Comment by jamilbk

The article provides a very detailed exploration of all of the fun challenges you can face designing FFIs with Rust, but there's a good chance you can "get away" with simpler approaches if you think ahead a bit.

In our case, we call into Rust from Kotlin using JNI [0] and Swift using swift-bridge [1]. Thankfully our use case for the FFI [2] is for non-performance-critical calls and the data structures are fairly simple, so we just serialize objects with JSON.

No major issues so far.

One thing I am surprised hasn't been mentioned so far is Mozilla's UniFFI [3] which seems to solve some of the issues brought up in the article. We plan to switch to that once our FFI requirements become more complex.

[0] https://docs.rs/jni/latest/jni/

[1] https://github.com/chinedufn/swift-bridge

[2] https://www.firezone.dev/kb/architecture/tech-stack#client-a...

[3] https://github.com/mozilla/uniffi-rs