feat: 添加用户任务限制检查功能

- 在 executeTemplateByCode 方法中添加用户当前任务数量限制检查，确保用户在执行新任务前不超过最大并发任务数。
- 新增 checkUserTaskLimit 方法，查询用户正在进行的任务并判断是否满足执行条件。
- 更新 Swagger API 文档，添加任务数量限制的响应示例。

src/controllers/template.controller.ts

@@ -34,7 +34,11 @@ import {
   TemplateListDto,
   BatchExecuteDto,
 } from '../dto/template.dto';
-import { TemplateExecutionEntity, ExecutionStatus, ExecutionType } from '../entities/template-execution.entity';
+import {
+  TemplateExecutionEntity,
+  ExecutionStatus,
+  ExecutionType,
+} from '../entities/template-execution.entity';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
 import { ApiCommonResponses } from '../decorators/api-common-responses.decorator';
@@ -51,7 +55,7 @@ export class TemplateController {
     private readonly templateRepository: Repository<N8nTemplateEntity>,
     @InjectRepository(TemplateExecutionEntity)
     private readonly executionRepository: Repository<TemplateExecutionEntity>,
-  ) { }
+  ) {}
 
   @Post(':templateId/execute')
   @ApiOperation({
@@ -127,10 +131,22 @@ export class TemplateController {
     description: '执行成功',
     type: TemplateExecuteResponseDto,
   })
+  @SwaggerApiResponse({
+    status: 429,
+    description: '任务数量限制',
+    schema: {
+      example: {
+        code: 429,
+        message:
+          '当前账号有3个任务正在进行中，且距开始时间不足5分钟，请稍后再试',
+        data: null,
+      },
+    },
+  })
   async executeTemplateByCode(
     @Param('code') code: string,
     @Body() body: { imageUrl: string },
-    @Request() req
+    @Request() req,
   ): Promise<ApiResponse<number>> {
     try {
       const { imageUrl } = body;
@@ -139,6 +155,11 @@ export class TemplateController {
         throw new HttpException('imageUrl is required', HttpStatus.BAD_REQUEST);
       }
 
+      const userId = req.user.userId;
+
+      // 检查用户当前的任务限制
+      await this.checkUserTaskLimit(userId);
+
       // 首先获取模板配置以确定模板类型
       const templateConfig = await this.templateFactory.getTemplateByCode(code);
       if (!templateConfig) {
@@ -150,12 +171,14 @@ export class TemplateController {
       const taskId = await template.execute(imageUrl);
 
       // 将任务保存到 TemplateExecutionEntity
-      const userId = req.user.userId;
       const execution = this.executionRepository.create({
         templateId: templateConfig.id,
         userId,
         platform: req.user.platform,
-        type: templateConfig.templateType === TemplateType.VIDEO ? ExecutionType.VIDEO : ExecutionType.IMAGE,
+        type:
+          templateConfig.templateType === TemplateType.VIDEO
+            ? ExecutionType.VIDEO
+            : ExecutionType.IMAGE,
         prompt: '', // 可以从请求参数中获取，如果有的话
         inputImageUrl: imageUrl,
         taskId: taskId, // 保存外部系统返回的任务ID，用于回调匹配
@@ -170,7 +193,7 @@ export class TemplateController {
       // 返回任务id (执行记录的ID)
       return ResponseUtil.success(savedExecution.id, '模板执行已启动');
     } catch (error) {
-      console.error(error)
+      console.error(error);
       throw new HttpException(
         error.message || 'Template execution failed',
         HttpStatus.INTERNAL_SERVER_ERROR,
@@ -178,6 +201,47 @@ export class TemplateController {
     }
   }
 
+  /**
+   * 检查用户当前任务限制
+   * @param userId 用户ID
+   * @throws HttpException 如果超出任务限制
+   */
+  private async checkUserTaskLimit(userId: string): Promise<void> {
+    // 查询用户当前进行中的任务
+    const processingTasks = await this.executionRepository.find({
+      where: {
+        userId,
+        status: ExecutionStatus.PROCESSING,
+      },
+      order: {
+        startedAt: 'ASC',
+      },
+    });
+
+    // 如果当前没有进行中的任务，允许执行
+    if (processingTasks.length === 0) {
+      return;
+    }
+
+    // 如果当前进行中任务数量已达到3个，需要检查时间限制
+    if (processingTasks.length >= 3) {
+      const now = new Date();
+      const fiveMinutesAgo = new Date(now.getTime() - 5 * 60 * 1000);
+
+      // 检查是否有任务在5分钟内开始
+      const recentTasks = processingTasks.filter(
+        (task) => task.startedAt && task.startedAt > fiveMinutesAgo,
+      );
+
+      if (recentTasks.length > 0) {
+        throw new HttpException(
+          `有${processingTasks.length}个任务正在进行中，请稍后再试`,
+          HttpStatus.TOO_MANY_REQUESTS,
+        );
+      }
+    }
+  }
+
   @Post(':templateId/batch-execute')
   @ApiOperation({
     summary: '批量执行模板',
@@ -432,7 +496,9 @@ export class TemplateController {
    * @returns 执行进度信息
    */
   @Get('execution/:taskId/progress')
-  async getExecutionProgress(@Param('taskId', ParseIntPipe) taskId: number): Promise<ApiResponse<any>> {
+  async getExecutionProgress(
+    @Param('taskId', ParseIntPipe) taskId: number,
+  ): Promise<ApiResponse<any>> {
     try {
       const execution = await this.executionRepository.findOne({
         where: { id: taskId },
@@ -446,7 +512,8 @@ export class TemplateController {
         );
       }
 
-      return ResponseUtil.success({
+      return ResponseUtil.success(
+        {
           taskId: execution.id,
           templateId: execution.templateId,
           templateName: execution.template?.name,
@@ -465,8 +532,10 @@ export class TemplateController {
           executionDuration: execution.executionDuration,
           createdAt: execution.createdAt,
           updatedAt: execution.updatedAt,
-        executionResult: execution.executionResult
+          executionResult: execution.executionResult,
-      }, '获取执行进度成功');
+        },
+        '获取执行进度成功',
+      );
     } catch (error) {
       if (error instanceof HttpException) {
         throw error;