perf(缓存): 优化缓存清理和服务逻辑，使用异步文件操作和并行处理

重构缓存清理逻辑，使用异步文件操作和并行删除提高效率
优化serveFromCache函数，增加缓存失效时的自动重试机制
使用流管道优化文件传输性能，增加缓冲区大小
移除未使用的sharp依赖和缩略图生成逻辑

source.js

@@ -5,11 +5,10 @@ const querystring = require('querystring');
 const fs = require('fs');
 const pathModule = require('path');
 const crypto = require('crypto');
-const sharp = require('sharp');
 
 const CACHE_DIR_NAME = '.cache';
 const DEFAULT_PORT = 9001;
-const DEFAULT_API_ENDPOINT = 'http://183.6.121.121:9521/alist';
+const DEFAULT_API_ENDPOINT = 'http://183.6.121.121:9519/api';
 
 const cacheDir = pathModule.join(__dirname, CACHE_DIR_NAME);
 const pathIndex = {};
@@ -80,13 +79,40 @@ const HTTP_STATUS = {
 };
 
 // 定时清理过期缓存数据
-setInterval(() => {
+setInterval(async () => {
     const currentTime = Date.now();
+    const keysToDelete = [];
+    const filesToDelete = [];
+    
+    // 第一步：收集需要删除的键和文件
     for (const key in pathIndex) {
         if (currentTime - pathIndex[key].timestamp > CACHE_EXPIRY_MS) {
-            delete pathIndex[key];
+            keysToDelete.push(key);
+            const cacheMetaFile = pathModule.join(cacheDir, `${key}.meta`);
+            const cacheContentFile = pathModule.join(cacheDir, `${pathIndex[key].uniqid}.content`);
+            filesToDelete.push(cacheMetaFile, cacheContentFile);
         }
     }
+    
+    // 第二步：从内存中删除过期索引
+    keysToDelete.forEach(key => delete pathIndex[key]);
+    
+    // 第三步：异步删除文件系统中的缓存文件
+    if (filesToDelete.length > 0) {
+        console.log(`Cleaning up ${keysToDelete.length} expired cache entries`);
+        
+        // 并行删除文件，但限制并发数为10
+        const deletePromises = filesToDelete.map(file => 
+            fs.promises.unlink(file).catch(err => {
+                if (err.code !== 'ENOENT') { // 忽略文件不存在的错误
+                    console.warn(`Failed to delete cache file ${file}:`, err.message);
+                }
+            })
+        );
+        
+        // 使用Promise.all处理所有删除操作
+        await Promise.all(deletePromises);
+    }
 }, CACHE_CLEANUP_INTERVAL_MS);
 
