target wasm & wasi too

[ctaggart]

I think it is an important use case to be able to target wasm & wasi with these crates. We will need to add these targets to CI:

rustup target add wasm32-unknown-unknown
rustup target add wasm32-wasi

I'm hoping we can get the right features in place to support this. An important part of this is being able to use a different http client like reqwest instead of hyper. The http client abstraction is #36.

[ctaggart]

tokio does not yet work with WebAssembly tokio-rs/tokio#1597. reqwest is tokio based. surf has a wasm-client feature, but I was not able to get this to compile for wasi because of dependencies http-rs/surf#301:

use async_executor::{Executor, Task};
use futures_lite::future;
use surf::Result;

fn main() -> Result<()> {
    let ex = Executor::new();
    let task: Task<Result<()>> = ex.spawn(async {
        let ip = surf::get("http://ip.jsontest.com/").await?.body_string().await?;
        println!("ip {}", &ip);
        Ok(())
    });
    future::block_on(ex.run(task))
}

[radu-matei]

Hi!
I've been working towards compiling this (or rather parts of this) library to wasm32-wasi so the SDK can be used from WASI modules. It is built on top of the experimental HTTP library for WASI (and Wasmtime).

Here is the very early fork , currently with support only for the blob storage SDK, with a samples repo here.

I'll update this issue as I work on it, but as everything is experimental, I don't expect to propose a PR here anytime soon. This is in case interested people want to follow the work.

Thanks!

[radu-matei]

And here is how we are using the SDK from within WASI modules - https://github.com/deislabs/wagi-azure-samples

[ctaggart]

@radu-matei, this looks amazing! I look forward to trying it out once I have time.

[ctaggart]

@radu-matei, thanks for the blog post!
Using Azure services from WebAssembly modules
https://deislabs.io/posts/using-azure-services-wasi/

[thangchung]

That's cool. Just have a look at the repo at https://github.com/deislabs/wagi-azure-samples. But there are a lot of works to make it runs well with other Rust libs out there, almost based on tokio-rs which couldn't run on WASM right now

[cataggar]

#939 adds a wasm target, which was the goal of this issue. There is more work to be done to support it, but it is progress.