OpenHab 4.3 Main UI: Developer sidebar event streaming blocks Chrome Tabs

Add-ons UIs
1

I found a strange problem in OpenHab 4.3 that blocks other tabs of Openhab to load. I can reproduce this problem every time like this:

  • Open developer sidebar in Main UI.
  • Start event streaming.
  • Wait for 10 seconds.
  • Open an additional Main UI tab in Chrome.
  • New tab load infinitely.
  • Opening the Main UI in other browser (e.g. Firefox or Edge) still works.
  • Stop event streaming on first Chrome tab.
  • Second Chrome tab loads immediateley.

I tested this with various browsers and with OpenHab 4.3 and 4.2 and I could only reproduce this problem with Chrome and Edge with OpenHab 4.3. I guess that all Chromium based browsers have this problem.

I also tested this in Firefox and could not reproduce the problem.

The Chrome task manager does not show a significantly higher cpu or memory load when the event stream is running and the developer console also does not show any problems.

Any ideas what could cause this problem?

2

There was a move to HTTP2 as well as the introduction of the log viewer using a websocket that pushes all logging events. I would guess either of these could cause some issue like this. The former is more likely to be a cause than the latter because I don’t think the log viewer is doing anything when you don’t have it open.

If not one chimes in here in a bit, open a new tab. You’ve got the steps necessary to reproduce the problem so hopefully one of the devs can reproduce and figure out what’s going on.