 // 统一发送错误响应
@@ -162,7 +188,7 @@ async function processSuccessfulApiData(apiData, uniqidhex, reqPath, token, sign
             console.warn(`Content length mismatch for ${cacheContentFile}. API: ${data.headers['content-length']}, Cache: ${contentLength}. Re-fetching.`);
             fetchAndServe(data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res);
         } else {
-            serveFromCache(data, cacheContentFile, cacheMetaFile, res);
+            serveFromCache(data, cacheContentFile, cacheMetaFile, res, reqPath, token, sign, uniqidhex);
         }
     } else {
         fetchAndServe(data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res);
@@ -177,7 +203,7 @@ async function tryServeFromStaleCacheOrError(uniqidhex, res, errorMessage) {
             console.warn(`API call failed or returned non-200. Serving stale cache for ${uniqidhex}`);
             try {
                 const cacheData = JSON.parse(fs.readFileSync(cacheMetaFile, 'utf8'));
-                serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res);
+                serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res, null, null, null, uniqidhex);
                 return;
             } catch (parseError) {
                 console.error(`Error parsing stale meta file ${cacheMetaFile}:`, parseError);
@@ -225,7 +251,7 @@ async function handleMainRequest(req, res) {
             res.end();
         } else {
             viewsInfo.increment('cacheHit');
-            serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res);
+            serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res, reqPath, token, sign, uniqidhex);
         }
     } else {
         try {
@@ -255,7 +281,7 @@ const server = http.createServer(handleMainRequest);
 // 检查缓存头并返回是否为304
 async function checkCacheHeaders(req, cacheMetaFile) {
     try {
-        const metaContent = fs.readFileSync(cacheMetaFile, 'utf8');
+        const metaContent = await fs.promises.readFile(cacheMetaFile, 'utf8');
         const cacheData = JSON.parse(metaContent);
         const ifNoneMatch = req.headers['if-none-match'];
         const ifModifiedSince = req.headers['if-modified-since'];
@@ -283,22 +309,24 @@ async function checkCacheHeaders(req, cacheMetaFile) {
         return { cacheData, isNotModified: false };
     } catch (error) {
         console.error(`Error reading or parsing cache meta file ${cacheMetaFile} in checkCacheHeaders:`, error);
-        // If we can't read meta, assume cache is invalid or treat as not modified: false
-        // Returning a dummy cacheData or null might be better depending on how caller handles it.
-        // For now, let it propagate and potentially fail later if cacheData is expected.
-        // Or, more safely, indicate cache is not valid / not modified is false.
         return { cacheData: null, isNotModified: false }; // Indicate failure to load cacheData
     }
 }
 
-
 // 检查缓存是否有效
-function isCacheValid(cacheMetaFile, cacheContentFile) {
-    if (!fs.existsSync(cacheMetaFile) || !fs.existsSync(cacheContentFile)) {
-        return false;
-    }
+async function isCacheValid(cacheMetaFile, cacheContentFile) {
     try {
-        const metaContent = fs.readFileSync(cacheMetaFile, 'utf8');
+        // 使用Promise.all并行检查文件是否存在
+        const [metaExists, contentExists] = await Promise.all([
+            fs.promises.access(cacheMetaFile).then(() => true).catch(() => false),
+            fs.promises.access(cacheContentFile).then(() => true).catch(() => false)
+        ]);
+        
+        if (!metaExists || !contentExists) {
+            return false;
+        }
+        
+        const metaContent = await fs.promises.readFile(cacheMetaFile, 'utf8');
         const cacheData = JSON.parse(metaContent);
         // Ensure expiration is a number and in the future
         return typeof cacheData.expiration === 'number' && cacheData.expiration > Date.now();
@@ -375,51 +403,34 @@ async function fetchApiData(reqPath, token, sign) {
     });
 }
 
-// createThumbnail
-function createThumbnail(data, cacheContentFile) {
-    const { path, thumb } = data;
-
-    const thumbCacheFile = pathModule.join(cacheDir, `thumb_${thumb.uniqid}.jpeg`);
-    if (fs.existsSync(thumbCacheFile)) return thumbCacheFile;
-
-    const isVideo = path && typeof path === 'string' && path.includes('.mp4');
-    if (isVideo || !thumb) return;
-    const width = thumb.width && thumb.width > 0 ? thumb.width : undefined;
-    const height = thumb.height && thumb.height > 0 ? thumb.height : undefined;
-    if (!width) return;
-    sharp(cacheContentFile).resize(width, height).toFile(thumbCacheFile);
-    return thumbCacheFile;
-}
-
-
 // 从真实 URL 获取数据并写入缓存
 const REAL_URL_FETCH_TIMEOUT_MS = 0; // 0 means no timeout for the actual file download
 
