notification for entering and exiting offline mode

[michaelAtCoalesce]

Operating System

Mac OS X

Browser Version

web and node sdk's

Firebase SDK Version

10.1.0

Firebase SDK Product:

Firestore

Describe your project's tooling

we use both firebase-js web-sdk and firebase node admin sdk.

Describe the problem

we are investigating some situations recently where firestore will say that it is in offline mode , and also, some situations where simple get() calls are returning data from the cache, instead of live data from the server

is there a way to get a callback when firestore either enters or exists an offline mode? we seem to get this on issuing a get(),
@firebase/firestore: Firestore (10.1.0): Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds. FirebaseError: [code=unavailable]: Failed to get document because the client is offline.

or sometimes we will get cached data when doing a get() on a document, and instead of finding out on the action, it would be helpful to get a notification that we've entered an offline mode for our observability purposes.

Steps and code to reproduce issue

recently, firestore appears to be getting transient connectivity issues.

[cherylEnkidu]

Hi @michaelAtCoalesce ,

Unfortunately SDK cannot tell the transient internet connectivity. You can choose to ignore the getDoc data when it is from cache, or force getDoc to fetch from server.

[michaelAtCoalesce]

this is a feature request. we are seeing connectivity errors and this would help understand when they are happening

[cherylEnkidu]

Hi @michaelAtCoalesce ,

Sorry unfortunately from the SDK perspective, it doesn't have enough context to tell the transient internet availability. Thank you for your understanding.