This is a test harness for prototyping support for wasi-sockets in the Rust std library and wasi-libc.

Note that you can already use wasi-sockets by calling host functions directly from C, Rust, Python, and other languages with Component Model support. What's missing as of this writing is standard library support for those languages, which is what this repository is intended to exercise as progress is made.

• server: test host using wasmtime and wasmtime-wasi to provide a host environment
• client: Rust test guest using wasi-sockets host functions directly
• client-std: Rust test guest using std::net. Note that, as of this writing, tests using this guest will fail unless you use forks of Rust, wasi-libc, and the WASI Preview 1 adapter as described below.
• client-tokio: Rust test guest using tokio::net. As with client-std, you'll need to use the forks discussed below.
• client-tokio-postgres: Rust test guest using tokio-postgres on top of tokio::net. As with client-std, you'll need to use the forks discussed below.
• client-python: Python test using asyncio, built as a component by componentize-py

• Unix-style host (e.g. Linux, MacOS, Mingw, WSL2)
• CMake
• Clang
• Ninja
• Python
• Rust (with the wasm32-wasi and wasm32-unknown-unknown targets installed)

In the commands that follow, replace aarch64-apple-darwin with your host platform's target triple.

Note that cloning the llvm-project submodule of wasi-sdk and the rust repo may both take a long time.

TODO: The following will build LLVM twice, which is annoying. Can we avoid that?

TODO #2: Can we speed up the Rust build by excluding tools we don't need?

git submodule update --init --recursive
git clone https://github.com/dicej/wasi-sdk -b sockets
cd wasi-sdk
git submodule update --init --recursive
make build/libcxx.BUILT
# temporary, until we have a real `wasm32-wasi-preview2` target:
for x in include share lib; do \
    mv build/install/opt/wasi-sdk/share/wasi-sysroot/$x/wasm32-wasi \
        build/install/opt/wasi-sdk/share/wasi-sysroot/$x/wasm32-wasi-preview1 && \
    mv build/install/opt/wasi-sdk/share/wasi-sysroot/$x/wasm32-wasi-preview2 \
        build/install/opt/wasi-sdk/share/wasi-sysroot/$x/wasm32-wasi; \
done
export WASI_SDK_SYSROOT=$(pwd)/build/install/opt/wasi-sdk/share/wasi-sysroot
cd ..
git clone https://github.com/dicej/rust -b sockets
cd rust
./configure \
    --target=wasm32-wasi,wasm32-unknown-unknown,aarch64-apple-darwin \
    --set=target.wasm32-wasi.wasi-root=$WASI_SDK_SYSROOT \
    --enable-lld
./x.py build --stage 1
rustup toolchain link wasi-sockets build/host/stage1
export WASI_SOCKETS_TESTS_TOOLCHAIN=wasi-sockets
cd ..
git clone https://github.com/dicej/wasmtime -b adapter-open-badfd
cd wasmtime
git submodule update --init --recursive
bash ci/build-wasi-preview1-component-adapter.sh
export WASI_SOCKETS_TESTS_ADAPTER=$(pwd)/target/wasm32-unknown-unknown/release/wasi_snapshot_preview1.command.wasm
cd ..

Once the above is complete, you can switch to the server directory in your clone of this repo and run the tests:

cd server
cargo test --release

All tests should pass. If they don't, please open an issue on this repo.