Server crashes when trying to display any telemetry source from "Example Spacecraft"

[jannismain]

Whenever I try to click on any telemetry source for the Example Spacecraft, the server crashes with the following output:

$ npm start

> openmct-tutorials@0.0.1 start /Users/mkj/Developer/fobp-openmct/ext/openmct-tutorial
> node example-server/server.js

Example spacecraft launched!
Press Enter to toggle thruster state.
Open MCT hosted at http://localhost:8080
History hosted at http://localhost:8080/history
Realtime hosted at ws://localhost:8080/realtime
events.js:291
      throw er; // Unhandled 'error' event
      ^

RangeError: Invalid WebSocket frame: RSV1 must be clear
    at Receiver.getInfo (./openmct-tutorial/node_modules/express-ws/node_modules/ws/lib/receiver.js:167:14)
    at Receiver.startLoop (./openmct-tutorial/node_modules/express-ws/node_modules/ws/lib/receiver.js:121:22)
    at Receiver._write (./openmct-tutorial/node_modules/express-ws/node_modules/ws/lib/receiver.js:69:10)
    at doWrite (_stream_writable.js:403:12)
    at writeOrBuffer (_stream_writable.js:387:5)
    at Receiver.Writable.write (_stream_writable.js:318:11)
    at Socket.socketOnData (./openmct-tutorial/node_modules/express-ws/node_modules/ws/lib/websocket.js:795:35)
    at Socket.emit (events.js:314:20)
    at addChunk (_stream_readable.js:297:12)
    at readableAddChunk (_stream_readable.js:272:9)
Emitted 'error' event on WebSocket instance at:
    at Receiver.receiverOnError (./openmct-tutorial/node_modules/express-ws/node_modules/ws/lib/websocket.js:700:13)
    at Receiver.emit (events.js:314:20)
    at errorOrDestroy (internal/streams/destroy.js:108:12)
    at onwriteError (_stream_writable.js:418:5)
    at onwrite (_stream_writable.js:445:5)
    at Receiver.startLoop (./openmct-tutorial/node_modules/express-ws/node_modules/ws/lib/receiver.js:141:5)
    at Receiver._write (./openmct-tutorial/node_modules/express-ws/node_modules/ws/lib/receiver.js:69:10)
    [... lines matching original stack trace ...]
    at Receiver.Writable.write (_stream_writable.js:318:11) {
  [Symbol(status-code)]: 1002
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! openmct-tutorials@0.0.1 start: `node example-server/server.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the openmct-tutorials@0.0.1 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     ./.npm/_logs/2021-10-20T17_07_17_454Z-debug.log

The issue seems related to the express-ws module. Anything I could have done differently to cause this? I know that the tutorial used to work for me in the past...

I have already tried the following

• use different node version (v14, v12)
• clean clone and fresh install

I have attached my package-lock.json in case it is related to some rogue dependency that might need to be pinned (zipped because GitHub won't allow uploading json files).

package-lock.json.zip

/edit: updated package-lock.json file

[akhenry]

Thanks for reporting, and for the package-lock! That will help a lot.

This is new behavior, and it's not anything you've done.

Could you tell us which version of Chrome you're using?

[akhenry]

@jannismain I am noticing that express-ws does not appear in your package-lock.json. My package-lock.json shows express-ws version 4.0.0. Not quite sure what this means yet, but is it possible you have express-ws installed globally? Or did you remove the express-ws dependency from your package.json before you ran npm install?

[jannismain]

I have tried it with the following Browsers:

• Brave: Version 1.30.89 Chromium: 94.0.4606.81 (Official Build) (x86_64)
• Chromium: Version 89.0.4389.0 (Developer Build) (x86_64)
• Firefox: 93.0 (64-bit)

The browser console at time of the crash shows the following:

XHR GEThttp://localhost:8080/history/prop.fuel?start=1634803885565&end=1634804785565
Uncaught TypeError: req.getResponseHeader(...) is null
    generateResponse http://localhost:8080/lib/http.js:21
    onreadystatechange http://localhost:8080/lib/http.js:36
    promise http://localhost:8080/lib/http.js:33
    xhr http://localhost:8080/lib/http.js:28
    get http://localhost:8080/lib/http.js:50
    request http://localhost:8080/historical-telemetry-plugin.js:17
    request http://localhost:8080/node_modules/openmct/dist/openmct.js:335
    fetch http://localhost:8080/node_modules/openmct/dist/openmct.js:346
    load http://localhost:8080/node_modules/openmct/dist/openmct.js:346
    loadSeriesData http://localhost:8080/node_modules/openmct/dist/openmct.js:346
    n http://localhost:8080/node_modules/openmct/dist/openmct.js:17
    handleWindowResize http://localhost:8080/node_modules/openmct/dist/openmct.js:346
    n http://localhost:8080/node_modules/openmct/dist/openmct.js:17
    p http://localhost:8080/node_modules/openmct/dist/openmct.js:11
    y http://localhost:8080/node_modules/openmct/dist/openmct.js:11
    g http://localhost:8080/node_modules/openmct/dist/openmct.js:11
http.js:21:13

[jannismain]

Regarding the package-lock.json I might have given you the wrong one (from openmct instead of openmct-tutorial). Sorry about that.

Here is the correct one: package-lock.json.zip