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fixes to example

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This commit is contained in:
Pat Hickey
2021-05-06 14:27:28 -07:00
parent e50f1b24a9
commit b0335d3ddf
1 changed files with 5 additions and 3 deletions
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8
examples/tokio/main.rs
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@@ -79,6 +79,10 @@ impl Inputs {
fn run_wasm(inputs: Inputs) -> impl Future<Output = Result<(), Error>> { fn run_wasm(inputs: Inputs) -> impl Future<Output = Result<(), Error>> {
use std::pin::Pin; use std::pin::Pin;
use std::task::{Context, Poll}; use std::task::{Context, Poll};
// IMPORTANT: The current wasmtime API is very challenging to use safely
// on an async runtime. This RFC describes a redesign of the API that will
// resolve these safety issues:
// https://github.com/alexcrichton/rfcs-2/blob/new-api/accepted/new-api.md
// This is a "marker type future" which simply wraps some other future and // This is a "marker type future" which simply wraps some other future and
// the only purpose it serves is to forward the implementation of `Future` // the only purpose it serves is to forward the implementation of `Future`
@@ -151,10 +155,8 @@ async fn _run_wasm(inputs: Inputs) -> Result<(), Error> {
// Instantiate // Instantiate
let instance = linker.instantiate_async(&inputs.env.module).await?; let instance = linker.instantiate_async(&inputs.env.module).await?;
instance instance
.get_export("_start") .get_typed_func("_start")
.ok_or_else(|| anyhow!("wasm is a wasi command with export _start"))? .ok_or_else(|| anyhow!("wasm is a wasi command with export _start"))?
.into_func()
.ok_or_else(|| anyhow!("_start is a func"))?
.call_async(&[]) .call_async(&[])
.await?; .await?;