stream webview resources to avoid blocking a web socket

[akosyakov]

What it does

• fix loading python notebooks is slow #8358: stream webview resources to avoid blocking a web socket

How to test

• install python extension from open vsx registry
• call Create New Blank Jupyter Notebook
• UI should not be blocked, the notebook should be loaded promptly

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

[AlexTugarev]

install python extension from open vsx registry

installed, but with error

after reload it seems to be activated, at least the python selection was computed in background 👍

creating a new notebook is slow for the first time, I bet the reason is the local notebook server which is spinning up in background.

after reload, a new notebook is opened within ~5 seconds.
when trying to navigate the directories in the explorer view, it seems to be blocking for a second or so.

[AlexTugarev]

@akosyakov, how to you measure notebook should be loaded promptly?

[AlexTugarev]

BTW, Uncaught (in promise) Error: Illegal theme base! is logged a few times.

[AlexTugarev]

is this known or new?

[AlexTugarev]

UPDATE:

#8359 (comment) is probably caused by some cache issues.

Other than that, it's working, but not very fast, mainly because it takes quite some time to load the resources from the python extension. the biggest fish is "ipywidgets.js"

[AlexTugarev]

It works good. The performance really depends on the size of the resources needs to be loaded.

[akosyakov]

@akosyakov, how to you measure notebook should be loaded promptly?

Just a note I've used actually a version from MS marketplace which is much smaller than from the open vsx reigstry. That's why it is fast for me to open notebooks. The version in the open vsx registry should be fixed.

[brianking]

@akosyakov, how to you measure notebook should be loaded promptly?

Just a note I've used actually a version from MS marketplace which is much smaller than from the open vsx reigstry. That's why it is fast for me to open notebooks. The version in the open vsx registry should be fixed.

Can you file an issue at https://github.com/eclipse/open-vsx.org/issues please if necessary.

[azatsarynnyy]

I've not measured the loading time but I did not see much difference trying it.

[akosyakov]

@brianking It was fixed yesterday: EclipseFdn/publish-extensions#115

@azatsarynnyy I think you can try to install the system proxy to emulate the bad connection. It should make it very visible that before you won't be able to do any other requests to the backend while notebooks are openning.