This is a very simple experiment using WASI and various guest modules built in Go, Rust, and Zig

There is a go runtime (wazero) that can run all the guest modules

There is a simple hello-world style Rust host (wasmer)

There are three examples with various levels of features (go with the most):

* go-guest-example
* rust-guest-example
* zig-guest-example

Lessons learned

• gRPC was difficult to get working so opted for karmem instead - karmem is pretty obscure would be better to use something more mainstream
• A generator style approach like go-plugin would be more appropriate as its difficult to maintain the interfaces
• WASM only supports ints so you need to move around a lot of bytes to interact between the host and guest
• Error handling is implemented very naively, errors just cause panics

Requirements

• Rust
• Just
• Go 1.21
• Tinygo
• Zig

Usage

You can run all the commands using Just:

just --list
    build_go_example
    build_rust_example
    build_zig_example
    run_go_example
    run_rust_example
    run_rust_host
    run_zig_example