Rust WASI Example

A toy program implementing HQ9+ to demo compiling Rust to WASI and running it with Wasmer.

Setting up

You will need the Rust toolchain installed.

First, let's clone the repo:

Ensure you have an up to date version of Rust and run:

Building

Running

Uploading to WAPM

Setting up wapm cli

To upload to WAPM we must first make an account:

1. Go to wapm.io
2. Create an account (sign up)
3. Log in with the wapm cli client

Setting up the project for wapm

To run the project with wapm we must create a wapm.toml manifest file to instruct wapm how to run the wasm binary.

Our wapm.toml contains 3 sections:

• [package] This is where the metadata about the package lives
• [[module]] This is where metadata about the module (wasm binary) lives
• [[command]] This is where we tell wapm how to run the module and what to call it

For more information about these sections see the documentation.

IMPORTANT: To publish the project to the wapm registry, you must change the namespace (the package.name field before the /) to match the username you made while signing up and that you are now logged in as (wapm whoami).

For your convenience, you may run the following snippet to edit it for you.

When making a new wapm project, this step is not necessary; the wapm init command creates a wapm.toml skeleton, with your name as the namespace, for you.

Running the project with wapm locally

Now that we're all set up, we can use wapm to run our wasm binary!

Uploading to WAPM

Now that we've set up wapm and verified that it works locally, we're ready to upload to the WAPM registry:

Running from WAPM