Swift FxAccountDeviceConstellation should notify when push endpoint is expired

[rfk]

The swift FxAccountDeviceConstellation currently logs and ignores the "your push endpoint has expired" flag set on its device record by the FxA server. It's important that the application be able to recovery from this state, otherwise send-tab will not work correctly.

@eoger what do you think about firing a notification event when we discover this, to allow the app to handle it?

As a first step, perhaps we can have the app log an error to sentry or submit telemetry when it receives this notification.

┆Issue is synchronized with this Jira Task
┆Epic: Trusted Send Tab Telemetry
┆Sprint: SYNC - end 2020-07-03

[eoger]

Yes I think it is a good idea, do we know how often we get a pushEndpointExpired on iOS in practice though?

[lougeniaC64]

@eoger @rfk Assuming this should stay in the backlog in the send tab epic?

[rfk]

Assuming this should stay in the backlog in the send tab epic?

Yep, sounds good.

[mhammond]

Yes I think it is a good idea, do we know how often we get a pushEndpointExpired on iOS in practice though?

I had the same question for desktop and Ryan said that, basically, it should never expire - except when it does :) We don't know what the mean time is for expiry, but there's no "expected" time.

[eoger]

We settled on: "let's log an error on Sentry"

[eoger]

We settled on: "let's log an error on Sentry"

I ended up just re-registering when we see the flag, it was fairly easy actually.