b0939f6626
* Remove explicit `S` type parameters This commit removes the explicit `S` type parameter on `Func::typed` and `Instance::get_typed_func`. Historical versions of Rust required that this be a type parameter but recent rustcs support a mixture of explicit type parameters and `impl Trait`. This removes, at callsites, a superfluous `, _` argument which otherwise never needs specification. * Fix mdbook examples
87 lines
2.9 KiB
Rust
87 lines
2.9 KiB
Rust
use anyhow::Context;
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use std::path::Path;
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use wasi_common::pipe::WritePipe;
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use wasmtime::{Engine, Linker, Module, Store};
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use wasmtime_wasi::sync::{add_to_linker, WasiCtxBuilder};
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pub fn instantiate(data: &[u8], bin_name: &str, workspace: Option<&Path>) -> anyhow::Result<()> {
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run(data, bin_name, workspace, false)
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}
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pub fn instantiate_inherit_stdio(
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data: &[u8],
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bin_name: &str,
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workspace: Option<&Path>,
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) -> anyhow::Result<()> {
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run(data, bin_name, workspace, true)
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}
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fn run(
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data: &[u8],
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bin_name: &str,
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workspace: Option<&Path>,
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inherit_stdio: bool,
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) -> anyhow::Result<()> {
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let stdout = WritePipe::new_in_memory();
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let stderr = WritePipe::new_in_memory();
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let r = {
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let engine = Engine::default();
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let module = Module::new(&engine, &data).context("failed to create wasm module")?;
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let mut linker = Linker::new(&engine);
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add_to_linker(&mut linker, |cx| cx)?;
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// Create our wasi context.
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// Additionally register any preopened directories if we have them.
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let mut builder = WasiCtxBuilder::new();
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if inherit_stdio {
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builder = builder.inherit_stdio();
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} else {
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builder = builder
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.stdout(Box::new(stdout.clone()))
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.stderr(Box::new(stderr.clone()));
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}
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builder = builder.arg(bin_name)?.arg(".")?;
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if let Some(workspace) = workspace {
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println!("preopen: {:?}", workspace);
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let preopen_dir =
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cap_std::fs::Dir::open_ambient_dir(workspace, cap_std::ambient_authority())?;
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builder = builder.preopened_dir(preopen_dir, ".")?;
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}
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for (var, val) in super::test_suite_environment() {
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builder = builder.env(var, val)?;
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}
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// cap-std-sync does not yet support the sync family of fdflags
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builder = builder.env("NO_FDFLAGS_SYNC_SUPPORT", "1")?;
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let mut store = Store::new(&engine, builder.build());
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let instance = linker.instantiate(&mut store, &module)?;
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let start = instance.get_typed_func::<(), ()>(&mut store, "_start")?;
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start.call(&mut store, ()).map_err(anyhow::Error::from)
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};
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match r {
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Ok(()) => Ok(()),
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Err(trap) => {
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let stdout = stdout
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.try_into_inner()
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.expect("sole ref to stdout")
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.into_inner();
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if !stdout.is_empty() {
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println!("guest stdout:\n{}\n===", String::from_utf8_lossy(&stdout));
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}
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let stderr = stderr
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.try_into_inner()
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.expect("sole ref to stderr")
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.into_inner();
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if !stderr.is_empty() {
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println!("guest stderr:\n{}\n===", String::from_utf8_lossy(&stderr));
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}
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Err(trap.context(format!("error while testing Wasm module '{}'", bin_name,)))
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}
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}
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}
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