetails.permission > 0) errorBreakdown.push(`权限错误 ${errorDetails.permission} 个`);
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if (errorDetails.busy > 0) errorBreakdown.push(`文件占用 ${errorDetails.busy} 个`);
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if (errorDetails.system > 0) errorBreakdown.push(`系统错误 ${errorDetails.system} 个`);
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if (errorDetails.other > 0) errorBreakdown.push(`其他错误 ${errorDetails.other} 个`);
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if (errorBreakdown.length > 0) {
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errorMsg += ` (${errorBreakdown.join(', ')})`;
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}
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}
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logger.info(errorMsg);
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}
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}
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} catch (error) {
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logger.error('清理过期API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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logger.error('定期清理API缓存任务失败:', 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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let deletedCount = 0;
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let failedCount = 0;
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let skippedCount = 0;
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const errorDetails = {
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permission: 0,
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busy: 0,
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system: 0,
|
|
other: 0
|
|
};
|
|
|
|
for (const file of files) {
|
|
const filePath = path.join(this.cacheDir, file);
|
|
|
|
// 防止重复删除同一个文件
|
|
if (this.deletingFiles.has(filePath)) {
|
|
logger.debug(`API缓存文件正在删除中，跳过: ${filePath}`);
|
|
skippedCount++;
|
|
continue;
|
|
}
|
|
|
|
// 标记文件为删除中
|
|
this.deletingFiles.add(filePath);
|
|
|
|
try {
|
|
// 使用带重试的删除方法
|
|
const deleteSuccess = await this.safeDeleteFileWithRetry(filePath);
|
|
if (deleteSuccess) {
|
|
deletedCount++;
|
|
logger.debug(`成功删除API缓存文件: ${filePath}`);
|
|
} else {
|
|
failedCount++;
|
|
errorDetails.other++;
|
|
logger.debug(`删除API缓存文件失败: ${filePath}`);
|
|
}
|
|
} catch (error) {
|
|
const errorInfo = this.categorizeError(error);
|
|
logger.debug(`删除API缓存文件时发生错误: ${filePath}`, error.message);
|
|
failedCount++;
|
|
|
|
// 统计错误类型
|
|
switch (errorInfo.type) {
|
|
case 'permission':
|
|
errorDetails.permission++;
|
|
break;
|
|
case 'busy':
|
|
errorDetails.busy++;
|
|
break;
|
|
case 'system':
|
|
errorDetails.system++;
|
|
break;
|
|
default:
|
|
errorDetails.other++;
|
|
}
|
|
} finally {
|
|
// 无论成功失败，都要移除删除标记
|
|
this.deletingFiles.delete(filePath);
|
|
}
|
|
}
|
|
|
|
// 清空缓存索引
|
|
this.cacheIndex.clear();
|
|
await this.saveCacheIndex();
|
|
|
|
if (deletedCount > 0 || failedCount > 0 || skippedCount > 0) {
|
|
if (failedCount === 0 && skippedCount === 0) {
|
|
logger.info(`成功清空所有API缓存，删除了 ${deletedCount} 个文件`);
|
|
} else {
|
|
let errorMsg = `API缓存清空完成，成功删除 ${deletedCount} 个文件，失败 ${failedCount} 个文件，跳过 ${skippedCount} 个被占用文件`;
|
|
|
|
if (failedCount > 0) {
|
|
const errorBreakdown = [];
|
|
if (errorDetails.permission > 0) errorBreakdown.push(`权限错误 ${errorDetails.permission} 个`);
|
|
if (errorDetails.busy > 0) errorBreakdown.push(`文件占用 ${errorDetails.busy} 个`);
|
|
if (errorDetails.system > 0) errorBreakdown.push(`系统错误 ${errorDetails.system} 个`);
|
|
if (errorDetails.other > 0) errorBreakdown.push(`其他错误 ${errorDetails.other} 个`);
|
|
|
|
if (errorBreakdown.length > 0) {
|
|
errorMsg += ` (${errorBreakdown.join(', ')})`;
|
|
}
|
|
}
|
|
|
|
logger.info(errorMsg);
|
|
}
|
|
} else {
|
|
logger.info('API缓存目录为空，无需清理');
|