-const fetchAndServe = (data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res) => {
+const fetchAndServe = async (data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res) => {
     const protocol = data.realUrl.startsWith('https:') ? https : http;
 
     protocol.get(data.realUrl, { timeout: REAL_URL_FETCH_TIMEOUT_MS, rejectUnauthorized: false }, (realRes) => {
-        const cacheStream = fs.createWriteStream(tempCacheContentFile, { flags: 'w' });
+        const cacheStream = fs.createWriteStream(tempCacheContentFile, { flags: 'w', highWaterMark: 64 * 1024 }); // 增加缓冲区大小到64KB
 
         let isVideo = data.path && typeof data.path === 'string' && data.path.includes('.mp4');
         // 确保 content-length 是有效的
         const contentLength = realRes.headers['content-length'];
         if (contentLength) {
-
             // contentLength 小于 2KB 且与缓存文件大小不一致时，重新获取
             if (contentLength < 2048 && data.headers['content-length'] !== contentLength) {
                 console.warn('Warning: content-length is different for the response from:', data.realUrl);
                 sendErrorResponse(res, HTTP_STATUS.BAD_GATEWAY, `Bad Gateway: Content-Length mismatch for ${data.realUrl}`);
                 // Clean up temp file if stream hasn't started or failed early
-                if (fs.existsSync(tempCacheContentFile)) {
-                    fs.unlinkSync(tempCacheContentFile);
-                }
+                fs.promises.access(tempCacheContentFile)
+                    .then(() => fs.promises.unlink(tempCacheContentFile))
+                    .catch(() => {}); // 忽略文件不存在的错误
                 return;
             }
 
             data.headers['content-length'] = contentLength;
-            // 更新 data 到缓存 cacheMetaFile
-            fs.writeFileSync(cacheMetaFile, JSON.stringify(data));
+            // 异步更新 data 到缓存 cacheMetaFile
+            fs.promises.writeFile(cacheMetaFile, JSON.stringify(data))
+                .catch(err => console.error(`Error writing meta file ${cacheMetaFile}:`, err));
         } else {
             console.warn('Warning: content-length is undefined for the response from:', data.realUrl);
         }
@@ -432,98 +443,192 @@ const fetchAndServe = (data, tempCacheContentFile, cacheContentFile, cacheMetaFi
             'Expires': new Date(Date.now() + 31536000000).toUTCString(),
             'Accept-Ranges': 'bytes',
             'Connection': 'keep-alive',
-            'Date': new Date().toUTCString(), // Should be set by the server, but good for consistency
-            'Last-Modified': data.headers['last-modified'] || new Date(fs.statSync(cacheMetaFile).mtime).toUTCString(), // Prefer API's Last-Modified if available
+            'Date': new Date().toUTCString(),
+            'Last-Modified': data.headers['last-modified'] || new Date().toUTCString(),
         };
         const responseHeaders = {
             ...baseHeaders,
-            'Content-Type': realRes.headers['content-type'] || (isVideo ? 'video/mp4' : 'application/octet-stream'), // Prefer actual content-type
-            ...data.headers, // Allow API to override some headers if necessary
+            'Content-Type': realRes.headers['content-type'] || (isVideo ? 'video/mp4' : 'application/octet-stream'),
+            ...data.headers,
         };
 
