refactor: 改进后端工具类 - 增强日志功能和工具函数

backend/src/utils/logger.ts

@@ -1,9 +1,73 @@
+import * as fs from 'fs';
+import * as path from 'path';
+
 const env = process.env.DEBUG;
 const isDebug = env === "true";
 
 // 日志级别枚举
 type LogLevel = "debug" | "info" | "warn" | "error";
 
+// 日志文件路径
+const logsDir = path.join(process.cwd(), 'logs');
+let logFilePath: string | null = null;
+
+/**
+ * 获取Asia/Shanghai时区的格式化时间
+ */
+function getShanghaiTime(): Date {
+  const now = new Date();
+  const utc = now.getTime() + (now.getTimezoneOffset() * 60000);
+  const shanghaiOffset = 8;
+  return new Date(utc + (3600000 * shanghaiOffset));
+}
+
+/**
+ * 格式化时间为字符串
+ */
+function formatTimestamp(date: Date): string {
+  const year = date.getFullYear();
+  const month = String(date.getMonth() + 1).padStart(2, '0');
+  const day = String(date.getDate()).padStart(2, '0');
+  const hours = String(date.getHours()).padStart(2, '0');
+  const minutes = String(date.getMinutes()).padStart(2, '0');
+  const seconds = String(date.getSeconds()).padStart(2, '0');
+  return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
+}
+
+/**
+ * 生成日志文件名，处理同一天多次打开的情况
+ */
+function generateLogFileName(): string {
+  const now = getShanghaiTime();
+  const dateStr = now.toISOString().split('T')[0];
+  const timeStr = String(now.getHours()).padStart(2, '0') + 
+                  String(now.getMinutes()).padStart(2, '0') + 
+                  String(now.getSeconds()).padStart(2, '0');
+  return `${dateStr}_${timeStr}.log`;
+}
+
+/**
+ * 初始化日志文件
+ */
+function initLogFile() {
+  if (!fs.existsSync(logsDir)) {
+    fs.mkdirSync(logsDir, { recursive: true });
+  }
+  logFilePath = path.join(logsDir, generateLogFileName());
+}
+
+/**
+ * 写入日志到文件
+ */
+function writeToFile(logMessage: string) {
+  if (!logFilePath) {
+    initLogFile();
+  }
+  if (logFilePath) {
+    fs.appendFileSync(logFilePath, logMessage + '\n', 'utf-8');
+  }
+}
+
 /**
  * 日志记录器
  * @param level 日志级别
@@ -11,24 +75,42 @@ type LogLevel = "debug" | "info" | "warn" | "error";
  * @param data 附加数据（可选）
  */
 function log(level: LogLevel, msg: string | Error, data?: any) {
-  const timestamp = new Date().toLocaleString();
+  const shanghaiTime = getShanghaiTime();
+  const timestamp = formatTimestamp(shanghaiTime);
   const prefix = `[${level.toUpperCase()}] [${timestamp}]`;
   
   // 确保只在调试模式下输出debug日志
   if (level === "debug" && !isDebug) return;
   
+  let logMessage = '';
+  
   if (msg instanceof Error) {
-    console.error(`${prefix} ${msg.message}`);
-    console.error(msg.stack);
+    const errorMsg = `${prefix} ${msg.message}`;
+    const stackMsg = msg.stack || '';
+    const dataMsg = data ? `${prefix} Data: ${JSON.stringify(data, null, 2)}` : '';
+    
+    console.error(errorMsg);
+    console.error(stackMsg);
     if (data) console.error(`${prefix} Data:`, data);
+    
+    logMessage = errorMsg + '\n' + stackMsg;
+    if (data) logMessage += '\n' + dataMsg;
   } else {
     const logFunc = level === "error" ? console.error : 
                    level === "warn" ? console.warn : 
                    console.log;
     
-    logFunc(`${prefix} ${msg}`);
+    const outputMsg = `${prefix} ${msg}`;
+    const dataMsg = data ? `${prefix} Data: ${JSON.stringify(data, null, 2)}` : '';
+    
+    logFunc(outputMsg);
     if (data) logFunc(`${prefix} Data:`, data);
+    
+    logMessage = outputMsg;
+    if (data) logMessage += '\n' + dataMsg;
   }
+  
+  writeToFile(logMessage);
 }
 
 export const logger = {

backend/src/utils/utils.ts

@@ -193,7 +193,7 @@ export async function fastdownload(data: [string, string]|string[][]) {
 
 export async function Wfastdownload(data: string[][], ws: MessageWS) {
   logger.info(`Starting web download of ${data.length} files`);
-  
+  let index = 0;
   return await pMap(
     data,
     async (item: string[], idx: number) => {
@@ -214,7 +214,7 @@ export async function Wfastdownload(data: string[][], ws: MessageWS) {
             }
             
             // 更新下载进度
-            ws.download(data.length, idx + 1, filePath);
+            ws.download(data.length, ++index, filePath);
           },
           { retries: 3, onFailedAttempt: (error) => {
               logger.warn(`Download attempt failed for ${url}, retrying (${error.attemptNumber}/3)`);