[MainUI] Excessive fetching of inbox rest resource from settings/things

[seime]

The problem

After opening Settings -> Things page, the UI starts reloading the inbox resource excessively. This leads to a frozen UI and overheated CPU.

After initial load:

With a mouse click (anywhere?) it starts issuing a bunch of calls to the inbox endpoint in an endless loop.

The loading of the inbox seems to happen in batches of 100+.

Expected behavior

A single call to inbox, not hundreds (if browser window left open, thousands and a CPU fan going mad)

Steps to reproduce

1. Open Settings -> Things
2. After first load, just click on a random place on the page (that isn't a link to another view)

-> Endless loop starts.

Your environment

runtimeInfo:
  version: 4.1.1
  buildString: Release Build
locale: en-NO
systemInfo:
  configFolder: /etc/openhab
  userdataFolder: /var/lib/openhab
  logFolder: /var/log/openhab
  javaVersion: 17.0.10
  javaVendor: Debian
  osName: Linux
  osVersion: 6.1.21-v8+
  osArchitecture: aarch64
  availableProcessors: 4
  freeMemory: 1490051368
  totalMemory: 2147483648
  uptime: 85271
  startLevel: 70

clientInfo:
  device:
    ios: false
    android: false
    androidChrome: false
    desktop: true
    iphone: false
    ipod: false
    ipad: false
    edge: false
    ie: false
    firefox: false
    macos: true
    windows: false
    cordova: false
    phonegap: false
    electron: false
    nwjs: false
    webView: false
    webview: false
    standalone: false
    os: macos
    pixelRatio: 2
    prefersColorScheme: light
  isSecureContext: false
  locationbarVisible: true
  menubarVisible: true
  navigator:
    cookieEnabled: true
    deviceMemory: N/A
    hardwareConcurrency: 8
    language: en-GB
    languages:
      - en-GB
      - nb-NO
      - nb
      - en-US
      - en
      - no
      - hr
    onLine: true
    platform: MacIntel
  screen:
    width: 1792
    height: 1120
    colorDepth: 24
  support:
    touch: false
    pointerEvents: true
    observer: true
    passiveListener: true
    gestures: false
    intersectionObserver: true
  themeOptions:
    dark: light
    filled: true
    pageTransitionAnimation: default
    bars: filled
    homeNavbar: default
    homeBackground: default
    expandableCardAnimation: default
  userAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36
    (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
timestamp: 2024-02-23T07:47:13.318Z

Browser console

No information

Browser network traffic

See above

Additional information

• Problem seem to have been present at least since OH4.0, possibly before.
• Fairly large OH installation with 500+ things
• Happens (at least) in the Things overview and the Inbox page.

[seime]

Still present in 4.2.3

[digitaldan]

I do not see this on my system using chrome on a mac, so i'm not sure what might be triggering this.

500+ things

That is a lot of things, i have tons of items, but far fewer things (and i have a pretty big system), what makes up the bulk of those? How many items are in your inbox ? Anything else "unique" about your setup?

[seime]

I dug a bit further last night. My findings so far are:

• The excessive traffic is triggered by processing events from OH
• Every inbox event causes a full reload of the inbox, no matter the details of the inbox event (ie IGNORED entry)
• Some bindings create a lot of inbox events, on my system the chromecast (10 devices on my system) and deconz (50 things) sticks out at first glance
• Many events seems duplicated, I can see a handful or two of events for the same thing coming in consecutively).
• My inbox has between 100 and 200 ignored entries

There is nothing special on my system AFAIK, just not that many "dumb" electrical things left.