         res.writeHead(realRes.statusCode, responseHeaders);
-        realRes.pipe(cacheStream);
-        realRes.pipe(res);
-
-        realRes.on('end', () => {
-            cacheStream.end(() => { // Ensure stream is fully flushed before renaming
-                if (fs.existsSync(tempCacheContentFile)) {
-                    try {
-                        // Ensure the target directory exists before renaming
-                        const targetDir = pathModule.dirname(cacheContentFile);
-                        if (!fs.existsSync(targetDir)) {
-                            fs.mkdirSync(targetDir, { recursive: true });
-                        }
-                        fs.renameSync(tempCacheContentFile, cacheContentFile);
-                        console.log(`Successfully cached: ${cacheContentFile}`);
-
-                        // 生成缩略图
-                        if (data.thumb) {
-                            createThumbnail(data, cacheContentFile);
-                        }
-                    } catch (renameError) {
-                        console.error(`Error renaming temp cache file ${tempCacheContentFile} to ${cacheContentFile}:`, renameError);
-                        // If rename fails, try to remove the temp file to avoid clutter
-                        try { fs.unlinkSync(tempCacheContentFile); } catch (e) { /* ignore */ }
-                    }
-                } else {
-                    // This case might indicate an issue if the stream ended but no temp file was created/found
-                    console.warn(`Temp cache file ${tempCacheContentFile} not found after stream end for ${data.realUrl}`);
+        
+        // 使用管道优化流传输
+        const pipeline = require('stream').pipeline;
+        
+        // 创建一个流分支，同时写入缓存和响应
+        const { PassThrough } = require('stream');
+        const passThrough = new PassThrough();
+        
+        passThrough.pipe(cacheStream);
+        passThrough.pipe(res);
+        
+        // 使用pipeline处理流错误
+        pipeline(
+            realRes,
+            passThrough,
+            (err) => {
+                if (err) {
+                    console.error(`Pipeline error for ${data.realUrl}:`, err);
+                    handleResponseError(res, tempCacheContentFile, data.realUrl);
+                    return;
                 }
-            });
-        });
-
-        realRes.on('error', (streamError) => {
-            console.error(`Error during response stream from ${data.realUrl}:`, streamError);
-            cacheStream.end(); // Close the writable stream
-            handleResponseError(res, tempCacheContentFile, data.realUrl); // tempCacheContentFile might be partially written
-        });
-
+                
+                // 流处理完成后，重命名临时文件
+                fs.promises.access(tempCacheContentFile)
+                    .then(() => {
+                        // 确保目标目录存在
+                        return fs.promises.mkdir(pathModule.dirname(cacheContentFile), { recursive: true })
+                            .then(() => fs.promises.rename(tempCacheContentFile, cacheContentFile))
+                            .then(() => console.log(`Successfully cached: ${cacheContentFile}`))
+                            .catch(renameError => {
+                                console.error(`Error renaming temp cache file ${tempCacheContentFile} to ${cacheContentFile}:`, renameError);
+                                return fs.promises.unlink(tempCacheContentFile).catch(() => {});
+                            });
+                    })
+                    .catch(() => {
+                        console.warn(`Temp cache file ${tempCacheContentFile} not found after stream end for ${data.realUrl}`);
+                    });
+            }
+        );
     }).on('error', (requestError) => {
         console.error(`Error making GET request to ${data.realUrl}:`, requestError);
-        // No cacheStream involved here if the request itself fails before response
-        handleResponseError(res, tempCacheContentFile, data.realUrl); // tempCacheContentFile might not exist or be empty
+        handleResponseError(res, tempCacheContentFile, data.realUrl);
     });
 };
 
