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Separate thread for each user using node.js


How do I debug Node.js applications?How do I get started with Node.jsWriting files in Node.jsHow do I pass command line arguments to a Node.js program?Read environment variables in Node.jsHow to decide when to use Node.js?How to exit in Node.jsWhat is the purpose of Node.js module.exports and how do you use it?For-each over an array in JavaScript?How do I update each dependency in package.json to the latest version?






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0















I have this app that I deployed to heroku, the user id is sent with the api requests but it's just not working as I wish, on first tries it does the job and the function stop for the right user however when testing it with some hardcore settings like changing the browser, ip address, device, ect.. I got random results. The app crash, sometimes it just not clear the interval..



Not sure how to explain the issue but my goal here is to control the node server from the front-end (I am using react so also JS), the backend needs to run indefinitely, so maybe it because that heroku things sleeps, but I am getting errors even before the 30min, on the app the user can run and stop the function with a click of button, what happens is some users are connected somewhere else and not sure what actually make that bug happen.



Let me know if you wish more additional info, the code below is for the sake of simplicity, the real function take a website screenshot, upload the image for imgur and then update a firebase database, everything is async without callbacks.



const express = require('express')
const app = express()
const port = 1403

let timers = ;

app.get('/api/v1/:user/', (request, response) =>

var user = request.params.user;

if (request.query.running === 'false')
clearInterval(timers[user]);
console.log("Thread stopped for "
+ user);
else
console.log("Thread started for "
+ user);
timers[user] = setInterval(
function apiCall()
console.log("api called - thread running for "
+ user);
, 5000);

response.sendStatus(200);
)

app.listen(port, () => console.log(`App running on port $port!`))









share|improve this question
























  • "Child processes can be spawned by using our child_process.fork() API" -nodejs.org/en/about

    – Ron Royston
    Mar 27 at 1:57


















0















I have this app that I deployed to heroku, the user id is sent with the api requests but it's just not working as I wish, on first tries it does the job and the function stop for the right user however when testing it with some hardcore settings like changing the browser, ip address, device, ect.. I got random results. The app crash, sometimes it just not clear the interval..



Not sure how to explain the issue but my goal here is to control the node server from the front-end (I am using react so also JS), the backend needs to run indefinitely, so maybe it because that heroku things sleeps, but I am getting errors even before the 30min, on the app the user can run and stop the function with a click of button, what happens is some users are connected somewhere else and not sure what actually make that bug happen.



Let me know if you wish more additional info, the code below is for the sake of simplicity, the real function take a website screenshot, upload the image for imgur and then update a firebase database, everything is async without callbacks.



const express = require('express')
const app = express()
const port = 1403

let timers = ;

app.get('/api/v1/:user/', (request, response) =>

var user = request.params.user;

if (request.query.running === 'false')
clearInterval(timers[user]);
console.log("Thread stopped for "
+ user);
else
console.log("Thread started for "
+ user);
timers[user] = setInterval(
function apiCall()
console.log("api called - thread running for "
+ user);
, 5000);

response.sendStatus(200);
)

app.listen(port, () => console.log(`App running on port $port!`))









share|improve this question
























  • "Child processes can be spawned by using our child_process.fork() API" -nodejs.org/en/about

    – Ron Royston
    Mar 27 at 1:57














0












0








0








I have this app that I deployed to heroku, the user id is sent with the api requests but it's just not working as I wish, on first tries it does the job and the function stop for the right user however when testing it with some hardcore settings like changing the browser, ip address, device, ect.. I got random results. The app crash, sometimes it just not clear the interval..



Not sure how to explain the issue but my goal here is to control the node server from the front-end (I am using react so also JS), the backend needs to run indefinitely, so maybe it because that heroku things sleeps, but I am getting errors even before the 30min, on the app the user can run and stop the function with a click of button, what happens is some users are connected somewhere else and not sure what actually make that bug happen.



Let me know if you wish more additional info, the code below is for the sake of simplicity, the real function take a website screenshot, upload the image for imgur and then update a firebase database, everything is async without callbacks.



const express = require('express')
const app = express()
const port = 1403

let timers = ;

app.get('/api/v1/:user/', (request, response) =>

var user = request.params.user;

if (request.query.running === 'false')
clearInterval(timers[user]);
console.log("Thread stopped for "
+ user);
else
console.log("Thread started for "
+ user);
timers[user] = setInterval(
function apiCall()
console.log("api called - thread running for "
+ user);
, 5000);

response.sendStatus(200);
)

app.listen(port, () => console.log(`App running on port $port!`))









share|improve this question














I have this app that I deployed to heroku, the user id is sent with the api requests but it's just not working as I wish, on first tries it does the job and the function stop for the right user however when testing it with some hardcore settings like changing the browser, ip address, device, ect.. I got random results. The app crash, sometimes it just not clear the interval..



Not sure how to explain the issue but my goal here is to control the node server from the front-end (I am using react so also JS), the backend needs to run indefinitely, so maybe it because that heroku things sleeps, but I am getting errors even before the 30min, on the app the user can run and stop the function with a click of button, what happens is some users are connected somewhere else and not sure what actually make that bug happen.



Let me know if you wish more additional info, the code below is for the sake of simplicity, the real function take a website screenshot, upload the image for imgur and then update a firebase database, everything is async without callbacks.



const express = require('express')
const app = express()
const port = 1403

let timers = ;

app.get('/api/v1/:user/', (request, response) =>

var user = request.params.user;

if (request.query.running === 'false')
clearInterval(timers[user]);
console.log("Thread stopped for "
+ user);
else
console.log("Thread started for "
+ user);
timers[user] = setInterval(
function apiCall()
console.log("api called - thread running for "
+ user);
, 5000);

response.sendStatus(200);
)

app.listen(port, () => console.log(`App running on port $port!`))






javascript node.js






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 27 at 1:21







user7319004






















  • "Child processes can be spawned by using our child_process.fork() API" -nodejs.org/en/about

    – Ron Royston
    Mar 27 at 1:57


















  • "Child processes can be spawned by using our child_process.fork() API" -nodejs.org/en/about

    – Ron Royston
    Mar 27 at 1:57

















"Child processes can be spawned by using our child_process.fork() API" -nodejs.org/en/about

– Ron Royston
Mar 27 at 1:57






"Child processes can be spawned by using our child_process.fork() API" -nodejs.org/en/about

– Ron Royston
Mar 27 at 1:57













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