|
}
|
|
} catch (error) {
|
|
logger.error('清空API缓存失败:', error);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 获取缓存统计信息
|
|
* @returns {Promise<Object>} 缓存统计信息
|
|
*/
|
|
async getCacheStats() {
|
|
try {
|
|
const files = await fs.readdir(this.cacheDir);
|
|
let totalSize = 0;
|
|
let fileCount = 0;
|
|
|
|
for (const file of files) {
|
|
const filePath = path.join(this.cacheDir, file);
|
|
try {
|
|
const stats = await fs.stat(filePath);
|
|
totalSize += stats.size;
|
|
fileCount++;
|
|
} catch (error) {
|
|
// 如果文件不存在，跳过
|
|
if (error.code === 'ENOENT') {
|
|
logger.debug(`API缓存文件不存在，跳过: ${filePath}`);
|
|
} else {
|
|
logger.debug(`检查API缓存文件失败: ${filePath}`, error.message);
|
|
}
|
|
}
|
|
}
|
|
|
|
return {
|
|
fileCount,
|
|
totalSize,
|
|
maxSize: this.config.maxSize,
|
|
maxAge: this.config.maxAge,
|
|
enabled: this.config.enabled,
|
|
allowedEndpoints: this.config.allowedEndpoints,
|
|
config: this.config
|
|
};
|
|
} catch (error) {
|
|
logger.error('获取API缓存统计失败:', error);
|
|
return {
|
|
fileCount: 0,
|
|
totalSize: 0,
|
|
maxSize: this.config.maxSize,
|
|
maxAge: this.config.maxAge,
|
|
enabled: this.config.enabled,
|
|
allowedEndpoints: this.config.allowedEndpoints,
|
|
config: this.config
|
|
};
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 获取缓存配置
|
|
* @returns {Promise<Object>} 缓存配置
|
|
*/
|
|
async getConfig() {
|
|
return await this.configManager.loadConfig();
|
|
}
|
|
|
|
/**
|
|
* 更新缓存配置
|
|
* @param {Object} updates 配置更新
|
|
* @returns {Promise<Object>} 更新后的配置
|
|
*/
|
|
async updateConfig(updates) {
|
|
const newConfig = await this.configManager.updateConfig(updates);
|
|
this.config = { ...this.config, ...newConfig };
|
|
return newConfig;
|
|
}
|
|
|
|
/**
|
|
* 重置缓存配置
|
|
* @returns {Promise<Object>} 重置后的配置
|
|
*/
|
|
async resetConfig() {
|
|
const defaultConfig = await this.configManager.resetToDefault();
|
|
this.config = { ...this.config, ...defaultConfig };
|
|
return defaultConfig;
|
|
}
|
|
|
|
/**
|
|
* 带重试的安全删除文件
|
|
* @param {string} filePath 文件路径
|
|
* @param {number} maxRetries 最大重试次数
|
|
* @returns {Promise<boolean>} 删除是否成功
|
|
*/
|
|
async safeDeleteFileWithRetry(filePath, maxRetries = 3) {
|
|
for (let attempt = 1; attempt <= maxRetries; attempt++) {
|
|
try {
|
|
const success = await FileUtils.safeDeleteFile(filePath);
|
|
if (success) {
|
|
return true;
|
|
}
|
|
|
|
// 如果删除失败但不是最后一次尝试，等待后重试
|
|
if (attempt < maxRetries) {
|
|
const delay = Math.min(1000 * attempt, 5000); // 递增延迟，最大5秒
|
|
logger.debug(`删除API缓存文件失败，${delay}ms后重试 (${attempt}/${maxRetries}): ${filePath}`);
|
|
await new Promise(resolve => setTimeout(resolve, delay));
|
|
}
|
|
} catch (error) {
|
|
logger.debug(`删除API缓存文件异常 (${attempt}/${maxRetries}): ${filePath}`, error.message);
|
|
|
|
// 如果是最后一次尝试，返回失败
|
|
if (attempt === maxRetries) {
|
|
return false;
|
|
}
|
|
|
|
// 等待后重试
|
|
const delay = Math.min(1000 * attempt, 5000);
|
|
await new Promise(resolve => setTimeout(resolve, delay));
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* 分类错误类型
|
|
* @param {Error} error 错误对象
|
|
* @returns {Object} 错误分类信息
|
|
*/
|
|
categorizeError(error) {
|
|
const errorInfo = {
|
|
type: 'unknown',
|
|
retryable: false,
|
|
message: error.message || '未知错误'
|
|
};
|
|
|
|
if (!error.code) {
|
|
return errorInfo;
|
|
}
|
|
|
|
switch (error.code) {
|
|
case 'EPERM':
|
|
case 'EACCES':
|
|
errorInfo.type = 'permission';
|
|
errorInfo.retryable = true;
|
|
break;
|
|
case 'EBUSY':
|
|
errorInfo.type = 'busy';
|
|
errorInfo.retryable = true;
|
|
break;
|
|
case 'ENOENT':
|
|
errorInfo.type = 'not_found';
|
|
errorInfo.retryable = false; // 文件不存在，不需要重试
|
|
break;
|
|
case 'EMFILE':
|
|
case 'ENFILE':
|
|
errorInfo.type = 'resource';
|
|
errorInfo.retryable = true;
|
|
break;
|
|
default:
|
|
errorInfo.type = 'system';
|
|
errorInfo.retryable = false;
|
|
}
|
|
|
|
return errorInfo;
|
|
}
|
|
}
|
|
|
|
module.exports = ApiCacheService; |