Parsing Resource Version Is Not Allowed

[stevekuznetsov]

Overview of the Issue

The Kubernetes API explicitly disallows parsing the metadata.resourceVersion field on an object as an integer. This project, however, does so as of this commit: cb0486e

During a review of code that would be affected by non-numerical resourceVersions, I came upon this code. I'm hoping to better understand what this codebase is using the parsing logic for and if there are other means to that end without using non-supported API behavior. I can see that uses of the parsing seem to all be in precondition functions passed to Upsert* methods on a store. This looks analogous to the resource version precondition provided by the Kubernetes API server, but the only implementation of the store I found was an in-memory one here - so I'm not entirely sure how the Kubernetes client and server get involved here.

[nathancoleman]

Hi @stevekuznetsov , thanks for reporting!

Personally, I wasn't aware of that note RE: metadata.resourceVersion. We're just parsing as an integer today to guard against incorrectly updating to an older version; however, it looks like the watcher probably handles that for us. If that's the case, we can just do an equality check as mentioned by the docs that you linked.

[stevekuznetsov]

Gotcha - if you could help me understand the in-memory storage you have and when/if/how it gets synced to a running k8s API server, I could help fix it!

[nathancoleman]

@andrewstucki provided some additional context over on my PR
#467 (comment)