Error on empty nightscout instance (glooko)

[burnedikt]

The following code throws an error if running the connect plugin with glooko credentials on an empty nightscout instance, I assume because there is no last_known yet.

/opt/app/node_modules/nightscout-connect/lib/sources/glooko/index.js:85
      var last_mills = Math.max(two_days_ago, last_known.entries ? last_known.entries.getTime( ) : two_days_ago);
                                                         ^
TypeError: Cannot read properties of null (reading 'entries')
    at Object.dataFromSesssion (/opt/app/node_modules/nightscout-connect/lib/sources/glooko/index.js:85:58)
    at dataFetchService (/opt/app/node_modules/nightscout-connect/lib/machines/fetch.js:8:19)
    at Interpreter._exec (/opt/app/node_modules/xstate/lib/interpreter.js:269:63)
    at Interpreter.exec (/opt/app/node_modules/xstate/lib/interpreter.js:1026:10)
    at Interpreter.execute (/opt/app/node_modules/xstate/lib/interpreter.js:387:14)
    at Interpreter.update (/opt/app/node_modules/xstate/lib/interpreter.js:415:12)
    at /opt/app/node_modules/xstate/lib/interpreter.js:110:15
    at Scheduler.process (/opt/app/node_modules/xstate/lib/scheduler.js:69:7)
    at Scheduler.schedule (/opt/app/node_modules/xstate/lib/scheduler.js:48:10)
    at Interpreter.send (/opt/app/node_modules/xstate/lib/interpreter.js:104:23)

https://github.com/nightscout/nightscout-connect/blob/8f2ab374a288f8541b916d92cecfb55bb5f44889/lib/sources/glooko/index.js#L85C22-L85C22

[burnedikt]

Actually, I also get this issue when there are entries on nightscout already. I'm having a hard time to pin this down due to the "machines" architecture, but I guess this means the DetermineGaps step doesn't determine any gap.

Solution is probably just a different check à la

- var last_mills = Math.max(two_days_ago, last_known.entries ? last_known.entries.getTime( ) : two_days_ago);
+ var last_mills = Math.max(two_days_ago, last_known && last_known.entries ? last_known.entries.getTime( ) : two_days_ago);

But it seems odd that last_known stays null since it should always return something here? https://github.com/nightscout/nightscout-connect/blob/8f2ab374a288f8541b916d92cecfb55bb5f44889/lib/machines/fetch.js#L25.

Logs leading up until the NPE btw:

nightscout  | GAP FOR
nightscout  | WAITING FOR data-processed
nightscout  | ALARM SOCKET: emitted clear_alarm to all clients
nightscout  | tick 2023-07-11T08:33:01.117Z
nightscout  | DEBUG nightscout-connect {
nightscout  |   now: 2023-07-11T08:33:01.117Z,
nightscout  |   type: 'heartbeat',
nightscout  |   sig: 'internal://heartbeat/1',
nightscout  |   beat: 1,
nightscout  |   interval: 60000,
nightscout  |   started: 2023-07-11T08:32:01.115Z
nightscout  | }
nightscout  | Load Complete:
nightscout  |    profiles:1
nightscout  | data loaded: reloading sandbox data and updating plugins
nightscout  | EVENTUALLY FOUND null
nightscout  | /opt/app/node_modules/nightscout-connect/lib/sources/glooko/index.js:85
nightscout  |       var last_mills = Math.max(two_days_ago, last_known.entries ? last_known.entries.getTime( ) : two_days_ago);

[bewest]

Yes, I think Sulka has some patches that help with this. last_known.entries and friends should be a date object or may be null. Apologies for this!

[bewest]

Glooko patches from Sulka have been integrated and released. Hope this helps!

[burnedikt]

Will check, thanks 🙏

[burnedikt]

Seems like this still happens with the latest version (0.10.0) of nightscout-connect:

EVENTUALLY FOUND null
(node:39418) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'entries' of null
    at Object.dataFromSesssion (/cgm-remote-monitor/node_modules/nightscout-connect/lib/sources/glooko/index.js:85:58)
    at dataFetchService (/cgm-remote-monitor/node_modules/nightscout-connect/lib/machines/fetch.js:8:19)
    at Interpreter._exec (/cgm-remote-monitor/node_modules/xstate/lib/interpreter.js:269:63)
    at Interpreter.exec (/cgm-remote-monitor/node_modules/xstate/lib/interpreter.js:1026:10)
    at Interpreter.execute (/cgm-remote-monitor/node_modules/xstate/lib/interpreter.js:387:14)
    at Interpreter.update (/cgm-remote-monitor/node_modules/xstate/lib/interpreter.js:415:12)
    at /cgm-remote-monitor/node_modules/xstate/lib/interpreter.js:110:15
    at Scheduler.process (/cgm-remote-monitor/node_modules/xstate/lib/scheduler.js:69:7)
    at Scheduler.schedule (/cgm-remote-monitor/node_modules/xstate/lib/scheduler.js:48:10)
    at Interpreter.send (/cgm-remote-monitor/node_modules/xstate/lib/interpreter.js:104:23)
    at _a.id (/cgm-remote-monitor/node_modules/xstate/lib/interpreter.js:1139:15)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)