Project temporarily archived: currently swiftwasm suffers from stability issues We are going to archive this project until these issues are solved

swift-wasm-runner

This is a simple Wasm runner built on top of Wasmtime. It behaves exactly like the wasmtime and the wasmer cli tools.

It has been built to allow unit testing of Kubewarden policies written using the Swift programming language.

Why?

The Kubewarden policies written using Swift leverage the policy-sdk-swift library, which depends on the wapc-guest-swift library.

The Wasm modules built will then import a series of waPC related functions. These functions must be provided by the Wasm host when the unit tests are run. This causes tools like wasmer and wasmtime to fail at runtime due to the unresolved imports.

This project provides a a simple Wasm host that can satisfy these function import requirements.

How it works

This project provides a simple Wasm host built on top of Wasmtime that load and evaluate a Wasm module.

The WASI snapshot 1 and the waPC functions are made available to the Wasm module. The waPC ones are simple mocks that do not perform anything real. This is good enough for running the unit tests of a Kubewarden policy.

The Wasm module has access only to the STDOUT and STDERR of the host.

How to use it

Kubewarden Swift policies provide a Makefile target that runs the unit tests inside of a container image.

This repository provides a container image that is based on the ghcr.io/swiftwasm/swiftwasm-action:5.3 one, but includes the swift-policy-runner instead of the default wasmer binary.

Nothing has to be done if you created your Kubewarden Swift policy starting from our template.