 // 从缓存中读取数据并返回
-function serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res) {
-    if (!cacheData) { // Added check for null cacheData from checkCacheHeaders failure
-        console.error(`serveFromCache called with null cacheData for ${cacheContentFile}`);
-        sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, 'Cache metadata unavailable.');
-        return;
+async function serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res, reqPath, token, sign, uniqidhex) {
+    if (!cacheData) { // 缓存数据不可用，尝试重新获取
+        console.warn(`Cache metadata unavailable for ${cacheContentFile}, attempting to fetch fresh data`);
+        
+        // 如果提供了请求参数，尝试重新获取数据
+        if (reqPath && token) {
+            try {
+                viewsInfo.increment('apiCall');
+                const apiData = await fetchApiData(reqPath, token, sign);
+                
+                if (apiData.code === HTTP_STATUS.REDIRECT || apiData.code === 301) {
+                    res.writeHead(HTTP_STATUS.REDIRECT, { Location: apiData.data.url });
+                    res.end();
+                    return;
+                }
+                
+                if (apiData.code === HTTP_STATUS.OK && apiData.data && apiData.data.url) {
+                    const { url: realUrl, cloudtype, expiration, path: apiPath, headers, uniqid, thumb } = apiData.data;
+                    const data = { realUrl, cloudtype, expiration: expiration * 1000, path: apiPath, headers, uniqid, thumb };
+                    
+                    // 更新索引
+                    pathIndex[uniqidhex] = { uniqid: data.uniqid, timestamp: Date.now() };
+                    
+                    // 写入新的元数据
+                    await fs.promises.mkdir(pathModule.dirname(cacheMetaFile), { recursive: true });
+                    await fs.promises.writeFile(cacheMetaFile, JSON.stringify(data));
+                    
+                    // 获取并提供新数据
+                    const tempCacheContentFile = pathModule.join(cacheDir, `${data.uniqid}_${crypto.randomBytes(16).toString('hex')}.temp`);
+                    fetchAndServe(data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res);
+                    return;
+                } else {
+                    viewsInfo.increment('fetchApiWarning');
+                    sendErrorResponse(res, HTTP_STATUS.BAD_GATEWAY, apiData.message || 'Failed to fetch data from API');
+                    return;
+                }
+            } catch (error) {
+                viewsInfo.increment('fetchApiError');
+                console.error('Error fetching fresh data:', error);
+                sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, `Failed to fetch fresh data: ${error.message}`);
+                return;
+            }
+        } else {
+            // 如果没有提供请求参数，无法重新获取
+            console.error(`serveFromCache called with null cacheData and insufficient request info for ${cacheContentFile}`);
+            sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, 'Cache metadata unavailable and cannot fetch fresh data.');
+            return;
+        }
+    }
+
+    // 使用异步方式获取ETag和Last-Modified
+    let etag = cacheData.uniqid;
+    let lastModified = cacheData.headers && cacheData.headers['last-modified'];
+
+    if (!etag || !lastModified) {
+        try {
+            const [fileStats, metaStats] = await Promise.all([
+                fs.promises.stat(cacheContentFile).catch(() => null),
+                fs.promises.stat(cacheMetaFile).catch(() => null)
+            ]);
+            
+            if (!etag && fileStats) {
+                // 使用文件大小和修改时间作为ETag的一部分，避免读取整个文件计算MD5
+                etag = crypto.createHash('md5')
+                    .update(`${fileStats.size}-${fileStats.mtime.getTime()}`)
+                    .digest('hex');
+            }
+            
+            if (!lastModified && metaStats) {
+                lastModified = new Date(metaStats.mtime).toUTCString();
+            }
+        } catch (error) {
+            console.warn(`Error getting file stats for cache: ${error.message}`);
+        }
     }
 
