Store and update config metadata entries by namespace

[karenyz]

Currently fetch/activation of different namespaces will modify a shared set of metadata, however fields such as fetch_time, last_apply_time should be namespace-specific

Fixes#7179

[charlotteliang]

I was under the impression that the namespace API is deprecated in 3P concept. Do we know what are the use case or currently we are actually fetching per namespace and previous eng didn't manage to implement that in database?

[paulb777]

• @visumickey For input on addressing Performance's namespace needs.

[karenyz]

I was under the impression that the namespace API is deprecated in 3P concept. Do we know what are the use case or currently we are actually fetching per namespace and previous eng didn't manage to implement that in database?

@chliangGoogle The use case is that Performance uses the namespace fireperf(initialized here), and calls fetchAndActivate independently of whether the developer uses RC. This should not affect the activation of the firebase template.

However right now activating fireperf will update the shared metadata(including last_apply_time) and this impacts activation of the firebase namespace ( based on last_apply_time it looks like the template has already been activated)

[paulb777]

Should we consider migrating to a more flexible storage mechanism like GULUserDefaults? @chliangGoogle Do you know why sqlite was chosen to be used?

[charlotteliang]

No particular reason using sqlite tbh, and I think it might be easier for @karenyz to migrate to GULUserDefaults with the new metadata design.

[google-oss-bot]

Coverage Report

Affected SDKs

• FirebaseRemoteConfig-iOS-FirebaseRemoteConfig.framework

  SDK overall coverage changed from 80.97% (144f23e) to 80.94% (cada4b2) by -0.02%.

  Filename	Base (144f23e)	Head (cada4b2)	Diff
  RCNConfigDBManager.m	77.94%	77.99%	+0.05%
  RCNConfigSettings.m	70.24%	70.14%	-0.09%

Test Logs

• Base (144f23e3): https://github.com/firebase/firebase-ios-sdk/actions/runs/579533627
• Head (cada4b2e): https://github.com/firebase/firebase-ios-sdk/actions/runs/582501503

[charlotteliang]

Awesome. Thanks for doing this!