feat: Phase 1-3 全部完成 — 沙盒增强、学情分析、学习路径

backend/src/common/filters/global-exception.filter.ts

@@ -0,0 +1,31 @@
+import { ExceptionFilter, Catch, ArgumentsHost, HttpException, HttpStatus, Logger } from '@nestjs/common';
+import { Response } from 'express';
+
+@Catch()
+export class GlobalExceptionFilter implements ExceptionFilter {
+  private readonly logger = new Logger(GlobalExceptionFilter.name);
+
+  catch(exception: unknown, host: ArgumentsHost) {
+    const ctx = host.switchToHttp();
+    const response = ctx.getResponse<Response>();
+
+    let status = HttpStatus.INTERNAL_SERVER_ERROR;
+    let message = '服务器内部错误';
+
+    if (exception instanceof HttpException) {
+      status = exception.getStatus();
+      const res = exception.getResponse();
+      message = typeof res === 'string' ? res : (res as any).message || message;
+      if (Array.isArray(message)) message = message[0];
+    }
+
+    this.logger.error(`[${status}] ${message}`, exception instanceof Error ? exception.stack : '');
+
+    response.status(status).json({
+      code: status,
+      message,
+      data: null,
+      timestamp: new Date().toISOString(),
+    });
+  }
+}

backend/src/common/index.ts

@@ -0,0 +1,2 @@
+export { GlobalExceptionFilter } from './filters/global-exception.filter';
+export { LoggingInterceptor } from './interceptors/logging.interceptor';

backend/src/common/interceptors/logging.interceptor.ts

@@ -0,0 +1,22 @@
+import { Injectable, NestInterceptor, ExecutionContext, CallHandler, Logger } from '@nestjs/common';
+import { Observable } from 'rxjs';
+import { tap } from 'rxjs/operators';
+
+@Injectable()
+export class LoggingInterceptor implements NestInterceptor {
+  private readonly logger = new Logger('HTTP');
+
+  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+    const request = context.switchToHttp().getRequest();
+    const { method, url } = request;
+    const now = Date.now();
+
+    return next.handle().pipe(
+      tap(() => {
+        const response = context.switchToHttp().getResponse();
+        const ms = Date.now() - now;
+        this.logger.log(`${method} ${url} ${response.statusCode} ${ms}ms`);
+      }),
+    );
+  }
+}