1602756 - Prototype Rust API over FFI (for a-s)

Status: RESOLVED FIXED

(Data Platform and Tools :: Glean: SDK, enhancement, P1)

Description

[Jan-Erik Rediger [:janerik]]

With the Rust API changes accepted, I want to prototype that it actually works across the FFI boundary.

Comment 1

[Jan-Erik Rediger [:janerik]]

Managed to implement the demo thing as an android-components service, included in the glean-sample-app.

Code available in a branch: https://github.com/mozilla-mobile/android-components/compare/master...badboy:new-glean-api

Learnings:

• linking is hard
• calling cargo build inside a build.rs feels hacky, but it's not much different than invoking any other build system
  • advantage: the top-level cargo takes care of the dependency resolution (and download)
• We need a version check at runtime, to ensure a-s (or any other user) is using the version of Glean they expect
• We need a glean-sys, that runs bindgen over the (cbindgen-generated) headers and then a "nice Rust API" on top of that