Question - Adding Support for Readthrough Cache? (specifically "Customizing Cache Behavior")

[aturingmachine]

Apologies if this has already been answered somewhere, I have scoured through the issues and PRs here to try and find an answer before opening this.

I see there is support for the Simple and Core Cache being added to Viceroy (which looks like a pretty big undertaking). However I am curious if there are plans to implement support for the Readthrough Cache in some manner. Specifically I am attempting to write Integration Tests for a Compute application (Rust compiling to WASM), and need to make use of the set_before_send and set_after_send to satisfy some of our business logic.

So I suppose my question would be, are there plans to implement the Readthrough Cache or does anyone have any workarounds for the time being?

[PaulRudin]

Yeah, it's currently a bit of a pain with code that uses the http cache api. You can detect if you're running under viceroy since the env var FASTLY_HOSTNAME is "localhost" in this case. And then just have different code paths. But it's a bit kludgy because then you're not exercising some of the code that you want to run when actually deployed.