How to deploy the setInterval loop using cloud functions?-CodePudding

I am doing the sample code

To display the history event text repeatedly, I used the function setInterval (the following code).

// The code of the web app
// My code added 
const db = admin.firestore();

const express = require('express');
const app = express();
const axios = require('axios');
const cheerio = require('cheerio');
const https = require('https');

var status;

const url = 'https://online.mmvietnam.com/trung-tam/mm-an-phu/';

const interval = setInterval(function () {
var currentdate = new Date();
var hours = currentdate.getHours()   7 ;

if (hours >= 24) {
  hours = hours - 24 ;
}

var datetime =  hours   ":"
      currentdate.getMinutes()   ":"
      currentdate.getSeconds() ;

const agent = new https.Agent({
    rejectUnauthorized: false
});
axios.get(url, { httpsAgent: agent }).then(response => {
    var html = response.data;
    const $ = cheerio.load(html)
    var menu = $('.vertical-wrapper');
    var text = menu.find('.text-title').html();

    if (text !== null) {
       status = 'OPEN';                 
    }
    else {
       status = 'CLOSED';
    }
 });
async function quickstartAddData(db) {
  // [START firestore_setup_dataset_pt1]
  const docRef = db.collection('messages').doc('mmAnPhu');
  await docRef.set({
        name: 'Thu',
        text: datetime   ' '   'Mega market An Phu'   ' '   status,
        profilePicUrl: 'CamThu', 
        timestamp: datetime 
 });    
}
quickstartAddData(db);
}, 60000);

In the code above, the infor about profilePicUrl and timestamp, I do not the exactly infor, I only use them to consistent with the other code of the web app. I only need the text: datetime ' ' 'Mega market An Phu' ' ' status.

My problem is: the web app only display the history event text about 10 times, then it stop displaying. If I want to see the next history event text, I must to enter the input messages in Message (above figure) again.

How I make the function setInterval run continually to see the history event text displaying continually on Friendly Chat?

Thank you for all your helps!

CodePudding user response：

Cloud Functions are designed to run for relatively short periods of time after a certain event happens. They cannot be used to run continuous processes. Specifically: Cloud Functions can run no longer than 9 minutes.

So that explains exactly why your interval stops after about 10 times: it has reached the maximum time that a Cloud Function can be active.

Given that you're trying to run a piece of code every minute, you can schedule a Cloud Function to run every minute. That will not only solve the functional problem, but it will also be much cheaper - and you're not paying for the (typical majority of the) time in your current execution that the code it idle.