Question

我在Node JS中使用Express，并且想检查5分钟内是否没有POST请求，以便发送警报。

我们该如何解决？有人可以提出一些建议吗？

app.post('/apidata', function (request, response) {
var data = new dbData(request.body)
data.save()
  .then(_item => {
    response.send('Saved data to Database')
  })
  .catch(_err => {
    response.status(400).send('Error while saving to Database. Contact Support.')
  })
})

这是我的发帖请求。我需要检查是否正在调用此API。如果超过5分钟未致电，我需要发送警报。

Answer 1

您可以编写一个middleware用户，使其成为setTimeout的用户，如下所示：-

function alertMiddleware(req, res, next) {
    clearTimeout(req.app.locals.alertTimerID);
    req.app.locals.alertTimerID = setTimeout(() => {
        console.log('your message');
    }, 60 * 1000 * 5);
    next();
}
app.post('/apidata', alertMiddleware, (req,res,next) => {
  //Your stuff here
});

Answer 2

当然，您可以使用nodejs将发帖请求发送回您的服务器

step1: in your request method/function 

// everytime you receive request, save that time in database or in a file
//get current time in milliseconds

var timeInMss = new Date().getTime()
var fs = require('fs');
fs.writeFile("/tmp/lastrequest.txt", timeInMss , function(err) {
  if(err) {
    return console.log(err);
   }

   console.log("The request time was saved!");
});

Step2:
//setup cron job running every 5 minutes
// install node-cron using command npm install --save node-cron

var cron = require('node-cron');

cron.schedule('* * * * *', () => {
    console.log('running a task every minute');

   //first get last request time read from file  
   var fs = require('fs');

  fs.readFile("/tmp/lastrequest.txt", 'utf8', function(err, timedata) {
     //check the time in timedata data if it is more than 5 minutes   before current time, then send notification     });

   var http = require("http");

  var options = {
    host: 'youranotherserver',
  port: 80,
  path: '/serverpath',
   method: 'POST'
};

var req = http.request(options, function(res) {

  res.setEncoding('utf8');
  res.on('data', function (chunk) {

  });
});

req.on('error', function(e) {
  console.log('problem with request: ' + e.message);
   });

});

req.write('data\n');
req.write('data\n');
req.end();

我们可以检查是否从其他服务器收到POST请求调用吗？

2 个答案: