JS heap out of memory - bwip-js

[danielferenc]

Hello there
thank you for the fantastic product you have created!

I'm using the jsreport to generate a PDF with a barcode (actually 2x barcodes but that is not relevant) and I'm experiencing an error with the heap memory.
I've seen others had similar issues already but in this case I think it may be different, maybe I'm doing something wrong.

The settings:

{
  "trustUserCode": true,
  "store": {
    "provider": "fs"
  },
  "logger": {
    "console": {
      "transport": "console",
      "level": "info"
    }
  },
  "workers": {
    "numberOfWorkers": 2
  },
  "templatingEngines": {
    "timeout": 600000,
    "strategy": "http-server"
  },
  "chrome": {
    "strategy": "chrome-pool"
  },
  "extensions": {
    "express": {
      "renderTimeout": 600000
    }
  }
}

There is only 1x template and for the test it only contains single paragraph with static text. What is causing the problem is the script (shared global, I have also tried it as the template script)

const bwipjs = require('bwip-js');

I have followed the steps here https://jsreport.net/blog/barcode-in-report#wrap to get the barcode up & running.

Using the Apache jmeter to run some load (2x users, infinite loop until error occurs) I can relatively quickly get the heap error. This is how I run the docker

 docker run -e NODE_OPTIONS=--max-old-space-size=768 -m 1024m -p 5488:5488 jsreportlocal

I use handlebars, chrome-pdf to generate the PDF.

It looks like some sort of memory leak but I do not why. Any advise would be much appreciated.

[jan_blaha]

Can you try exactly this code in helpers

const bwipjs = require('bwip-js');

function barcode()  {
  return bwipjs.toBuffer({
    bcid:  'code128',
    text:  '0123456789',
    scale:  3,
    height:  10,
    includetext:  true,
    textxalign:  'center',
  }).then(p => p.toString('base64'))
}

and this content in template

<img  src='data:image/png;base64,{{barcode}}' />

If you loop such template render, does it also OOM?
What jsreport version do you use? Can you try the latest?

[danielferenc]

Hello
I have tried it (again) with the exact method body and it failed again.

error: Error during processing request at http://localhost:5488/api/report, details: Error [WORKER_CRASHED]: Worker terminated due to reaching memory limit: JS heap out of memory
    at new NodeError (node:internal/errors:387:5)
    at Worker.[kOnExit] (node:internal/worker:285:26)
    at Worker.<computed>.onexit (node:internal/worker:202:20)

I have jsreport 3.11.3, see below.

[danielferenc]

I have tried to remove the bwip-js and used some other package (pretty much random), so I used axios, but only like this

const axios = require('axios');

The jsreport under load survived 27mins, then I got the heap error. I'm not sure this is relevant but it feels like something is not released correctly.

[jan_blaha]

It could be as you say. We are checking on it now. Will post here as soon as we have details.

[jan_blaha]

Update: This is actually really a bug. It is likely a nodejs bug that started to occur since nodejs 16.
We've implemented a workaround which we are testing now.