Export to image on Ubuntu under Windows works only the first time

[cesgarma]

I am using Ubuntu running on Windows 10 using WSL1 (https://ubuntu.com/tutorials/ubuntu-on-windows#1-overview).

The first time I run kaleido write_image function to export a PNG figure it works fine.

The second and subsequent times write_image function hangs. When I interrupt with the keyboard I get the following on the terminal:
I have left it run overnight and didn't finish so it definitely hangs.

---

^CTraceback (most recent call last):
File "main.py", line 43, in
barChart.graphBarChart(cfg.emotionalGraphFilename, cfg.outputImagesFolder, xAxisLabels, yAxisValues)
File "/home/soltuin/devsource/doc-to-pdf/doc-to-pdf/barChart.py", line 81, in graphBarChart
fig.write_image(fileName, width=barWidth, height=barHeight, engine="kaleido", validate=False)
File "/home/soltuin/pythonenvironments/neocemod/lib/python3.8/site-packages/plotly/basedatatypes.py", line 3251, in write_image
return pio.write_image(self, *args, **kwargs)
File "/home/soltuin/pythonenvironments/neocemod/lib/python3.8/site-packages/plotly/io/_kaleido.py", line 244, in write_image
img_data = to_image(
File "/home/soltuin/pythonenvironments/neocemod/lib/python3.8/site-packages/plotly/io/_kaleido.py", line 130, in to_image
img_bytes = scope.transform(
File "/home/soltuin/pythonenvironments/neocemod/lib/python3.8/site-packages/kaleido/scopes/plotly.py", line 102, in transform
response = self._perform_transform(
File "/home/soltuin/pythonenvironments/neocemod/lib/python3.8/site-packages/kaleido/scopes/base.py", line 218, in _perform_transform
response = self._proc.stdout.readline()

---

I looked at the kaleido/scopes/base.py line 218 and it seems to be waiting for a response from kaleido process? (I don't know kaleido internals)

Is there anyway I can debug this issue? add verbose of some sort?

[cesgarma]

Adding data to the issue.

Running $ps just noticed that there are many kaleido processes running in the background.

PID TTY TIME CMD
287 pts/0 00:00:01 bash
537 pts/0 00:00:00 kaleido
538 pts/0 00:00:00 kaleido
573 pts/0 00:00:01 kaleido
7601 pts/0 00:00:00 kaleido
7602 pts/0 00:00:00 kaleido
7628 pts/0 00:00:01 kaleido
10061 pts/0 00:00:00 kaleido
10062 pts/0 00:00:00 kaleido
10076 pts/0 00:00:00 kaleido
10170 pts/0 00:00:00 kaleido
10171 pts/0 00:00:00 kaleido
10184 pts/0 00:00:00 kaleido
10473 pts/0 00:00:00 kaleido
10474 pts/0 00:00:00 kaleido
10487 pts/0 00:00:00 kaleido
10545 pts/0 00:00:00 kaleido
10546 pts/0 00:00:00 kaleido
10559 pts/0 00:00:00 kaleido
10565 pts/0 00:00:08 kaleido
10684 pts/0 00:00:00 kaleido
10685 pts/0 00:00:00 kaleido
10698 pts/0 00:00:00 kaleido
10699 pts/0 00:00:00 kaleido
10810 pts/0 00:00:00 kaleido
10811 pts/0 00:00:00 kaleido
10824 pts/0 00:00:00 kaleido
10825 pts/0 00:00:05 kaleido
10981 pts/0 00:00:00 kaleido
10982 pts/0 00:00:00 kaleido
10996 pts/0 00:00:00 kaleido
10997 pts/0 00:00:00 kaleido
11149 pts/0 00:00:00 kaleido
11150 pts/0 00:00:00 kaleido
11176 pts/0 00:00:01 kaleido
11294 pts/0 00:00:00 kaleido
11295 pts/0 00:00:00 kaleido
11308 pts/0 00:00:00 kaleido
11430 pts/0 00:00:00 kaleido
11431 pts/0 00:00:00 kaleido
11444 pts/0 00:00:00 kaleido
11566 pts/0 00:00:00 kaleido
11567 pts/0 00:00:00 kaleido
11580 pts/0 00:00:00 kaleido
11701 pts/0 00:00:00 kaleido
11702 pts/0 00:00:00 kaleido
11715 pts/0 00:00:00 kaleido
11991 pts/0 00:00:00 kaleido
11992 pts/0 00:00:00 kaleido
12005 pts/0 00:00:00 kaleido
12126 pts/0 00:00:00 kaleido
12127 pts/0 00:00:00 kaleido
12140 pts/0 00:00:00 kaleido
12209 pts/0 00:00:00 kaleido
12210 pts/0 00:00:00 kaleido
12223 pts/0 00:00:00 kaleido
12274 pts/0 00:00:00 kaleido
12275 pts/0 00:00:00 kaleido
12288 pts/0 00:00:00 kaleido
12289 pts/0 00:00:00 kaleido
12336 pts/0 00:00:00 kaleido
12337 pts/0 00:00:00 kaleido
12351 pts/0 00:00:00 kaleido
12408 pts/0 00:00:00 kaleido
12409 pts/0 00:00:00 kaleido
12422 pts/0 00:00:00 kaleido
12496 pts/0 00:00:00 kaleido
12497 pts/0 00:00:00 kaleido
12513 pts/0 00:00:00 kaleido
12552 pts/0 00:00:00 kaleido
12553 pts/0 00:00:00 kaleido
12567 pts/0 00:00:00 kaleido
12600 pts/0 00:00:00 kaleido
12601 pts/0 00:00:00 kaleido
12615 pts/0 00:00:00 kaleido
12660 pts/0 00:00:00 kaleido
12661 pts/0 00:00:00 kaleido
12675 pts/0 00:00:00 kaleido
12676 pts/0 00:00:05 kaleido
12721 pts/0 00:00:00 kaleido
12722 pts/0 00:00:00 kaleido
12739 pts/0 00:00:00 kaleido
12830 pts/0 00:00:00 kaleido
12831 pts/0 00:00:00 kaleido
12843 pts/0 00:00:00 kaleido
12900 pts/0 00:00:00 kaleido
12901 pts/0 00:00:00 kaleido
12914 pts/0 00:00:00 kaleido
12966 pts/0 00:00:00 kaleido
12967 pts/0 00:00:00 kaleido
12981 pts/0 00:00:00 kaleido
12983 pts/0 00:00:05 kaleido
13147 pts/0 00:00:00 kaleido
13148 pts/0 00:00:00 kaleido
13162 pts/0 00:00:00 kaleido
13189 pts/0 00:00:00 ps

[jonmmease]

Hi @cesgarma, thanks for the report.

The next thing you could try would be to call the kaleido native executable from the command line. There are some instructions for that in #26 (comment). These were written for Windows, but the approach is the same for Linux.

Since you're export is working the first time, I expect everything will work up until the first time you enter {"data":{"layout":{}}}, so do this part multiple times. It will probably hang the second time, but hopefully chromium will output some error info. Please copy all of the terminal output that you see.

All that said, it looks like folks have had trouble with using Chromium-based projects under WSL 1. See microsoft/WSL#648 and microsoft/WSL#2760. So it might not be possible to get this working reliably. I expect things will work better on WSL 2 since this is based on a true Linux VM instead of a Linux-to-windows translation layer.

[gvwilson]

Thanks for your interest in Kaleido. We are currently working on an overhaul that might address your issue - we hope to have news in a few weeks and will post an update then. Thanks - @gvwilson