Question

我有一个Node.js系统，该系统将大量对象上载到MongoDB，并在保管箱中为每个对象创建文件夹。每个对象大约需要0.5秒。因此，在我有很多物体的情况下，这可能需要一分钟左右的时间。我当前要做的是使用202响应代码通知客户端对象数组已被接受。但是，我如何在一分钟后通知客户完成情况。

app.post('/BulkAdd', function (req, res) {
    issues = []
    console.log(req.body)
    res.status(202).send({response:"Processing"});
    api_functions.bulkAdd(req.body).then( (failed, issues, success) => {
        console.log('done')
    })

});


bulkAdd: async function (req, callback) {
  let failed = []
  let issues = []
  let success = []
  i = 1

  await req.reduce((promise, audit) => {
    // return promise.then(_ => dropbox_functions.createFolder(audit.scanner_ui)
    let globalData;
  return promise.then(_ => this.add(audit)
      .then((data)=> {globalData = data; return dropbox_functions.createFolder(data.ui, data)}, (error)=> {failed.push({audit: audit, error: 'There was an error adding this case to the database'}); console.log(error)})
        .then((data)=>{console.log(data, globalData);return dropbox_functions.checkScannerFolderExists(audit.scanner_ui)},(error)=>{issues.push({audit: globalData, error: 'There was an error creating the case folder in dropbox'})})
         .then((data)=>{return dropbox_functions.moveFolder(audit.scanner_ui, globalData.ui)},(error)=>{issues.push({audit: globalData, error: 'No data folder was found so an empty one was created'}); return dropbox_functions.createDataFolder(globalData.ui)})
          .then(()=>success.push({audit:globalData}), issues.push({audit: globalData, error: 'Scanner folder found but items not moved'}))
    );
  }, Promise.resolve()).catch(error => {console.log(error)});
  return(failed, issues, success)

},

Answer 1

让客户端请求等待会出现问题，是一段时间后超时还是有时显示body { background-color: lightgreen; } .ion-ios-close-circle.a { color: white; font-size: 50px; } .ion-ios-close-circle.b { background-color: white; font-size: 50px; }错误。

您可以做的是

<!DOCTYPE html>
<html>
  <head>
    <link href="https://unpkg.com/ionicons@4.4.8/dist/css/ionicons.min.css" rel="stylesheet">
  </head>

  <body>
    <div>
      <i class="a ion-ios-close-circle"></i>
      <i class="b ion-ios-close-circle"></i>
    </div>
  </body>
</html>

或者简单地实现no response received或- Make client request to server to initiate the task, and return 200OK and keep doing your task on server. - Now write a file on server after insertion of every object as status. - Read the file from client every 5-10 sec to check if server has completed creating objects or not. - Mean while your task is not completed on server, show status with completion percentage or some animation.来保持通信。

如何将长任务的完成通知HTTP客户端

1 个答案: