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wasi.rs
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wasi.rs
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//! Running a WASI compiled WebAssembly module with Wasmer.
//!
//! This example illustrates how to run WASI modules with
//! Wasmer.
//!
//! If you need more manual control over the instantiation, including custom
//! imports, then check out the ./wasi_manual_setup.rs example.
//!
//! You can run the example directly by executing in Wasmer root:
//!
//! ```shell
//! cargo run --example wasi --release --features "cranelift,wasi"
//! ```
//!
//! Ready?
use std::io::Read;
use wasmer::{Module, Store};
use wasmer_wasix::{Pipe, WasiEnv};
fn main() -> Result<(), Box<dyn std::error::Error>> {
let wasm_path = concat!(
env!("CARGO_MANIFEST_DIR"),
"/tests/wasi-wast/wasi/unstable/hello.wasm"
);
// Let's declare the Wasm module with the text representation.
let wasm_bytes = std::fs::read(wasm_path)?;
// Create a Store.
let mut store = Store::default();
println!("Compiling module...");
// Let's compile the Wasm module.
let module = Module::new(&store, wasm_bytes)?;
let (stdout_tx, mut stdout_rx) = Pipe::channel();
// Run the module.
WasiEnv::builder("hello")
// .args(&["world"])
// .env("KEY", "Value")
.stdout(Box::new(stdout_tx))
.run_with_store(module, &mut store)?;
eprintln!("Run complete - reading output");
let mut buf = String::new();
stdout_rx.read_to_string(&mut buf).unwrap();
eprintln!("Output: {buf}");
Ok(())
}
#[test]
#[cfg(feature = "wasi")]
fn test_wasi() -> Result<(), Box<dyn std::error::Error>> {
main()
}