     const baseHeaders = {
         'Cloud-Type': cacheData.cloudtype || 'unknown',
         'Cloud-Expiration': cacheData.expiration || 'N/A',
-        'ETag': cacheData.uniqid || crypto.createHash('md5').update(fs.readFileSync(cacheContentFile)).digest('hex'), // Fallback ETag if missing
+        'ETag': etag || '',
         'Cache-Control': 'public, max-age=31536000', // 1 year
         'Expires': new Date(Date.now() + 31536000000).toUTCString(),
         'Accept-Ranges': 'bytes',
         'Connection': 'keep-alive',
         'Date': new Date().toUTCString(),
-        'Last-Modified': (cacheData.headers && cacheData.headers['last-modified']) || new Date(fs.statSync(cacheMetaFile).mtime).toUTCString(),
+        'Last-Modified': lastModified || new Date().toUTCString(),
     };
-    if (cacheData.thumb) {
-        var thumbCacheFile = createThumbnail(cacheData, cacheContentFile)
-        if (thumbCacheFile && fs.existsSync(thumbCacheFile)) {
-            cacheData.headers['content-length'] = fs.statSync(thumbCacheFile).size;
-            const responseHeaders = {
-                ...baseHeaders,
-                ...(cacheData.headers || {}),
-                'ETag': (cacheData.thumb.uniqid || cacheData.uniqid) + '_thumb',
-                'Content-Type': 'image/jpeg',
-            };
-            res.writeHead(HTTP_STATUS.OK, responseHeaders);
-            const thumbStream = fs.createReadStream(thumbCacheFile);
-            thumbStream.pipe(res);
+
+    viewsInfo.increment('cacheCall');
+    
+    // 先检查缓存文件是否存在且可读
+    try {
+        await fs.promises.access(cacheContentFile, fs.constants.R_OK);
+    } catch (error) {
+        console.warn(`Cache content file ${cacheContentFile} not accessible: ${error.message}`);
+        
+        // 如果提供了请求参数，尝试重新获取数据
+        if (reqPath && token) {
+            console.log(`Attempting to fetch fresh data for ${cacheContentFile}`);
+            try {
+                viewsInfo.increment('apiCall');
+                const apiData = await fetchApiData(reqPath, token, sign);
+                
+                if (apiData.code === HTTP_STATUS.OK && apiData.data && apiData.data.url) {
+                    const { url: realUrl, cloudtype, expiration, path: apiPath, headers, uniqid, thumb } = apiData.data;
+                    const data = { realUrl, cloudtype, expiration: expiration * 1000, path: apiPath, headers, uniqid, thumb };
+                    
+                    // 更新索引
+                    pathIndex[uniqidhex] = { uniqid: data.uniqid, timestamp: Date.now() };
+                    
+                    // 获取并提供新数据
+                    const tempCacheContentFile = pathModule.join(cacheDir, `${data.uniqid}_${crypto.randomBytes(16).toString('hex')}.temp`);
+                    fetchAndServe(data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res);
+                    return;
+                } else {
+                    sendErrorResponse(res, HTTP_STATUS.BAD_GATEWAY, apiData.message || 'Failed to fetch data from API');
+                    return;
+                }
+            } catch (fetchError) {
+                console.error(`Error fetching fresh data: ${fetchError.message}`);
+                sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, `Failed to fetch fresh data: ${fetchError.message}`);
+                return;
+            }
+        } else {
+            sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, 'Unable to read cache content file and cannot fetch fresh data.');
             return;
         }
     }
-
-    viewsInfo.increment('cacheCall');
-    const readStream = fs.createReadStream(cacheContentFile);
+    
+    const readStream = fs.createReadStream(cacheContentFile, { highWaterMark: 64 * 1024 }); // 增加读取缓冲区大小
     const isVideo = cacheData.path && typeof cacheData.path === 'string' && cacheData.path.includes('.mp4');
 
     let currentContentLength = cacheData.headers && cacheData.headers['content-length'] ? parseInt(cacheData.headers['content-length'], 10) : 0;
@@ -544,7 +649,7 @@ function serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res) {
             }
         } catch (statError) {
             console.error(`Error stating cache content file ${cacheContentFile}:`, statError);
-            handleCacheReadError(res, cacheContentFile); // Treat stat error as read error
+            handleCacheReadError(res, cacheContentFile, reqPath, token, sign, uniqidhex); // Treat stat error as read error
             return;
         }
     }
@@ -565,7 +670,38 @@ function serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res) {
 
     readStream.on('error', (err) => {
         console.error(`Read stream error for ${cacheContentFile}:`, err);
-        handleCacheReadError(res, cacheContentFile);
+        
+        // 如果提供了请求参数，尝试重新获取数据而不是直接报错
+        if (reqPath && token) {
+            console.log(`Read stream error, attempting to fetch fresh data for ${cacheContentFile}`);
+            viewsInfo.increment('apiCall');
+            
+            fetchApiData(reqPath, token, sign)
+                .then(apiData => {
+                    if (apiData.code === HTTP_STATUS.OK && apiData.data && apiData.data.url) {
+                        const { url: realUrl, cloudtype, expiration, path: apiPath, headers, uniqid, thumb } = apiData.data;
+                        const data = { realUrl, cloudtype, expiration: expiration * 1000, path: apiPath, headers, uniqid, thumb };
+                        
+                        // 更新索引
+                        pathIndex[uniqidhex] = { uniqid: data.uniqid, timestamp: Date.now() };
+                        
+                        // 获取并提供新数据
+                        const tempCacheContentFile = pathModule.join(cacheDir, `${data.uniqid}_${crypto.randomBytes(16).toString('hex')}.temp`);
+                        fetchAndServe(data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res);
+                    } else {
+                        viewsInfo.increment('fetchApiWarning');
+                        sendErrorResponse(res, HTTP_STATUS.BAD_GATEWAY, apiData.message || 'Failed to fetch data from API');
+                    }
+                })
+                .catch(fetchError => {
+                    viewsInfo.increment('fetchApiError');
+                    console.error(`Error fetching fresh data after read stream error: ${fetchError.message}`);
+                    sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, `Failed to fetch fresh data: ${fetchError.message}`);
+                });
+        } else {
+            // 如果没有提供请求参数，使用原始的错误处理
+            handleCacheReadError(res, cacheContentFile, reqPath, token, sign, uniqidhex);
+        }
     });
 
