node.js - 如何在python子进程中使用异步等待

Question

我2021-03-16T06:52:01.205519+00:00 heroku[router]: at=error code=H12 desc="Request timeout" method=POST path="/formsubmit" host=test-searcher.herokuapp.com request_id=fc6ee612-693f-4e87-9aa6-331989fd05fd fwd="117.197.157.92" dyno=web.1 connect=0ms service=30001ms status=503 bytes=0 protocol=https 在我的节点 js 应用程序中收到此错误。为了解决这个问题，我想使用 async/await 但我无法在我的 js 代码中使用它。请帮助我。

到目前为止，我认为这是因为 heroku 的 30 秒政策 https://devcenter.heroku.com/articles/limits#http-timeouts

我的节点js代码如下

// form submit request
app.post('/formsubmit', function(req, res){

    csvData = req.files.csvfile.data.toString('utf8');
    filteredArray = cleanArray(csvData.split(/\r?\n/))
    csvData = get_array_string(filteredArray)
    // Send request to python script
    var spawn = require('child_process').spawn;
    var process = spawn('python', ["./webextraction.py", csvData, req.body.keywords, req.body.full_search])

    process.stdout.on('data', async function(data){

      var data_array = []
      data_array.push(data.toString())
      res.setHeader('Content-disposition', 'attachment; filename=output.csv');
      res.set('Content-Type', 'text/csv');
      var strin = data_array[0].trim()
      strin = strin.replace(/(\r)/gm, "");
      res.send(strin)
   

    });

});

我在heroku上收到以下错误

2021-03-16T06:51:07.059126+00:00 heroku[web.1]: Restarting
2021-03-16T06:51:07.087873+00:00 heroku[web.1]: State changed from up to starting
2021-03-16T06:51:08.797707+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2021-03-16T06:51:08.989681+00:00 heroku[web.1]: Process exited with status 143
2021-03-16T06:51:28.040420+00:00 heroku[web.1]: Starting process with command `node app.js`
2021-03-16T06:51:30.263324+00:00 app[web.1]: server running on port 3000
2021-03-16T06:51:30.478212+00:00 heroku[web.1]: State changed from starting to up
2021-03-16T06:51:38.000000+00:00 app[api]: Build succeeded
2021-03-16T06:52:01.205519+00:00 heroku[router]: at=error code=H12 desc="Request timeout" method=POST path="/formsubmit" host=test-searcher.herokuapp.com request_id=fc6ee612-693f-4e87-9aa6-331989fd05fd fwd="117.197.157.92" dyno=web.1 connect=0ms service=30001ms status=503 bytes=0 protocol=https
2021-03-16T06:53:07.169061+00:00 heroku[router]: at=info method=GET path="/" host=test-searcher.herokuapp.com request_id=db24efd1-cd75-4cb2-a00e-b72cd7160f4e fwd="117.197.157.92" dyno=web.1 connect=0ms service=17ms status=200 bytes=3208 protocol=https

我在下面尝试解决此问题

// form submit request
app.post('/formsubmit', function(req, res){

    csvData = req.files.csvfile.data.toString('utf8');
    filteredArray = cleanArray(csvData.split(/\r?\n/))
    csvData = get_array_string(filteredArray)
    // Send request to python script
    var spawn = require('child_process').spawn;
    var process = spawn('python', ["./webextraction.py", csvData, req.body.keywords, req.body.full_search])

    process.stdout.on('data', async function(data){

      var data_array = []
      
      await data_array.push(data.toString())

      res.setHeader('Content-disposition', 'attachment; filename=output.csv');
      res.set('Content-Type', 'text/csv');
      var strin = data_array[0].trim()
      strin = strin.replace(/(\r)/gm, "");
      res.send(strin)
});
});

但我仍然遇到同样的错误

Restarting
2021-03-16T07:50:07.577176+00:00 heroku[web.1]: State changed from up to starting
2021-03-16T07:50:08.520994+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2021-03-16T07:50:08.642371+00:00 heroku[web.1]: Process exited with status 143
2021-03-16T07:50:26.333143+00:00 heroku[web.1]: Starting process with command `node app.js`
2021-03-16T07:50:28.628842+00:00 app[web.1]: server running on port 3000
2021-03-16T07:50:29.106381+00:00 heroku[web.1]: State changed from starting to up
2021-03-16T07:50:44.000000+00:00 app[api]: Build succeeded
2021-03-16T07:53:02.758211+00:00 heroku[router]: at=info method=GET path="/" host=test-searcher.herokuapp.com request_id=29b18518-800e-4ec6-a3f5-7d579e056394 fwd="117.197.136.20" dyno=web.1 connect=1ms service=23ms status=200 bytes=3208 protocol=https
2021-03-16T07:53:55.638541+00:00 heroku[router]: at=error code=H12 desc="Request timeout" method=POST path="/formsubmit" host=test-searcher.herokuapp.com request_id=18a16fd9-1670-426e-a998-940ec3a16a1b fwd="117.197.136.20" dyno=web.1 connect=0ms service=30008ms status=503 bytes=0 protocol=https

标签： node.jsheroku