x/pkgsite: invalidate cache for pkg.go.dev/<import-path> when a new latest version is available

[myitcv]

What is the URL of the page with the issue?

https://pkg.go.dev/github.com/sethvargo/go-githubactions?tab=doc

What is your user agent?

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.66 Safari/537.36

Screenshot

What did you do?

Visited the above URL, shortly after v0.1.1 was released (at the time the screenshot was taken: 2020-02-04 21.02.48 UTC)

What did you expect to see?

Refreshing the page to take me to the latest version. v0.1.1.

What did you see instead?

I was left on the v0.1.0 page with a red link (shown in the screenshot) that prompted me to click through for the latest version.

To my mind the latest version should always be shown for the bare, non-canonical URL.

The red "latest" link should then show on the canonical version pages that are not the latest version. e.g.

https://pkg.go.dev/github.com/sethvargo/go-githubactions@v0.1.0?tab=doc

Related to #36807

[julieqiu]

https://pkg.go.dev/github.com/sethvargo/go-githubactions?tab=doc shows v0.1.1 for me:

@myitcv would you mind confirming if this is still an issue?

[myitcv]

https://pkg.go.dev/github.com/sethvargo/go-githubactions?tab=doc showed v0.1.1 for me at the time of submitting this issue. The bug to my mind is that immediately after v0.1.1 was released, https://pkg.go.dev/github.com/sethvargo/go-githubactions?tab=doc showed v0.1.0 with a link to "show latest". As soon as pkg.go.dev spots the latest version, it should ensure that https://pkg.go.dev/github.com/sethvargo/go-githubactions?tab=doc shows that latest version.

[julieqiu]

Got it, thanks for clarifying. This sounds like an issue with improving our cache expiration logic. At the moment, the latest version of a package is cached for 10 minutes.