fastlike

fastlike is a Go project that implements the Fastly Compute@Edge ABI using wasmtime and exposes a http.Handler for you to use.

There's a proxy implementation in cmd/fastlike which you can run with:

$ go run ./cmd/fastlike -wasm <wasmfile> -backend <proxy address>

You don't need the fastly CLI to build the test program either, as long as you have rust installed and the wasm32-wasi target available:

$ cd testdata; cargo build; cd ..
$ go run ./cmd/fastlike -wasm ./testdata/target/wasm32-wasi/debug/example.wasm -backend <proxy address>

However, the fastly cli will help you get your toolchains up to date.

For a more full-featured example:

# in one terminal:
$ cd testdata; fastly compute build; cd ..
$ go run ./cmd/fastlike -wasm ./testdata/bin/main.wasm -backend localhost:8000 -b localhost:5000

# in another
$ python3 -m http.server

# in a third
$ curl localhost:5000/testdata/src/main.rs

Go, running Rust, calling Go, proxying to Python.

TODO

• How to handle Go errors? We just panic.
• How to handle errors over the ABI? Just return the proper XQD status?
  • Maybe have Fastlike take a writer to send logs to, and abi methods can write warnings/errors there
• Implement the rest of the ABI