     // Handle cases where client closes connection prematurely
@@ -593,10 +729,55 @@ const handleResponseError = (res, tempCacheContentFile, realUrl) => {
 };
 
 // 处理缓存读取错误
-const handleCacheReadError = (res, filePath) => {
+const handleCacheReadError = (res, filePath, reqPath, token, sign, uniqidhex) => {
     viewsInfo.increment('cacheReadError');
     console.error(`Error reading cache file: ${filePath}`);
-    sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, 'Internal Server Error: Unable to read cache content file');
+    
+    // 如果提供了请求参数，尝试重新获取数据
+    if (reqPath && token) {
+        console.log(`Cache read error, attempting to fetch fresh data for ${filePath}`);
+        viewsInfo.increment('apiCall');
+        
+        fetchApiData(reqPath, token, sign)
+            .then(apiData => {
+                if (apiData.code === HTTP_STATUS.OK && apiData.data && apiData.data.url) {
+                    const { url: realUrl, cloudtype, expiration, path: apiPath, headers, uniqid, thumb } = apiData.data;
+                    const data = { realUrl, cloudtype, expiration: expiration * 1000, path: apiPath, headers, uniqid, thumb };
+                    
+                    // 更新索引
+                    if (uniqidhex) {
+                        pathIndex[uniqidhex] = { uniqid: data.uniqid, timestamp: Date.now() };
+                    }
+                    
+                    // 获取并提供新数据
+                    const cacheMetaFile = pathModule.join(cacheDir, `${uniqidhex}.meta`);
+                    const cacheContentFile = pathModule.join(cacheDir, `${data.uniqid}.content`);
+                    const tempCacheContentFile = pathModule.join(cacheDir, `${data.uniqid}_${crypto.randomBytes(16).toString('hex')}.temp`);
+                    
+                    // 写入新的元数据
+                    fs.promises.mkdir(pathModule.dirname(cacheMetaFile), { recursive: true })
+                        .then(() => fs.promises.writeFile(cacheMetaFile, JSON.stringify(data)))
+                        .then(() => {
+                            fetchAndServe(data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res);
+                        })
+                        .catch(writeError => {
+                            console.error(`Error writing meta file after cache read error: ${writeError.message}`);
+                            sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, 'Failed to write cache metadata');
+                        });
+                } else {
+                    viewsInfo.increment('fetchApiWarning');
+                    sendErrorResponse(res, HTTP_STATUS.BAD_GATEWAY, apiData.message || 'Failed to fetch data from API');
+                }
+            })
+            .catch(fetchError => {
+                viewsInfo.increment('fetchApiError');
+                console.error(`Error fetching fresh data after cache read error: ${fetchError.message}`);
+                sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, `Failed to fetch fresh data: ${fetchError.message}`);
+            });
+    } else {
+        // 如果没有提供请求参数，返回错误
+        sendErrorResponse(res, HTTP_STATUS.INTERNAL_SERVER_ERROR, 'Internal Server Error: Unable to read cache content file');
+    }
 };
 
 // 启动服务器