节点js停止处理来自角度的多个api请求并在重新启动节点应用程序后工作

Posted 2023-03-07

【中文标题】节点js停止处理来自角度的多个api请求并在重新启动节点应用程序后工作

【英文标题】：node js stops working on multiple api request from angular and working after restarting the node app

【发布时间】：2021-04-01 16:09:02

【问题描述】：

我正在使用 node express js 和 angular js 开发一个应用程序。我的角度应用程序在每次路由或按钮单击时从节点 js 应用程序服务器发出 api 请求，单个组件或按钮单击也可能向节点 js 应用程序请求多个 api。在多次请求后，数据加载刚刚停止，我没有得到结果。还会获取 304 和 204 等状态码。

请查看我的 api 代码并订阅服务代码。

constroller.js ///表达js

  getList: async (req, res) => 
    try
      const result = await getList(); //from service.js (an sql query)
     
      var serviceCalls = result[0][0];
      return res.set('Content-Type': 'application/json').status(200).json(
        success: 1,
        message: 'Successfully Data Fetched',
        data: serviceCalls
      );
     catch(e)
      return res.json(
        success: 0,
        message: 'No Data Fetched' + ' ' + e.message,
        data: 
      );
    
    ,
  
  getDetails: async (req, res) => 
    try
      const id = req.query.id
      const result = await getDetails(id); //from service.js (an sql query)
      var serviceCalls = result[0][0];
      return res.set('Content-Type': 'application/json').status(200).json(
        success: 1,
        message: 'Successfully Data Fetched',
        data: serviceCalls
      );
     catch(e)
      return res.json(
        success: 0,
        message: text:'No Data Fetched ', errMsg: e.message,
        data: 
      );
    
    ,

  getTroubles: async (req, res) => 
      try
        const id = req.query.id
        const result = await getTroubles(id); //from service.js (an sql query)
        var complaintData = result[0][0];
          
        return res.set('Content-Type': 'application/json').status(200).json(
          success: 1,
          message: 'Successfully Data Fetched',
          data: complaintData
        );
       catch(e)
        return res.json(
          success: 0,
          message: 'No Data Fetched',
          data: []
        );
      
    ,

  getLogs: async (req, res) => 
        try
          const id = req.query.id
          const result = await getLogs(id); //from service.js (an sql query)
          var feedbackData = result[0][0];
          
          return res.set('Content-Type': 'application/json').status(200).json(
            success: 1,
            message: 'Successfully Data Fetched',
            data: logs
          );
         catch(e)
          return res.json(
            success: 0,
            message: text:'No Data Fetched ', errMsg: e.message,
            data: []
          );
        
    ,

routes //node js express js app.js

app.use('/serviceCall', serviceCallRoute);

服务呼叫路由

router.get("/getList", getList);
router.get("/getDetails", getDetails);
router.get("/getTroubles", getTroubles);
router.get("/getLogs", getLogs);

角度订阅 api

getServiceCalls() 
    return this.http.get(url + 'serviceCall/getList',this.httpOptions)
      .pipe(
        map((res: IServiceCall) => 
          return res;
        ),
        catchError(errorRes => 
          return throwError(errorRes);
        )
      );
  

  getServiceCallDetails(id):Observable<IServiceCall> 
    const params = new HttpParams().set('id', id);
    const headers = new HttpHeaders( 'Content-Type': 'application/json')
    return this.http.get(url + 'serviceCall/getDetails',headers:headers,params: params)
      .pipe(
        map((res: IServiceCall) => 
          return res;
        ),
        catchError(errorRes => 
          return throwError(errorRes);
        )
      );
  
  getServiceCallTroubles(id) 
    const params = new HttpParams().set('id', id);
    const headers = new HttpHeaders( 'Content-Type': 'application/json')
    return this.http.get<IServiceCallTroubles>(url + 'serviceCall/getTroubles',headers:headers,params: params)
      .pipe(
        map((res: IServiceCallTroubles) => 
          return res;
        ),
        catchError(errorRes => 
          return throwError(errorRes);
        )
      );
  
  getServiceCallLogs(id):Observable<IServiceCallLogs>
    const params = new HttpParams().set('id', id);
    const headers = new HttpHeaders( 'Content-Type': 'application/json')
    return this.http.get<IServiceCallLogs>(url + 'serviceCall/getLogs',headers:headers,params: params)
      .pipe(
        map((res: IServiceCallLogs) => 
          return res;
        ),
        catchError(errorRes => 
          return throwError(errorRes);
        )
      );
  

【参考方案1】：

express js 运行良好。数据库连接限制错误。

数据库连接限制设置为 10。因此，在 10 次 api 请求和 sql 查询之后。 db 连接断开。